05000260/LER-1980-054-03, /03L-0:on 801004,refuel Interlocks Switch 2 Jammed in Overtravel Position,Rendering Switch Inoperable & Allowing Movement Toward Core in Startup Mode.Caused by Switch Operating Arm Rotating 180 Degrees

/03L-0:on 801004,refuel Interlocks Switch 2 Jammed in Overtravel Position,Rendering Switch Inoperable & Allowing Movement Toward Core in Startup Mode.Caused by Switch Operating Arm Rotating 180 Degrees

ML18025B266
Person / Time
Site:	Browns Ferry
Issue date:	12/22/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B265	List: 05000260/LER-1980-054, Forwards LER 80-054/03L-0 05000260/LER-1980-054-03, /03L-0:on 801004,refuel Interlocks Switch 2 Jammed in Overtravel Position,Rendering Switch Inoperable & Allowing Movement Toward Core in Startup Mode.Caused by Switch Operating Arm Rotating 180 Degrees
References
LER-80-054-03L-01, LER-80-54-3L-1, NUDOCS 8012300520
Download: ML18025B266 (4)

LER-1980-054, /03L-0:on 801004,refuel Interlocks Switch 2 Jammed in Overtravel Position,Rendering Switch Inoperable & Allowing Movement Toward Core in Startup Mode.Caused by Switch Operating Arm Rotating 180 Degrees

Event date:
Report date:
2601980054R03 - NRC Website

text

L(CENSEE EVENT REPORT CONTROL I3LOCK:

IPI.EASE PRINT OR TYPE ALLREQUIRED INFOR51ATION)

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0 09 GO 61 DOCK6T NUMBER EVENT DATE 74" 75 REPORT DATE 80 EVENT DESCRIPTION AND PRODAIILE CONSEQUENCES 010 During refueling operation while performing SI 4.10.A-1, refuel interlocks switch

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g ammed in over trave 1 position, rend ering switch inop drab 1e and

=a 1lowing movement toward core in start-up mode.

Reference T.S. 4.10.A-1.

No redundant systems.

6 There were no significant resu 1ting events.

There was no danger to hea 1th or.

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'afety of Public.

No Previous occurrences

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33 34 35 36 31 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o

Cause of event

was the switch operatin arm had rotated 180 de rees.

'The switch operating arm was placed in normal position and S.I. 4.10.A-l was corn leted.

Recurrence control is being evaluated.

METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q32

'BQ31 operator observed 45 46 I.OCATION OF RELEASE Qs NA 44 45 NRC USE ONI.Y LLLLLIJJLLLLi 68 '6!I 4

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DESCRIPTION

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'IO PUBLICITY ISSUED DESCRIPTIONQ

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10 NAME OF PREPARER solss0054o PHONE:

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Tennessee Valley Authority Bdowns Ferry Nuclear Plant Form BF-17 BF 15.P, 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 260 /

8054 Technical Specification Involved 4 ~ 10.A.1 Reported Under Technical Specification 6.7.2.b(4)

Date of Occurrence 10/4/80 Time of Occurrence 174 Unit

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l Identification and Descri tion of Occurrence:

While performing S.I. 4.10.A-1 refuel interlock switch 2 )ammed. in the overtravel

'osition rendering the switch inoperable and allowing movement toward core in startup mode.

, Conditions Prior to Occurrence:

Unit 1 9 20% steady state power Unit 2 8 0% refuel outage

.Unit 3 8 99% steady state power Action specified in the Technical Specification Surveillance Requirements met due to ino erable e ui ment.

Describe, NA A

arent Cause of Occurrence:

The switch operating arm had rotated 180 degrees.

Anal sis of Occurrence:

There was no damage to plant equipment.

There was no activity release, no

. personnel exposure or" in)ury and no danger to the health or safety of the public.

Corrective Action

'he switch operating arm was placed in normal position and S.I. 4.10.A-l was completed.

Failure Data:

'NA

• Retention:

• Revision:

eriod - Lifetime; Responsibility - Administrative Supervisor

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