ML19347D418

LER 81-023/03L-0:on 810220,during Surveillance Test Review, Data from Two Previous Tests on Diesel 2J Batteries Was Found Not Usable.Caused by Failure to Verify That Initial Conditions Were Consistent W/Previous Tests

ML19347D418
Person / Time
Site:	North Anna
Issue date:	03/11/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347D413	List: ML19347D412 ML19347D418
References
LER-81-023-03L, LER-81-23-3L, NUDOCS 8103170574
Download: ML19347D418 (2)

Text

.- CLEAR 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

/0/1/

E LL/ (6) /0/5/0/0/0/3/3/9/ (7) /0/2/2/0/8/1/ (8) /o/3/1/1/8/1/ (9)

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

/0/2/_ / On February 20, 1981, while operating at 100% power, it was discovered during /

/0/3/ / the review of the D.C. Distribution Systems surveillance test that data from /

/0/4/ / two previous performances of the test for the 2J Diesel batteries was not /

/0/5/ / usable for comparison on a cell voltage basis due to improper test conditions. /

/0/6/ / Since the previous test with reliable data (performed on 5/26/80) compared /

/0/7/ / favorably with the data from the test performed on 2/18/81, the public health /

/0/8/ / and safety were not affected. /

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

/0/9/ /E/E/ (11) LD/ (12) LZ/ (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 /8/1/ /-/ /0/2/3/ O/ ,

/0/3/ g/ /-/ [0/

ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER g/ (18) LG/ (19) $/ (20) g / (21) /0/0/0/0/ (22) g/ (23) g/ (24) LA/ (25) /E/3/5/5/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The data collected from the two previous periodic tests completed on 2J Diesel /

/1/1/ / batteries was not usable for comparison because each test was performed without/

/1/2/ / verifying that the initial test conditions were consistant with those utilized /

/1/3/ / on previous tests. The data from the present test was compared with data from /

i

/1/4/ / the last reliable test to verify tech. spec. compliance. /

FACILITY METHOD OF i STATUS  % POWER OTHER STATUS DISCOVERY DESCRIPTION (32) l L1/5/ g/ (28) /1/0/0/ (29) / NA / ( 0) DISCOVERY B/ (31) / Engineer review of test /

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

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

PERSONNEL EXPOSLTES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) LZ[ (38) / NA /

PERSONNEL INJURIES l 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 l ISSUED DESCRIPTION (45) NRC USE ONLY l /2/0/ /N/ (44) /. NA /////////////

( .

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

m 8103170SF/l j >

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

Attachment:

Page 1 of 1 Docket No. 50-339 Report No. LER 80-023/03L-0 Description of Event On February 20, 1981, with Unit II at 100% power, it was discovered during the review of the D.C. Distribution Systems surveillance test that data of two previous performances of this test was not usable (2J Diesel only) for comparison on a cell voltage basis. This event is contrary to T.S. 3.8.1.1 and reportable pursuant to T.S. 6.9.1.9.c.

Probable Consequences of Occurrence Since the last test with reliable data (performed on 5/26/80) compared favorably with data from the test performed on 2/18/81, the public health and safety were not affected.

Cause of Event This event occurred as the result of not having the 2J Diesel battery bank in the same condition as utilized on tests performed prior to 9/4/80.

For the surveillance test performed on 12/1/80, the individual cell voltages exhibited a wide divergence from the average voltage which would indicate inadequate equalization. For the test performed on 9/4/80, it is believed that the batteries had just been equalized and the individual cell voltages were read without waiting for the batteries to stabilize.

Either of these case: would render comparisons on a cell voltage basis unreliable.

Immediate Corrective Action The immediate corrective action was to compare the data obtained in the 2/18/81 D.C. Distribution Systems test to the last reliable set of data from the 5/26/80 surveillance test. This data was used to comply with technical specifications.

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

Actions Taken to Prevent Recurrence Test methodology will be reviewed and the appropriate procedures will be revised as necessary and '.n accordance with manufacture r's recommendations.

Generic Implications There are no generic implications to this event.

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