ML20213A561

SER Accepting Util 831104 Response to Generic Ltr 83-28,Item 2.1 (Part 2) Re Vendor Interface Program for Reactor Trip Sys Components

ML20213A561
Person / Time
Site:	Summer
Issue date:	01/30/1987
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20213A559	List: ML20213A557 ML20213A561
References
GL-83-28, NUDOCS 8702030351
Download: ML20213A561 (3)

Text

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ENCLOSURE SAFETY EVALUATION REPORT AENERIC LETTER 83-28, ITEM ?.1 (pART ?)

VENDOR INTFRFACE PROGRAM (RTS COMPONENTS 1 VIRGIL C. SIIMMER NUCLEAR STATTON, UNTT 1 DOCKET NO. 345 On February 25, 1083, both of the scram circuit breakers at linit 1 of the Salem Nuclear Power Plant failed to open upon 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 signal.

The failure of the circuit breakers was determined to be related to the sticking of the undervoltage trip attachment. Prior to this incident, 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 Operations (ED0), directed the staff to investigate and report on the generic implications of these occurrences at Unit 1 of the Salen Nuclear Power Plant.

The results of the staff's inquiry into the generic implications of the Salen unit incidents are reported in NUREG-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 Generic Letter 83-28 dated July 8,1983 I l

all licensees of operating reactors, applicants for an operatino license, and holders of construction permits to respond to generic issues raised by the

! analyses of these two ATWS e ents.

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This report is an evaluation of the response submitted by 30uth Carolina Electric & Gas Company, the licensee for the Virgil C. Summer Nuclear Station, Unit 1 for item 2.1 (Part 2) of Generic Letter 83 78. The actual documents reviewed as part of this evaluation are listed in the references at the end of the report.

Item 2.1 (Part 2) requires the licensee to confirm that an interface has been established with the NSSS or with the vendors of each of the components of the Reactor Trip System which includes:

periodic communication between the licensee / applicant and the NSSS or the vendors of each of the components of the Reactor Trip System, and -

a cystem of positive feedback which confirms receipt by the licensee / applicant of transmittals of vendor technical information.

EVAUIATTON The licensee for the Virgil C. Sumer Nuclear Station, Unit I responded to the 2

requirements of item 2.1 (Part ?) with a submittal dated November 4, 1083 . The licensee stated in this submittal that Westinghouse is the NSSS for the Virail C. Summar Nuclear Station, Unit 1 and that the RTS is included as part of the Westinghouse interface program established for this plant. The response also confirms that this interface program includes both periodic comrr.unication between Westinghouse and the licensee and positive feedback from the licensee in the form of signed receipts for technical infomation transmitted by Westinghouse.

CONCLtlSION Based on our review of these responses, we find the licensee's statements confirm that a vendor interface program exists with the NSSS vendor for components that are required for performance of the reactor trip function.

This program meets the requirements of Item 2.1 (Part 21 of the Generic Letter 83-?8, and is therefore acceptable.

REFERENCES

1. NRC Letter, D. G. Eisenhut to all Licensees of Operating Peactors, Applicants for Operating License, and Holders of Construction Permits,

" Required Actions Based on Generic Implications of Salem ATWS Events (Generic Letter 83-28)," July 8, 1983.

2. South Carolina Electric and Gas letter to NRC, O. W. Dixon to Harold R. Denton, Director, Office of Nuclear Peactor Regulation, " Generic' Letter 83-28," November 4, 1983.

Principal Contributors:

Jon B. Hopkins, Profect Directorate #2, DPLA Donald Lasher, Electrical, Instrumentation and Control Svstems Rranch, DPLA F. G. Farmer, EG&G Idaho, Inc.

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