05000260/LER-1979-022-03, /03L-0:on 791001,rod Block Monitor (RBM) a Nonfunctional Due to Shortened Lamp Base.Rbm B Damaged Was in Repairing of RBM A.Caused by Short Circuit When RBM a Was Changed.Power Supplies in Both Channels Repaired

/03L-0:on 791001,rod Block Monitor (RBM) a Nonfunctional Due to Shortened Lamp Base.Rbm B Damaged Was in Repairing of RBM A.Caused by Short Circuit When RBM a Was Changed.Power Supplies in Both Channels Repaired

ML18024B074
Person / Time
Site:	Browns Ferry
Issue date:	10/29/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B073	List: 05000260/LER-1979-022, Forwards LER 79-022/03L-0 05000260/LER-1979-022-03, /03L-0:on 791001,rod Block Monitor (RBM) a Nonfunctional Due to Shortened Lamp Base.Rbm B Damaged Was in Repairing of RBM A.Caused by Short Circuit When RBM a Was Changed.Power Supplies in Both Channels Repaired
References
LER-79-022-03L-01, LER-79-22-3L-1, NUDOCS 7911010391
Download: ML18024B074 (4)

LER-1979-022, /03L-0:on 791001,rod Block Monitor (RBM) a Nonfunctional Due to Shortened Lamp Base.Rbm B Damaged Was in Repairing of RBM A.Caused by Short Circuit When RBM a Was Changed.Power Supplies in Both Channels Repaired

Event date:
Report date:
2601979022R03 - NRC Website

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7922 Technical Specification Involved Table 3.2.C.7.d Reported Under Technical Specification

6. 7. 2. b (2)

Date cf Occurrence l ~

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Time of Occ:urrence 0 30 Unt Identification and Desc~ri t.ion of Occurrence:

Rod Block Monitor (RBM) "A" malfunctioned due to shorting a lamp bulb during changeout.

RBM "B" was damaged in the process of repairing RBM "A."

Both channels were out of service approximately six hours.

Conditions Prior to Occurrence:

Unit 1 8 approximately 802 HWe.

Unit 2 8 approximately 1095 MHe.

Unit 3 in refueling outage.

Action specified in the Technical Specification Surveillance Requirements met

~'P The action specified in note 7(d) of Table 3.2.c. in the technical specification was initiated immediately.

parent Cause of Occurrence:

=Human error.

~Anal ale of Occurrence:

'one Cor r ective Action:

The assemblies damaged were repaired, functionally tested, and returned to service.

Employees were cautioned to exercise more care during operation and maintenance activities.

Failure Data:

None

~Retention:

+Revision:

eriod - Lifetime; Responsibility - Administrative Supervisor