ML19225A843

LER 79-021/03L-0 on 790615:during Normal Operation, Containment Atmosphere Particulate Monitor Twice Failed Low. Monitor Corrected & Returned to Svc

ML19225A843
Person / Time
Site:	Calvert Cliffs
Issue date:	07/13/1979
From:	Lagiewski J, Miernicki M BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19225A841	List: ML19225A840 ML19225A843
References
LER-79-021-03L, LER-79-21-3L, NUDOCS 7907200409
Download: ML19225A843 (2)

Text

NRC FORM 066 U. S. NUCLEAR REGULATORY CCMMISSION (7 77)

• LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL RECUlRED INFORMATION)

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' 3 COCKET NUVSER EVENT DESCRIPTloN AND PRC8ABLE CCNSECUENCES h a l Durino normal coeration the Control Recm Ocerator discovered the containrent I o a l atmosphere carticulate monitor failed low at 0850 and acain at 0100 on 6/16/79. I o 64 i Folicwing corrective action the monitor was returned to service at 1630 on 6/15/79. I o 31 I and again at 0945 on 6/19/79.

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The containrrent at-oschere caseous radioactivity I a 6s monitorina system and contairrent sumo alam system remained ocerable throLahout I ai7  ! tnese events. This is not a recetitive occurrence. I losa l 1 30 7 aa SYSTE M CALSE CALSE CCVP. VA uv e COCE COOE . BCCCE COV7CNENT COCE SLBCOCE SLSCOCE 7

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LER 79-21/3L DOCXET NO. 50-318 EVENT DATE 6-15-79 REPORT DATE 7-13-79 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

It was discovered that the detector pig contained some moisture prcbably due to a steam leak near the sensing line. The containment sample point was shifted, the pig was dried out, and the moni*wr was returned to service. Shortly thereafter, the detector tube failed possibly j as a result of the moisture damage. A new detector tube was installed and the monitor again returned to service. The steam leak is scheduled to be repaired during the next few weeks, altncugh the shift in the detec'wr samoling point seems to have solved the moisture problem. (Westinghouse Model 1345 P/N 2372A80-H01) .

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