ML20207N596

Safety Evaluation of Util 831104 Response to Generic Ltr 83-28,Item 2.1 (Part 2), Vendor Interface Program - Reactor Trip Sys Components. Util Response Acceptable

ML20207N596
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/09/1987
From:	NRC
To:
Shared Package
ML19310H790	List: ML20207N528 ML20207N596
References
GL-83-28, TAC-52890, NUDOCS 8701140309
Download: ML20207N596 (3)

Text

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. SAFETY EVALUATION GENERIC LEIItR 83-78, ITEM 2.1 (PART 2)

VENDOR INTERFACE PROGRAM (RTS COMPONENTS)

TROJAN NUCLEAR PLANT DOCKET NO. 344 On February 25, 1983, both of the scram circuit breakers at Unit 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 22, 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 Operation (ED0), directed the staff to investigate and report on the generic

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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 NUREG-1000, " Generic Implications of the ATWS Events at the Salem Nuclear Power Plant." As a result of this investigation,

the Commission (NRC) requested (by Generic Letter 83-28 dated July 8, 1983I )

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

analyses of these two ATWS events.

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8701140309 870109 PDR ADOCK 05000344 P PDR -

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This report is an evaluation of the response submitted by Portland General Electric Company, the licensee for the Trojan Nuclear Plant, for Item 2.1 (Part 21 of Generic Letter 83-28. 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 Peactor Trip System, and a system of positive feedback which confirms receipt by the licensee / applicant of transmittals of vendor technical information.

EVALUATION The licensee for the Trojan Nuclear Plant responded to the requirements of 2

Item 2.1 (Part 2) with a submittal dated November 4, 1983 . The licensee

, stated in this submittal that Westinghouse is the NSSS for the Trojan Nuclear Plant 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 communication between Westinghouse and the licensee and positive feedback from the licensee in the form of signed receipts for technical information transmitted by Westinghouse.

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. CONCLUSION 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 2) of the Generic Letter 83-28, and is therefore acceptable.

REFERENCES

1. NRC Letter, D. G. Eisenhut to all Licensees of Operating Reactors, 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. Portland General Electric Company letter to NRC, Bart D. Withers, to Darrell Eisenhut, Director, Division of Licensing, " Generic Implications of Salem ATVS Events," November 4, 1983.

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