ML19256A967

LER 79-002/01P-0 on 780111:flow Disturbance Occurred in Sampling Sys to the Extent That Radiation Monitors Were Inoperable.Caused by Possible Flow Blockage in Sample Sys Component.Corrective Action Rept Will Follow

ML19256A967
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	01/11/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256A961	List: ML19256A960 ML19256A967
References
LER-79-002-01P, LER-79-2-1P, NUDOCS 7901170203
Download: ML19256A967 (2)

Text

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/ . VTVYS1 05000271 LER 79-2/IP EVENT DESCRIPTION AND PROBABLE CONSEOUENCES During the routine performance of obtaining an Of f Gas System sample, the Control Room located recorder for the AEOG Radiation Monitors 17-150A&B exhibited anomalous indications. Immediate investigation by cognizant plant personnel determined that a flow disturbance had occurred in the sampling system utilized by both radiation monitors. Furthermore, it was determined that until sampling system flow conditions could be returned to normal, both radiation monitors were inoperable. This condition was determined to be contrary to the requirements of T.S. Table 3.2.4 and prep-arations for an orderly reactor shutdown were initiated. The necessity to perform the action specified in Note 2 of T.S. Tabir .2.4 was precluded by restoring operation of the AEOG Radiation Monit. .c 17-150A&B within ap-proximately one hour from event initiation. Based upon a review of Off Gas System samples obtained during and directly following this event, it was concluded that as abnormal activity at the SJAE's occurred and that there were no adverse consequences to the public health or safety as a result of this event. There were no previous reportable occurrences of this type.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Preliminary investigation indicates that the cause of this event may be related to a flow blockage in one of the sample system compenents.

Additional details of the cause description ara a summary of corrective actions taken will be provided in the follow-up >:cport.