05000260/LER-1981-005-03, /03L-0:on 810119,core Max Fraction of Limiting Power Density Exceeded Limit for One Node in Core.Caused by Operation Close to Limit in Conjunction W/Minor (Normal) Perturbation in Monitored Parameters.Power Reduced Slightly

/03L-0:on 810119,core Max Fraction of Limiting Power Density Exceeded Limit for One Node in Core.Caused by Operation Close to Limit in Conjunction W/Minor (Normal) Perturbation in Monitored Parameters.Power Reduced Slightly

ML20003B236
Person / Time
Site:	Browns Ferry
Issue date:	02/06/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003B229	List: 05000260/LER-1981-005, Forwards LER 81-005/03L-0 05000260/LER-1981-005-03, /03L-0:on 810119,core Max Fraction of Limiting Power Density Exceeded Limit for One Node in Core.Caused by Operation Close to Limit in Conjunction W/Minor (Normal) Perturbation in Monitored Parameters.Power Reduced Slightly
References
LER-81-005-03L, LER-81-5-3L, NUDOCS 8102100539
Download: ML20003B236 (2)

LER-1981-005, /03L-0:on 810119,core Max Fraction of Limiting Power Density Exceeded Limit for One Node in Core.Caused by Operation Close to Limit in Conjunction W/Minor (Normal) Perturbation in Monitored Parameters.Power Reduced Slightly

Event date:
Report date:
2601981005R03 - NRC Website

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REPOR T Q ATE to EV ENT DESCntPTION AND PROB ABLE CONSECUENCES h 10 ! 21 1 During normal operation core maximum fraction of limiting power density exceeded l

[o 131 ! limit by 0.002 for one node in core. Discovery was made by review of necn ec=puter i

I o 14 J l edit at approximately 1430. No redundant system. Power was reduced approxi=ately i

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I lilil i certurbation in monitored paraceters such as recire. flow.

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[ie 1 i reduced shortly after discoverv to prevent short term recurrence. A proposed i

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l T0nr.est;ec Valley Authority Form DF-17 drowns Ferry Nuclear Plant BF 15.0 1/10/79 Li?.R SUPPLEMENTAL INFORMATION iiFPn 50- 260 / 81005 Technical Specincation involved 3.5.J and 3.5.L Repuried Under Technical Specification 6.7.2.b(2)

Date 4 Occurrence 1/19/81 Time of Occurrence 1200 Unit 2

Idennfiention and Description of Occurrence:

Core maximum fraction of limiting power density exceeded limit by 0.002 for one node in core. Discovery was made by review of noon computer edit at approximately 1430.

nnditiens Prior to Occurrence:

Unit 1 @ 98%

Unit 2 @ 99%

Unit 3 @ 23%

Acti.>n specified in the Technical Specification Surveillance Requirements met due o moperable equipment. Describe.

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, lop._;nt Cause of Occurrence,:

Operation close to a limit in. conjunction with minor (normal) perturbation in monitored parameters such as recirculation flow.

Angl;,i., pf Occurrence:

There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no danger to the health or safety of the public.

Corr + im Action :

Power was slightly reduced shortly af ter discovery to prevent short term recurrence.

Rod pattern adjustment may be necessary to prevent long term recurrence. A ~

proposal is being made to remove power spiking penalty on 8 x 8 fuel.

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Period - Lifetime; Responsibility - Administrative Supervisor 6Revi,.n: la