ML19276G917

LER 79-017/03L-0 on 790731:during Normal Operations, Containment Air Monitor Pump Found Inoperable. Caused by Corrosion Seizure of Vanes.Spare Pump Installed & Failed Pump Overhauled.Engineering Review in Progress

ML19276G917
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	08/23/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19276G912	List: ML19276G911 ML19276G917
References
LER-79-017-03L, LER-79-17-3L, NUDOCS 7908280616
Download: ML19276G917 (2)

Text

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VTVYS1 05000271 LER 79-17/3L EVENT DESCRIPTION AND PROBABLE CONSEOUENCES During normal reactor operations, the Operations Supervisor observed that the Containment Air Monitor (CAM) pump would not operate. During this time, flow through the CAM was being properly maintained by drywell to torus AP. The CAM pump was isolated and removed for overhaul at 0855 hours0.0099 days <br />0.238 hours <br />0.00141 weeks <br />3.253275e-4 months <br /> causing an interruption of flow to the CAM. The CAM was out of ser-vice until 1333 when a spare pump was installed and verified operable.

This situation was contrary to Tech. Spec. Section 3.6.C.2. Since the Dry-well Sump Systen was operable, con inued plant operation wr:s permitted in accordance with Tech. Spec. Section 3.6.C.2. During this event, there were no abnormal leakages detected by the sumps; therefore, the potential consequences to the health and safety were minimal. Similar occurrences were reported as R0 79-14, 77-33, 76-04 and 75-23.

CAUSE DESCRIPTION AND CORRECTIVE ACTION The CAM pump is a Conde Milking Machine Company Dri-Air Model No. 6, dry vane positive displacement pump.

Inoperability of the pump was due to the corrosion seizure of the vanes. A spare pump was installed and the failed pump overhauled. An Engineering review is in progress which is expected to lead to improve-ments of the reliability of the system.

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