View source for L-PI-20-016, Enclosure 2 - Prairie Island Updated Safety Analysis Report, Revision 36, Section 8 - Section 11

{{Adams
| number = ML20118D373
| issue date = 04/27/2020
| title = Enclosure 2 - Prairie Island Updated Safety Analysis Report, Revision 36, Section 8 - Section 11
| author name = 
| author affiliation = Xcel Energy, Northern States Power Co
| addressee name = 
| addressee affiliation = NRC/NRR
| docket = 05000282, 05000306
| license number = DPR-042, DPR-060
| contact person = 
| case reference number = L-PI-20-016
| package number = MML20118D173
| document type = Updated Final Safety Analysis Report (UFSAR)
| page count = 469
}}

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{{#Wiki_filter:PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page i SECTION 8 PLANT ELECTRICAL SYSTEMS TABLE OF CONTENTS Page 8.1   

==SUMMARY==
 ..............................................................................................8.1-1 8.2   TRANSMISSION SYSTEM .....................................................................8.2-1 8.2.1   Offsite Transmission Grid Configuration ..................................8.2-1 8.2.2   Offsite Grid Reliability ...............................................................8.2-1 8.2.3   Protection and Control for Interconnections .............................8.2-4 8.2.4   Onsite Interconnections ...........................................................8.2-5 8.3   AUXILIARY POWER SYSTEM ...............................................................8.3-1 8.3.1   Design Basis ............................................................................8.3-1 8.3.2   Description ...............................................................................8.3-1 8.3.3   Performance Analysis ..............................................................8.3-3 8.4   PLANT STANDBY DIESEL GENERATOR SYSTEMS ...........................8.4-1 8.4.1   Design Basis ............................................................................8.4-1 8.4.2   Description ...............................................................................8.4-2 8.4.3   Performance Analysis: Loss-of-Coolant Accident and Loss of Offsite Power............................................................................8.4-10 8.4.4   Station Blackout .......................................................................8.4-11 8.4.5   Non-Safeguards Standby Diesel Generators ...........................8.4-12 8.5   DC POWER SUPPLY SYSTEMS ...........................................................8.5-1 8.5.1   Safeguards 125 Volt DC System ..............................................8.5-1 8.5.2   Safeguards Batteries ................................................................8.5-1 8.5.3   Safeguards Battery Chargers ...................................................8.5-2 8.5.4   Safeguards Distribution Equipment ..........................................8.5-3 8.5.5   Instrumentation, Controls, and Alarms .....................................8.5-3 8.5.6   Battery Room Special Exhaust Fans ........................................8.5-4 8.5.7   Inspection and Testing .............................................................8.5-4 8.6   INSTRUMENTATION AND CONTROL AC POWER SUPPLY SYSTEMS ................................................................................8.6-1

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page ii 8.7   CABLES AND RACEWAYS ....................................................................8.7-1 8.7.1  Cable Derating .........................................................................8.7-1 8.7.2  Cable Routing ..........................................................................8.7-2 8.7.3  Cable Tray Sharing ..................................................................8.7-4 8.7.4  Fire Protection ..........................................................................8.7-4 8.7.5  Cable and Cable Tray Markings ...............................................8.7-4 8.7.6  Relay Room Arrangement ........................................................8.7-6 8.7.7  Panel Wiring Separation ..........................................................8.7-6 8.7.8  Electrical Penetrations .............................................................8.7-7 8.7.9  Annulus Cable Supports ..........................................................8.7-8 8.8   INSPECTION AND TESTING .................................................................8.8-1 8.9   ENVIRONMENTAL QUALIFICATION OF SAFETY-RELATED ELECTRICAL EQUIPMENT ....................................................................8.9-1 8.10  POWER OPERATED VALVES ...............................................................8.10-1 8.10.1 Motor Operated Valves ............................................................8.10-1 8.10.2 Generic Letter 95-07, Pressure Locking and Thermal Binding of Safety Related Power-Operated Valves..............................8.10-1 8.11  REFERENCES........................................................................................8.11-1

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page iii TABLE OF CONTENTS [Continued]
LIST OF TABLES TABLE 8.4-1 DELETED TABLE 8.4-2 DELETED TABLE 8.4-3 DELETED TABLE 8.4-4 DELETED TABLE 8.5-1 DELETED TABLE 8.5-2 DELETED

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page iv TABLE OF CONTENTS [Continued]
LIST OF FIGURES FIGURE 8.2-1  DELETED FIGURE 8.2-2  PRAIRIE ISLAND SUBSTATION OPERATING DIAGRAM FIGURE 8.2-3  SITE ARRANGEMENT OF TRANSMISSION LINES AND UNDERGROUND CABLES FIGURE 8.3-1  SAFEGUARDS CONSOLIDATED CIRCUIT DIAGRAM FIGURE 8.5-1A 125 VDC & 120 VAC INSTRUMENT SUPPLY - UNIT 1 - TRAIN A FIGURE 8.5-1B 125 VDC & 120 VAC INSTRUMENT SUPPLY - UNIT 1 - TRAIN B FIGURE 8.5-2A 125 VDC & 120 VAC INSTRUMENT SUPPLY - UNIT 2 - TRAIN A FIGURE 8.5-2B 125 VDC & 120 VAC INSTRUMENT SUPPLY - UNIT 2 - TRAIN B FIGURE 8.8-1  DIESEL RELIABILITY STARTS/STOPS

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.1-1 SECTION 8 PLANT ELECTRICAL SYSTEMS 8.1      

==SUMMARY==

Each main generator feeds electrical power at 20 KV through its isolated phase bus to the associated Generator Step Up Transformer. The power requirements for station and unit auxiliaries are supplied by a Main Auxiliary Transformer connected to the isolated phase bus, following practices that have been highly satisfactory for fossil-fueled and other nuclear units. Auxiliary power for startup, shutdown and normal backup is supplied from Reserve Auxiliary Transformers designated 1R and 2RS.
Transformer 1R is the normal backup source for Unit 1 and is connected to the 161kV external power system. Transformer 2RS is the normal backup source for Unit 2 and is connected to the 345kV external power system. Bus ties are provided to allow crossfeeding should one transformer be out of service. Redundant offsite power sources are provided of sufficient capacity to supply all critical loads for either or both units. Each Safeguards bus has a preferred and alternate offsite source consisting of a Reserve Auxiliary Transformer and a Cooling Tower Substation Transformer, respectively. The Cooling Tower Substation sources are not large enough to also serve as a redundant startup source. Emergency backup power, to ensure continuity of supply for critical loads, is supplied from four onsite, quick-start Emergency Diesel Generators.
The function of the Auxiliary Electrical System is to provide reliable power to those auxiliaries required during any normal or emergency mode of plant operation.
The design of the system is such that sufficient independence or isolation between the various sources of electrical power is provided in order to guard against concurrent loss of all auxiliary power.
GDC 2 - Performance Standards Those systems and components of reactor facilities which are essential to the prevention or to the mitigation of the consequences of nuclear accidents which could cause undue risk to the health and safety of the public shall be designed, fabricated, and erected to performance standards that will enable such systems and components to withstand, without undue risk to the health and safety of the public, the forces that might reasonably be imposed by the occurrence of an extraordinary natural phenomenon such as earthquake, tornado, flooding condition, high wind or heavy ice. The design bases so established shall reflect: (a) appropriate consideration of the most severe of these natural phenomena that have been officially recorded for the site and the surrounding area and (b) an appropriate margin for withstanding forces greater than those recorded to reflect uncertainties about the historical data and their suitability as a basis for design.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.1-2 To satisfy GDC 2, all electrical systems and components vital to plant safety, including the Emergency Diesel Generators, are designed as Class I systems so that their integrity is not impaired by the Design Basis Earthquake, wind, storms, floods, or disturbances to the external electrical system. Power, control and instrument cabling, motors and other electrical equipment required for operation of the engineered safety features are suitably protected against the effects of either a Design Basis Accident, or of severe external environmental phenomena in order to assure a high degree of confidence in the operability of such components in the event their use is required.
GDC 39 - Emergency Power for Engineered Safety Features An emergency power source shall be provided and designed with adequate independency, redundancy, capacity, and testability to permit the functioning of the engineered safety features and protection systems required to avoid undue risk to the health and safety of the public. This power source shall provide this capacity assuming a failure of a single active component.
To satisfy GDC 39, independent alternate power systems are provided with adequate capacity and testability to supply the required engineered safety features and protection systems.
The plant is supplied with normal, standby, and emergency power sources as follows:
: a. The main source of auxiliary power during operation of either Unit is the Units generator. Power is supplied via the Main Auxiliary Transformer that is connected to the main leads of the generator.
: b. Standby power required during startup, shutdown, and after reactor trip of either Unit is supplied from the Northern States Power Companys 161 KV and 345 KV transmission systems, via the plant substation through two independent connections from the substation to the plant.
: c. Two emergency diesel generator sets dedicated to each Unit are connected to the engineered safety features (safeguards) buses to supply shutdown power in the event of loss of all other AC auxiliary power.
: d. Emergency power for vital instruments and controls for each Unit is supplied 01471873 from two 125 VDC systems for each unit.
The Emergency Diesel Generators are connected to the separate 4160 volt auxiliary system buses in each Unit. Each set is started automatically on a safety injection signal from its Unit or upon the occurrence of undervoltage on its corresponding 4160 volt bus.
The Emergency Diesel Generator arrangement provides adequate capacity to supply the engineered safety features for the Design Basis Accident in one Unit, assuming the failure of a single active component in the system.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.1-3 GDC 24 - Emergency Power for Protection Systems In the event of loss of all offsite power, sufficient alternate sources of power shall be provided to permit the required functioning of the protection systems.
To satisfy GDC 24, the facility is supplied with normal, reserve, and emergency power to provide for the required functioning of the protection systems.
In the event of a Loss of Coolant Accident (LOCA) coincident with the Loss of Offsite Power (LOOP) event, emergency power is available from two Emergency Diesel Generators dedicated to each unit.
The instrumentation and controls portions of the protection systems will be supplied from the 125 VDC systems during the diesel startup period.

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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.2-1 8.2       TRANSMISSION SYSTEM 8.2.1      Offsite Transmission Grid Configuration The output of the Prairie Island Generating Plant is delivered to a 345/161 KV Substation located at the plant site. Electrical energy generated at 20 KV is transformed to 345 KV by the Generator Step Up Transformers. A one-line diagram of the 345 KV connections for Units No. 1 and 2 is shown in Figure 8.2-2.
There are five transmission lines that connect the Prairie Island Plant to the transmission system. Two of the 345 KV transmission lines are connected directly to the Red Rock Substation and a third 345 KV transmission line is connected to the Hampton Substation. The Red Rock and Hampton Substations are connected to the Minneapolis, St Paul area high voltage grid. A fourth 345 KV transmission line is connected to the North Rochester Substation in southern Minnesota and from there, the line proceeds to the Bryon and Adams Substations and then through Iowa to Missouri where it is tapped several times to major Substations.
The basic scheme used in the 345 KV portion of the Substation is the breaker-and-one-half system.
The 161 KV portion of the Substation is a single bus arrangement. The 161 KV Substation is connected to 345 KV Bus 2 by 345/161/13.8KV No. 10 Transformer. The fifth transmission line is a 161 KV line which connects to the Spring Creek Substation and then supplies power to the Red Wing, Minnesota area.
Figure 8.2-3 shows the site arrangement of transmission lines and underground power cables. A single line diagram for the Cooling Tower and Plant (345/161KV) Substation is included on Figure 8.2-2. The criteria for spacing between lines are based on national standards for such lines.
8.2.2      Offsite Grid Reliability Reliability considerations to minimize the probability of power failure due to faults in the network interconnections and the associated switching are as follows:
: a. Redundancy is designed into the network interconnections for the units by having four transmission circuits into the 345 KV system and one transmission circuit into the 161 KV system. These systems are interconnected at the site and any one 345 KV circuit is capable of providing the full power requirements for the startup or shutdown of either Unit.
: b. Physical separation of transmission lines is maintained on site as much as possible to provide isolation. The transmission line spacing in the vicinity of the site is greater than the height of the towers.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.2-2
: c. Transmission line design for lightning performance is based on less than one outage per 100 miles per year.
: d. The substation switching arrangement provides nine 345 KV circuit breakers for six transmission line/generator outlets. This type of design is referred to as a breaker-and-one-half design, and includes two full capacity main buses.
Dual simultaneous relay protection is provided for each bus and line/outlet.
Breaker failure relaying protects for scenarios where the interrupting device fails to clear a fault.
Operating characteristics of this design include:
: 1. Any transmission line/outlet may be switched open under normal or fault conditions without interrupting another line/outlet.
: 2. Any single circuit breaker or bus may be isolated for maintenance without interrupting power or protection to any line/outlet.
: 3. Short circuits on a single main bus are isolated without interrupting service to any line/outlet.
: 4. Failure of a bus side breaker will result in the loss of only one line/outlet until the failed component is isolated.
: 5. Dual simultaneous relay protection provides coverage for failure of one set of protective relaying.
: e. Design and construction of the 345 KV and 161 KV transmission lines exceed the requirements of the National Electrical Safety Code for heavy loading districts, Grade B construction.
With the above features, the probability of loss of more than one source of auxiliary power from credible faults is low, however, in the event of an occurrence causing loss of all the 345-KV and 161-KV connections, power for essential service is supplied from four onsite emergency diesel generators.
In the event that both Prairie Island Units trip simultaneously, the offsite supply to the safety features system would not be interrupted. The breaker-and-one-half design is such that the two unit trip event does not isolate auxiliary power supply points from the transmission lines serving the substation.
The adequacy of offsite power supply to the auxiliary safety sources in the event of a two unit trip is discussed below.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.2-3 Voltage supplied to auxiliary systems from offsite sources after a two unit trip depends on many variables. The direction and magnitude of power flows due to system load, power transactions and pattern of on-line generation play a large role in post-trip voltage.
Studies using normal peak-load system steady state load-flow simulation show that loss of the maximum generation from Prairie Island (a 2-unit trip) can be sustained with adequate voltage. Offsite sources to auxiliary systems are not interrupted, and provide proper voltage to the safety equipment.
Key to this contingent performance ability are the spinning and standby reserves maintained by NSP and other MidContinent Area Power Pool (MAPP) member utilities.
These reserves total in excess of 15% of the MAPP peak load. (For example 1990 MAPP operating reserves totaled 3529 MW).
Contingent support immediately after loss of the Prairie Island Units is supplied by rotor inertia and governor action of other generating units throughout the interconnected eastern two-thirds of the United States and the eastern half of southern Canada. NSP derives this support over transmission tie-lines with capacity exceeding 3000 MW. After several minutes the MAPP spinning and standby reserve capability replaces the import from the interconnected systems.
No customer load interruption or break-up of NSPs transmission system is anticipated as a result of a Prairie Island two unit trip. The offsite supplies to the plant safety features therefore continue to operate without interruption.
Backup systems are in place to cover contingent system conditions which may exist prior to a two unit trip. An underfrequency load shed system is in use by all MAPP member utilities which would shed approximately 10% of the system load at each of three frequencies: 59.3 Hz, 59.0 Hz and 58.7 Hz. This shed of 30% of load is intended to restore a balance between load and generation and return system frequency to a proper level.
NSP has also installed an under-voltage tripping system to cover the multiple contingency events which could pose the threat of system voltage collapse. In the scenario of several prior contingencies, and a subsequent Prairie Island two unit trip, the adequacy of 345-KV offsite voltage source to plant auxiliary system is protected by automatic load shedding. This is intended to restore system voltage to a proper level.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.2-4 Simulation of Prairie Island two unit trip event is performed using computer load flow models. NSP uses two types of load flow programs, one for modeled studies, and a second for analysis of real-time system conditions using telemetered voltage and power flow data. The computer models are representations of the transmission system electrical characteristics and components. Accuracy of the models are periodically verified by comparison with actual historical data. Further studies are performed to examine details of the dynamic conditions after the assumed loss of the Prairie Island Units.
8.2.3    Protection and Control for Interconnections Each of the 161, 34.5 and 13.8 KV sources has both overcurrent and breaker failure protective relaying.
All 345, 161, 34.5 and 13.8 KV breakers are equipped with dual trip coils.
Each of the 345 and 161 KV feeders transmission line feeder breakers has primary, secondary and breaker failure protective relaying.
The DC control system in the substation consists of two completely independent 125 volt systems. Each system has its own battery, charger and fused distribution cabinet. One 125 volt system is used for primary relaying requirements, operation of breaker trip coil #2, backup supply to breaker charging motors and MOD control. The second 125 volt system is used for secondary relaying requirements, breaker controls, operation of breaker trip coil #1 and breaker failure relaying.
Controls for 1H2 and 1H4 13.8 KV Medium Voltage Switchgear Breakers (MVSBs) are in the Substation control house. DC control power for the cooling tower area 4.16 KV breakers is supplied by a single 48 volt battery located with the 4160 volt switchgear in the Cooling Tower Equipment House.
604000000033 Under normal operating conditions the 13.8 KV breakers 1H2, 1H4 and 4160 volt breaker CT11-1, CT11-6, CT11-8, CT12-6, CT12-7 and CT12-8 are closed and the 4160 volt bus tie CT-BT 112 is open. Bus Tie breaker CT-BT 112 is normally maintained in the open position and can be manually closed so that either cooling tower area transformer can supply both 4160 V bus sections.
A 345 KV bus #2 Lockout, No. 10 Transformer Lockout, operation of either the 13.8 KV feeder overcurrent or ground detection relaying, Lockout of CT 12 Transformer, or Lockout of 2RS Transformer (if 8H12 is closed) will trip and lockout 1H2 - 13.8 KV MVSB and the 4160 volt source breaker CT12-7. 1H2 breaker failure relaying will also trip and lockout CT12-7.
With only CT11 Transformer feeding both 4.16 KV bus sections CT11 and CT12, 604000000033 breaker CT 12-7 is open and CT-BT 112 is closed. With a fault on bus section CT12, protective relays operate a lockout relay to trip and lockout breaker CT-BT 112 and to lockout breakers CT12-7 and CT11-1.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.2-5 A phase or ground fault on 4160 volt feeder from CT12 Bus to Plant Safeguards Bus 26 604000000033 operates protective relays and trip 4.16 KV breaker CT12-6. A phase or ground fault on the 4160 volt feeder from CT12 Bus to Plant Safeguards Bus 25 operates protective relays and trips 4.16 KV breaker CT12-8.
A 345 KV Bus #1 Lockout, CT1 Transformer Lockout, operation of either the 13.8 KV feeder overcurrent or ground detection relaying, Lockout of CT11 Transformer, or Lockout of 2RS Transformer (if 8H10 is closed) will trip and lockout 1H4 - 13.8 KV MVSB and the 4160 volt source breaker CT11-1. 1H4 breaker failure relaying will also trip and lockout CT11-1.
With only CT12 Transformer feeding both 4.16 KV bus sections CT11 and CT12, breaker CT11-1 is open and CT-BT 112 is closed, a fault on bus section CT11, protective relays will operate a lockout relay to trip and lockout breaker CT-BT 112 and to lockout breakers CT11-1 and CT12-7.
604000000033 With a phase or ground fault on the 4160 V feeder from CT11 Bus to Plant Safeguard Bus 16, protective relays operate and trip breaker CT11-6. A phase or ground fault on the 4160 volt feeder from CT11 Bus to Plant Safeguards Bus 15 operates protective relays and trips 4.16 KV breaker CT11-8.
The No. 1 and No. 2 Generator Step Up Transformers are each provided with an over-undervoltage relay to protect the transformer against grounds or an overvoltage condition occurring on the transformer while it is energized from the 345 KV Substation and delivering station auxiliary load.
8.2.4   Onsite Interconnections Three separate power systems are provided by the Substation to the Plant 4160 volt safeguards buses. An overhead 161KV transmission line from the Substation to the Plants 161/4.16KV 1R Transformer provides power to the Unit 1 4160 volt safeguards buses 15 and 16. An underground 35KV line from 345/35KV 2RS transformer in the substation to the Plants 35/4.16KV 2RY Transformer provides power to the Unit 2 4160 volt safeguards buses 25 and 26. Two underground 13.8 KV feeders from the 345/13.8 KV Cooling Tower Transformer (CT1) and the tertiary of the 345/161/13.8 KV No. 10 Transformer provides the power to the Cooling Tower Substation 13.8/4.16 KV transformers CT11 and CT12.
These transformers supply separate buses in the Cooling Tower 4160 volt switchgear that may be connected together by a bus tie breaker. Underground feeders from Cooling Tower Bus CT11 feed Unit 1 safeguards buses 15 and 16. Underground feeders from Cooling Tower Bus CT12 feed Unit 2 safeguards buses 25 and 26.
1R Transformer, 2RS Transformer, CT1 Transformer and No. 10 Transformer can be supplied power from any of the four 345kV transmission lines.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.2-6 The 13.8 KV tertiary of 345/161/13.8 KV No. 10 Transformer is the source to 1H2 13.8 KV MVSB in the Substation. 1H2 13.8KV ACB is the source breaker for the underground feeder to the cooling tower area 13.8/4.16 KV CT12 Transformer.
CT12 Transformer supplies 4.16 KV Bus Section CT12 through CT12-7, which is a 604000000033 4.16 KV MVSB in the Cooling Tower Equipment house. 4.16 KV Bus Section CT12 feeds the Unit 2 Safeguards 4.16 KV Bus 25 through 4.16 KV MVSB CT12-8, and 25-5, and Bus 26 through 4.16 KV MVSB CT12-6, and 26-13.
345/13.8 KV CT1 Transformer is the source to 1H4 13.8 KV MVSB in the Substation.
1H4 13.8 KV MVSB is the source breaker for the underground feeder to the cooling tower area 13.8/4.16KV CT11 Transformer. CT11 Transformer supplies 4.16 KV Bus Section CT11 through CT11-1, which is a 4.16 KV MVSB in the Cooling Tower 604000000033 Equipment house. 4.16 KV Bus section CT11 feeds Unit 1 Safeguards 4.16 KV Bus 15 through 4.16 KV MVSB CT11-8, and 15-7, and Bus 16 through 4.16 KV MVSB CT11-6, and 16-8.
8.2.4.1    Paths for Unit 1 Safeguards Trains For Unit 1 there are four possible paths between the offsite transmission system and the safeguard 4160V buses. Each path is capable of providing the required power to shutdown the reactor and maintain it in a shutdown condition. These four paths are as follows:
The first path is fed from the 161kv switchyard bus. This feeds the 1R transformer which in turn supplies power to buses 15 and 16.
The second path is fed from the 345KV switchyard Bus 1. This feeds the 345/13.8KV Cooling Tower Transformer No. 1 which is connected via an underground cable run to the 13.8/4.16KV cooling tower transformer CT11.
The secondary of this transformer feeds buses 15 and 16 through breakers CT11-1 and CT11-6.
The third path is fed from the 345kv switchyard to transformer 2RS, transformer 2RY, breaker 2RYBT, breaker 12RYBT, breaker 1RYBT and then to buses 15 and 16.
The fourth path is fed from the 13.8kv tertiary winding of the 345/161/13.8KV No. 10 Transformer. This 13.8kv feed supplies underground cable to 604000000033 13.8/4.16KV cooling tower transformer CT12. From here is it fed through bus tie breaker CT-BT 112 to breakers CT11-8 and CT11-6 and finally to buses 15 and 16, respectively.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.2-7 8.2.4.2    Paths for Unit 2 Safeguards Trains For Unit 2 there are four possible paths between the offsite transmission system and the safeguard 4160V buses. Each path is capable of providing the required power to shutdown the reactor and maintain it in a shutdown condition. These four paths are as follows:
The first path is fed from the 345kv switchyard to transformer 2RS, breaker 2RSY, transformer 2RY and then to buses 25 and 26.
The second path is fed from the 13.8kv tertiary winding of the 345/161/13.8KV No. 10 Transformer. This 13.8kv feed supplies underground cable to 13.8/4.16KV cooling tower transformer CT12. From here it is fed through breaker CT12-6 to buses 25 and 26.
The third path is fed from the 161kv switchyard bus. This feeds the 1R transformer, breaker 1RYBT, breaker 12RYBT, breaker 2RYBT and then to buses 25 and 26.
The fourth path is fed from the 345KV switchyard Bus 1. This feeds the 345/13.8KV Cooling Tower Transformer No. 1 which is connected via an 604000000033 underground cable run to the 13.8/4.16KV cooling tower transformer CT11.
The secondary of this transformer feeds breaker CT-BT 112 to breakers CT12-8 and CT12-6 and then to buses 25 and 26, respectively.

