05000296/LER-1980-022-03, /03L-0:on 800616,while Performing SI 4.1.A-14, Turbine first-stage Pressure Permissive & Pressure Switches PS-1-91 a & B Exceeded Limits.Caused by Setpoint Drift. Switches Recalibr

/03L-0:on 800616,while Performing SI 4.1.A-14, Turbine first-stage Pressure Permissive & Pressure Switches PS-1-91 a & B Exceeded Limits.Caused by Setpoint Drift. Switches Recalibr

ML18025A966
Person / Time
Site:	Browns Ferry
Issue date:	07/14/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A965	List: 05000296/LER-1980-022, Forwards LER 80-022/03L-0 05000296/LER-1980-022-03, /03L-0:on 800616,while Performing SI 4.1.A-14, Turbine first-stage Pressure Permissive & Pressure Switches PS-1-91 a & B Exceeded Limits.Caused by Setpoint Drift. Switches Recalibr
References
LER-80-022-03L-03, LER-80-22-3L-3, NUDOCS 8007180314
Download: ML18025A966 (4)

LER-1980-022, /03L-0:on 800616,while Performing SI 4.1.A-14, Turbine first-stage Pressure Permissive & Pressure Switches PS-1-91 a & B Exceeded Limits.Caused by Setpoint Drift. Switches Recalibr

Event date:
Report date:
2961980022R03 - NRC Website

text

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permissive and pressure switches PS-1-81 A and B and PS-1-91 A and B setpoints exceeded i~03

~T.S. Table 3.1.A limits.

This would inhibit a reactor scram on turbine tri until J

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approximately 32 percent power.

There were no redundant channels.

There was no danger to health or safety of public.

Previous occurrence BFRO-50-260/80022.

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296 8022 Technical Specification Involi'ed Table 3.1.A ltcportod Undor Tcchnical Sf>ccification 6.7.2,b(l)

Date of Occurrence 6/16/80 Time of i7ccu> rance Opec Unit.

Identification and Description 'of 'Occurrence:

Turbine first-stage pressure permissive ance pressure.switches pS-1-81

/> and 8 and PS 91 A 6 B setpoints exceeded T.S. limit of equal to or less than. 154 PSIG.

This would inhibit a reactor scram on turbine trip, until approximately 32 percent power (approximately 175 PSIG).

Conditions Prior to Occurrence:

Unit 1 8 98%

Unit 2 8 96%

Unit 3 8 100%

Acti=>> specified in the Tech>>ic,.l Specific. ation Surveillance Requirements m.

due to inoperable eflux!ipment.

Describe.

Apparent Cause of Occurrence Cause of occurrence was setpoint'drift.

Analysis of Occurred!ce:

There was no damage 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

The switches were inspected, recklibrated, and functionally tested for repeatability.

Failure Data:

BFRO-50-260/80022

+Retention:

~Revision:

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