05000339/LER-1981-032-03, /03L-0:on 810418,auxiliary Shutdown Panel Indicators for Pressurizer Pressure & Level Declared Inoperable.Caused by Discrepancy W/Corresponding Control Room Instrumentation Due to Instrument Drift on Panel

/03L-0:on 810418,auxiliary Shutdown Panel Indicators for Pressurizer Pressure & Level Declared Inoperable.Caused by Discrepancy W/Corresponding Control Room Instrumentation Due to Instrument Drift on Panel

ML19347F130
Person / Time
Site:	North Anna
Issue date:	05/08/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347F128	List: 05000339/LER-1981-032, Forwards LER 81-032/03L-0 05000339/LER-1981-032-03, /03L-0:on 810418,auxiliary Shutdown Panel Indicators for Pressurizer Pressure & Level Declared Inoperable.Caused by Discrepancy W/Corresponding Control Room Instrumentation Due to Instrument Drift on Panel
References
LER-81-032-03L, LER-81-32-3L, NUDOCS 8105150307
Download: ML19347F130 (2)

LER-1981-032, /03L-0:on 810418,auxiliary Shutdown Panel Indicators for Pressurizer Pressure & Level Declared Inoperable.Caused by Discrepancy W/Corresponding Control Room Instrumentation Due to Instrument Drift on Panel

Event date:
Report date:
3391981032R03 - NRC Website

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O t1CtNSEE EvENr REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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/V/A/N/A/S/2/ (2)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On April 18, 1981, the auxiliary shutdown panel indicators for pressurizer

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pressure and pressurizer level were declared inoperable. The readings disagreed /

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with the corresponding control room instrumentation by more than the maximum

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acceptable variation during performance of the monthly channel check. The

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instrument indications were restored to acceptable limits within 7 days.

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As a result, the health and safety of the general public were not affected.

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This event is reportable pursuant to T.S. 6.9.1.9.b.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/I/E/ (11) LE/ (12) LE/ (13) /I/N/S/T/R/U/ (14) LIf (15)

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SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/C/ (18) LZ/ (19) g/ (20) LZ/ (21) /0/0/0/0/ (22) g/ (23) LN/ (24) LN/ (25) /W/1/2/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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This disagreement between instrument readings was caused by instrument drift

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on the auxiliary shutdown panel. Both of the affected indicators, which were /

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reading high, were replaced and the channels were satisfactorily recalibrated. /

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The auxiliary shutdown panel instrumentation channel check was then reperformed/

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j with acceptable results.

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FACILITY METHOD OF STATUS

%PGWER OTHER STATUS

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LE] (28)

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NA LB/ (31)

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SURVEILLANCE TESTING

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSLTES NUMBER TYPE DESCRIPTION (39)

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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LOSS OF CR DAMAGE TO FACILITY

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TYPE

DESCRIPTION

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PUBLICITY ISSUED DESCRIETION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894 5151 8105150307

T Virginia Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of 1 Docket No. 50-339 Report No. LER 81-032/03L-0

Description of Event

On April 18, 1981, the pressurizer pressure and pressurizer level indicators (PI-2444A and LI-2459C) disagreed with the corresponding control room instrument readings by more than the maximum acceptable variation. They were declared inoperable. This occurrence is contrary to the requirements of T.S. 3.3.3.5 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The operability of the remote shetdown instrumentation ensures that in the event control room habitability is lost, sufficient capability is available to permit shutdown of the facility to hot standby conditions from locations outside of the main control room. The auxiliary shutdown panel indicators were restored to operable status within 7 days as required by T.S. 3.3.3.5, the public health and safety were not affected.

Cause of Event

The disagreement between readings was caused by instrument drif t in both indicators on the auxiliary shutdown panel.

Immediate Corrective Action

The installed indicators for pressurizer pressure (PI-2444A) and pressurizer level (LI-2459C) were replaced and the associated monitoring channels were recalibrated. The auxiliary shutdown panel instrumentation channel check was then reperformed with satisfactory test results.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required.

Generic Implications There are no generic implications associated with this occurrence.