RC-18-0080, Virgil C. Summer Nuclear Station, Unit 1, Updated Final Safety Analysis Report, Chapter 10.0, Steam and Power Conversion System
Text
10.1-1 Reformatted Per Amendment 00-01 10.0 STEAM AND POWER CONVERSION SYSTEM 10.1
SUMMARY
DESCRIPTION The steam and power conversi on system is shown schematic ally by Figure 10.1-1, Sheets 1 and 2. Principal design and performanc e characteristics are given in detail in Section 10.4. The heat balance guaranteed by the turbine manufacturer is shown by Figure 10.1-2. Figure 10.1-3 shows the maximum calculated turbine power (stretch power) heat balance.
The steam and power conversion system includes the following:
- 1. Main Steam System.
- 2. Turbine Generator.
- 3. Condensate System.
- 4. Condenser Air Removal System.
- 5. Feedwater System.
- 6. Turbine Bypass System.
- 8. Steam Generator Blowdown System.
The thermal energy of steam generated by a 3 loop, Pressurized Water Reactor Nuclear Steam Supply System (NSSS) is converted to electrical energy through a tandem compound, 1800 rpm turbine generator.
Steam is produced in 3 steam generators where heat is tran sferred from the reactor coolant system to the feedwat er. This steam flows from each steam generator to a distribution header. From this distribution header, 4 main steam lines convey the steam to a double flow, high pressure turbine. Steam exiting the high pressure turbine normally passes through 2 moisture separator r eheaters prior to entering 2, double flow, low pressure turbines. Steam exits from the low pressure turbines to the main condenser. The high and low pressure turbines are equipped with a total of 6 extraction points which provide steam for feedwater heating. Moistu re separator drains, steam reheater drains and high pressure heater dr ains are returned to a deaerating heater where they become part of the feedwater. Low pressure heater drains and steam packing condenser drains are cascaded to the main condenser.
00-01 RN 02-022 RN 02-022 10.1-2 Reformatted Per Amendment 00-01 Steam exhausted from the lo w pressure turbines is condensed and deaerated in a 2 shell surface condenser. Condensate is collected in a hotwell sized for a holding
capacity of approximately 2 minutes at maximum condensate pump flow. Condensate is normally pumped from the hotwell by 2 of the 3 condensate pumps. The condensate passes through the steam packing condenser and 3 stages of low pressure heaters to the deaerating heater and deaerator storage tank. Each of the 3 stages of low pressure heaters is comprised of 2 para llel 50 percent capacity trains.
The feedwater booster pumps take sucti on from the deaerator storage tank and discharge to the feedwater pump suction. The feedw ater pumps discharge to 2 trains of high pressure heaters. Feedwater exiting these heaters passes into a single header from which it is distributed to the feedwater flow control valves. The feedwater flows from the feedwater flow control valves through the containment isolation valves into the steam generators.
The Emergency Feedwater System provides an additional means for the supply of feedwater to the steam generator s for use when the Feedwater S ystem is not available.
This permits continued transfer of reactor coolant thermal energy to feedwater in the steam generators. The Emergency Feedwater System c onsists of 2 electric motor driven and 1 turbine driven emergency f eedwater pumps. These pumps, when required, provide feedwater to the steam ge nerators from a reserve supply maintained in the condensate storage tank.
A backup source of water is provided by connection to the Service Water System.
Noncondensible gases removed from the co ndenser by the Condenser Air Removal System are monitored for radioactivity. T he condenser offgas is normally discharged to the Auxiliary Building Exhaust Sy stem charcoal filt ers. Provision is made for discharge of the noncondensibles to atmosphere.
Should a 100 percent loss of turbine load occur, reactor coolant thermal energy is dissipated through the formation of steam in the steam generators and subsequent bypassing of the steam to the condenser an d/or the atmosphere through the Turbine Bypass System and through the power operated relief valves.
02-01 00-01 RN 02-022 10.1-3 Reformatted Per Amendment 00-01 The following portions of t he steam and power conversion system are safety-related:
- 1. Main Steam System piping inside the Reactor Building. 2. The portion of the Main Steam System which forms a part of the containment boundary, including main steam safety va lves, power operated relief valves, and main and branch steam isolation valves. 3. The main steam piping to the emergency feedwater pump turbine.
- 4. The Emergency Feedwater System. 5. Feedwater System piping from the feedwat er containment isolation valves to the steam generators. 6. Steam generator blowdown piping from the steam generator to and including the containment isolation valves.
10.1-4
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RN 05-043 10.3-1 Reformatted Per Amendment 02-01 10.3 MAIN STEAM SUPPLY SYSTEM The Main Steam Supply System conveys main steam from the steam generators to the turbine generator and, through branch lines, to the following: feedwater pump drive turbines, emergency feedwater pump drive turbine, moisture separator reheaters, auxiliary steam system, deaerating feedwater heater, and steam dumps to the condenser and atmosphere.
10.3.1 DESIGN BASES 10.3.1.1 Codes and Standards The Main Steam Supply System is designed in conformance with the following codes and standards:
- 1. Steam generator secondary sides, pi ping and valves, between the steam generators and main steam isolation valves , including the main steam isolation valves, main steam safety valves, and power relief valves, are classified as Safety Class 2a and are designed in accordance with the ASME Code,Section III, Class 2.
- 2. Steam piping and components in the lines to the emergency feedwater pump drive turbine are classified as Safety Class 2b and are designed in accordance with the ASME Code,Section III, Class 3.
The emergency feedwater pump drive turbine exhaust piping is classified as safety class 2b and is designed in accordance with the ASME Code,Section III, Class 3 except for hydrotesti ng and code stamping.
- 3. Main steam piping in the Intermediate Building between the ma in steam isolation valves and the Turbine Building wall is non-nu clear safety class. However, this piping excluding branch lines, satisfies the requirements except for stamping, of the ASME Code,Section III, Code Class 2.
This provides great er assurance of design and fabrication integrity, thus, reduc ing risk of postulated pipe rupture in this area. This piping is ident ified as "Note 1" piping on Figures 10.3-1 and 10.3-2.
Originally the main and branch lines we re designated as "Note 1" piping to reduce the number of postulated pipe rupture lo cations by the use of a code stress analysis to choose intermediate breaks. In the final pipe rupture analysis of the branch lines, stress analysis was not used and intermediate breaks were postulated at each fitting (see Section 3.6.
2.5.1). Therefore, it was no longer necessary to provide code piping and the "Note 1" designation for these branch lines was deleted.
- 4. Piping other than t hat noted in 1, 2 and 3, above, is non-nuclear safety class and is designed in accordance with ANSI B31.1
[1].
10.3-2 Reformatted Per Amendment 02-01
\5. Cast steel valves, except those noted in 1, 2 and 3, above, are non-nuclear safety class and are designed in accordance with ANSI B16.5
[2]. 6. Main Steam Supply System drains are designed using "Recommended Practices for the Protection of Water Damage to Steam Turbines Used for Electric Power Generation, Part II,"[3] as a guide.
- 7. The Main Steam Supply System is designed to permit inservice inspection as required by the ASME Code,Section XI.
- 8. The Main Steam Supply System is des igned with the capability to dump steam to the condenser and/or the atmosphere as discussed in Section 10.4.4.
10.3.1.2 Heat Balance The Main Steam Supply System is designed to deliver 11,734,149 lb/hr of steam to the turbine control valves and 1,123,964 lb/hr to t he moisture separator reheater for a total of 12,858,113 lb/hr. (See GE He at balance 170x595-21, Rev. 1).
10.3.1.3 Design Conditions The system is designed to withstand the same conditions as are the steam generator secondary sides. Design pressure is 1185 ps ig; design temperature is 600°F. Design pressures and temperatures for piping, valv es, and pressure retaining components are tabulated on Figures 10.3-1 through 10.3-4.
10.3.1.4 Environm ental Conditions Environmental conditions considered in the design of the Main Steam Supply System are presented in Table 10.3-1.
The emergency and faulted conditions are based on the Main Steam Line Break and Loss of Coolant Accidents. Components withi n the Reactor Building are also subjected to a spray of borated water and sodium hydr oxide as described in Section 6.2.2.2.1.
02-01 02-01 10.3-3 Reformatted Per Amendment 02-01 10.
3.2 DESCRIPTION
10.3.2.1 General The Main Steam Supply System consists of 3 steam generators, 3 flow restrictors, 15 safety valves, 3 steam generator power relief valves, 3 main steam isolation valves, 8 steam dump valves to the condenser, 3 atmospheric steam dump valves and other required valves, steam traps, instrumentation, controls, and associated piping. See Figures 10.3-1 through 10.3-4.
The Main Steam Supply System conveys satu rated steam from the 3 steam generators to the turbine generator.
One (1) line from each of the 3 steam gener ators conveys main steam to a header located in the Intermediate Building. From the header a total of 4 lines proceed to the turbine stop valves. Steam flow to the high pressure turbine is regulated by the turbine control valves.
Moisture separator reheater units are loca ted immediately beside the turbine between the high pressure and low pressure elem ents. Heating tube bundles within each moisture separator reheater, supplied with st eam from the Main Steam Supply System, superheat high pressure turbine exhaust steam approximately 136 F before it enters the low pressure turbine elements.
Main steam is also supplied to the following:
- 1. Feedwater pump drive turbines for startup and runout.
- 2. Auxiliary Steam System for the liquid waste evaporator as required during normal operation and during plant shutdown until the auxiliary boiler is operational.
- 3. Extraction Steam System for pegging and sparging the deaerator.
- 4. Emergency feedwater pum p drive turbine during emergency and normal plant shutdown to supply minimum feedwater requirements.
The Main Steam Supply System was originally designed to follow a full load rejection, defined as a reduction from 100% of rated turb ine generator load to plant auxiliary load, without reactor trip through actuation of the steam dump to the condenser and atmosphere. With the transition to longer fuel cycles and le ss negative moderator temperature coefficients at the beginning of the fuel cycle, a full load rejection can no longer be sustained without a reactor trip for all times in core life and all allowable values of full power, average coolant temper atures within the Reactor Coolant System.
02-01 10.3-4 Reformatted Per Amendment 02-01 Steam dump valves permit unit operation at turbine loads lower than the minimum power setting (15% reactor power) of the Nuclear Steam Supply System (NSSS) automatic control. In addition, the steam dump valves permit reduction of turbine generator load at a rate greater than the 5% per minute maxi mum rate of load reduction for the NSSS.
Steam generator power relief valves provide a means for plant cooldown by controlled steam discharge to the atmosphere should the condenser not be available. These valves pass a total of 18.76% of the rated maximum steam flow (at full load pressure). One (1) valve is provided in each generator li ne, upstream of the main steam isolation valves.
10.3.2.2 Main Steam System Piping Each line from the steam generators is 32 in ch nominal OD, 1.15 inch minimum wall, carbon steel pipe. The piping inside the Reactor and Intermediate Buildings is routed and restrained to minimize the possibility of a single line failure affecting the other piping. In the area wh ere the safety valves are locate d, the pipe OD is increased and the nominal wall thickness is 1.90 inches to provide extra strength. The 3 lines from the steam generators are manifolded into a 32 inch nominal OD, 1.15 inch minimum wall, carbon steel header.
From the header, steam flows through four(4) 30 inch nominal OD, 1.125 inch nominal wall, carbon steel lines to the turbine gener ator. Steam also fl ows from the header through a 24 inch OD, schedule 80, carbon st eel pipe to the moisture separator reheater and feedwater pump drive turbines.
A 4 inch OD, schedule 80, carbon steel pipe supplies steam from each of 2 steam generator main steam lines to the emergen cy feedwater pump drive turbine. Steam from only one steam generat or is needed for pump operation; 2 sources are provided for required redundancy.
Steam generators and flow restrictors are discussed in detail in Section 5.5.
10.3-5 Reformatted Per Amendment 02-01 10.3.2.3 Main Steam Isolation Valves Each of the 3 main steam lines proceedi ng from the steam gener ators to the main steam header is equipped with a quick closing ma in steam isolation valve capable of tight closure, regardless of fl ow direction. The main steam isolation valves are of the articulated poppet, wye type design. These nominal 32 inch valves have a capacity of 4,277,315 lb/hr steam flow with an approx imately 2.26 psi maximum calculated pressure drop across the fully open valve. These valves are designed for 1284 psig at 600 F. The valves are actuated by an air cylinde r operator (air to open; spring to close).
Closure time is adjustable. Maximum clos ure time is 7 seconds after receipt of a closure signal. Main steam isolation valve closure signals are as follows:
- 1. High containment pressure.
- 2. High steam flow with coincident lo-lo average primary cool ant temperature.
- 3. Low steam pressure.
- 4. Manual.
These valves are located in the Intermediat e Building downstream of the main safety valves.
The quick closing main steam isolation valves prevent reverse flow of steam. If a steam line rupture occurs between an isolation valve and a steam gener ator, the affected steam generator continues to blow down, while the isolation valves are automatically closed to prevent blowdown from the unaffect ed steam generators.
Should an isolation valve not close, flow from the Main Steam System downstream of the main isolation valves is limited by either normally closed valves or by valves that are automatically closed by interlocks from the NSSS system or from the turbine generator system as tabulated in Table 10.3-2. This small steam flow does not impact the results of the main steam line break analysis in Section 15.4-2.
If a main steam line rupture occurs downstream of an isolation valve, all 3 isolation valves are automatically clos ed, stopping main steam flow.
Closure of the isolation valves terminates the sudden large release of energy in the escaping steam, thereby preventing rapid cooldown of the Reactor C oolant System. Closure of the isolation valves also ensures a supply of steam for the 100% capacity, turbine driven emergency feedwater pump.
The maximum permissible main steam isolation valve leakage in the direction of normal flow is in accordance with the recommendations of MSS SP-61
[4]. In the direction of reverse flow, leakage is less than 1% of normal steam flow through the main steam isolation valve.
10.3-6 Reformatted Per Amendment 02-01 10.3.2.4 Main Steam Safety Valves Main steam safety valves are located in each main steam line outside the Reactor Building, upstream of the main steam isolat ion valves to protec t the steam generators against overpressure. These valves are designed, fabricated and stamped in accordance with the ASME Code,Section III.
The safety valve setpoints are given in Table 10.3-1a. The safety valves are siz ed to pass the steam flow resulting from complete load rejection or shutoff of main steam flow without reactor trip. The maximum steam flow through each individual va lve is limited to 970,000 lb/hr at steam generator design conditions, in accordance with Nuclear Steam Supply System criteria.
In the event that a single main steam safe ty valve sticks in the full open position, uncontrolled blowdown from the affected st eam generator is restricted within limits compatible with maintenance of reactor fuel integrity an d integrity of the reactor internals.
10.3.3 EVALUATION The Main Steam Supply System design limits t he effects of a main steam line rupture.
Seamless pipe is used inside the Reactor Building and for the spool piece of the penetration terminal end outside the Reactor Build ing. This minimi zes the probability and consequences of postulated pipe rupture. Rupture of any main steam line, malfunction of any single isolation valve, or any consequential damage does not cause uncontrolled flow from more t han 1 steam generator, nor does it result in containment pressure exceeding the design value.
The effects of pipe whip are considered in the layout of the syst em. Safety-related equipment is protected from t he effects of pipe whip by re straints, physical separation, and/or barriers, if required.
Pipe rupture is discussed in det ail in Section 3.6, seismic design is discussed in Section 3.7.
10.3.4 INSPECTION AND TESTING REQUIREMENTS Inspection and testing requirements for the Main Steam Supply System can be divided into 2 parts: preoperational testing and inservice testing and inspection.
- 1. Preoperational Testing
Preoperational testing of the Main Steam Supply System includes:
- a. Cold hydrostatic testing.
- b. Hot functional testing, including test of the functional capability of system valves.
- c. Preservice inspection to establish baseline data for subsequent inservice inspection, as required by the ASME Code,Section XI.
10.3-7 Reformatted Per Amendment 02-01
- 2. Inservice Testing and Inspection
Inservice testing and inspection of the Main Steam Supply System includes:
- a. Main steam isolation valve testing as follows:
(1) The main steam isolation valves are capable of being tested during normal plant operation to demonstrate t heir ability to respond to a "test close" signal. Upon receipt of a "test close" signal, the main steam isolation valve being tested moves to a 90 to 95% open (5 to 10% closed) position. Upon removal of the "test close" signal, the valve returns to the 100% open position. In the event that a close signal is received during this test, such a signa l overrides the test signal and the isolation valve closes completely withi n the specified closing time. This testing is no longer performed based on NUREG 1482, "Guidelines for Inservice Testing at Nuclear Power Plants," Section 4.2.4 recommendation.
(2) Testing for complete main steam isolation valve closure is performed under shutdown conditions and verifies t he ability of the valves to fully close within the specified closure time.
- b. Inservice inspection requirements, in accordance with the ASME Code,Section XI, apply to all Class 2 and Class 3 main steam piping from the steam generators to the point w here the main steam piping enters the Turbine Building.
Weld examinations are performed in acco rdance with the ASME Code,Section XI.
Inservice inspection of other Main Steam Supply System components within this boundary is discussed in Section 5.7. System components no t within this boundary are not subject to inservice inspection.
RN 03-034 RN 03-034 10.3-8 Reformatted Per Amendment 02-01 10.3.5 WATER CHEMISTRY Secondary side water chemistry "all volatile treatment" (AVT) for corrosion control consists of the following:
- 1. Addition of an amine or mixt ure of amines for pH control.
- 2. Addition of an oxygen scavenger to minimize dissolved ox ygen concentration.
- 3. Continuous steam generator secondary side blowdown to limit concentrations of dissolved and suspended solids.
- 4. A Condensate Cleanup System, consisting of filter/demineralizers, operated during startup to approximately 50% flow and as required during condens er leakage and if needed, during shutdown.
- 5. Boric acid may be added to mitigat e denting of steam generator tubes.
- 6. Ammonium Chloride may be adde d for molar ratio control.
- 7. Other chemicals may be added based on EPRI, NSSS supplier or SGOG guidelines and evaluation by SCE&G.
Secondary side water chemistry specifications are in accordance with the recommendations of EPRI. Recommendations of the NSSS supplier and/or the Steam Generator Owners Group (SGO G), may also be applied.
Samples of condensate, feedwater, steam, steam generat or blowdown, and demineralized makeup water are available for use in monitoring and controlling secondary side water chemistry. Sampling equipment is loca ted in the water treatment building and in the nuclear sampling room of the Control Building. Sampling equipment consists of pH, conductivity, cation conductivity, hydrazine, sodium, and dissolved oxygen analyzers for monitori ng the appropriate samples at reduced temperature and pressure.
Steam generator blowdown samp les are routed to the nucl ear sampling room, as are other potentially radioactive samples (see Section 9.3.2). Samples from other secondary side sample points are routed to t he sampling panel at the Water Treatment Building.
Grab samples are taken from secondary side sample points at regular intervals and are subjected to laboratory analyses to ensure t hat the analyzers are functioning properly and that secondary side water chemistry is within specification.
