ML19345E184

LER 80-082/03L-0:on 801125,during Degraded Voltage Test, Breaker 24J1-2 Failed to Open Upon Receiving Undervoltage Test Signal & 2-RS-P-1B Was Inoperable for 3-h.Caused by Stuck Linkage Arm.Linkage Pivot Points Oiled

ML19345E184
Person / Time
Site:	North Anna
Issue date:	12/17/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345E183	List: ML19345E182 ML19345E184
References
LER-80-082-03L-01, LER-80-82-3L-1, NUDOCS 8012230416
Download: ML19345E184 (2)

Text

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/ /V/A/N/A/S/2/ (2) /0/0/-/0/0/0/0/0/-/0/0/ (3) /4/1/1/1/1 (4) / / / (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT UR E [L[ (6) /0/5/0/0/0/3/3/9/ (7) /1/1/2/5/8/0/ (8) [1/2/1/7/8/0/ (9)

DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/ / On November 25, 1980 while conducting a Degraded Voltage Test (2-PT-36.9.1), it/

/0/3/ / was discovered that the breaker 24J1-2 for the inside recirculation spray pump /

/0/4/ / failed to open upon receiving the undervoltage test signal, and consequently /

/0/5/ / 2-RS-P-1B was inoperable for three hours. Since the breaker was repaired /

/0/6/ / and tested satisfactorily and the pump was restored to an operable status with/

/0/7/ / in three hours the health and safety of the public were not affected. /

/0/8/ / /

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/ /S/B/ (11) /E/ (12) [B[ (13) /C/K/T/B/R/K/ (14) [A/ (15) [Z/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO. CODE TYPE NO.

(17) REPORT NUMBER /8/0/ /-/ /0/8/2/ /\/ /0/3/ /L/ /-/ [0/

ACTION FUTURE EFFECT SHUTDOWN ATTACIDfENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/B/ (18) [Z[ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) [Y/ (23) /N/ (24) /A/ (25) /I/2/0/2/(26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The failure of the breaker to open was due to a linkage arm that was stuck, /

/1/1/ / preventing . tripping latch to fall into place. The corrective action was to /

/1/2/ / oil the linkage pivot points so that the linkage arm could move freely.

/1/3/ / /

/1/4/ / /

FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

/1/5/ [G[ (28) /0/0/0/ (29) / NA / (30) /B/ (31) / Periodic Test /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36)

/1/6/ [ZL (33) [Z[ (34) / NA / / NA /

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) [Z[ (38) / -NA /

PERSONNEL INJURIES NUMBER DESCRIPTION (41)

/1/8/ /0/0/0/ (40) / NA /

LOSS OF OR TYPE DAMAGE TO FACILITY (43)

DESCRIPTION-

/1/9/ /Z/ (42) / NA /

PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY

/2/0/ /N/ (44) / NA /////////////

NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8012280 iib

Virginia Electric and Power Company North Anna Power Station, Unit 2

Attachment:

Page 1 of 1 Docker No. 50-339 Report No. LER 80-082/03L-0 Description of Event On November 25, 1980 while performing a Degraded Voltage Test, it was discovered that the breaker 24J1-2 for the inside recirculation spray pump failed to open upon receiving the undervoltage test signal, and consequently 2-RS-P-1B was inoperable until the breaker could be repaired. The applicable T. S. is 3.6.2.2, and the event is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence Since the breaker was repaired and the pump returned to an operable status in 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />, and Train A was operable, the health and safety of the public were not affected.

Cause of Event The failure of the breaker to open was due to a stuck linkage arm that prevented a tripping latch to fall into place.

Immediate Corrective Action The immediate corrective action was to declare 2-RS-P-1B inoperable, and issue a maintenance report to repair the breaker.

Scheduled Corrective Action i

There are no scheduled corrective actions.

Actions Taken to Prevent Reccurrence The corrective action was to clean and lubricate the trip linkage in the breaker and retest to verify the breaker performed satisfactorily.

Generic Implications There are no generic implications.

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