ML19294C050

LER 80-022/03L-0:on 800208,during Control Rod Insertion, Indicated Quadrant Power Tilt Twice Exceeded 1.02%.Caused by Rod Insertion to Perform Flux Map.Reactor Flux Map & Control Rod Withdrawal Performed

ML19294C050
Person / Time
Site:	North Anna
Issue date:	03/03/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19294C044	List: ML19294C043 ML19294C050
References
177, LER-80-022-03L, LER-80-22-3L, NUDOCS 8003060585
Download: ML19294C050 (2)

Text

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4F CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o ]Ihe cause of the indicated tilt was a rod insertion to perform a flux mao. Correctivet g l action was the performance of a reactor flux-map and a stibsequent control rod with - I i 2 Idrawal. The flux-map indicated that the tilts were less than 1. 02 %. No fu rthe r I

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NAME OF PREPARER W. R. Cartwright PHONE: (703) M2-5151

Virginia Electric and Power Company

Attachment:

Page 1 of 1 North Anna Power Station, Unit #1 Docket No. 50-338 Report No. R0-LER 80-22/03L-0 Description of Event:

On 2-8-80 while at 100% power an indicated quadrant power tilt in~ excess of 1.02% occurred twice. These events are contrary to T.S. 3.2.4. The indicated tilts were restored to less than 1.02% within the 2-hout time allowance of the appropriate ACTION statement. This event is reportable as per T.S. 6.9.1.9.b and there are no generic implications.

Probable consecuences of Occurence:

The quadrant power tilt ratio limit assures that the radial power distribution satisfies design values used on the power capability during analysis. Since the indicated tilts were restored to within their limit during the allotted time, there was no adverse effect upon the safe operation of the plant and the health and safety of the general public were not affected.

Cause of Event:

The cause of the indicated tilt was a rod insertion. This was due to a reactor flux adjustment to perform a flux-map.

Immediate Corrective Action:

The control rods were withdrawn upon the completion of the flux-map which resulted in the indicated tilt being restored to within the 1.02% limit.

Further Corrective Action:

The flux-map results indicated that the incore quadrant power tilt was less than 1.02%. The nuclear instrumentation detectors were then calibrated to agree with the incore.results.

Actions Taken to Prevent Recurrence:

No further corrective action was required.