05000339/LER-1980-102-03, /03L-0:on 801218,axial Flux Difference Deviated Above Target.Caused by Increasing Reactor Power During Startup W/Effects of Xenon Burnout.Rods Borated Out to Restore Axial Flux Difference to within Target Band

/03L-0:on 801218,axial Flux Difference Deviated Above Target.Caused by Increasing Reactor Power During Startup W/Effects of Xenon Burnout.Rods Borated Out to Restore Axial Flux Difference to within Target Band

ML20002D310
Person / Time
Site:	North Anna
Issue date:	01/14/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20002D309	List: 05000339/LER-1980-102, Forwards LER 80-102/03L-0 05000339/LER-1980-102-03, /03L-0:on 801218,axial Flux Difference Deviated Above Target.Caused by Increasing Reactor Power During Startup W/Effects of Xenon Burnout.Rods Borated Out to Restore Axial Flux Difference to within Target Band
References
LER-80-102-03L-01, LER-80-102-3L-1, NUDOCS 8101200355
Download: ML20002D310 (2)

LER-1980-102, /03L-0:on 801218,axial Flux Difference Deviated Above Target.Caused by Increasing Reactor Power During Startup W/Effects of Xenon Burnout.Rods Borated Out to Restore Axial Flux Difference to within Target Band

Event date:
Report date:
3391980102R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION v

LICENFEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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

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On December 18, 1980, during a routine startup operation, the axial flux

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difference deviated greater than 5% from the target for a 5 minute duration.

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Action Statement a.2 of T.S. 3.2.1 allows continued operation between 81% and /

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50% power if the penalty accumulation is less than 60 minutes, therefore

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T.S. 3.2.1 was not violated and the health and safety of the general public

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were not affected. 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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SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT 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 LX/ (18) LZ/ (19) g/ (20) /_Z/ (21) /0/0/0/0/ (22) g/ (23) /N/ (24) g/ (25) /Z/9/9/9/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The AFD deviation was caused by increasing reactor pwer during startup with

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effects of xenon burnout. Corrective action was to restore the AFD to within /

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the target band by borating rods out.

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FACILITY METHOD OF STATUS

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LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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LOSS OF OR DAMAGE TO FACILITY G3)

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 810.1200355

Virginia Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of 1 Docket No. 50-339 Report No. LER 80-102/03L-0

Description of Event

On December 18, 1980, during a routine startup operation, the Axi'l Flux Difference (AFD) deviated greater than 5% from the target for a total cumulative penalty of 5 minutes. Action Statement a.2 of T.S.

3.2.1 allows continued operation between 81% and 50% power if the penalty accumulation is less than 60 minutes, therefore T.S. 3.2.1 was not violated. This occurrence is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence Surveillance of the axial flux difference assures that the limits of the heat flux hot channel factor are not exceeded during normal operation or in the event of xenon redistribution following power changes.

This provides protection against exceeding the DNBR and peak fuel clad temperatures. Since the AFD was returned to its limit within the time allotted, there was no effect upon the safe operation of the plant. As a result, the public health and safety were not affected.

Cause of Event

The AFD deviation was the result of xenon effects coincident with an increase in power during the startup operation.

Immediate Corrective Action

Corrective action was to borate and withdraw rods to bring the AFD to within the target band. Close surveillance of the AFD continued until the plant was returned to full power.

Scheduled Corrective Action No scheduled action is required.

Actions Taken to Prevent Recurrence No further actions are required.

Generic Implications None.

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