05000280/LER-1979-014-03, /03L-0 on 790422:liquid Waste Disposal Radiation Monitor Failed to Give High Alarm & Trip Release Valve. Caused by Instrument Drift in High Alarm Setpoint.All Liquid Waste Releases Were Secured & Alarm Board Checked

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/03L-0 on 790422:liquid Waste Disposal Radiation Monitor Failed to Give High Alarm & Trip Release Valve. Caused by Instrument Drift in High Alarm Setpoint.All Liquid Waste Releases Were Secured & Alarm Board Checked
ML18114A601
Person / Time
Site: Surry 
Issue date: 05/22/1979
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18114A599 List:
References
LER-79-014-03L-01, LER-79-14-3L-1, NUDOCS 7905250150
Download: ML18114A601 (2)
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LER-1979-014, /03L-0 on 790422:liquid Waste Disposal Radiation Monitor Failed to Give High Alarm & Trip Release Valve. Caused by Instrument Drift in High Alarm Setpoint.All Liquid Waste Releases Were Secured & Alarm Board Checked
Event date:
Report date:
2801979014R03 - NRC Website
v • d • e

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I (Attachment, page 1 of A Surry Power STation, Un'W' 1 Docket No: 50-280 Report No: 79-014/03L-0 Event Date:

4-22-79 Title:

Radiation Honitor ~f-LW-108 Half unction

1.

Description of Event

The Liquid Waste Disposal Radiation monitor RM-LW-108 failed to give a high

.alarm signal to trip the effluent discharge valve FCV-LW-104A and terminate a liquid release.

This event is contrary to Technical Specification Table *3_7~5 (Alarm Setpoint). It is reportable as per Technical Specification 6.6.2.B.4.

2.

Probable Consequences and Status of Redundant Systems:

The release limits delineated in Technical Specification*3.ll.A (10CFR20 App. B) were not exceeded.

Therefore, the health and safety of the public were not affected.

The redundant discharge tunnel monitor was operable and verified no significant release occurred.

3.

Cause

The failure of the radiation monitor alarm* signal,;,ras caused by instrument drift in the high alarm setpoint.

At no time were the limits of 10CFR.20, Appendix B, or Technical.Specification 3.11.A.l exceeded.

4.

Immediate Corrective Action

All liquid waste releases were secured.

The alarm board was calibrated and checked.

The monitor was returned.to service.

5.

Subsequent Corrective Action:

None considered necessary.

6.

Actions Taken to Prevent Recurrence:

No further corrective action is required.

7.

Generic Implications None

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