05000271/LER-1980-006-01, /01T-0:on 800122,received Low Flow Alarm on Off Gas Sampling Sys.Flow Disturbance Rendered Both Radiation Monitors 17-150A & B Inoperable.Apparently Caused by Flow Blockage.Flow Increased,Clearing Blockage

/01T-0:on 800122,received Low Flow Alarm on Off Gas Sampling Sys.Flow Disturbance Rendered Both Radiation Monitors 17-150A & B Inoperable.Apparently Caused by Flow Blockage.Flow Increased,Clearing Blockage

ML19262C274
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	02/04/1980
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19262C271	List: 05000271/LER-1980-006, Forwards LER 80-006/01T-0 05000271/LER-1980-006-01, /01T-0:on 800122,received Low Flow Alarm on Off Gas Sampling Sys.Flow Disturbance Rendered Both Radiation Monitors 17-150A & B Inoperable.Apparently Caused by Flow Blockage.Flow Increased,Clearing Blockage
References
LER-80-006-01T, LER-80-6-1T, NUDOCS 8002080525
Download: ML19262C274 (2)

LER-1980-006, /01T-0:on 800122,received Low Flow Alarm on Off Gas Sampling Sys.Flow Disturbance Rendered Both Radiation Monitors 17-150A & B Inoperable.Apparently Caused by Flow Blockage.Flow Increased,Clearing Blockage

Event date:
Report date:
2711980006R01 - NRC Website

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VTVYS1 05000271 LER 80-6/lT EVETT DESCRIPTION AND PROBABLE CONSEQUDICES At approximately 0830, January 22, 1980, Operations personnel re-ceived a low flow alarm on the Off Gas Sampling System.

Immediate in-vestigation by cognizant plant personnel determined that a flow distur-bance had occurred in the Sampling System rendering both AEOG Radiation Monitors 17-150A&B inoperable.

This condition wcs contrary to the re-quirements of Tech. Spec. Table 3.2.4.

The necessity to perform the action specified in Note 2 of Tech. Spec. Table 3.2.4 was precluded by restoring operation of the AEOG Radiation Monitors 17-150A&B within ap-proximately twenty minutes from event initiation.

Based upon a review of Off Gas System sa=ples obtained directly following this event, it was concluded that no abnormal activity at the SJAEs occurred and that there were no adverse consequences fo the public health or safety as a result of this event. A similar occurrence was reported as RO 79-02.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS The investigation into the low flow of the SJAE's Off Gas Sampling System resulted in the determination that the apparent cause of the event was due to a flow blockage. The ic=ediate corrective action con-sisted of increasing flow through the sampling system's components and clearing the blockage.

The metering valve was then adjusted for normal flow and satisfactory operction of the AEOG Radiation Monitoring System was verified. No additional corrective action is envisioned at this time.

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