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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.3-1 8.3    AUXILIARY POWER SYSTEM 8.3.1    Design Basis The auxiliary electrical system is designed to provide redundant electrically and physically separated buses for the safety feature loads for each unit. As shown in Figure 8.3-1, the redundant safety features loads (per Unit) are divided between these buses, with each bus fed (in emergency) from a different Emergency Diesel Generator.
No paralleling or synchronizing of Emergency Diesel Generators is required.
Two normally open bus tie breakers are provided between each 4160V bus section of one Unit and the companion bus section of the second Unit. These tie breakers would be closed only during a station blackout as discussed under 8.4.4, or during maintenance, testing, or other manually supervised operations.
8.3.2    Description The basic components of the plant electrical system are shown in Figure 8.3-1.
The plants main generators serve as the main source of auxiliary electrical power to the non-safeguards buses during on-the-line operation of the plant. Power is supplied by a 20/4.16 KV three winding Main Auxiliary Transformer that is connected to the main leads from the generator via isolated phase bus connections having the same reliability as the main generator leads. Each safeguards bus is normally supplied from one of two possible offsite sources.
8.3.2.1    Load Transferring During controlled startup, the non-safeguards 4160 volt auxiliary power buses are manually transferred without interruption from the Reserve Auxiliary Transformer to the Main Auxiliary Transformer (and in the reverse direction on shutdown), under supervision of synchronism check interlock relays.
Trouble in the reactor, turbine, main generator, Generator Step Up, or Main Auxiliary Transformer, calling for isolation of the Unit from the system, would automatically initiate a supervised fast transfer of station auxiliaries from the Main Auxiliary Transformer to the Reserve Auxiliary Transformer. In the event that the safeguards buses are subjected to an undervoltage condition, the logic attempts to transfer the safeguards buses to their respective alternate offsite sources, if available, either the Reserve Auxiliary Transformers or the Cooling Tower Transformers.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.3-2 Assuming a normal successful transfer, the Emergency Diesel Generators would not start and their connecting circuit breakers would not close because the buses would be re-energized from the alternate offsite sources. In case of an unsuccessful transfer to the alternate offsite source, the associated Emergency Diesel Generators would automatically start, come up to speed and voltage, and close on to the safeguards buses.
All electrically operated circuit breakers used in the 4160 volt and 480 volt Auxiliary Electrical System are of the stored energy type to ensure reliable operation.
8.3.2.2     Load Sequencing Starting of safety features loads is sequenced in five second steps to avoid momentarily overloading a power source by sudden application of too great a load. The control or logic equipment to accomplish this sequential loading consists essentially of programmable logic controllers (PLC) which have undergone extensive verification testing as outlined in NSPs letter to the NRC, (Reference 1). Control and logic systems are designed to ensure maximum reliability of the system within the safety requirements that the control scheme must provide.
8.3.2.3     4160 Volt Auxiliary System The 4160 volt auxiliary system for each unit is divided into safety related and non-safety related buses. The non-safety related buses are arranged so that each bus can be supplied from its associated main generator through its Main Auxiliary Transformer or from the 345kV/161kV system through the Reserve Auxiliary Transformers. All 4160 volt auxiliaries are distributed between the 4160 volt buses in accordance with reliability requirements and diversity. For Unit 1, buses 11 and 12 serve large reactor auxiliaries (Reactor Coolant Pumps, Feedwater Pumps). Buses 13 and 14 serve general plant auxiliaries. Buses 21, 22, 23 and 24 serve similar functions for Unit 2.
The safety related (safeguards) 4160 volt buses 15, 16, 25 and 26, can be supplied from the 345 KV/161KV system through the Reserve Auxiliary Transformers and the Cooling Tower Substation Transformers, or from one each of the four Emergency Diesel Generators. Buses 15 and 16 serve engineered safety feature auxiliaries on Unit 1, and buses 25 and 26 serve similar functions on Unit 2.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.3-3 8.3.2.4     480 Volt Auxiliary System The 480 volt auxiliary system for Unit 1 consists of ten power centers, six of which serve non-safety related equipment. Five of the non-safety related centers are double-ended, consisting of a split bus, a bus tie break, and two 4160/480 volt transformers. The sixth center is single-ended, consisting of a single bus and transformer. For Unit 1, 480 volt power for engineered safety features and other essential plant loads is fed from load centers 111, 112, 121 and 122. These load centers are fed from step-down transformers connected to 4160 volt buses 15 and 16. Normal operation is with the normal feed transformer of a load center energized, and carrying the single bus normally associated with it.
For Unit 2 there are ten power centers, six of which serve non-safety related equipment.
Five of the non-safety related centers are double-ended, consisting of a split bus, a bus tie break, and two 4160/480 volt transformers. 480 volt power for engineered safety features and other essential plant loads is fed from load centers 211, 212, 221, and 222.
These load centers, are fed from 4160 volt buses 25 and 26. Normal operation is with the normal feed transformer of a load center energized, and carrying the single bus normally associated with it.
Alternate power sources for the 480V safeguards buses, from the same train of the opposite unit, are included in the design. These are used primarily for ease of maintenance during outages on the 4.16 KV buses, and are not required for operation.
Each alternate source line-up consists of an incoming line compartment, and a 4160-480 volt transformer section. One alternate souce line-up per train is provided for use by either or both 480V safeguards buses.
NRC Bulletin 88-10, Nonconforming Molded-case Circuit Breakers and Supplement 1 to Bulletin 88-10 requested licensees to provide reasonable assurance that molded-case circuit breakers purchased for use in safety-related application without verifiable traceability to the manufacturer can perform their intended safety functions. Northern States Power responded to NRC Bulletin 88-10 as it applied to Prairie Island in References 2 and 3. In response to Supplement 1 to NRC Bulletin 88-10, as documented by Reference 3, Northern States Power reviewed and verified that the provisions of the bulletin were met and provided additional clarification on actions taken with respect to six nontraceable molded-case circuit breakers. The NRC Staff found the Northern States Power response to NRC Bulletin 88-10 and Supplement 1 acceptable in Reference 4.
8.3.3     Performance Analysis The physical locations of electrical distribution system equipment are such as to minimize vulnerability of vital circuits to physical damage as a result of accidents.
Main and Reserve Auxiliary Transformers are located outside and are physically separated from each other.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.3-4 Lightning arresters are used where applicable for lightning protection. All oil transformers located close to the plant are covered by water-spray systems to extinguish oil fires quickly and prevent the spread of fire. The transformers have oil catch basins and drains to remove oil from the transformer area in case of an oil spill or leak. Transformers are spaced to minimize their exposure to fire, water, and mechanical damage.
The design of the Auxiliary Electrical System capacity is based on computerized studies of loading under normal running, normal sequential starting, and emergency transfer of the system from normal to reserve source conditions.
System capacity is adequate to operate the plant in a safe manner under all normal conditions. Under emergency conditions, automatic load shedding and tripping of non-essential loads are provided in the transfer control system, prior to connecting safety features loads to the emergency diesel generators.
The adequacy of station electric distribution voltages was analyzed in accordance with Plant System Branch position PSB-1. The analysis demonstrated:
: a. Station distribution system voltages remain acceptable under minimum and maximum expected values of grid voltage for motor starting and running
: b. Undervoltage protection circuitry is not challenged with minimum expected values of grid voltage and component drift The analysis results were used to establish operating guidelines which guarantee a minimum 4160V safeguards bus voltage of 94.8% to allow long term operation on offsite power without actuating degraded voltage protection relays (set at 95.5  .7%). Testing and analysis (Reference 19) have shown that all safeguards loads will operate properly at or above the minimum degraded voltage setpoint.
Sufficient protective devices, circuit breakers, and fuses, are provided and coordinated 604000000193 to assure isolation of faulted equipment with a minimum of disturbance to the rest of the system. Electrical coordination is also credited in the post-fire safe shutdown analysis described in 10.3.1.
The design of the system is such that sufficient independence or isolation between the various sources of electrical power is provided in order to guard against concurrent loss of all auxiliary power.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.3-5 Independence or isolation of supply to the various duplicated auxiliaries provided as engineered safety features is maintained so that a single failure does not result in a loss of more than one group of the plants redundant engineered safety features systems.
Arrangements and location of the components of the auxiliary power system, transformers, switchgear, cable runs containment vessel penetrations, etc., provides this isolation. A simple arrangement of buses is provided, requiring a minimum of switching to restore power to the bus in the event that the normal supply to that bus is lost.
Special attention has been given to the separation of cable trays, troughs, and channels, and the routing of cable trays to avoid fire hazards areas. Power cables are separated from control or instrumentation cables. Control and power cables for the engineered safety features system have a minimum separation between redundant circuits of 36 inches. Where closer spacing cannot be avoided, an approved barrier is placed between the circuits. Cable entrances into the control room, relay room, and Class I areas are sealed to prevent the entrance of smoke and fire from outside sources. In the D5/D6 Building cable and trays are routed in accordance with IEEE-384-1981. Refer to Section 8.7 for more detailed information on all separation requirements.
Two separated control trains are provided for redundancy in the engineered safety features system. This separation is maintained to preclude the possibility of any single incident causing both systems to become inoperative.
The supervised fast transfer of the auxiliary system or its components from the Main Auxiliary Transformer to Reserve Auxiliary Transformer is automatically controlled to assure a minimum interrupted time for power and a minimum effect on the system.
The 4160 volt switchgear and 480 volt load centers are located in areas which minimize their exposure to mechanical, fire, and water damage. This equipment is properly coordinated electrically to permit safe operation of the equipment under normal and short-circuit conditions.
The 480 volt motor control centers are located in the areas of electrical load concentration. Those associated with the turbine-generator auxiliary system in general are located in the turbine building. Those associated with the nuclear steam supply system are located in the Auxiliary Building.
The application and routing of control, instrumentation and power cables are such as to minimize their vulnerability to damage from any source. All cables are designed using conservative margins with respect to their current carrying capacities, insulation properties, and mechanical construction.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.3-6 All engineered safety features power cable insulation and all power cables in the containment have fire-resistant sheathing selected to minimize the harmful effects of radiation, heat and humidity. Appropriate instrumentation cables are shielded to minimize induced voltage interference. Wire and cables related to engineered safety features and reactor protection systems are routed and installed to maintain the integrity of their respective redundant channels and protect them from physical damage. This wire is color-coded and routed in color-coded cable trays.
Supports for cable trays are designed in accordance with the tray manufacturers recommendation, based upon 100% tray load (corresponding to 40% cross-sectional fill) and calculated seismic loads. The number of conductors in a tray is limited according to factors recommended by the 1990 National Electric Code (NEC) or the cable manufacturer. Trays filled beyond 40% cross-sectional fill or the NEC recommendations are evaluated.
Cables in trays are derated for ambient temperatures.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-1 8.4     PLANT STANDBY DIESEL GENERATOR SYSTEMS 8.4.1     Design Basis The normal power sources for the safeguards buses are the 161-4.16/4.16 KV Reserve Auxiliary Transformer (Unit 1 1R), the 34.5/4.16 KV Reserve Auxiliary Transformer (Unit 2 2RY), and the redundant 13.8-4.16 KV Cooling Tower Substation buses (Unit 1 CT11 and Unit 2 CT12), as discussed in Section 8.2.1.
If the Reserve Auxiliary Transformers and the Cooling Tower Substation buses should fail, backup power is provided by two Emergency Diesel Generators in each unit sized and connected to serve the engineered safety features equipment of the unit. Each Emergency Diesel Generator is sized to start and carry the engineered safety features load required for the Design Basis Accident and concurrent loss of offsite power (LOOP).
In the event that an Emergency Diesel Generator fails to start, only one set of redundant safety features components would be lost in that unit. By means of later manual switching, safety features components on the bus associated with a failed Emergency Diesel Generator could be fed from the other Units Emergency Diesel Generator up to the capacity of the running engine, as discussed under 8.4.4. There is no single known component whose failure prevents both Emergency Diesel Generators in a Unit from starting.
Emergency Diesel Generator starting control is independent of the AC system except for the associated 4.16 KV bus voltage-detecting relay which is connected in a fail-safe manner to start the Emergency Diesel Generator on loss of AC power.
Unit 1 Emergency Diesel Generator equipment is located in separate heated rooms, protected from atmospheric conditions, in a Class I portion of the Turbine Building, permitting nearly ideal rapid-start conditions. The rooms are connected by a single access opening which is provided with a Class A fire rated door. The door, which is normally closed, is furnished with an extra-strong door closer equipped with a fusible link arm. Since the wall separating the two emergency diesel generators is parallel with the rotation of the diesel generator, it is incredible that a missile generated by the failure of one diesel generator will breach the wall opening.
Unit 2 Emergency Diesel Generator equipment is also located in separate rooms, protected from atmospheric conditions, in the Class I D5/D6 Building. These rooms are separated by a twelve inch thick reinforced concrete barrier. There are no wall openings directly between the two rooms.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-2 8.4.2      Description Each Emergency Diesel Generator, as a backup to the normal standby AC power supply, is capable of sequentially starting and supplying the power requirements of one of the redundant sets of engineered safety features for its reactor Unit. In addition, in the event of a station blackout (SBO) condition, each Emergency Diesel Generator is capable of sequentially starting and supplying the power requirements of the hot shutdown (Mode 3, Hot Standby in ITS) loads for its unit, as well as the essential loads of the blacked out unit, through the use of manual bus tie breakers interconnecting the 4160V buses as discussed in 8.4.4.
Unit 1 Emergency Diesel Generators (D1 and D2)
The Unit 1 Emergency Diesel Generators consist of two Fairbanks Morse units each rated at 2750 KW continuous (8760 hr basis), 0.8 power factor, 900 rpm, 4160 Volt, 3-phase, 60 Hertz. The 1,000 hour rating of each Emergency Diesel Generator is 3000 kilowatts. The 30 minute rating of each unit is 3250 kilowatts maximum. This figure is based on cooling water at a maximum temperature of 95&deg;F and ambient air at a temperature of 90&deg;F. The limitations imposed by the generator and the heat removal equipment limits the overall 30 minute rating of the system to 3250 kilowatts.
Each diesel engine is automatically started by compressed air stored at a pressure of approximately 250 psia. Two parallel solenoid admission valves deliver air simultaneously to a timed pilot air-distributor valve and an individual air-start valve located in each of the twelve cylinders. Starting air is thus admitted directly into the cylinder liners for fast, reliable cranking and starting. Adequate cranking effort is obtained with only six air valves. The additional six valves give increased starting reliability.
Each Unit 1 Emergency Diesel Generator has its own independent air starting system including a motor-driven air compressor, (powered from a 480 Volt emergency bus) and two accumulators each of sufficient capacity to crank the engine for 20 seconds. An interconnecting header with manual valving is provided between the starting system of the two engines, to allow the air accumulators of the opposite engine to be replenished.
Cranking continues until the engine starts (speed over 250 rpm) or until a predetermined time limit (10-15 seconds) has elapsed, whichever occurs first. If an engine fails to start within the predetermined time limit, a start failure alarm is initiated and the engine control locks out, requiring manual reset.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-3 Unit 2 Emergency Diesel Generators (D5 and D6)
The Unit 2 Emergency Diesel Generators consist of two tandem-drive units (gensets) manufactured by Societe Alsacienne de Constructions Mecaniques de Mulhouse (SACM), each rated at 5400 KW continuous (8760 hr basis), 0.8 power factor, 1200 rpm, 4160V, 3-phase, 60 Hertz. The gensets are radiator cooled independent of the plant cooling water system.
Each Unit 2 genset, has its own air starting system consisting of four independent subsystems, composed of a dryer, compressor (powered from a 480 volt nonsafeguards bus), and air receiver. Any two of the four air receivers will start the genset within ten seconds. This capability allows each Unit 2 genset to remain available to start and accept load within 10 seconds when only two of the four starting air receivers are charged to a pressure of 480 psig. (Reference 39 and Reference 44)
For each Unit 2 genset to be considered operable, any three of the four air receivers charged to a pressure of 480 psig are required. This ensures that the genset will start and accept load within 10 seconds and ensures the capability of the air receivers to provide a minimum of five cranking cycles without recharging. This is an air receiver sizing requirement. (Reference 38 and Reference 44)
Cranking continues until the genset starts (based on lube oil pressure) or until five seconds has elapsed, whichever occurs first. If the genset fails to start within the five seconds, a start failure alarm is initiated and the genset control locks out, requiring manual reset.
The two air-start subsystems for each engine of the genset have interconnecting piping to the fuel injection stop jacks on the other engine. This piping is pressurized only on an overspeed trip by a valve device which opens at the overspeed setpoint. The piping to the opposite engine stop jack is to assure that both engines shutdown on an overspeed trip without depending on the governor shutdown solenoid valves. Each engine has two separate overspeed trip devices.
The Unit 2 gensets are provided with various surveillance instrumentation as defined in IEEE 387-1977. This instrumentation permits remote and local monitoring to indicate 604000000174 the occurrence of abnormal, pre-trip and trip conditions. Except for overspeed, generator differential current and manual emergency stop, the trip functions of the EDG system are bypassed in the event of Safety Injection or Undervoltage Start signal.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-4 Units 1 and 2 Emergency Diesel Generators (D1, D2, D5, D6)
Control voltage for the diesel starting/control system is obtained from 125 volt DC System 11 for D1, and DC System 12 for D2. Similarly, control voltage is obtained from DC System 21 for D5, and DC System 22 for D6. Figures 8.5-1a, 8.5-1b, 8.5-2a and 8.5-2b show the 125V DC distribution for Unit 1 and Unit 2. For D1 and D2, loss of DC control power after the engine starts will not stop the engine or interfere with its operation. Direct current power must be restored to stop the engine electrically. For D5 and D6, engine speed control will fail to the hydraulic droop governor so that the speed/frequency depends on busload per the hydraulic governor droop curve. If only the control circuit for the genset control is lost, it will keep on running; however, if the entire DC source to the Vertical Panel for all circuits is lost, the diesel will keep running and cooling fans and fuel booster pumps will be lost. The operator would have to manually stop the genset.
To ensure rapid start, each diesel generator is equipped with electric heaters which furnish heat to the engine cooling water and engine lubricating oil when the engine is shut down. Motor driven circulating pumps for cooling water and lube oil operate continuously when the engines are shut down.
For each EDG, an audible and visual alarm system is mounted on the control panel located adjacent to the associated engine. An engine trouble alarm is sounded in the main control room whenever an alarm is sounded on the local engine generator control panel. A main control room alarm also sounds if the controls at the engine are not set on automatic, or DC control power is lost.
Sufficient fuel is stored in the day tank for each Unit 1 Emergency Diesel Generator for up to two hours operation at full load. Sufficient fuel is stored in the day tank for each Unit 2 EDG for at least 60 minutes of operation at the level where oil is automatically added to the day tank based on the fuel consumption at a load of 100% of the continuous rating of the EDG plus a minimum margin of 10% per ANSI N195-1976.
Fuel from interconnected storage tanks can be transferred to the day tanks by electric pumps for operation of any single Emergency Diesel Generator up to two weeks. See Section 10.3.13 for further information.
Redundancy and flexibility are provided by two engineered safeguards buses, serving safety related equipment, associated with each of the two Units, connected so that each safeguards bus is served from a different Emergency Diesel Generator (four total). The sequence in which the safeguards loads are picked up by the Emergency Diesel Generators, and the delay times required, are discussed in the following loading description:

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-5 Each Emergency Diesel Generator is automatically started by either of the following events:
: a. Undervoltage, which envelopes loss of voltage (including LOOP), or degraded voltage on the associated 4160 Volt buses (buses 15 and 16 for D1 and D2, and buses 25 and 26 for D5 and D6 respectively. Automatic starting of the Emergency Diesel Generators is initiated by a modified 2-out-of-4 voltage relay scheme on each 4160 Volt bus to which the Emergency Diesel Generator is to be connected.
: b. Initiation of a Safety Injection Signal (both of the affected Units Emergency Diesel Generators start on this signal).
Undervoltage Logic Relays are provided on buses 15, 16, 25 and 26 to detect undervoltage and degraded voltage conditions. The undervoltage setpoint is 75  2.5% with a time delay of 4  1.5 seconds. When an undervoltage condition exists on any of these buses, the associated PLC based Load Sequencer automatically initiates the following steps for the affected bus.
: a. Trip source breakers to the bus.
: b. Load rejection of designated loads on bus.
: c. If the alternate offsite source is available, attempt to restore power from the alternate source.
: d. If the alternate offsite source is not available, or does not successfully restore the bus, the associated Emergency Diesel Generator auto starts.
: e. The EDG breaker closes onto the bus after the EDG has met established frequency and voltage criteria (within 10 seconds of receiving start signal).
: f. Load restoration by sequenced steps at 5 second intervals.
If an SI signal is received during an undervoltage condition, the EDG is started and steps c and d above are not performed.
If an SI signal is present and the Emergency Diesel Generator is supplying power to the bus when an undervoltage occurs, its breaker is not tripped in item a. above. The bus remains powered from the Emergency Diesel Generator, and there is no load rejection or load restoration.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-6 Degraded Voltage Logic The degraded voltage setpoint is 95.5  0.7% with time delays of 8  0.5 seconds and 60  3 seconds. The upper limit to the setpoint has been established to preclude unnecessary actuations of the voltage restoration scheme at the minimum expected grid voltage. Analysis has shown that the 8 second delay is adequate to account for normal transients, such as voltage dips from the starting of large loads, and is longer than the time required to start the Safety Injection pump at minimum voltage. This first delay annunciates that a degraded voltage condition exists. The second delay of 60 seconds allows the degraded condition to be corrected by external actions within a time period that will not cause damage to the operating equipment. With degraded voltage on any of the four safeguards 4160V buses, the associated PLC based Load Sequencer automatically initiates the following steps after the 60 second delay.
: a. Auto start the Emergency Diesel Generator and trip the offsite source breakers to the bus.
: b. Load rejection of the designated loads on the bus.
: c. Close the breaker to the Emergency Diesel Generator once it has met established voltage and frequency criteria (within 10 seconds of receiving start signal).
: d. Load restoration by sequencing loads at 5 second intervals.
If a SI signal is received during the 60 second degraded voltage time delay, the above logic is immediately actuated by the Load Sequencer with SI loads added during the last step, item d. Except for auto starting the Emergency Diesel Generator, that is a function of the SI signal.
In both the undervoltage and degraded voltage scenarios described above, after voltage is re-established on the subject 4160 Volt bus, either from an offsite source or from an Emergency Diesel Generator, the Emergency Diesel Generator, if started (see discussion under 8.4.2), continues to run (loaded or unloaded) until manually shut down. The 480 Volt buses are immediately energized at the same time as the 4160 Volt bus from which it is fed.
Motors and loads which are operating or connected prior to the loss of voltage condition, that were not shed either automatically or manually during the time of voltage loss, and whose start signals are sealed-in would automatically restart or be re-energized upon return of bus voltage.
Motors not running prior to the loss of voltage condition would not start upon restoration of voltage, until subsequent manual or automatic action is initiated.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-7 Load Sequencer Out of Service With properly aligned 480V loads, the offsite sources have been analyzed to verify that a load sequencer failure will only affect the ability of the associated EDG to automatically power its respective safeguards loads following a LOOP independent of, or coincident with, a Design Basis Event.
Emergency Diesel Generator Loading Three 25 HP Waste Gas Compressors are supplied, two fed from Emergency Diesel Generator D1 and one fed from Emergency Diesel Generator D2. One waste gas compressor is included in Step 1 of the load sequence for Emergency Diesel Generator D1 and one waste gas compressor is included in Step 1 of the load sequence for Emergency Diesel Generator D2. (Reference 43)
Three air compressors (121, 122, 123) feed into a common Instrument Air header which, in turn, supplies Instrument Air for both Unit 1 and Unit 2. Compressor 121 is fed from Emergency Diesel Generator D1, via Unit 1 480 Volt Bus 111. Compressor 122 is fed via Unit 1 480 Volt Bus 121 from Emergency Diesel Generator D2. Compressor 123 is fed via Unit 2 480 Volt Bus 211 from Emergency Diesel Generator D5.
Instrument Air is not essential for plant safety during a DBA, however, for nonsafeguards reasons, it is desirable to maintain Instrument Air if possible under this condition, one compressor is adequate for both units. Assuming either Unit 1 Emergency Diesel Generator (D1 or D2) is operating, either Air Compressor 121 or 122 can be assumed to be operating. Similarly, if Emergency Diesel Generator D5 is operating, Air Compressor 123 can be assumed to be operating.
Safeguards MCCs and their associated motor operated valves are energized simultaneously with the 480V safeguards busses except for the pressurizer heaters MCCs which are energized on Step 6 of the Load Restoration Sequence.
Loading on Emergency Diesel Generators is analyzed for a worst case condition as represented by a Safety Injection signal coincident with a complete loss of offsite power.
(References 41 and 43) A small break LOCA that was sufficient to initiate automatic Safety Injection (SI) action would represent the same inrush KVA load on the Emergency Diesel Generator. If the break is so small that automatic SI is not initiated, manual action would be required as soon as the operator is aware of the break. Manual action would represent loads less than or equal to that analyzed in the calculations.
A small break would represent considerably less running load on the RHR Pump and possibly less on the SI Pump, but a longer running time for the SI Pump.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-8 Emergency Diesel Generator Design and Qualification The redundant onsite standby power sources and their corresponding distribution systems are arranged in the Prairie Island plant to meet all the requirements of Safety Guide 6.
Emergency Diesel Generators D1 and D2 were sized per AEC Safety Guide 9, Paragraph C-2, which requires the predicted load seen by an EDG not to exceed the smaller of either the 2000 hour rating or 90% of the 30 minute rating. The D1/D2 2000 hour rating is unknown. The continuous rating, which bounds the 2000 hour rating conservatively, is 2750 KW. The D1/D2 30 minute rating is 3250 KW, and 90% of the 30 minute rating is 2925 KW. Therefore, the conservative limit of 2750 KW is placed on D1/D2 predicted loads.
Analyses of maximum predicted loading for transient (Reference 43) and steady state conditions (References 36 and 42) show predicted loads are less than the conservative limit of 2750 KW. Therefore, D1 and D2 continue to meet the loading guidelines of paragraph C-2 of Safety Guide 9. Preoperational testing was performed on D1 and D2 in accordance with paragraph C-3 of Safety Guide 9.
With reference to Paragraph C-4 of Safety Guide 9, tests performed on a prototype of the Unit 1 Emergency Diesel Generator and subsequent calculations indicated that the speed limitations listed in Safety Guide 9 are met by Prairie Island Unit 1 Emergency Diesel Generators D1 and D2.
With reference to voltage variations, the prototype tests and subsequent calculations and surveillance testing indicate that the first inrush seen by the diesel when starting both the safety injection pump and the nonrejected loads that are connected to the EDG supplied bus can cause the voltage to decrease in excess of the 75% of nominal as stated in Safety Guide 9, and not be restored to normal within a maximum of 40% of the step duration (2 seconds). This voltage dip occurs on the first step of load application to the Emergency Diesel Generator and this exception to Safety Guide 9 does not degrade the reliability of the safety features in the plant for the following reasons:
: 1. Integrated SI testing history shows that < 3 seconds (60% of 5 seconds) is achieved. This is within the guidelines of Reg. Guide 1.9, Revision 2 utilized for D5/D6.
: 2. The Load Sequencer time interval is controlled by an internal digital clock in the Programmable Logic Controller driven Load Sequencer. This provides a very high degree of accuracy and repeatability in sequence timing. This lessens the needed margin between recovery from the dip and the end of the load step.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-9
: 3. Historical data shows that the voltage returns to 100% well within five seconds as discussed below, assuring that excitation returns to normal, and full voltage is available for starting equipment at the beginning of the second load sequence step.
Engine speed under loading condition is difficult to predict accurately, but momentary speed drop during predicted inrush conditions will reach 90% with recovery in 2 to 4 seconds. Actual performance verification data is available from the Pre-Operational Surveillance Test results. Surveillance tests (SP1083) have shown 100% voltage recovery within three seconds.
The Unit 2 Emergency Diesel Generators (D5 and D6) meet the requirements of Reg.
Guide 1.9, Revision 2, except portions of the 1984 Edition of IEEE 387 were implemented in the factory testing instead of the 1977 revision (NSP letter to NRC, September 9, 1989, Reference 5). These two diesel generators are rated at 5400 KW continuous. Analyses of maximum predicted loading for transient (Reference 41) and steady state conditions (References 36 and 42) show predicted loads are less than the conservative limit of 5400 KW. Thus the guidance of Reg Guide 1.9 paragraph C2 is satisfied. Testing has proven that the loading capabilities required by Reg Guide 1.9 paragraph C4 are also satisfied.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-10 8.4.3    Performance Analysis: Loss-of-Coolant Accident and Loss of Offsite Power Situations in which the high head safety injection pumps and the Emergency Diesel Generators would be simultaneously required are limited to the loss of either primary or secondary coolant from one Unit, concurrent with the loss of offsite a-c power. In the event of an accident requiring safety injection in one Unit, accompanied by loss of offsite power, the sequence of automatic operations is as follows:
: a. A safety injection signal is derived from SI actuation circuits;
: b. Reactor and turbine both trip;
: c. When the reactor coolant pressure has fallen below 700 psi, the accumulators attached to the cold legs of loops A and B discharge their contents of borated water into the Reactor Coolant System;
: d. The Emergency Diesel Generators start and upon loss of offsite power, as sensed by voltage relays, the load sequencers connect each Emergency Diesel Generator to its safeguards bus; Upon receipt of a command signal, the Emergency Diesel Generators start. Within ten seconds, the EDG is up to speed and ready to accept load. As a result of continuing undervoltage on the buses, designated breakers then close, placing the EDG on the buses which feed the engineered safety features equipment (see discussion under 8.4.2). The load sequence on each Emergency Diesel Generator would be:
Step 1:   Safety Injection Pump and 480 V buses Step 2:   Residual Heat Removal Pump Containment Spray Pump Step 3:   121 Cooling Water Pump (Unit 2 only)
Step 4:   Component Cooling Water Pump 2 Fan Coil Units Step 5:   Auxiliary Feedwater Pump (Unit 1 Train B, Unit 2 Train A) 1 Air Compressor (except Unit 2 Train B)
Step 6:   Pressurizer Heaters EDG Auxiliaries (Unit 2 only)
Step 7:   Control Room Chiller Chiller Water Pump The time delay between starting the various components is long enough to allow the drive motors to approach synchronous speed (5 seconds or until voltage recovers, whichever is longer) as described in Section 8.4.2. The engines for the emergency diesel driven cooling water pumps are direct-connected to the pumps and operate independently of the Emergency Diesel Generators. Charging pumps are not 604000000327 necessary, and have not been included in the automatic starting sequence.
The instrument Air Compressors have a built-in 10 second restart time delay that will cause them to start after Step 5.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-11 The configuration and operation of the Safety Injection System during the injection and recirculation phases of mitigation of a loss of coolant accident are described in Section 6.2.
In addition to the double ended break of a main reactor coolant pipe, all other less severe ruptures of the Reactor Coolant System require the operation of the engineered safety features system to an extent which depends upon the size of the rupture. Very small breaks cause expulsion of the reactor coolant at a rate which may be accommodated by operation of the charging pumps alone.
The double ended rupture of a main reactor coolant pipe remains the most severe of all of these accidents in terms of required operation of the engineered safety features system, and thus it is used together with a loss of auxiliary AC power as the basis for determining the requirements of the Emergency Diesel Generator capacity and, with a shutdown on the second unit, for determining the cooling water requirements, as described in Section 10.
8.4.4     Station Blackout A Station Blackout (SBO) exists when there is a Loss of Offsite Power (LOOP) and concurrent loss of both of a units Emergency Diesel Generator sources. An SBO is assumed to occur on only one Unit of a two unit site, in accordance with Reg. Guide 1.155. Prairie Island meets the SBO rule of 10CFR50.63 (June 21, 1988) and the related guidance of Reg. Guide 1.155 (August, 1988). Prairie Island is classified as a four hour plant (four hour SBO duration) based on criteria contained in Reg. Guide 1.155 and NUMARC-8700 (References 32 and 33). In accordance with Reg. Guide 1.155 and NUMARC-8700, it has been demonstrated by testing that alternate AC (AAC) from the non-SBO units Emergency Diesel Generator is available and the interconnecting bus ties can be manually closed within ten minutes of the realization that an SBO condition exists to provide power to the required loads on the SBO unit (References 34 and 35). Analysis has shown that the AAC has sufficient capacity to supply the required loads for the non-SBO unit plus the required loads of the SBO unit for the required four hour SBO duration (References 32, 33, and 36) and that adequate condensate inventory is available to provide decay heat removal for the four hour SBO duration (References 32, 33, and 37). Additional coping analyses for other plant systems are not required for the SBO unit per Reg. Guide 1.155 and NUMARC-8700 due to the alignment of AAC to the SBO unit within ten minutes of the realization that an SBO condition exists (References 32 and 33).

