ML20148G663
| ML20148G663 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 06/03/1997 |
| From: | ENTERGY OPERATIONS, INC. |
| To: | |
| Shared Package | |
| ML20148G625 | List: |
| References | |
| NUDOCS 9706060077 | |
| Download: ML20148G663 (2) | |
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l W3F1-97-0111 SUPPLEMENT TO NPF-38-179 ATTACHMENT D BASES-I 9706060077 970603 PDR ADOCK'05000382 P
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i PLANT SYSTEMS
.l BASES 3/4.7.1.2 EMERGENCY FEEDWATER SYSTEM
. The OPERABILITY of the emergency feedwater system ensures that the Reactor Coolant System can be cooled down to less than 350 F from normal operating conditions in i
the event of a total loss-of-offsite power.
Each electric-driven emergency feedwater pump is capable of delivering a total
- feedwater flow of 350 gpm at a pressure of 1163 psig to the entrance of the steam generators.
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The steam-driven emergency feedwater pump is capable of delivering a total feedwator flow of 700 gpm at a pressure of 1163 psig to the entrance of the steam generators. This capacity is sufficient to ensure that adequate feedwater flow is available to remove decay heat and -
J reduce the Reactor Coolant System temperature to less than 350 F when the shutdown l
cooling system may be placed into operation.
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The' surveillance requirement to verify the minimum pump discharge pressure on
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recirculation flow ensures that the pump performance curve has not degraded below that used I
to show that the pumps meet the above flow requirements and is consistent with the j;
requirements of ASME Section XI.
- 3/4.7.1.3 CONDENSATE STORAGE POOL l
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- The OPERABILITY of the condensate storage pool (CSP) with the minimum water.
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volume ensures that sufficient water is available (170.000 callons) to coc! the Reactor Coolant
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l System to shutdown cooling entry conditions (?"F) following any design basis accident.
Additional makeup water is stored in the wet cooling tower (WCT) basins providing the capability to maintain HOT STANDBY conditions for at least an additional 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> prior to initiating shutdown cooling. The total makeup capacity also provides sufficient cooling for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> until shutdown cooling is initiated in the event the cooling-towers ultimate heat sink i
sustains tomado damage cencurrent with the tomado event. aseident er " r Ser eooidewnh rm!-d. The CSP contained water volume limit (91% indicated) includes an allowance for water not usable because of t-M 96:rge '^^rSer, vortex prevention.
instrumentation uncertainties, and short term reauirements for the component coolina water i
makeuo system. or OS:t phy92! derr$ter. This providas an assurance that a minimum of 170.000 callons of water is available in the CSP for the emeroency feedwater system. If L
n_atural circulation is reouired the combined capacity (WCT and CSP) is sufficient to maintain the plant at HOT STANDBY for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> followed by a cooldown to shutdown cooling entry conditions assuming the availability of only onsite power or only offsite
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power, and the worst single failure (loss of a diesel generator or atmospheric dump valve). This j
. requires approximately 275,000 gallons and complies with BTP RSB 5-1.
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' WATERFORD - UNIT 3 '
B 3/4 7-2 P
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