ML20212A908
| ML20212A908 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 10/16/1997 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20212A904 | List: |
| References | |
| NUDOCS 9710270080 | |
| Download: ML20212A908 (7) | |
Text
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. Fuel Storage Pool Makeup Water Sources 3.7.9 3.7 PLANT SYSTEMS 3.7.9 Fuel Storap Pool Makeup Water Sources j
. - LCO 3.7.9 One fuel storage pool rnakeup water source shall be OPERABLE.
.-.___. N OT E S---- .-.--- - --..--..--.~ ..-
- 1. OPERABILITY of either the cask washdown pit or the passive containment cooling water source is required when the calculated spent fuel storage pool decay heat 2 2.15 MWt. and s 2.77 MWt.
- 2. OPERABILITY of the passive containtnent cooling water source is required when the cabulated spent fuel storage pool decay heat > 2.77 LN/t.
i APPLICABILITY: During storage of fuel in the fuel storage pool with a calculated decay heat 2 2.15 MWI.
ACTIONS REOUIRED ACTION COMPLETION TIME 1
A. Required fuel storage pool NOTE makeup water source LCO 3.0.3 is not appiecable.
inoperable. . - - - - - - - - -- -
A.1 Initiate achon to restore the required immediately makeup water source to OPERABLE status.
9710270000 971016 PDR ADOCK 05200003 E pm AP600 3.71 ORAFT October 16,1997
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Fuel Storage Pool Makeup Water Sources 3.7.9
- - SURVEILLANCE REQUIREMENTS -
SURVEILLANCE FR M M SR 3.7.9.1 Venty the passive containment cooling system water storage 7 days tank volume is 2 400,000 gallons.
SR 3.7.9.2 Venfy the water level in the cask washdown pit is 213.75 ft. 30 days SR 3.7.9.3 Venty the spent fuel storage pool makeup isolation valves. In accordance with
, PCS-PL V009, PCS PL V045, PCS-PL V049, PCS PL V051, the Inservice Testing SFS PL V066 and SFS-PL V068 are OPERABLE in Program accordance with the Inservice Testing Program.
s AP600 3.72 DRAFT October 16,1997 W a-_. , e
- , Fuel Storage Pool Makeup Water Sources B 3.7.9 B 3.7. Pl. ANT SYSTEMS l
B 3.7.9 Fuel Storage Pool Makeup Water Sources BASES BACKGROUND The spent fuel storage pool is normally cooled by the nonsafety spent fuel pool cooling system. In the event the normal cooling system is unavailable, the spent fuel
, storage pool can be cooled by the normal residual heat removal system. Altematively, the spent fuel storage pool contains sufficient water inventory for decay heat removal by boiling. To support extended periods of loss of normal pool cooling. makeup water is required to provide additional cooling by boiling. Several nonsafe,, .. seup sources are available, if AC power is available. Additionally, gravity fed makeup is available from the nonsafety ground level containment cooling ancillary water storage tank.
Two safety related, gravity fed sources of makeup water are provided to the spent fuel storage pool. These makeup water sources contain sufficient water to maintain spent fuel storage pool cooling for 7 days. The containment cooling system water storage tank provides makeup water following a full core off load (decay heat > 2.77 MWt).
The cask washdown pit provides makeup water following a 1/3 core refueling (decay heat 2 2.15.MWt and s 2.77 MWt).
The containment cooling system water storage tank is isolated by two normally closed valves. The norraally closed valves will be opened only to provide emergency makeup to the spent fuel storage pool. A downstream valve permits the operator to regulate addebon of water to the spent fuel storage pool as required to maintain the cooling water inventory.
Once decay heat of the 1/3 core off-load is reduced to below 2.15 MWt, the spent fuel storage pool water inventory is sufficient, without makeup, to maintain spent fuel storage pool for 7 days. When the spent fuel storage pool decay heat load is reduced below 2.15 MWt (approximately 17 days), the cask washdown pit may be drained and retumed to use for shippmg cask cleaning operations.
A general description of the fuel storage pool design is given in the SSAR, Seebon 9.1.2 (Ref.1). A description of tho Spent Fuel Pool Cooling and Cleanup System is given in the SSAR, Seebon 9.1.3 (Aef. 2).
,, (continued)
AP60C B 3.7 3 DRAFT October 16,1997 I
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Fuel Storage Pool Makeup Water Sources B 3.7.9
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- BASES-
- APPLICABLE - In the event the normal spent fuel stu'ge pool cooling system is unavailab's. ine SAFETY ANALYSES spent fuel cooling is provided by the heat capacrty of the water in the pool. The worst case decay heat load (decay heat > 2.77 MWt) !s produced by an emergency full core off load following a refueling plus ten years of spent fuel. T_he spent fuel storage pool inventory provided by the water over the stored fuel and below the pump suction connection is capable of cooling the spent fuel storage pool without boiling for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, followmg a loss of normal spent fuel storage pool cooling. After boiling starts, makeup water may be required to replace water lost by boiling and is available, without offsite support, via connections from the two safety related sources, if the_ decay heat load is s 2.77 MWt, the cask washdown pit contains sufficient water to assure spent fuel cooling for 7 days, if the decay heat load is > 2.77 MWt, the l
larger water inventory provided by containment cooling water tank may be required to assure spent fuel ecoling for 7 days.
