05000260/LER-1981-014-03, /03L-0:on 810313,mode a of Reactor Water Level Instrumentation Indicated Full Upscale Resulting in Turbine Trip.Caused by Loss of Ref Leg to 2-LITS-3-203A & B & 2-LIS-3-184 Due to Partially Open Equalizing Valve

/03L-0:on 810313,mode a of Reactor Water Level Instrumentation Indicated Full Upscale Resulting in Turbine Trip.Caused by Loss of Ref Leg to 2-LITS-3-203A & B & 2-LIS-3-184 Due to Partially Open Equalizing Valve

ML20003F202
Person / Time
Site:	Browns Ferry
Issue date:	04/07/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003F200	List: 05000260/LER-1981-014, Forwards LER 81-014/03L-0 05000260/LER-1981-014-03, /03L-0:on 810313,mode a of Reactor Water Level Instrumentation Indicated Full Upscale Resulting in Turbine Trip.Caused by Loss of Ref Leg to 2-LITS-3-203A & B & 2-LIS-3-184 Due to Partially Open Equalizing Valve
References
LER-81-014-03L-01, LER-81-14-3L-1, NUDOCS 8104200387
Download: ML20003F202 (2)

LER-1981-014, /03L-0:on 810313,mode a of Reactor Water Level Instrumentation Indicated Full Upscale Resulting in Turbine Trip.Caused by Loss of Ref Leg to 2-LITS-3-203A & B & 2-LIS-3-184 Due to Partially Open Equalizing Valve

Event date:
Report date:
2601981014R03 - NRC Website

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8 84NENT OESCRIPTION AND PRCSABLE CONSEQUENCES h f7TT1 g During normal operation while decreasing load for M/c set maintenance, mode A of l

- l the Reactor Water Level Instrumentation indicated full upscale resulting in a l

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(TS 3.1.A and 3.2.B)

There was no hazard to the health or safety l

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40 41 42 43 44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS 27 Equalizing valve on 2-LITS-3-52 was partially open. Closed equalizing valve, l

,,,,, j i verified reactor water instruments operable.

.A design change request has been l

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8114 Technical Specification Involved 3.1.A.and 3.2.B 6.7.2.b(2)

Reported Under Technical Specification Date of Occurrence 3/13/81 Time of Occurrence 2259 Unit 2

Identification and Description of Occurrence:

While reducing power for MG set maintenance, equalizing valve on.2-LITS 3-52 was partially open resulting in full upscale reading of reactor water level instrumentation causing a scram. ~ Instruments affected: 2-LITS-3-52; 2-LIS-3-203A, B,'and LI_S-3-184.

Conditions' Prior to Occurrence:

Unit 1 @ 97%

Unit 2 @ 50 Unit 3 @ 98%

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

In 'accordance with Tech. Spec. Table 3.2. A, began cooldown, to go to cold shutdown.

Apparent Cause of Occurrence:

Equalizing valve on 2-LITS-3-52 was partially open resulting in loss of reference leg to 2-LITS-3-203A and B and 2-LIS-3-184.

Analysis of Occurrence:

_There was no danger to the health or safety of the public, no release of activity, no damage to plant or equipment and no resulting significant chain of events.

Corrective Action

Closed the equalizing valve and initiated a design change request to install a locking device on the valve to p.revent recurrence.

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Failure Data:

eriod - Lifetime; Responsibility - Administrative Supervisor None

• Retention:

• Revision:

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