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-12 EDG Loading criteria:
Because of the low probability of either an SBO or DBA occurring, the simultaneous occurrence of a DBA and SBO is not credible. NUMARC 87-00 provides the loading criteria for an EDG in the non-SBO unit cross-tied to the SBO unit and requires the EDG to carry: (1) the loss of off-site power safe shutdown loads on the non-SBO unit, and (2) the SBO loads on the SBO unit for the required coping duration. Reference NUMARC 87-00 Appendix J Question and Answer B.3.
These loading conditions are analyzed in Reference 36 for each EDG and each EDG is found to be loaded within its continuous rating.
SBO Loads:
Typically during an SBO, once the power is available to the SBO unit through the bus ties, equivalent equipment would be operated in the SBO unit as under a LOOP.
Notable exceptions are that the SBO units EDG auxiliaries would not be operated, nor would the 121 Cooling Water Pump for a Unit 2 SBO. This condition is more conservative for the SBO unit than operating the essential SBO equipment as required by NUMARC because it includes more load than the essential SBO load.
8.4.5      Non-Safeguards Standby Diesel Generators Non-safeguards 4.16 KV Buses 31, 41, 32 and 42 are normally supplied from Normal Buses 13, 23, 14 and 24 and their offsite sources, respectively. Buses 31 and 41 serve 480V Buses 310 and 410 respectively which have bus ties to form a double ended load center. Similarly, 480V Buses 320 and 420 are supplied by 4.16KV Buses 32 and 42.
These 480V buses serve a variety of non-safeguards loads including plant process computers Uninterruptable Power Supplies, Non-safeguards station battery chargers, turbine generator AC auxiliaries, and miscellaneous Normal motor control center loads.
The Bus 31/41 Load Centers are backed up by diesel generator D3, and Bus 32/42 Load Centers are backed up by diesel generator D4.
Diesel generators D3 and D4 consist of General Motors Electromotive Division units which were converted from MP-45 peaking units to emergency standby service. They are rated 2500 KW continuous (2750 KW peak), 0.8 power factor, 900 RPM, 4.16KV, 3-phase, 60Hz. They are radiator cooled with closed cooling,and utilize DC electric starting motors. DC power for engine starting, field flashing, and control is supplied from 125V DC Non-safeguards Systems 31 and 42. The diesel generators are capable of being manually run and synchronized onto the Normal 4.16KV plant buses from their respective control panels in the 31/41 and 32/42 Bus rooms. They are normally left in auto standby with the coolant and lube oil partially heated with a keep-warm system.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.4-13 Both the 31/41 and 32/42 Load Centers have a load shedding and restoration scheme which will operate in the case that voltage is lost on a 480V bus. If both 480V buses in a load center lose power, then the diesel generator is given a fast start signal, source breakers are tripped, and the diesel comes up to speed and voltage after which the loads are sequenced back on the buses. Each diesel generator also has the capability to test the associated load-shedding and restoration scheme without actually tripping any loads.

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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.5-1 8.5     DC POWER SUPPLY SYSTEMS 8.5.1     Safeguards 125 Volt DC System The safeguards 125 VDC Electrical Power System for each unit consists of two independent and redundant safety related DC electrical power subsystems (Train A and Train B). 125 VDC Subsystems 11 and 12 serve Unit 1 and 125 VDC Subsystems 21 and 22 serve Unit 2. Each subsystem consists of one 125 VDC battery, battery charger, and associated distribution equipment. The configurations of the safeguards 125 Volt DC Systems for both Units are shown in Figures 8.5-1a, 1b, 2a, and 2b.
The 125 VDC Systems supply instrumentation, control, and motive power to safety related equipment. Redundant safety related equipment is divided between the two DC subsystems associated with each Unit such that loss of one DC subsystem does not affect redundant circuits.
The 125 VDC Systems and their components have a Safety Related quality assurance classification. The 125 VDC Systems are qualified to allow operation during and following a Safe Shutdown Earthquake. Specific components were tested or qualified for seismic events as described in Section 7.9.
The battery, battery charger, transfer switches and main panels for each of the 125 VDC Subsystems are located in their associated subsystems battery room. The four battery rooms are located in a Design Class I area of the Turbine Building on the 695 elevation as depicted on Figure 1.1-4. Two access routes per room are provided for personnel safety. The access between adjoining battery rooms is through openings in the reinforced concrete block walls. Each of these openings is furnished with a counterweighted gravity sliding Class A fire door provided with dual fusible links, one located on each side of the common concrete block wall. Fire dampers are provided in the ventilation ducts.
A detailed description of the safeguards 125 VDC Systems, including associated alarms, indications, procedures, maintenance, surveillance, and test procedures was provided to the NRC in Reference 20 in response to Generic Letter 91-06, Resolution of Generic Issue A-30, Adequacy of Safety Related DC Power Supplies.
8.5.2     Safeguards Batteries There are four safeguards batteries, one per 125 VDC Subsystem. The batteries temporarily assure a continuous source of DC electrical power to the DC System in the event of the loss of AC charging power until the AC power to the chargers is restored.
The batteries also assist with supplying DC loads when the associated charger cannot supply the total DC load.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.5-2 The batteries are flooded vented lead acid storage batteries. Each battery consists of 58 cells nominally. The batteries have a nominal rated capacity (to 1.75 volts per cell) of 1800 amp-hours at an 8 hour discharge rate.
One battery charger is in service on each battery so that the batteries are always at full charge in anticipation of a loss of AC power. This ensures that adequate DC power is available for starting the Emergency Diesel Generators and for other emergency uses.
Once AC power is restored to the battery charger, it will resume powering the DC system loads and charge the battery.
Each battery has been sized to carry expected shutdown loads following a plant trip, and a loss of AC battery charging power for a period of 1 hour without battery terminal voltage falling below the required minimum. For each battery system, the minimum terminal voltage is that required to maintain the operability of all components required to operate during a design basis event (Reference 21). Battery sizing determination was also done using the methodology of IEEE-485 as guidance and takes into account minimum expected electrolyte temperature and margin for battery aging (Ref. 21).
Major loads with their approximate operating times on each battery as well as minimum terminal voltage for each battery are provided in the referenced calculations (Ref. 21).
For Station Blackout, as discussed in section 8.4.4, Prairie Island is categorized as a four hour plant. However, Prairie Island has demonstrated that Alternate AC can be aligned within 10 minutes. Therefore, no coping assessment is required per NUMARC 87-00 Section 7.1.2. The safeguards 125 VDC battery on the SBO unit will provide DC power to support actions on the SBO unit for aligning the Alternate AC source to the SBO unit during the 10 minute timeframe and will power the one division of safeguards battery chargers. The battery sizing load profile stated in the previous paragraph bounds the battery performance load profile for Station Blackout.
8.5.3     Safeguards Battery Chargers There are five safeguards battery chargers, one per 125 VDC Subsystem plus one portable battery charger. The battery chargers are supplied from the associated safeguards 480 Volt AC System MCC. The battery chargers supply DC electrical power to the connected loads while maintaining safeguards batteries fully charged during normal operation when the AC charging power is available except as allowed by Tech Specs. During transient or accident conditions, the battery chargers are the primary source of DC power when AC charging power is available.
Each of the four stationary battery chargers has been sized to recharge its associated partially discharged battery from a voltage of 105 VDC within 24 hours, while carrying its normal load.
Each battery charger has a nominal rated DC output of 400 amps with an adjustable current limit set under 315 amps at 130 VDC. Both float and equalize voltage are adjustable. The charger supply rating is 90 amps at 480 VAC while supplying 300 amps.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.5-3 The battery chargers normally operate in float condition supplying power to the connected loads and charging power to their associated battery. Each battery charger has a three phase AC input circuit breaker and a two pole DC output circuit breaker.
The battery chargers function to give desired output regardless of whether the battery is connected. The rectifier section of the battery charger ensures that the AC supply system does not become a load on the battery.
One portable battery charger can provide backup service in the event that one of the four stationary battery chargers is out of service. If the portable battery charger is substituted for one of the stationary battery chargers, then the requirements of independence and redundancy between subsystems are maintained.
The battery charger AC input transfer switches and DC output isolation switches allow switching of the normal DC power source from the stationary battery charger to the portable battery charger. These AC input transfer break-before-make switches prevent paralleling the portable and the stationary battery chargers.
8.5.4     Safeguards Distribution Equipment The DC fused disconnect switches connect the battery to the Safeguards DC panels while protecting downstream loads from the potential fault current of the battery.
The DC load transfer switches allow switching the power sources to selected loads from the 125 VDC Subsystem of one Unit to the same train subsystem on the other Unit.
These are break-before-make switches so that it is not possible to parallel the DC subsystems of both units during switching operations.
The main distribution panel for each DC subsystem provides power to loads throughout the plant.
8.5.5     Instrumentation, Controls, and Alarms Control room alarms are provided for 125 VDC System grounds, undervoltage, fire doors, special exhaust fans, and general trouble. In addition, control room alarms and status indication are provided for several 125 VDC System parameters on the Plant ERCS.
Local indications for battery amps and panel volts are provided in each battery room.
The system operates ungrounded with ground fault detectors provided. With this type of arrangement, two grounds are required (one in the positive line and one in the negative line) before any of the system protective devices would operate. Occurrence of a ground of either polarity of sufficient magnitude, will cause control room alarm. This provides an opportunity for trouble-shooting.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 36 Page 8.5-4 8.5.6   Battery Room Special Exhaust Fans The Battery Room Special Exhaust Fans (Unit 1: 11 and 12; Unit 2: 21 and 22) provide exhaust flow from the Battery Rooms to prevent the buildup of a combustible concentration of hydrogen gas in the battery rooms. The two fans for each Unit operate in parallel drawing exhaust through a common duct from the Units two battery rooms and discharging into a common duct which exhausts to the atmosphere. The battery room special exhaust fans are not required for accident mitigation.
8.5.7   Inspection and Testing The station batteries and other equipment associated with the battery systems are 604000000210 accessible for inspection and testing. Battery and Battery charger maintenance, surveillance testing, and discharge testing is performed in accordance with Battery Monitoring and Maintenance Program and the plant Tech Specs.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 32 Page 8.6-1 8.6    INSTRUMENTATION AND CONTROL AC POWER SUPPLY SYSTEMS The configurations of the Instrumentation and Control AC Power Supply Systems for both Units are shown in Figures 8.5-1a, 1b, 2a, and 2b. Each Unit has four inverters that each supply one Panel that is dedicated to one Reactor Protection and NIS Channel. These Panels are also referred to as Instrument Buses. Each Unit also has two inverters that each supply one Panel that is dedicated to one train of Event Monitoring and other critical loads.
Each inverter contains an associated rectifier permitting the inverter to be normally fed 01316490 from an AC source with instantaneous non-interrupted transfer to the DC system on loss of rectifier or AC supply.
Power supplied to the Instrument Buses is provided by the uninterruptable power supply (ups) which includes an automatic static transfer switch and a manual bypass switch in addition to the inverter. The automatic static transfer switch is designed to transfer the Instrument bus load from the inverter, if it fails, to the AC source through a bypass breaker.
The availability of control power to the engineered safety features trip signals is continuously indicated by means of indicating lights on the engineered safety feature panels and loss of control power for the engineered safety features actuation signals is annunciated in the control room.
A 3-phase 208/120 Volt AC minimum interruptible bus is provided on each unit. This bus is identified as Panel 117 on Unit 1 and Panel 217 on Unit 2. These panels are fed from a 480 Volt safeguard bus via a safeguard MCC. Various important AC instrument and control loads that can tolerate an infrequent short interruption (approximately 10 seconds) are fed from these Panels. Inverter loads are transferred to these panels when the inverter fails or must be removed from service for maintenance.

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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-1 8.7      CABLES AND RACEWAYS 8.7.1      Cable Derating Current ratings of all the cables used in this plant are based on the values specified for the type of cable used, by IPCEA, NEC, or by the individual cable manufacturer. Power cables are installed in ladder type cable trays. They are installed with only a single layer of cables per tray and clamped in the ladder to ensure that a specified spacing exists between these cables to ensure that air cooling is available. Alternatively, the manufacturers cable derating based upon random fill is utilized, and the cable installation maintains spacing which provides margin from the assumed random fill.
Control cables are grouped in the trays with random lay, and the ampacity rating for these cables is based on the load of the control circuits involved. NEC derating factors are appropriately applied for multiple conductors in conduit, or multi-conductor cables in tray.
All original construction Power Control and Instrument Wire and Cable used on safeguards related circuits in the plant was purchased and qualification tested from manufacturers certifying that the insulation used on these conductors, including splicing material, would perform satisfactorily and not be appreciably degraded when exposed to the following environmental conditions:
Normal Temperature (40 years)         90&deg;C (194&deg;F) conductor temperature Emergency Temperature (48 hours)      138&deg;C (280&deg;F)
Pressure                              46 psig Relative Humidity - Normal            70%
Relative Humidity - Emergency         100%
Radiation                             5 x 107 Rads Containment Spray                     Dilute solution of Boric (Acid 2000 - 3000 ppm of Boron) adjusted to pH of 9.0 to 9.5 with Sodium Hydroxide Fire                                  Successfully pass the so-called Philadelphia Electric Flame Test or its equal.
Cables, relays, and control devices supplied by P.S.&E were temperature qualified as follows:
: a. Cable and wire - 280&deg;F (138&deg;C) - tested for a minimum of two hours at this figure.
: b. Relays and control devices - 178&deg;F (70&deg;C).

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-2 All new cable installed after original construction is qualified for the environment it is used in.
8.7.2     Cable Routing The following categories are those to which the term Power Cable shall apply:
4160 volt feeders 480 volt feeders 120/208 volt main feeders and motor feeders 125 volt DC main feeders and motor feeders 125 volt DC subfeeders that are rated 30 ampere or higher The following categories are those to which the term Control Cable shall apply:
120 volt AC and 125 volt DC metering 120 volt AC and 125 volt DC relaying 120 volt AC and 125 volt DC interlocking, indication and controls 120 volt AC and 125 volt DC annunciation 125 volt DC subfeeders with a continuous rating of 25 amperes or less The term Instrumentation Cable shall apply to all cables that are used for low level circuits. The following categories are some of the areas to which this will apply:
Computer input and output signals Thermocouples RTDs Nuclear instrumentation and monitoring Electronic control and recording devices Transducer output signals Mixing of power cables with control or instrument cables in the same tray is not permitted. Whenever a control and/or instrument cable tray and a power tray are in the same stack, the power tray is located in the top tier. Non-safeguard trays installed in stacks are spaced vertically with a minimum of 12 bottom to bottom in all areas.
However, Class IE trays have a minimum bottom to bottom dimension between trays of 15 or 36, depending on adjacent groupings. Class IE trays containing instrument, control, or power cables have a minimum horizontal separation between redundant circuits of 36. Redundant circuits are not permitted in the same tray or conduit. If closer spacing than 36 cannot be avoided an approved barrier must be placed between the circuits. Cable trays are routed to avoid a fire hazard area, such as oil storage rooms, oil tanks, etc., whenever possible. When this cannot be done, the cable tray system is protected by fire resisting barriers. Whenever possible, a wall or floor has been introduced between trays carrying redundant safeguard circuits.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-3 Class IE cables for each of the two units in the plant are divided into six(6) basic groups consisting of the four Reactor Protection/NIS (colored) Channels and A and B redundant trains. Minimum spacing between these groups are maintained as follows:
: 1. Redundant A & B Trains                 -36 Horizontally (tray rail to tray rail) and Vertically (tray bottom to tray bottom)
: 2. Reactor Protection/NIS Channels        -36 Horizontally (tray rail to tray rail) and Vertically (tray bottom to tray bottom)
: 3. Spacing Between any Reactor            -36 Horizontally (tray rail to tray Protection/NIS Channel and any        rail) and 15 Vertically (tray redundant A or B Train                bottom to tray bottom)
In items 1, 2, and 3, horizontal dimensions indicate clear air space between adjacent side rails. Vertical dimensions are tray bottom to tray bottom.
In item 3, redundant channels and trains are as follows:
Train A and the White and Blue Instrument channels, are redundant to Train B and the Red and Yellow Instrument channels.
In item 3, minimum clear air spacing between bottom of upper tray and top of lower tray is 9 which allows a maximum 6 tray siderail for the 15 vertical spacing. This minimum vertical spacing would also apply between a Class IE Tray and a Non-Safety System Tray.
Lack of separation between a single train and any one channel of Reactor Protection/NIS is allowed as long as the channel has the same power supply as the train. There must not be a lack of separation such that both trains, two channels, or one train and two channels are affected by an uncleared fault.
Where separation is not attainable, protective barriers are provided.
Barriers are required where mutually redundant trays cross. The barriers extend to each side of the protected tray by a distance equal to approximately three times the widest tray involved in either system. Barriers are provided in areas where non-safeguard trays may cause common mode involvement between two or more mutually redundant safeguard systems, and the mutually redundant trays are not separated by more than three times the sum of the widest trays involved in each interaction.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-4 Cable and raceway separation and segregation within the D5/D6 Building and Fuel Oil Storage Area conform to the requirements of IEEE 384-1981 as modified by NRC Regulatory Guide 1.75. Deviations from the requirements contained in those documents are shown to be acceptable and meet the intent of IEEE 384/RG 1.75 through analysis. Cable and raceway interconnections between the D5/D6 Building and existing plant facilities, including direct buried cable, duct runs and other raceway systems, as well as all cables and raceways routed within existing plant facilities, are separated and segregated in accordance with the requirements contained in the balance of this section as a minimum.
Safety related Train B cables are routed from the D5/D6 Building to the plants Class I corridor through the Turbine Building, a Class III structure. These cables are enclosed in a steel structure to afford them Class I protection. This enclosure is designed as a Class I structure and provides protection from seismic and jet impingement forces.
Analysis addressed other concerns, such as cable derating (8.7.1), tornado winds, missiles and fires.
8.7.3    Cable Tray Sharing Every effort has been made to install safety related cables in their own trays. However, there may be isolated cases where non-safety related cables may be installed in the same trays with safety related cables. Non-safety related cables are not routed with cables of one safety-related system and then routed through its mutually redundant system.
8.7.4    Fire Protection 01484954 Fire Protection is discussed in Section 10.3.1.
8.7.5    Cable and Cable Tray Markings Each tray section of the cable tray system has an identifying code indicated on the drawings and the same identification is stenciled on the tray after it is installed. This stenciling is applied on each section of the tray whenever the code changes. Any tray that is continuous through walls or floors has the identifying code stenciled on both sides of the wall or floor. Cable trays assigned to safety related circuits are also color coded. This coding is accomplished by a strip of colored plastic tape 2 wide by approximately 3 long affixed to the tray near the stencilled identifying number.
Conduits carrying safety related conductors are similarly color coded with a wrap of colored tape affixed to each end of the conduit and on either side of the wall or floor it passes through. Straight portions of the conduit have this tape affixed at suitable intervals. Each multi-conductor control or instrument cable has a 1 diameter brass identifying tag at each end carrying the cable number, which is affixed on to the outer jacket of the cable.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-5 Safety related control cables have a colored strip applied to the jacket approximately 1 foot long at intervals of approximately 10 feet.
Cable color coding consists of 6 colors, based primarily on 6 sources of electrical supply.
The first two supplies consist of Train A and Train B. This may be 4160V AC, 480V AC, 240V AC, 120V AC or 125V DC. These AC supplies are fed directly from either offsite sources or Emergency Diesel Generators D1 and D2 for Unit 1, and from D5 and D6 for Unit 2. The DC Sources are fed from 125 VDC systems 11 and 12 for Unit 1, and from 125 VDC systems 21 and 22 for Unit 2.
The remaining 4 supplies consisting of 120V AC for instrument and reactor protection channels are fed from 4 separate inverters.
All cables associated with safeguards related equipment are color coded.
: a. Train A supplies and controls are color coded Orange.
: b. Train B supplies and controls are color coded Green.
: c. Reactor protection and nuclear instrumentation systems (supply and control) listed as Channel I are color coded Red.
: d. Reactor Protection and N.I.S. (supply and control) listed as Channel II are color coded White.
: e. Reactor Protection and N.I.S. (supply and control) listed as Channel III are color coded Blue.
: f. Reactor Protection and N.I.S. (supply and control) listed as Channel IV are color coded Yellow.
Power Supplies to the 4 inverters must originate from either Train A or Train B, White and Blue inverters are fed from Train A sources (either AC or DC) and Red and Yellow inverters are fed from Train B sources (either AC or DC).
If an engineered safeguards circuit is either Train A or Train B it can be easily distinguished from a reactor protection channel due to color coding.
If the circuit in question is an instrument channel entering a logic matrix with 2 or 3 other similar channels to form two safeguards action trains (A or B) by means of 2 out of 3, 2 out of 4, or similar logic means, that channel bears the same color code as the instrument bus (inverter) supplying it. AMSAC AFW actuation logic takes exception to this criteria, due to its required diversity of power.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-6 Color coding is not intended to spell out the individual usage of each cable. The metal tag at the end of each cable carries a number distinctive to that one cable and by checking drawings this number can be used to find the exact usage of each cable.
Color coding was established as an easy means of maintaining the specified separation between 6 systems or sets of control, namely Train A, Train B and 4 instrument channels.
8.7.6      Relay Room Arrangement The Safeguards Relay Racks and Reactor Protection Relay Racks are located in the Relay Room. The Safeguards and Reactor Protection Relay Racks are separated into A train and B train groups. Each train is in a common line-up with an approximate 5-0 aisle between groups.
The cable routing in this room is primarily in cable trays. The separation provided is in accordance with the previously stated separation criteria, except that one train is not allowed to interact with one channel even if the channel has the same power supply as the train.
8.7.7      Panel Wiring Separation Control board switches and associated lights are furnished in modules. Modules provide a degree of physical protection for the switches associated lights and wiring.
The control board layout is based on making it easy for the operator to relate the control board devices to the physical plant and to determine at a glance the status of related equipment. This is referred to as providing a functional layout. Within the boundaries of a functional layout, modules are arranged in columns of control functions associated with separation trains defined for the Reactor Protection and Engineered Safeguards Systems. Teflon covered wire is generally used within the module and between the module and the first termination point.
The interface between the control board wiring and field wiring is made in terminal board cabinets one level below the control board. Teflon covered cables with connectors are provided for control board to terminal board cabinet interconnection.
These cables are secured to metal supports to ensure separation of the cables consistent with the separation afforded by the front panel layout.
Redundant components are located in separate racks which are shown on Figure 7.8-1, which also shows the general arrangement of the control room.
Separation between redundant relay and terminal block cabinets is accomplished by using a separate cabinet for each train of components. Where redundant cabinets are placed side by side, the solid metal side walls of each cabinet provides the separation requisite.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-7 Redundant Local Racks, Panels, and Control Stations used with Safeguards Systems are either separated by 3 feet of air space or an appropriate barrier is placed between the redundant components.
Instruments used with Safeguards Systems are either separated by a minimum air space of 36 between mutually redundant devices or are mounted on independent racks separated by a minimum clear air space of 36.
Cables entering redundant Local Racks, Control Stations Instrument Stations, Relay Cabinets, and Terminal Cabinets are designed to meet Cable Separation Criteria discussed in Section 8.7.2 Cable Routing.
Control Modules on the Control Boards in the Main Control Room, have a minimum center-to-center separation of 4-1/2. Such controls are completely enclosed in a Fire Resistant housing. Cables are connected to these modules with plug-in metal connectors and the cables are insulated and jacketed with Teflon. The criteria for minimum separation between redundant cable is 4-1/2 except in cases where redundant cables enter the same Control Module where center-to- center separation is 3-1/4 and except for cases of reduced separation that have undergone technical evaluation (Reference 13).
Panels containing safety related components have redundant counterparts located in separate cabinets or isolated areas within cabinets. This includes such devices as 4160 V undervoltage transfer relays and automatic permissive starting sequence relays; emergency diesel generator protection and control relays; D.C. Distribution Panels; and Terminal Block Panels for redundant safety related wiring to main control board.
8.7.8    Electrical Penetrations Electrical penetrations entering the Reactor Building are subdivided into 6 basic groups:
Approx. Dimensions:
9  9  54  9                       9 A           B          C            D           E             F Each of the six groups has provision for 12 penetrations. The configuration in each group is three wide by four high. Each penetration in each group is spaced 2-0 center to center from any penetration in its group.
Groups A, B and C are located in one quadrant of the containment vessel with groups D, E, and F located in another quadrant approximately 54-0 apart.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-8 Each group of penetrations in each quadrant is separated by a distance of approximately 4-0 to any adjacent penetration in any other group.
Each penetration in a group has a specific circuit function, e.g., Nuclear Instrumentation, Instrumentation and Control, Low Voltage Power, and Medium Voltage Power. In addition, each group of penetrations is assigned an Engineered Safeguards Train and Reactor Protection Channels as follows:
Group A - Normal circuits Group B - Normal and Channel II circuits Group C - Normal, Train A and Channel III circuits Group D - Normal, and Train B circuits Group E - Normal, Train B and Channel I circuits Group F - Normal, Train B and Channel IV circuits Cables passing through the air annulus between the reactor building and the containment building are segregated into the six basic groups as shown above and the same relative spacing between the six groups is maintained, as the cables pass through this air annulus.
When control and instrumentation connections between cables within the containment and the penetration connections are made at terminal blocks, exposed connections are covered with environmentally qualified materials suitable for the LOCA environmental conditions.
8.7.9     Annulus Cable Supports All electrical cables in the annulus are provided with support systems of various methods.
Generally, the cables are supported by tiers of cable trays that are supported by structural members bearing on the external support concrete and tied back to the shield building. Power cables are clamped to the cable tray system with enough slack allowed at both ends so as to accommodate differential movements between the two buildings without interaction. Control cables are not clamped to the cable tray system and slack has been allowed at both ends.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.7-9 The large 5000 volt cables used for the reactor coolant pump are supported somewhat differently. A supporting framework is clamped to the penetration nozzle (part of the containment vessel) to provide a rigid support for the cables at the outboard end of the porcelain bushings. The cables have approximately 18 of slack prior to entering the embedded conduit in the shield building.
Annulus lighting system cables are all fully supported in conduit, which is fastened only to the shield building by clamps.

