ML19256A703

LER 78-034/03L-0 on 781205:air Ejector Off Gas Monitor a Was Behaving Erratically Drawing Excessive Traces.Condition Could Not Be Reproduced & Cause Is Undetermined.Test Instruments Checked Out Normal

ML19256A703
Person / Time
Site:	Vermont Yankee
Issue date:	01/04/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256A700	List: ML19256A699 ML19256A703
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 7901090225
Download: ML19256A703 (2)

Text

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N AYE OF PHEPAHER

VTVYS1 05000271 LER 78-34/3L EVENT DESCRIPTION AND PROBABLE CONSEOUENCES During steady state operation, Control Room personnel observed the Air Ejector Off Cas Monitor "A" behaving in an erratic manner drawing excessively hi;;h traces. The Chemistry and llealth Physics Department was notified and verified that this monitor was providing inaccurate infor-mation. This condition is contrary to Technical Specification 3.2.D.

The monitor was replaced with a spare unit and the channel was declared operable. Since the redundant Off Gas Monitor "B" was availabic and op-erable and of f Gas Mor.itor "A" was out-of-service for less than twenty hours, there were no adverse consequences to the public health or safety as a result of this event. There were no previously reported similar occurrences.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS The apparently failed monitor was subsequently checked-out and all attempts to reproduce the above described responses were unsuccessful.

In addition, all instrument checks proved satisf actory. Therefore, the cause of the failure could not be identified. No further corrective action was determined necessary.

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