05000318/LER-1981-015-03, /03L-0:on 810319,results of Routine Sample of Boric Acid Storage Tank 21 Revealed Boric Acid Concentration Greater than Tech Spec Limit,Reducing Borated Warer Sources to One.Cause Undetermined

/03L-0:on 810319,results of Routine Sample of Boric Acid Storage Tank 21 Revealed Boric Acid Concentration Greater than Tech Spec Limit,Reducing Borated Warer Sources to One.Cause Undetermined

ML20027D157
Person / Time
Site:	Calvert Cliffs
Issue date:	04/17/1981
From:	BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027D155	List: 05000318/LER-1981-015, Forwards LER 81-015/03L-10 05000318/LER-1981-015-03, /03L-0:on 810319,results of Routine Sample of Boric Acid Storage Tank 21 Revealed Boric Acid Concentration Greater than Tech Spec Limit,Reducing Borated Warer Sources to One.Cause Undetermined
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8210280341
Download: ML20027D157 (2)

LER-1981-015, /03L-0:on 810319,results of Routine Sample of Boric Acid Storage Tank 21 Revealed Boric Acid Concentration Greater than Tech Spec Limit,Reducing Borated Warer Sources to One.Cause Undetermined

Event date:
Report date:
3181981015R03 - NRC Website

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At !!25 during post refueling ercalation to power testing, the control room operator received a routine sample result on 21 Boric Acid Storage Tank (B.A.S.T.) which revealed a boric acid concentration greater than allowed by the technical specifications at 8.1% Since the refueling water storage tank was isolated from the charging pumps in accordance with post startup test procedure PSTP-3, 22 B.A.S.T. was lef t as the only operable borated water source (T.S. 3.1.2.8). Five hundred gallons of demineralized water were added to 21 B.A.S.T. to adjust the boric acid concentration. Af ter the coatents were thoroughly mixed, the B.A.S.T. was sampled to confirm that the boric acid concentration had returned to within the technical specification limit. The adjusted boric acid concentration was 7.6% 21 B.A.S.T. was returned to service at 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />. The safety of the public was not affected by this event. This event is not a repetitive occurrence.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

All evaporator bottoms, prior to being recycled into the boric acid storage tanks, are sampled and analyzed by plant chemistry personnel. If the evaporator bottom concentration is determined to be above or below that permited in the boric acid storage tank, a calculation is performed to ensure that resultant B.A.S.T. concentration remains within specifications. Since no other source of concentrated boric acid was available to 21 B.A.S.T. during this period, it is believed that an evaporator l

bottom, analyzed to be 8.1% boric acid and allowed to be added to 21 B.A.S.T., may have been a poor sample and actually been of higher concentration. All chemistry technicians will be made aware of this event.

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