05000259/LER-1980-054-04, /04T-0:on 800706,during Normal operation,U-2 & U-1 Were Placed on Cooling Towers.Temp Continued to Rise. River Temp Peaked at 90.2 F & Then Declined.Caused by Inaccurate River Temp Predictions Due to Solar Heating

/04T-0:on 800706,during Normal operation,U-2 & U-1 Were Placed on Cooling Towers.Temp Continued to Rise. River Temp Peaked at 90.2 F & Then Declined.Caused by Inaccurate River Temp Predictions Due to Solar Heating

ML19330A861
Person / Time
Site:	Browns Ferry
Issue date:	07/18/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19330A857	List: 05000259/LER-1980-054, Forwards LER 80-054/04T-0 05000259/LER-1980-054-04, /04T-0:on 800706,during Normal operation,U-2 & U-1 Were Placed on Cooling Towers.Temp Continued to Rise. River Temp Peaked at 90.2 F & Then Declined.Caused by Inaccurate River Temp Predictions Due to Solar Heating
References
LER-80-054-04T, LER-80-54-4T, NUDOCS 8007290664
Download: ML19330A861 (2)

LER-1980-054, /04T-0:on 800706,during Normal operation,U-2 & U-1 Were Placed on Cooling Towers.Temp Continued to Rise. River Temp Peaked at 90.2 F & Then Declined.Caused by Inaccurate River Temp Predictions Due to Solar Heating

Event date:
Report date:
2591980054R04 - NRC Website

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M 31 40 el of 4J Aa CAUSE DESCRIPTION Ar4D CoF181tCTIVE ACif 0NS h y g the cause is that the river temperature preductions were not accurate, diin to solar heating.

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Tennessea Valley Adthority Browns Ferry Nuclear Plant p y.g L5 2 800711 84 D F 15. 2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO-50-__ 259 /_80 54 Technical specification involved ns 2.1 Reported Under Technic.t! Specification as 5.6.3.b Date of Occurrence _ 7/6/80 TLne of Occurrence 1645

_ Unit 0

Identification and Description of' Occurrence:

Peak river. temperature of 96.7 degrees F.~7sas reached prior to the temperature de:line starting as a result of corrective action initiated based on river tempcrature predictions.

Conditions ' Prior to Occurrence:

Unit 1 @ 84.6% We Unit 2 @ 97.3% 1&e Unit 3 0 0% IEe e

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

4 P. educed waste heat S acharge to the reservoir.

A_pparent Cause of Occut rencie:

Computer predictions of river temperature was inaccurate due to solar heatir.;;.

s Analyr.is of Occurrence:

There w; s no damage to the plant equipment.

There was no activity released, no perronnel expo.aure or injury and no danger to the health or safety of the public.

Corrective Action

U-1 and 2 placed on cooling towers.

U-1 load reduced 125 MWe.

Failure Data:

i None

• R eten tion : G"criod - Lifetime; Responsibility - Administrative Supervisor 0 Revision:

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