ML20070K884

Suppls 910107 Request for ASME Code Relief Request Re Repair of Svc Water Supply Line to Diesel Generator 4. Repairs Will Be Completed During Unit 2 Outage

ML20070K884
Person / Time
Site:	Brunswick
Issue date:	03/11/1991
From:	Vaughn G CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NLS-91-063, NLS-91-63, TAC-79382, NUDOCS 9103190192
Download: ML20070K884 (2)

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• Carolina Power & Light Company P.O. Box 1551 e Ral.igh N C. 27602 MAR 111991 SERIAL: NLS 91063 "dj,^,SU/n$" 10CFR50.55a wuci r s.mc o.p.nm.nr United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-324/ LICENSE NO. DPR 62 SUPPLEMENT TO ASME CODE RELIEF REQUEST SERVICE WATER (NRC TAC NO. 79382)

Gentlemen:

On January '7,1991, Carolina Power & Light Company submitted ASME Code relief request in accordance with 10 CFR 50.55a pertaining to a temporary repair to the service water supply line to diesel generator no. 4. During the February 1991 Licensing issues Meeting held on February 27,1991, the NRR staff requested information concerning the feasibility of performing the permanent repairs to this line while Unit 2 is operating. This letter provides the requested information.

l Carolina Power & Light Company considered performing the permanent repairs to the service water supply line to diesel generator no. 4 while Unit 2 is operating. However, this would require isolation of the line and, as such, entering a voluntary 7-day Limiting Condition for Operation (LCO) for diesel generator no. 4. Since the diesel generators are shared between Units 1 and 2, an LCO on diesel generator no. 4 would affect both l

units. If a second diesel generator were then to become inoperable a 12-hour LCO would be entered on each unit which would likely result in an unscheduled shutdown of one or both units. From a probabilistic risk analysis standpoint, entering a voluntary LCO on diesel generators is not desirable. Therefore, to reduce the risk of a forced shutdown of one or both units, CP&L determined that completing the permanent repairs during a Unit 2 outage would be a better option.

The diesel generator service water relief request, submitted on January,7,1991, demonstrates that there are no operability concerns associated with the temporary repair.

Therefore, it is not prudent to perform the permanent repair while Unit 2 is operating as it would require that a safety system be removed from service and risk possible shutdown of a unit.

9103190192 910311 PDR ADOCK 05000324 //7

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Document Control Desk NLS 91-063 / Page 2 The diesel generator service water relief request, submitted on January,7,1991, stated that permanent repairs of the service water supply line would be made during the next Unit 2 maintenance outage which, at that time, was scheduled to begin on April 13, 1991. Subsequently, actions are being taken to eliminate the need for this outage.

Therefore, CP&L currently plans to perform the permanent repairs during the Unit 2 Reload 9 outage, currently scheduled to begin in September 1991. As committed to in the January 7,1991 submittal, the Company will continue to perform weekly surveillances to monitor for leakage from this pipe and UT NDEs every 3 months until the permanent fix is installed. A permanent repair will be implemented if these inspections reveal that it is necessary.

Please refer any questions regarding this submittal to Mr. M. R. Oates at (919) 546 6063.

Yours very truly, ghl tm G. E. Vaughn GEV/ MAT cc: Mr, S. D. Ebneter Mr. N. B. Le Mr. R. L Prevatte i

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