05000293/LER-1979-004-03, /03L-0 on 790120:plant Stack Process Radiation Monitoring Sys Failed.Caused by Sample Line Freezing

/03L-0 on 790120:plant Stack Process Radiation Monitoring Sys Failed.Caused by Sample Line Freezing

ML19259B493
Person / Time
Site:	Pilgrim
Issue date:	02/12/1979
From:	Mathis C BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19259B492	List: 05000293/LER-1979-004, Forwards LER 79-004/03L-0 05000293/LER-1979-004-03, /03L-0 on 790120:plant Stack Process Radiation Monitoring Sys Failed.Caused by Sample Line Freezing
References
LER-79-004-03L, LER-79-4-3L, NUDOCS 7902260410
Download: ML19259B493 (1)

LER-1979-004, /03L-0 on 790120:plant Stack Process Radiation Monitoring Sys Failed.Caused by Sample Line Freezing

Event date:
Report date:
2931979004R03 - NRC Website

text

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'40 EVENT DFSCRIPTION AND PROHACLE CONSEQUENCES h lo l2l l On January 29, 1979 at 1220 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.6421e-4 months <br />. the Plant Stact: Precessm"utdiati nn unnitoritw I

System failed as ir.dicated by "Ai/Lo Suc tion Flow to Stack Gas Sample Pomp" an-nunciation i.n the Control Room.

Repairs were instituted immediately and when af ter j one hour repairs hel not been completed, a controlled shutdown was initiated as j

l o I61 L_equired by T.S. and terminated when the sample system was returned to service.

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101al itI l-l 01 21 22 23 74 26 21 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHVENT NPR D.4 PRIVE COYP.

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A0 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l Investigation revealed the sanole line was frozen. The sannle line was fraed with i

o heat and system returned to normal. Heat tape has been annlied to rho m ~,1n linn i i to prevent future occurrences.

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