ML20236L530

PNO-77-003:on 770105,licensee Reported That an Unplanned Release of Radioactive Liquid Was Discharged to Wheeler Reservoir,Due to Leak in Heat Exchanger in RHR Sys While in Shutdown Cooling Mode

ML20236L530
Person / Time
Site:	Browns Ferry
Issue date:	01/06/1976
From:	Gower G, Roy G, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-003-01, PNO-77-3-1, NUDOCS 9807130055
Download: ML20236L530 (1)

Text

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• PRELIMINARY NOTIFICATION 4 >

,, January 6, 1976 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE-PNO-77-03 This preliminary notification constitutes EARLY notice of an~ event of POSSIBLE safety or public interest significance. The information presented is as initially received without verification pr evaluation 3

and is basically all that is known by IE staff on this ddte.

Facility: Tennesse Valley Authority Browns Ferry Unit No. 1 (DN 50-259) ,

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l Subj ect:

UNPLANNED RELEASE OF CONTAMINATED WATER TO UNRESTRICTED AREAS on 1/5/77 the licensee reported that an unplanned release of radioactive  !

liquid was discharged to Wheeler reservoir due to a leak in a heat exchanger  :

I in the RHR system while in the shutdown cooling mode. The raw water flow -

rate to the reservoir was 7000 gpm. The release occurred over a six hour period ending at 2:00 a.m. on 1/5. Initial information indicates that this 05 discharge exceeded the instantaneous concentration limit specified in the ,

plant technical specifications for Iodine-131 by a factor of 240 and Iodine-133 by a factor of 40. The average annual concentration discharge .

limits specified in 10 CFR 20 were not exceeded.  ;

i Investigation and additional monitoring is still in progress. State of Alabama has been informed by TVA and IE:II and based on the States' pre-liminary evaluation they do not plan to take any protective action. 3

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A press release has been issued by the licensee.

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Region II (Atlanta) received notification of this occurrence by telephone /  ;

from an IE:II inspector onsite at 2iOO p.m. on 1/5/77.  !

contact: GCGower, IE x27261 GWRoy, IE x27261 DThompson, IE x27541 d) i 4 j Distribution: O Chairman Rowden Commissioner Mason Commissioner Gilinsky C. C. Kammerer, CA S. J. Chilk, SECY G. F. Murphy, JCAE k'

Commissioner Kennedy ,

L. V. Gossick, EDO K. R. Chapman, NMSS R. G. Ryan, OSF j

S. H. Hanauer, EDO E. Volgenau, OIE J. A. Harris, PA B. C. Rusche, NRR H. K. Shapar, ELD- T. J. McTiernan, 01A Transmitted: PBldg 9  ; H St.y  ; MNBB9  ; Luge  ;

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PRELD'INARY NOTIFICATION l .?: 4 ?r.c/ta :8 9 : w 9807130055 760106 PDR I&E ~

PNO-77-003 PDR J