98-01 98-01 10.3-9 Reformatted Per Amendment 02-01 Steam generator water chemistry is cont rolled through sampling, steam generator secondary side blowdown, and chemical addi tion. During normal operation, amine injection for control of secondary side pH and oxygen scavenger fo r dissolved oxygen control may be regulated automatically or m anually. Under transient conditions, amine and oxygen scavenger injections are manually regulated as required by grab sample analytical results. Amine and oxygen scaven ger injection equipment is located in the Intermediate Building.
There are 3 possible mechanisms for hydrogen production in secondary side water.
These mechanisms are as follows:
- 1. Corrosion.
- 2. Decomposition of hydrazine.
- 3. Leakage and/or diffusion from the primary side.
Hydrogen production rates will be inconsequential and any buildup in secondary side water will not be a safety hazard.
The secondary water chemistry control program will include a comprehensive monitoring program. The aim of this program is the mi nimization of overall system corrosion. Special emphasis will be placed on the inhibition of steam generator tube degradation. In general, the program will be based on recommendations and criteria supplied by EPRI. Recommendations from the NSSS vendor and/or the SGOG may also be incorporated. This program consists of proc edures covering those items contained in Section 6.8 of the Technical Specifications.
10.3.6 STEAM AND FEEDWATER SYSTEM MATERIALS 10.3.6.1 Fracture Toughness Where specified, test met hods and acceptance criteria fo r fracture toughness are in compliance with the ASME Code,Section III, Article NC-2300. Charpy V-notch tests are specified for ferritic materials used in the following Class 2 components of the feedwater system:
- 1. Feedwater isolation valves. 2. Feedwater check valves. 3. Feedwater system Reactor Building penetration assemblies. 4. Feedwater piping.
98-01 98-01 10.3-10 Reformatted Per Amendment 02-01 Tests are specified for these feedwater system components because nominal pipe size exceeds 6 inches, material section thickness exceeds 5/8 inch and minimum service temperature can be as low as 50F inside containment and 40 F outside containment.
Fracture toughness testing (impact testing) for ferritic materials used in the Main Steam System piping whose nominal pipe size exceeds 6 inches and material section thickness exceeds 5/8 inch was pe rformed at a temperature of 120 F since minimum service temperature is approximately 327 F at 100 psia. This is the lowest temperature at which the steam generators are used to remove heat from the Reactor Coolant System. Testing was performed at 32 F on the main steam penetration process pipe.
The Residual Heat Removal System is used at lower temperatures and pressures. The ASME Code,Section III does not specifically r equire impact testing of materials used in the Main Steam Supply System.
The Code stipulates that the design specification must state whether or not impact testing is requir ed. In consideration of the high minimum service temperature for the Main Steam Suppl y System, impact testing is not specified.
Fracture toughness testing (impact testing) is not required for ferritic Class 2 and Class 3 components of the Emergency Feedwater System, since pipe, fittings, pumps, and valves in this system have a nominal pipe size less than 6 inches. Articles NC-2311(b) and ND-2311(b) of the ASME Code,Section III exempt these materials from impact testing requirements.
10.3.6.2 Materials Selection and Fabrication 10.3.6.2.1 Materials Not Included in Append ix I to Section III of the ASME Code Materials used are included in Appendix I to Section III of the ASME Code. Each line from the steam generators to the containment penetration assembly, inside the Reactor Building, is fabricated from SA-106, Grade C, seamless, carbon steel pipe material.
The first straight piece of pipe attac hed to the containment penetration assembly outside the Reactor Building is also of this material. The main steam lines from this point to the Turbine Building wall, incl uding piping in the penetration rooms and Intermediate Building, are fabricated from SA-155, KC-70, Class 1 welded, carbon steel pipe material.
Main steam piping within the Turbine Buildi ng is fabricated from A-155, KC-70, welded, carbon steel pipe material.
10.3.6.2.2 Austenitic Stai nless Steel Components No austenitic stainless steel components are used.
10.3.6.2.3 Cleaning and Hand ling of Class 2 and 3 Components Cleaning and handling of components is performed in accordance with Regulatory Guide 1.37 (see Appendix 3A) and ANSI N45.2.1
[5].
10.3-11 Reformatted Per Amendment 02-01 10.3.6.2.4 Preheat Temperatures Compliance with Regulatory Guide 1.50 is discussed in Appendix 3A.
10.3.6.2.5 Welding Procedures Compliance with Regulatory Guide 1.71 is discussed in Appendix 3A.
10.
3.7 REFERENCES
- 1. American National Standards Institute, "Power Piping C ode," ANSI B31.1.0, 1967, with Addenda through Summer, 1972.
- 2. American National Standards Institute, "Steel Pipe Flanges, Flanged Valves, and Fittings," ANSI B16.5, 1968.
- 3. American Society of Mechanical Engineers, "Recommended Practices for the Protection of Water Damage to Steam Turbines Used for Electric Power
Generation, Part II," TWDPS-1, April, 1973.
- 4. Manufacturers Standardization Societ y of the Valve and Fitting Industry, "Hydrostatic Testing of Steel Valves," MSS SP-61, 1961.
- 5. American National Standards Institute, "Cleaning of Fl uid Systems and Associated Components for Nuclear Power Plants," ANSI N45.2.1, 1973.
02-01 10.3-12 Reformatted Per Amendment 02-01 TABLE 10.3-1 ENVIRONMENTAL CONDITIONS CONSIDERED IN MAIN STEAM SUPPLY SYSTEM DESIGN Condition Normal and Upset I Upset II, Emergency, and Faulted Piping Inside Reactor Building - Most Severe Conditions (Emergency and Upset) Ambient Temperature, F 50 to 120 380, max. Ambient Pressure, psia 14.7 68.2, max. Relative Humidity, %, max. 100 100 Total Radiation, rad 2.5x10 7 1.9x10 8 Piping in Penetration Rooms Ambient Temperature, F 65 to 121 445, max. Ambient Pressure, psia 14.7 20.3, max. Relative Humidity, %, max. 90 100 Total Radiation, rad 2.4x10 6 1.6x10 7 Piping in Intermediate Building Ambient Temperature, F 65 to 131 398, max. Ambient Pressure, psia 14.7 17.8, max.
Relative Humidity, %, max. 90 100 Total Radiation, rad 1.5x10 6 1.6x10 7 02-01 02-01 RN 03-038 RN 03-008 02-01 02-01 RN 03-008 10.3-13 Reformatted Per Amendment 02-01 TABLE 10.3-1a MAIN STEAM SAFETY VALVE SETPOINTS Main Steam Line Valve Setpoint (psig) A 2806A-MS 2806B-MS 2806C-MS 2806D-MS 2806E-MS 1176 1190 1205 1220 1235 B 2806F-MS 2806G-MS 2806H-MS 2806I-MS 2806J-MS 1176 1190 1205 1220 1235 C 2806K-MS 2806L-MS 2806M-MS 2806N-MS 2806P-MS 1176 1190 1205 1220 1235 10.3-14 Reformatted Per Amendment 02-01 TABLE 10.3-2 STEAM GENERATOR FOR BLOWDOWN RATE Flow Path No. of Identical Paths Max. Flow (all paths combined)
Type Size, in.
Quality Design Code Valve Closure Time Actuation Closure Signal Power Quality Air Quality Atmospheric
Dump 3 2,910,000 lb/hr Globe 8 QR B31.1.0 3 Air Normally closed, see FSAR Section 10.4.4 for
control, fails closed 1E (Assoc)
and Non-1E NNS Condenser
Dump 8 7,760,000 lb/hr Globe 8 QR B31.1.0 3 Air Normally closed, see FSAR Section 10.4.4 for
control, fails closed 1E (Assoc)
and Non-1E NNS Steam Dump Drains (Trap) 4 1,052 lb/hr* Thermodynamic Steam Trap 1 NNS N/A N/A Self N/A N/A N/A Steam Dump Drains (Bypass) 4 93,272 lb/hr* Globe 1-1/2 NNS B31.1.0 5 Air Normally closed - fails open Non-1E NNS Turbine Cycle Sampling 3 5,265 lb/hr* Globe 3/8 NNS B31.1.0 N/A Manual N/A 2 of 3 valves normally closed N/A N/A Main Steam Drains / Upstream MSIV (Trap) 6 2,364 lb/hr* Thermodynamic Steam Trap 1 NNS N/A N/A Self N/A N/A N/A Main Steam Drains / Upstream MSIV (Bypass) 6 42,336 lb/hr Globe 1-1/2 NNS B31.1.0 5 Air Normally closed - opens on hi drain pot level switch signal Non-1E NNS Main Steam Drains / Downstream MSIV (Trap) 8 2,628 lb/hr* Thermodynamic Steam Trap 1 NNS N/A N/A Self N/A N/A N/A Main Steam to Turbine
Stop Valve 4 11,722,000 lb/hr Turbine Stop
Valve 30 QR B31.1.0 0.15 Hydraulic Normally closed post accident QR N/A 98-01 02-01 RN 04-018 02-01 RN 04-018 10.3-15 Reformatted Per Amendment 02-01 TABLE 10.3-2 (Continued) STEAM GENERATOR FOR BLOWDOWN RATE Flow Path No. of Identical Paths Max. Flow (all paths combined)
Type Size, in.
Quality Design Code Valve Closure Time Actuation Closure Signal Power Quality Air Quality Main Steam Drains /
Downstream MSIV (Bypass) 8 124,623 lb/hr Globe 1-1/2 NNS B31.1.0 5 Air Normally closed - opens on hi-hi drain pot level switch signal Non-1E NNS Gland Steam 1 32,000 lb/hr* Gate 4 NNS B31.1.0 30 Motor Manual remote closure - normally open Non-1E NNS Pegging Steam 1 160,000 lb/hr Globe 8 NNS B31.1.0 54 Air Normally closed, fails closed. Remains closed for a FW isolation. (Modulating control from PT-2231) Non-1E NNS Sparging Steam 1 16,000 lb/hr Globe 2 NNS B31.1.0 6 Air Normally closed, fails closed. Remains closed for a FW isolation. (Modulating control from PC-2232) Non-1E NNS MS to FW Pump 3 144,300 lb/hr* Turbine Control
Valve 4 NNS B31.1.0 1 Hydraulic FW Pump Turbine Trip Non-1E N/A MS to FW Pump Drains (Trap) 3 789 lb/hr* Thermodynamic Steam Trap 1 NNS N/A N/A Self N/A N/A N/A MS to FW Pump Drains (Bypass) 3 266,820 lb/hr Globe 1-1/2 NNS B31.1.0 N/A Manual N/A - Normally closed N/A N/A MS to Aux.
Steam 1 22,400 lb/hr Globe 2 NNS B31.1.0 6.1 Air Normally closed with steam from extraction. Non-1E NNS MS to Aux.
Steam (Bypass) 1 22,400 lb/hr Globe 1 NNS B31.1.0 N/A Manual N/A - Normally closed N/A N/A
- Paths that would normally be open following a Main Steam Line Break accident.
02-01 98-01 RN 04-018 02-01 10.3-16 Reformatted Per Amendment 02-01 TABLE 10.3-2 (Continued) STEAM GENERATOR FOR BLOWDOWN RATE Flow Path No. of Identical Paths Max. Flow (all paths combined)
Type Size, in.
Quality Design Code Valve Closure Time Actuation Closure Signal Power Quality Air Quality MS to Aux.
Steam Drains (Trap) 1 263 lb/hr* Thermodynamic Steam Trap 1 NNS N/A N/A Self N/A N/A N/A MS to Aux.
Steam Drains (Bypass) 1 13,860 lb/hr Globe 3/4 NNS B31.1.0 N/A Manual N/A - Normally closed N/A N/A Reheat Steam 1 1,189,540 lb/hr Gate 24 NNS B31.1.0 100 Motor Normally open. Closes on low pressure signal from PS-5635, following
turbine trip. Non-1E N/A Reheat Steam (Bypass) 1 148,000 lb/hr Gate 4 NNS B31.1.0 30 Motor Normally open. Interlocked to close with Reheat Steam Valve. Non-1E N/A MS Stop Valve Upstream Drain 4 94,752 lb/hr
- Globe 1 NNS B31.1.0 N/A Motor Open for startup, shutdown, turbine trip and <15% load. Non-1E N/A FW Turbine HP Stop Valve Upseat Drain 3 88,776 lb/hr
- Globe 1 1/2 NNS B31.1.0 30 Motor Open for startup, shutdown, turbine trip and <15% load. Non-1E N/A EFW Pump Turbine Stop Valve Drain 2 7,146 lb/hr* Globe 3/4 NNS B31.1.0 N/A Manual Normally open. Non-1E N/A
- Paths that would normally be open following a Main Steam Line Break accident.
02-01 98-01
1 2 B E D c 3 NOTES: 1 PIPING WITHIN THESE FLAGS IS TO MEET ALL THE*REQUIREMENTS EXCEPT FOR STAMPING, OF ASME CODE SECTION':III CLASS 2 AND IS SPECIFICALLY IN-CLUDED IN THE SCOPE OF SPECIFICATION SP-544-044461-000.
A 2.SEE GAl 0 WG SS-808-031 SHS.1-3 3 STEAM DUMP SYSTEM INCORPORATES POWER*RELIEF VAL VES IPV-2000-MS,IPV-2010-MS, AND IPV-2020-MS PER DWG 0-302-011 (BANK 4).4 STEAM DUMP(TO CONDENSER)
NOTE 2 STEAM DUMP (TO ATMOS)NOTE 2 COOL DOWN STEAM oUMP(TO CONDENSER)
NOTE 2 5 TO H.P.TURBINE TO H.P.TURBINE (2 PLACES)A BANK 1 (6 PLACES)B BANK 2 C BANK 3 (3 PLACES)6\
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.....IFr_F...,USER ZS*STEAM DUMP SYSTEM IN OPERATION FOLLOWING TURBINE TRIP, ACTUAL VALUES WILL VARY DEPENDING ON SPECIFIC OPERATING CONDITIONS DURING AND PRECEEDING STEAM DUMP.E 14 13 SYSTEM DATA x ra 6 PSIG OF BY REMARKS 1 0.820 965 542*2 1.639 100 338*3 0.879 991 545*A 4 5 6 o c B 902X 902X 902X 902X 6" z..-i.-i I-!6 11 I N<I en.-i a:: I 0 F('f)..c:...."ll;J I-!I I<I OJ ill 0:::: 0 RNd-16 RNd-16 RNd-16 XST-63C-MB""-/XST-63B-MB XST-63D-MB S S NOTE A NOTE A S NOTE A RNd-16/XST-63A-MB S NOTE A Z l---l<I 0:::: o NOTES: A.TEMPORARY STRAINER FOR SYSTEM CLEAN UP, TO BE REMOVED AFTER FINAL FLUSH.F 12//12 11 G (]<2>I t*___1 IFV-2127-MB IPI-2128-HR1-MB RMa9 1 IPI-2128-HR2-MB ROb-9 15 6/24/02 JMR REV1SED PER ECR-70025 MGR JEG 14 7/25/97 RHM REVISED PER CGCC-97-0381 LEK MGR 13 5/12/96 DDJ REVISED PER MRF-90102 JMG GVM 12 07/26/93 ACI REVISED PER MRF-22407 JHR JAC 17 7/01103 DDJ REVISED PER MRF-90102 MGR PRB 16 04/08/03 JTS CADD ENHANCED PER ECR-50239 MGR DDJ LE NO.DATE BY REVISION CKD.BY APPROVAL RMa8 IFV-2126-MB CONDENSER (L.P.SHELL)12" 12 11 1 ROb-9 IPI-2118-HR2-M8 ROb-9 IPI-2118-HRI-MB 12/1 ROb-9 IPI-2108-HR2-MB ROb-9 IFV-2106-MB IPI-2108-HRI-MB RMa4 12/1 1 CONDENSER (H.P.SHELL)12/1 1 ROb-9 IPI-2098-HR2-MB ROb-9 IPI-2098-HR1-MB 1 K J Hglb2 ROb-c)(iJJ IPI-2105-HR2-MB JROb-c)TC-lIPI-2105-HR1-MB Q\ROf37 XCN-1-CW Q\270c)-MB FSAR FIGURE 10.3-4'<if@7 TC-1"=/0.XCN-2-CW 3/
SOUTH CAROLIN4 ELECTRIC" G4S C0IP4NYROb-q'\!3 ROb-'l DRAWING LEGIBILITY
,&i IPI-2095-HR1-MB/
..,...... 12710-MB CLASS 1 VIRGIL C.SUHMER ttJCLEM STATION 13 ROb-'l.7.4:"-c)02X VENT PIPING SYSTEM FLOW DIAGRAM J$12711-MB L!JROb-c)SCE8<G CAD ENH.ANCED M.AJN STEAM DUMP SYSTEMNOTES;VENT 12712-MBHYDROSTATIC TEST TEMP.60" F 1 STEAM DUMP VALVES PASSING 6 6 DESIGN ENGINEERING K*NO R MAL DU MP FL 0 W PER VAL VE.74 X 10 LB/H R V.c.SUUt,£R NUCLEAA ST JENKINSVILlE, S.C._3 100 400 130 380<1%-HNGHNG NOTES 1&2 FOR NORMAL DESIGN CONDITION."ADE CHECKED LE APPROVPI.g 2 0 AMB 1005 560<1%1185HNGHNG NOTES 1&2 2.STEAM DUMP VAL YES PASSING VAL VE FOR 1.RHM MGR 3.JEW 0 MAXIMUM ALLOWABLE FLOW PER N CONDTION..1.*.%X 10 6 LB.lHR.UPSET DESIG_1 1185 600 1284 600<1%780 HNG HNG NOTE 3 3.MAIN STEAM DESIGN CONDITIONS D-302-031 17 M Ill>PSIG F PSIG F DURATION HYD PER 0-302-012.
ORAW1NG"-,HBER SHT.NUllBER REV Q
__
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__----;:::, W 5'10'15'20' 10.4-1 Reformatted November 2017 10.4 OTHER FEATURES OF STEAM AND POWER CONVERSION SYSTEM 10.4.1 MAIN CONDENSER The main condenser acts as a heat sink for the 2 low pressure turbine exhausts, limiting the back pressure and thus increasing the amount of available work from the turbines.
The main condenser also serves as a collection point for main steam dump flow, low pressure heater drains, and other miscellaneous flows, as well as, being the makeup point for the secondary cycle. It deaerates and provides storage capacity for the condensate system.
The auxiliary condensers are heat sinks for their individual feed pump turbines.
Condensate from these condensers is returned to the main condenser.
