ML20064E678

/03L-0 on 781025:During Routine Startup Oper,Axial Flux Difference Deviated Greater than 5% from target.48 Penalty Min Accumulated.Caused by Xenon Transient Occurrence.Corrective Action:Boration by Reactor Operator

ML20064E678
Person / Time
Site:	North Anna
Issue date:	11/14/1978
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20064E676	List: ML20064E672 ML20064E678
References
LER-78-112-03L, LER-78-112-3L, NUDOCS 7811210294
Download: ML20064E678 (1)

Text

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i 8 60 61 DOCKET NUM8 ER EVENT DATE EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h M lDuring a routine startup operation. the nrial finy di f foranco devinPod eroneer 'Ph nn - l lM l 5% from target. A total of 48 penalty minutes was accumulated. Aerion Senremane n7 l l 0 l 41 l of T.S. 3.2.1 allows continued operation between 85% and 50% nower if Ph a nann 1Pv l l0 isl l accumulation.Is less than 60 minutes, therefore T'.S. 3.2.1 was not violated. This l 1016Ilevent is reportable as per T.S. 6.9.1.9.b. l l0l7ll l I

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_J@ 3/ 40 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i 10 l lThe cause of the AFD Deviation was a XenO t Transient which occurred durine startun I i l operation. Corrective action was a boration by the Reactor Ooerator which vn- I i, ; 7 g [ turned the AFD to within the target band. No further corrective action was I f ,T] l required. l i 4 l l 7 8 9 80 ST S  % POWE R oTHER STATUS DIS O Y DISCOVERY 0ESCRIPTION lt i5 l [C J@ l 0 l 7 l 5 l@l NA l l A l@l Operator Observation l A TiVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTivlTY LOCATION OF RELEASE R [zj@

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' Virginia Electric and Powar Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1

, Docket No. 50-338  !

i Report No. LER 78-112/03L-0  !

Description of Event:

On 10-25-78, during a routine start-up operation, the Axial Flux Differeact deviated. greater than - 5% from the target, a total of 48 penalty minutes was accumulated.

Action statement a.2 of T.S. 3.2.1 allows continued operation between 85% and 50% if the penalty accumulation is less than 60 minutes. Therefore,

, T.S. 3.2.1 was not violated. ,

This event is reportable as per T.S. 6.9.1.9.b.

Probable Consequences of Occurrence:

Su'rveillance of the Axial flux difference assures that the limits [

f. of the heat flux hot channel factor are not exceeded during normal operation

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or in the event of Xenon redistribution following power changes. This  ;

provides protection'against exceeding the DNBR and peak fuel clad temperatures.

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, Since the AFD was returned to its limit within the time allotted, l' there was no effect upon the safe operation of the plant. As a result, the public health and safety was not endangered.

a.

Cause of Occurrence:

4 The cause of the AFD deviation was a Xenon transient which occurred ,

during startup operations.

Immediate Corrective Action: ,

Corrective action was a boration by the reactor operator which returned 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 further action required. >

Actions Taken to Prevent Recurrence: l No further action required.

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