ML20116L135

Informs That Suppl to TS Amend Request Re Standby Nuclear Svc Water Pond Submitted on 920422 Remain Valid

ML20116L135
Person / Time
Site:	Catawba
Issue date:	11/04/1992
From:	Tuckman M DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9211180179
Download: ML20116L135 (3)

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Db Iwsr Company _. AfS num Caawba Nuckar (icneration Department - nce President 600 Concord h%ad (SU3)KilJ205 OMct Wrk. SC 29745 (M3)Mid426 D t DUKE POWER November 4,1992 ,

U. S. Nuclear Regulatory Commission A'ITN: Document Control Desk Washington, D.C. 20555

Subject:

Catawba Nuclear Station Docket Nos. 50-413 and 50-414 Supplement to TS Amendment Request Standby Nuclear Service Water Pond Hal Tucker's letter dated June 7,1990 requested an amendment to the required temperature and monitoring depth (Technical Specification 3.7.5.b) for the Catawba Nuclear Service-Water Pond. M. S. Tuckman's letter dated April 22,1992 revised the submittal to account -

for a 2.4"F discrepancy between the NRC SNSWP analysis and the Duke Power Pond analysis. The supplement also revised the monitoring depth to ensure that the needed '

volume of water would be available at or below 91.5'F.

The June 7,1990 submittal reported that the highest recorded surface temperature of the SNSWP was 82'F in 1986. This temperature was revised by the April 22,1992 submittal  ;

to be 85'F in June 1990. It has since been determined that these temperatures are not the highest recorded surface temperatures. During initial operation, SNSWP surveys were not performed on a regular basis because they were not required. These surveys were done -

at the request of individuals, not systematically. During the summer of 1989 a program.

was instituted to systematically measure SNSWP temperatures during the summer months because it had been recognized that the TS requirement did not conservatively ensure operability. Since that time, there has been an effort to consolidate previously measured data. As a result, some data is now available which was not available in the past. Some of this newly consolidated data indicates that higher surface temperatures were measured during the specified time periods. The adequacy of the pond is based on the total heat <

contained in the pond at the start of the accident. Therefore,. minor differences in the highest reported surface temperature in no way affect the conclusions made'in previous submittals. The SNSWP analysis assumes that the entire volume of water contained in the pond is at 915 F at the start of the Design Basis Accident. Reporting a surface i

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U. S. Nuclear Regulatory Commission November 4,1992 Page 2 temperature alone holds no significance with respect to the amount of thermal margin contained in the SNSWP. The assumptions in the current analysis are still considered >

conservative with respect to all previously observei SNSWP temperature profiles, Therefore the conclusions in the previous submittals remain valid.

Very truly yours,

! M. S. Tuckman i

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U. S. Nuclear Regulatory Commission November 4,1992 Page 3 xc: Mr. S. D. Ebneter Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Heyward Shealy, Chief Bureau of Radiological Health South Carolina Department of Health &

Environmental Conwl 2600 Bull Stri .

Columbia, South Carolina 29201  ;

American Nuclear Insurers c/o Dottie Sherman,- ANI Library The Exchange, Suite 245 270 Farmington ~ Avenue Farmington, CT 06032 1: & M Nuclear Consultants 1166 Avenue of the Americas .

New York, New York 10020 INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 Mr. 'W. T. Orders NRC Resident _ Inspector Catawba Nuclear Station Mr. R. E. Martin Office of Nuclear Reactor Regulation -

' U. S. Nuclear Regulatory Commission One White Flint North -

Mail Stop 14H25 4 l . Washington, D.C. 20555

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