10.4.1.1 Design Bases The main condenser is of the dual shell, dual pressure type (a high pressure shell and a low pressure shell). The high pressure shell is designed to operate at ~2.91 inches, HgA. The low pressure shell is designed to operate at ~2.13 inches, HgA with a design cooling water inlet temperature of 77F (circulating water temperature). The low pressure shell features a false bottom plate which separates the low pressure condensing zone of the shell from a high pressure storage zone. The low pressure zone is connected to the high pressure zone by a downcomer. Condensate flows fro m the low pressure zone at a temperature of ~103.23F to the high pressure zone by gravity. Condensate from the high pressure zone of the low pressure shell flows by gravity to the high pressure shell where it is reheated to 115.04°F by mixing with high
pressure shell hotwell condensate. The condensate is reheated to the saturation temperature of the high pressure shell at the design point. The condensate pumps take suction from the high pressure shell. The design temperature of condensate out of the high pressure shell is ~ 115.04°F. Normal maximum operating pressure of the main condenser is limited to approximately 5 inches, HgA, and 175°F at the turbine exhaust to any shell. Condenser design capacities are listed in Table 10.4
-1. Radioactivity concentrations in the condenser are expected to be approximately equivalent to the concentrations given in Table 11.1
-5 for steam. Radioiodine concentrations in the condenser should be slightly lower because of a main condenser/air ejector partition factor of 0.15 for volatile iodine species.
Noncondensable gases are removed by the vacuum pumps described in Section 10.4.2. Design air inleakage rates are 40 scfm for normal main condenser operation and 15 scfm, total, for normal auxiliary condenser operation.
The main condenser will receive approximately 6.93 x 10 6 lb/hr of main steam from the Turbine Bypass System. This flow is bypassed to the condenser as required following a large load rejection, turbine trip, or other similar occurrence.
RN 99-01 RN 99-01 10.4-2 Reformatted November 2017 Main steam pressure is reduced to approximately 100 psig by the turbine bypass system at the condenser main steam dump inlet header. The steam is then dispersed by the main condenser through an internal spray pipe which directs the steam flow to a stainless steel baffle.
This internal arrangement and the relatively low pressure (100 psig) protects the tubes and other components from impingement damage failure.
The condenser hotwell is capable of maintaining a normal water level corresponding to a retention time of at least 2 minutes (approximately 39,200 gallons).
Each condenser shell is provided with a compartmented hotwell and leak detection trays. A tray is located inside the hotwell adjacent to the tubesheet of each waterbox.
The compartmented hotwells and leak detection trays are continuously sampled to provide early detection of tube leakage. Design of the compartmented hotwells and leak detection trays permits obtaining local samples to facilitate locating of tube leaks if necessary.
The combination of good quality (lake) cooling water and stainless steel tubes reduces corrosion and erosion of condenser tubes. An Amertap cleaning system is also provided for use in maintaining condenser tube cleanliness.
10.4.1.2 System Description The main condenser is of the dual shell, dual pressure type with a rubber expansion joint in each neck. Circulating water is arranged to pass through the 2 sections in series. Condenser leakage is monitored by installed condensate monitoring instrumentation with an associated alarm in the control room. Heaters 5A and 6A are installed in the low pressure shell; heaters 5B and 6B are installed in the high pressure shell. During normal operation the main condenser receives the following flows:
- 1. Main turbine exhaust steam.
- 2. Auxiliary condenser condensate and vents.
- 3. Low pressure heater drains.
- 4. Steam and water associated with the Turbine Gland Sealing System.
- 5. Condensate makeup.
- 6. Auxiliary condenser air removal (Low Pressure Condenser).
00-01 RN 06-041 10.4-3 Reformatted November 2017 Possible additional flows during startup, shutdown or under transient conditions include:
- 1. Condensate pump and steam packing condenser minimum flow recirculation.
- 2. Startup vents.
- 3. Moisture separator/reheater drains.
- 4. Turbine bypass flow through the Main Steam Dump System.
10.4.1.3 Safety Evaluation Disassociated hydrogen and other noncondensible gases are removed by the mechanical vacuum pumps to the atmosphere. These noncondensible gases may be routed to the Auxiliary Building Ventilation System charcoal filters if radiation levels in
excess of established limits exist in the vacuum pump discharge. In the event 1 vacuum pump fails, another is available on standby. Thus, hydrogen buildup does not occur during operation of the condenser.
The influence of the main condenser on the Reactor Coolant System is reduced by the decoupling effect of the deaerator and steam generator water inventories. Therefore, control functions associated with the main condenser do not directly influence the operation of the Reactor Coolant System.
If the condenser pressure should start to rise, exhaust hood sprays are activated by a turbine exhaust hood temperature signal. Normal operation of the main condenser and its associated control functions do not affect the Reactor Coolant System. The only main condenser control function indirectly affecting the Reactor Coolant System is the loss of condenser vacuum which results in turbine trip. A turbine trip due to loss of condenser vacuum results in programmed steam dump to the atmosphere and reactor shutdown. Provisions for protection of safety
-related equipment from flooding as a result of condenser failure are discussed in Section 7.6.
10.4.1.4 Tests and Inspections The condenser is subjected to a shell side hydrostatic test in the field. The pressure is limited to the static head of water at the turbine flange.
Condenser tubes are subjected to eddy current testing to ensure leak tight operation.
The tubes are also subjected to periodic hydro cleaning to remove any scale, silt, or biological material which may inhibit heat transfer.
RN 02-022 10.4-4 Reformatted November 2017 10.4.1.5 Instrumentation The high pressure and low pressure condenser shells are equipped with level controllers for sensing of condenser water level. These level controllers provide signals to control valves which control the supply of condensate to the condensate storage tank and normal or emergency condensate flow to the condensate system. At low
-low hotwell level, these level controllers open the demineralized water makeup valve to the low pressure hotwell. Monitoring of condenser water level is accomplished through level transmitters which provide signals to level indicators on the main control board in the control room. Each condenser shell has 1 pressure switch and 1 pressure transmitter to provide tripping and interlock functions upon loss of vacuum. If either of the pressure switches sense loss of vacuum, the turbine generator is tripped. The pressure transmitters operate bistables which interlock the turbine bypass system to prevent steam dump to the condenser upon loss of vacuum (see Section 10.4.4).
Condenser vacuum is indicated and low vacuum is alarmed in the control room.
Condenser instrumentation is shown schematically on Figures 10.4
-8 and 10.4
-9. 10.4.2 CONDENSER AIR REMOVAL SYSTEM The Condenser Air Removal System maintains main and auxiliary condenser vacuum by removing noncondensible gases, including dissociated hydrogen and oxygen from the main and auxiliary condensers.
10.4.2.1 Design Bases The non-nuclear safety class Condenser Air Removal System is designed to establish main and auxiliary condenser vacuum during plant startup and to maintain vacuum during normal operation. Mechanical vacuum pumps remove noncondensible gases from the main condensers and the auxiliary condensers via the main condensers.
Under normal conditions, discharge is through the Auxiliary Building Ventilation System charcoal filters. Provision is made for discharge of the noncondensibles to atmosphere.
Mechanical vacuum pumps are designed for the capacities listed in Table 10.4-1 in accordance with Heat Exchange Institute Standards[4]. Piping and valves are designed in accordance with ANSI B31.1[1] and B16.5[2], respectively.
10.4.2.2 System Description Two (2) subsystems comprise the condenser air removal system: the main condenser air removal subsystem and the Auxiliary Condenser Air Removal Subsystem. Figure 10.4-1 provides the system diagram.
Each of the 2 main condenser shells is evacuated by an individual, 100% capacity, mechanical vacuum pump. A third pump is provided for backup. These pumps are used both to establish vacuum during plant startup (hogging) and to maintain vacuum during operation (holding).
02-01 99-01 10.4-5 Reformatted November 2017 The auxiliary condensers are piped to and normally aligned to the LP main condenser shell to maintain vacuum. Additionally, there are 2 mechanical vacuum pumps provided as back up for the auxiliary condensers. One (1) mechanical vacuum pump can be used to maintain vacuum in the three auxiliary condensers. A second pump is provided for backup.
All vacuum pumps can be operated during startup to speed the hogging operation.
Cooling water for the mechanical vacuum pumps is supplied from the Turbine Building Closed Cycle Cooling System. Seal water is provided by the condensate system.
Both subsystems discharge through the Auxiliary Building Ventilation System charcoal filters through a common line under normal conditions. Condenser discharge radiation monitor, RM
-A9, is set to provide an alarm at approximately twice normal operating background. The high alarm is also normally set at approximately 2 times background.
Provision is made for obtaining local samples for analysis and evaluation.
10.4.2.3 Safety Evaluation The Condenser Air Removal System is not required to operate under emergency conditions nor is it necessary to achieve safe plant shutdown. Each subsystem is provided with a backup mechanical vacuum pump. Thus failure of an operating pump is not detrimental to continued plant operation.
Under normal conditions, the Condenser Air Removal System has no effect upon the Reactor Coolant System and radioactive leakage is negligible. However, should primary to secondary reactor coolant leakage occur, the flowpath through the Auxiliary Building charcoal filters limits the release of radioactivity to the environment. Anticipated release rates during normal operation are presented in Section 11.3.6.
10.4.2.4 Tests and Inspections The Condenser Air Removal System is operated continuously during normal plant operation. Therefore, periodic testing is not required. System operation is verified prior to initial plant startup by preoperational and startup testing. During subsequent plant startups, system operation is verified by observation during hogging operations. System components are readily accessible for visual inspection under normal plant conditions.
10.4.2.5 Instrumentation
- 1. Main Condenser Air Removal Local pressure and air flow indication is provided to monitor vacuum pump performance. Lube oil pressure and discharge air temperature switches are provided for startup and shutdown interlocks. Alarms are sounded in the control room to alert the operator to vacuum pump trip, vacuum pump lube oil pump trip, low oil pressure, high off gas air temperature, and high off gas radiation.
99-01 RN 02-057 RN 99-01 99-01 10.4-6 Reformatted November 2017
- 2. Auxiliary Condenser Air Removal Local pressure and air flow indication is provided to monitor vacuum pump performance. Lube oil pressure and discharge air temperature switches are provided for startup and shutdown interlocks. Alarms are sounded in the Control Room to alert the operator to vacuum pump trip and high lube oil temperature.
10.4.3 TURBINE GLAND SEALING SYSTEM 10.4.3.1 Design Bases Main turbine and feedwater pump turbine shaft seals are of the injection/labyrinth/leakoff type. These seals are designed to prevent air leakage into and/or steam leakage out of the turbine casings.
The Turbine Gland Sealing System is not safety
-related. Piping and valves associated with the system are designed in accordance with ANSI B.31.1[1] and ANSI B16.5[2], respectively.
10.4.3.2 System Description Sealing steam is normally supplied to the Turbine Gland Sealing System from the Main Steam Supply System under all load conditions. Steam for turbine gland sealing may be provided by the auxiliary boiler through the Auxiliary Steam System. The sealing steam passes inward through the seals toward the turbines to a leakoff which is piped to the condenser. Gland sealing steam also passes though the seal toward the outside where it enters the vent annulus. The vent annulus is maintained at a slight vacuum by the steam packing condenser.
A small amount of air is drawn into the vent annulus and this air, together with the sealing steam, goes to the steam packing condenser. In the steam packing exhauster, the steam is condensed and the remaining saturated air is discharged to the atmosphere by a motor driven blower.
The turbine gland seal exhaust blower is part of the steam packing exhauster which is located in the Turbine Building at elevation 439'. Saturated air from this blower is discharged through a 12 inch pipe to the turbine building roof near the Intermediate Building wall. The saturated air is discharged to atmosphere approximately 8 feet above the roof (elevation 522').
This discharge is not monitored for radiation. Radiation monitor RM-A9, which monitors the Main Condenser Air Removal System discharge, actuates an alarm in the event of primary to secondary leakage.
The LP turbine seals operate against vacuum at all times.
Pressure in the steam seal header is automatically controlled by steam seal regulating valves. 99-01 RN 02-022 RN 02-022 10.4-7 Reformatted November 2017 10.4.3.3 Safety Evaluation As long as a steam generator tube leak does not occur, the steam supplied to the Turbine Gland Sealing System is nonradioactive. A steam generator tube leak may result in small amounts of radioactive process steam leakage from the steam packing condenser. Such steam generator tube leakage would be detected by the Steam Generator Blowdown System radiation monitor (RM
-L3) or the condenser exhaust radiation monitor (RM
-A9). See Sections 10.4.8 and 11.4.
Suitable manual regulator bypass valves are provided for use under emergency conditions. Relief valves are included to protect the system from over pressurization. 10.4.3.4 Tests and Inspections No special tests or inspections are required.
10.4.3.5 Instrumentation Steam seal header pressure is automatically controlled by a steam seal feed valve and a steam packing unloading valve. Controls for system operation, such as pressure indicators, switches, transmitters, and controllers are mounted on a local panel and the main control board. Additionally, a local level alarm switch and temperature indicator are provided.
10.4.4 TURBINE BYPASS SYSTEM 10.4.4.1 Design Bases The Turbine Bypass System is capable of bypassing main steam to the main condenser and/or to the atmosphere. This provides an artificial steam load for the steam generators so that differences between reactor output and turbine generator load can be absorbed without imposing undesirable transients upon the nuclear steam supply syste m. System design permits the accommodation of large load reductions without reactor trip during most times in core life. The system also permits a gradual, orderly cooldown of the reactor to the point where the Residual Heat Removal System can assume the cooling function. The Turbine Bypass System is designed to operate in conjunction with the turbine generator, when available, or without the turbine generator if required.
When including the power relief valves, it has sufficient capacity to pass ~ 93.6%
of main steam flow at full load temperature and pressure. Capacities of individual valves in the Turbine Bypass System are presented in Section 10.4.4.2. The capacity of any 1 valve in the system does not exceed 970,000 lb/hr at 1,200 psia when fully op en. RN 02-022 10.4-8 Reformatted November 2017 The Turbine Bypass System was originally designed to accommodate a full load rejection, defined as a reduction from 100% of rated turbine generator load to plant auxiliary load without a reactor trip. The transition to 18 months cycles, to less negative moderator temperature coefficients at the beginning of the fuel cycle, and to a full power Tavg operating window of 572F to 587.4F has, however, reduced this capability. Best estimate analyses indicated that a full load rejection is possible at all times in core life when operating with a full power Tavg of 587.4F. However, at a full power Tavg of 572F, full load rejection capability is feasible only for times in core burnup when the full power moderator temperature coefficient that is more negative than
-18pcm/F. Therefore, full load rejection capability cannot be guaranteed for all values of full power Tavg and for all time in core life. Generally, margin to trip improves with core burnup due to the more negative moderator temperature coefficient. Step load changes of up to 10% can be accommodated by the reactor control system in automatic mode without a reactor trip or actuation of the turbine bypass system.
System valves, piping and related equipment are designed and fabricated to satisfy th e
requirements of the following codes and standards and are non
-nuclear safety class, non-Seismic Category 1, except as noted below:
- 1. Power relief valves are designed and fabricated to satisfy the ASME Code,Section III, Class 2[5], and are classified Safety Class 2a, Seismic Category 1.
- 2. Atmospheric and condenser dump valves are designed and fabricated to satisfy ANSI B16.5[2]. 3. Vent diffusers are designed and fabricated to satisfy the ASME Code, Section VIII[6]. 4. Inline diffusers are designed and fabricated to satisfy ANSI B31.1[1]. 5. Piping is designed and fabricated to satisfy ANSI B31.1[1] and associated standards for fittings, flanges, etc.
Additionally, the Turbine Bypass System is designed to satisfy Occupational Safety and Health Act (OSHA) requirements concerning noise levels during operation.
10.4.4.2 System Description The Turbine Bypass System is shown schematically by Figure 10.3
-1. The system is comprised of the following components:
02-01 02-01 02-01 02-01 02-01 02-01 10.4-9 Reformatted November 2017
- 1. Condenser Dump Valve/Diffuser Combinations Eight condenser dump valved/diffuser combinations are provided and described in Table 10.3
-2. The valve/diffuser combinations have an average rated/calculated capacity of ~ 6.74% of the main steam flow at full load pressure and temperature, thereby providing a bypass capacity to the condenser of ~ 53.95% of rated main steam flow. Each valve is provided with an inline diffuser mounted downstream of the valve. This combination produces reduced noise levels compared to levels generated by a valve without the diffusers. The system configuration separates the valve and diffuser, permitting location of the valve to allow easy access for maintenance. The diffusers are mounted in pairs in large, straight headers leading directly to the main condenser. Thus, problems associated with routing large diameter, hot piping are minimized.
- 2. Atmospheric Dump Valve/Diffuser Combinations Three atmospheric dump valve/diffuser combinations are provided and described in Table 10.3
-2. The valve/diffuser combinations have an average rated/calculated capacity of ~ 6.95% of the main steam flow at full load pressure and temperature, thereby providing a bypass capacity to the atmosphere of ~
20.85% of rated main steam flow. Each valve is provided with a diffuser mounted downstream of the valve. The system configuration separates the valve and diffuser, permitting location of the valve to allow easy access for maintenance. The diffusers are mounted on the intermediate building roof and discharge directly to the atmosphere.
- 3. Power Relief Valve/Diffuser Combinations Three power relief valve/diffuser combinations are provided. The power relief valves are similar to the atmospheric dump valves previously described, except for the design codes applied. The valve/diffuser combinations have an average rated capacity of ~ 6.25% of the main steam flow at full load pressure and temperature, thereby providing a bypass capacity to the atmosphere of ~ 18.76% of rated main steam flow. These valves serve a dual purpose. They operate in conjunction with the atmospheric dump valves to provide additional steam dump capacity to the atmosphere and they also serve as power operated relief valves for the steam generator secondary side.
The power relief valves are Safety Class 2a and are located outside the Reactor Building, upstream of the main steam isolation valves in Safety Class 2a main steam piping. Piping downstream of the power relief valves, between the valves and diffusers is non
-nuclear safety class.
10.4-10 Reformatted November 2017 Operability testing of the valves was performed in accordance with the recommendations of Regulatory Guide 1.48 [11] as discussed in Appendix 3A. Electrical components (solenoid valves and position indicator limit switches) mounted on the valves are qualified to satisfy IEEE
-382-1972.[10] 4. Piping and Other Valves System piping is provided to convey the steam to the condenser and to the Intermediate Building roof, where it may be discharged to the atmosphere. Manual isolation valves are provided for all control valves in the system to permit maintenance without shutting down.
Turbine Bypass System control functions and control interactions with other plant controls and systems are discussed in detail in Section 7.7.1. A detailed analysis of system design adequacy is presented in Section 7.7.2.
10.4.4.3 Safety Evaluation The Turbine Bypass System is not required for plant control following an accident and is not a safety related system. Failure of any single control valve to a wide open position results in uncontrolled secondary side blowdown that is within limits compatible with maintenance of reactor fuel integrity and integrity of the reactor internals.
The capacity of the power relief valves is in addition to that required by the ASME Code,Section III [5] for overpressure protection of the steam generators. Steam generator overpressure protection is provided by the main steam safety valves, discussed in Section 10.3.
Failure of the Turbine Bypass System to operate does not preclude operation of any essential systems since this system does not interface with any essential systems.
