ML20084U032

LER BFRO-50-296/7620:on 761212,during Startup Testing, Drywell Temp Recorder TR-64-52 Became Erratic.Caused by Broken Thermocouple Lead Inside Junction Box Due to Loose Screw Causing Excessive Vibration

ML20084U032
Person / Time
Site:	Browns Ferry
Issue date:	01/10/1977
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-BFRO-50-296-762, NUDOCS 8306270018
Download: ML20084U032 (2)

Text

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EVENT OESCRIPTICr4 A j During startup testing drywell temperature recorder TR-64-52 became erratic.

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189 redundant indicator; TI-64-52, was operable. (BFRO-50-296/7620) l gl 60 l C9- I EI l 09 60 l

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TE] I 60 U9 mvE COMC.!";? CC'M*M SYSTEM CAUSE M ANCF aCT UMR VIOLATON SUNVEA COMPONENT CODE CODE 0]09l 10Il Dl W CODE lI lN lS lT l Rl Ul W 43 44 lXl9l9l9l47 [ NJ 48 11 12 e 17 CAUSE DESCR!PTION l

c] l The thermocouple lead was found broken inside the juncticn box and was connected. 63 09

'A loose set screw holdin2 terminal block in place nav l

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I M L, I ' I have n1] owed excessive vibration of thermoCo :plc leads.

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TENNESSEE VALLEY AUTHORITY , D 004

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Mr. Norman C. Moseley, Director 6 %&t,ecq NOf b U.S. Nuclear Regulatory Cormission L d h T22/ b -

Office of Inspection and Enforcement Region Il g N% '

230 Peachtree Street, NW. , 8th Floor N [ g' Atlanta, Georgia 30303

Dear Mr. Moseley:

TENNESSEE V UTHORITY - BROWNS FERRY NUCLEAR PLANT UNIT 3 -

DOCl3T NO. 50-296 FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-296/7620 The enclosed report is to provide details concerning the dr>vell temperature recorder TR-64-52 that became erratic during startup testing. This report is submitted in accordance with Browns Ferry Technical Specifications Section 6. This event occurred on Browns Ferry Nuclear Plant unit 3.

Very truly yours, TENNESSEE VALLEY AUTHORITY

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f'f H. S. Fox Director of Power Production Enclosure (3)

CC (Enclosure):

Director (3) '

Office of Management Information and Program Control-

, U.S. Nucicar Regulatory Commission Washington, D.C. 20555 Director (40)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 617 f

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