05000339/LER-1981-020-03, /03L-0:on 810218,emergency Diesel Generators 2H & 2J Were Declared Inoperable.Caused by Batteries Failing Surveillance Test.Cells Replaced

/03L-0:on 810218,emergency Diesel Generators 2H & 2J Were Declared Inoperable.Caused by Batteries Failing Surveillance Test.Cells Replaced

ML19343C883
Person / Time
Site:	North Anna
Issue date:	03/18/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19343C879	List: 05000339/LER-1981-020, Forwards LER 81-020/03L-0 05000339/LER-1981-020-03, /03L-0:on 810218,emergency Diesel Generators 2H & 2J Were Declared Inoperable.Caused by Batteries Failing Surveillance Test.Cells Replaced
References
LER-81-020-03L-01, LER-81-20-3L-1, NUDOCS 8103250489
Download: ML19343C883 (3)

LER-1981-020, /03L-0:on 810218,emergency Diesel Generators 2H & 2J Were Declared Inoperable.Caused by Batteries Failing Surveillance Test.Cells Replaced

Event date:
Report date:
3391981020R03 - NRC Website

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O 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

/L/ (6)

/0/5/0/0/0/3/3/9/ (7)

/0/2/1/8/8/1/ (8) /0/3/1/8/8/1/ (9)

DOCKET hD1BER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/

/ On February 18, 1981, while operating in Mode I at 100% power, the 2H and 2J

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/ Emergency Diesel Generators were declared inoperable as a result of their

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/ batteries failing a periodic surveillance test (2-PT-86-D.C. Distribution

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/ Systems). Since both offsite sources were verified operable within one hour and /

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/ 2H diesel was restored to operability within two hours, the public health and

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/ safety were not affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/

/E/E/ (11) [E/,(12) [A[ (13) /B/A/T/T/R/Y/ (14) LZ/ (15)

LZ/ (16)

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

CODE TYPE NO.

(17) REPORT NUMBER

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/L/

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

/A/ (18) [H[ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) [][/ (23) /N/ (24) /A/ (25) /E/3/5/5/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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/ This event occurred as a result of both sets of emergency diesel generators

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/ failing their respective surveillance test.

Two cells were replaced one each on /

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/ 2H and 2J batterv sets. After replacement, a post maintenance checkout verified /

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/ batteries were within specifications.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY' DISCOVERY DESCRIPTION (32)

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[E[ (28)

/1/0/0/ (29) /

NA

/ (30) [B[ (31) / Operator Observation

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ACTIVITY CONTENT RELEASED OF RELEASE, AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

/1/6/

[ZL (33)

[Z[ (34) /

NA

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NA

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PERSONNEL EXPOSURES SU!BER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z/ (38) /

NA

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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

NA

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LOSS OF OR DAMAGE TO FACILITY (43)

TYPE

DESCRIPTION

/1/9/

LZ[ (42) /

• iA

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PUBLICITY ISSUED

' DESCRIPTION (45)

NRC USE ONLY

/2/0/, LN[ (44) /

NA

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

8108250 M

Virginia Electric and Power Company North Anna Power Station, Unit 2 Attachment: Page 1 of 2 Docket No. 50-339 Report No. LER 81-020/03L-0

Description of Event

On February 18, 1981, while operating in Mode I at 100% power, the 2H and 2J Emergency Diesel Generator batteries failed their respective 92 day periodic surveillance test.

In addition, a subsequent deviation occurred when a cell in 2J battery bank was not recorded as being out of specification on specific gravity when submitting the initial deviation report. This event is contrary to T.S. 3.8.1.1 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence Even though several cell specific gravities were slightly out of specification, it is believed that the batteries were fully capable of performing their function. Both offsite electrical circuits were verified operable within one. hour and 2H diesel was restored to an operable status within two hours (as per Technical Specifications). Therefore, the public health and safety were not affected.

Cause of Event

The cause of this event was low specific gravities in one cell in 2H battery bank, and in two cells of two separate batte

'n 2J battery bank.

Immediate Corrective Action

Both diesels were declared inoperable and both offsite sources were verified operable within one hour. Subsequent to.that action, 2H Diesel was tagged out and one battery (3 cells on each battery) was replaced to correct for the low specific gravity recorded on the one cell for 2H battery bank. The diesel was tested, declared operable and returned to service within two hours of the event.

The 2J Diesel was then tagged out and one battery (with one cell reading low on specific gravity) was replaced, tested and found satisfactory.

In order to correct for the low specific gravity reading not j

initially reported on one cell in 2J Diesel battery bank, the 2J Diesel battery bank was placed on an equalize charge for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and af ter being allowed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to. stabilize was verified within the required limits.

Scheduled Corrective Action There is no further action scheduled at this time.

Actions Taken to Prevent Recurrence The manufacturer has been contacted for assistance in reviewing procedures presently being utilized for care and operation of the batteries.

Any further action (ie. procedure changes, equipment modifications, etc) will depend upon the outcome of this review.

O

Attachment:

Page 2 of 2 Generic Implications From reviewing previous test data it is apparent that utilizing previous test data to evaluate present test data is not satisfactory with the present means used in maintaining the batteries. A manufacture's review of the procedures now used for maintaining and testing the batteries will be utilized to correct any deficiencies in maintaining station batteries.

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