05000259/LER-1980-073, Updated LER 80-073/01T-1:on 800928,river Water Temp Rise Peaked Above Tech Spec Level.Caused by Incorrect Computer Temp Rise Predictions.River Flow Increased

Updated LER 80-073/01T-1:on 800928,river Water Temp Rise Peaked Above Tech Spec Level.Caused by Incorrect Computer Temp Rise Predictions.River Flow Increased

ML19340E316
Person / Time
Site:	Browns Ferry
Issue date:	01/09/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19340E315	List: 05000259/LER-1980-073, Updated LER 80-073/01T-1:on 800928,river Water Temp Rise Peaked Above Tech Spec Level.Caused by Incorrect Computer Temp Rise Predictions.River Flow Increased
References
LER-80-073-01T, LER-80-73-1T, NUDOCS 8101130412
Download: ML19340E316 (2)

LER-1980-073, Updated LER 80-073/01T-1:on 800928,river Water Temp Rise Peaked Above Tech Spec Level.Caused by Incorrect Computer Temp Rise Predictions.River Flow Increased

Event date:
Report date:
2591980073R00 - NRC Website

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UPDATE REPORT - PREVIOUS REPORT DATED 10/1f 80*"""''* *"* '"~"~ '

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60 61 DOCEET NUwSER 68 69 EVENT DATE 79 REPORTCATE 8'c EVENT DESCalPTION AND PROsABLE CONSEQUENCES h t o 12 l I During ste Ay state operation, the river water temperature rise peaked at 5.1 F d/t.

l 5TF1 l This was a 0.17 d/t violation of technical specification E.T.S.2.1.

The next day,

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l it was noted that river temperature was rapidly increasing. Unit 3 was placed on j

o 4 l o i s t l cooling tower mode: however, d/t again went 0.1 F over limit. Previous occurrences: _

g l BFR0 259/78011, 78012 and 80054. There was no hazard to the public. This report ITTTl I is applicable to units 2 and 3 also.

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CAUSE CESCRIPT*0N AND CORRECTIVE ACTIONS h l i l o l l Computer temperature rise predictions were incorrect. On first occurrence, the m Iriver flow was increased. Upon second occurrence, unit 3 was placed on cooling i1 i7i l tower cooling. Occurrences appear to be at random requiring no further corrective j

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% POWER oTHER STATUS sc Hy DISCovtRY DESCRIPTION NA l

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A VITY CO TENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Ii l o I W @D OF RELEASEW@l NA l

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DESCRIPTION

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Tennessee Valley Authority Fona BF 17 Browns Ferry Nuclear Plant BF 15.2 1/10/79 1

LER SUPPLEMENTAL INFORMATION BFRO 259 / 8073 Technical Specification Involved 2.1 (Appe'ndix B)

Reported Under Technical Specification 5.6.3.b (Appendix B) i 9/28/80 zuuu Date of Occurrence & 9/29/80 Time of Occurrence & 0615 Unit. 1&3 4

Identification and Description of Occurrence:

River water temperature rise peaked at 5.1 F d/t. Computer. river temperature predictions gave no indication that the 5.0 F d/t limit would be violated.

This report is applicable to units 2 and 3 also.

Conditions'P *sr to Occurrence:

I Unit 1 @ 97% prior to the 9/28/80 occurrence; 82% during 9/29/80 occurrence.

Unit 2 @ refuel outage

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Unit 3 @ 99% prior to the 9/28/80, occurrence; 100% during the 9/29/80 occurrence.

Action specified in the Technical Specification Surveillance Requirements met i

due to inoperable equipment. Describe.

Reduced was,te heat discharged to the reservoir.

Apparent Cause of Occurrence:

Computer river temperature Pv. dictions were incorrect. A contributing fattor may be the extensive rainfall and the lower than normal ambient tssperatures experienced throughout the valley for the past 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

l Analysis of Occurrence:

j No damage to any plant equipment. No activity was released. No personnel

. exposure or injury and no danger the public health and safety.

I

Corrective Action

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- Increased river flow requested and unit 3 was placed on cooling tohers.

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Failure Data:

None

• Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor l

• Revision:

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