ML20214N970

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Informs That Due to Problems W/Mechanical Overspeed Trip, 860821 Mod to Remove Electrical Overspeed Trip Reevaluated. Problems Identified During Setpoint Verification Testing. Electrical Overspeed Trip Will Remain Operational
ML20214N970
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 11/24/1986
From: Lindblad W
PORTLAND GENERAL ELECTRIC CO.
To: Varga S
Office of Nuclear Reactor Regulation
References
TAC-60783, NUDOCS 8612040032
Download: ML20214N970 (1)


Text

PORTLANn GENEHAL ELEcTurc COMPANY 121 S. W. S A LM o N STREET WILLI AM J. LIN DB LAD PO RTLAN o, O R coon 97204 1503)220-8875 November 24, 1986 Trojan Nuclear Plant Docket 50-344 License NPF-1 Director of Nuclear Reactor Regulation Attn: Mr. Steven A. Varga Director, PWR-A Project Directorate No. 3 U.S. Nuclear Regulatory Commission Washington DC 20555

Dear Mr. Varga:

Auxiliary Feedwater System Our letter of August 21, 1986 provided status on a list of modifications to be made to the Auxiliary Feedwater (AFW) System. One planned modification, removal of the electrical overspeed trip (Item B.2), was being reevaluated due to problems with the mechanical overspeed trip. The problems were identified during setpoint verification testing and resulted in disassembly and overhaul of the trip mechanism.

Considering these recent difficulties and the fact that the electrical overspeed trip has not been a cause of spurious trips at the Trojan Plant, it appears prudent not to perform the modification. Therefore, the electrical overspeed trip will remain operational to provide greater assurance of AFW overspeed protection.

Sincerely, S

f. .

- A f ~f n

- g c: Mr. John B. Martin (2 copies)

Regional Administrator, Region V U.S. Nuclear Regulatory Commission Mr. Lynn Frank, Director State of Oregon Department of Energy 8612040032 861124 PDR P

ADOCK 05000344 PDR gDO I 1 O

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