05000281/LER-1980-038-03, /03L-0:on 801105,on-svc Boric Acid Storage Tank & Boron Injection Tank Concentration Found Less That 11.5%. Caused by Improper Valve Lineup.Boric Acid Concentration Increased

/03L-0:on 801105,on-svc Boric Acid Storage Tank & Boron Injection Tank Concentration Found Less That 11.5%. Caused by Improper Valve Lineup.Boric Acid Concentration Increased

ML18139A887
Person / Time
Site:	Surry
Issue date:	12/05/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A885	List: 05000281/LER-1980-037-03, /03L-0:on 801105,high Temp on Charge Pump a (2-CH-P-1A) Revealed Low Svc Water Flow.Low Discharge Pressure Alarm Failed to Annunciate.Caused by Clogged Pump Inlet Strainer & Clogged Pressure Switch Sensing Line 05000281/LER-1980-038-03, /03L-0:on 801105,on-svc Boric Acid Storage Tank & Boron Injection Tank Concentration Found Less That 11.5%. Caused by Improper Valve Lineup.Boric Acid Concentration Increased ML18139A884
References
LER-80-038-03L-03, LER-80-38-3L-3, NUDOCS 8012110398
Download: ML18139A887 (2)

LER-1980-038, /03L-0:on 801105,on-svc Boric Acid Storage Tank & Boron Injection Tank Concentration Found Less That 11.5%. Caused by Improper Valve Lineup.Boric Acid Concentration Increased

Event date:
Report date:
2811980038R03 - NRC Website

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TI] jWith the.Unit at 100% power, the on service BAST and BIT had a boric acid

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This is contrary to T.S.-3.3-.A.

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A plant shutdown and actions I :::m I to ~ncrease the boric acid concentration were initiated.

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0 ATmCHMENT 1, PAGE 1 OF 1 e SURRY PCWER STATION, UNIT 2 DOCKET NO:

50-281 REPORr NO:

80-038/03L-O EVENT DATE:

11-05-80 TITLE OF EVENT:

I.OW BORIC ACID *cON:ENrRATION

1.

EVENT DESCRIPTION

On November 5, 1980 with Unit 2 at 100% power, Primary Grade (PG) water was inadvertently added to the inservice Boric Acid Storage Tank, ("CII BAST) while clearing tags to return a component to service.

The inservice BAST was shifted to "B" BAST and subsequently sampled.

The sample revealed a low boric acid concentration of 11.2%

indicating that "B" BAST had unknowingly been diluted while perform-ing the above tagging report.

This event is contrary to Technical Specification 3.3.A.3 and is reportable per Technical Specification 6.6.2.b. (2).

2.

PROBABLE CONSEQUENCES:

The BAST provides a supply of boric acid to the charging system blender and the Boron Injection Tank.

A slightly lower concentra-tion of boric acid, 11.2% vice 11.5% would have been supplied to the reactor coolant system had the need arisen.

A plant shutdown and actions to increase the boric acid concentration were initiated immediately.

Therefore, the health and safety' of the public were not affected.

3.

CAUSE*:

An improper valve lineup as specified by the equipment tagging report caused the dilution of "B" & "C" BAST.

4.

IMMEDIATE CORRECTIVE ACTION

The immediate corrective action was to commence a ramp down of the unit, and. to initiate measures to increase the boric acid concentra-tion.

5.

SUBSEQUENT CORRECTIVE ACTION:

6.

Subsequent corrective action was to batch to the storage tanks to increase the boron concentration to within specifications.

ACTIONS TAKEN TO PREVENT RECURRENCE:

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7.

The importance of correct tagging reports was re-emphasized to the individuals involved.

To identify the type of fluid being controlled, valve mark numbers have been changed from a "CH" to a "PG designation-GENERIC IMPLICATIONS:

None.

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