ML20090A806

Proposed Tech Specs Re Dc Power Sys

ML20090A806
Person / Time
Site:	Cooper
Issue date:	02/25/1992
From:	NEBRASKA PUBLIC POWER DISTRICT
To:
Shared Package
ML20090A789	List: ML20090A786 ML20090A806
References
NUDOCS 9203030104
Download: ML20090A806 (12)

Text

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TABLE OF CONTENTS (coot'd)-

• Pave No.

$URVEILIANCE LIMITING CONDITIONS FOR OPERATION. REOUIRE_MENTS I

4,5 114'- 131 3.5 CORE AND CONTAINMENT COOLING SYSTEMS Core Spray and LPCI Subsystems A 114 A.

B. _ Containment Cooling Subsystem (RHR Service Water) B 116- '

C 117 C. HPCI Subsystem D 118 D. RCIC Subsystem-E 119

E. Automatic Depressurization System .

F. Minimum Low Pressure Cooling System Diesel

• Generator Availability F 120 Maintenance of Filled Discharge Pipe G 122 G.

H 123 H. EnBi neered Safeguards Compartments Cooling 1

-3.6 PRDIARY SYSTEM BOUNDARY 4,6 132 --158 A 132 A. Thermal and Pressurization Limitations B 133a B. Coolant Chemistry Coolant Leakage C 135- 1 C. i D 136 D. Safety and Relief Valves 137 E

E. Jet Pumps _

F. ~ Recirculation Pump Flow Mismatch F 137 Inservice Inspection G 137 G.

Shock Suppressors (Snubbers) H 137a H.

3.7 CONTAINMENT SYSTEMS 4.7 159 184' A 159 A, Primary Containment B 165 B. Standby Gas Treatment System Secondary Containment C 165a C. _

166 D. Primary Containment Isolation Valves D 3.8- ' MISCELLANEOUS RAD 10ACT!"E MATERIAL SOURCES 4.8 185-- 190 4,9 191 - 202~

3.9 AUXILIARY ELECTRICAL SYSTEMS Auxiliary Electrical Equipment A 191 A. 192 B

B. Operation with Inoperable Equipment 4,10 203 - 209

3 410 -CORE ALTERATIONS -

A- 203 A. . Refueling Interlocks 205 Core Monitoring B B.

C .205 C. Spent Fuel Pool Water Level 206-D. ; Time Limitation D 206 E. Spent Fuel Cask Handling _E 4,11 210 - 214e-i 11' FUEL RODS-Average Planar Linear Heat Generation Rate (APLHCR) A 210-A.

B 210 B. Linear Heat Generation Rate (LHGR) 212 C. Minimum Critical Power, Ratio (MCPR) C

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" INTENTIONALLY LEFT BLANK"

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- LIMITING CONDITIONS FOR OPERATI0tl-SUR_VEILLANCE RE0UIREMENTS 4

3.9 -AUXILIARY ELECTRICAL SYSTEM '4.9 AUXILIARY ELECTRICAL SYSTEM Anolicability:

Anolicability:

Applies to the auxiliary electrical . Applies to the periodic tiesting power system. requirements of the auxiliary electrical systems, Obiective: Obiective:

c To assure an adequate supply of -Verify the operability of the electrical power for operation of auxiliary electrical system.

those systems required for safety.

Scecification: S.pec i fic a tion:

A. 6uxiliary Electrical Ecuineent A. Auxiliarv Eleerrical Ecuinment The reactor shall not be made 1. Emercency Buses Undervoltare Reinvs 1.

critical from a Cold Shutdown Condition unless all of the a. Loss of voltage relays following conditions _are satisfied:

Once every 18 months, loss of

a. Both of f-site sources (345 KV and vol.tage on emergency buses is 69 KV) and the startup transformer simulated to demonstrate the

-and~ emergency transformer are load shedding from emergency available and capable of buses and the automatic start automatically supplying power to the of diesel generators.

4160 Volt emergency buses IF and 1G.

b. Undervoltage relays

b. Both diesel generators- shall be low opetable and there -shall be a Once every 18 months.

minimu:; of 45,000 gal. of diesel voltage on emergency buses is fuel in che fuel oil storage tanks, simulated to demonstrate disconnection of the emergency buses _ from the offsite power

-c. The 4160V critical buses IF and 1G unde rvo lta ge and' the 480V critical buses IF and source. The 1G ar energized. relays shall be calibrated once every 18 months.