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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-1 8.8      INSPECTION AND TESTING Historic Background for Class I Electric Equipment:
Inspection and testing at vendor factories and/or during construction were conducted to demonstrate the following on all Class I electrical equipment:
: a. All electrical assemblies operate within their design ratings;
: b. All components are properly mounted;
: c. All metering and protective devices are properly calibrated and function correctly;
: d. All connections are properly made and the circuits are continuous.
Operational testing of the normal and standby power systems were conducted under conditions which simulate the loss of offsite power conditions. This testing demonstrated the following:
: 1. All essential loads can be operated in the proper sequence for each Design Basis Accident condition with normal power for essential loads available;
: 2. The relaying and control system can detect a loss of external power and, with the buses dead, start and load the standby power sources;
: 3. The standby power sources can provide sufficient power for an adequate time interval.
Historic Background for D1/D2 Qualification and Testing:
The essential requirements of generator sets for nuclear power plant protection include positive start, rapid acceleration and load acceptance with acceptable voltage drop and fast recovery to rated voltage. To obtain more information related to these requirements with the 3000 KW Unit 1 emergency diesel generator sets (D1 and D2), the following tests were conducted:
: a. Start, Parallel and Load Acceptance Arrangements were made to isolate a block of power house engines and suitable resistive load from factory operations for these demonstrations.
Automatic equipment was set up to synchronize the test generator set with the power house engines. The synchronizer signal simultaneously opens the power house engine breakers, and closes the test generator set breaker connecting 3000 KW resistive load.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-2
: b. Motor Starting Motor starting tests included:
: 1. Across line starting 2000 HP motor
: 2. Across line starting 1250 HP motor
: 3. Across line starting 2000 HP and 1250 HP motors simultaneously
: 4. Across line starting 2000 HP and 1250 HP motors with 1000 KW initial resistive load.
: 5. Simultaneous start of 3000 KW generator set and 2000 HP motor
: 6. Simultaneous start of 3000 KW generator set and 1250 HP motor
: 7. Simultaneous start of 3000 KW generator set, 1250 HP motor and 2000 HP motor
: 8. Locked rotor tests of 2000 HP and 1250 HP motors.
Demonstrations of motor start capabilities were conducted with unloaded motors. However, it is believed that the data obtained permits accurate prediction of starting similar motors with specified loads.
: c. Instantaneous Overload Capability With the engine producing 3000 KW on a resistive load bank, an additional 1000 KW resistive load was added for 7-1/2 seconds duration. These demonstrations showed that the system would accept the additional load and recover to rated frequency and voltage during the overload condition. The purpose of this demonstration was to show capability of accepting overload surges which may occur when a large motor locks in during the starting cycle.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-3
: d. Reliability Test Test information for the Prairie Island Unit 1 Emergency Diesel Generators consists of the information obtained from the prototype tests performed in the manufacturers plant on September 13 and 14, 1968. The various tests performed are the same as those listed in b. above. The first test consists of cross-the-line starting of a 2,000 horsepower motor. Test figures indicated that at initial inrush the voltage dipped to a figure approximately 55% of normal. The locked rotor KVA of this 2,000 horsepower motor was approximately 11,000 KVA. The manufacturers curves supplied with the Prairie Island generator indicates that for a starting KVA of 11,000 the voltage dip can be expected to reach 50% of rated. Calculations for the Prairie Island diesel generators indicate that the initial in-rush seen on either generator is approximately 6,800 KVA and is the worst condition.
Curves for the D1/D2 generators indicate that for an inrush of 6,800 KVA the initial voltage dip will be to approximately 62% of normal and will recover to 100% of normal within 1-1/2 seconds. The inrush KVA imposed on the factory engine during the prototype test was approximately 1-1/2 times that calculated for the Prairie Island engines. Because the prototype tests indicated that a larger load than anticipated at Prairie Island could be safely started and brought up to speed, and no difficulties were expected with the Prairie Island engines.
Another of the tests performed on the prototype consists of cross-the-line starting of both a 2,000 and a 1,250 horsepower motor. This represents an in-rush of approximately 18,000 KVA. Voltage dip at this point was approximately 40% of rated and full recovery to normal voltage was delayed until the in-rush reduced to approximately 8,000 or 9,000 KVA. The test indicated the motors could be started and accelerated to speed. Testing as indicated was more severe than anything that can be predicted for the Prairie Island units.
In addition to the performance requirements of a satisfactory nuclear power plant protection system, reliability is an extremely important aspect. To prove the generator set, arrangements were made to demonstrate its reliability.
The generator set was direct connected to a water rheostat. The system was adjusted to 3000 KW load and suitable controls attached to effect the following sequence:
: 1. Start unit and accelerate it to rated speed and load.
: 2. Maintain 3000 KW load for five minutes.
: 3. Stop generator set without an idling or cooling off period.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-4
: 4. Allow to stand for 1 hour, 55 minutes permitting temperatures to drop to the keep warm level.
: 5. Repeat 1, 2, 3, and 4 above through 100 consecutive cycles.
The prototype unit started each time with no failures. Each start was accomplished in 10 seconds or less. At end of the test, the unit was disassembled for inspection and was found to be in excellent condition.
Based on these 100 successful starts the probability of success (reliability) in starting the Emergency diesel generator within 10 seconds after initiation of the Start Signal is calculated to be 0.977 at a 90% confidence level. See Figure 8.8-1.
The Confidence Level is the probability that the calculated reliability is no less than the actual reliability. In other words, an increase in confidence level will add conservatism to the calculated reliability. This is necessary since the failure data sample is small (no failures in 100 starts). Also, the Calculation (r=e-t, =Failure Rate, t=Mission Period or Cycle, t=Failures/Test) was based on the exponential distribution of failures. This was an acceptable assumption until sufficient failure data is obtained which proves that the failures fit a distribution other than the exponential distribution.
Additional failures per start data were accumulated during the weekly emergency diesel generator tests. Starting each of the two diesel generators once a week accumulated an additional 200 starts in 23 months. This added to the 100 prototype engine starts represents data accumulated on 300 starts.
The acceptance test consisted of a 100 hour run at full (3000 KW) load.
Subsequent plant tests were run to establish that the total and incremental blocks of load could be adequately started and maintained.
These tests have established the reliability and capability of the emergency diesel generators to provide their design function.
The Auxiliary Electrical System is tested at regular intervals during the life of the plant to demonstrate the capability of the system to provide sufficient power to the essential loads.
Since the emergency diesel generators are utilized as standby units, readiness is of prime importance. Readiness can best be demonstrated by periodic testing which, insofar as practical, simulates actual emergency conditions. The testing program is designed to test the ability to start the system as well as to run it under load for a period of time long enough to bring all components of the system into equilibrium conditions, to assure that cooling and lubrication are adequate for extended periods of operation. Full functional tests of the automatic circuitry are conducted on a periodic basis to demonstrate proper operation.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-5 If the number of tests were increased to possibly 300, it was felt that the calculated reliability could be raised to 99% based on an anticipated failure rate of two or three in 300 starts.
Northern States Power Company accumulated this additional failures per start data on D1/D2 during the initial preoperational and startup test phase of Prairie Island Unit #1 startup. This data when added to the 100 prototype engine starts represents data accumulated on 300 starts.
The Unit 1 emergency diesel generator preoperational testing program included tests that:
: 1. Verified that the diesel generators control, power and auxiliary systems can be normally maintained at a ready operating condition.
: 2. Verified that the various control switches in the diesel generator rooms activate the engine stopping relay.
: 3. Verified that the diesel operators can be started and controlled from the diesel generator rooms.
: 4. Verified that the diesel generators can be started and controlled manually from the control room G-1 panel.
: 5. Verified that the diesel generators automatically trip from the various engine trip signals and the alarms do occur, but does not trip from these signals if the MCA relay is closed.
: 6. Verified that the diesel generators can be paralleled with the NSP interconnected system and operated at various loads for a two week period.
This test also included fuel consumption tests.
: 7. Verified that the diesel generators can carry a load of 3250 kilowatts for 30 minutes.
: 8. Verified that the diesel generators start when initiated by the undervoltage relay scheme on each 4160 volt bus to which the diesel generator is connected.
: 9. Verified that the diesel generator performance upon loss of the largest single load during emergency operation, does not adversely affect either of the diesel generators. These tests involved loading the diesel generators as outlined in Table 8.4-1 of FSAR Amendment 19, tripping of the largest single load, and measuring the voltage and frequency disturbance. This test also verified the proper loading sequence and include pumping of water to the vessel with the RHR pumps and the safety injection pumps.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-6 The above tests were part of the Preoperational (Preop) Test Program for D1/D2 and the results are available in the Prairie Island Plant Preop Test File. All subsequent starting and testing is documented and becomes part of the plant surveillance file.
Historic Background for D5/D6 Qualification and Testing:
The Unit 2 Emergency Diesel Generators (D5/D6) underwent the following factory tests conducted by the manufacturer, SACM. This testing fulfilled the requirements for qualification testing delineated in Reg Guide 1.9, December 1979, and IEEE-387 with two principle exceptions, discussed in NSPs letter of September 29, 1989 (Reference
: 5) to the NRC, and accepted by their letter of January 31, 1990 (Reference 7). The first exception is utilizing portions of the 1984 edition of IEEE-387 instead of the 1977 edition invoked by Reg Guide 1.9. The second was 70 start and load acceptance tests, (item
: b. below) in place of the prescribed 300. The basis of this lesser number of start tests is summarized in item d. below.
: a. Load Capability Test The genset was started and run until system temperatures were at equilibrium. The generator set was then loaded to 110% of nameplate load for a continuous period of two hours. The generator set was then loaded to 100% of nameplate load (5400KW) for a continuous period of twenty two hours. Finally, the generator set was tested for loss of load transient response, which verified that engine overspeed values remained within acceptable parameters.
: b. Start and Load Acceptance Test The genset was started thirty times at standby temperatures and five times at normal operating temperatures. The diesel generator set was required to start and reach operating speed within ten seconds for this test and was step loaded to 50% of the continuous rating.
Each diesel generator set was subjected to one simulated loading sequence, using appropriate combinations of motor and resistive loads. Motors with horsepower ratings of 250, 750, and 1000 HP were used in combination to closely match the values for each sequence step load. Loading was continued until the 5400 KW generator load rating was reached. The generator set then underwent a loss of 100% load test with voltage and frequency monitored during the transient.
: c. Margin Test The diesel generator set underwent two margin tests, each consisting of start, acceleration, and step loading to a value at least 10% larger than the largest step load. A step loss of this load was then initiated, with voltage and frequency monitored during the transient.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-7
: d. Reliability Test For the type of diesel generator set utilized for Prairie Island Unit 2, SACM applied extensive qualification testing for other nuclear sites. The results of this type testing included:
: 1. over 600 successful test cycles (start and load) without a failure,
: 2. over 1500 successful starts without a failure, and
: 3. over 100 starts with various subsequent loading profiles successfully applied.
This extensive testing, in conjunction with the factory testing described above, demonstrated the ability of the diesel generator sets to reliably start and carry load under required conditions. The high operational reliability of these generator sets and low failure rate (1.25 x 10 -3/hour) support the qualification of this design for emergency use at Prairie Island.
Site testing implemented the guidance of Reg Guide 1.108, August 1977, as outlined in NSPs letter of September 29, 1989 (Reference 5), including repeat of the factory 24-hour load run. The Unit 2 diesel generator preoperational testing program included tests that:
: 1. Demonstrated proper startup operation by simulating loss of all AC voltage and demonstrating that the diesel generator set could start automatically and attain the required voltage and frequency within acceptable limits.
: 2. Demonstrated proper operation under design accident loading sequence with voltage and frequency maintained within acceptable limits.
: 3. Demonstrated full load carrying capability for 24 hours of which 22 hours was at a load equivalent to the continuous (100% nameplate) rating of the diesel generator, and two hours was at a load equivalent to 110% of nameplate rating. This test, in conjunction with others, also verified proper operation of the cooling system.
: 4. Demonstrated proper operation during load shedding, including loss of the largest single load, and a complete loss of load, without exceeding voltage transient requirements and overspeed limits.
: 5. Demonstrated functional capability at full load temperature conditions by rerunning test one and two immediately following test three above.
: 6. Demonstrated the ability to synchronize with offsite power while connected to the emergency load, transfer this load to offsite power, isolate and return the diesel generator to standby status.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 28 Page 8.8-8
: 7. Demonstrated proper performance while switching from one fuel oil supply to another.
: 8. Demonstrated the capability to supply emergency power within required time was not impaired during periodic testing.
: 9. Demonstrated required reliability by performing 35 consecutive starts for each generator set.
: 10. Demonstrated proper functioning of the load sequencers under simulated emergency conditions to trip load breakers, start the diesel generators, select proper source for the emergency bus, and sequentially load the bus.
A loss of power memory test was also performed on the programmable logic controller (PLC) to verify proper resumption of operation upon restoration of power to the PLC.
: 11. Verified air start cranking capacity to crank the diesel engine at least five times without recharging the air receiver.
The above tests and results are maintained in the Prairie Island plant files.
Periodic testing and surveillance of the diesel generators are performed in accordance with the requirements contained in the Technical Specifications. The tests specified for the diesel generators will demonstrate their operability and continued capability to start and to carry rated load. Each Emergency Diesel Generator is required to meet a target reliability of 97.5% as determined by NUMARC 87-00, Appendix D, Rev. 1.
04-022

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 33 Page 8.9-1 8.9     ENVIRONMENTAL QUALIFICATION OF SAFETY-RELATED ELECTRICAL EQUIPMENT The Equipment Qualification Branch of the Office of Nuclear Reactor Regulation, Nuclear Regulatory Commission (NRC), has required all licensees of operating reactors to submit a re-evaluation of the qualification of safety related electrical equipment which may be exposed to a harsh environment. This requirement was implemented primarily by the issuance, on January 14, 1980, of IE Bulletin No. 79-01B (Reference 8) with subsequent clarifying supplements in February, September, and October, 1980.
The Bulletin required that a master list of safety related systems and equipment be generated, all accident service conditions be defined, and the equipment be evaluated in accordance with guidelines in the bulletin.
Northern States Power Company has provided responses to the Bulletin in March, May, July and October 1980. The October 31, 1980 (Reference 9) submittal represented the final response to IE Bulletin No. 79-01B. This response included revised system component evaluation worksheets and provided a complete and current Master List.
On May 22, 1981, the NRC issued the Prairie Island Nuclear Generating Plant Safety Evaluation Report (SER) (Reference 10) which summarized their assessment of the March, May, July and October 1980 submittals. A response to IE Bulletin No. 79-01B SER was submitted to the NRC in a {{letter dated|date=August 26, 1981|text=letter dated August 26, 1981}} (Reference 11). This submittal includes a detailed response to the NRC evaluation and provides documentation of the Equipment Qualification Program that is being undertaken by Northern States Power Company. The program ensures that all safety related equipment is capable of performing its safety related function during postulated accident conditions.
A follow-up submittal was made to the NRC on April 30, 1982 (Reference 12). This submittal included a revised Master List and Component Evaluation sheets reflecting updated qualification information and newly identified components, qualification information for TMI Action Plan equipment and a list of outstanding items and schedule for completion. On August 27, 1982, information regarding pressure and temperature profiles outside containment in relation to the environmental qualification review was submitted in response to an NRC request (Reference 14).
On April 25, 1983, the NRC issued a Safety Evaluation for environmental qualification of safety-related electrical equipment which summarized their assessment of the August 26, 1981, February 1, April 21, and April 30, 1982 submittals (Reference 15). A response to this SER dated Nov. 23, 1983 summarized the status of deficiencies noted in the April 25, 1983 safety evaluation.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 33 Page 8.9-2 On January 21, 1983 the NRC published in the Federal Register the final rule on environmental qualification of electric equipment important to safety for nuclear power plants. The rule became effective on February 22, 1983. This rule superseded all previous NRC requirements for environmental qualification of electrical equipment.
This rule, Section 50.49 of 10 CFR 50, specifies the requirements for environmental qualification of electrical equipment important to safety located in a harsh environment.
In accordance with this rule, equipment for Prairie Island may be qualified to the criteria specified in either the DOR guidelines or NUREG-0588, except for replacement equipment. Replacement equipment installed subsequent to February 22, 1983 must be qualified in accordance with the guidance of Regulatory Guide 1.89, unless there are sound reasons to the contrary.
A meeting was held with the NRC on December 1, 1983 to discuss all remaining open issues regarding environmental qualification, including acceptability of the environmental conditions for equipment qualification purposes. Discussions also included general methodology for compliance with 10 CFR 50.49, and justification for continued operation for those equipment items for which environmental qualification was not yet completed. The minutes of the meeting and proposed method of resolution for each of the environmental qualification deficiencies are documented in Reference 16.
The proposed resolutions for the equipment environmental qualification deficiencies, identified in earlier correspondence are described in Reference 15. During the December 1, 1983 meeting, the staff discussed the proposed resolution of each deficiency for each equipment item and found the NSP approach for resolving the identified environmental qualification deficiencies acceptable. The majority of deficiencies identified were documentation, similarity, aging, qualified life and replacement schedule. All open items identified in the SER dated April 25, 1983 (Reference 15) were also discussed and the resolution of these items were found acceptable by the NRC Staff.
The methodology used to determine compartment pressure and temperature profiles is described in USAR Appendix I.5.3 (Compartment Pressure and Temperature). Peak pressures and temperatures in principal compartments are identified, and referenced calculations provide peak values in other Auxiliary Building compartments as well as long-term pressure and temperature time histories.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 33 Page 8.9-3 Regulatory Guide 1.183, Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors, provides guidance to licensees of operating power reactors on acceptable applications of ASTs; the scope, nature, and documentation of associated analyses and evaluations; consideration of impacts on 01406407 analyzed risk; and content of submittals. This guide establishes an acceptable AST andidentifies the significant attributes of other ASTs that may be found acceptable by the NRC staff. This guide also identifies acceptable radiological analysis assumptions for use in conjunction with the accepted AST. This RG states that licensees may use either the AST or the TID-14844, Calculation of Distance Factors for Power and Test Reactor Sites, assumptions for performing the required environmental qualification analyses to show that the equipment remains bounding. RG 1.183 further states that no plant modifications are required to address the impact of the difference in source term characteristics (i.e., AST versus TID-14844) on environmental qualification doses.
As part of implementing AST, Prairie Island will continue to use the TID 14844 methodology to determine radiation doses in the EQ analyses.
Three categories of electrical equipment were identified in 10 CFR 50.49 as requiring environmental qualification. Equipment described in paragraph (b)(1) of 10 CFR 50.49 has been identified through a review of the accident analyses provided in the FSAR, a review of the emergency procedures, a review of safety system flow diagrams and Q-List, and a review of the installed equipment locations with respect to postulated harsh environmental zones. Our current master equipment list includes all equipment within the scope of paragraph (b)(1) of 10 CFR 50.49.
Equipment identified in paragraph (b)(2) of 10 CFR 50.49 is non-safety-related electrical equipment whose failure could prevent accomplishment of safety functions of equipment identified in paragraph (b)(1) of 10 CFR 50.49.
This equipment was principally identified through system review criteria and identification of display instrumentation referenced in the LOCA and HELB emergency procedures. The methodology used is summarized below:
The wiring diagrams of safety related electrical equipment as defined in paragraph (b)(1) of 10 CFR 50.49 were reviewed to identify any auxiliary devices, electrically connected directly into the control or power circuitry, whose failure due to postulated environmental conditions could prevent the required operation of the safety-related equipment.
The review discussed above addressed the potential failure of safety-related electrical equipment after its qualified operating time but before the end of the postulated accident.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 33 Page 8.9-4 Post-accident monitoring equipment has been identified in accordance with paragraph (b)(3). In addition, our response to NUREG-0737, Supplement 1 - Generic Letter 82-33 was transmitted to the NRC on September 15, 1983. This letter identified the qualification requirements and implementation schedule for Regulatory Guide 1.97 equipment. This equipment was qualified and added to the master equipment list in accordance with the schedule provided in the {{letter dated|date=September 15, 1983|text=September 15, 1983 letter}}.
The master equipment list contains the necessary equipment to mitigate the consequences of all Design Basis Accidents (DBAs) identified in the FSAR, including flooding in the auxiliary building.
Equipment qualification is an on-going process that requires implementation into the activities of plant operation. The master equipment list (EQML) will change over the course of plant life due to system design changes, replacement equipment, or additional (b)(1), (b)(2), and (b)(3) equipment identified through procedural changes, licensing changes, etc. The PINGP EQ Program was developed to establish and maintain the regulatory requirements for the environmental qualification of electrical equipment. The program provides for such activities as the identification of electrical equipment within the program, the environmental specifications by plant location, providing auditable documentation supporting the equipments environmental qualification, and ensuring appropriate reviews affecting environmentally qualified equipment are performed as required.
Equipment in the D5/D6 Building, a mild environment, is not subject to the requirements of 10CFR50.49.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.10-1 8.10    POWER OPERATED VALVES 8.10.1    Motor Operated Valves IE Bulletin 85-03 Motor-Operated Valve Common Mode Failures During Plant Transients due to Improper Switch Settings and its supplement (Reference 22 and 23) were issued to ensure that switch settings on certain safety-related motor-operated valves (MOVs) were selected, set and maintained correctly to accommodate the maximum differential pressures expected during both normal and abnormal events within the design basis.
In June of 1989, IEB 85-03 was superseded by Generic Letter 89-10 Safety-Related Motor Operated Valve Testing and Surveillance (Reference 24). Generic Letter 89-10 recommended that a program be established to ensure that all safety-related MOVs are selected, set and maintained appropriately. Several supplements to Generic Letter 89-10 (Reference 25) have been issued to clarify program scope, schedule, and recommendations. In August 1995, the NRC conducted a closeout inspection to verify the completeness of NSPs commitments made in response to Generic Letter 89-10 (Reference 26).
In September 1996, the NRC issued Generic Letter 96-05 Periodic Verification of Design-Basis Capability of Safety related Motor-Operated Valves (Reference 27) which superseded GL 89-10 and its supplements. The generic letter requested that licensees establish a program, or ensure the effectiveness of its current program, to verify on a periodic basis that safety related MOVs continue to be capable of performing their safety functions within the current licensing basis of the facility.
Prairie Island modified its periodic verification program to meet the intent of the generic letter. The NRC reviewed the Prairie Island periodic verification program and concluded that the program adequately addressed the actions requested in GL 96-05 (Reference 28).
8.10.2    Generic Letter 95-07, Pressure Locking and Thermal Binding of Safety Related Power-Operated Valves Generic Letter 95-07 (Reference 29) was issued by the NRC requesting licensees to provide information concerning; (1) the evaluation of operational configurations of safety-related, power-operated gate valves for susceptibility to pressure locking and thermal binding; and (2) analyses, and needed corrective actions, to ensure that safety-related power-operated gate valves that are susceptible to pressure locking or thermal binding are capable of performing the required safety function.
All Motor Operated Valves (MOVs), Air Operated Valves (AOVs), and Hydraulically Operated Valves (HOVs) were reviewed to determine applicability of this issue.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.10-2 For those valves which were identified to be potentially susceptible, an evaluation was performed to ensure each valve can perform its intended safety function. The NRC has determined that Prairie Islands evaluation and resulting corrective actions adequately addressed Generic Letter 95-07 (Reference 30).
A plant modification (Reference 40) drilled a 1/8" diameter hole in the upstream disc of the motor operated valve MV32206, and MV32207 (MV32208, MV32209) allows pressure inside the bonnets to equalize with upstream Residual Heat Removal cross-over line. The equalization in pressure will preclude pressure locking.
A Plant Modification (Reference 45) installed bonnet vents on MOVs MV32077 and 01431472 MV32078. The bonnets of these valves have a vent line installed to eliminate the possibility of pressure in the bonnets. The valves are flex wedge gate valves. The vent will be routed back to the process piping. This equalization in pressure will preclude pressure locking.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.11-1 8.11    REFERENCES
: 1. Letter, T.M. Parker (NSP) to Nuclear Regulatory Commission, Reply to Questions on Design Report for the Station Blackout/Electrical Safeguards Upgrade Project, July 10, 1991. (2850/1690)
: 2. Letter, C E Larson (NSP) to Director of Nuclear Reactor Regulation, Interim Response to NRC Bulletin 88-10, March 31, 1989. (2040/2135)
: 3. Letter, T M Parker (NSP) to Director of Nuclear Reactor Regulation, Response to NRC Bulletin 88-10, Supplement 1, Nonconforming Molded-case Circuit Breakers, November 6, 1989. (2040/2148)
: 4. Letter, D C DiIanni (NRC) to T M Parker (NSP), Response to Bulletin 88-10 and Supplement 1 Nonconforming Molded-case Circuit Breakers Prairie Island Nuclear Generating Plant Unit Nos. 1 and 2, March 7, 1990.
(1857/0809)
: 5. Letter, T M Parker (NSP) to Director of Nuclear Reactor Regulation, Project for Addition of Two Emergency Diesel Generators, September 29, 1989.
: 6. Deleted
: 7. Letter, D C DiIanni (NRC) to T M Parker (NSP), Safety Evaluation Related to the Emergency Diesel Generator Qualification Plan (TAC Nos 68588 and 68589), January 31, 1990. (30814/0111)
: 8. IEB 79-01B, Environmental Qualification of Class IE Equipment, January 14, 1980. (1061/0451)
: 9. Letter, D E Gilberts, (NSP) to J G Keppler (NRC), Prairie Island Nuclear Generating Plant - Final Response to IE Bulletin No. 79-01B, October 31, 1980. (1061/0996)
: 10. Letter, R A Clark to L O Mayer, Environmental Qualification of Safety-Related Equipment (includes SER), May 22, 1981. (18309/1155)
: 11. Letter, L O Mayer (NSP) to Director of Nuclear Reactor Regulation, Response to IE Bulletin No. 79-01B Safety Evaluation Report, August 26, 1981. (18309/1900)
: 12. Letter, L O Mayer (NSP) to Director of Nuclear Reactor Regulation, Response to IE Bulletin 79-01B Safety Evaluation Report, April 30, 1982.
(18311/1871)

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.11-2
: 13. Licensee Event Report, RE-93-14, Cable Separation at Main Control Board, December 16, 1993. (2869/0157)
: 14. Letter, D Musolf (NSP) to Director of Nuclear Reactor Regulation, Pressure and Temperature Profiles Outside Containment, August 27, 1982.
(18312/1023)
: 15. Letter, R A Clark to D M Musolf, Safety Evaluation for Environmental Qualification of Safety-Related Electrical Equipment, April 25, 1983.
(18347/2178)
: 16. Letter, D M Musolf (NSP) to Director of Nuclear Reactor Regulation, Resolution of Safety Evaluation Report for Environmental Qualification of Safety-Related Electrical Equipment, January 16, 1984. (19896/0388)
: 17. WCAP-10961-P, Steamline Break Mass/Energy, Releases for Equipment Environmental Qualification Outside Containments Report to the Westinghouse Owners Group, October, 1985.
: 18. Deleted
: 19. ENG-EE-171, Degraded Voltage Analysis.
: 20. Letter, NSP to NRC, Response to NRC Generic Letter 91-06: Resolution of Generic Letter Issue A-30, Adequacy of Safety Related DC Power Supplies, 10-28-91.
: 21. Calculations 91-02-11, 91-02-12, 91-02-21 and 91-02-22, Battery Sizing and System Voltage Drop and Short Circuit Analyses for Safeguard Batteries 11, 12, 21 and 22 respectively.
: 22. IE Bulletin 85-03, Motor-Operated Valve Common Mode Failures During Plant Transients due to Improper Switch Settings, dated November 15, 1985.
: 23. IE Bulletin 85-03, Supplement 1, Motor-Operated Valve Common Mode Failures During Plant Transients due to Improper Switch Settings, dated April 27, 1988.
: 24. Generic Letter 89-10, Safety-Related Motor Operated Valve Testing and Surveillance dated June 28, 1989.
: 25. Generic Letter 89-10, Safety-Related Motor Operated Valve Testing and Surveillance - Supplements 1 through 7, various dates.
: 26. NRC correspondence dated August 17, 1995, Close-out Inspection of Generic Letter 89-10 (NRC Inspection Report No. 50-282/95010(DRS);
50-306/95010(DRS)