Postulated failure of Turbine Bypass System high energy piping will not adversely affect or preclude operation of any safety- related systems or components located close to the Turbine Bypass System. Postulated pipe rupture of high energy lines in the Turbine Bypass System is analyzed as discussed in Section 3.6.
10.4.4.4 Tests and Inspections The Turbine Bypass System is tested prior to commercial operation. Proper system response to simulated temperature and pressure inputs is verified during preoperational testing. During hot functional testing, each valve is stroked open and closed to verify operation. After entering service, periodic testing is performed to assure availability.
The power relief valves, which are Safety Class 2a, are tested and inspected in accordance with the applicable ASME Code, prescribed under 10CFR50.55a. This includes preservice and inservice inspection and test. Section 5.7 discusses a comprehensive program of compliance with the ASME Code,Section XI relative to inservice inspection.
02-01 02-01 02-01 RN 04-012 10.4-11 Reformatted November 2017 10.4.4.5 Instrumentation Applications Instrumentation and controls specifically related to the Turbine Bypass System are shown by Figures 10.3
-1, and 10.4
-3 through 10.4
-4b. Setpoints are listed in Table 10.4-2. They are provided to permit monitoring of system performance and to permit manual valve operation if required.
10.4.5 CIRCULATING WATER SYSTEM The Circulating Water System removes thermal energy from the main and auxiliary condensers and dissipates this energy to Monticello Reservoir.
10.4.5.1 Design Basis The principal performance requirement for the Circulating Water System is that it provide cooling water to the main and auxiliary condensers. The system is capable of pumping ~ 5.34 x 10 5 gpm of circulating water through the plant. This provides a heat transfer capability to the environment of 6.675 x 10 9 BTU/hr, with a nominal system temperature rise of 25F. This capability is adequate to satisfy system requirements for all normal and upset plant conditions, including turbine trip from full load. The system is not required to function under plant emergency or faulted conditions.
The following equipment is cooled by the Circulating Water System:
- 1. Main condenser - 2 shells. 2. Auxiliary condensers - 3 shells. 3. Circulating water motor bearing coolers are supplied only as backup cooling, (Normal Cooling Water Supply is from the Filtered Water System).
Circulating water is also used to wash the traveling screens and as a backup for circulating water pump motor bearings and jockey pump bearing lubrication.
Design parameters for major system components are presented in Table 10.4
-3. The design pressure and temperature requirements for piping, valves, and pressure retaining parts are tabulated in the lower left margin of Figure 10.4
-5. The upset condition tabulated is the shutoff head of the circulating water pumps. This condition occurs less than 1% of the time.
Circulating Water System piping and valves are designed in accordance with applicable industry codes and standards.
Condensers are designed in accordance with Heat Exchange Institute Standards. [4] Pumps are designed in accordance with Hydraulic Institute Standards. [9] 02-01 02-01 02-01 02-01 RN 08-001 10.4-12 Reformatted November 2017 10.4.5.2 System Description Circulating Water System water requirements are supplied by three 33
-1/3% capacity vertical wet pit pumps, located in the circulating water intake structure. The discharges from these pumps are headered into a main supply line to the plant. Two (2) or three (3) pumps are used during normal operation at reduced or full load.
The circulating water pumps can be controlled from the main control room or locally.
Six (6) traveling water screens and two 100% capacity screen wash pumps with a strainer provide screened water to the pumps.
A circulating water jockey pump is included in the system to fill the circulating water system during startup.
The main condensers are supplied with cooling water through branches from the main circulating supply line. These branches are equipped with motor operated butterfly valves and expansion joints at the condenser waterbox inlet and discharge.
The auxiliary condensers, also supplied directly from the main circulating water line, are three (3) ~ 50% capacity units equipped with motor operated butterfly valves at the inlet and with manual butterfly valves at the discharge. Expansion joints are provided at the inlet and discharge.
The main and auxiliary condenser piping is equipped with automatic tube cleaning equipment of the sponge ball type.
10.4.5.3 Safety Evaluation The Circulating Water System is independent of the emergency cooling facilities. It is not essential for safe operation and shutdown of the Nuclear Steam Supply System nor is it required to operate under accident conditions. Therefore, the system is non
-nuclear safety class, non
-Seismic Category 1.
A failure in the circulating water transport system inside the Turbine Building would be detected by a high water level alarm in the main condenser cleaning pit. As a result of effluent radiation monitor response capabilities the sump pumps located in this pit are limited to a combined maximum capacity of 2000 gpm. A leak exceeding the capacity of these pumps would activate an alarm when the water level in the main condenser cleaning pit approached elevation 390'. The main condenser cleaning pit is located within the Amertap strainer pit.
A continued rise of water into the Amertap strainer pit to elevation 400' actuates 2 groups of 3 level switches. The actuation of any 2 switches within either group trips the circulating water pumps and initiates pump discharge valve and high pressure condenser discharge valve closure. Another alarm signals tripping of the pumps and closure of the pump and condenser discharge valves.
99-01 RN 98-185 RN 01-051 10.4-13 Reformatted November 2017 The lowest design pressure for any component in the Main Circulating Water System is 50 psig. Design data and system data are shown on Figure 10.4
-5. To reduce the possibility of water hammer, slow closing, motor operated butterfly valves are used for condenser isolation.
A postulated complete failure of the condenser inlet expansion joint, which would result in an estimated flow rate of 780 ft 3 /sec, would actuate the condenser cleaning pit alarm in less than 5 seconds. The rise of water to elevation 400' and resultant actuation of the alarm and pump trip would require approximately 46 seconds.
At initiation of pump trip, the pump discharge valves and high pressure condenser discharge valves begin to close. These valves require approximately 120 seconds and 90 seconds, respectively, to reach the fully closed position.
Pump coastdown time is extremely short and, for all practical purposes, is considered to be negligible.
The total time required to stop circulating water flow from the instant of failure would be approximately 2 min - 50 sec. Water levels versus time for a postulated expansion joint failure are presented in Table 10.4
-3a. A completely failed expansion joint would cause flooding of the Turbine Building basement (see Figure 1.2
-16) up to elevation 413.5'. No essential systems or components are located in the Turbine Building. The lowest penetration of the Control Building or Intermediate Building walls, that could cause flooding from the Turbine Building, is at elevation 427', considerably above the flood elevation of 413.5'.
The system may be operated with less than 3 circulating water pumps in operation.
10.4.5.4 Tests and Inspection Testing of the Circulating Water System is limited to that normally provided for
non-safety related systems and includes:
- 1. Hot functional testing.
- 2. Normal, operational checking, and routine maintenance of the system.
10.4.5.5 Instrumentation System instrumentation is shown schematically on Figure 10.4
-5. The following instrumentation is provided to permit operator evaluation of major equipment performance and to provide a performance record:
- 1. Pressure indicators, switches, and test connections.
- 2. Level switches.
RN 01-051 02-01 99-01 10.4-14 Reformatted November 2017
- 3. Temperature indicators and test connections.
10.4.6 CONDENSATE CLEANUP SYSTEM The Condensate Cleanup System is provided to aid in maintaining feedwater and steam generator water chemistry within specifications during all modes of plant operation and as required during condenser leakage. Figure 10.4
-7a schematically illustrates the system. 10.4.6.1 Design Bases
- 1. The system is not safety related. Failure or malfunction of any system component will not affect the ability of the plant to achieve or maintain shutdown conditions.
- 2. The system is designed for cleaning up to approximately half of the maximum condensate flow.
- 3. System effluent purity will be within the limits provided in the Condensate System Design Basis Document as follows:
Total suspended solids, max. ppb 10 Sodium, max., ppb 1 Chloride. max., ppb 1 4. The system will be used when condensate polishing is required to maintain chemistry specifications.
- 5. Wastes from the system will be sent to the backwash receiving tank. Disposal from the tank will be dependent upon results of grab sample analysis.
10.4.6.2 System Description The purpose of the Condensate Polishing System (CPS) is to minimize the time for plant startup. During plant operation, the Steam Generator Blowdown System is in service for system cleanup. However, the CPS will be used (assuming no SG leaks) to better maintain prescribed chemistry parameters in the condensate and feedwater cycle. The CPS consists of 3 vessels in the condensate cycle. Two (2) vessels will be in service at a time with the third as a spare. The total flow through them will be a maximum of 8822 gpm (4411 each vessel). This is approximately 1/2 of the total condensate flow needed for full load capability of the V. C. Summer Nuclear Station, Unit 1. RN 00-01 10.4-15 Reformatted November 2017 The condensate polishers will be placed in service during plant startup for chemical cleaning of the condensate and feedwater cycles. There is a recirculation mode that will be used as a prestart cleanup of a major portion of the condensate and feedwater systems. This prestart cleanup will recirculate water using the condensate and feedwater booster pumps to the closed feed water isolation valves and back to the hotwell. On unit startup, the polishers can be on line via the condensate pumps until the plant attains approximately 50% full load capacity.
During shutdown of the unit, the CPS could be placed in service when the plant load is approximately 50% if system chemistry indicates a need for cleanup.
If the condenser develops a leak, which will be detected by the Condenser Leak Detection System, the leak location will be determined and that half of the condenser will be taken out of service for repairs. At this time, the unit will be at a load of about 50% and the condensate polishers can be placed in service to assist in removing chemical impurities introduced by the detected leak.
If a primary to secondary leak occurs, it will be detected by the steam generator leak detection system and the CPS will be isolated. It is not intended to operate the CPS if a SG leak occurs. In the event that the condensate polishers are used in the presence of a steam generator tube leak, all applicable Health Physics measures and precautions will be observed.
Depleted resins are backflushed to a backwash receiving tank from which samples will be taken and analyzed prior to release. The results of gamma isotopic analyses are then utilized via established station procedures and administrative controls to determine if a release is possible. If a release is acceptable, the normally disconnected spool piece is installed and the depleted resins are discharged to the settling pond through RML-11. RML-11 will alarm on the local control panel and stop the backwash transfer pumps to prevent a release if its setpoint is exceeded.
If a release is not acceptable and the resin must be handled as solid radwaste, the contents of the backwash receiving tank are discharged to a DOT approved low level radwaste container. Using a preinstalled filter arrangement and the dewatering equipment shown in Figure 10.4
-7a, excess water is removed from the powdex resin according to the Process Control Program for the packaging of low level radioactive waste. The resin may be dewatered to DOT requirements and shipped to a licensed low level radwaste burial facility. The dewatered resin may also be transported around to the Auxiliary Building truck bay entrance and solidified using the inplant solidification equipment.
RN 06-041 10.4-16 Reformatted November 2017 The anticipated operational information is as follows:
- 1. Flow rate each vessel:
condensate flow rate = 4411 gpm backwash flow = 375 gpm
- 2. Backwash frequency:
3 backwashes per 24 hr startup
- 3. Backwash holdup tank:
12,000 gallon capacity
- 4. Average backwash rate:
18 backwashes per year
- 5. Provisions exist for sampling condensate and resin backwash.
10.4.6.3 Safety Evaluation The Condensate Cleanup System is not safety related and is not required to ensure any of the following:
- 1. The integrity of the reactor coolant pressure boundary.
- 2. The capability to shut down the reactor and maintain it in a safety shutdown condition.
- 3. The ability to prevent or mitigate the consequences of accidents which could result in potential offsite exposures in excess of established limits.
Dissolved and suspended solid impurities within the condensate and feedwater circuits are not expected to contribute to plant activity levels. Any radioactive contamination that might occur in the Main Steam/Condensate System is actually reduced during the condensate cleanup process.
Scheduled, infrequent operation of the condensate polishers minimizes the possibility of producing potentially radioactive waste.
10.4.6.4 Tests and Inspections Prior to system startup, the service vessels are hydrostatically pressure tested and flushed clean. All components and instruments are checked for operational status.
During plant operation, instruments are routinely calibrated with known standards for accurate monitoring of pH, dissolved oxygen, sodium and conductivity. Continual surveillance and prescribed inspections of system components are standard operating procedures.
00-01 10.4-17 Reformatted November 2017 To assure protection of plant personnel and the environment during suspected primary to secondary steam generator leakage the following precautions should be taken:
- 1. Increased radiation survey frequency in the condenser polisher area.
- 2. Grab sample analysis prior to backwash receiving tank discharge will be extended to include tritium and isotopic
-y analysis. 10.4.6.5 Instrumentation Application Manually initiated, automatic backwash sequence controls are provided for use in replacing exhausted powdered resins. Resin trap strainers in the effluent stream have differential pressure switches to actuate alarms upon detection of high pressure drop.
An automatic bypass valve around the demineralizer system opens upon detection of excessive differential pressure. Instrumentation also indicates high differential pressure across a demineralizer vessel. The demineralizer is then manually removed from service and replaced by the standby vessel. Instrumentation is also provided to monitor effluent for sodium, pH, dissolved oxygen, and conductivity.
10.4.7 CONDENSATE AND FEEDWATER SYSTEMS 10.4.7.1 Condensate System The Condensate System pumps condensed turbine exhaust steam from the main condenser hotwell through the low pressure feedwater heaters to maintain deaerator storage tank level for anticipated operating conditions. It also serves as a source of cooling water for the steam packing condenser and the steam generator blowdown heat exchanger, and provides sealing water for various vacuum valves and the feedwater pump seals.
10.4.7.1.1 Design Bases Design conditions for system piping, valves, and pressure retaining parts are tabulated in the lower left margin of Figures 10.4
-8 and 10.4
-9. At the discharge of the condensate pumps, the upset condition bounds the discharge pressure of the condensate pumps under minimum recirculation. This condition is expected to occur less than 1% of the time.
Condensate pumps are designed in accordance with the requirements of the Hydraulic Institute Standards.[9] The original pump design point was selected to satisfy the requirements of the turbine thermal cycle (at pre
-uprate conditions) at the "valve wide open" condition, plus a wear margin.
For post-uprate operation, the design of the pumps was evaluated against predicted required flow plus an allowance for transients. 02-01 02-01 10.4-18 Reformatted November 2017 Low pressure feedwater heaters, deaerator, and deaerator storage tank are designed, fabricated, inspected, tested, and stamped in accordance with the ASME Code,Section VIII, Division 1.[6] Thermal performance is governed by the Heat Exchange Institut e Standards [7]. The Condensate System, except for the condensate storage tank, is non
-nuclear safety class. The condensate storage tank is Safety Class 2b, Seismic Category 1, since it is the primary inventory source for the Emergency Feedwater System.
The condensate storage tank is designed, fabricated, inspected, tested and stamped in accordance with the ASME Code,Section III.[5] During normal operation the condensate storage tank water level is not permitted to fall below a level corresponding to a usable volume of 160,054 gallons (see section 9.2.6.1). Makeup to the condensate storage tank is demineralized water, admitted through the condenser and condensate storage subsystem. See Section 9.2.6 for a description of condensate storage facilities.
Under transient conditions, the deaerator storage tank serves as an additional source of water for the Feedwater System, providing adequate net positive suction head (NPSH) for the feedwater booster pumps.
System piping and valves are designed in accordance with ANSI B31.1[1] and ANSI B16.5[2], respectively.
Design parameters of major components in the Condensate System are listed on Table 10.4-4. 10.4.7.1.2
System Description
The Condensate System contains three (3) 50% capacity motor driven condensate
pumps, a 50% capacity powdered resin filter/demineralizer cleanup system (see Section 10.4.6), 3 stages of closed low pressure feedwater heaters, associated piping, valves, and instrumentation. The 2 lowest stages of feedwater heaters are located in the condenser neck.
Equipment interfacing with, but not part of, the Condensate System includes the steam packing condenser and steam generator blowdown heat exchangers.
Condensate is pumped from the hotwell storage area, located below the main high pressure condenser, by 2 normally operating condensate pumps through the steam packing condenser. The condenser then passes through two 50% capacity, parallel strings of low pressure heaters to the deaerator and deaerator storage tank.
RN 06-041 02-01 99-01 02-01 10.4-19 Reformatted November 2017 Condensate pumps are of the 4 stage, vertical can, centrifugal type, and are electric motor-driven. Condensate flow is controlled by the deaerator level control valves which follow the difference between feedwater and condensate flow, trimmed by deaerator level. The pumps are protected from a low flow condition by individual recirculation valves back to the main condenser.
The steam packing condenser is a shell and U
-tube type heat exchanger. Condensate passes through the tube side. A manual bypass is provided for maintenance.
Low pressure feedwater heaters are shell and U
-tube heat exchangers with 2 heating zones: A condensing zone and an integral drain cooling zone. The three (3) 50%
capacity feedwater heaters in each string are bypassed and isolated as a group when necessary. A bypass line is provided for use when 1 heater string is out of service.
Turbine load must be adjusted according to the manufacturers instructions when a feedwater heater string is isolated.
The deaerator is of the horizontal, direct contact, tray type. The preheated condensate drops onto the stainless steel trays where it is scrubbed by rising steam. Condensate then passes from the trays to the deaerator storage tank which has a capacity of 75,000 gallons. Condensate is also supplied to the suction of the exhaust hood spray pumps. These pumps provide hood spray, gland sealing for various valves in vacuum service and seal water for vacuum pumps and feedwater pump seals. A small amount of condensate is used as the coolant for the steam generator blowdown heat exchangers.
10.4.7.1.3 Safety Evaluation Three (3) 50% capacity condensate pumps are provided. Two (2) of these pumps are normally operated. The third is in standby. Upon the trip of an operating pump, which is annunciated in the control room, the standby pump is started by the operator. No detrimental effect upon the Reactor Coolant System is realized.
System makeup is provided directly from the condensate storage tank to the low pressure condenser shell. Makeup to the condensate storage tank is accomplished by injection of demineralized water to the low pressure condenser shell and thence through the Condensate System to the condensate storage tank.
02-01 RN 06-041 10.4-20 Reformatted November 2017 Sentinel type, tube side relief valves are provided for all closed feedwater heaters. A feedwater heater tube rupture causes high level alarms in the Control Room and initiates automatic valve operation where appropriate. A high
-high level alarm on condenser neck heaters initiates turbine trip if the condition exists more than 10 seconds. Pressure, temperature, or flow deviations due to a malfunction in the Condensate System is not immediately felt by the Reactor Coolant System due to the capacity of the deaerator storage tank and the Feedwater System. The deaerator storage tank allows corrective action, an orderly runback to a compatible load, or shutdown.
10.4.7.1.4 Tests and Inspections Tests of the Condensate System are limited to that normally provided for non
-safety related systems and includes:
- 1. Hot functional testing. (Historical)
- 2. Normal, operational checking and routine maintenance of the system.
The closed, low pressure feedwater heaters were subjected to both shell and tube side hydrostatic tests at 150% of the respective design pressures. The shell sides were also tested for vacuum. Alterations to the shells to obtain higher maximum allowable working pressures call for leak tests at system operating conditions.