1. The loss of voltage relays and their auxiliary relays are operable.

2. The undervoltage relays _ and their auxiliary relays are operable,

,d. The four unit 125V/250V batteries and their chargers shall be operable.

e. The power monitoring system for the inservice . RPS MC set or alternate source shall be operable.

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_ SURVEILLANCE REOUIR[MS L kMITING JONDITIONS FOR' OPERATION i

3',9,B 4.9,A (cont'di)

- B, Oneration with Inocerable~ Eautoment ,

Whenever the reactor is. in Run Mode or Startup Mode with the reactor not .,

in _a.

.-Cold' Condition, the availability of electric power shall be as specified in 3.9,A.l. except as specified in 3.9,B.l. ,

_ l. Incomine Power a, From and af ter - the '. date incoming- ,

. power is not available from a ,

startup or . emergency transformer, continued- reactor operation is permissible under this condition for  ;

seven days. At the end of this '

period, provided the second source of incoming power has not been made immediately available, the NRC must be notified of the event and the

_ plan to restore this second source.

During thiJ period, - the two diesel generators and associoted critical ,

- buses must be demonstrated to be

, operable,

b. From and after the date that '

incoming power is-not available from both- ' start-up and emergency both failed),  ;

transformers (i.e,,

continued operation 1s permissible, provided the two diesel generators and associated critical buses are-demonst.ated to.. be operable, all core and containment cooling systems are operable, reactor power _ level is reduced to 25% of the-rated and NRC is notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the situation, the precautions to be taken during this period ~ and the plans for _ prompt . restoration. of incoming power. ,

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1$1MITING1 CONDITIONS FOR OPERATION SURVEILLANCE REOUIREMENTS' 3.9iB- (cont'd.) 4,9. A - (cont' d)

2. Diesel Generators- 2, . Diesel Generators-

a. From and af ter the date that one of a. Each diesel generator-shall be

-the_ diesel generators or an started manually and loaded to 1 associated critical. bus is made or not less than 50% of rated found to be' incperable for any load for no less than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> '

reason, continued reactor operation once each month to demonstrate is permissible in accordance with operational readiness.

Specification 3.5.F.1 if  :

Specification 3.9. A.1 is satisfied. During the monthly generator  ;

test the diesel generator >

b. From and af ter the date that both starting air compressor-shall diesel generators are made or found be checked for operation and to _ be inoperable for any reason. -its ability to recharge air continued- reactor operation is receivers. The operation .of permissible- only during the the diesel fuel oil transfer-succeeding 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> in accordance pumps and fuel oil day tank-with Specification _3.5.F 2 if level switches shall be-

• Specification 3.9, A.1 is satisfied. demonstrated, and the diesel starting time to resh rated

c. From and af ter the date that one 'of voltage and frequency sha h .3e the diesel generators or associated logged. .

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critical buses and either the-emergency or - startup transformer b. Once every 18 months tne power source are made or found to be condition 'under which. the inoperable for any reason, continued diesel generator is required reactor operation is permissible in will be simulated and a : test ,

accordance with Specification conducted to demonstrate that-

3. 5.F.1, provided the other off site it will start and accept the source, startup transformer or emergency Load- within the emergency ' transformer is available specified time sequence. The and. capable. of automatically results shall be logged. .

supplying power. to the 4160V c. Specification 4.9.A.2.c critical -buses and the NRC- is d*I*'*d' notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the

! occurrence and the plans for d. Once a month the' quantity of-restoration _of the inoperable diesel fuel available shal'1 be components. logged.

e. .Every three months and .upon delivery a sample of diesel fuel shall- be checked- for quality. The quality shall be within - the acceptable - limits specified in Table 1 of ASTM D975-68 for Nos. ID or 2D-and logged.

f. At least once per 18 months, during shu t_down , each diesel generator . shall be given an inspection in-accordance with instructions based on the-manu fa c tu re r s recommendations.