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.11-3
: 27. Generic Letter 96-05 Periodic Verification of Design-Basis Capability of Safety related Motor-Operated Valves dated September 18, 1996.
: 28. NRC correspondence dated December 29, 1999, Prairie Island Nuclear Generating Plant, Units 1 and 2 - Closure of Generic Letter 96-05, Periodic Verification of Design Basis Capability of Safety-Related Motor-Operated Valves (TAC Nos. M97089 and M97090)
: 29. Generic Letter 95-07, Pressure Locking and Thermal Binding of Safety Related Power-Operated Valves dated August 17, 1995.
: 30. NRC correspondence dated August 24, 1999, Prairie Island Nuclear Generating Plant, Units 1 and 2 - Closure of Generic Letter 95-07, Pressure Locking and Thermal Binding of Safety Related Power-Operated Valves Prairie Island Nuclear Generating Plant (TAC Nos. M93507 and M93508)
: 31. Not Used
: 32. Letter, D. C. Dilanni (NRC) to T.M. Parker (NSP), Safety Evaluation of the Prairie Island Nuclear Generating Plant Unit Nos. 1 and 2; Station Blackout Rule 10 CFR 50.63 (TAC Nos. 68588 and 68589), September 18, 1990 (30814/3052)
: 33. Letter, D. Musolf (NSP) to Director of Nuclear Reactor Regulation (NRC),
Loss of All Alternating Current Power Information Required by 10 CFR Part 50, Section 50.63(c)(1), April 13, 1989
: 34. Letter ESU-3456, Fulfill of SBO Rule (10CFR50.63); Verification of Supplying AAC Power to SBO Unit within 10 Minutes, March 11, 1994 (2759/86)
: 35. 10CFR50.59 Screening 1828, Rev. 0 (4128/0559)
: 36. Calculation ENG-EE-045, Diesel Generator Steady State Loading for a LOOP Coincident with an SBO
: 37. Calculation ENG-ME-443, Condensate Storage Tank Sizing
: 38. Engineering Change Evaluation, EC #20717, Rev. 1, Station Position on D5 and D6 Emergency Diesel Generator Operability with Regards to the Number of Starting Air Receivers - Answers Aug. 2012 P.I. & R. (NRC Problem Identification and Resolution Inspection) Question #100
: 39. Engineering Change Evaluation, EC #20927, Rev. 0, D5/D6 EDG, Availability with Regards to the Number of Charged Starting Air Receivers
: 40. PINGP Modification EC19490, (PRI 75) Drill RHR to SI Suction Valve Discs to Eliminate Pressure Locking Affected Valves are MV-32206 and MV-32207 in Unit 1 and MV-32208 and MV-32209 in Unit 2.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 Page 8.11-4
: 41. Calculation ENG-EE-018, Unit 2 Diesel Generator Sequence Loading for an SI Event (LOCA) Concurrent with a LOOP.
: 42. Calculation ENG-EE-021, Diesel Generator Steady State Loading for an SI Event Concurrent with Loss of Offsite Power (LOOP) for D1, D2, D5, D6.
: 43. Calculation ENG-EE-183, Unit 1 Electrical Transient Analysis for a LOCA Concurrent with a LOOP.
01423445
: 44. Calculation 32-9218303, Rev. 1, Prairie Island Nuclear Generating Plant Unit 2 Diesel Engine Air Start Calculation.
01431472
: 45. Modification EC 23491, Vent RHR Sump B Suction Valve Bonnets to Eliminate Pressure Locking.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 33 TABLE 8.4-1, DELETED TABLE 8.4-2, DELETED TABLE 8.4-3, DELETED TABLE 8.4-4, DELETED

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 8 Revision 34 TABLE 8.5-1, DELETED 01407637 TABLE 8.5-2, DELETED

USAR SECTION 8 Revision 34 01395778 FIGURE 8.2-1, has been DELETED

1                                                                  2                                                        3                                                        4                                                      5                                              6                                1r                       7                                             8                                                         9                                                 10                                           11                                                                                      12 REVISIONS KEY JNTERLOCKE SO THAT ONLY ONE DISCONNECT CAN BE CLOSED w            AS BUILT-AT A TIME.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 lNCORPORATE DRAWING INTO A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      A NSP DRAWING SYSTEM NOTE l      8Hl6 & 81-117 *1 GEN. GCB'S TRIP FOR                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       PER NOR Pl-14-111 N*. I GEN. DIFFERENTIAL OWN: JEK 6-6-14 NO, I GEN. GROUt-ll NO. I GEN. NEGATIVE PHASE SEOl&#xa3;NCE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         CHK'O: JML                7-2-14 NO. I GEN. VOLTl'IOEll'REOUENCI' TA]P                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      MOD": EC-2411149 NO. 1 GEN. LOSS OF FIELD                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   APP'     *:    CMR 7-2*\4 NO, I OEN. OYER EXCITATION NO. 1 OEN. TR. SUDDEN PRESSURE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           I 1      I ISSUE FOR
* NO. I GEN. TR.
* lF"FERENTIAL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            1-!---l CONSTRUCTION r-10, I OEN. TR.     *ROI.ND                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               REVISED GEN. NO, l NO. I TURBINE TRIP                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         RATING. 1-672000 TO NO. I TURBINE THRUST BEARING FAILURE l-730000.
NO. IM STA. AUX. TR. SUDDEN PRESSURE
-                      NO, IM SHI, AUX, TR, DIFFERENTIAL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               f--
NO. IM STA, AUX. TR, OVER CURRENT                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          OWN: JRM                9-11-14 NO. IM STA. AUX. TR. GROUIII
* CHK'O: JW                  9-11-14 NO. I REACTOR TRIP NO, I OEN. UNOERF"REOI..ENCY                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               MOD": EC-21254/ECN 24401 SUBSTATION TRIPS r21PI\GT, 215I\GTJ                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        REVIEWED: KJN 9-11-14 PE CERT:
KEN NETZEL NOTE 2      SH13 8, SHH "2 GEN. GCB'S TRIP FOR 9-11-14                 PE" 49677 NO, 2 GEN, DIFFERENTIAL NO, 2 GEN, GROUND                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          APP'     *:    MLM         9-07-14 NO. 2 GEN. IIEGATIVE PHASE SEQUENCE AS BUILT-NO. 2 GEN. VOL Tl'IGE/FREOUEJICY TRIP N*. 2 GEN. LOSS CF FIELD                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   lNCORPORATED A/E's B                       *.
N 2 GEN. OVER EXCITATION N 2 GEN. TR. SUDDEN PRESSURE REV, 1 PER
* RR PI-15-078 B
N 2 GEN. TR. *IFF"ERENTIAL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 CERTIF"IED REV. I, N 2 GEN. TR. GRDUNO                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        TRANSF"ERRE
* TO NO. 2 TURBINE TRIP NO. 2 TURBINE THRUST BEARING FAILURE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       RECORD TRACING.
NO. 2 M STA. AUX. TR. SUOOEN PRESSURE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      OWN: MEA               7-2-15 NO. 2 M STA. AUX. TR. *IF"F"ERENTIAL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       CHK'O: KJN 1-29-16 NO, 2 M STA, AUX, TR, OVER CURRENT NO, 2 M STA, AUX, TR, GROUNO                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               MOD"1 EC-21254 NO. 2 REACTOR TRIP                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         APP'     *:    KJW         2-1-16 NO. 2 GEN. LKIERF"RElll&#xa3;NCY TO                                                                                                                                                                          I/ I         ISSUED FOR SUBSTATION TRIPS [21P/2GT, 21S/2GT1                                                                                                                                                                                                                                                                              TO                               TO                                                                  TO                                                                                                                                                                                                                 i-=---l      CONSTRUCTION N TE J      H = HORIZONTAL REMCNABI..E LIIIKS NORTH ROCHESTER                           RED ROCK                                                              HAMPTON                              RED ROCK REVISED GEN NO. 2 V : VERTICl!IL REMOVABLE LIM<S 8585 &                            8P27 &                                                                8549 &                            8P25 GCB &
8S98       BKRS                    BP28 GCBS                                                             8S50 BKRS                             8P24     GCB                                                                                                                                                                       RATING 34!!KY MJ* 'S. ARE RC FROM PLANT
                                                                                                                                                                                                                                                                                                                                                                       ~I                                                                                                         ~1
                                                                                                                                                                                                                                                                                                                                                                                                                                             ,~1 lNCDRP MARKUP FROM I                                                                                                    I NOTE 4 C* NTR* L R* OH ONLY                                                                                                                                                                                                                                                                                                          i                                                                                                 i                                                                                                                                                                                                          EC-20494
                                                                                                                                                                                                                                                                                                                                       ,/i i:.Tt 8Hl31!1, 8Hl38,8Hl4BI, 8HH82 OWN: JRM                11-17-14 BHIGA, BH168, BH1761. BH17B2
: ---<~                                                                                                    : H~                                                                                                                                                                            CHK'O: IW NOTE 5      TRZRS MUST BE CE-ENERGIZE* AN
* THE SWITCl-&#xa3;S TRANSFERRED CEA*.
TO SPRING CREEK
                                                                                                                                                                                                                                                                                                                                                                       ~ A- ~                                                                                                     ~~     A-   ~                                                                                                                                                                   MOD"= EC-21255 REVIEWED: KJN 4H8 & 4H9 &                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           PE CERT:
6Hto
* CBS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       KEN J,NETZEL C                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      C PE* 49677
                                                                                                                                                                -~1 APP'     *:    MLM        12-3111-14 AS BUILT-lNCORPORATEO A/E's REV, 2              PER AREAS lfllllCATEO ARE FDR                                                                             ORR PI-16-11141 AUTH RIZINO SWITCHING AN CLEARANCE Fa=! WORK
* PRCNIOINO                                                              CERTIFIED REV. 2 B2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          TRANSFERRED TO RECORD TRACING.
DEEP       WELL    PUMPS XFER SWITCHES                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 OWN: MEA               2-24-16 CNF-40240-3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 CHK'01 KJN 2-25-16
-                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 MOD": EC-21255 I                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       APP'D: KJW                 3-2-16 I< I         ISSUED FOR 1-!:'.--l    CONSTRUCTION REVISED 2M TRANSF.
RATING CHANGE FROM 10001<vA       u.Lu  y    4Blill277            TRAINING l-44800 TD 1-45000
* CENTER
                                                            &#xb5; O,yg OWN: WTT               11*11-16 CHK'O: CJS 11-11-16 B U R N S I D E L500                                                          ,-soo MOD": EC-26821 D           32 LINE                                        ll. d,                         d,.O.
REVIEWED: WJB PE CERT:
11-11-16            D 12.5 *
* 13.B
                                                           ,12D/.208                   *
                                                                               ,1201.2 8 PE" APP'     *:    KFK        11-ll-16                                           'I""
AS BUILT-lNCORPORATED A/E',.                                                          ('I)
REV. 3              PER
('I)
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0 TRANSF"ERRE                  TO i--------                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   RECORD TRACING.
OWN: MEA CHK'O: JB 3-12-18 3-19-18                                            0 0
1 MOD 11 :6M0 00026821*
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* I 22-1                            22-4         21-1                         21-4                                                                                    12-1                            I   ~2-4      11-1                        11-4 5CC JURIS*ICTION                                                                                                                                                     3 AREAS INDICATED ARE FDR AUTHORIZING SWITCHING AN* PR
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                                                                                                                                                                                                                                                                                                                                                                                                                     *31-2 3                                 3                                                                                                                                                                                                                                                                        3 4.16 ,24 E-                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   CY' 3
PLANT                '32-2                                                                                                                                                                                                                                                                                                     (Y]
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                                                                                                                                                                                                                                                                                                                                                                                                                                \      THE PLANT SUBSTATIDN COORDINATOR MUST                          \
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                                                                                                                                                                                                                                                                                                                                                                                                                                  \    BE CONTACTED PRIDR TO MAKING ANY CHANGES \
                                                                                                                                                                                                                                                                                                                                                                                                                                    \ TO THIS OPERATING ONELINE DIAGRAM.
                                                                                                                                                                                                                                                                                                                                                                                                                                     \
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        \
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          \
CHECIED Slt!NIFICNITNO.                  863111 I             I           ~ I I       1         I       2      I     s       I     4     I     o      ICLI          8 PRCIJECTND AREA NOT OTHERWISE IN* ICATEO IS sec JURISDICTICf\l Fa=! tlUTH* RIZINO SWITCHING                                                           APP'D&CERT.                                            PRAIRIE ISLAND PLANT AND ANO PROVl
* IMG CLEARANCE FOR WrRK.
H                                                                                                                                                                                                                                                                                                                                                                                                                                           INTERJURISOICllONAL SWITCHING
* IRECTION PROVIDED BY sec.
SUBSTATION OPERATING                                                                                     H Fl.MED                                                             ONE LINE DI AGRAM NORlHERN STATES POWER COMPANY
(} x-lEne,gy-9CALE      NONE                    I= 3 PRAIRIE ISIAND NUCLEAR GENERATING PIANT REDWINll, MINNESOTA                                             NF-239270
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                $$USERNAME$$                                                              NF-239270.DG"-J j NSP (ifNFRATIQN CAD j j
* 10                                                                                                                                   12
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1                                                                  2                                                        3                                                        4                                                      5                                              6                                                         7                                             8                                                         9                                                                          $$$$$$$$$DES IONF" IL$$$$$$$$$
FIGURE 8.2-2                                                                                    REV. 35 CAD FILE: U08202oOGN

                                                                                                                                                            ~1 REVISIONS
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REVISIONS r                                 1 I                                    I I Portable Battery Charger I                                                11 Battery MCC 1AC1                                                                                         I[                                  )I 11 Inverter 11 lntemlptible Aux Tranafonner              -------------------IHc::::r*J,.-.,,,,.,..___~
0                                                                                             4'MN-120/20IN
                                                                                                                                                                                                   -    I
                                                                                                                                                                                                                                 ~
r             ____!_
DC Panel 11 (Orange) 24 ctrcufta -'
                                                         ~ency (Nori App"\,                                                                         ~                  ~                                     ~                          :--n=n
:--a::n-                                                         :--n=n f5l
                                                                                                                                             ~                                                        ~
13 lmtrter From_jDCr-pa-ne1_1_2_-+-----                                                        a::::o---          ~                                     [Cl}~                      :--n=n
                                             ~                                                            toPnl 112All
                                                                                                                                             ~                  ~                                     ~                          :--.en
                                                                                         -.i:r::::::J[)--l--
                                                  -----+---,(]c::::71i--------'--- __ """-..           .r_o Pnl 114 Alt.                    T u r b l ~ Auxlllariff DC                                    Nuclear .Auxlllarlff DC Panel 13, 38 ctrculta r To Pnl. - - L - ' ~                   ~ ,_                                                                                                             Panel 11, 24 Clrculta 2EMA ,- --1---rr" Manual Bypaaa SWltch From DC Pnl. 21                                                 From DC Pnl. 21
                      -------1~
l   Panel 117 208/120 VAC I                                                                           I (Interruptible) 24 Clrculta Main}-- - --
* Altemate    Main}-- - - - .) Alternate I    .            .;
Attema~ - - - -
* Maln I            I                                                                                           I            I
      - r-..--r-..-                              --r-..-                                                      -
                                                                                                                     -~r-..-
r-..
                                         -                                                                        ~
DCPanel 19, 12Clrculta                                                   DC Panel 17, 12 Circuits
      - r-.. r-..-
            -'-                          -  r-..
                                                 -   r-..
r-..   ~
      - r-.. r-..-                                                                                                                                                   &deg;""    TAM     '&deg;"Tt6-23-qq                SICNIFIC#IT Nil, t:=:~--;::;:::;::--;---~-~--....L-,!_....l.___!
CIECl<ED                                         -
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Panel 113 lnetNment Bus Ill (Blue) 24 Clrculbl                          l'IIOJ(CT Nil, ETNSUR
                                                                                                                                                                     -
* COIT.                                     125 VDC & 120 VAC INSTRUMENT SUPPLY Panel 1EMA (Orange) 18 Circuits Panel 111 lnatrurnent Bus II (White) 24 Circwa UNIT 1 TRAIN *A*
NORTHERN STATES POWER COMPANY                                 SOOLE  NONE PRAIRIE I SLAND NUCLEAR GENERATING PLANT                                t--..,;,;,.;__,_ _.,,_ _ _ _ __.
RED W!NC MINNESOTA                                   FIGURE 8.5-1A            REV. 21

REVISIONS MCC1AC2 I  Portable Battery Charger l ________ l I                      Q        12Battery DC Connection I.
_JI ~=-Ie~ I AC Connection Cy>                               &-,-..-                    ~      12 Battery Shunt
                                                                                                                                                                                  ~-------ir-
                                      ,2_
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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page i SECTION 9 PLANT RADIOACTIVE WASTE CONTROL SYSTEMS TABLE OF CONTENTS Page 9.1   

==SUMMARY==
DESCRIPTION ....................................................................9.1-1 9.1.1   General Systems Description ...................................................9.1-1 9.1.2   Component Design Considerations ..........................................9.1-3 9.2   LIQUID RADWASTE SYSTEM ...............................................................9.2-1 9.2.1   Design Basis ............................................................................9.2-1 9.2.2   Description ...............................................................................9.2-2 9.2.3   Performance Analysis ..............................................................9.2-9 9.3   GASEOUS RADWASTE SYSTEM .........................................................9.3-1 9.3.1   Design Basis ............................................................................9.3-1 9.3.2   Description ...............................................................................9.3-2 9.3.3   Performance Analysis ..............................................................9.3-5 9.4   SOLID RADWASTE SYSTEM ................................................................9.4-1 9.4.1   Design Basis ............................................................................9.4-1 9.4.2   Description ...............................................................................9.4-1 9.4.3   Performance Analysis ..............................................................9.4-1

==9.5   REFERENCES==
........................................................................................9.5-1

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page ii TABLE OF CONTENTS [Continued]
LIST OF TABLES TABLE 9.1-1 WASTE DISPOSAL SYSTEM PERFORMANCE DATA TABLE 9.1-2 WASTE DISPOSAL COMPONENTS CODE REQUIREMENTS TABLE 9.1-3 COMPONENT 

==SUMMARY==
DATA TABLE 9.2-1 PERFORMANCE DATA AND SERVICE REQUIREMENTS TABLE 9.2-2 PERFORMANCE DATA AND SERVICE REQUIREMENTS TABLE 9.2-3 LIQUID SOURCE TERMS FROM THE PRAIRIE ISLAND PLANT (PER UNIT)
TABLE 9.2-4 PRAIRIE ISLAND LIQUID RADWASTE SYSTEM TABLE 9.3-1 GASEOUS SOURCE TERMS FROM THE PRAIRIE ISLAND PLANT (PER UNIT)
TABLE 9.3-2 PRAIRIE ISLAND - HIGH LEVEL LOOP PROCESS CONDITIONS AND MAXIMUM ISOTOPIC CONCENTRATIONS TABLE 9.3-3 PRAIRIE ISLAND - LOW LEVEL LOOP PROCESS CONDITIONS AND MAXIMUM ISOTOPIC CONCENTRATIONS

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page iii TABLE OF CONTENTS [Continued]
LIST OF DRAWINGS FIGURE 9.1-1  FLOW DIAGRAM - WASTE DISPOSAL SYSTEM FIGURE 9.1-2  FLOW DIAGRAM - AUXILIARY & REACTOR BUILDING FLOOR
                 & EQUIPMENT DRAIN SYSTEMS FIGURE 9.1-3  FLOW DIAGRAM - STEAM GENERATOR BLOWDOWN SYSTEM FIGURE 9.1-4  FLOW DIAGRAM - STEAM GENERATOR BLOWDOWN SYSTEM FIGURE 9.1-5  FLOW DIAGRAM - STEAM GENERATOR BLOWDOWN SYSTEM FIGURE 9.1-6  FLOW DIAGRAM - WASTE DISPOSAL SYSTEM FIGURE 9.1-7  FLOW DIAGRAM - WASTE DISPOSAL SYSTEM FIGURE 9.1-8  FLOW DIAGRAM - WASTE DISPOSAL SYSTEM FIGURE 9.1-9  FLOW DIAGRAM - MISCELLANEOUS GAS SYSTEM FIGURE 9.1-10 FLOW DIAGRAM - RADWASTE BUILDING LIQUID WASTE DISPOSAL AND WASTE SOLIDIFICATION SYSTEMS

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page iv THIS PAGE IS LEFT INTENTIONALLY BLANK

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 Page 9.1-1 SECTION 9 PLANT RADIOACTIVE WASTE CONTROL SYSTEMS 9.1     

==SUMMARY==
DESCRIPTION 9.1.1    General Systems Description Radioactive fluids entering the Waste Disposal System are collected in intermediate holding tanks for determination of subsequent treatment. They may be sampled and analyzed to determine the quantity of radioactivity, with an isotopic analysis if necessary. The liquid wastes are then processed as required for reuse or released under controlled conditions and in accordance with applicable limits of 10CFR20 and the design objectives of Appendix I to 10CFR50.
The bulk of the radioactive liquid drained from the Reactor Coolant System is processed by the Chemical and Volume Control System recycle train and retained inside the plant.
This minimizes liquid input to the Waste Disposal System which processes relatively small quantities of generally low activity level wastes. The processed water from the 01-082 waste disposal system, from which the majority of the radioactive material has been removed may be reused in plant or released through a monitored line to the canal downstream of the cooling towers.
Waste gases are processed by one of two interconnected equipment trains. The low level loop, provides sufficient storage capacity for cover gases from the nitrogen blanketing system to minimize the need to vent gases which accumulate as a result of load follow operations. Discharges of fission gases from the system are limited to maintenance vents, unavoidable equipment leaks, and infrequent gas decay tank                01-081 releases to dispose of gases accumulated by inflows from shutdown operations and miscellaneous vents. Controls are provided to regulate the rate of release from these tanks through the monitored plant vent.
The high level loop was designed to accumulate, concentrate and contain fission gases at high activity concentrations from continuous purging of the volume control tanks gas 01-081 space. It would provide continuous removal of fission gases from the letdown coolant to maintain the coolant fission gas concentrations at a low residual level. This loop can perform these functions and/or be used for reserve holdup capacity of low level loop gas.
The spent resins from demineralizers, filter cartridges and concentrates from the evaporators are packaged and stored onsite until shipment offsite for processing and         01-082 disposal.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 Page 9.1-2 The Waste Disposal System Process Flow Diagrams are shown in Figures 9.1-1 through 9.1-10 and Performance Data are given in Table 9.1-1. With the exception of the SGB system, containment building sumps and pumps, reactor coolant drain tanks                 01-082 and drain tank pumps, and associated piping and valves, the Waste Disposal System is common to Units 1 and 2.
The Waste Disposal System collects and processes all potentially radioactive reactor plant wastes for removal from the plant site well within limitations established by regulations.
Fluid wastes are collected, sampled and analyzed to determine the quantity of radioactivity, with an isotopic analysis if necessary. Depending on the results of the analysis, these wastes are processed as required and reused in the plant or released to           01-082 the environment.
If the wastes are to be released from the plant site, they are released under controlled conditions. Radiation monitors are provided to maintain surveillance over the release operation, and a permanent record of activity released is provided by radiochemical               01-082 analysis of the known quantities of waste and substantiated by plant recording instruments. The system is capable of processing all wastes generated during continuous operation of the primary system, assuming that fission products escape to the reactor coolant by diffusion through defects in the cladding of no more than one percent of the fuel rods.
At least two valves must be manually opened to permit discharge of liquid or gaseous waste from the Waste Disposal System. One of these valves is normally locked closed.
An additional control valve will trip closed on a high effluent radioactivity level signal to prevent discharge to the environment.
As secondary functions, system components supply hydrogen and nitrogen to primary system components as required during normal operation, and provide facilities to transfer fluids from the containment to other systems outside the containment.
The system is controlled from local control panels in the auxiliary building and the radwaste building. Malfunctions of the system are locally alarmed in the auxiliary and radwaste buildings, as well as being annunciated in the control room. All system                  01-082 equipment is located in the radwaste building, the auxiliary building, or the reactor containment buildings.
The design basis for the radwaste building is described in Section 12.2.1.4.3.2, Structural Design Basis for Class I* Structures.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 Page 9.1-3 The radwaste building is supplied with outside air which can be preheated by heating coils in the air-handling unit. Exhaust flow is directed through charcoal adsorber beds and a HEPA filter prior to release to the surroundings. The cement dust filter fan exhaust is not directed through the adsorber bed or the HEPA filter. All releases are monitored by the Radwaste Building Radiation Monitor Channel R-35 as described in                01-082 Table 7.5-1. In addition, unit heaters are provided throughout the radwaste building for heating in the winter.
Adjacent to the Radwaste Building is the resin disposal building which receives, dewaters and handles spent resins from the condensate polishing system (See Section 11.8.)
9.1.2    Component Design Considerations Codes applying to components of the Waste Disposal System are shown in Table 9.1-2.
Component summary data are shown in Table 9.1-3.
The wetted surfaces of all pumps are stainless steel or other materials of equivalent corrosion resistance.
Piping carrying liquid wastes is stainless steel or fiberglass while gas piping is carbon or stainless steel. Steel piping connections are welded except where flanged connections are necessary to facilitate equipment maintenance.                                                  01-081 Valves exposed to gases are carbon or stainless steel. Those exposed to liquids are stainless steel. Globe valves are installed with flow over the seats when such an                01-081 arrangement reduces the possibility of leakage.
Isolation valves are provided to isolate equipment for maintenance, to direct the flow of        01-081 waste through the system, and to isolate storage tanks for radioactive decay.
Relief valves are provided for tanks containing radioactive wastes if the tanks might be overpressurized by improper operation or component malfunction. Tanks containing wastes which are normally free of gaseous activity are vented locally.
Outleakage from the system is minimized by using diaphragm valves, bellows seals, self contained pressure regulators and soft-seated packless valves throughout the radioactive portions of the system.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 Page 9.1-4 THIS PAGE IS LEFT INTENTIONALLY BLANK

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-1 9.2     LIQUID RADWASTE SYSTEM 9.2.1     Design Basis Criterion: The facility design shall include those means necessary to maintain control over the plant radioactive effluents, whether gaseous, liquid, or solid.
Appropriate holdup capability shall be provided for retention of gaseous, liquid, or solid effluents, particularly where unfavorable environmental conditions can be expected to require operational limitations upon the release of radioactive effluents to the environment. In all cases, the design for radioactivity control must be justified (a) on the basis of 10CFR20 requirements, for both normal operations and for any transient situation that might reasonably be anticipated to occur and (b) on the basis of 10CFR100 dosage level guidelines for potential reactor accidents of exceedingly low probability of occurrence. (GDC70)
Liquid, gaseous, and solid waste disposal facilities are designed so that discharge of effluents and off-site shipments are a small percentage of the applicable governmental regulations.
The liquid radwaste systems design objective is to have the capability of processing the discharge of radioactive material under normal operating conditions so as to approach essentially zero (i.e., actual river background) and to ensure that activity released under design basis conditions will be a small fraction of the applicable limits in 10CFR20.
9.2.1.1     Liquid Radwaste The liquid radwaste system is designed to collect, process and dispose of all radioactive liquid wastes generated in the operation of the plant. The system is designed to accommodate the radioactive input resulting from the design basis maximum fuel leakage condition.
The radioactive waste system has been shown to meet the requirements of Appendix I to 10CFR50. The radwaste systems reduce the activity released to acceptable levels.
9.2.1.2     Monitoring Radioactive Releases Criterion: Means shall be provided for monitoring the containment atmosphere and the facility effluent discharge paths for radioactivity released from normal operations, from anticipated transients, and from accident conditions. An environmental program shall be maintained to confirm that radioactivity releases to the environs of the plant have not been excessive. (GDC 17).

