ML20086H270

AO 50-271/72-08:on 721020,during Automatic Depressurization Sys B Logic Test,Relief Valve Initiation Time Delay Relay 2E-K5B Failed to Energize in 120 S.Relay Immediately Reset

ML20086H270
Person / Time
Site:	Vermont Yankee
Issue date:	10/26/1972
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086H274	List: ML20086H270 ML20086H275
References
AO-50-271-72-08, AO-50-271-72-8, VYV-2298, NUDOCS 8401160243
Download: ML20086H270 (2)

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SEVENTY SEVEN OROVE STRECT Run,AND, VERMONT 03701 VYV-2298 '- m P. O. BOX 157 VERNON, VERMONT oS354 26 October 1972 e j, ..

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Directorate of Licensing ., G-U.S. Atomic Energy Commission Washington, D.C.

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REFERENCE:

Operating License DPR-28 Docket No. 50-271 ~<.-

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Abnormal Occurrence No. A0-72-08 l

Dear Sir:

I As defined by Technical Specifications for the Vernont. Yankee Nuclear Power Station, Section 6.7.B.d, we are reporting the following abnormal '

occurrence as A0-72-08. j On October 20 during conduct of the Automatic Depressurization System

'B' Logic Test, the Relief Valve Initiation Time Delay Relay (No. 2E-K5B) failed to energize in < 120 seconds as required by a specification in Table 3.2.1 of Technien1 Specifications. At this time the reactor was operating i at approximately 50% power.

l The relay was immediately reset and was functionally tested and verified i to be operable at a time delay of 117 seconds. This remedial action was completed in a time span that precluded the necessity of further immediate

action. Investigation of the calibration records revealed that the time .

j delay of the relay in question was within specifications at the time of the j last surveillance test in April, 1972. There was no previous history of this I time delay relay being out of specification.

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Directorate of Licensing October 26, 1972 Page 2 The Plant Operations Review Committee concluded that although this was probably an isolated incident, and although the results of the calibration history review do not support a change in testing frequency, a single check of the timer would be conducted three months after the incident to confirm timer reliability.  :

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION e

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B.W. Riley Assistant Plant Superintendent DUE/rph i

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