10.4.7.1.5 Instrumentation Applications Instrumentation provided for the Condensate System is shown on Figures 10.4
-8 and 10.4-11. This instrumentation is provided to permit operator evaluation of major equipment performance and to provide a record of equipment performance.
Instrumentation includes the following:
- 1. Pressure indicators, switches, and test connections.
- 2. Flow indicators, recorders, switches and test connections.
- 3. Level indicators, recorders, controllers and switches.
- 4. Temperature indicators, controllers, switches and test connections.
10.4.7.2 Feedwater System The Feedwater System is designed to pump feedwater from the deaerator storage tank through 2 stages of high pressure heaters to the steam generators. Thus, heated, deaerated water required to maintain steam generator water level is provided during normal operation, after startup, and before shutdown. 02-01 02-01 99-01 02-01 10.4-21 Reformatted November 2017 10.4.7.2.1 Design Bases Design conditions for system piping, valves, and pressure retaining parts are tabulated in the lower left margin of Figures 10.4
-10 through 10.4
-12. Feedwater System piping and valve components from and including the feedwater check valves to the steam generators are Safety Class 2a, Seismic Category 1 and are in accordance with ASME Code,Section III [5], Class 2 requirements. System components upstream of the feedwater check valves in the Intermediate Building, excluding branch lines 2 inches and less, are Quality Related safety class (QR), Seismic Category 1 and satisfy ASME Code,Section III [5], Code Class 2 requirements; however, are not code stamped. This piping is identified as "Note 1" piping on Figure 10.4-12. Feedwater piping in the Turbine Building is designed in accordance with ANSI B31.1 [1]; valves conform to ANSI B16.5. [2] The feedwater booster pumps and feedwater pumps are designed in accordance with the requirements of the Hydraulic Institute Standards
.[9] Original design points for these pumps were selected to satisfy the requirements of the turbine thermal cycle. At the "valve wide open" condition (pre
-uprate power), plus a wear margin.
High pressure feedwater heaters are designed, fabricated, inspected, tested, and stamped in accordance with the ASME Code,Section VIII, Division 1.[6] Thermal performance of these feedwater heaters is governed by Heat Exchange Institute Standards.[7] At less than approximately 3% plant load, the Emergency Feedwater System (see Section 10.4.9) is used to maintain steam generator water level. The Main Feedwater System is designed to overlap the Emergency Feedwater System down to the no load conditions but the Emergency Feedwater System is normally used for conditions such as startup and shutdown.
99-01 02-01 99-01 02-01 02-01 02-01 02-01 02-01 10.4-22 Reformatted November 2017 10.4.7.2.2
System Description
The Feedwater System is divided into nuclear safety class and non
-nuclear safety class portions. The nuclear safety class portion, downstream of and including the containment isolation valves, is schematically shown on Figure 10.4
-12. Feedwater System parameters are listed on Table 10.4
-5. The non-nuclear safety class portion of the Feedwater System includes four 33
-1/3% capacity, constant speed, motor driven, feedwater booster pumps; three 50% capacity, variable speed, turbine driven, feedwater pumps; 2 stages of high pressure heaters; valves, instrumentation, controls; and associated piping. The feedwater booster pumps take suction from the deaerator storage tank and discharge to the feedwater pump suction. The feedwater pumps discharge through 2 strings of high pressure heaters into a single 30 inch diameter header which distributes the feedwater to 3 feedwater flow control valves and/or 3 feedwater bypass control valves. A recirculation line runs from the termination of the 30 inch diameter header near the feedwater flow control valves to the deaerator. This line is equipped with block valves and a pressure breakdown orifice and is used during startup to permit warming of the Feedwater system to and including the 30 inch diameter header.
Feedwater flows from the feedwater flow control valves through individual lines and the feedwater isolation valves to the three steam generators.
The feedwater booster pumps are horizontal, split case, single stage and centrifugal pumps. They are motor driven at a constant speed of 1780 rpm. Minimum recirculation flow is bypassed to the deaerator storage tank, as required. Normally, 2 feedwater booster pumps operate at low load; three or four at intermediate or full load. Feedwater booster pumps provide the necessary flow and suction pressure for the feedwater pumps. Steam is supplied to the deaerator storage tank through a sparger during initial stages of Feedwater System warmup. This is followed by admission of pegging steam to the deaerator to complete Feedwater System warmup.
The feedwater pumps are horizontal, split case, single stage, double suction, and diffuser pumps. The speed of the variable speed turbine drive is varied and the feedwater flow control valves adjusted to maintain water levels in each steam generator. In general, 2 feedwater pumps are operated at low or intermediate loads. Three (3) feedwater pumps are operated at full load. Feedwater pumps are protected by minimum flow, recirculation lines to the deaerator storage tank.
High pressure feedwater heaters are shell and U
-tube type heat exchangers with 2 heating zones: a condensing zone and an integral drain cooling zone. The two 50%
capacity feedwater heaters in each string are manually bypassed and isolated as a group to remove the string from service if necessary. Turbine load must be adjusted according to the manufacturer's instructions when a feedwater heater string is isolated.
RN 06-006 10.4-23 Reformatted November 2017 10.4.7.2.3 Safety Evaluation
- 1. General If it becomes necessary to remove a feedwater booster pump or feedwater pump from service due to malfunction or failure or for maintenance, plant loads are reduced in accordance with a predetermined operating scheme. When the normal operating schemes are followed, the Feedwater System provides satisfactory service under plant operating conditions.
Reactor runback is minimized and reactor trip is avoided following loss of any 1 feedwater or feedwater booster pump from the normal operating scheme. It is possible to operate the Feedwater System beyond the normal operating scheme for short periods of time. Following the loss of any 1 operating feedwater booster pump or feedwater pumps, a power reduction may be necessary to prevent reactor trip due to low water level in the steam generators. Reactor trip is prevented when maximum pumping scheme capability satisfies or exceeds feedwater flow requirements at the time a pump is lost from service. The feedwater pumps and drive turbines may be operated at runout capacity temporarily, but extended off-design point operating results in drive turbine efficiency loss. The feedwater booster pumps may be operated up to their horsepower limits for extended periods of time without detrimental effects.
If a feedwater piping break should occur in the Intermediate Building, alarm and control devices act to prevent flooding of safety
-related equipment on the floors. Section 7.6 outlines the details of provisions for leak detection. Pipe break is discussed in Sections 3.6 and 15.4.2. As noted in Section 10.4.7.2.1, feedwater piping in the Intermediate Building, excluding branch lines, satisfies the requirements, except for stamping, of the ASME Code,Section III [5], Code Class 2, to provide greater assurance of piping system integrity and to minimize the potential for postulated pipe rupture.
The feedwater isolation valves are designed to close within 5 seconds after receipt of a closure signal to provide containment isolation in the event of a feedwater line break either inside or outside the Reactor Building. These valves are designed with safety related air accumulators and fail as is upon loss of control air or loss of channel B electric power and to close upon loss of channel A electric power. Valve status is indicated by lights on the main control board and is monitored by the plant computer. The channel B solenoid valves associated with each feedwater isolation valve are of the energize to close type. However, either the channel A or channel B solenoid valve is sufficient to close the feedwater isolation valve. Any of the following signals initiate closure:
- a. Feedwater isolation signal (channel A only, see Table 6.2
-54 signal D for initiating conditions).
02-01 10.4-24 Reformatted November 2017
- b. High-high Intermediate Building sump level switches energized (see Section 7.6 for initiating conditions, channel A only). c. Intentionally left blank by RN 00
-082 in Amendment 02
-01. d. Intentionally left blank by Amendment 96
-03. e. Intentionally left blank by RN 00
-082 in Amendment 02
-01. f. Manual switch train A in the control room.
- g. Manual switch train B in the control room.
The recommendations of the NSSS vendor are followed in routing of feedwater piping to minimize flow instabilities in the Feedwater System.
Standard industry safety precautions are observed in the handling of feedwater chemicals.
Table 10.4
-6 presents a Feedwater System failure analysis.
10.4.7.2.4 Tests and Inspections
- 1. Operability Test for Containment Isolation Valves The containment isolation valves are subjected to periodic operability tests in accordance with the applicable ASME Code, prescribed under 10CFR50.55a.
There are 3 containment isolation valves in this system: three (3) on the main feedwater line. These valves are tested for operability by complete closure and opening during plant shutdown.
- 2. System Tests Major equipment is periodically inspected to ensure proper conditions and operation. Additional testing includes:
- a. Hydrostatic testing of safety class system piping and equipment following construction and prior to placing the system in service.
- b. Hot functional testing subsequent to cold hydrostatic testing.
- c. Normal, operational checking, and routine maintenance of the system.
02-01 00-01 02-01 02-01 RN 04-012 02-01 10.4-25 Reformatted November 2017 Inservice inspection of safety class portions of the system is performed in accordance with the ASME Code, Section XI[8], requirements.
10.4.7.2.5 Instrumentation Applications Instrumentation for the Feedwater System is shown schematically by Figures 10.4
-10 through 10.4
-12. The following instrumentation is supplied for the non-nuclear safety class portion of the system to permit operator evaluation of major equipment performance and to provide a performance record:
- 1. Pressure indicators, switches, and test connections.
- 2. Flow indicators, controllers, and test connections. 3. Level switches.
- 4. Temperature indicators and test connections.
In the nuclear safety class portion of the system, instrumentation to permit monitoring of the temperature of feedwater entering the steam generators is provided.
Instrumentation associated with the development of control signals for the containment isolation valves is provided in Section 7.3 and Table 6.2
-54. 10.4.8 STEAM GENERATOR BLOWDOWN SYSTEM 10.4.8.1 Design Bases 10.4.8.1.1 General The Steam Generator Blowdown System continuously purges the steam generators of concentrated impurities, thereby maintaining secondary side steam generator water chemistry. The Nuclear Blowdown Processing System is used to process cooled steam generator blowdown fluid and return decontaminated water to the secondary cycle. The steam generator wet layup system skid provides forced circulation of the steam generator secondary side water inventory during cold shutdown conditions.
Steam generator blowdown fluid can be directed to any 1 of the following:
- 1. Nuclear Blowdown Processing System.
- 2. Circulating water discharge.
- 3. Alum sludge lagoon.
10.4-26 Reformatted November 2017 Steam generator blowdown fluid is normally directed to the Nuclear Blowdown Processing System or the circulating water discharge. During plant startup, steam
generator blowdown fluid may be directed to the alum sludge lagoon for reduction of suspended solids content prior to discharge. Radiation monitoring controls divert steam generator blowdown fluid to the Nuclear Blowdown Processing System upon detection of radioactivity in the fluid, thus limiting release of radioactivity to the environment.
The ATWS (Anticipated Transient Without Scram) Mitigation System Actuation Circuitry (AMSAC) isolates steam generator blowdown when 2 of 3 steam generators are at low-low level. During cold shutdown and refueling, the steam generator wet layup system skid may be attached between the blowdown and Emergency Feedwater Systems. The skid circulates water through the steam generators to provide improved mixing and less severe concentration gradients to mitigate steam generator fouling and corrosion.
10.4.8.1.2 Thermal Blowdown fluid from each steam generator is directed to a separate heat exchanger for heat recovery. A portion of the condensate flow serves as the cooling fluid in these heat exchangers. The heat exchangers are designed to cool the steam generator blowdown fluid to 120°F.
10.4.8.1.3 Secondary Side Contaminants Impurities associated with the secondary cycle include:
- 2. Ammonium chloride for molar ration control if required.
- 3. Boric acid for mitigation of steam generator tube denting if required.
- 4. Impurities associated with condenser leakage.
- 5. Ingress from the demineralized water system and/or the water treatment plant.
10.4.8.1.4 Primary Side Contaminants Impurities associated with the Reactor Coolant System may enter the steam generator secondary side should steam generator tube leakage occur. Such impurities include radioactive and nonradioactive particulate and dissolved material.
98-01 98-01 10.4-27 Reformatted November 2017 10.4.8.1.5 Operating Parameters
- 1. Total Blowdown Flow
- a. Minimum flow - 30 gpm. b. Normal flow - as required to maintain secondary side water chemistry.
- c. Design flow - 1.0% of main steam flow (nominally 250 gpm).
- d. Cold shutdown on steam generator wet layup system - 100 gpm (nominal flow). 2. Water Chemistry of Steam Generator Blowdown Fluid Blowdown flow from each steam generator aids in maintaining secondary side water chemistry specifications. The controlling parameters include pH, cation conductivity, sodium, chloride and sulfate.
- 3. Steam Generator Tube Leakage For purposes of radioactive release determinations, a primary to secondary leakage rate of 100 lb/day and 0.12% failed fuel is used. The leakage rate is derived from NUREG
-0017[3]. For the design of equipment, a primary to secondary leakage rate of 0.1 gpm (1195 lb/day) under standard conditions is assumed. Major contaminants considered include boron and lithium with primary coolant concentrations of 1000 ppm and 2 ppm, respectively.
10.4.8.1.6 Codes and Standards The Steam Generator Blowdown System is non
-nuclear safety class and quality related class, except for that portion inside the Reactor Building and up to the containment isolation valve which is Safety Class 2a, Seismic Category 1. Safety class and quality related class piping is designed in accordance with the ASME Code,Section III [5], Class 2. Non-nuclear safety class piping is designed in accordance with ANSI B31.1[1]. Equipment classification is presented in Table 3.2-1. 10.4.8.2 System Description The Steam Generator Blowdown System is illustrated by Figure 10.4
-13. Individually regulated blowdown from each steam generator is cooled and reduced in pressure prior to combination with other blowdown streams. The total blowdown is then processed through the Nuclear Blowdown Processing System or is routed into the circulating water discharge and thence to Monticello Reservoir.
98-01 98-01 RN 04-026 10.4-28 Reformatted November 2017 The Nuclear Blowdown Processing System is illustrated by Figures 10.4
-14 and 10.4-15. Should blowdown activity exceed preset levels, the blowdown flow is automatically diverted to the nuclear blowdown holdup tank. One (1) of 2 nuclear blowdown holdup tank pumps then takes suction from the holdup tank and delivers the fluid through a filter, 2 demineralizers in series, and a post filter from which it returns to the secondary cycle through the main condenser (an alternate path being to the penstocks of the Fairfield Pumped Storage Facility [see Figure 10.4
-17] during operation of that facility in the generation mode).
The Nuclear Blowdown Processing System includes a sluicing pump and spent resin storage tank for transfer and storage of exhausted demineralizer resin. Processing of solid waste is accomplished by the Solid Waste Disposal System (see Section 11.5).
10.4.8.2.1 Component Description The general arrangement of system equipment is shown by Figures 1.2
-5 and 1.2-6. Design parameters for major components are presented in Table 10.4
-7. Major components of the Steam Generator Blowdown System include:
- 1. Radiation Monitors Radiation monitoring equipment is located to sample continuously the total Steam Generator Blowdown and Nuclear Blowdown Processing System demineralizer effluent. Section 11.4 describes radiation monitoring equipment in detail.
- 2. Steam Generator Blowdown System Heat Exchangers Each of the 3 Steam Generator Blowdown System heat exchangers consist of 2 shell and tube vessels in series, designed to cool the steam generator blowdown fluid with condensate.
- 3. Nuclear Blowdown Holdup Tank The nuclear blowdown holdup tank retains potentially radioactive steam generator blowdown fluid for processing.
- 4. Nuclear Blowdown Monitor Tank The nuclear blowdown monitor tank is similar in design to the nuclear blowdown holdup tank. This tank provides additional holdup capacity, if required, as well as the capability for periodic effluent sampling.
- 5. Nuclear Blowdown Holdup Tank Pumps Two (2) 100% capacity, centrifugal, nuclear blowdown holdup tank pumps are provided. These pumps take suction from the nuclear blowdown holdup tank and discharge through the filter, demineralizers, and post filter.
99-01 10.4-29 Reformatted November 2017
- 6. Nuclear Blowdown Monitor Tank Pump A single, canned motor pump is provided. This pump takes suction from the nuclear blowdown monitor tank and discharges to the nuclear blowdown holdup tank or recirculates the monitor tank contents through the post filter.
- 7. Nuclear Blowdown Demineralizer Inlet Filter This inlet filter removes particulate matter from the holdup tank fluid upstream of the demineralizers, thus protecting against resin fouling and premature capacity loss. The filter is a disposable cartridge type. Pressure drop indication and an alarm are provided to alert the operator that filter media replacement is required.
Since the filter is potentially radioactive, shielding is provided for personnel protection. Radiological controls to reduce personnel exposure are implemented during spent filter cartridge removal and transportation to the drumming station.
- 8. Nuclear Blowdown Demineralizer Discharge Filter This post filter traps and retains degraded or crushed resin particles which may pass through the demineralizers during normal operation. Design of this filter and radiation protection considerations are similar to those for the nuclear blowdown inlet filter.
- 9. Nuclear Blowdown Sluice Filter The sluice filter is located on the discharge side of the resin sluice pump. Its function is similar to that described for the nuclear blowdown demineralizer discharge filter.
- 10. Nuclear Blowdown Demineralizers Four (4) ion exchange vessels, arranged for 2 step demineralization with 100%
standby capacity, are provided. This arrangement assures the capability for
continuous removal of radionuclides as well as high effluent purity. Operation of each demineralizer is on a nonregenerable basis. Resin is removed and replaced as dictated by chemical analysis or radioactivity measurements.
- 11. Nuclear Blowdown Spent Resin Storage Tank The nuclear blowdown spent resin storage tank is provided to permit recycling of resin sluice water, storage of spent demineralizer resin, and transfer of spent resin to the drumming station.
- 12. Nuclear Blowdown Resin Sluice Pump The nuclear blowdown resin sluice pump is used to loosen resin in and transfer resin from nuclear blowdown demineralizers.
10.4-30 Reformatted November 2017
- 13. Steam Generator Wet Layup System Skid The Steam Generator Wet Layup System Skid consists of a pump, two 100% filters in parallel, valves, connectors, flexible hoses, and a skid
-mounted motor control center. When used, during cold shutdown conditions, the pump suction is connected by flexible hose to the blowdown system and the discharge is similarly connected to the Emergency Feedwater System. 10.4.8.2.2 System Operation System operations are divided into three categories, as follows:
- 1. Normal Operation During normal plant operation, steam generator blowdown is continuous to maintain secondary side steam generator water chemistry within the limits recommended by the Nuclear Steam Supply System (NSSS) vendor. Blowdown is normally directed to the Nuclear Blowdown Processing System or to the circulating water discharge after passing through the steam generator blowdown heat exchangers.
The combined blowdown from the 3 steam generators is continuously sampled and analyzed for radioactivity. Should the activity level reach a pre
-established setpoint, the discharge paths are automatically isolated and the total blowdown flow is automatically diverted to the nuclear blowdown holdup tank.
Low specific activity effluent resulting predominately from continuous steam generator blowdown sampling may be processed from the nuclear blowdown holdup tank to the main condenser or Turbine Building sump. When high radiation setpoint is reached for RM
-L3 or RM-L10 and steam generator blowdown has been diverted to the holdup tank, the process pathway to the Turbine Building sump is terminated. The contents of the nuclear blowdown holdup tank are periodically analyzed for radioactivity and chemical contamination.
