05000338/LER-1980-075-03, /03L-0:on 800904,in Mode 1 at 100% Power,Sample Analysis of SI Accumulator 1B Revealed Excessive Boron Concentration.Caused by Stratification of Stagnant Solution in Accumulator.Concentration Diluted

/03L-0:on 800904,in Mode 1 at 100% Power,Sample Analysis of SI Accumulator 1B Revealed Excessive Boron Concentration.Caused by Stratification of Stagnant Solution in Accumulator.Concentration Diluted

ML19338D656
Person / Time
Site:	North Anna
Issue date:	09/18/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338D651	List: 05000338/LER-1980-075, Forwards LER 80-075/03L-0 05000338/LER-1980-075-03, /03L-0:on 800904,in Mode 1 at 100% Power,Sample Analysis of SI Accumulator 1B Revealed Excessive Boron Concentration.Caused by Stratification of Stagnant Solution in Accumulator.Concentration Diluted
References
LER-80-075-03L, LER-80-75-3L, NUDOCS 8009230615
Download: ML19338D656 (2)

LER-1980-075, /03L-0:on 800904,in Mode 1 at 100% Power,Sample Analysis of SI Accumulator 1B Revealed Excessive Boron Concentration.Caused by Stratification of Stagnant Solution in Accumulator.Concentration Diluted

Event date:
Report date:
3381980075R03 - NRC Website

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1 U.S. NUCLEAR REGULATORY COMMISSION' LICENSEE EVENT REPORT-4 -

' CONTROL' BLOCK / /-/ / /-/2/-(1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) f/0/1/

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/0/9/0/4/8/04 (8) / 7 7 Y Y 7 7 (9) o DOCEET NUMBER

- EVENT DATE REPORT DATE EVENT DESCRIPTION--AND PROBABLE CONSEQUENCES (10) p J/0/2/

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Oa September 4,1980, while operatina in Mode 1 at 100% power, sample analysis /

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of SI: accumulator 1B revealed the boron concentration to be 2109 ppa, exceeding / '

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T.S'. 3.5.1'which-stipulates that the concentration be maintained between 1900 /.

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~ and 2100 pga. -Since the boron concentration was brought back within the spec'/

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ification'in 2\\ hours, the health and safety of the public were not affected. /-

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SYSTEM

CAUSE

CAUSE

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VALVE CODE CODE SUBCODE' COMPONENT CODE SUBCODE SUBCODE

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SEQUENTIAL OCCURRENCE-REPORT REVISION i

LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

-(17) REPORT NUMBER

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS.(27) i

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The high sample concentration is believed to have been caused by stratifica-

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tion of the stagnant solution in the accumulator. Corrective action was

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to partially drain IB accumulator and replenish it from #1 RWST to achieve the /

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proper concentration.~

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FACILITY-METHOD OF

' DISCOVERY DESCRIPTION (32)

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STATUS'

% POWER OTHER STATUS

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LOCATION OF RELEASE (36)

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TYPE DESCRIPTION (39)

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PERSONNEL' INJURIES NUMBER DESCRIPTION-(41),

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LOSS OF OR DAMAGE TO FACILITY.(43)

TYPE DESCRIPTION ~

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PUBLICITY.

ISSUED <..~DESCRIPTIONL(45)

NRC USE ONLY

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.NAME-0F! PREPARER

W. R. CARTWRIGHT--

PHONE

'(703) 894-5151 J80092S M/S.

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Virginia Electric and Power Company

- North Anna Power Station, Unit 1 Attachment: Page 1 of 1

. Docker No. 50-338-Report No.'LER 80-075/03L-0 Description of F. vent On ' September 4,1980 while operating in Mode 1 at 100% power,

- sample analysis 'of SI accumulator IB revealed the boron concentration to be 2109.ppe, exceeding T.S. 3.5.1 which stipulates the concentration be maintained between 1900 and 2100 ppe.

Probable Consequences of Occurrence Since the boron concentration was brought back within specification in 2\\ hours, the health and safety of the public were act affected.

Cause of Event -

The high sample concentration is believed to have been caused by stratification of stagnant boric acid in the accumulator.

- Immediate Corrective Action Corrective action was to partially drain IB accumulator and replenish it from the RWST to achieve the proper boron concentration.

Scheduled-Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Reccurrence No action.is required.

- l

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

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