05000260/LER-1980-028-03, /03L-0:on 800715,core Spray Discharge Pressure Switch 2-PS-75-35 Did Not Operate within Tech Spec Limit. Caused by Instrument Drift.Switch Was Inspected,Calibr & Functionally Tested for Repeatability

/03L-0:on 800715,core Spray Discharge Pressure Switch 2-PS-75-35 Did Not Operate within Tech Spec Limit. Caused by Instrument Drift.Switch Was Inspected,Calibr & Functionally Tested for Repeatability

ML18025B039
Person / Time
Site:	Browns Ferry
Issue date:	08/13/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B038	List: 05000260/LER-1980-028, Forwards LER 80-028/03L-0 05000260/LER-1980-028-03, /03L-0:on 800715,core Spray Discharge Pressure Switch 2-PS-75-35 Did Not Operate within Tech Spec Limit. Caused by Instrument Drift.Switch Was Inspected,Calibr & Functionally Tested for Repeatability
References
LER-80-028-03L-01, LER-80-28-3L-1, NUDOCS 8008190449
Download: ML18025B039 (3)

LER-1980-028, /03L-0:on 800715,core Spray Discharge Pressure Switch 2-PS-75-35 Did Not Operate within Tech Spec Limit. Caused by Instrument Drift.Switch Was Inspected,Calibr & Functionally Tested for Repeatability

Event date:
Report date:
2601980028R03 - NRC Website

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There was no hazard to the public 1 health or safety.

Previous occurrences 259/7337 and 259/783.

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'CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 iJ LThe instrument had drifted.

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There has been only'three instances of D.S J3 Linstrument drift on this type switch in 7 years.

The problem is considered random and no further action is planned.

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80 2 Technical Specification Involved Reported Under Technical Specification

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Date of Occurrence 7/18/8 Time of Occurrence Unit Identification and D~escri tion'of Occurrence:

While 'performing SI 4.2.B-21, core spray discharge pressure switch, PS-75-35, did not operate within T.S. limits of 185 + 10 PSIG.

Conditions Prior to Occurrence:

U-1 8 81%

MWe U-2 8 76%

MWe U-3"8 57,%

MWe Action specified in the Technical Specification Surveillance'equirements met

= None

~Aparent Cause of Occurrence:

Instrument Drift.

Analysis of Ocrurronce:

There was no damge to plant equipment.

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

Corrective Action

Inspected, calibrated and functionally tested the..switch for repeatability.

t Failure Data:

259/7337 and 259/783

• Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor Revision:

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