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-2 The containment atmosphere, the shield building vent, the auxiliary building vent, the control room ventilation system, the spent fuel pool exhaust, the RHR cubicle ventilation exhaust, the condenser air ejector exhaust, the circulating water discharge, the containment fan coolers cooling water discharge, blowdown from the steam generators, the component cooling water, and the Waste Disposal System liquid effluent are monitored for radioactivity concentration during normal operations, anticipated transients, and accident conditions. High radiation in any of these is indicated and alarmed in the control room.
All gaseous effluent from possible sources of accidental radioactive release external to the reactor containment (e.g., the spent fuel pool and waste handling equipment) will be exhausted from an auxiliary building vent, which is monitored. Leaks from piping carrying radioactive liquids are contained within the reactor containment buildings, radwaste building, or auxiliary building. Any contaminated liquid effluent released to the condenser circulating water is monitored. For any leakage from the reactor containment under accident conditions, the plant radiation monitoring system supplemented by portable survey equipment provides adequate monitoring of radioactivity release.
9.2.2     Description The waste disposal system collects, processes, stores and disposes of radioactive liquid waste originating in the plant. The subsystems comprising the Liquid Radioactive Waste Disposal System are: Reactor Coolant Drain (RCD), Auxiliary and Reactor Building Drain (ARD), Steam Generator Blowdown Treatment (SGBT), Non-Aerated Drain, and Aerated Drains Treatment (ADT). The system has the capability of storing 60,000 gallons.
The major sources of liquid waste are:
Reactor Coolant System drains and leaks Chemical and Volume Control System drains and leaks Non-aerated equipment drains and leaks Aerated equipment drains and leaks Chemical laboratory drains Decontamination area drains Radiochemical laboratory drains Sampling System Steam Generator Blowdown Auxiliary Coolant System drains To facilitate storage, processing and disposal, the system is designed to segregate various waste streams at their point of collection into the following categories:
Non-aerated waste Aerated waste Chemical drains Steam Generator Blowdown Resin waste

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-3 Non-aerated waste is primarily from Reactor Coolant System drainage which is collected from the following sources and transferred directly to the Chemical and Volume Control System (CVCS) holdup tanks, or the waste holdup tank (depending on fluid composition) for processing:
: a. Reactor coolant loops
: b. Pressurizer relief tank
: c. Reactor coolant pump secondary seals
: d. Excess letdown (during startup)
: e. Accumulators
: f. Reactor vessel flange leakoffs Fluid directed to the reactor coolant drain tanks is pumped to the CVCS holdup tanks, the waste holdup tank, or the refueling water storage tanks by the reactor coolant drain tank pumps. There is one reactor coolant drain tank with two reactor coolant drain tank pumps located inside of each reactor containment building.
The remaining non-aerated liquid waste originates in the Chemical and Volume Control System charging and letdown paths and the gas decay tank drains. These liquid waste streams are collected and handled in an anaerobic manner to minimize the hydrogen explosion hazard and prevent the escape of gaseous radioactivity. This is accomplished by collecting non-aerated waste in a closed piping system that drains to a non-aerated sump tank. The non-aerated sump tank is isolated from the atmosphere by a flexible diaphram type seal. Normally non-aerated waste is transferred to the CVCS holdup tanks for processing. (see Section 10.2.3)
If the water is not suitable or it is not desirable to send the non-aerated waste to the CVCS holdup tanks, the water can be pumped to the waste holdup tank.
Aerated waste originates primarily from the floor drains, aerated equipment drains and leaks, the laundry equipment drains, and the decontamination area drains.
Where possible, aerated waste is collected by gravity drainage to the aerated sump tank. In other cases, aerated waste is drained to local sumps from where it is pumped to the aerated sump tank. From the aerated sump tank, aerated waste can be pumped to the two aerated monitor tanks, the ADT collection tanks or the waste holdup tank.
Normally the discharge from the aerated sump tank pump is aligned to the waste holdup tank due to its capacity and shielded location. When enough water has been collected in the waste holdup tank for processing purposes, the waste holdup tank is gravity drained to the aerated sump tank, which is pumped to the ADT collection tanks.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-4 Waste water in the ADT Collection tanks is normally processed through the ADT Cartridge Filters. The filtrate is collected in the ADT Condensate Receiver Tanks, and then processed through the ADT Ion Exchangers and collected in the ADT Monitor Tanks. The ADT Monitor Tanks are analyzed, and based on the analysis, may be released or reprocessed.
Waste from the hot sampling station and hot chemical laboratory is collected in the chemical drain tank. Periodically this waste is neutralized, if needed, then pumped to the aerated sump tank.
Waste water from the resin disposal building sump is pumped to the miscellaneous drains collection tank or the waste holdup tank. Waste water from the truck loading enclosure sump is pumped to the aerated sump tank.
Control of radioactivity of the laundry and hot shower wastes is gained by using disposable clothing in areas of known high contamination. The laundry and hot shower waste liquid is directed to the aerated sump tank through the floor drain system. The laundry and hot shower liquid waste is then processed through the ADT system.
Steam Generator Blowdown is discharged to a flash tank shared by both steam generators of a unit. The blowdown line from each steam generator is equipped with two motor-operated containment isolation valves, one inside and one outside of containment. As shown in Tables 5.2-1 Part A (U1) and Part B (U2) only the outside valve is credited for Containment Isolation. The other redundant barrier is the Steam Generator (see Appendix G). Flow into the flash tank from each steam generator is controlled by a single control valve. Flow rate from each steam generator is manually controlled from the control room.
The steam generator blowdown motor operated isolation valves are designed to close upon receipt of a containment isolation signal.
The SGB flow control valves are designed to trip closed if one of the following conditions occur:
: 1. Either Auxiliary Feedwater Pump for the associated unit starts.
: 2. High activity is detected in the associated steam generator blowdown radiation monitor (R19).

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-5 Normally steam generator blowdown from the flash tank is directed to the SGB Holdup Tanks from which it is pumped through a filter and ion exchanger to the respective condenser. This is called reclaim. Occasionally, to control steam generator chemistry, blowdown is released to the circulating water canal via a radiation monitor.
Such is the case during unit startup. In the event that radioactivity exceeds the setpoint of the SGB Radiation Monitor, the discharge valve to the river automatically closes thus securing the release. The steam from the blowdown flash tank is normally routed to the extraction steam inlet to Feedwater Heater No. 3. Steam can also be routed to the main condenser or to the atmosphere. The noncondensible gases removed from the condenser (by an air ejector) pass through a radiation monitor at all times, however the radiation monitor for the air ejector discharge is not considered an effluent monitor. The air ejector discharge monitor alarm set point is based on monitoring primary to secondary leakage and not based on monitoring effluent release.
The air ejector discharge is directed to Auxiliary Building Ventilation. Auxiliary Building Ventilation is equipped with monitoring for effluents. Auxiliary Building Ventilation Monitoring provides alarm and trip functions.
SGB Monitor Tank liquid releases are made based on radiochemical batch analysis of the tank contents and are monitored by the waste disposal system liquid effluent monitor.
Information on concentrations in these effluents that are below the functional alarm levels are provided by the routine radiochemistry analysis and continuous ERCS monitor.
9.2.2.1     Components 9.2.2.1.1     Laundry and Hot Shower Tanks The laundry and hot shower tanks are constructed of welded stainless steel. The inlets to these tanks have been closed off. Laundry and hot shower waste is now directed to the floor drain system.
9.2.2.1.2     Chemical Drain Tank The chemical drain tank is stainless steel and collects drainage from the chemistry laboratory. After analysis, the tank contents are treated as aerated waste.
9.2.2.1.3     Reactor Coolant Drain Tanks The reactor coolant drain tanks are right circular cylinders with spherically dished heads. The tanks, which are all welded stainless steel, serve as a drain collecting point for the Reactor Coolant System drains and other equipment located inside the reactor containments. The tank contents can be discharged to the CVCS, waste holdup tank, or to the refueling water storage tanks.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-6 9.2.2.1.4     Waste Holdup Tank The waste holdup tank receives radioactive liquids from various aerated plant systems and drains. Various non-aerated equipment can also be aligned to the waste holdup tank. The tank is constructed of welded stainless steel and can be drained to the aerated sump tank or pumped to either the waste evaporator or the waste condensate tanks.
9.2.2.1.5     Aerated Sump Tank and Pumps The aerated sump tank serves as a collecting point for auxiliary building floor drains and various aerated equipment system drains. A horizontal centrifugal sump pump or shared backup pump are used to transfer the tank contents to the waste holdup tank, ADT collection tanks, or the aerated monitor tanks. All wetted parts of the pumps are stainless steel. The aerated sump tank is constructed of welded stainless steel.
9.2.2.1.6     Non-Aerated Sump Tank The non-aerated sump tank serves as a collecting point for waste water from the charging pump seal water, gas decay tank drains, demineralizer drains, and other various non-aerated equipment drains. A horizontal centrifugal pump or shared backup pump transfers this collected liquid normally to the CVCS holdup tank, but can be aligned to transfer the contents to the waste holdup tank. The tank is constructed of welded stainless steel with a diaphragm seal to prevent entrained gases from escaping to the atmosphere. This tank can be vented to the waste gas compressor suction.
9.2.2.1.7     Aerated Drains Treatment (ADT) Monitor Tanks The ADT monitor tanks are constructed of welded stainless steel and can receive water from the ADT ion exchangers and the SGB monitor tanks. The tanks serve as a final collection point for water which has been processed through the liquid radwaste treatment system. Depending upon chemical analysis, the water in the ADT monitor tanks can be released to the environment, reprocessed, or returned to the waste holdup tank or SGB monitor tanks, for decay.
9.2.2.1.8     Aerated Drains Treatment (ADT) Collection Tanks The aerated drains treatment collection tanks can receive liquid from the aerated sump tank, the miscellaneous drains collection tank, the ADT monitor tanks, or the SGB system for processing in the radwaste building. The ADT collection tank water is normally processed through the ADT cartridge filters, but can be directed to the waste holdup tank for additional decay. The ADT collection tanks are constructed of welded stainless steel.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-7 9.2.2.1.9      Aerated Drains Treatment (ADT) Ion-Exchangers The ADT system uses three flushable ion-exchangers that can be operated in parallel or series and are shared by Units 1 and 2. Each ion exchanger contains approximately 35 cu. ft. of resin. Each vessel is constructed of stainless steel, with a stainless steel retention screen.
9.2.2.1.10     Miscellaneous Drains Collection Tank The miscellaneous drains collection tank receives liquids from floor drains of the radwaste building and from the resin disposal building sump. It can be used as excess storage in series with the ADT collection tanks. The miscellaneous drains collection tank is constructed of welded stainless steel.
9.2.2.1.11     SGB Monitor Tanks The SGB monitor tanks are constructed of welded stainless steel and can serve as a collecting point for the SGB ion exchanger outlet. The tanks are occasionally used for ADT water waiting reprocessing.
9.2.2.1.12     SGB Ion Exchanger Two flushable ion exchangers, operated in parallel, are shared by Units 1 and 2. Each ion exchanger contains approximately 37 cu. ft. of resin. Each vessel is constructed of stainless steel, with a stainless steel resin retention screen.
9.2.2.1.13     Waste Evaporators Equipment not used.
9.2.2.1.13.1     2 GPM Radwaste Evaporator Equipment not used.
9.2.2.1.13.2     Waste Feed Equipment not used.
9.2.2.1.13.3     Steam Supply Equipment not used.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-8 9.2.2.1.13.4  Cooling Water Supply Equipment not used.
9.2.2.1.13.5  Distillate System Equipment not used.
9.2.2.1.13.6  Concentration Level Equipment not used.
9.2.2.1.13.7  Nitrogen Blanketing Equipment not used.
9.2.2.1.14    ADT Evaporator (5 GPM)
Equipment not used.
9.2.2.1.14.1  Evaporator Equipment not used.
9.2.2.1.14.2  Vapor Condenser Equipment not used.
9.2.2.1.14.3  Concentrate Cooler Equipment not used.
9.2.2.1.14.4  Recirculation Pump Equipment not used.
9.2.2.1.14.5  Distillate Cooler Equipment not used.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-9 9.2.2.1.14.6     Vent Cooler Equipment not used.
9.2.2.1.15    Waste Condensate Tanks The waste condensate tanks are constructed of welded stainless steel and are used for excess holdup capacity for liquids awaiting processing.
9.2.2.1.16    ADT Condensate Receiver Tanks The ADT condensate receiver tanks are constructed of welded stainless steel and serve as an intermediate holding point for radwaste water processing.
9.2.2.1.17    Aerated Monitor Tanks The aerated monitor tanks are constructed of welded stainless steel and are available for holdup of excess waste liquid awaiting processing via the liquid radwaste system.
9.2.2.1.18    Waste Liquid Discharge Header The waste liquid discharge header begins below grade just outside of the auxiliary building and travels to the circulating water distribution basin discharge structure at the head of the circulating water discharge canal. The header then enters the discharge canal and travels along the canals bottom terminating in a mixing diffuser just upstream of the circulating water canal discharge structure at the Mississippi River.
The buried portion of the header is a polypropylene dual wall containment system with leak detection. Adjacent to the circulating water distribution basin discharge structure the header terminates into a sump system which allows sampling for leakage. The portion of the header within the discharge canal is single wall polypropylene pipe.
(References 2,3) 9.2.3     Performance Analysis Liquid wastes are generated primarily by plant maintenance and unit operation. Under normal conditions, these wastes are treated as necessary to meet release requirements and discharged to the environment.
The Liquid Radwaste System was analyzed and evaluated to show plant capability to meet the design objectives of Appendix I to 10CFR50. See Reference 1 for details.
The liquid source terms were calculated using the GALE code and are presented in Table 9.2-3. The following assumptions were used in the analysis.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-10
: a. Part of the reactor coolant letdown stream (called shim bleed) is diverted to the Chemical Volume Control System (CVCS) hold up tank. After further processing, it was assumed that the entire shim bleed is released to the circulating water discharge canal.
: b. Equipment and clean wastes, which are collected in the reactor coolant drain tank and the nonaerated drain sump tank, respectively, are processed together with the shim bleed. In the analysis, it was assumed that all the wastes treated were released to the discharge canal downstream of the cooling towers.
: c. Dirty wastes originating from the aerated drain system are usually collected in the aerated drain treatment (ADT) collection tank. Following processing, the wastes were assumed processed through two ADT ion exchangers in series and the entire content was discharged to the circulating water discharge canal.
: d. Steam generator blowdown is normally processed through the steam generator blowdown (SGB) ion exchanger and then discharged to the condenser. Blowdown is released to the circulating water discharge canal approximately 5 days a month with no processing. For the analysis, it was assumed that the blowdown was continuously processed through the SGB ion exchanger (mixed bed) and pumped to the SGB monitor tank where the entire contents are released to the discharge canal.
: e. Detergent wastes which originate from the laundry and hot shower drains are collected in the laundry and hot shower tanks. For the analysis, it was assumed that the wastes were discharged through the laundry tank strainer to the discharge canal without treatment. In addition, the amount of detergent wastes was assumed to be 450 gal/day as indicated in NUREG-0017. Table 9.2-4 contains information pertinent to the above liquid radwastes.
The results of the analysis demonstrated the plants capability of keeping the levels of radioactivity in effluents as low as reasonably achievable. Maximum offsite dose from all possible pathways was shown to be well within the design objectives of Appendix I of 10CFR50.
Tritium exists as a gas or combined in water. In the presence of water the majority of the tritium will remain with the water and not appear as a gas.
The tritium release rates in the plant offgases and liquid radwaste discharges result in concentration well below the 10 CFR 20 limits. The dose rate to the environs due to tritium is negligible and therefore not considered significant in the radioactive waste systems.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-11 However, as a further means of lowering the potential for tritium to enter local groundwater, the discharge point of liquid radwaste and steam generator blowdown was extended from its original point of discharge at the head of the circulating water discharge canal to just upstream of the circulating water canal discharge structure at the Mississippi River. The extended discharge header ensures that any tritium that may be present in the liquid release is not retained within the discharge canal as it travels down its entire length but is mixed into the circulating water discharge immediately before it enters the river (Reference 3). The extension effectively bypasses the Circulating Water Monitor (R-21). This is discussed in USAR Section 7.5.2.
Protection against accident and/or off standard releases of wastes is provided by appropriate system interlocks; detection instrumentation alarms on off standard conditions and automatically closes the discharge valve. All radwaste tankage, filters and equipment are either contained in a Class I* portion of the plant or specially constructed areas to provide a substantial degree of control of the wastes. These arrangements are provided to assure that in the event of a failure of the liquid waste systems or errors in operation of the system the potential for inadvertent release of liquids is minimal. This assures control and containment of any leaks, spills, or overflows from the equipment.
The liquid waste system components are found in the containment, auxiliary, and radwaste buildings. In addition, all vessels which are used for waste storage are located inside structures such as sumps, dikes or vaults which will retain any spilled liquid. The reactor coolant drain tank is located at the ground floor of the containment and can be pumped to the liquid waste system.
The Miscellaneous Drains Collection Tank, ADT Collection Tanks, ADT Condensate Receiver Tanks, ADT Monitor Tanks, ADT evaporator and waste concentrates tank (located in the radwaste building) were designed Class III*. The waste concentrates tank is in a vaulted room that holds its entire volume. The rest of the tanks are located either in rooms with dikes or drain directly to the radwaste building sump.
The radwaste system was designed to permit operation of the rest of the plant for extended periods without requiring its being continually operable.
The CVCS holdup tanks are also equipped with safety pressure relief valves and designed to withstand the established seismic forces at the site. Liquids in the Chemical and Volume Control System flowing into and out of these tanks are controlled by manual operation and governed by prescribed administrative procedures.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 36 Page 9.2-12 The volume control tank design philosophy is similar in many respects to that applied for the CVCS holdup tanks. Level alarms, pressure relief valves and tank isolation and 604000000354 valve control assure that a safe condition is maintained during system operation.
Excess letdown flow is directed either to the CVCS holdup tanks via the reactor coolant drain or the volume control tank. The waste holdup tank is a horizontal tank which is continuously maintained at atmospheric pressure. Its vent is routed to the auxiliary building exhaust ducts. Should a complete failure of any tank containing radioactive liquid wastes occur its contents will be retained. The potential hazard from these processes or waste liquid releases is derived only from the volatilized components. The potential for accidental release is summarized in Section 14.5.2.
All radioactive liquid waste processed through the radioactive waste collection and treatment systems is discharged to the circulating water discharge channel. The probability of unmonitored releases to the discharge channel is exceedingly small because at least two barriers must be abridged to permit release; e.g. steam generator tubes and condenser tubes or residual heat exchanger and component cooling heat exchanger. In addition the pressure differential, in essentially all operating modes, opposes leakage into the discharge and the Circulating Water Monitor would indicate abnormal radiation levels.
After waste disposal system liquid has been sampled for radiochemical batch analysis and is determined acceptable for release, the liquid is transferred through a radiation trip valve to the auxiliary building standpipe, then on to the waste liquid discharge header.
Periodic samples are taken from the discharge channel before it enters the river for radiation monitoring to further confirm proper operation of the circulating water monitor.
Although the radiochemical analysis establishes the basis for releases, the radiation monitors provide surveillance over the release operation and automatically close the discharge valve if the liquid activity release rate would exceed the limits of 10CFR20.
The most severe airborne radioactivity concentrations which might be postulated to result from open cycle cooling tower operation was investigated and was compared with the concentration limits specified in Table II of 10CFR20. It was observed that even though the basic assumptions relating to the composition of activity and the associated release rates are factors of 10 to 1000 greater than what might be experienced under any conceivable abnormal situation, the airborne concentrations in the cooling tower vapor at the site boundary would still be well below of the 10CFR20 limits.
Periodic sampling of the intake water for radioactivity and appropriate environs monitoring are performed as a further precaution that no unforeseen abnormal condition results in undesirable radiological effects.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 31 Page 9.3-1 9.3     GASEOUS RADWASTE SYSTEM 9.3.1     Design Basis 9.3.1.1     Gaseous Radwaste System The gaseous radwaste system is designed to process and control the release of gaseous radioactive effluents to the site environs so that the offsite radiation dose rate does not exceed the limits specified in 10CFR20 and the design objectives of Appendix I to 10CFR50 are met.
9.3.1.2     Monitoring Fuel and Waste Storage Areas Criterion: Monitoring and alarm instrumentation shall be provided for fuel and waste storage and associated handling areas for conditions that might result in loss of capability to remove decay heat and to detect excessive radiation levels.
(GDC 18)
Monitoring and alarm instrumentation is provided for fuel and waste storage and handling areas to detect deviation from normal water level, inadequate cooling and excessive radiation levels. Radiation monitors are provided to maintain surveillance over the release of radioactive gases and liquids, and the permanent record of activity releases is provided by radiochemical analysis of known quantities of waste.
A controlled ventilation system removes gaseous radioactivity from the atmosphere of the fuel storage and waste treating areas of the auxiliary building and discharges it to the atmosphere via the auxiliary building vent. Radiation monitors are in continuous service in these areas to actuate high-radiation alarms on the control board annunciator, as described in Section 7.5.3.
9.3.1.3     Protection Against Radioactivity Release from Spent Fuel and Waste Storage Areas Criterion: Provisions shall be made in the design of fuel and waste storage facilities such that no undue risk to the health and safety of the public could result from an accidental release of radioactivity. (GDC 69)
All waste handling and storage facilities are contained and equipment is designed so that accidental releases directly to the atmosphere are monitored and will not exceed the guidelines of 10CFR100, as described in Sections 9.1.2, 14.5.2, and 14.5.3.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 31 Page 9.3-2 9.3.2     Description During plant operation, potentially radioactive gases are received mainly from the following sources:
: a. Displacement of cover gases as liquids accumulate in various tanks.
: b. Miscellaneous equipment vents and relief tanks.
: c. Sampling operations and automatic gas analysis for hydrogen and oxygen in cover gases.
: d. Nitrogen stripping of reactor coolant to remove hydrogen during shutdown operations.
The waste gas system consists of two interconnected process loops. A low level loop and a high level loop. The waste gas system is very similar to the Westinghouse Environmental Assurance System with the exception of the volume of a gas decay tank which is slightly smaller than the EAS.
The low level loop is designed to contain and process influent gases from sources a through d above. It is also used to process and contain fission gases resulting from occassional hydrogen stripping of the reactor coolant. Gases vented into the low level loop vent header flow to the waste gas compressor suction header. One of two compressors is in continuous operation with the second unit instrumented to act as backup for peak load conditions or failure of the first unit. Under normal operating conditions, the gas flow from the compressor is split through the hydrogen recombiner and to the decay tanks. Outlet flow from the gas decay tanks is varied to maintain proper pressure in the vent header and holdup tank header.
When the tank in service becomes pressurized to approximately 110 psig, a pressure transmitter automatically closes the inlet valve to that tank, opens the inlet valve to the backup tank and sounds an alarm to alert the operator so a new backup tank may be selected. Pressure indicators are provided to aid the operator in selecting the backup tank. Any net flow into or out of the loop accumulates in, or is made up from, the gas decay tanks. A backup supply of gas is provided from the nitrogen header in the event that return flow from the gas decay tanks to the CVCS holdup tanks is not available.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 31 Page 9.3-3 Most of the gas received by the low level loop during normal operation is cover gas displaced from the Chemical and Volume Control System holdup tanks as they fill with liquid. This gas is primarily nitrogen, but it also contains hydrogen originally dissolved in the letdown coolant. As the gas circulates around the loop, hydrogen is oxidized to water vapor and condensed in the recombiner. The gas decay tank capacity is adequate for storing all of the holdup tank cover gas when those tanks are filled with liquid. There is normally no need to vent the system to atmosphere, although an occasional discharge will be required to dispose of gases accumulated from shutdown operations and inflows from miscellaneous vents.
The high level waste gas loop was designed to process and contain gases with high activity received during infrequent hydrogen stripping of the reactor coolant to remove fission gases. Since reactor coolant fission gas is usually at a low activity level, the high level waste gas loop is normally not used. The high level loop compressor is normally aligned to the low level loop and is used during times of high demand. The high level gas decay tanks are normally used for reserve holdup capacity of low level loop gas.
This helps to minimize the frequency of gas decay tank releases.
When a low level loop gas decay tank must be discharged to the environment, its contents are sampled and analyzed to determine and record the activity to be released, and then will be discharged to the auxiliary building vent at a controlled rate. The isolation valve in the discharge line is closed automatically by a high activity level indication in the auxiliary building vent.
During operation, gas samples are drawn automatically from the in service low level loop gas decay tank, and the various tanks vented to the low level waste gas system.
The sample stream is automatically analyzed to determine the hydrogen and oxygen content. There should be no significant oxygen concentration in any of the tanks. An alarm will warn the operator if any sample shows two percent or higher of oxygen by volume.
The nitrogen and hydrogen supply systems shown on Figure 9.1-6 are designed to provide a supply of gas to various NSSS components. Operation is identical for both systems. Each system consists essentially of multiple banks of gas cylinders, dual manifolds, each with pressure regulator, and branch line to the various pieces of equipment. Each branch line has a shut off valve and a pressure control valve.
Two independent manifolds are provided for each system, one for normal operation and one spare. Each manifold has a pressure regulator, pressure indicator, a common pressure switch and a common alarm. When the gas cylinder banks supplying the operating manifold are low in pressure, an alarm sounds. The exhausted gas cylinders are removed from service and another group of cylinders are placed in service.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 31 Page 9.3-4 9.3.2.1     Components 9.3.2.1.1    Gas Decay Tanks Fifteen welded carbon steel tanks are provided to accumulate and contain radioactive gases. Nine tanks are supplied in the low level loop to store cover gases displaced from various tanks until they are returned to the tanks. The remaining six tanks are supplied in the high level loop.
9.3.2.1.2    Compressors Three compressors are provided to circulate gases around the two process loops.
These compressors are water-sealed centrifugal machines. All three compressors are available for use in the low level loop. One compressor is normally in service on the low level loop with a second compressor in standby. Operation of two compressors in the low level loop is controlled by the vent header pressure. Two of the compressors are available for use on the high level loop if needed. Construction is primarily carbon steel.
A mechanical seal is provided in each of the three units to minimize leakage of seal water.
9.3.2.1.3    Recombiners One recombiner is provided in each of the two waste gas system process loops. The units are skid mounted packages complete with separate control panels for remote installation. Instrumentation provided in the recombiner will control oxygen addition to maintain effluent hydrogen concentration. The catalyst is palladium on kaolin beads approximately one-eighth inch in diameter.
9.3.2.1.4    Nitrogen Manifold Nitrogen is supplied at a nominal pressure of 100 psig to purge the vapor spaces of various NSSS components. Purging reduces the hydrogen concentration or replaces the fluid that has been removed. Each of the dual manifolds are provided with gas supply connections from a nitrogen storage facility.
9.3.2.1.5    Hydrogen Manifold Hydrogen is supplied at a nominal pressure of 100 psig to the main generators, volume control tanks and to other various NSSS components from a central storage facility.
Hydrogen is used as the heat transfer medium to cool the main generators and for reducing the oxygen concentration in the volume control tank to less than 5% by 01145513 volume. Hydrogen is supplied to the plant systems by a remote hydrogen storage facility outside of the turbine building, installed under modification EC12191 (Ref. 5).

