ML20059K822

Provides Results from Sys Tests Which Verified That Increased SSW & Fuel Pool Cooling Flow Rates Obtainable While Maintaining Required Flows to Other Components

ML20059K822
Person / Time
Site:	Grand Gulf
Issue date:	11/08/1993
From:	Hutchinson C ENTERGY OPERATIONS, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GNRO-93-00131, GNRO-93-131, NUDOCS 9311160208
Download: ML20059K822 (3)

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' ~~ ENTERGY eo Box 75e Por1Gibson,MS 39150 Tel 601437 2800 November 8, 1993

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Operators -

Grand Gut! Nocear Staton U.S. Nuclear Regulatory Commission Mail Station Pl-37 Washington, D.C.

20555 Attention:

Document Control Desk

Subject:

Grand Gulf Nuclear Station Docket No. 50-416 License No. NPF-29 Verification of Standby Service Water and Fuel Pool Cooling Flow Rates GNRO-93/00131 Gentlemen:

In a letter dated November 01, 1991 (GNRO-91/00145), Entergy Operations, on behalf of the Grand Gulf Nuclear Station (GGNS) proposed an engineering solution that would. provide sufficient spent fuel pool cooling capacity for the worst case normal design decay heat loads for the spent fuel pool.

The worst case being a full pool containing 4348 spent fuel assemblies.

The solution proposed consisted of operation of the fuel pool cooling and cleanup system (FPCC) with one FPCC pump through two FPCC heat exchangers with cooling provided by standby service water (SSW).

In a letter dated July 30, 1992 (GNRI-92/00163), the NRC provided its Safety Evaluation Report (SER) approving this mode of operation of the FPCC as a means of insuring sufficient spent fuel pool decay heat removal without reliance on the residual heat removal system for back up cooling.

Final approval was contingent on verification that the increased SSW and FPCC flows necessary for the one pump two heat exchanger mode of operation are within the capability of the systems.

The SER requested these flow results be submitted prior to restart from refueling outage six.

This letter fulfills that commitment by providing results from system tests which verify these increased flows are obtainable, while maintaining the required flows to other components.

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November 8, 1993 GNRO-93/00131 Page 2 of 3 equest submittal A forthcoming GGNS operating license change r it of 2324 (TS to remove the Technical Specifications limspent fuel assem h

4348 spaces in the GGNS spent fuel pool,results will bring the GGNS 5.6.3) l cooling issue to a close.

Yours truly,

/* W CRH/JEO/

c FPCC and SSW Flow Results (w/a) attachment:

Mr. R. H. Bernhard Mr. H. W. Keiser (w/a) cc:

Mr. R. B. McGehee (w/a)

Mr. N. S. Reynolds (w/a)

Mr. H. L. Thomas (w/o)

Ebneter (w/a)

Mr. Stewart D.

Regional Administrator U.S. Nuclear Regulatory Commission Region II Suite 2900 101 Marietta St.,

N.W.,

30323 Atlanta, Georgia O'Connor, Project Manager (w/2)

Mr. P. W.

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 13H3 Washington, D.C.

20555 G9310051

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Attachmnnt to GNRO-93/00131 j

rage 1 of 1

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VERIFICATION OF INCREASED FUEL POOL AND STANDBY f

j SERVICE NATER SYSTEK FLONS

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REQUIRED TEST t

FLON DATA a

l FPCC Pump A 1600 1620 GPM FPCC Pump B 1600 1600 GPM SSW A*

A and B Fuel Pool HTEXs 2508 2556 GPM h

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• The "A" Train, which has higher flow requirements was tested.

Apart from the flow differences, both A and B trains are identical.

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