ML20085D399

Ro:On 721019,boric Acid Tank B & Boron Injection Tank Found Low in Boron Concentration.Caused by Improper Seating of Suction & Discharge Isolation Valves of Tank.Tank Recirculated W/Boric Acid Tank a

ML20085D399
Person / Time
Site:	Robinson
Issue date:	11/10/1972
From:	Utley E CAROLINA POWER & LIGHT CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085D381	List: ML20085D384 ML20085D396 ML20085D399 ML20085D407
References
NUDOCS 8307250330
Download: ML20085D399 (2)

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Carolina Power & Light Cuupany Q(' s

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~> t Mr. John F. O' Leary, Director Directorate of Reactor Licensing

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Washington, D. C. 20545 H. B. ROBINSON UNIT NO. 2 t LICENSE DPR-23 .

I DILUTION OF BORON INJECTION TANK _

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Dear Mr. O' Leary:

In accordance with paragraph 6.6.1.a, Technical Specifications 19, 1972, while operating at and Bases, it is reported that on October i boric acid tank and the boron injection tank were found

' 99.5% power, "B" The boric acid tank concentration was to be low in boron concentration.

19,683 ppm, and the boron injection tank was 19,726 ppm.

i The dilution occurred as a result of a test of the safety injection system on October 16, 1972. The safety injection pumps were lines.

operated to verify flow through all three cold leg safety injection h

Valve leakage This during this test permitted was due to the improper seating of suction a small quantity boron injection tank. Subsequent and disc _harge isolation valves of the boron injection tank. d "B" with the boron injection tank resultein both of thes recirculation of boric acid tank l

To correct the problem, the boron injection tank was recirculated hours, after which the boron injection tank with "A" boric acid tank for 1 i concentration was verified to be 20,152 ppm, which was within "A" boric acid tank, and specificat ons.

A batch of boric acid was preparedboric and added acid tankto were reprocesse d through tion.

two batches of solution from "B" the boric acid evaporator to return the tank to its proper concentra The Plant Nuclear Safety Committee has reviewed this evolution boron 7 gjd and recommended that an analysis of the boric acid tanks and the f J

injection tank be made immediately following any test involving the sa ety injection system which could cause dilution.

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November 10, 1972 ,

Mr. O' Leary Mr. Bill Sicdic of Region II, Division of Regulatory Operations, was notified by telephone, and Mr. John Davis of the same office was notified by telegraph on October 20, 1972.

Yours very truly,

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E. E. Uticy \]

Vice President Bulk Power Supply SB/NBB:za ec: Messrs. C. D. Barham N. B. Bessac B. J. Furr S. Grant 8

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