ML19289C603

LER 78-135/03L-0 on 781226:axial Flux Difference Deviated Beyond Tech Spec Limit Due to Power Reduction Caused by Steam Leak in Drain Line of D Moisture Separator

ML19289C603
Person / Time
Site:	North Anna
Issue date:	01/16/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19289C595	List: ML19289C594 ML19289C599 ML19289C602 ML19289C603
References
LER-78-135-03L, LER-78-135-3L, NUDOCS 7901190114
Download: ML19289C603 (2)

Text

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[o ,,,; [During a power reduction, the Axial Flux Difference (AFO) deviated areater than +5" I gq [from the target for a 3 minute duration. This is contrary to T.S. 3.2.1. The AFD 1 g gwas returned to within the target band within the 15 minute allowance of the Action I g g atement. St This event is reportable as per T.S. 6.9.1.9.b. I UDD l I lo lil l I o s L OO I

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el 42 43 44 47 CAUSE DESCRIPitOfJ AND CORRECTIVE ACTIONS h i o lThe cause of the AFD deviation was a power reduction caused by a steam leak in the 1 i ,jidrain line of the "D" Moisture Separator. Corrective action was a mnual ro_d I g ; insertion by the operator which returned the AFD to within the tarcet hand. no i gq [further corrective action was required. j 12 14 11 1 7 8 9 03 STAT  % f*OM R OTHE R ST ATUS D15C i D!SCOVf HY Df ? Cit lPl .ON

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Attachment:

Page 1 of I Docket No. 50-338 Report No. LER 78-135/03L-0 Description of Event:

On 12-26-78, during a power reduction, the Axial Flux Difference deviated greater than -5!! from the target for a 3 minute duration. This is contrary to T.S. 3.2.1.

The AFD was returned to within the target band within the 15 minute allowance of the Action Statement. This event is reportable as per 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 was not endangered.

Cause of Occurrence:

The cause of the AFD deviation was a power reduction due to a steam leak on the drain line of the "D" Moisture Separator.

Immediate Corrective Action:

A manual rod insertion was completed by the reactor operator which returned the AFD to within the target band.

Scheduled Corrective Action:

No further corrective action was required.

Actions Taken to Prevent Recurrences:

No further action is required.

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