05000281/LER-1981-008-03, /03L-0:on 810206,output Amperage for RM-CC-106 Reduced in Nonconservative Direction.Caused by Failed Remote Indicator Module in Auxiliary Bldg.Module Isolated & RM-CC-106 Recalibr.Monitor Will Be Repaired

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/03L-0:on 810206,output Amperage for RM-CC-106 Reduced in Nonconservative Direction.Caused by Failed Remote Indicator Module in Auxiliary Bldg.Module Isolated & RM-CC-106 Recalibr.Monitor Will Be Repaired
ML18139B133
Person / Time
Site: Surry Dominion icon.png
Issue date: 03/02/1981
From: Joshua Wilson
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B131 List:
References
LER-81-008-03L-02, LER-81-8-3L-2, NUDOCS 8103060600
Download: ML18139B133 (2)
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LER-1981-008, /03L-0:on 810206,output Amperage for RM-CC-106 Reduced in Nonconservative Direction.Caused by Failed Remote Indicator Module in Auxiliary Bldg.Module Isolated & RM-CC-106 Recalibr.Monitor Will Be Repaired
Event date:
Report date:
2811981008R03 - NRC Website
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NRC FORM 366,.

(7,771 LICENSEE EVENT REPORT.

.UCI.E~R REGULATORY COMMISSION CONTROL BLOCK: I 10 IPLEASS PRINT OR TYPE ALL REQUIREC INFORMATION)

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! With Unit 2 operatin.g:*steady state.at 100%. power, a scheduled calibration of RM-CC-

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I 106 disclosed a failed remote indicator (in Aux. building) producing an error in

[))TI I RM-CC-106 output in a non-conservative direction.

Operating in. this condition, the L lirI] I Component eooling System's surge tank vent valves wouldn6t have automatically closed

[]JI} iat twice background as per T.S. 3.7, Table 3.z;-s.

Ibis event is re;portahJe ip *1

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DJ:Il. !The remote indicator module.failed resulting in a reduced output signal.

CIII] 1was isolated and RM-CC-106 was recalibrated.

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ATTACHMENT*, PAGE 1 of 1 SURRY POWER STATION, UNIT 2 DOCKET NO:

~0-281 REPORT NO:

81-008/03L-O EVENT DATE:

02-06-81 e

TITLE OF EVENT:

RADIATION MONITOR (RM-CC-106) ERRONEOUS SIGNAL

1.

DISCRIPTION* OF EVENT:

With Unit* 2 operating steady state at 100% power; a--scheduled-*cal**ibr*atiC>n* *-*--*--- -.. -. -

of R..'111-CC-106 disclosed a failed remote indicator* module (in Aux. Building) producing an error in the output of RM-CC-106 in a *non'-c-o*nservative d:Lrecfioff~- -----**......

Operating in this condition, the Component Cooling System's surge tank vent valves would not* have automatically closed at twice background *a:s-per-T~ S.

3.7, Table 3.7-5.

This event is reportable in* accordance with Tech. Spec. 6.6.2.b.(2)~

2 *. PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

The failed module resulted in a radiation reading less than actual (approximately 2/3 of actual). This would not prevent the Component Cooling System's surge tank vent valves cillosing automatically.

However, a. value slightly higher than the Tech. Spec. limit would have been required.

Thus*

the health and safety of the public were not affected.

3.

CAUSE

The remote indicator module for RM-CC-106 failed r~sulting_in reduced output amperage (displayed in counts per minute).

This output also supplies the alarm/valve actuation circuits*

4.

IMMEDIATE CORRECTIVE ACTION

The failed module was isolated fromt:the system and RM-CC-106 recalibrated.

Indication and alarm displays were still available_ in th.e.. controL room *. --

. --- -----~

5 *. SCHEDULED CORRECTIVE ACTION:

The failed monitor will be repaired and retw;ned..-to -sePTiee-. - - - ***-** --... ---* --*--------------

6.

ACTION TAKEN TO PREVENT RECURRENCE:.

None-

7.

GENERIC. Il1PLICATIONS :

This was considered a random event and possesses no generic implications.

--t.--..

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