10.4-31 Reformatted November 2017
- 2. Special or Infrequent Operation As discussed in 1, above, blowdown radioactivity levels in excess of a pre-established setpoint (as sensed by RM
-L3 and RM-L10) result in automatic diversion of blowdown flow to the nuclear blowdown holdup tank. Under such conditions, samples from each steam generator blowdown stream are analyzed to determine the source of the radioactivity. Once the source has been determined, the blowdown from the affected steam generator may be processed separately while blowdown from the remaining steam generators may continue to be discharged. If the faulty steam generator cannot be satisfactorily isolated, total blowdown flow continues to be directed to the nuclear blowdown holdup tank.
A nuclear blowdown holdup tank pump starts at a preset holdup tank level to deliver tank contents to the inlet filter, demineralizers, post filter and thence to the main condenser. Detection of abnormally high activity by RM
-L7 downstream of the post filter results in automatic termination of flow to the condenser or through the alternate path to the penstocks of the Fairfield Pump Storage Facility. This flow is then directed to the nuclear blowdown monitor tank.
- 3. Startup During plant startup and subsequent restarts, steam generator blowdown, up to the design flow rate, is used for removal of accumulated deposits from the steam generators and to bring steam generator water chemistry within recommended limits. The cooled steam generator blowdown fluid may be discharged through the circulating water discharge to Monticello Reservoir.
During these operations, however, the steam generator blowdown fluid may contain high concentrations of corrosion products in the form of iron oxides.
Should the concentrations of these impurities exceed acceptable limits, the blowdown fluid is routed to the alum sludge lagoon through the clarifier blowdown sump for reduction of suspended solids content prior to discharge.
- 4. Cold Shutdown and Refueling During cold shutdown and refueling the steam generator wet layup system skid may be attached, by flexible hoses, between the blowdown system and the Emergency Feedwater System. The skid takes suction from blowdown and returns water to the steam generators via the turbine
-driven emergency feedwater pump header. The Steam Generator Wet Layup System may be used only during modes 5 and 6.
It must be isolated and disconnected before entering mode 4.
The blowdown and Emergency Feedwater System valves may be used to direct wet layup recirculation to any of the three steam generators, allowing one or more to be maintained in layup with one or more others open for maintenance.
10.4-32 Reformatted November 2017 Operation of the steam generator wet layup skid equipment is local and manual.
10.4.8.2.3 Radiological Considerations Annual release quantities and expected doses to individuals at or beyond the site boundary are discussed in Section 11.2. Since heat exchangers are installed in the system to provide for cooling the blowdown fluid and to prevent flashing, negligible gaseous release is expected to result from this system. Process and effluent monitoring and sampling are discussed in Section 11.4.
10.4.8.3 Safety Evaluation Steam generator blowdown flow is automatically terminated under the following conditions:
- 1. Receipt of a containment isolation signal.
- 2. Activation of the Emergency Feedwater System.
For 1, above, a containment isolation signal (S signal) is received which closes the steam generator blowdown containment isolation valves. For 2, above, a signal indicating emergency feedwater pump start is received resulting in closure of the steam generator blowdown containment isolation valves. The closure of valves resulting from 2, above, may be manually overridden, provided that plant and personnel safety requirements have been satisfied.
The Steam Generator Blowdown System is non
-nuclear safety class and quality related class, except for that portion of the system inside the Reactor Building and up to the containment isolation valve, and is not required to function under accident conditions.
Termination of steam generator blowdown may be accomplished manually. If the Nuclear Blowdown Processing System is operating at the time steam generator blowdown is terminated, the nuclear blowdown holdup tank level controller stops the pump when holdup tank level reaches the low level setpoint. Thus, the system is isolated. Section 10.3.5 provides more detail concerning secondary side water chemistry.
Safety considerations directly associated with the steam generators are discussed in Section 5.5.2.
Since radioactive materials are concentrated in filters and demineralizers, radiation shielding is provided to protect personnel from these potential hazards.
99-01 RN 04-026 RN 01-082 10.4-33 Reformatted November 2017 10.4.8.4 Tests and Inspections Steam generator tests and inspections are discussed in Section 5.5.2. No special maintenance is required for Steam Generator Blowdown System components. Equipment and piping is periodically subjected to visual examination for evidence of leakage, corrosion, proper support bolting, wear points, and electrical arcing or burning.
Active components, including manual valves and controls are operated periodically to ensure availability when required.
10.4.8.5 Instrumentation Applications The following instrumentation is shown schematically on Figures 10.4
-13 through 10.4-15 and is provided to permit the operator to evaluate major equipment performance and to provide a performance record:
- 1. Pressure indicators, transmitters, and switches.
- 2. Flow indicators, controllers, recorders, switches, and transmitters.
- 3. Level indicators, transmitters, controllers, and switches.
- 4. Temperature indicators, controllers, and switches.
- 5. Conductivity analyzers, indicators, and switches.
- 6. Analyzers, indicators, and switches for pH. 7. Engineered safety features monitor lights, located on the main control board, for the containment isolation valves (see Section 7.5 for detailed description).
- 8. Radiation monitors.
10.4.8.5.1 Temperature Control Steam generator blowdown temperature reduction is controlled by regulating the cooling water flow through the heat exchangers. The blowdown temperature is controlled below saturation to preclude flashing.
Temperature protection is provided for the demineralizers by a temperature switch located on the discharge header of the blowdown holdup tank transfer pumps. At high temperature, an alarm is actuated and the demineralizer inlet valves are automatically closed. Additional temperature switches actuate alarms upon detection of high blowdown heat exchanger effluent temperature.
10.4-34 Reformatted November 2017 10.4.8.5.2 Flow Control The hydraulic design of the blowdown piping provides for minimal pressure drop up to the blowdown control valves, downstream of the respective heat exchangers. Each blowdown control valve is designed to regulate blowdown flow and thus maintains a relatively constant downstream pressure of approximately 40 psig.
Flow indicating transmitters provide electronic inputs for high and low blowdown flow and blowdown flow control valve closure upon detection of high flow and to a controller to regulate blowdown pressure control valves: Electronic hand controllers are provided to permit adjustment of individual blowdown flows through the respective flow control valves.
10.4.8.5.3 Level Control The blowdown holdup tank level transmitter provides an electronic input for high and low level alarms, dual level pump actuation and low level pump trip.
The monitor tank level transmitter provides an electronic input for high and low level alarms, low level pump trip, and low level closure of the tank discharge valve.
The spent resin storage tank level transmitter provides an electronic input for high and low level alarms and low level pump trip.
10.4.9 EMERGENCY FEEDWATER SYSTEM 10.4.9.1 Design Bases The Emergency Feedwater System is required to deliver sufficient feedwater to the steam generators for cooldown upon loss of the normal feedwater supply and during a ATWS (Anticipated Transient Without Scram) event. The Emergency Feedwater System is used, additionally, to supply feedwater to the steam generators during startup, shutdown, and layup operations. Emergency feedwater pump starting is automatic. The Emergency Feedwater System operates in conjunction with the Turbine Bypass System, if available, or the main steam power relief valves and safety valves, to remove thermal energy from the steam generators.
The system is designed to automatically deliver feedwater, at a minimum total flow of 380 gpm, to at least 2 steam generators pressurized to 1211 psig. There is sufficient redundancy to establish this flow while sustaining a single active failure in the system in the short term or a single active or passive failure in the long term. The Emergency Feedwater System operates until the Residual Heat Removal (RHR) System can be placed in operation. The RHR system is started when reactor coolant pressure and temperature are approximately 400 psig and less than 350°F, respectively.
Corresponding steam generator shell side pressure is approximately 125 psia. This
pressure and temperature condition represents the lower limit of Emergency Feedwater System functional requirements as long as the reactor coolant pumps are operating.
RN 01-082 98-01 99-01 10.4-35 Reformatted November 2017 When forced circulation from the reactor coolant pumps is not available, Emergency Feedwater System operation is required down to a main steam pressure of 100 psia. This corresponds to a reactor coolant cold leg temperature of 325°F and a hot leg temperature of 350°F. The primary coolant temperature differential is required in order to maintain a density gradient to drive natural circulation of primary coolant, in the absence of reactor coolant pump operation.
Sufficient feedwater is available under emergency conditions to bring the plant to a safe shutdown condition. Assuming prior plant operation at engineered safety design rating (ESDR) of 2900 MWt in the core, the minimum required usable volume for the condensate storage tank is 158,570 gallons based on maintaining the plant at hot standby conditions for 11 hours1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br />. This volume also satisfies the minimum required volume to cool down the plant to hot shutdown conditions assuming the plant is maintained at hot standby for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and then cooled down to hot shutdown in 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
The condensate storage tank is a Safety Class 2b tank. The Service Water System provides an additional safety class backup source of emergency feedwater. Both service water loops can supply the Emergency Feedwater System if required.
System components are classified Safety Class 2a or 2b, except as noted on the system diagram, Figure 10.4
-16. Pressure retaining components are designed, fabricated, tested and inspected in accordance with the ASME Code,Section III [5], Classes 2 and 3 as applicable. Normal operating and design conditions are tabulated on Figure 10.4-16. Design upset condition is considered to be the shutoff head of the pumps and is expected to occur less than 1% of the time.
Any two emergency feedwater pumps operating together are designed to deliver a total of 380 gpm of feedwater distributed between 2 steam intact generators at pressures of 1211 psig, while also feeding the faulted steam generator which has flow passively limited by the cavitating venturi in the faulted loop. Any one emergency feedwater pump is designed to deliver 400 gpm total to all three steam generators at a pressure of 1211 psig during the non
-faulted event. Pump suction is from the Safety Class 2b condensate storage tank, or, if this source is not available, from the Service Water System. Although the condensate storage tank is used for normal plant makeup, a reserve is maintained for emergency feedwater purposes. (See Section 9.2.6.1).
This reserve is 160,054 gallons, based on the physical configuration of the tank from the bottom of the condensate to condenser nozzle to the top of the emergency feedwater suction nozzle. The actual usable amount of this reserve, however, is dependent on the instrument setpoints of the automatic switchover controls to the backup Service Water supply. The design, with automatic switchover to Service Water occurring prior to full utilization of the dedicated inventory, satisfies safe shutdown requirements. It is considered that full utilization of the dedicated inventory of condensate quality water is highly desirable from a commercial risk viewpoint, but is not absolutely required for safe shutdown as long as a redundant safety class alternate source is available.
02-01 99-01 99-01 RN 12-030 10.4-36 Reformatted November 2017 The Emergency Feedwater System is required for plant startup. Fill and maintenance of steam generator water level is accomplished by manual control of feedwater flow rates from the Control Room. The flow rate to each steam generator is individually adjusted as required in response to the Control Room steam generator water level indication. After normal steam generator water level is reached, flow rates are adjusted as required. A sampling connection is supplied on the electric motor driven emergency feedwater pump recirculation lines for oxygen level tests.
After reactor criticality is achieved, a limited amount of steam may be withdrawn from the steam generators for steam line warmup and other startup steam uses. The amount of steam that may be withdrawn is limited to the ability of the emergency feedwater pumps to maintain steam generator water level. Electric motor driven emergency feedwater pump head/flow characteristics result in flow rates of up to approximately 255 gpm per steam generator at hot standby conditions. Based on a nominal steam generator blowdown rate of 50 gpm per steam generator, (equivalent cold volume) approximately 307,488 lb/hr of steam may be withdrawn from the steam generators with 2 motor driven pumps operating. This corresponds to a nominal 3% plant load condition. The Main Feedwater System must be operated at loads which exceed the capacity of the Emergency Feedwater System.
If a loss of steam generator water level incident occurs during startup, after the reactor becomes critical, Emergency Feedwater System controls operate automatically. This action enhances proper system operation for plant shutdown. Seismic and quality group classifications for components in this system are discussed in detail in Section 3.2. Environmental conditions are discussed in Section 3.11.
10.4.9.2 System Description The Emergency Feedwater System includes 2 electric motor driven emergency feedwater pumps, 1 turbine driven emergency feedwater pump, the condensate storage tank, necessary piping, valves, instrumentation, and controls. The Emergency Feedwater System is essential to safety. The system is designed such that no single failure prevents delivery of the minimum feedwater flow to at least 2 steam generators while passively limiting flow to a postulated secondary side line break by virtue of cavitating venturis installed in the piping to each of the three steam generators (one cavitating venturi per steam generator). Pump and turbine bearings are cooled by the pumped emergency feedwater, thereby making pump operation independent of plant cooling systems. The quick start, steam turbine driven emergency feedwater pump is supplied with steam from the Main Steam System and is designed to operate without air or electrical power. Both motor driven emergency feedwater pumps are provided with a mechanical
-type, automatic recirculation control valves (ARC), which provides for pump protection for low flows and maximizes flow to the steam generators by automatically closing the recirculation line once the pumps' minimum flow requirement is met.
Conversely, the turbine driven pump utilizes a fixed-restriction minimum
-flow system , which provides for continuous recirculation and overall system diversity; this fixed RN 12-030 RN 12-030 RN 12-030 RN 12-030 10.4-37 Reformatted November 2017 recirculation flow design feature is made possible due to the performance margins inherent in the turbine driven pump. Each pump motor is supplied from a separate, independent Class 1E electric system bus. Complete physical separation is followed throughout for control and instrumentation systems. The required instrumentation and control are powered from separate and independent vital buses.
The steam supply to the turbine driven emergency feedwater pump consists of connections to the safety class sections of 2 main steam lines upstream of the main steam isolation valves. Two (2) connections are provided to obtain redundancy of supply in the event of a main steam line break. Each connection is provided with a remote manual motor operated gate valve and a check valve for positive isolation in the event of a main steam break. In the common line to the pump turbine, a normally closed, fail open steam inlet valve is provided. This valve has slow opening characteristics to minimize shock to the turbine during automatic startup. This line then connects to a turbine trip and throttle valve which is part of the turbine package. The turbine discharge steam exhausts to atmosphere through a roof vent. Vent piping is safety-related since, if it were blocked, pump turbine operation would be affected.
The emergency feedwater pumps take suction from the condensate storage tank.
There is an outlet valve and an outlet bypass valve in parallel at the EFW suction outlet in the tank. These valves are 10 inch manual valves feeding the 10 inch header and are locked open to prevent undesired isolation of the EFW system from its primary supply of water. Each pump draws from a common header through a locked open isolation valve and a check valve. The redundant backup source of supply is the Service Water System. The A service water loop can supply the A electric motor drive emergency feedwater pump and the turbine driven emergency feedwater pump. The B service water loop can also supply the turbine drive emergency feedwater pump and the B electric motor driven emergency feedwater pump. Suction lines to each pump from each service water loop have normally closed remote manual, motor operated isolation valves. These valves are automatically opened on low pressure in the emergency feedwater pump suction header from the condensate storage tank. The plant can operate indefinitely, if required, without normal feedwater. The Emergency Feedwater System can take suction from the Service Water System for an indefinite period of time.
There are 2 emergency feedwater headers supplying each steam generator, 1 header from the electric motor driven emergency feedwater pumps and one header from the turbine driven emergency feedwater pump. These headers join downstream of the flow control valves into one line for each steam generator. Each of the three parallel lines proceed through, a flow-limiting cavitating venturi, a containment isolation valve and a containment penetration to its respective steam generator. The containment isolation valve for each line is an air
-piston assisted, hinged check valve that allows forward passage of emergency feedwater flow but closes to prevent reverse flow.
Each emergency feedwater pump discharge is provided with a check valve and locally operated isolation valve. These valves prevent backflow through an emergency 99-01 RN 12-030 10.4-38 Reformatted November 2017 feedwater pump and permit maintenance of a pump and/or check valve. Two (2) sets of normally open isolation valves and normally open, pneumatically operated, flow control valves, designed to fail open upon loss of control signal or air, are provided on each line to each steam generator. One (1) set control flow from the electric motor driven emergency feedwater pumps; the other, flow from the turbine driven emergency feedwater pump. Remote manual control of the flow control valves from the control room and CREP is provided, as well as provision for local manual operation. Safety class air accumulators are provided for the pneumatically operated valves. These accumulators have sufficient capacity to permit remote valve closure for isolation of a secondary system break. The air operated nonreturn valve functions as a containment isolation valve to prevent back flow in the event of a pipe break on the pump side of the valve. A connection is provided for steam generator wet layup during cold shutdown conditions, using the steam generator wet layup skid of the blowdown system.
(Section 10.4.8) The EF system also has an automatic detection and isolation system in the event of an EF system pipe break between the automatic isolation valves and the cativating venturis. 10.4.9.3 Safety Evaluation Normal Emergency Feedwater System conditions encompass the automatic, startup, operating, shutdown and testing modes. During the automatic mode, the system is aligned and set for automatic startup upon receipt of a signal. During the other modes 1 or 2 emergency feedwater pumps may be operating.
During normal plant operation the Emergency Feedwater System is idle. Controls for the system are set for automatic operation to allow for quick system start if necessary.
The electric motor driven emergency feedwater pumps start automatically upon receipt of any of the following signals:
- 1. Two (2) out of 3 low
-low steam generator level signals from any 1 of the 3 steam generators.
- 2. Trip of all 3 main feedwater pumps.
- 3. Engineered safety features loading sequence (under voltage on 1E bus and/or safety injection signal). 4. The ATWS (Anticipated Transient Without Scram) Mitigation System Actuation Circuitry (AMSAC) starts the motor driven pumps on low
-low level in 2 out of 3 steam generators.
The turbine driven emergency feedwater pump starts automatically upon receipt of any of the following signals:
98-01 RN 12-030 10.4-39 Reformatted November 2017
- 1. Two (2) out of 3 low
-low steam generator level signals from any 2 steam generators.
- 2. Under voltage on diesel buses.
- 3. The ATWS (Anticipated Transient Without Scram) Mitigation System Actuation Circuitry (AMSAC) starts the turbine driven pump on low
-low level in 2 out of 3 steam generators.
The turbine driven emergency feedwater pump and the parts of the system necessary for its operation are designed to operate under loss of electrical power and loss of compressed air conditions. Flow control valves fail in the open position and are normally open. Root valves in the main steam branch lines to the emergency feedwater pump drive turbine are left open during normal plant operations. When either root valve is closed, it is annunciated in the control room.
The essential controls, valve operators, and other supporting systems associated with the turbine driven emergency feedwater pump are independent from a
-c power. The lube oil cooler receives cooling water from the pump discharge.
Subsequent to a start signal, the Emergency Feedwater System, automatically delivers no less than a total flow of 380 gpm to both intact steam generators assuming a secondary line break. For non
-faulted conditions no less than a total of 400 gpm to all three steam generators can be supplied.
