ML20148G663

Proposed Tech Specs,Requesting Minimum Required Level in Condensate Storage Pool Be Increased from 82% to 91% to Account for Vortexing & Instrumentation Measurement Uncertainties

ML20148G663
Person / Time
Site:	Waterford
Issue date:	06/03/1997
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20148G625	List: ML20148G622 ML20148G637 ML20148G645 ML20148G663
References
NUDOCS 9706060077
Download: ML20148G663 (2)

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l W3F1-97-0111 SUPPLEMENT TO NPF-38-179 ATTACHMENT D BASES-9706060077 970603 I PDR ADOCK'05000382 P PDR

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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.

[. 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  ;

J sufficient to ensure that adequate feedwater flow is available to remove decay heat and - ,

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  :

} 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 . [

volume ensures that sufficient water is available (170.000 callons) to coc! the Reactor Coolant {

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

. hours 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  ;

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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  !

] 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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