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 31 Page 9.3-5 The remote hydrogen storage facility consists of three permanent tube banks connected 01253589 to a common header. On each of the three banks, the individual tubes are joined together by a manifold. Each of the three banks can be isolated from the common header individually by a single isolation valve between the tube bank manifold and the header. Only one tube bank is placed into service at a given time, in order to limit the 01145513 volume of hydrogen being supplied to the header. The tube banks are refilled on site by a delivery tube trailer.
The design criteria for the storage facility were selected in accordance with the Electrical Power Research Institute report NP-5283-SR-A, Guidelines for Permanent BWR Hydrogen Water Chemistry Installations - 1987 Revision (Ref. 4), and associated NRC Safety Evaluation Report, dated July 1987. The hydrogen storage facility meets the design criteria as prescribed within the aforementioned documents.
9.3.2.1.6      Gas Analyzer An automatic gas analyzer is provided to monitor the concentrations of oxygen and hydrogen in the cover gas of tanks and vessels which might accumulate a hazardous mixture of the two gases.
9.3.3       Performance Analysis Gaseous wastes consist primarily of hydrogen stripped from coolant discharged to the CVCS holdup tanks during boron dilution, nitrogen and hydrogen gases purged from the volume control tank, and nitrogen from the closed gas blanketing system. Hydrogen is removed by oxidation and condensation in the recombiners. Nitrogen from the gas blanketing system is stored and reused. The majority of gas discharged from the system is nitrogen received as a result of shutdown operations and miscellaneous vents.
The gaseous waste process flow diagram is shown on Tables 9.3-2 and 9.3-3. These tables illustrate flow rates, temperatures, pressures, and specific isotope radioactivity.
No minimum holdup time is specified. The design of the high level loop provides for indefinite holdup.
Gaseous source terms were calculated using the GALE code and are presented in Table 9.3-1. Detailed assumptions and methodology used in the calculation are discussed in Reference 1. Maximum offsite dose from all possible pathways was shown to be well within the Design Objectives of Appendix I to 10CFR50. The releases are described and their effects are summarized in Section 14.5.3.1.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 31 Page 9.3-6 THIS PAGE IS LEFT INTENTIONALLY BLANK

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 13 Page 9.4-1 9.4     SOLID RADWASTE SYSTEM 9.4.1    Design Basis The solid radwaste system is designed to package, store and provide shielded storage facilities for solid wastes and to allow temporary storage prior to shipment from the plant for offsite processing or disposal. The system is designed to meet the requirements of 10CFR20, 10CFR71, and 49CFR170-189.
9.4.2    Description Solid wastes consist mainly of dry active waste (DAW) such as contaminated paper, plastic, wood, etc., contaminated metals and spent resin.
DAW may be compacted for disposal or storage or may be sent off-site for further processing, such as sorting or incineration. The by-product of such off-site processing, for example, incinerator ash, may be returned to the plant site for storage if no disposal site is available.
Contaminated metals may be compacted on-site for storage or disposal. Contaminated metals may also be sent off-site for processing such as decontamination or metal 95130 melting.
Spent resin originates in any of several system ion exchangers.
Spent resin is flushed to a resin shipping liner for disposal or off-site processing.
Alternatively, resin may be placed in on-site storage if a disposal site is not available.
9.4.3    Performance Analysis Solid wastes received at disposal sites must meet the requirements of 10CFR61 relating to waste form and classification as well as disposal site-specific regulations.
Annual generation of DAW is estimated at approximately 50,000 lbs.
Annual generation of spent bead resin is estimated at approximately 500 cu. ft.

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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 31 Page 9.5-1

==9.5        REFERENCES==
: 1. Letter, L O Mayer (NSP) to D. L. Ziemann (NRC), Appendix I Submittals, June 4, 1976 and July 21, 1976. (10501/1800) (10501/2070)
: 2. Prairie Island Modification 92L377, Waste Liquid Discharge Header Replacement.
: 3. Prairie Island Modification 89Y065, Waste Liquid Discharge Line Extension.
: 4. EPRI NP-5283-SR-A, Guidelines for Permanent BWR Hydrogen Water Chemistry Installations - 1987 Revision, September 1987.
01145513
: 5. Passport Engineering Change #12191, Hydrogen Storage System.

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PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 32 TABLE 9.1-1 WASTE DISPOSAL SYSTEM PERFORMANCE DATA 01353916 Original Plant Design Life                                      40 years Normal process capacity, liquids                                2 gpm Estimated Annual liquid input to Radwaste System(*)
Volume (2 units)                                        531,240 gal.
Activity (2)
Tritium Design Value (2 units)                     5.2 x 103 curies Tritium, Expected Value (2 units)                  8.2 x 102 curies Other (2 units)                                    8.04 curies Annual gaseous release Activity (2 units)                                      1278 curies/year Annual generation of Dry Active Waste (2 units)                 50,000 lbs Annual generation of spent resin                                500 ft3 01-082
(*)
estimated based on FSAR Table 11.1-4, equilibrium cycle

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.1-2 WASTE DISPOSAL COMPONENTS CODE REQUIREMENTS Component                                                       Code Chemical Drain Tank                                              No code Reactor Coolant Drain Tank                                       ASME III, (1) Class C Sump Tanks                                                       No code Monitor Tanks                                                    No code Waste Holdup Tanks                                               No code Collection Tanks                                                 No code Waste Condensate Tank                                            No code Ion-Exchange Shells                                              No code Laundry and Hot Shower Tank                                      No code 01-082 Waste Filter                                                     ASME III, (1) Class C Piping and Valves                                                USAS-B31.1 (2) Section 1 Gas Decay Tank                                                   ASME III, (1) Class C 01-082 Recombiner                                                       ASME III, (1) Class C (1)
ASME III - American Society of Mechanical Engineers, Boiler and Pressure Vessel Code, Section III, Nuclear Vessels (2)
USAS-B31.1 - Code for pressure piping American Standards Association and special nuclear casses where applicable.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 28 TABLE 9.1-3 COMPONENT 

==SUMMARY==
DATA (Page 1 of 4)
Tanks Design    Design Pressure   Temp Qty Type          Volume         psig       F      Material(1)     05-054 Reactor Coolant Drain (per unit)            1     Horiz      350 gal        25        267          ss Laundry &
Hot Shower                 2*     Vert       700 gal        Atm       180          ss Chemical Drain             1*     Vert       600 gal        Atm       180          ss Aerated Sump               1*     Vert       600 gal        Atm       180          ss Non-Aerated Sump           1*     Vert       300 gal        Atm       125          ss Waste Holdup               1*     Horiz     24,490 gal      Atm       180          ss Waste Condensate           2*     Vert       1,000 gal      Atm       180          ss Gas Decay                  15*    Vert        470 ft3       150       150          cs SGB Flash (per unit)        1     Vert       2,000 gal      100       325          cs Aerated Drains Monitor                    2*     Vert       1,000 gal      Atm       125          ss SGB Holdup (per unit)                  2     Vert      10,000 gal      Atm       135          ss SGB Monitor (per unit)                  2     Vert      10,000 gal      Atm       135          ss ADT Collection             2*     Vert       3,000 gal      Atm       180          ss Misc. Drains Collection                 1*     Vert       3,000 gal      Atm       180          ss Laundry Sludge             1*     Vert       800 gal        Atm       180          ss Coagulation                1*     Vert       900 gal        Atm       180          ss ADT Condensate             2*     Vert       2,400 gal      Atm       180          ss ADT Monitor                2*     Vert       5,000 gal      Atm       180          ss Spent Resin                1*     Vert       2,200 gal      30        180          ss Waste Concentrate          1*     Vert       1,700 gal      33        180          ss          05-054 (1)
Material contacting fluid (2)
Mechanical seal provided
* Shared by Units 1 and 2

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 28 TABLE 9.1-3 COMPONENT 

==SUMMARY==
DATA (Page 2 of 4)
Pumps Design    Design Flow       Head   Pressure   Temp 05-054 (1)
Qty   Type       gpm         ft      psig       F     Material 11 Reactor Coolant Drain Tank                   Horiz (2)
(per unit)              1    cent        60         200     150       267         ss 12 Reactor Coolant Drain Tank                   Horiz (2)
(per unit)              1    cent       200         200     150       267         ss Chemical Drain               Horiz (2)
Tank                    1*   cent        20         100     375       150         ss Laundry                 2*   Horiz       20         100     150       150         ss (2) cent SGB Flash Tank               Horiz (2)
Transfer (per unit)     1    cent       120         130     150       140         ss 11 SGB Holdup                Horiz (2)
Tank (per unit)         1    cent       120         310     150       140         ss 12 SGB Holdup                Horiz (2)
Drain Tk (per unit)     1    cent        60         125     150       140         ss SGB Monitor                  Horiz (2)
Drain Tk (per unit)     1    cent        60         125     150       125         ss Aerated Drains               Horiz (2)
Monitor Tank            1*   cent        60         150     150       125         ss Non-Aerated                  Horiz (2)
Sump Tank               1*   cent        60         80      150       125         ss Laundry & Hot                Horiz (2)
Shower Tank             2*   cent        60         100     150       125         ss Aerated Sump                 Horiz (2)
Tank                    1*   cent        20         100     150       150         ss Backup Sump                  Horiz (2)
Tank                    1*   cent        20         100     150       150         ss Waste                        Horiz (2)
Evaporator Feed         1*   cent        20         100     150       150         ss Waste Condensate             Horiz (2)
Tank                    2*   cent        20         100     150       150         ss (1)
Material contacting fluid (2)
Mechanical seal provided
* Shared by Units 1 and 2

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 28 TABLE 9.1-3 COMPONENT 

==SUMMARY==
DATA (Page 3 of 4)
Pumps Design         Design Flow           Head         Pressure        Temp 05-054 (1)
Qty       Type            gpm             ft            psig            F          Material ADT Collection                       Horiz (2)
Tank                       2*        cent             20            110               150          200            ss Misc. Collection                      Vert (2)
Tank                       2*        cent             60            100               150          200            ss Coagulation Tank           1*        Horiz            20               80             150          125            ss (2) cent Laundry Sludge                       Horiz (2)
Tank                       1*        cent             30            115               150          125            ss ADT Condensate                       Horiz (2)
Receiver Tank              2*        cent             60            100               150          200            ss ADT Monitor                          Horiz (2)
Tank                       2*        cent             60            100               150          200            ss 121 Spent Resin            1*        Horiz            30            145               150          125            ss (2) cent 122 Spent Resin            1*        Horiz            20            200               150          125            ss diaphragm Waste Concentrate                    Horiz            20            200               150          125            ss Tank                       1*     diaphragm Heat Exchangers Shell           Tube Design          Design Qty                Shell     Tube                             Press/          Press/
(per               Flow      Flow                             Temp            Temp          Shell Tube unit) Type         (lb/hr)   (lb/hr)         Btu/hr           (psi)/(F)      (psi)/(F)    Matl. Matl.
SGB Heat      1     Shell &      75,000    6,900**         1,159,200        150/130         150/130       cs       ss Exch. 11            Tube SGB Heat      1     Shell &      57,776    2,481,862       10,377,000       150/130         600/150       cs       ss Exch. 12            Tube
 **    This is a maximum blowdown liquid capacity as a result of blowdown system modifications. This corresponds to a blowdown rate of approximately 15 gpm per steam generator.
(1)
Material contacting fluid (2)
Mechanical seal provided
* Shared by Units 1 and 2

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 28 TABLE 9.1-3 COMPONENT 

==SUMMARY==
DATA (Page 4 of 4)
Strainer and Filter Qty    Flow       Design       Design   Housing gpm      Pressure      Temp     Material psig         F Filters SGB Reclaim                    2       20          150        125         cs Aerated Drain                 1*       20          150        125         ss Non-Aerated Drain             1*       20          150        125         ss 123/124 ADT                   2*       40          150        125         ss 123 ADT IX                    1*       20          150        125         ss 121/122 ADT                   2*       20          150        125         ss Strainers SGB Ion Exchanger              2       60          150        125         ss Miscellaneous Qty           Capacity       Type (2)
Waste Gas Compressors                       3*           40 CFM      Horiz     cent ADT Ion Exchanger                           3*            60 gpm (1)
Material contacting fluid (2)
Mechanical seal provided
* Shared by Units 1 and 2

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.2-1 PERFORMANCE DATA AND SERVICE REQUIREMENTS (2 GPM Waste Evaporator) 01-082 Equipment not used.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.2-2 PERFORMANCE DATA AND SERVICE REQUIREMENTS (5 GPM ADT Evaporator) 01-082 Equipment not used.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.2-3 LIQUID SOURCE TERMS FROM THE PRAIRIE ISLAND PLANT (PER UNIT)
Page 1 of 2 ANNUAL RELEASES TO DISCHARGE CANAL Coolant Concentrations                                                                  Adjusted   Detergent       Total Nuclide    Half-Life     Primary      Secondary        Boron RS    Misc. Secondary   Turb Bldg   Total LWS    Total      Wastes Wastes (Days)     (Micro CI/ML)   (Micro CI/ML)   (Curies)   (Curies)    (Curies)   (Curies)     (Curies)   (CI/YR)     (CI/YR)       (CI/YR)
CORROSION AND ACTIVATION PRODUCTS CR 51    2.78E+01    1.72E-05       2.27E-07         .00001    .00016      .00027      .00000      .00044      .00054     0.00000       .00054 MN 54    3.03E+02    2.80E-04          5.43E-08      .00000    .00001      .00006      .00000      .00009      .00011     .00100        .00110 FE 55    9.50E+02    1.44E-03          1.90E-07      .00001    .00014      .00023      .00000      .00038      .00046     0.00000       .00046 01-082 FE 59    4.50E+01    9.03E-04          1.39E-07      .00000    .00009      .00017      .00000      .00026      .00031     0.00000       .00031 CO 58    7.13E+01    1.44E-02          1.93E-06      .00009    .00139      .00230      .00002      .00379      .00459     .00400        .00460 CO 60    1.92E+03    1.80E-03          2.44E-07      .00001    .00017      .00029      .00000      .00048      .00058     .00870        .00930 NP239     2.35E+00    1.12E-03          1.27E-07      .00000    .00009      .00015      .00000      .00024      .00029     0.00000       .00029 FISSION PRODUCTS BR 83    1.00E-01    5.28E-03         2.90E-07      .00000     .00002      .00024      .00001      .00026      .00032     0.00000       .00032 BR 84    2.21E-02    2.97E-03         5.51E-08      0.00000    .00000      .00001      .00000      .00001      .00001     0.00000       .00001 01-082 01-082 RB 86    1.87E+01    8.05E-05         1.21E-08      .00000     .00038      .00014      .00000      .00052      .00063     0.00000       .00063 RB 88    1.24E-02    2.30E-01         2.34E-06      0.00000    .00000      .00133      .00000      .00133      .00160     0.00000       .00160 SR 89    5.20E+01    3.16E-04         5.55E-08      .00000     .00003      .00007      .00000      .00010      .00012     0.00000       .00012 SR 91    4.03E-01    6.65E-04         6.04E-08      .00000     .00002      .00007      .00000      .00009      .00010     0.00000       .00010 Y 91M    3.47E-02    4.08E-04         7.75E-08      .00000     .00001      .00006      .00000      .00007      .00009     0.00000       .00009 Y 91    5.88E+01    5.78E-05         6.30E-09      .00000     .00001      .00001      .00000      .00002      .00002     0.00000       .00002 ZR 95    6.50E+01    5.42E-05         8.28E-09      .00000     .00001      .00001      .00000      .00002      .00002     0.00000       .00002 NB 95    3.50E+01    4.52E-05         8.43E-09      .00000     .00000      .00001      .00000      .00001      .00002     0.00000       .00002 MO 99     2.79E+00    7.82E-02         1.20E-05      .00004     .00626      .01415      .00011      .02057      .02488     0.00000       .02500 TC 99M    2.50E-01    5.05E-02         3.91E-05      .00000     .00557      .04190      .00025      .04775      .05776     0.00000       .05800 RU 103    3.96E+01    4.07E-05         5.60E-09      .00000     .00000      .00001      .00000      .00001      .00001     .00014        .00015 RM 103M    3.96E-02    5.09E-05         5.04E-08      .00000     .00000      .00003      .00000      .00003      .00004     0.00000       .00004 TE 127M    1.09E+02    2.53E-04         2.46E-08      .00000     .00002      .00003      .00000      .00006      .00007     0.00000       .00007 TE 127    3.92E-01    8.71E-04         2.05E-07      .00000     .00004      .00022      .00000      .00027      .00033     0.00000       .00033 TE 129M    3.40E+01    1.27E-03         1.69E-07      .00001     .00012      .00020      .00000      .00035      .00040     0.00000       .00040 01-082 TE 129    4.79E-02    1.80E-05         1.45E-06      .00000     .00008      .00086      .00000      .00094      .00114     0.00000       .00110 I 130   5.17E-01    2.11E-03         2.18E-07      .00000     .00008      .00024      .00002      .00034      .00041     0.00000       .00041

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.2-3 LIQUID SOURCE TERMS FROM THE PRAIRIE ISLAND PLANT (PER UNIT)
Page 2 of 2 ANNUAL RELEASES TO DISCHARGE CANAL Coolant Concentrations                                                                  Adjusted   Detergent      Total Nuclide      Half-Life     Primary      Secondary        Boron RS    Misc. Secondary   Turb Bldg   Total LWS    Total      Wastes Wastes (Days)   (Micro CI/ML)   (Micro CI/ML)   (Curies)   (Curies)    (Curies)   (Curies)     (Curies)   (CI/YR)     (CI/YR)       (CI/YR)
TE 131M     1.25E+00      2.40E-03        2.75E-07       .00000    .00015      .00032      .00000      .00047      .00057     0.00000       .00057 TE 131     1.74E-02      1.26E-03        1.41E-06       .00000    .00008      .00024      .00000      .00027      .00033     0.00000       .00033 I 131     8.05E+00      2.45E-01        3.46E-05       .00508    .02216      .04110      .00337      .07171      .00675     .00006        .08700 TE 132     3.25E+00      2.50E-02        3.06E-06       .00002    .00206      .00341      .00003      .00572      .00691     0.00000       .00690 I 132     9.58E-02      1.10E-01        2.19E-05       .00002    .00244      .01880      .00038      .02163      .02617     0.00000       .02600 I 133     8.75E-01      3.70E-01        4.25E-05       .00016    .02002      .04856      .00347      .07221      .08735     0.00000       .08700 I 134     3.67E-02      5.32E-02        1.46E-06       .00000    .00001      .00062      .00000      .00063      .00076     0.00000       .00076 CS 134     7.49E+02      2.35E-02        3.39E-06       .00035    .11364      .04047      .00003      .15449      .18688     .01300        .20000 I 135     2.79E-01      1.98E-01        1.72E-05       .00000    .00392      .01792      .00092      .02276      .02753     0.00000       .02000 CS 136     1.30E+01      1.24E-02        1.56E-06       .00008    .05733      .01862      .00002      .07605      .09199     0.00000       .09200 CS 137     1.10E+04      1.69E-02        2.26E-06       .00025    .08186      .02693      .00002      .10907      .13193     .02400        .16000 BA 137M     1.77E-03      1.85E-02        2.48E-05       .00024    .07654      .02518      .00002      .10198      .12336     0.00000       .12000        01-082 BA 140     1.28E+01      2.00E-04        2.70E-08       .00000    .00002      .00003      .00000      .00005      .00006     0.00000       .00006 LA 140     1.68E+00      1.42E-04        3.86E-08       .00000    .00002      .00005      .00000      .00006      .00007     0.00000       .00007 CE 141     3.24E+01      6.33E-05        8.46E-09       .00000    .00001      .00001      .00000      .00002      .00002     0.00000       .00002 PR 143     1.37E+01      4.54E-05        5.95E-09       .00000    .00000      .00001      .00000      .00001      .00001     0.00000       .00001 CE 144     2.84E+02      2.98E-05        5.43E-09       .00000    .00000      .00001      .00000      .00001      .00001     .00520        .00520 PR 144     1.20E-02      3.79E-05        5.83E-08       .00000    .00000      .00001      .00000      .00001      .00001     0.00000       .00002 01-082 ALL OTHERS                  4.76E-08        3.09E-08       .00000    .00001      .00002      .00000      .00003      .00003       0.0         .00003 TOTAL (EXCEPT TRITIUM)             1.47E+00        2.14E-04       .00642    .39494      .30556      .00868      .71561      .86561     .06234        .93000 TRITIUM RELEASE                     330 CURIES PER YEAR

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.2-4 PRAIRIE ISLAND LIQUID RADWASTE SYSTEM EQUIPMENT DRAINS                          BLOWDOWN SHIM BLEED                  & CLEAN WASTE          DIRTY WASTES         WASTES         DETERGENT WASTES
: 1. Sources                            Reactor Coolant              Non-Aerated Drain       Aerated Darin      Blowdown          Laundry and Hot Letdown                   System & Reactor           System         from Steam          Shower Drains Coolant Drain Tank                         Generator
: 2. Flow Rate (gpd)                         1,440                          362                 1,000             86,300                 450
: 3. Activity (FPCA)                           1.0                           1.0                 0.07               --                    --
: 4. Collection Tank Volume (gal)            65,830                       65,830                3,000             2,000                  600
: 5. Collection Rate (gpd)                   1,802*                       1,802*                1,000             86,300                 450
: 6. Collection Time (days)                   29.2                          29.2                 1.2              0.009                  1.07
: 7. Processing Rate (gpm)                     15                            15                   20                20                    20
: 8. Processing Time (days)                   2.44                          2.44                0.042             0.028                 0.017
: 9. Discharge Tank Volume (gal)             10,000                       10,000                5,000             10,000              Same as Collection Tank 01-082
: 10. Discharge Rate (gpm)                     100                           100                   60                60                Same as Collection Tank
: 11. Discharge Time (days)                   0.055                         0.055                0.023             0.046               Same as Collection Tank
: 12. Fraction of Processed Stream             1.0                           1.0                  1.0               1.0                   1.0 Released 2 Evaporator                  Evaporator            2 ADT Ion         SGBT Ion Feed Ion                   condensate            Exchangers         Exchanger Exchangers (cation)          Demineralizer (anion)    (Mixed Bed)       (Mixed Bed)
: 13. DFs          Iodine                     1(1)                         102                 102 (10)            102 01-082
: 14.                 Cs, Rb                    10(10)                          1                  2 (10)             10
: 15.                 Others                    10(10)                          1                 102 (10)            102
: 16. Regenerant Time (days)                   Not                          Not                   Not               Not                NA
: 17. Regenerant Volume (gal)              Regenerated                  Regenerated           Regenerated       Regenerated
: 18. Regenerant Activity
: 19. Fraction of Regenerants Discharged
: 20. Treatment of Regenerants
: 21. Source Terms                       See Table 9.2-3               See Table 9.2-3       See Table 9.2-3   See Table 9.2-3     See Table 9.2-3
 *Sum of Shim Bleed, Equipment Wastes, and Clean Waste input flows.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.3-1 GASEOUS SOURCE TERMS FROM THE PRAIRIE ISLAND PLANT (PER UNIT)
Page 1 of 2 GASEOUS RELEASE RATE - CURIES PER YEAR Gas Stripping                           Building Ventilation PRIMARY              SECONDARY           SHUTDOWN           CONTINUOUS           REACTOR         AUXILIARY          TURBINE    BLOWDOWN      AIR EJECTOR     TOTAL COOLANT               COOLANT                                                                                                 VENT OFF GAS     EXHAUST (MICROCI/GM)          (MICROCI/GM)
KR-83M            2.418E-02             1.415E-08               0.0                 0.0               0.0              0.0             0.0         0.0            0.0           0.0 KR-85M             1.26E-01             7.529E-08               0.0                 0.0               0.0           3.0E+00            0.0         0.0          2.0E+00       5.0E+00 KR-85             7.313E-02             4.338E-08            1.5E+01             1.4E+02            2.2E+01         2.0E+00            0.0         0.0            0.0         1.8E+02 KR-87             6.917E-02             3.908E-08               0.0                 0.0               0.0           1.0E+00            0.0         0.0            0.0         1.0E+00 KR-88             2.299E-01             1.340E-07               0.0                 0.0             1.0E+00         5.0E+00            0.0         0.0          3.0E+00       9.0E+00 KR-89             5.776E-03             3.427E-09               0.0                 0.0               0.0              0.0             0.0         0.0            0.0           0.0 XE-131M           9.248E-02             5.522E-08               0.0                 0.0             2.1E+01         2.0E+00            0.0         0.0          1.0E+00       2.4E+01 01-081 XE-133M           2.328E-01             1.390E-07               0.0                 0.0             2.0E+01         5.0E+00            0.0         0.0          3.0E+00       2.8E+01 XE-133            1.738E+01             1.023E-05               0.0                 0.0             2.7E+03         3.7E+02            0.0         0.0          2.3E+02       3.3E+03 XE-135M           1.501E-02             8.808E-09               0.0                 0.0               0.0              0.0             0.0         0.0            0.0           0.0 XE-135            3.978E-01             2.336E-07               0.0                 0.0             6.0E+00         8.0E+00            0.0         0.0          5.0E+00       1.9E+01 XE-137            1.040E-02             6.119E-09               0.0                 0.0               0.0              0.0             0.0         0.0            0.0           0.0 XE-138            5.081E-02             2.936E-08               0.0                 0.0               0.0           1.0E+00            0.0         0.0            0.0         1.0E+00 TOTAL NOBLE GASES                                                                                                                                                         3.6E+03 I-131             2.449E-01             3.838E-05               0.0                 0.0             5.5E-04         3.9E-02          2.1E-03       0.0          2.4E-02       6.6E-02 I-133             3.697E-01             4.643E-05               0.0                 0.0             3.0E-04         5.9E-02          2.5E-03       0.0          3.7E-02       9.9E-02 TRITIUM GASEOUS RELEASE                                          330 CURIES/YR 0.0 appearing in the table indicates release is less than 1.0 Ci/yr for noble gas, 0.0001 Ci/yr for Iodine.