In the event that a secondary break results in a depressurized steam generator, the Emergency Feedwater System automatically (passively) limits the flow to the affected steam generator via cavitating venturis, thus resulting in more flow to the intact steam generators and less to the faulted steam generator. Also, since flow is immediately limited to the faulted steam generator, less mass and energy will be produced by the faulted steam generator before operator action is required to manually isolate the faulted steam generator. Thus, the cavitating venturis ensure sufficient flow is directed to the intact steam generators and limits flow
to the faulted steam generator to ensure the design pressure of containment is not exceeded. Following an automatic startup signal, the operator adjusts flow rates to
maintain steam generator water level while the plant is shut down or held at the hot standby condition.
The following operator actions are required to limit generation of mass and energy from the faulted steam generator following a secondary side break:
After 10 minutes:
- 1. Determine which steam generator is faulted.
- 2. Manually terminate emergency feedwater flow on the line associated with the break from the control room if possible by closing both parallel flow
-control valves leading to the faulted steam generator.
- 3. Adjust flow rates to maintain intact steam generator water levels.
98-01 RN 12-030 RN 96-67 10.4-40 Reformatted November 2017
- 4. Monitor condensate storage tank water level and provide makeup, if available, or shift alignment to the service water supply before the condensate storage tank inventory is expended.
Within the next 20 minutes:
- 1. Close any flow control valve supplying a faulted steam generator if it failed to close after the first 10 minutes, from the control room or locally.
- 2. Close at least one additional isolation valve in series with each of the two, closed, parallel flow
-control valves leading to the faulted steam generator to reduce the possibility of emergency feedwater leak
-by. During the 30 minute period, flow to the affected steam generator is limited by the cavitating venturi, if one or both isolation valves failed to close from the control room. It is important to note that to ensure acceptable results from the feedwater line break event (FSAR Section 15.4.2.2), the manual actions described above are not required; the above described actions are only concerned with containment pressure
-and-temperature analysis and for determination of environmental conditions due to steam line breaks outside of containment.
The operator in the Control Room is provided with position indication for the six emergency feedwater isolation valves. In addition, isolation valve status is included in the ESF monitoring equipment on the main control board.
A summary failure analysis of the Emergency Feedwater System is presented by Table 10.4-8 for a secondary pipe break with a simultaneous loss of non
-class 1E electrical power. A more detailed failure analysis, covering deterministic and probabilistic considerations, is documented in design calculations maintained by the PRA group.
Failure to automatically isolate emergency feedwater to the affected SG is an important consideration within two secondary pipe break analyses. For secondary side pipe breaks inside containment (FSAR Section 6.2), operator action at 30 minutes is credited to isolate emergency feedwater to the affected SG. Local or remote operator action within 30 minutes is required to prevent overpressurizing the containment. Secondly, for secondary side pipe breaks outside containment (FSAR Section 3.11.2.2.2.2), credit is taken for operator action at 10 minutes to isolate emergency feedwater to the affected SG. Since the harsh environment will limit local manual actions, operator action from the control room is required for secondary pipe breaks outside containment to preserve environment conditions for equipment qualification.
Operator action is required within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the secondary side line break to visually inspect Emergency Feedwater System piping for passive failure.
If a pipe break should occur in the Intermediate Building, alarm and control devices act to prevent flooding at safety
-related equipment on the floors. Section 7.6.5.1.2 outlines the details of the provisions for leak detection.
RN 96-67 RN 12-030 02-01 98-053 RN 12-030 RN 98-053 02-01 RN 12-030 RN 12-030 10.4-41 Reformatted November 2017 The Emergency Feedwater System is used to bring the plant to a sufficiently cold condition to permit Residual Heat Removal (RHR) System operation. The plant can operate indefinitely, if required, without normal feedwater. The Emergency Feedwater System can take suction from the Service Water System for an indefinite period.
Table 10.4
-8 presents an Emergency Feedwater System failure analysis which addresses the consequences of various single active failures within the system i n conjunction with a secondary side pipe break and a simultaneous loss of non
-Class 1E electrical power. These conditions are considered to establish the limiting conditions for Emergency Feedwater System design. In addition, the emergency feedwater piping has been laid out to minimize water hammer occurrences induced by the piping system.
10.4.9.4 Inspection and Testing Requirements Inservice functional testing is performed by manual startup of the emergency feedwater pumps. Pumps and valves may be tested while the plant is in operation.
The actuation circuitry of the service water
-to-emergency feedwater cross connect valves is periodically tested during normal power operations. Stroke testing of these motor-operated valves is performed dur ing cold shutdown to preclude contamination of the steam generators.
To avoid injection of cold water into the steam generators during normal plant operation, the flow control valves associated with the pump under test (motor driven or turbine driven) are closed during the test.
Periodic system and component checks and inspections are performed as specified by the applicable ASME Code, prescribed under 10CFR50.55a.
10.4.9.5 Instrumentation Requirements Emergency Feedwater System instrumentation provides the necessary inputs for control, operation, and performance/status monitoring of the system.
Those devices (indicators, switches, alarms, computer monitoring, etc.) available to the operator in the Control Room are shown schematically on Figure 10.4
-16. In addition, indicators and/or controls are also located on the control room evacuation panel, local panels, and near the components.
10.4.9.5.1 Pressure Measurement
- 1. Pressure Transmitters Pressure transmitters are provided in the common feed line to each steam generator for control room indication.
In addition to the above pressure transmitters, 4 pressure transmitters are provided in the emergency feedwater pump suction header from the condensate storage RN 98-053 RN 04-012 RN 11-022 10.4-42 Reformatted November 2017 tank. The output from these transmitters is arranged in a 2 out of 4 logic to automatically open the cross connect valves to the Service Water System (XVG-1037A-EF, XVG-1037B-EF, XVG-1001A-EF, XVG-1001B-EF, XVG-1002-EF, XVG-1008-EF) on low emergency feedwater pump suction header pressure. 2. Pressure Switches Pressure switches located in the suction line to each pump provide contacts for a low pressure alarm.
- 3. Pressure Indicators Pressure indicators are provided to monitor the availability of a water supply for each pump and to meet the inservice testing requirements for the pumps.
10.4.9.5.2 Level Measurement Level Transmitters Redundant level transmitters located on the condensate storage tank provide signals for low level alarms, computer inputs, and Control Room indicators (for post accident monitoring). In addition, the transmitters provide nonredundant signals for level indication at the panel supplied with the cycle makeup treatment plant and the control room evacuation panel.
10.4.9.5.3 Flow Measurement Flow transmitters provide signals for alarms and redundant safety grade flow indication in the Control Room. Flow transmitters also provide signals for computer input, and for interlocks which automatically close the emergency feedwater flow control valves in case of a break in the emergency feedwater system between the flow control valves and the cavitating venturis. The emergency feedwater control valves are manually controlled from the Control Room or the control room evacuation panel for startup, shutdown and testing modes. Whenever an emergency feedwater control valve is in manual control and receives a signal indicative of an accident condition, the valve is automatically tripped open. During normal power operation, the emergency feedwater control valves are in the open position ready for automatic start of the emergency feedwater pumps. The control valves will remain open until throttled or closed by the operator or automatically closed by a high flow signal indicative of a break in the emergency feedwater system between the flow control valves and the cavitating venturis. Closure of the 2 emergency feedwater control valves terminates emergency feedwater flow only into the faulted steam generator loop.
Due to the passive flow limitation of the cavitating venturis, the emergency feedwater control valves will not automatically close due to a faulted steam generator and will rely on operator action to isolate the faulted loop within 10 minutes.
RN 12-030 RN 12-030 10.4-43 Reformatted November 2017 For each emergency feedwater control valve (FV
-3531, FV-3541, FV-3551, FV-3536 , FV-3546, FV-3556), position indicating design provisions include the following:
- 1. Visual indication in the main control room by means of an ESF monitor light that will be "bright" when the valve is not open. Section 7.5.4 provides a more detailed explanation of the operation of the ESF monitor lights. An alarm will be annunciated via a common monitor light alarm if an emergency feedwater control valve is not open. This grouping highlights a valve not properly lined up. This light is energized from an ESF monitor light supply different from the valve control power and actuated by a valve limit switch. In addition to this visual position information, there are also red (open) and green (closed) position indicating lights at the control switch for each valve. These lights are actuated by valve limit switches and are powered by valve control power.
- 2. Audible and visual alarm annunciator points will be activated whenever an emergency feedwater control valve control switch is not in the auto position. The alarm activated by the control switch will be recycled by a timer at approximately 60 minute intervals to remind the operator of the improper valve line up. Both the alarm reflash annunciator point and the timer will be energized separately from the valve control power.
10.4.9.5.4 Speed Measurement A speed transducer, supplied with the turbine driven emergency feedwater pump turbine, provides signals for Control Room indication.
10.4.9.5.5 Special Instrumentation The main control board ESF monitor lights (see Section 7.5 for a more detailed explanation) provide an easily recognizable indication of the status of essential components and equipment. Included among the monitor lights for this system are status (position) indication of the flow control valves, the motor driven pumps, and the valve that admits steam to the turbine driven emergency feedwater pump.
An alarm is actuated if either control switch for the valve that admits steam to the turbine driven emergency feedwater pump is in the close position. The alarms ensure proper control switch alignment for normal operations. Switch covers are provided for these switches to prevent inadvertent operator action.
The emergency feedwater flow to each steam generator and condensate storage tank level are part of the post accident monitoring instrumentation (see Section 7.5 for a more detailed explanation).
99-01 10.4-44 Reformatted November 2017 10.4.9.5.6 Qualifications Sections 3.10, 3.11, and 7.1 outline the qualifications and diversity of the instrumentation utilized in this system.
10.4.10 TURBINE BUILDING CLOSED CYCLE COOLING WATER SYSTEM The Turbine Building Closed Cycle Cooling Water System provides cooling water to components associated with the steam and power conversion system. The energy is dissipated to the atmosphere by a wet surface industrial cooling wate
- r. 10.4.10.1 Design Basis The Turbine Building Closed Cycle Cooling Water System supplies non
-nuclear safety class cooling water to the following components:
- 1. Turbine oil coolers
- 2. Hydrogen coolers
- 3. Exciter air cooler
- 4. Stator coolers
- 5. Main condenser vacuum pump coolers
- 6. Auxiliary condenser vacuum pump coolers
- 7. Instrument/service air compressors
- 8. Non-nuclear sample coolers
- 9. Non-nuclear sample chiller
- 10. Feedwater pump and turbine oil coolers
- 11. Feedwater booster pump mechanical seals and oil coolers
- 12. EHC oil coolers
- 13. Isophase bus duct coolers
- 14. Condensate pump seal coolers
- 15. Condensate demineralizer system air compressor Major design parameters for the cooling water system pumps and the cooling tower are presented in Table 10.4-9. 02-01 RN 10-018 10.4-45 Reformatted November 2017 System piping and valves are designed in accordance with the applicable ANSI industry standards B31.1 [1] and B16.5 [2] respectively. Hydrogen coolers, stator coolers, exciter air cooler, and turbine oil coolers are designed in accordance with the ASME Code,Section VIII [6], Division 1. Pumps are designed in accordance with Hydraulic Institute Standards.[9] The system is sized to ensure adequate heat removal based on 95° F nominal cooling tower water outlet temperature.
10.4.10.2 System Description The Turbine Building Closed Cycle Cooling Water System components include a wet surface industrial cooling tower, two 100% capacity tower spray pumps, 4 cooling tower fans, two 100% capacity closed cycle cooling pumps, two 100% capacity closed cycle cooling booster pumps, various equipment coolers, and a head tank. Chemical injection and blowdown are provided to maintain the quality of the spray water.
Under normal operation, 1 of the 2 cooling water pumps circulates treated water through the cooling tower coils transferring the heat removed from the various components to the spray water and then to the atmosphere by evaporation of the spray water in the air stream produced by cooling tower fans. The dispersant and anti
-fouling chemicals added to the cooling tower raw water are sufficiently diluted to ensure negligible effect on the environment. Cooling tower effluents, including salt drift and chemical discharges, will have negligible effect on plant structures and systems.
In the event of loss of the operating closed cycle pump while a
-c power is available, the non-operating closed cycle pump starts automatically on detection of a pressure drop in the pump header.
The head tank located at the highest point in the system provides makeup and storage for thermal volume changes.
02-01 RN 10-018 RN 10-018 10.4-46 Reformatted November 2017 10.4.10.3 Safety Evaluation The Turbine Building Closed Cycle Cooling Water System is independent of the plant emergency cooling facilities. This system is not required for reactor protection nor for safe shutdown of the nuclear portion of the plant and is therefore classified as
non-nuclear safety class, non
-Seismic Category 1. Failure or malfunction of any system component will not affect the ability of the plant to achieve or maintain shutdown conditions.
A postulated failure in the Turbine Building Closed Cycle Cooling Water System inside the Turbine Building is bounded by the postulated failure of an expansion joint in the Circulating Water System piping as discussed in Section 10.4.5.3. Failure of the Turbine Building Closed Cycle Cooling Water System, having a limited volume of water which could be released into the turbine building, results in a lower flood level than the postulated event where circulating water is released through an expansion joint failure until the pump isolation valve closed.
The case of postulated missiles resulting from a broken cooling tower fiberglass fan blade is enveloped by the tornado missile spectrum applicable to the design of Seismic Category 1 structures.
10.4.10.4 Tests and Inspection Testing of the Turbine Building Closed Cycle Cooling Water System is limited to that normally provided for non
-safety related systems and includes:
- 1. Hot functional testing.
- 2. Normal, operational checking and routine maintenance of the system.
10.4.10.5 Instrumentation System instrumentation to permit operator evaluation of equipment performance and to provide a performance record includes:
- 1. Pressure indicators, switches and test connections.
- 2. Flow indicators.
- 3. Level switches.
- 4. Temperature indicators and test connections.
- 5. Distributed Control System (DCS) for controlling and monitoring including operator interface.
10.4-47 Reformatted November 2017 10.4.11 REFERENCES
- 1. American National Standards Institute, "Power Piping," ANSI B31.1, 1967, Addenda through 1972.
- 2. American National Standards Institute, "Steel Pipe Flanges, flanged Valves and Fittings," ANSI B16.5, 1968.
- 3. U. S. Nuclear Regulatory Commission, "Calculation of Releases of Radioactive Materials in Gaseous and Liquid Effluents from Pressurized Water Reactors,"
NUREG-0017, April, 1976.
- 4. Heat Exchange Institute, "Standards for Steam Surface Condensers," Sixth Edition, 1970.
- 5. ASME Boiler and Pressure Vessel Code,Section III.
- 6. ASME Boiler and Pressure Vessel Code,Section VIII, Division 1.
- 7. Heat Exchange Institute, "Standard for Closed Feedwater Heaters," Second Edition, 1974.
- 8. ASME Boiler and Pressure Vessel Code,Section XI.
- 9. Hydraulic Institute Standards, for Centrifugal, Rotary, and Reciprocating Pumps.
- 10. IEEE - Standard 382
-1972, "Type Test of Class 1 Electric Valve Operators." 11. Regulatory Guide 1.48, Rev. 0, "Design Limits and Leading Combinations for Seismic Category 1 Fluid System Components." 12. GAI Report No. 2203, "Emergency Feedwater System Reliability Assessment." 02-01 10.4-48 Reformatted November 2017 TABLE 10.4
-1 CONDENSER DESIGN CAPACITIES Low Pressure Shell High Pressure Shell Size, ft 2 300,000 300,000 Shell Side Steam In, lbs/hr 3.43 x 10 6 3.43 x 10 6 U Service BTU/hr
-ft 2- F 539.1 559.1 Cleanliness factor, %
90 90 Saturation Temperature, F 103.22 114.02 Log Mean Temperature Difference, F 19.52 18.33 Operating Pressure, in HgA 2.13 2.91 Oxygen Guarantee in Hotwell,* cc/liter 0.005 Total Calculated Duty, BTU/hr
~ 6,232 x 10 6 Tube Side Circulating Water Flow, gpm
~ 520,000 ~ 520,000 Water In, F 77 89.1 Water Out, F 89.1 101 Number of Passes One One Pressure Drop, ft of water
~ 12.7 ~ 12.4 Velocity, ft/sec
~ 8.030 ~ 8.030
- At turbine loads >50%.
02-01 02-01 10.4-49 Reformatted November 2017 TABLE 10.4
-1 (Continued)
CONDENSER DESIGN CAPACITIES Auxiliary Condensers Each Shell Quantity 3 Size ft 2 5,122 Shell Side (each condenser)
Steam In, lb/hr 64,839 U Service BTU/hr
-ft 2- F 456 Cleanliness Factor, %
90 Saturation Temperature, F 118.00 Log Mean Temperature Difference, F 26.96 Operating Pressure, in HgA 3.2 Tube Side (each condenser) Circulating Water Flow, gpm 5,000 Water In, F 77 Water Out, F 101.4 Number of Passes 3 Pressure Drop, ft of water 12.6 Velocity, ft/sec 6.4 at 60 F Main Condenser Vacuum Pumps Capacity, Free Dry Air, lb/hr (scfm) 90 (20), each pump Capacity, Associated Vapor, lb/hr 198, each pump Total Capacity, Air
-Vapor Mixture, lb/hr 288, each pump Auxiliary Condenser Vacuum Pumps Capacity, Free Dry Air, lb/hr (scfm) 67.5 (15), each pump Capacity, Associated Vapor, lb/hr 147.5, each pump Total Capacity, Air
-Vapor Mixture, lb/hr 215.0, each pump 02-01 10.4-50 Reformatted November 2017 TABLE 10.4
-2 TURBINE BYPASS VALVE SETPOINTS Applicable Valves Condition Device Setpoint Reference FSAR Figure All Lo-Lo Tavg SSPS (K631) 552 F 10.4-4b Condenser Dumps Only Condenser Pressure PY/3006A 5" HgA 10.4-4b Condenser Dumps Only Condenser Pressure PY/3016A 5" HgA 10.4-4b All Turbine Impulse Chamber Pressure PB447A 10% of load 10.4-4b All Turbine Impulse Chamber Pressure PB447B 50% of load 10.4-4b Condenser Dumps Only Hi Tavg Load Rejection Steam Dump TB408F Hi 1-5.7 F Hi 2-16.9F 10.4-4b Atmospheric Relief and Power Relief Only Hi Tavg Load Rejection Steam Dump TB408P Hi 3-22.4 F Hi 4-28F 10.4-4b Condenser Dumps Only Hi Tavg Turbine Trip Steam Dump TB408J Hi 1-7.6 F Hi 2-30.4F 10.4-4b Power Relief Valves Only Pressure Controller PC ** 1107 psia 10.4-4a Power Relief Valves Only Pressure Control TY-408R1 TY-408R2 77.7 to 100% (1) 10.4-4a Power Relief Valves Only Pressure Bistable PB *** 1148 psia inc.; reset at 1105 psia, dec.
