05000259/LER-1980-058-03, /03L-0:on 800728,during Normal Operation While Performing SI 4.1.A-14,pressure Switches PS-1-81A & B, Turbine First Stage Pressure Permissive,Setpoints Found Set Above Tech Spec Limit.Caused by Instrument Drift

/03L-0:on 800728,during Normal Operation While Performing SI 4.1.A-14,pressure Switches PS-1-81A & B, Turbine First Stage Pressure Permissive,Setpoints Found Set Above Tech Spec Limit.Caused by Instrument Drift

ML19331D724
Person / Time
Site:	Browns Ferry
Issue date:	08/28/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19331D716	List: 05000259/LER-1980-058, Forwards LER 80-058/03L-0 05000259/LER-1980-058-03, /03L-0:on 800728,during Normal Operation While Performing SI 4.1.A-14,pressure Switches PS-1-81A & B, Turbine First Stage Pressure Permissive,Setpoints Found Set Above Tech Spec Limit.Caused by Instrument Drift
References
LER-80-058-03L-01, LER-80-58-3L-1, NUDOCS 8009030496
Download: ML19331D724 (2)

LER-1980-058, /03L-0:on 800728,during Normal Operation While Performing SI 4.1.A-14,pressure Switches PS-1-81A & B, Turbine First Stage Pressure Permissive,Setpoints Found Set Above Tech Spec Limit.Caused by Instrument Drift

Event date:
Report date:
2591980058R03 - NRC Website

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s RE*0AT C A E EvF r.T DESCRIPTION AND PROB A9t E CC%ECUENCES O'o j o ;-] l During normal operation while performing SI 4.1. A-14, pressure switches PS-1-81A

,n4 q ; and 3, Turbine First Stage Pressure Permissive, setpoints were found set above the Technical Specification limit of 154 psig (T.S. Table 3.1.A).

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and operable. There was no effect on the public health or safety. Previouse[ents:

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.,i g L y the normal S.I. schedule. These switches vill be replaced by an analog systen.

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Browns Ferry Nuclear Plant BF 15. 2 1/10'T9 LER SUPPLEMENTAL INFORMATION B F RO 259 f 8058 Technical Specification Involved Table 3.1.A Reported Under Technical Specification 6.7.2,b(2)

Date of Occurrence 7/28/80 Tune of Occurrence 0830 Unit 1

Identification and Description'of' Occurrence:

PS-1-81 A and B, Turbine Firat Staze Pressure Per:21ssive, setpoints had drif ted above T.S limits. 5etpoints were fourd to Se 171 and 172 psig respectively during S.I. Testings Conditions ' Prior to Occurrence:

Unit 1 at 1068.We Unit 2 at 2 85.We Unit 3 at 1045 We Action specified in the Technical Specificatica Survetll.nce Requirements me.

due to inoperable equipment.

Describe.

N/A Acparent Cause of Occurrence:

Instrument drift.

<[nalysis of Oct urrence:

There was no damage to the plant equipment, There was no activity releare, no personnel exposure or injury and no danger to the health or safety of tne publi.:.

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C ;rrective Action:

Inspected, recalibrated and functionally tested for repeatability. These switches will be replaced by an analog systen.

Failure Data:

259/7916, 259/799, 260/7916, 260/8022, 296 /797, 296/7912 and 296 /3022.

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