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LIM 5TINGCONDITIONSFOROPERATION SURVEILLANCE REOUIREMDlLS

. 3.9.B. (cont'd.) 4.9.A (cont' d. )

3. DC Power 3 .- pfq 'pwn, g

a. Every week, the following parameters

a. From and after the date that one of shall be verified:

the four unit 125 volt or 250 volt batteries is made' or found to - be 1. -The- parameters .of each_

inoperable for any reason, restore designated pilot cell meet the.

the . inoperable battery to OPERABLE Category A limits in .

status within' 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at Table 3.9.1. I least HOT SHUTDOW! within the next 2. The' total terminal voltage for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within each 125-volt battery . is the followir.g 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. . greater than or equal to 125 volts on float charge, and >

for each 250 volt _ battery the terminal voltage. is greater than or equal to 250 volts on .

float charge.

b. Every ' quarter, and within 7 days alter a battery discharge causing battery terminal voltage below 105 volts for a 125 volt battery or 210 volts for a 250 volt battery, or battery overcharge with battery terminal voltage above 140 volts for i

. a 125-volt battery or 280 volts for a 250 volt battery, by verifying that:

1. 'The parameters. .for call-to-cell' meet the Category B limits in Table 3.9.1.

2. There is no abnormal corrosion at either te rminal or connectors- which could affect connection resistance, or the..

connection resistance of these icems is- less than or equal to 15 0 x 10 ohm . ..

3. The electrolyte- temperatures in a representative sample - of cells, consisting of at least every sixth . cell. are within 5'F.

c. Once each operating cycle:

1. The cells, cell _ plares,. and-battery rac k.s . shall be l visually inspected.

2. The - cell- to-cell . and terminal connections shall be verified to be clean, tight, and free of corrosion.

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. -- LfMITINGCONDITIONS'FOROPERATION SURVEILLANCE REOUIREMENTS 3.9.B.3 (cont'd.) 4.9.A,3 (cont'd.)

b, From andafter the date that'a unit 3. The resistance' of -each battery charger is made or found to cell-to cell and terminst be inoperable, restore the - connection - shall. be verified  ;

inoperable battery charger to to be less than or equal to ,

OPERABLE status or replace with the 150 x 10'_' _ ohm ,

spare 'oattery charger within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or be in at least HOT SHUTDOWN 4. . Each 125 volt battery charger within the 'next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in Coi.D will supply 200 ampere: at-SHUTDOWN within' the following- 125 volts for at least- ,

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, and each 250 volt

• attery charger will supply- ,

200 amperes at_ 250 volts for -

at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, d, Once each operating cycle , during shutdown, one of _the following tests will be performed: r

1. A -battery setvice test to verify that battery capacity is adequate to supply the  ;

emergency load profile. .

2. A performance discharge test, in lieu of the above service test, once overy five years to verify that battery capacity is at least 85% of the manufacturer's rating.

3. A performance discharge test, in lieu .-of the above set,1ce test, when the ba tte ry shou;

. signs of degradation or has been in service seventeen years or longer.

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. LkMITINGCONDITIONS-FOR' OPERATION ~ SURVEILIANCE ' REQUIREMENTS

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3.9.B (cont'd.) 4.9.A (cont'd.)

4 Power Monitorine System for RPS 4. _ Power Monitorine -System for' RPS Systqm. System _

a. With one RPS electric. power The -above specified RPS power

. monitoring c5 annel for an inservice . monitoring system instrumentation RPS MG set or alternate power supply shall be determined operable; inoperable, restore the inoperable channel to operable status within a. At least once' per operating

'72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or remove che associated cycle by demonstrating the

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RPS MG set or alternate power supply ope _rability of over-voltage, from service, undar vo1.tage and under frequency protective

n. b. k'ith: both RPS electric power '

instrumentation by performance s monitoring channels for an inservice -of a _ channel calibration RPS MG set or alternate power supply including simulated- automatic inoperable, restore at least one to actuation of the protective operable status within 30 minutes or relays, tripping logic and remove the associated RPS MG set or output circuit breakers and alternate power supply from service. verifying- the following set point.s .

1. Over voltage s 132 VAC. with.

time delay 5 2 sec.

2. .Under-voltage z.108 VAC, with time-delay _s ? see.

3, Under-frequency- 2 57 H::. with ,

l time delay 5 2 sec.

