05000260/LER-1980-027-03, /03L-0:on 800712,while Performing SI 4.1.A.11 Reactor Protection Sys Scram,Channel B1 Relay Failed to de-energize.Caused by Inoperable Limit Switch on MSIV 1-38 Due to Corrosion.Limit Switches Replaced

/03L-0:on 800712,while Performing SI 4.1.A.11 Reactor Protection Sys Scram,Channel B1 Relay Failed to de-energize.Caused by Inoperable Limit Switch on MSIV 1-38 Due to Corrosion.Limit Switches Replaced

ML18025B024
Person / Time
Site:	Browns Ferry
Issue date:	08/08/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B023	List: 05000260/LER-1980-027, Forwards LER 80-027/03L-0 05000260/LER-1980-027-03, /03L-0:on 800712,while Performing SI 4.1.A.11 Reactor Protection Sys Scram,Channel B1 Relay Failed to de-energize.Caused by Inoperable Limit Switch on MSIV 1-38 Due to Corrosion.Limit Switches Replaced
References
LER-80-027-03L-02, LER-80-27-3L-2, NUDOCS 8008120485
Download: ML18025B024 (4)

LER-1980-027, /03L-0:on 800712,while Performing SI 4.1.A.11 Reactor Protection Sys Scram,Channel B1 Relay Failed to de-energize.Caused by Inoperable Limit Switch on MSIV 1-38 Due to Corrosion.Limit Switches Replaced

Event date:
Report date:
2601980027R03 - NRC Website

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Tennessee Valley Authc y

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Drowns Ferry Nuclear Plant Form BF-17 BF ]5.2 1/10/79 LER SUPPLEMENTAL INFORMATION AFRO Technical Specification Involved Table 3.1.A Reported Under 'I'echnical Specification 6.7.2.b (1)

Date of Occurt ence 7/12/80 Time of Occur rence 0120 Unit Identification and Descri tion 'of Occurrence:

)Rile performing SI 4.1.A.11 RPS scram channel Bl relay 5A-K3F failed to deenergize upon 10 percent closure of outboard MSIV 1-38.

Conditions Prior to Occurrence:

Unit, 1 8 84%

Unit 2 8 93%

Urrit 3 8 0 Action specified in,the Technical Spec'ification Surveillance Requirements met dua to i~no arable equi iaant.

Describe.

All other channels verified operable.

~A>~grant Cause of Occurrence:

Limit switch on MSIV 1-38 became inoperable due to corrosion from warm, moist air in steam tunnel.

l Analysis of Occurrence:

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 limit switch was replaced.

All inboard and outboard HSIV limit switches are being replaced.

Failure Data:

• Retention:

eriod - I.ifetime; Responsibility - Administrative Supervisor r

<iRevision:

A

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