10.4-4a Atmospheric Relief Valves Only Pressure Control TY-408Q1 TY-408Q2 57.7 to 77.7% (1) 10.4-4a Condenser Cooldown Valves Only Pressure Control TY-408N1 TY-408N2 0 to 14.4% (1) 10.4-4a 02-01 02-01 02-01 RN 04-003 RN 04-003 10.4-51 Reformatted November 2017 TABLE 10.4
-2 (Continued)
TURBINE BYPASS VALVE SETPOINTS Applicable Valves Condition Device Setpoint Reference FSAR Figure Condenser Dump Valves Only Pressure Control TY-408P1 TY-408P2 TY-408P3 14.4 to 57.7% (1) 10.4-4a IFV-2097-MB and IFV-2117-MB Only Valve Open Permit PY/3006B or PY/3016B 4.5" HgA 10.4-4a
(1) Operating bandwidth based on valve limitations. Percent of steam dump capacity
(~ 93.6% of rated steam flow), as outlined on Figure 7.2
-1, Sheet 10.
RN 04-003 02-01 RN 04-003 10.4-52 Reformatted November 2017 TABLE 10.4
-3 CIRCULATING WATER SYSTEM DESIGN PARAMETERS Traveling Screens Quantity 6 Type Through flow Screen Material 304 Stainless steel Screen Mesh Opening, in 3/8 Design Water Velocity, fps 0.75 (approach)
Capacity, gpm 95,000 @ 1.32 fps 120,000 @ 1.67 fps Circulating Water Pumps Quantity 3 Type Vertical, wet pit Total Dynamic Head, ft 40.5 Capacity, gpm
~178,000 Speed (XPP0006A/B/
C), rpm (297/294/294) Shutoff Head, ft 89 Horsepower 2250 Circulating Water Jockey Pump Quantity 1 Type Vertical, wet pit Total Dynamic Head, ft 38 Capacity, gpm 5000 Speed, rpm 690 Shutoff head, ft 50 Horsepower 75 02-01 RN 08-001 10.4-53 Reformatted November 2017 TABLE 10.4
-3 (Continued)
CIRCULATING WATER SYSTEM DESIGN PARAMETERS Lube Water Booster Pump Quantity 1 Type Vertical Total Dynamic Head, ft 150 Capacity, gpm 50 Speed, rpm 3500 Shutoff Head, ft 170 Horsepower 7.5 Screen Wash Pumps Quantity 2 Type Horizontal Total Dynamic Head, ft 250 Capacity, gpm 2000 Speed, rpm 1750 Shutoff Head, ft 280 Horsepower 200 02-01 10.4-54 Reformatted November 2017 TABLE 10.4
-3a WATER LEVEL VERSUS TIME FOR A POSTULATED CIRCULATING WATER SYSTEM EXPANSION JOINT FAILU RE Elevation (ft)
Time (sec) Event 390 0-5 Alarm in main condenser cleaning pit 400 46 Second alarm, trip of circulating water pumps 412 102 Amertap strainer pit over
-flows to turbine building floor 413 147 - 413.5 170 Circulating water pumps discharge valves close fully, flow stops
NOTE: Prior to pump discharge valve closure, water rise in the Turbine Building is approximately 16 in/min.
10.4-55 Reformatted November 2017 TABLE 10.4
-4 CONDENSATE SYSTEM EQUIPMENT PARAMETERS Condensate Pumps Quantity 3 Design capacity, gpm 9635 Design Total Dynamic Head, ft 605 Efficiency at Design Condition %
82 NPSH Required at Design Point, ft 18 Design Speed, rpm 1187 Shutoff Head, ft 775 Minimum Flow, gpm 1000 Motor Rated Horsepower, HP 2000 Normal Operating Point Conditions Total Dynamic Head, ft 630 Flow, gpm 9177 Horsepower, BHP 1800 Deaerator Quantity 1 Condensate, lb/hr 8,837,684 Temperature, F 300.3 Extraction Steam Flow, lb/hr 255,110 Pressure (at inlet), psia 107.9 Enthalpy, BTU/lb 1228.3 High Pressure Heater Drain, lb/hr 3,752,012 02-01 10.4-56 Reformatted November 2017 TABLE 10.4
-4 (Continued)
CONDENSATE SYSTEM EQUIPMENT PARAMETERS Capacity of Deaerator Storage Tank at Normal Water Level (5 ft above tank center line), gal 75,000 0 2 Content Guarantee, cm 3/liter 0.005 Vented Steam Flow (Predicted), lb/hr 300 Design Pressure, psig Full vacuum
- 116 Operating Pressure, psia 107.9 Feedwater Heaters Heater 4 Heaters 5 & 6 Quantity 2 2/2 Feedwater, lb/hr 4,418,842 (each) 4,418,842 (each)
Extraction Steam, lb/hr (each) 333,171 267,781/169,903 Drain, lb/hr Flow (from) each 333,171 608,974/887,700 Steam Pressure at Inlet, psia 71.5 21.8/5.87 Feedwater Inlet, F 227.5 164.1/115.1 Feedwater Outlet, F 300.3 227.5/164.1 Steam In, F 324.4 237.1/172.7 Drains Out, F 240.5 174.1/125.1 Drain Cooler approach, F 13 10/10 Terminal Difference, F 4.0 5/5 Total Heat Transferred, BTU/hr 326,994,308 281,480,235/
216,081,374 02-01 RN 06-041 10.4-57 Reformatted November 2017 TABLE 10.4
-5 FEEDWATER SYSTEM EQUIPMENT PARAMETERS Feedwater Booster Pumps Quantity 4 Configuration Horizontal, single stage, double suction, horizontal split, dual volute casing Operating* NPSH Required, ft 28 Operating* Total Dynamic Head, ft 565 Operating* Capacity, gpm 7200 Design NPSH Required, ft 29 Design Total Dynamic Head, ft 555 Design Capacity, gpm 7556 Design Shaft Horsepower Required, BHp 1150 Speed, rpm 1780 Feedwater Pumps Quantity 3 Configuration Horizontal, single state, double suction, diffuser type Operating* Capacity, gpm 9600 (each pump)
Operating* Total Dynamic Head, ft 2365 Operating* Speed, rpm 4550 Operating* Efficiency, %
87.5 Design Capacity, gpm 10,075 (each Pump)
Design Total Dynamic Head, ft 2585 Design Speed, rpm 4800 Maximum Shut Off Head, ft 4225 ( 6% at runout)
- At 100% Rated Power w/1% Blowdown 02-01 02-01 02-01 10.4-58 Reformatted November 2017 TABLE 10.4
-5 (Continued)
FEEDWATER SYSTEM EQUIPMENT PARAMETERS Feedwater Heaters Heaters 1A & 1B Heaters 2A & 2B Quantity 2 2 Type Horizontal, U
-tube, closed, with internal drains cooler Feedwater (In), lbs/hr; BTU/lb 6,429,057; 351.0 6,429,057; 308
.1 Steam, lbs/hr; BTU/lb 444,740; 1143.7 869,334; 586.0 Drains to Heater lbs/hr; BTU/lb 552,045; 531.4 1,006,672;362.5 Steam Pressure at Inlet, psia 408.1 205.6 Feedwater Inlet, F 376.1 335.1 Feedwater Outlet, F 441.0 376.1 Steam Inlet, F 456.6 393.0 Drains Out, F 388.1 347.6 Drain Cooler approach, F 12 12.5 Terminal Difference, F 5.6 8.0 Total Heat Transferred, BTU/hr 448,748,179 275,806,545 02-01 10.4-59 Reformatted November 2017 TABLE 10.4
-6 FEEDWATER SYSTEM FAILURE ANALYSIS Component Malfunction Comment Feedwater Booster Pump 1. Trip of one operating pump from normal operating scheme.
No effect.
- 2. Trip of one operating pump from beyond normal operating scheme. Limited power reduction in accordance with operating procedures.
Feedwater Pump
- 1. Trip of one operating pump from normal operating scheme.
Remaining feedwater pump(s) run out, no effect on NSSS.
- 2. Trip of one operating pump from beyond normal operating scheme. Reactor trip or runback in accordance with operating procedures.
Feedwater Flow Control Valve Valve fails closed.
Feedwater Isolation Valve Valve fails closed.
Feedwater Piping Postulated pipe rupture.
See Section 10.4.7.2.3.
10.4-60 Reformatted November 2017 TABLE 10.4
-7 STEAM GENERATOR BLOWDOWN SYSTEM COMPONENT DESIGN PARAMETERS Steam Generator Blowdown Heat Exchangers Quantity 3 Type Shell and tube Shell Side Tube Side Fluid Condensate Blowdown Design Pressure, psig 250 1185 Design Temperature, F 400 650 Inlet Temperature, F 106 557 Outlet Temperature, F 338 120 Flow, lb/hr 79,4 50 40,700 Material SA-515-70 SA-249-304 Effective Heat Transfer Area, ft 2 2082 Heat Duty, BTU/hr 18.5 x 10 6 Nuclear Blowdown Holdup Tank Quantity 1 Capacity, gal 13,000 Design Pressure Atmospheric Design Temperature, F 150 Materials Lined carbon steel Nuclear Blowdown Monitor Tank Quantity 1 Capacity, gal 5,000 Design Pressure Atmospheric Design Temperature, F 150 Material Type 304 stainless steel 99-01 02-01 99-01 02-01 02-01 10.4-61 Reformatted November 2017 TABLE 10.4
-7 (Continued)
STEAM GENERATOR BLOWDOWN SYSTEM COMPONENT DESIGN PARAMETERS Nuclear Blowdown Holdup Tank Pumps Quantity 2 Type Canned motor, centrifugal Capacity, gpm (Includes 50 gpm of recirc flow) 300 Total Developed Head, ft 325 Material Wetted parts
- type 316 stainless steel Nuclear Blowdown Monitor Tank Pump Quantity 1 Type Canned motor, centrifugal Capacity, gpm 250 Total Developed Head, ft 250 Material Wetted parts
- type 316 stainless steel Nuclear Blowdown Demineralizer Inlet Filter Quantity 1 Design Flow, gpm 250 Design Pressure, psig 150 Design Temperature, F 150 Pressure Drop Clean, psi 5 Dirty, psi 20 Particulate Retention, microns absolute 20 Vessel Material Type 304 stainless steel RN 05-008 02-01 02-01 10.4-62 Reformatted November 2017 TABLE 10.4
-7 (Continued)
STEAM GENERATOR BLOWDOWN SYSTEM COMPONENT DESIGN PARAMETERS Nuclear Blowdown Demineralizers Primary Polishing Quantity 2 2 Resin Capacity, ft 3 150 90 Design Flow, gpm 250 250 Design Pressure, psig 150 150 Design Temperature, F 140 140 Material Type 304 stainless steel Resin Type Anion and/or cation exchange resins as required Nuclear Blowdown Spent Resin Storage Tank Quantity 1 Capacity, ft 3 600 Design Pressure, psig 1 50 Design Temperature, F 140 Material Type 304 stainless steel Nuclear Blowdown Resin Sluice Pump Quantity 1 Type Canned motor, centrifugal Capacity, gpm 150 Total Developed Head, ft 230 Material Wetted parts
- type 304 stainless steel
10.4-63 Reformatted November 2017 TABLE 10.4-8 EMERGENCY FEEDWATER SYSTEM FAILURE ANALYSIS FOR SECONDARY SIDE BREAK WITH LOSS OF NON
-1E ELECTRICAL POWER Component Malfunction Comment Any Emergency Feedwater Pump Fails to start The two remaining emergency feedwater pumps feed all three steam generators with the two unaffected steam generators receiving required flow. Flow is passively limited to the faulted SG steam generator by the cavitating venturi for 10 minutes (until operator action is credited). 1, 2 Motor Driven Pump ARC Valve Fails to automatically isolate pump recirculation path All three emergency feedwater pumps feed all three steam generators with the two unaffected steam generators receiving required flow. Flow is passively limited to the faulted SG steam generator by the cavitating venturi for 10 minutes (until operator action is credited). 1, 2 02-01 RN 12-030 98-053 98-053 98-053 10.4-64 Reformatted November 2017 TABLE 10.4
-8 (Continued)
EMERGENCY FEEDWATER SYSTEM FAILURE ANALYSIS FOR SECONDARY SIDE BREAK WITH LOSS OF NON
-1E ELECTRICAL POWER Component Malfunction Comment Electrical Channel A (instrumentation and power)
Failure (total loss)
Channel B motor driven emergency feedwater pumps and the Turbine Driven pump feed all three steam generators with the two unaffected steam generators receiving required flow. Flow is passively limited to the faulted SG steam generator by the cavitating venturi for 10 minutes (until operator action is credited). 1, 2 Electrical Channel B (instrumentation and power)
Failure (total loss)
Channel A motor driven emergency feedwater pump and the Turbine Driven pump feed all three steam generators with the two unaffected steam generators receiving required flow. Flow is passively limited to the faulted SG steam generator by the cavitating venturi for 10 minutes (until operator action is credited
). 1, 2 Notes: 1 The pressure and temperature analyses for secondary side pipe breaks inside containment credit operator action at 30 minutes to isolate emergency feedwater to the affected SG and thus allow for operator action outside of the control room. Action is required to prevent overpressurizing the containment.
2 The pressure and temperature analyses for secondary side pipe breaks outside containment credit operator action at 10 minutes to isolate emergency feedwater to the affected SG since the harsh environment will limit local manual actions.
Action is required to prevent environment conditions for equipment qualifications.
9 98-053 98-053 98-053 RN 12-030 RN 12-030 10.4-65 Reformatted November 2017 TABLE 10.4
-9 TURBINE BUILDING CLOSED CYCLE COOLING WATER SYSTEM DESIGN PARAMETERS Turbine Building Closed Cycle Cooling Water System Pumps Quantity 2 Type Horizontal Total Dynamic Head, ft 165 Capacity, gpm 8750 Speed, rpm 1170 Motor Horsepower 600 Turbine Building Closed Cycle Cooling Water System Cooling Tower Quantity 1 Type Wet Surface Air Cooler Number of Cells 2 Number of Cooling Coils 8 Number of Fan Assemblies 4 Cooling Coil Water Flow, gpm 8800 Entering Coil Water Temperature, F 107.8 Leaving Coil Water Temperature, F 94 Design Heat Load, Btu/Hr 60,720,000 Cooling Tower Spray Pumps Quantity 2 Type Vertical Turbine Manufacturer Goulds Total Dynamic Head, ft 46 Capacity, GPM 8500 Speed, RPM 880 Minimum Flow, GPM 2000 Shut-off Head, ft 75 Horsepower 125 02-01 02-01 02-01
Figures 10.4-2, 10.4-2a, and 10.4-2b Deleted per Amendment 96-03 Amendment 96-03 September 1996 SHT.NO.REV TO ATMOSPHERE DRAWING NUMBER FSARlFigure 10.4-3 1080B31 SHT.10 BLOCK STEAM DUMP TO POWER RELIEF VALVES (TRAI N A)I r---"-.....J I I I I I 1 20A MADE CHKD 1080837 SHT.10 I r--I I I I I I I BLOCK STEAM DUMP TO POWER RELIEF VALVES (TRAIN 8)208 I I POWER RELIEF VALVES NaT E.5'(SEE TABLE)L SQU.J-10lUS 5I-\OW"l UE.*
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VALVE PT I PV-2.000-MS PT-2000
REFERENCES:
U-302-011 B-802-001 WfOOUU32 W10BD831 IPV-2020-MS PT-2020 IPV-2010-MSPT-2010
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l I L..-.._BLOCK STEAM DUMP TO COOLDDOWN CONDENSER DUMP VALVES (TRAIN A)1080837 SHT.10 I I I L-------------
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l I L I I I I I I I I SYSTEM DIAGRAM FUNCTIONAL DIAGRAMS GU PROCESS CONTROL BLOCK OIAGRAMS 9 SHEET 18 GU FUNCTIONAL DIAGRAMS, SHEET 10 W108D932 W108D837
REFERENCES:
ATMOSPHERIC RELIEF VALVE (SEE TABLE)VALVE liP CONVERTER IFY-2006-MB MODULATING SIGNAL FROM TY-40801 NOTES: 1.SOLENOIDS SHOWN DE-ENERGIZED.
IFY-2016-MB TY-408Q1 IF V-2026-MB IFY-2026-MB TY-408Q2...\ondeck\dcn4\808031_0003.dgn Sep.2.7, 2001 15:04:06 H1:;Ul'" N::;c.;; 11: Z<:;;;;E." Il G c B D F E/C>W<Nl!L 11.0"zoe"00 XA xe..x X-XI!>" X XA XI!>X X""'-JCe..:x X-lCA XI!>X X](A XI!>X X](A XI!>X X 2 lAlt.E 2 AMENDMENT 96-03 SEPTEMBER 1996 Figure 10.4-40 FUNCTIONAL DIAGRAM MAIN STEAM SYSTEM<NUCLEAR)SOUTH CAROLINA ELECTRIC 8<GAS CO.VIRGIL C.SuMMER NUCLEAR STATION IIOTlS:.*.Sl3lflClID tAl'flS 11K SJIOn DE-IttUCUtD.
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6903C-LW 6" t-I-.....!J PENSTL-O-CK........."7&.8\ROb-"l lSQ05-LWas:::::!:z<l::z: o u w:>-<e:>*"-151X RNo-49 3/6'l04D-LW ROb-9/16Q04-LWI I I I ROo-58 6903D-LW 3"Z W::e z<Z o u w:>:>G F H J SOUTH CAROLINA ELECTRIC&GAS COMPANY FSAR Figure 10.4-17 r==Ji@00.6\Q\'<'='4£VIRGIL C.SUMMER NUCLEAR STATIONPIPING LIQUIDDIAGRAM:1..NUCLEAR PLANT TO FAIRFIELD PENSTOCK f:t DRAWING CLASS LEGIBILITY 1 NOTES 1.PIPING TO 8E NON NUCLEAR SAFETY CLASS 2.PIPING LINE SPECIFICATION TO 8E AS NOTED 3.GUARD PIPE TO BE 6%00.250 WALL API SPEC 5L GRADE B 4.CONTROL SELECTOR SWITCH LOCATED ON PANEL XPN-29-BD 5.ANNUNCIATION AT PUMPED STORAGE PLANT WHEN 6904 VALVE IS OPEN&IT'S ASSOCIATED GENERATION UNIT IS BELOW THE SPECIFIED GENERATION LEVEL 6.LOCATED ON PANEL XPN-7-BR 7.REFERENCE GIBBS&HILL DIAGRAM M-3CA (GAL DWG IMS-09-186-SH.
1'>PENSTOCK INTERLOCK CIRCUITRY (SEE NOTE 7)J I I I I I I I I I MIN HYDRO TEST J H REMARKS CHK'D 135<1Y.180 DJK F DURATION HYDRO BY UPSET 125 PSIG 1 110 100 fNO)PSIG*F I NORMAL KDESIGN ENGINEERINGSCANA Cc..fPANY V.C.SUMMER NUCLEAR 5T ArrON JENKINSVILLE:
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