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TABLE 3.9.1 i

BATTERY SURVEILLANCE REQUIREMENTS 1

CATEGORY A* CATEGORY BA (WEEKLY) (OUARTERLY) l Parameter Limits for each Limits for each Allowable

• value for designated pilot cell connected cell each connected cell Electrolyte 2 Minimum level 2 Minimum level .

Above top of plates, Level indication mark, and indication mark, and and not overflowing ,

s %" above s %" above maximum level maximum level indication mark indication mark Float Voltage 2 2.13 volts 2 2.13 volts!" 2 2.10 volts Not more than 0.020 below the average of all connected cells Specific Gravity

• 21.195* 2 1.190 Average of all Average of all- connected cells connected cells-  % 1.190*

^ 2 1.200

• For any Category A parameter (s) outside the limit (s) shown, the battery may be considered OPERABLE ,

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provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> all the Category 8 measurements are taken and found to be within tneir allowable values, and provided all Category A and B parameter (s) are restored to within limite within tha next 6 days.

• For any Category 8 parameter (s) outside the limit (s) shown, the battery may be considered OPERABLE l

provided that the Category B parameters are within their allowable values and provided that Category B parameter (s) are restored to within limits within 7 days.

l P Any Category B parameter not within its allowable value indicates an inoperable battery.

• May be corrected for average electrolyte temperature.

• Corrected for electrolyte temperature and level.

• Or battery charger current is less than 2 amperes when on float charge.

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3.9 f.ASES The general objective of- this Specificacion is to assure an adequate source of electrical power to operate the auxiliaries during plant operation, - to operate

. facilities to cool and lubricate the plant during shutdown and to operate the-engineered safeguards following the accident. There are three sources of ac electrical energy available; namely. the startup transformer, the emergency transformer and two diesel generators. The de supply is required for switch gear and engineered safety feature systems. This supply consists of two 125V DC and two 250V DC batteries and their related chargers. Specification 3.9.A states the required availability of ac and de power; i.e., active off-site ac sources and the required amount of on site ac and de sources.

Auxiliary power for CNS is supplied from the startup transformer and the normal transformer. Both of these transformers are sized to carry 1007, of the station auxiliary load. The emergency transformer is about one tLird the size af these two -

transformers and is equal in site to both emergency diesel generators.

The startup transformer and the emergency transformers are the offsite power sources.

Their voltage is monitored by undervoltage relays which provide low voltage protection for the- emergency buses. Whenever the voltage setpoint and time delay limit for the undervoltage relays have been exceeded, the emergency beses are automatically disconnected from the offsite power source.

If the startup or emergency transformer is lost. the unit can continue to operate since the unit auxiliary transformer is in service, and the emergency or startup transformer and the diesels are available.

If both the starcup and emergency transformers become inoperable, the power level-must be reduced to a value where by the unit can safely reject the load and continue to supply auxiliary electric power to the station.

In the normal mode of operation, the startup and emergency transformers are energized and two diesel generators are operable. One diesel generator may be allowed out of service based on the availability of power from the startup transformer and the f act ~

that one diesel generator carries suf ficient engineered safeguards equipment to cover

-all breakers. With the startup transformer and one dtesel generator out of service, the off site transmission line correspondin5 to the emergency transformer must be available. Upon the loss of one on-site and one off-site power source, power would be available from the other immediate of f-site power source and the two operable on-site diesels to carry suf ficient engineered safeguards equipment to cover all breaks.

In addition to these two power sources, removal of-the Isolated phase Bus " quick" disconnect links would allow backfeed of power through the main transformer to the unit auxiliary transformer and provide power to carry the full station auxiliary--

load. The time required to perform this operation is comparable to the time the reactor could remain on RCIC operation before controlled depressurization.need be initiated.

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~ 3,9_ BASES (cont'd) l l

The L D.: C. Power Systems allowable out of service time is - _ based on NRC Regulatory Guide 1,93, " Availability of Electrical Power Sources." The two hour limit to >

restore battery . operability minimiten- reactor operation. while .in a degraded condition.

