ML20064H205

LER#78-016/03L-0 on 780625:during Steady State Oper,Noted That Drywell Atmospheric Temp Recorder TR-1-149 Was Inoperable.Caused by Recorder Failure Due to Broken Cord on Chart Drive Mechanism

ML20064H205
Person / Time
Site:	Vermont Yankee
Issue date:	07/24/1978
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML20064H204	List: ML20064H197 ML20064H205
References
LER-78-016-03L, LER-78-16-3L, NUDOCS 7812180216
Download: ML20064H205 (2)

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• 71"7Y S1 05000271 LER 78-16/3L EVENT DESCRIPTION AND PROBA3LE CONSEQUENCES ,

During steady state operation, Control Room personnel observed the

• drywell at=ospheric temperature recorder, TR-1-149, to be inoperable.

This is one of two redundant drywell temperature recorders classified .

as post-accident instrumentation by Technical Specification Table 3.2.6 and is required for power operation. The redundant temperature recorder, 16-19-45, was available and operable.. Investigation revealed a broken cord on the chart drive mechanism.

'A similar occurence was reported as RO 76-30. (R0 78-16/3L)

CAUSE DESCRI? TION AND CORRECTIVE ACTION A General Electric Company Mod.el 8HG1A020ll recorder failed to oper-ata due to a broken cord on the chart drive =echanism. The drive cord r

, was replaced and the recorder was returned to ser rice on 6/26/78.

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