05000296/LER-1980-009-03, /03L-0:on 800404,during Normal Operation,Relay 16A-K63B Overheated & Failed,Blowing Fuse Causing Containment Isolation Sys Group 6 Valves to Fail Closed. Caused by Natural Aging of Relay.Relay & Fuse Replaced

/03L-0:on 800404,during Normal Operation,Relay 16A-K63B Overheated & Failed,Blowing Fuse Causing Containment Isolation Sys Group 6 Valves to Fail Closed. Caused by Natural Aging of Relay.Relay & Fuse Replaced

ML18025A835
Person / Time
Site:	Browns Ferry
Issue date:	05/02/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A834	List: 05000296/LER-1980-009, Forwards LER 80-009/03L-0 05000296/LER-1980-009-03, /03L-0:on 800404,during Normal Operation,Relay 16A-K63B Overheated & Failed,Blowing Fuse Causing Containment Isolation Sys Group 6 Valves to Fail Closed. Caused by Natural Aging of Relay.Relay & Fuse Replaced
References
LER-80-009-03L-03, LER-80-9-3L-3, NUDOCS 8005070514
Download: ML18025A835 (3)

LER-1980-009, /03L-0:on 800404,during Normal Operation,Relay 16A-K63B Overheated & Failed,Blowing Fuse Causing Containment Isolation Sys Group 6 Valves to Fail Closed. Caused by Natural Aging of Relay.Relay & Fuse Replaced

Event date:
Report date:
2961980009R03 - NRC Website

text

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CONTROL BLOCK:

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LICENSEE CODE 14 15 ENSEE EVENT REPORT OI (PL 6

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1 1 ps~ps 25 26 LICENSE TYPE 30 57 CAT 58 LICENSE NUhIBER U. S. NUCLEAR REGULATORY COMMISSION 0 BOOGOTOSIq EASE PRINT OR TYPE ALLREQUIRED INFOAMATIONI 5o U4 c E ~L0 0 5

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES OIO During normal operation a relay overheated and failed blowin fuse causin

~03 primary containment iso 1ation system group 6 valves to fail closed, resu 1ting in control room isolation division I & II; containment atmospheri c monitoring division I & II; and refuel floor vent monitor 3-90-140A failing in alarm condition.

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3 ~ 2.A, 3 ~ 6 ~ C ~ 2 and 3 ~ 7 ~ 6.b.

Previous occurrence BFRO-50-260/79018.

There are no redundant systems.

There was no hazard to the public health or safety.

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CAUSE

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VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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CODE TYPE No.

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28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN Q

ATTACHMENT NPRD.4 PRlh'IE COMP.

COMPOENENT TAKEN ACTION ON PLANT hIETHOD HOURS Q SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER

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Cause of event

was relay 1 6A-K63B fai 1ing causing fuse 1 1 MIC-5A to blow.. Genera 1 Electric, coil size 55-1GZ, model CR12DA04002AA.

The relay and fuse were replaced.

No recurrence control required, failure was within the expected life of the relay.

3 4

7 8

9 FACILITY STATUS

% POWER OTHER STATUS E

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10 12 13 44 ACTIVITY CONTENT RELEASEO OF RELEASE AhIOUNTOF ACTIVITY 4

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10 44 PERSONNEL EXPOSURES 7

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11 12 13 PERSONNEL INJURIES hIETHOD OF DISCOVERY DISCOVERY DESCRIPTION

~AO3I Operator observed 45 46 LOCATION OF RELEASE NA 45 80 80 80 80 7

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'l2 LOSS OF OA DAMAGE TO FACILITY 43 TYPE

DESCRIPTION

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68 69 NRC USE ONI.Y 80 80

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LER SUPPLEMENTAL INFORMATION BFRO-BO-296 / 6M9 Techniral Specification Involved 3.2A, 3.6.C.2 6 3.7.6.6 Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 4/4/80 Time of Occurrence 1034 Unit

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Identification and 13c~scri tion'of Occurrence:

Relay 16A-K633 overheated and failed blowing fuse 11 MIC-5A.

This caused primary containment isolation system group 6 valves, drywell compressor valves and drywell leak detection valves to fail closed.

Also caused control room isolation division I & II; containment atmospheric monitoring division I & II and refuel floor vent monitor 3-90-140A to fail in alarm condition.

Co>>ditions Prior to Occurrence:

Unit 1 8 32%

Unit 2 8 97%

Unit 3 8 98%

Action specified

!n the Technical Specificat on Surveillance Requirements m;:

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. e Grab samples were made of drywell atmosphere.

A ar ent Cause of Occurrence:

Relay 16A-K63B failed due to natural aging causing fuse ll MIC-5A to blow.

Analysis of Occur rence:

There was no damage to plant equipment.

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

Failures were in the conservative direction.

Corrective Action

The relay and fuse were replaced.

Failure D;!ta:

BFRO-50-260/79018

• Retention:

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- Adntinistrativc Supervis~'.i

• Revision:

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