ML19345D132

LER 80-099/03L-0:on 801124,while Operating in Mode 1,at 83% Power,Sample Analysis of Safety Injection Accumulator 1C Revealed Boron Concentration in Excess of Tech Spec.Caused by Stagnant Solution Stratification in Accumulator

ML19345D132
Person / Time
Site:	North Anna
Issue date:	12/04/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D131	List: ML19345D130 ML19345D132
References
LER-80-099-03L, LER-80-99-3L, NUDOCS 8012090351
Download: ML19345D132 (2)

Text

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

/0/1/ /V/A/N/A/S/1/ (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/ RE

/L/ (6)

OU /0/5/0/0/0/3/3/8/ (7) /1/1/2/4/8/0/ (8) / V 7 9 9 9 9 (9)

DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10) 2

/0/2/ / On November 24, 1980, while operating in Mode 1, at 83% power, sample analysis /

, /0/3/ / of SI accumulator 1C revealed the boron concentration to be 2138 ppm, exceeding /

/0/4/ / T.S. 3.5.1 which stipulates that the concentration be maintained between 1900 /

/0/5/ / and 2100 ppm. Since the boron concentration was brought back within the spec- /

/0/6/ / ification in 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, the health and safety of the public were not affected. /

/0/7/ / The event is reportable pursuant to T.S. 6.9.1.9.b. /

/0/8/ / /

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

/0/9/ /S/F/ (11) /X/ (12) /Z/ (13) /A/C/C/U/M/U (14) [Z/ (15) [Z/ (16)

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

(17) REPORT NUMBER /8/0/ /-/ '/0/9/9/ /\/ /0/3/ /L/ /-/ [0/

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

[X[ (18) /Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) [Y/ (23) /N/-(24) /N/ (25) /D/1/0/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The high sample concentration is attributed to stratification of the stagnant /

/1/1/ / solution in the accumulator. Corrective action was to recirculate IC accumu- /

/1/2/ / lator with the Refueling Water Storage Tank until the proper concentration was /

/1/3/ / achieved. /

/1/4/ / /

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

/1/5/ [E[ (28) /0/8/3/ (29) / NA / (30) [B[ (31) / Routine Sample /

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

/1/6/ [Z[ (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 TYPE OF OR DAMAGE TO FACILITY ( 3)

DESCRIPTION c/1/9/ [Z[ (42) / NA /

PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY 4

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

NAME OF PREPARIR W. R. CARTWRT'iHT PHONE (703) 894-5151 8012090 3 51

d} .

Virginia Electric and Power Company North Anna Power Station, Unit 1

Attachment:

Page 1 of 1 Docker No. 50-338

+ Report No. LER 80-099/03L-0 Description of Event On November 24, 1980 while operating in Mode 1, at 83% power, sample analysis of SI accumulator IC revealed the boron concentration to be_2138 ppm, exceeding T.S. 3.5.1 which stipulates that the concentration be maintained between 1900'and 2100 ppm.

Probable Consequences of Occurrence Since the boron concentration was brought back within the specifica-tion in two hours, the health and safety of the public were not affected.

< Cause of Event.

The high sample concentration is attributed to stratification of

, the stagnant solution in the accumulator.

Immediate Corrective Action The immediate corrective action was to recirculate IC accumulator with the Refueling Water Storage Tank until the proper boron concentrat-ion was achieved.

Scheduled Corrective Action No further action is required.

Actions i.xen to Prevent Reccurrence Recirculation of the accumulator to be sampled with the RWST will mix the solution so *. hat a satisfactory sample can be obtained.

Generic Implications Stratification of boric acid in stagnant tanks is a generic problem.

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