The requirements of LCO 3.6.6, ' Passive Containment Cooling System . Operating,'
are appibable in MODES 1,2,3, and 4 and LCO 3.6.7, ' Passive Containment Cooling System Shutdown,' are applicable in MODES 5 and 6 with decay heat > 6.0 fAWt. LCOs 3.6.6 and 3.6.7 require avadabdity of the containment cooling water tank for contamment heat removal. Below 6.0 MWt decay heat, containment air cooling is adequate. Since there are no desgn conditions which result in both reactor decay heat > 6 MWt and spent fuel storage pool decay heat > 2.77 MWt, the applicabdity for -
LCO 3.6.6/3.6.7 a.nd for LCO 3.7.9 are mutually exclusve.
Since none of the SSAR Chapter 15 Demgn Basis Accident analyiies assume avadabdity of the contamment coolmg water tank or the cask washdown pit 'or spent fuel storage pool makeup, the fuel storage pool makeup water sources specification does not samsty any of the NRC Policy Statement criteria. . This LCO is included in accordance with NRC guidance provided in NRC letter reference 3.
(continued)
AP600- B 3.7 4 DRAFT October 16,-1997 l
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., Fuel Storage Pool Water Level B 3.7.15 7
-. / BASES - (continued) -
LCO_ - The fuel storage pool makeup water sources, the cask washdown pit and tho'
- containment cooling water tank, are required to contain 13.75 ft.- and 400,000 gallons of water, respectively. An OPERABLE flow path from the requited makeup source assures spent fuel cocling for at least ? days.
Note 1 specifies that either the cask washdown pit or the passive containment cooling water storage tank is required to be OPERABLE when the spent fuel storage pool decay heat 2 2.15 MWL and 5 2.77 MWt. Note 2 specifies ' hat the passive containmer,t cooling water storage tank source is required to be OPERABLE when the spent fuel storage poci decay heat is > 2.77 MWt, which is normal following a full core off load. The larger makeup source is necessary for the higher decay heat load.
When a portion of the fuel is retumed to the reactor vessel in preparation for startup, the pool decay heat is reduced to 5 2.77 MWt and makeup from the cask washdown pit is sufficient.
APPLICABILITY This LCO applies during storage of fuel in the fuel storage pod with a calculated decay heat 2 2.15 MWt, which is normal for a penod of time after re(ueling 1/3 of the C0re. .
Approximately 17 days after a 1/3 core refueimg, the decay heat load in the spent fuel storage pool is reduced to < 2.15 MWt and this LCO is no longer appicable. With
- decay heat < 2.15 MWt, the assumed spent fuel storage pool water inventory (i.e.,
level below the pomp suchon connechon to the pool) provides for 7 days of cooling
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without makeup.-
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(continued)
AP600 B3.75 DPAFT October 16,1997
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- , . Fuel Storage Pool Water Level
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B 3.7.15 3 BASES (continued)
ACTIONS M Aequired Action A.1 is modified by a Note indicating that LCO 3.0.3 does not apply, if the passive containment cooling water storage tank (with decay heat > 2.77 MWt) .
and/ or the cask washdown pit (with decay heat 2 2.15 and 2.77 MWt ) is -
, inoperable, Action must be initiated immediately to restore the makeup source or its associ1ted flow path to OPERABLE status.
Addittnally, in order to ;,rovide the maxirnm cookng capability, the spent fuel pool should be filled to its maximum level. Nonsafety related makeup sources can be used to fill the pool. This action is not specified in the spec 6 cation, since the benett of .
adding approximately 6 inches of water to the pool is less than a 5% improvement in j coolmg capability.
StJRVEILLANCE 28.3.7.9.1 FJOUIREMENTS This SR verifies sufficient passive contamment coolmg system water storage _ tank volume is available in the event of a loss of spent fuel cooling. The volume spec 6ed (400,000 gallons) is less than the 531,000 capacity of the tank and allows tesbng of the passive contamment coolmg system during refuehng outages, while maintammg an adequate makeup water supply.
The 7 dcy Frequency is appropnale because the volume in the passive containment coolmg system water storage tank is normally stele and water level changes are controlled by plant procedures.
SR 17.9.2 This SR venfies sufficent cask washdown pit water volume is available in the event of a loss of sport fuel coolmg. The 13.7f ft. level specified provides makeup water for stored fuel with decay heat 2 2.15 and s 2.77 MWt.
The 30 day Frequency is appropnate because the cask washdown pit has only one drain line which is isolated by senes manual vahos which are only operated in accordance with plant procedures, thus providmg assurance that inadvertent level reduchon is not likely.
. (continued)
AP600 B 3.7 6 ORAFT October 16,1997 l
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,. Fuel Storage Pool Water level e
B 3.7.15 4
BASES (continued) .
SURVEILLANCE SR 3.7.9.3 REQUIREMENTS (continued)
Th's SR requires verifcation of the OPERABILITY of the manual makeup water source isolation valves in accordance with the requirements and Sequency specified in the Inservice Testing Program. Manual valves PCS PL V009, PCSJL V045, PCS-PL-V049, PCS PL V051, isolate die makeup flow path from the passive containment cooling system water storage tank. Manual valves SFS-PL V066 and SFS-PL V068 isolate the makeup flow path from the cask washdown pit.
REFERENCES 1. FSAR, Section 9.1.2 '
- 2. FSAR, Section 9.1.3.
- 3. NRC letter, William C. Huffman to Westinghouse Electric Corporation,
' Summary of Tele;A:ne Conference with Westinghouse to Discuss Proposed Design Changes to tra AP600 Main Control Room Habitability System,' dated September 11,1997.
i (continued)
AP600 B3.77 DRAFT October 16,1997 l