ML20207J945
| ML20207J945 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/30/1986 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20207J930 | List: |
| References | |
| GL-83-28, NUDOCS 8701090040 | |
| Download: ML20207J945 (3) | |
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. SAFETY EVAUIATION REPORT GENERIC LETTER 83-28, ITEM ?.1 (PART 21 VENDOR INTERFACE PROGRAM (RTS COMPONENTSI YANKEE (ROWE) NUCLEAR POWER STATION DOCKET NO. 50-0?9
.a On February 25, 1983, both of the scram circuit breakers at Unit 1 of the Salem Nuclear Power Plant failed to open upnn an automatic reactor trip signal from the reactor protection system. This incident was terminated manually by the operator about 30 seconds after the initiation of the automatic trip sional.
The failure of the circuit breakers was determined to be related to the stickina of the undervoltage trip attachment.
Prior to this incidant, on February ??,
1983, at Unit 1 of the Salem Nuclear Power Plant, an automatic trip signal was generated based on steam generator low-low level during plant start-up, in this case, the reactor was tripped manually by the operator almost coincidentally with the automatic trip.
Following these incidents, on February 28, 1983, the NRC Executive Director for Operati6ns (E00), directed the staff to investigate and report on the generic implications of these occurrences at Unit 1 of the Salem Nuclear power Plant.
The results of the staff's inquiry into the generic implications of the Salem unit incidents are reported in NtlREG-1000, " Generic implications of the ATWS Events at the Salem Nuclear Power Plant." As a result of this investigation, I
the Commission (NRC) requested (by G9neric Letter 83-?8 dated sluly 8, 1983 l all licensees of operating reactors, applicants for an operating license, and holders of construction permits to respond to generic issues raised by the analyses of these two ATWS events.
8701070040 861230ADOCK05000g9 y
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This report is an evaluation of the response submitted by Yankee A,to
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0.1 ( Pa rt 91 Company, the licensee for the Yankee (Rowel Power Station for item The actual documents reviewed as part of this evalu-of Generic Letter 83-?8.
i ation are listed in the references at the end of the report.
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item ?.1 (Part 2) requires the licensee to confirm that an interface has j
established with the N955 or with the vendors of each of the componan Reactor Trip System which includes:
periodic communication betwaen the licenspo/ applicant and the j
NSSS or the vendors of each of the components of the Reactor 1
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Trip System, and a system of positive feedback which confirms rece l
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EVAttlATION_
Tha licensee for the Yankee (Rowe) Nuclear Power Station responded to th
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requirements of iten ? 1 (Part 2) with submittals dated November S,148 The licensee stated in these submittals that Westinghouse is 3
July 9, 198S.
the NSSS for the Yankee (Rowe) Nuclear Power Station, and that the e
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cluded as part of the Westinghouse interface program established for t i
The response also confirns that this interface program includes both pe i
l communication between Westinghouse and the licensee and positive feo I
the licensee in the form of signed receipts for technical infomation trans-mitted by Westinghouse.
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CONCUISION P,ased on our review of these responses, we find the licensee's sta ts firm that a vendor interface program exists with the NS$$ vendor for This program that are required for performance of the reactor trip function.
4 Letter 83-?R, and neets the requirements of item 2.1 (Part 2) of the Generic i
is therefore acceptable.
REFERENCES _
NRC Letter, D. G. Eisenhut to all Licensees of Operating Reactors, i I 1.
ll Applicants for Operatina License, and Holders of Construction I
" Required Actions Rased on Generic implications of Salem AT I
(Generic Letter 83-28)," July 8, 1983.
l Yankee Atomic Electric Company letter to NRC, L. H. Heider, to i
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l Darrell G. Eisenhut, Director, Division of Licensina, " Response to 1
l Generic Letter 83-28," November 5, 1983.
i Yankee Atomic Electric Company letter to NRC, G, Papanic to 3.
.1. A. Zwnlinski, Division of Licensing, " Generic Letter 83-28, Request for Additional information,",1uly 9, 1985.
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