ML20138K958

Safety Evaluation Accepting Util 850617 Response to Generic Ltr 83-28,Items 4.2.1 & 4.2.2 Re 18-month Preventive Maint Frequency for Reactor Trip Breakers

ML20138K958
Person / Time
Site:	Beaver Valley
Issue date:	10/08/1985
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20138K934	List: ML20138K930 ML20138K958
References
GL-83-28, NUDOCS 8510310092
Download: ML20138K958 (2)

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,og UNITED STATES y g NUCLEAR REGULATORY COMMISSION O zj WASHINGTON, D. C. 20555 4*****$' SAFETY EVALUATION BY THE OFFICE OF hUCLEAR REAGIOR REGULATION BEAVER VALLEY POWER STATION, UNIT NO. 1 REACTOR IRIP SYSIEM RELIABILITY ITEM 4.2.1 AND 4.2.2 0F GENERIC LtiltR 8? 28 INTRODUCTION On April 24, 1985, the NRC issued a Preliminary Safety Evaluation (SE) for the Beaver Valley Power Station, Unit No.1, on Generic Letter 83-28, Items 4.2.1 and 4.2.2. The preliminary SE was based on the licensee's July 8, 1983 and October 30, 1984, submittals. The SE accepted the licensee's position on Item 4.2.2 and requested additional justification for his position on the 18-month preventive maintenance frequency (Item 4.2.1) on the Reactor Trip Breakers (RTBs). The licensee responded to the SE by a submittal dated June 17, 1985, in which he sununarized the RTB history and performance. This SE presents our additional evaluation of the licensee's

• position on Item 4.2.1, based on his latest and previous submittals.

, DISCUSSION AND EVALUATION The licensee's June 17, 1985, submittal provides additional justification for his choice of an 18-month preventive maintenance frequency on the RTBs.

We have reviewed the submittal with its attached tables and figures that presented the RTB history and perfonnance in Beaver Valley Power Station, Unit 1. The following is found:

Breaker cycles do not exceed 200 in an average 18-month period; The licensee's position on trending gces well beyond our minimum requirements; The licensee has started to trend the trip force among several other trendable parameters. Only one point is recorded for the trip force, dated December 15, 1984. However, the licensee stated in his October, 1984 response that he will continue to trend and review the trip force and several other parameters on an 18-month basis. Any unacceptable or questionable condition is identified and reported to supervision for appropriate corrective action;

- Most of the recorded repairs shown in Table 1 of the licensee's June 17, 1985, submittal involved either the control circuit or main contacts. Only one repair required maintenance on the under voltage trip attachment (UVTA) when the UVTA would not allow the breaker to stay closed. The recorded data start at January 7, 1982.

8510310092 851008 PDR ADOCK 05000334 P PDR l

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CONCLUSION Based on the above, we find the licensee's justification for the 18-month preventive maintenance adequate. The information provided demonstrates acceptable performance using the licensee's current maintenance, surveillance and trending programs. On this basis the licensee's position ca Item 4.2.1 is acceptable. Item 4.2.2 has been found acceptable in our April 24,1985 Preliminary Safety Evaluation; the portion of that preliminary SE describing Item 4.2.2 is hereby incorporated by reference into this document.

Dated: October 8, 1985 P incipal Contributor:

N. Komney S

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