ML20084T932

LER BFRO-50-259/7612W:on 760721,raw Svc Water Tank Level Switch Stuck & Prevented Start of Raw Svc Water Pump,Causing Tank to Drain Below Tech Spec Limits.Caused by Slight Shifting of Operating Mechanism

ML20084T932
Person / Time
Site:	Browns Ferry
Issue date:	08/11/1976
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-BFRO-50-259-761, NUDOCS 8306240292
Download: ML20084T932 (2)

Text

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[PLEASE PftlNT ALL REGUIRED INFORMATION)

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[ l l l l l l 74 75 80 EVtt4T DESCHIPTION BE l A raw service water tank level switch became stuck and prevented the start of a raw l 7 89 80

$ l service water pump. This . aused the tank to be drained below the minimum 1cvel 7 89 l 60 8 1 speci fied in the Technient Seccifications.

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[ N_j 7 89 10 11 12 17 43 44 48 CAUSE DESCRIPTION

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@ l A Mercoid-type 251-CMP-S13Y-S11% level switch became stuck due to slight shifting 7 89 l 80 l l

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@ lof the operating mechanism. The mechanism was adjusted to prevent binding and the 7 89 l 80 L

f DE lsvitch was returned to service _

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's t A tus' s Powen otsta STArus orsCovtav 1 y l0l0l0l12 l13 N/A l W l 0SCOVERY DESCA@TCN Alarms received in control room l 7 8 9 10 44 45 46 80 S0 OF ASE AMOUNT OF ACTMTV 7 8 W

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13 PERSONNEL INJURIES 80 Nuunin otsCArroN H l0l OI Ol l N/A 7 89 11 12 l 80 OFFSITE CONSEQUENCES

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o. TENNESSEE VALLEY AUTHORITY O as7 7H2-c [r. .? CHATTANOOGA, TENNCSSEE 37401 / '-

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. IE FILE COPY p August 1 1 , 15776 3 73 .

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Mr. Ilortan C. Hosoley, Director ,

k U.S. Huclear Regulatory Ccx:.:.dssion ^p p Region II 230 Peachtree street, tu., 8th Floor Atlanta, Geor ;ta 30303

Dear Mr. Moseley:

TETIESSES VALLEY AUTEORITY - B%h.7IS FERRY UUEU1 PIANT LRTIT 1 -

DOCKET NO. Sv-259 - ?ACILrff OJEP.ATIHG IIC12EE DPR REFORTABLE OCCURRCTCE R". 0RT BFRO-50-259/7612W The enclosed report is to provide detaila concerning a raw service water tank 1 cycl switch which becar.o stuck and prevented the start of a rau service water Iuap ana ia su'mitted in accordance with Appendix E to Regulatory Guide 1.16, Revision 4,oAu wt lifl5. Ulis event occurred on Brovna deny nuclear Plant unit 1.

Verf truly yours, TEEfB3SE3 VALLEY AUIHORITY M. D. Fox Director of Fower Production .

Enclosure (3)

CC (Enclosure):

Director (3) e Office of ihnagement Infor::ation and Progra.a Control U.S. Nuclear Regulatory Cecnisalon Washington, D.C. 20555 Director (lKs)/

OITice of Inspection and Enforcement JEFILE COPY U.S. Nuclear Ro@ tory Coa: mission Washington, D.C. 2L555 /

f'OPY SENT REGIO 8252 An Equal Opportunity Employer G

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