ML20151C162

AO 73-28:on 730914,leakage Occurred from Reactor Bldg Closed Cooling Water Sys to Discharge Canal Via Svc Water Sys. Caused by Leaking Tubes in Reactor Bldg Closed Cooling Water Heat Exchanger 1-2.Investigation Continuing

ML20151C162
Person / Time
Site:	Oyster Creek
Issue date:	10/31/1973
From:	Reeves D JERSEY CENTRAL POWER & LIGHT CO.
To:
References
AO-73-28, NUDOCS 8103040842
Download: ML20151C162 (2)

Text

4 Preliminary

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' Abnomal Occurrence

H , Report No. 73-23 m: < -

• SUT.incr Leskage f' rom' the reactor building closed c'coling water system to the discharge canal via the service water systeq.

This cycnt is considered to to an nhnormal occurrence as defined in th( Technical Specifications, paragraph 1.15C. Notification '

of this event, as rec;uired by the Technical Specifications, para-grsph 6.6,2,a, was nede to ABC Region I, Directorate of Reguintory Operations, by telephone on Tmsday, October 30,-1973, at 1625, and by telecopior on Wedacsday, October 31,19/3; at 1605.

SITUATION: On Septerher 14, 1973, leakage into t c rcactor building closed

' cooling water systcm from a lesk in the fuc1 pool cooling system was identified and Isolated, As a result, the closed cooli,ng unter system activity wris knnlyzed on seveml occasions with the highest concentration calculated to be 1.9x10"* pC1/mi in a sample taken on Septorber 26,1973.- The activity was identified

, to be priterily Cst s" ed Cszu, q Plant personnel subsequently began investigating methods of re-

' mving the activity from the closed cooling water system, but these have not yet been impienented.

On October 19, 1973, leakage from the closed cooling water system was noted as Indicated by a decreasing icvel in the reactor building closed cooling wr.tcr sy.r. tem surge tant of up to 4-4,5"/hr (t'I .0 gpm) .

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H c Dd)$U: The cause of the release was leaking tubes in the #1-2 reactor i l

building closed cool.ing water heat exchangor.

h RafiDI AL ACJIO^1:

l Operations Iv.:rsonnel irrediately began isolating various com-ponents of the closed coolinz water system .in order to identify the source of leakage. As noted before, the rate of led. age from the system was conservatively estimated to be 1.0 gpm. On October 22, 1973, a sarpio of the closed cooling water system indicated a concentration of 6.3x10 5 pCl/m1, Indicating that

. lcakage had occurred during the period of Septerher 26, 1973 )

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through October 22, 1975. On October 29, 1973, RBCGi heat l'

exchanger'81-2 wr. identified as the couMe of leakage. Prior I

to this .date, there was not assurance that lenknge was to the environment. A sampic taken on October 30, 1973, following repairs to the heat exchanger, was analyned to be 2.5x10 ' uCi/ml.

SAFETY SIGNIFICANCE:

• A full investigation into the safety significance is now under-way. It is apparent, howcycr, that the release rate of liquid j effluents into the dischargo' canal was significantly below the concentrations given in Appendix B, Tabic II, Cohr:n D, .)f 10CFR20. (100tF20 limits aro 9x10'8 pCi/ml for Cs"* and i

2x10-5 pCi/mi for. Cs"7.) .

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