.4.9 BASES The monthly test of the diesel generator is conducted to check for equipment failures arv' leterioration. Testing is conducted up to equilibrium operating conditions to l dem. istrate proper operasion at these conditions. The diesel generator will be ' .

manually started, synchronited and connected to the bus and load picked up. The  !

diesel generator should be loaded to at least 50% of rated load to pre"ent fouling of the engine, It is expected that the diesel generator will be run for at least two-hours. Diesel generator experience at other generating stations indicates that the

- testing frequency is adequate end provides a high reliability of operation should the i system be required.  :

Each diesel generator has two air compressors and two air receivers for starting. ,

It - is expected that the air compressors will run only infrequet.cly. During the monthly check of the diesel generator, each receiver in each set of receivers will be drawn down below the point at which the-corresponding compressor automatically ,

4 starts to check operation and the ability of the compressors to recharge the receivers.

The diesel generator fual consumption rate at full-load is approximately 275' gallons per hour. Thus, the monthly load test of the diesel generators will test the-operation and the ability of the fuel oil transfer pumps to refill' the day tank and will check the operacion of these pumps from the emergency source.

The test of the diesel generator during the refueling outage will be more comprehensive in that it will functionally test the system; i.e, it will check diesel generator starting and closure of diesel generatar breaker and sequencing of load on the diesel generator. The diesel generator will be started by simulation of a loss of coolant accident. In addition, an undervoltage condition will be imposed to simulate-a loss of off-site-power.

Periodic tests between refueling-outages verify the ability:of the--diesel generator

- to run at full load and the core and containment cooling pumps to deliver full flow.

Periodic testing of the various components, plus a functional test once a-cycle, . is sufficient to maintain adequate reliability.

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The diesel fuel oil quality must be checked to ensure proper operation of the diesel generators. Water content should be minimized because water in the fuel could

contribute to excessive damage to the diesel engine.

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4,9 L M n (cont'd)

Vben it is determined that some auxiliary electrical equipment is out of service ,

the increased surveillance required in Section 4.5.F is deemed adequate to provide assurance that the remaining equipment will be operable.

The surveillance requirements for demonstrating tho OPF.RABILITY of the unit batteries are in accordance with the recommendations of NRC Regulatory Guide 1.129,

" Maintenance Testing and Replacement of - Large Lead Storage Batteries for Nuclear Power Plants, dated February 1978 and IEEE Std 450 1987, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations."

Once each operating cycle, during shutdown, either a service test or performance discharge is performed on the 125 V and the 250 V batteries. Th. performance discharge test is performed in tieu of the service test when a battery shows signs of degradation. Degradation is indicated when battery capacity drops more than 10%

of rated capacity from its average on previous performance tedts, or is betow 85% of the manufacturer's rating.

Replacement criteria for 125V and 250V station batteries is $S5% capacity factar and the maximum rime for replacement should be one (1) year. This will assure that the remaining battery capacity is adequate to meet load requirements, Verifying average electrolyte ten.perature above the minimum for which the battery was sized, total battery terminal voltage on float charge, connection resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability of the battery to handle high discharge rates and compares the battery capacity at that time with the rated capacity.

Table 3.9.1 specifies the normal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage and specific gravity. The limits for the designated pilot cells ensure that their float voltage and specific gravity are characteristic of a charged cell with adequate capacity, and ensures the OPERASILITY and capability of the battery.

1 Operation with a battery cellts parame:er outside the normal limit but within the allowable value specified in Table 3,9.1 is permitted for up to 7 days. During this 7-day period: (1) the allouable values for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (2) the allowable value for the average specific gravity of all the cells , not more than 0.020 below the manufacturer's recommended full charge specific gravity, ensures that the decrease in rating will be less than the safety margin provided in sining; (3) the allowable value for an individnal cell's specific gracity ensures that an individual cell's specific gravity will not be more than 0.020 below the average specific gravity of all connected cells and that the overall capabitity of the battery will be maintained within an acceptable limit; and (4) the allowaole value for an individual cell's float voltage, greater than 2.10 volts, ensures the l battery's capability to perform its design function.

The Reactor Protection System (RPS) is equipped with a seismically qualified, Class lE power monitoring system. This system consista of eight Electrical Protection Assemblies (EPA) which isolato the power sources from the RPS if the input voltage and frequency are not within limits specified for safe system operation.

Isolation of RPS power causes that RPS division to fail safe.

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