ML20062A380

/03L-0 on 780904:backflow of Radioactive Liquid from Radwaste Demineralizers to Svc Air Sys Discovered on 780904 & 780921.Caused by Leaking Process Valves & Associated Check Vlaves Due to Dirt Deposits

ML20062A380
Person / Time
Site:	Peach Bottom
Issue date:	10/04/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20062A378	List: ML20062A374 ML20062A380
References
LER-78-039-03L, LER-78-39-3L, NUDOCS 7810130163
Download: ML20062A380 (1)

Text

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, ' Unit'2 LICENSEE EVENT REPORT Rsport Ns. 2-78-39/3L-0 CONTROL BLOCK: l 1

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(PLE ASE PRINT OR TYPE Att REQUIRED INFORMATION) _

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JO 67 CAT SS 7 8 LICENSEE COD; l4 CON'T O i ,"g Ql 0 l 5 l0 l- l0 l2 17 17 l@l0 19EVENT 68 67 10DATE l4 l7 l8 l@l1101Ol4l7Ia!h 74 ?S REPORT 0 ATE 80 7 8 60 61 DOCKET NUV9ER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h O 2 l A backflow of radioactive liquid from ra 6.ste system demineralizers to I O 3 l the service air system occurred on 9/4/78 and 9/21/78. Service air is __J l0 l4 l l used at times to supply breathing for workers performing maintenance in l-gl areas with high airborne contamination. At the time of the occurrences l lO ls l l no such work was in progress. Breathing air supply equipment filters 1 Rl were checked for contamination. No contamination was found. Safety l l 0 is l l significance is minimal. 30 l

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J3 34 3b 36 3# 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h yl Process valves and associated check valves between the service air l gl system and demineralizers in the radwaste system leaked due to dirt l

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pgg deposits. The valves were dismantled and cleaned. New internals were l gl installed in the process ball valves. A modification was made to provide l g alarm and automatically isolated service air during backflow situations. ]

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$ ANS  % POWE R OTHER S f ATUS ISCO RY DISCOVERY DESCRIPTION 1 5 [Ej@ l 0 l 8 l 9 l@l Unit 3 1007 l W @l Operable Observation I ACTIVITY CO TENT '

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