ML20076E319

Interim Deficiency Rept Sdar CP-86-41 Re Small Break LOCA During Mode 4 Operation.Initially Reported on 860528.Results of Analysis Described in Draft Rept Confirm That Current ECCS Design Adequate for LOCA During Mode 3 & 4 Operation

ML20076E319
Person / Time
Site:	Comanche Peak
Issue date:	08/13/1991
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
SDAR-CP-86-41, TXX-91296, NUDOCS 9108190245
Download: ML20076E319 (2)

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l MM Log # TXX-91296 1 """

Fi1e # 10110 r C CP-86 41 Ref. # 10CFR50.55(e) 7UELECTRIC w mism J. c hm, Jr. August 13. 1991 Lara.Itve Ike besulent U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

C0HANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET N05, 50-445 AND 50-446 SHALL BREAK LOCA H0DE 4 OPERATION SDAR CP-86-41 (INTERIM REPORT)

REF: 1) TU Electric Letter logged TXX-90288 f rom William J. Cahill, Jr.

to NRC dated August 13, 1990 Gentlemen:

On May 28, 1986. Td Electric orally notified your Mr.1. Barnes of a deficiency involving evaluation of the effect of a small break Loss of Coolant Accident (LOCA) during Mode 4 operation. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).

As of the last interim report (reference 1), the Westinghouse Owner's Group (WOG) had not issued a final report. Specific issues associated with the switch over of the Residual Heat Removal System to the safety injection mode had not been resolved.

TV Electric has continued to participate in WOG activities concerning the Shutdown LOCA Analysis. A draft report has been issued by the WOG Analysis Subcommittee for review and comment by WOG members. The results of analysis described in the draft report confirm that the current Emergency Core Cooling System design, as well as the operator action time, are adequate for meeting the requirements of 10 CFR 50.46 for a LOCA during Mode 3 and Mode 4 operation.

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400 North Olive Street LB. 81 Dallas, Texas 7520I 1

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TXX-91296 Page 2 of 2 The WOG final report is expected to be issued in the Fall of 1991. Based on the final report, TV Electric will provide a status update on this issue by February 27, 1992.

Sincerely.

William J. Cahill, Jr.

By: e /IM J. 5. Marshall Generic Licensing Manager DNB/dnb c - Mr. R. D. Hartin, Region IV Resident Inspectors, CPSES (2)

Mr. T. A. Bergman, NRR Hr. H. B. Fields. NRR 1

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