05000259/LER-1980-085-01, /01T-0:on 801123,river Temp Lowered Causing Differential Temp of Less than 5 F.Caused by Heavy Rainfall. Unit 3 Load Reduced & River Flow Increase Requested

/01T-0:on 801123,river Temp Lowered Causing Differential Temp of Less than 5 F.Caused by Heavy Rainfall. Unit 3 Load Reduced & River Flow Increase Requested

ML19345D324
Person / Time
Site:	Browns Ferry
Issue date:	12/05/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D322	List: 05000259/LER-1980-085, Forwards LER 80-085/01T-0 05000259/LER-1980-085-01, /01T-0:on 801123,river Temp Lowered Causing Differential Temp of Less than 5 F.Caused by Heavy Rainfall. Unit 3 Load Reduced & River Flow Increase Requested
References
LER-80-085-01T-01, LER-80-85-1T-1, NUDOCS 8012120506
Download: ML19345D324 (1)

LER-1980-085, /01T-0:on 801123,river Temp Lowered Causing Differential Temp of Less than 5 F.Caused by Heavy Rainfall. Unit 3 Load Reduced & River Flow Increase Requested

Event date:
Report date:
2591980085R01 - NRC Website

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1. 4(PQRTDATE ML' EVENT DCwHtPff 0*4 AND PROBABLE CONSEObENCES h lo!211 During steady state operation, heavv rainfall rapidiv Inwered the upstream river in ta) I temperature causing a differential river temperature of >5 F.

This d/t was a [Q l violation of Technical Specification E.T.S.2.1.

Previous occurrences

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go,3; l 78012, 80054, and 80073. There was no danger to the health and safety of the public.

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Downstream indicators were

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Unit 3 load was reduced, and river flow increase requested.

g l No further corrective action required.

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a Tennessee Valley Authority Form DF-17 Browns Ferry Nuclear Plant BF 15,2 i

1/10/79 LER SUPPLDIENTAL INFORMATION BFRO 259 / 8085 Technical Specification Involved E.T.S.2.1 Reported Under Technical Specification 5.6.3.b I

Date of Occurrence 11/23/80 Time of Occurrence 2030 Unit 0

Idantification and Description'of Occurrence:

Heavy rainf all ragidly lowered upstream river temperature causing river dif ferential

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temperature of >5 f.

g Condifons" Prior to Occurrence:

Unit 1@ 10 70 We.

Unit 2@ 217 We.

L' nit 3 3 899 We.

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Reduce waste heat discharged to the reservoir.

Apparent Cause of Occurrence:

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Heavy rainfall introduced a loe,alized large temperature decrease at one location upstream of plant. This caused average upstream temperature to decrease.

j Analysis of 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.afety of the public.

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Corrective Action

Increase in river flow requested and unit 3 load was reduced.

Cooling towers were winterized and not immedia&.ly available for operation.

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l Failure Data:

None r

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• Retention:

eriod - L.ifetime; Responsibility - Administrative Superviser

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