ML20084S301

Telecopy Ro:On 730103,standby Liquid Control Tank Placed on Air Sparge in Preparation for Boron Sample to Be Taken. Caused by Personnel Error.Operating Procedures Will Be Reviewed to Determine If Rev Necessary

ML20084S301
Person / Time
Site:	Dresden
Issue date:	01/04/1973
From:	Worden W COMMONWEALTH EDISON CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S296	List: ML20084S294 ML20084S301
References
NUDOCS 8306160475
Download: ML20084S301 (1)

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SUBJECT:

D.P.R.-25 DRESDEN NUCLEAR POWER STATION UNIT 3:

IHIS WILL CONFIRM A CONVERSATION WITH MR H. DANCE OF YOUR OFFICE e AT 1630 HOURS JANUARY 3 CONCERNING DILUTION OF BORON SOLUTION IN THE STAND BY LIQUID CONTROL TANK. ON JANUARY 3 AT 0631 HOURS THE e STAND BY--LIQUID CONTROL TANK WAS SUPPOSEDLY PLACED ON AIR SPARGE.

THIS WAS DONE IN PREPARATION FOR A BORON SAMPLE TO BE TAXEN LATER m,g DAY. BY 0810 HOURS IT WAS REPORTED THAT THE TANK WAS OVER FLOWING e

,m g VALUE CHECX ON THE SYSTEM DETERMINED THAT IN ADDITION TO THE AIR SP g ARGE VALVE, A WATER FILL VALVE WAh ALSO OPEN. THE WATER FILLED VALVE WAS g CLOSED AND A BORON SAMPLE WAS TAXEN TO DETERMINE THE BORON CONCENTRAT 10N. g AT THE SAME TIME, IN ANTICIPATION OF THE CONCENTRATION BEING 100 LOW AN ORDERLY SHUT DOWN WAS INITIATED. g A DISCUSSION WITH THE PEOPLE ON SHIFT REVEALED THAT THE OPERATOR ERRORED IN VVALVING IN THE TANK FOR AIR SPARGE. A REVIEW OF e OPERATING PROCEDURES WILL BE MADE TO DETERMINE IF A REVISION OR ADDITION CAN BE MADE TO ELIMINATE THE POSSIBILITY OF THIS SITUATION F e RON RE-

,,, gURING. AT THIS TIME LOAD IS BEING REDUCED AT THE RATE OF 8 M.W.E. e PER HOIR THIS 1.0AD DROP WIU. CONTINUE UNTIL EITHER THE UNIT TS SHUT DOWN OR THE BORON CONCENTRATION IS WITHIN LIMITS SHOWN IN FIGURE g 3.4 1 0F TECHNICAL SPECIFICATION W. P. WORDEN, SUPI. g

COMMONWEALTH EDISON DRESDEN NUCLEAR POWER STATION < fo'N [ g' l RT 1 , -

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