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.3-1 GASEOUS SOURCE TERMS FROM THE PRAIRIE ISLND PLANT (PER UNIT)
Page 2 of 2 AIRBORNE PARTICULATE RELEASE RATE-CURIES PER YEAR NUCLIDE 01-081 WASTE GAS          BUILDING VENTILATION     TOTAL SYSTEM        REACTOR           AUXILIARY MN-54        4.5E-05       2.0E-05         1.8E-02   1.8E-02 FE-59        1.5E-05       6.7E-06         6.0E-03   6.0E-03 CO-58        1.5E-04       6.7E-05         6.0E-02   6.0E-02 CO-60        7.0E-05       3.0E-05         2.7E-02   2.7E-02 SR-89        3.3E-06       1.5E-06         1.3E-03   1.3E-03 SR-90        6.0E-07       2.7E-07         2.4E-04   2.4E-04 CS-134        4.5E-05       2.0E-05         1.4E-02   1.8E-02 CS-137        7.5E-05       3.4E-05         3.0E-02   3.0E-02

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.3-2 PRAIRIE ISLAND - HIGH LEVEL LOOP PROCESS CONDITIONS AND MAXIMUM ISOTOPIC CONCENTRATIONS 01-081 01-081

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 TABLE 9.3-3 PRAIRIE ISLAND - LOW LEVEL LOOP PROCESS CONDITIONS 01-081 AND MAXIMUM ISOTOPIC CONCENTRATIONS 01-081

PRAIRIE ISLAND UPDATED SAFETY ANALYSIS REPORT USAR Section 9 Revision 23 THIS PAGE IS LEFT INTENTIONALLY BLANK

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CONTINUATION ZONES.
DRAINS (RCS)             ~ I ~               w  1 ~-                                                                                                                                                                                                                                                                                                                                                                      12-2WL-U                                                                                                                                                            PER ORR Pl-14-002 IXH 7) H-3         IRC-t-41         IRC-1-31I                                                  3-W0-I51R C2       NSR                             I
* 12~C-1-3I l2~C- ; -41                 110C013 (XH-1001-3) H-3 DWN1 KJF 1-15-14 13-WL-U                                                                                                                                                                                     VENT TO CONTAINMENT
                      > _ _-{';I'.}----''-'
CHK'D1 JKR 1-21-14
        'II SUMP C                                                               1-W0-151R                                                       VACUUM BREAKER ATMOSPHERE 760' ELEV.                                  VACUUM -                          l2WL-95-ll          1B       Ill   2-WD-151R 11-2WL-ll l.2-RC-2501R-ll                 Ill     1B                                                                                                MO    **:   EC-21789 (NF-39248)                  I           IA I Ill                            (l-WL-1) EXCESS LETDOWN                                                                                                                                                                                                                                            BREAKER                        /                                                                     12-2WL-Il                                                                                                                           APP'O: CMR 1-21-14 IWL-35-231         ~                                                  HEAT EXCHANGER                                                                                                                                                                                                                                                                                                    '---~III                                                                                                                                                                    82        [SSUED FDR IWL-95-tl IB IIICI NSR                                  ,,               ICVCS)                                                                                                                                                                                                                                   C2         NSR                                                                                                                                                                                                                                              CONSTRUCTION 1--'---~--'.J:_:'-          ~ 110E005 SH.I                                                                                                                                                                                       NSR       C2                                                                                                                                                                                                                                                                                 REMOVED SECONDARY SEAL C2 NSR          VENT                          *1,-.r ~ HIAW 1-38                                                                                                                                                                                                                                          1B         III                                                                                                                                                                                                                                   REFERENCE.CAPPED Ill      1B t
                                                                                   '....), (1-8146)                                                                                                                                                                                                                                                                                                                                                                                                                                    ACCUMULATOR                                              2-WL-1 LINE. ADDED ACCUMULATOR                L~'.J           m NSR          C2                                                                                                                                                                                                                                                                                                                                                                 DRAINS IS!Sl                                            CONTINUATION ZONES.
DRAIN <SIS)                           I"
                                  -,:.-J"--------,--,--t 1
LOOP "B" ~ - -                                                       VCT                                 WL-34-4                             II I        1B                                                                                                                                       3/4-WD-2505R-3                                                                                                                                                                                                                    !!0E034                                          OWN: JM8 1*23-14 SHEET 1                                           CHK'D; FJH 01-31-14 110E033 SH,!
CHIAW.1-441 11-88238)
_W_L__3- 1-_~
NSR         C2                    3/4-X42D             NOTE I                                                                                                                                                                  ('lfj-WL-3Al                                                                                                                                                                                                     (X-HIAW-1001 -61                                             MOD": EC-21790 9                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     REVIEWED1 RW                     01-31-14 I-X42D Ill      1B                                                                                                                                                                                                                                                                                                                                                1----IXl--                               '<<J - -      LOOP B                                                                                 PE CERT:
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      ~                      12-B823B) 1-WD-151R C                                                                                                                                                                                                                                                                                                                                                                                                                                                  .__ _ .. x ~ - - - - - - " x ~ - - - - ' - L DP B HOT LEG
* PE" C
                                                                                                                                                                                                                                                                                                                                                                                                                                                             . I.               I . I-             '         (XH-1001-3) G-6 APP'D: TM                03-07-14 I C-IB-2I I 2RC-18-1 I                                                                                                                      [SSUED FDR CONSTRUCTION WL-34-3                                                                                                                                                                                                                                                                                                                          U1 w
* NORMALLY CAPPED r                                                                CONNECT FDR DRAINDOWN                                                                REMOVED.REPLACED &
2WG-22-12 1-WD-15IR 11-WL-5)                                                                                                                                                                                                                                                                                I-WD-I51R-5 0
z          NSR Cl                                                                                                                                     CHANGED POSITIONS OF WL-34-19 & WL-43-1.
11-2WL-5) 1-WD-I52R-6                1-C36                                                                                                                                                                                                                                                                                OWN: FJH 09-12-14
                                                                                                                                                                                                                                                                                                                                                            '~--
(1-2WL-6Bl                                            1(11"~,,,2*x1*"                                                                                                                                                                                                                                          CHK'O; JMB 9-16-14 2"Xl' J--.--'TIII                                                                                                                     2WL-42-1                                                                                   l-X42D I h"*
1-C36                                                                                                                                                                                                                                                                                                                                                                                            MOD": EC-21790
                                                                                                                                                                                                                                                                                                                                                                                                 --j2WL-31-6I                                                                                                                                                                                   REVIEWED: RW                     9-16-14 l3/4-WL-6C)I                  WL-42-I c.s.                                           !-WD-152R-6                                                                                  2WL-41-1                                                              2WG-22-ll PE CERT1 l-X32D
                                                                                                                                                      ',_l                                  WL-41-1                                                                                                                                                        ->+<               3/4-2WL-6A                                                                                                                                                                                                                                   PE"
                                                                                                                                                       '.L~                                                                                                                                                                                                                                                                                                                                                                                                                                             *:
                                                                                                                                                                                                                                                                     *=
11- X32Dl                                                                                                                  11-2WL-6Al                            '""L..~             ,-WD-152R                                                                                                                                                                                                       APP'          TM         9-17-14
                                                                                                                                                      +
                                                                                                                                                                                                                                                                                                                                                *' (f) g I \ 1.. 1 S.S.
                                                                                                                                                                                                                                                                                                                                                                /
                                                                                                                                                                                                                                                                                                                                               , 2-8027,
                                                                                                                                  ,i-WD-152R &#xa3;T"                                                                                                                                                                                                                                2WL 13                                                                                                                                                                                                                AS BUILT-
                                                                                                                                                                                                                                                       * - N2 I -WL-6A)                                                                                                                                                                                                                                                                                                                                                                                                                                                     INCORPORATED A/E':s 11-WL-6Al rl)~:l--i,,,--1--,----'-----LN- -                      N2 -     -{)l::Jf---1J'f'-.H::-<h              NSR      C2                                                       3/4-42D                                                                                                                                                                                                          REV. 82 PER PRESSURIZER                                                                                 1-PCV-1014                  2-PCV-1014                                                                       PRESSURIZER                                                                                                                                                                                                                             ORR Pl-15-050
                                                                                                                                           ;   RELIEF TANK CRCSJ                                                            11-WL-6Bl      !-RA32RDB                    (-RA32RDB                               Ill      1B                             RELIEF TANK                !RCS)                                                                                                                                                                                                        CERTIFIED REV. 82 ,
D                                                                                                                                     '      - HI     110E005 IHIAW.1-7)
T 110E067-SH,3 (HIAW.1-125) 110E067 - SH.3 (HIAW.1-125)                           T              T 110E013 IH!AW 1001-31 HI TRANSFERRED TO RECORD TRACING.
D t-TIA                                                                                                                                                                                                                                                                                                                                                                                                                                                         OWN: MEA 4-17-15
())1/3)                I 2WL 27f---_                                                                                                                                                                                                                     0)
CHK'D1 RSA 6-1-15 MOD": EC-21790 APP'    *:    KJW        6-1-15 REACTOR COOLANT                                                                                                                                                           83        [SSUED FOR 0) co DRAIN TANK :1121                                                                                                                                                                    CONSTRUCTION ITEM: WDATRD            ./                                                                                                                                                DEL.NOTE 2 FROM 2WL-43 13-2WL-7)                                                                                                                                                       MOVE 2WL-36-8 OWNSTREAM Cl                                                                                                                                                                                                              m,:r 2*~C OF 2WL-43-1 & CHANGE                                                            'I""
z                                                                                                                                                                                                                A/B                                          TO BALL VALVE.
B                                                                                                                                                                                                                                                                                                                                             II)
I                                          OWN: JEK 5-4-15 C2   NSR                                                                                                                     :::,
CHK'O;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'I""
M  ***:     EC-25250 1B    Ill                                                                                                                    ...,
D
                                                                                                                                                                                                                                                                                                                                  ~
i1                                                                                                                                                                                                           REVIEWED; RSA 5-12-15 PE CERT1                                                                        0 TO LETDOWN HEAT EXCHANGER                                I PUMP PE*
FOR CONT, SEE X-HIAW-1001-4                              U1                               r     RCP 11:3 SEAL LEAKOFF                                                                                                                                                                                                  APP'    *:    TL        6-24-15 1((1/3) I10E039 SH.I I                                                                                       IHAIW.1001-4)                                                                               2-9163                                                                                                                       AS BUILT-2-DA42R                                                                                                             INCORPORATED A/E':s TO LETDOWN HEAT EXCHANGER E
* E REV, 83 PER FOR CONT. SEE X-HIAW-1-38 ORR Pl-15-178 I                                                                                                                                                                                                                                                                                                                                                                     CERTIFIED REV. 83 ,
I                                                                                                                                                                                                                                              2-WD-151R-8                                                                                                            TRANSFERRED TO
                                                                                                                                                                                                                        ,;J,        2-T58                                                         2WL 3                                                                                                                                                                  12-2WL-Bl                                                                                                          RECORD TRACING.
OWN: MEA 11-24-15 l ~
(2-2VC-199l                       NSR      C2                                                                                                                                                                                                                                                                         CHK'O; JLS 11-24-15 MOD*: EC-25250 2-T58 Ill      1B                                                                                                                                                                                                                                                                        APP'D: KJW 11-24-15 3-W~
13-2WL-I0Bl
_.--,./----r~~~-
T                                                                                                               {3/4 -2WL-52l LEGEND 3"X2" l-(3-WL-10Al TO REACTOR COOLANT DRAIN FILTERS                  ....._....,~-:....:-i>l<1-_;_..:..i>l<}-.YH--lh p
                                                                                                                                                                                                                                                                                                                                                ...i::=~c,:.~.i--____.=-v'l---....1...---t>-l '-                                                 3'Xl1/2",
C2         NSR              CLASS BREAK 1 ,
m        Im                     *A     TYPE
                                                                                                                                                                                                                                                                                                                        =
FOR CONT. SEE                                              2-9170B           2-9170A DWG. NF-39249       FOR CONT.SEE                           3-DA42R           3-DA42R                                                                                                                                                                                                                             Cl - SAFETY- RELATED; ISI CLASS 1 11-WL-119)                       DWG.NF-39250                              31736 1-X42D                                                                                                                                                                                                                                                                                                                                                                                                                                              CZ - SAFETY-RELATED; ISi CLASS 2 11-WL-116) 3-WD-!51R-7                                                                 WL-3I-17                                                                                                                 WL 39                                                                                                                                                                                                                                                                                                                   C3 - SAFETY-RELATED; ISi CLASS 3 3-WD-151R-10 13-WL-7)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       SR - SAFETY-RELATED FLUID BOUNDARY; (3-WL-100)
C2    NSR I-X42D                                1-X42D                                          C2    NSR             3-WD-15!R-10                                                                                                                                                                                                              NON-CODE CLASS NSRl C2 F                                                    WL-3I-16 3/4-X42D D WL-31-20 1-X42D
                                                                                                                                                                                       *Ill     1B
* 1B     Ill 2WL-31-41 1B    III 13-2WL-10Dl                                  ZWL-31-17 1-X42D NSR - NON-SAFETY-RELATED IA,18,IC,IIA,IIB & III DENOTES PIPING                                                *A        TYPES.
F 2-C58                                       2-WD-I51R-9                                                                                                                                                                                                                                                                                                                                                                      NOTES, 2-WD-!51R-9
* INDICATES UNIT N0,2                                                                               INDICATES UNIT NO. 1
                                                                                                        ~                                                                                                                                                                                                                                                                                                                                                                                                                                          3/4" 12-WL -9C)                                                                                                                                                                             12-2WL -9C)                                                                                                                                                                                  t,           PIPE BY'Jfi" TUBE INSERT RE VALVES USED IN UNIT NO.I                                                                          VALVES USED IN UNIT N0.2 3/4-X *~~        ;i2-WL-9B)                                                                                                                                                                                                                                                                                                                                                                                                               2.LOCATE CHECK VALVE IN A HORIZ, RUN
                                                                                                                                                                                                                                                                                                                                                                                                    -                                                                                                                                                +-
l3/4-2WL-53)              2WL-27-7                                                                                            OF PIPING NEAR THE RCDT.
12-2WL-9Bl OPEN SIGHT                            3. LOCATE CONN.AS CLOSE TO DRAIN OPEN SIGHTl                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  [ DRAIN                                            TANK AS POSSIBLE DRAIN
                     ,,    ,,'                                                                          1-WL-113                    & FLUSH           2-T58                                                                                                                                                                                                                                     11-2WL-45)                                                                                                                                  4.                       DENOTES CATEGORY I Y~-                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Y*.
3/4'X1/2'ITEM: WDAPRB                                                   '--IWL-40-21                                                                                                                                                                                                                              D           2-C58                                                                                                                                                            VENTILATION ZONE 12wfu-21 1
REACTOR COOLANT DRAIN TANK PUMPS 2-T58                                                 REACTOR COOLANT                                                     1 rFL.EL.           697'-0" FL.EL. 697'-6"                                                                                                 WL-31-22                                                                                                                                                                                                                                          2WL-31-22             2WL-31-21                       DRAIN TANK PUMPS                                                                                                 5. NUMBERS IN PARENTHESIS DENOTE
())1/3)                                                       I I                                          I ~===(]';'!~1/~3~) 11 -WL -108)                 1-X42D                                                                                                                                                                                                                                                                                                                                                                                                                         PS & E LINE NUMBERS.
_     INSIDE REACTOR                                                                                                                                                                                                                              3/4-X 42 D l3/4-2WL-51)                                                                                 I I                                             WL-31-21                                                                                                      OUTSIDE REACTOR _
2-T58                                                                                            6. (111/3) DENOTES EQUIP QA TYPE/
I                                            3/4"-X42D CONTAINMENT                           CONTAINMENT                                                                                                                                                                                                                                                                                             I t                                                                                                                                                                                                                                                                                                                                                                                      10 PATH TRANSFER UNIT                                                            t                                                   DESIGN CLASS
: 7. ALL PIPING OA TYPE III UNLESS G         TO CONTAINMENT SUMP "A" CONT. SEE NF-39248 10 PATH TRANSFER UNIT                                                                                                                                                                                                                                                                                                                                       TO     CONTAINMENT FOR CONT.SEE NF-39248 SUMP 'A"                                OTHER WISE NOTED
                                                                                                                                                                                                                                                                                                                                                                                                               ,{,' TUBING DRAIN                                                                                                            8. 'W' DENOTES FURNISHED BY WESTING-
_   OUTSIDE REACTOR                   INSIDE REACTOR_                                                                                                                                                                                     HOUSE CORP,
                                                                                                             'lfi"  TUBING DRAIN                                                                                                                                                                                 CONTAINMENT                       CONTAINMENT 9,        FOR VALVE POSITIONS SEE OPS
                                                                                                           /(3/8"-WL-329)                                                                                                                                                                                                                                                                                 /(3/8-2WL-56)                                                                                                                               MANUAL C PROCEDURE CHECKLIST.
I          /           SUMP C 10,         FOR SYMBOLS SEE XH-1-105, NF-39214, L_I___J'                                                                                              11. C2 BOUNDARIES END AT CNTMT PENT.
REF NF-38398-2 IU-1) NF-38398-8 IU-2),
THIS DIAGRAM REPLACES WESTINGHOUSE DWG.NO. 110E067 SHJ REV.11                                                                                                                                                                        Thio map I dcoum<nl io a lllOI fo !ll'aBI omplO)'Oee i11"EI perlorr!lll'IC8 of1hoir j<CB. 'frur peraonol snty ia providod for by .,.;~ oalety prat:tic<lo, i:r,,cedcsos an;I equipmart os dis;ribed in oolety l'aini~ 1J1'0113ffl0, mor1.1olo an;I SPAR'**
llWN FJH       DATE 09-12-14              SIGNIFICAITT NO                         8630                                        l& 2      M430 9010              8400 EC-21790 REV. 1 WASTE DISPOSAL SYSTEM PROJE<;TNO.
APP'O&CEFIT.
H                                                                                                                                                                                                                                                                                                                                                                                                            REFERENCE DRAWINGS                                                                                                                           FLOW DIAGRAM                                                                        H
                                                                                                                                                                                                                                                                                                                                                                                                             !. LEGEND 1110E15HX-HIAW-1-!05)
: 2. LINE LIST (206C92BHX-HIAW-1-786l 3.PHYSICAL NF-39328-2, NF-39325-2                                                   NORTHERN STATES POWER COMPANY                                                                                             83
                                                                                                                                                                                                                                                                                                                                                                                                                   & NF-39309-2                                                                          rJ   X<olEne,gy'
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              $C'J.E      NTS                       REV PRAIRIE ISLAND NUCLEAR GENERATING PLANT AEOWINIJ, MINNEBOTA X-HIAW-1-123 XH-1-123.0GNi 115P GfNFRATIQH CAD j 1                                                 2                                                     3                                                        4                                     5                                       6                                  7                                               8                                                       9                                                 10                                                                                                                                                      12                             FIGURE 9.1-1            REV. 34 CAD FILE: U0910LDGN

1                                                                                                                      2                                                                                                                 3                                                                                                     4                                                                                                                     5                                                                                                                6                                                           1*                                                                 7                                                                                                                     8                                                                                                          9                                                                                                                10                                                                                                                                    11                                                                                           12 REVISIONS 2&sect;.j    AS BUil T -
CORRECTED PIPING LAYOUT
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                & ADDEO CONTINUATION OWG A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               REF, ND.'s PER EC-14472.
OWN1 LAB 3-12-10 A
CHK'D: JMC 4-2 1Hl1l 1NSl0&#xa3; C:ON.TA.IN.M&#xa3; Nl" VE'3":>EI...                                                                                               O U TSIDE:. C ONT i:::.11>.1ME.r,.n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         ouT s 10,                         coN T 1'1Ni'\~N                                r vH,">E L                                      ltJ S IDE                          CON TP...INM~N7" - VES5E I_                                                                                                                                                      AS BUil l-
                                                                                                          ? "13--
UN lT 11 1                                                                                                                             V ~ S SE.L.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            CDRRECTEO LEVEL ALARM Fl f,a..,t,l. COIL.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              1                                                             FA.t-J COIL
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            '\JN\"T                                                                                                                                             ID NO. FOR LA-16812.
l)N I T I                                                                                                                                                                                                                      PER ORR Pl-1119-105 F(EAC, HEAD
              *v'ENT            TO                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     REACTOR HEAO                             OWN1 LAB 3-12-10
               /. TM DRAIN                                                                                                                                   NIA.NIP UL ,*,;T OR                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             VENT TO
                                                                                                                                                      ---y-y-l'\P-.N\ P iJ l,JI-..\OR.                                                                                                                                                                                         CHK'O: JMC 4-2q-10
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          -.-_ ----------- - ----- ---Lr                                                                    !._ _"'_"'
OECONTAM tNAT                                                                                     ( Rl',,N( AAlL.S                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Of.CONTAMINATION                                                        ATM DRAIN
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              -l~                                 ()
_ _N.              F"I.. . . &#xa3;L_.___ r                  __s__"-__-_o_*-                         - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - ---;,C S ~ 6 ~ 2 " C                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 MOD*; EC-tl687 Ill           0)             Ill                              PJT
                                                                                                                                                                                                                                                                                                                    - - -- - -                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                CRAN~ AAll5
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        ~                                                                     ---~',".,,'.",~--.mr--
T
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           " ,<     ' --           ,'~',---                                                                                   (1) __:_                                                  _                   f:111"                                                                              APP'O= CMR 4-29-1111
    - - , ,---,-,. ,- -" - - -''-- . . / ' -                                                                    i             --            -
2'.2J I                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   &#xb5;                                                                                                                                                                1---*-,*L-.:,-.........,.,,.
AS BUILT-T 4""
J                                                                                                                                                                                                                             -
4"                                                                                                  4"      1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   5 WL-5f-30l                                                                                                                                                                                                                                                                                                                           ;::-
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          \
REVISED LINE NUMBERS I11:t                                                                                                                                                               ~~--J~-~*---*.~, - --n t----~.,_-4-WL-.367                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           MI\INS'TEAM RELIEF                                                               "                                                                                                                            ~    r                                                                                                                                                   ~                                                                      *-                       l*WL-18 TO t-WL-12,
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         !J I
4-WL-368 r*
:2 4-2WL-72\                                                                                         "'....___ 4*2WL-71 1--,,r.--...:*~----------~----..                                                                                                                  ~*~---..I                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   2 *C.WL*e.a--                                                 ~D R.ORN=>. 2C.S~
N,=-a.,3,.,-s
:                                                                                                                                                                                                                                                                                                                                                                                                         3-WL-83 TO 3-WL-85 &
                         ~
                                                                                                                                                                                                                                                        *                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              ------- sEE
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 ~ ,-.~ ~-- ~---&#xa3;~T                                                                                                                            -,. ~ ...
LOCATION OF 3-WL-544
* t--.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  --- -,                   oc*                                                                                                                                                                                                                                                                                                                                                                                                                                          ADDEO LN NOS.3-WL-41114 &
                                                                                                                                                            !                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    * -'-r-=--r---<J-~:l--r 2-WL-J67                                            ~-
:        4"_.                _\ 2" _             w_J::J,,;---_--.-.-,                                                4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              TOTURBINE BLDC1. SUMP 1
3-2WL-404.SAFETY CLASS UNI T 2.                                                                                                                                       \                 '-- !1i   "*2WL- 8t                                                                                                                                                                                                                                                                                                                                                           FLAGS AT PENET 26 UNIT 1 B                                         i.. Y,, . \,                                                           ,. j ,*..,.                                                 -@'                                                        **                                                                                                                                                                                                                                                                                                                                                                     1/* "' F~OM
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        ..                                                                  ...                                                                                                                                                                                                                                                                                         B
: 8. UNIT 2,SAFETY CLASS
                                    ~4"                                        ~                                                                             I                                                                                        4"             4 *'                                                                                                                                                                                                                                                                                                                                                                                                                                                        21 S~DR NSC-9>7~ 1S D"w<:,. _._                                                                                  _ _ __.''                                         *                                  -j2WL-S7*281                                                  '                 , ..             ,..
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            @~                                                                                                                                                                  .
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               ? E..A. '- ~ T EI<! 'P 1..._:e. R                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                LEGEND & NOTES & lB TO J                                               C:::,
: r. 2--
4-WL-369 J
                                                                                                                                                             ;         -            easa                                                                                                                                                                                                                                                                                                                                                                                                                        X. l.-.i 1AW 4"
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 ,..                                                                                                                                            ORIGINAL LEGENO.
59 DRNS A*-3 1"HISDW4. --:* -------1 10.::>l-                ~
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           '                          L 2 -~,~ 20                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             WL-155-631                                                          ,          '--- 3/44-~L-l&S L----+---;::::e'~,:-~<l-oi""                                                                 \",.--..[                                                                                  * . l'NL-38-211
                                                                                                                                                                                                                                                                                   ~-~~-                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             CONTROL VAL VE SYMBOL
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                                                                                                                              ~.'.""wL-19~                                            .1/2"x 3/4i"cTYP.)                                   lwL*&!h*GI                       i--.2                                                                                                                                                                                                                                                                                                                                    (u1~                                                                                                                                                                  I.,_                                                                                                                                                                                                               FOR CONTI NVAT10N 5'/5TEM
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LP..UNDRY'~HO"T SH0\IJ&#xa3;R. TAN\o:.... p1J1v1p1F12:2_                                                                                                                                                                                                                                                                                                     :>/41                                   3/4" SA.Mr'LE.                                                                                                                                                                                                                        TO      >-lO'-l-AERJ'\"fEO                                                                                     ,..__ _                        2,-WL-72                                                                                                    SEE OWG NF*o'>2 ...e                                                                                     PER ORR PI-00-185
                                                                                                                                                                                                                                                                                                                                                                                                                                        ....'\_~:J<:-,**',/-CLC:.<li.,-,r-*!1-,-"--*.c_oNN-L I                                                                           Of.2.D, -!e:Pv\Jc;., "-10, x.-i.-:i.1Aw-:;n~*6                                                         2-WL-35 ___. /                      \ 0 'R..hD\A..,\\ON MON\\OR.                                                                                                                                                                                                                                                                                                                                                                                                                                      5t.lM>'            "fA>-lK OWN: VLS 03121/05 C                                                    ..                   1.,e,_0"-1.0<'<.'( !<- 'MO,                                                            (Tli/3)            I                                                                                 , w                D"" Ol':,C.1-\"'R"'-"'-                                                                                                                                                                                       ~IWL-52-*      I                                                                                                   '                                                      NON AE.RATEO
(_TO ~Qlll.PME.~T DRA.\IJ)
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11 78         11 TO UN_ IT l C.CMPo5iTE~~2-WL-S52:
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11 ,J--.
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LAND-LOCKED                                            ,     , 1 I''-_,,, _..,,v                                                                Mo- 11 -*              :,                          TUA.E>INe                                                                                                           i B~A~iA~~2~gNr.                                        r--i         ~       /                    * --2--WL-S'a*                                                        ,                           BLDG,                      SUMP                                                                                     i so 9                        I                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      OWN: LAB CHK'D: JMC 3-12-10 4-29-lli!I
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1
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CORRECTED LOCATION OF CATEGORY, I VENT ZONE,
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                                                                                                                                                                                                                                                                                                                                                            ' ~                    &#xa5;4'      VE .,i'T                      ;                                                                                                                                                 BD-10-3                                                                                                                                                                        \\        f=-t'O AbT                CO\.J_l:;;C,"l"\ON Pc~--.:.---1 L I SU , 9                                            ;L*o,,-~71 c:c    Ill-                                                   ..L
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* MOD"1 EC-11687 APP' *:   CMR 4-29-10
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* WL-155-63 &. 54 Cl LOCATION C-8.
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CONT                                                                                                         Y-WL                                    ~CONTROL                                                            SD*I1/4-7
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33 AERATED ORAI\..J':>
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* 10 ---13 41~                 _./u",y*                                  -<Ji><J----<t-...1        I: WL 66 5 I                     FROM WASTE EVAPORATOR7
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7 i
PACL. SEE NF-39248
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__J I                    2-WL-75                                                                                      F!LTEd 80---1211'                                        /..                   A.ERATEO CRAINS                                                                                                                                                                              LAUNDRY & HOT SHOWER 31),                                        PI M.ONiroR TANK                                                                                                                                                                                                                                                  *
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1 60 _13 _38 1
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SV- 33487
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1/2'(TII/
1
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1             ,:...3/4-wL-315                        ~3/4                                                                  \                        ,_                        1           ...         (sv- 334861                                                                                                Ol3          )isa, 10                  "W"; 1 1
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111164
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sv-33489 cv
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ON LO LEVEL 3l-WL-162 I ~1-WL-37                                                                       I
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(*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    8"AUX.BL G.STAN 0v      *               *            (2-sa-1s                                 II                                                     7             "W"               lwL 31---33 f_____....1---wL---158                                           2 -x 42 "W".1  *                                      ~                                                                 '"--....'._
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