ML20084S294

Ro:On 730103,standby Liquid Control Sys Tank Did Not Satisfy vol-concentration Requirements Established in Tech Specs. Caused by Personnel Error.Valve Checkoff Sheets Will Be Revised So Second Valve Must Be Open Before Water Is Added

ML20084S294
Person / Time
Site:	Dresden
Issue date:	01/09/1973
From:	Worden W COMMONWEALTH EDISON CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084S296	List: ML20084S294 ML20084S301
References
NUDOCS 8306160473
Download: ML20084S294 (2)

Text

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Commonwealth Edison Company 72 WEST ADAMS STREET

• CHICAGO. BLLINOle Addr.se A.pfp fes POST O F FIC E BOX 7 4 7

• C H I C A G O. ILLINOIS 606,o 50-249 Dresden Nuclear Power Station R. R. #1 Morris, Illinois 60450 g . , . .

January 9, 1973 _ . ,

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Mr. A. Giambusso 'M8$ f Daputy Director for Reactor Projects [*,ih -

Directorate of Licensing w5 gj' U. S. Atomic Energy Commission Washington, D. C. 20545 3'

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SUBJECT:

LICENSE DPR-25, DRESDEN NUCLEAR POb'ER STATION, UNIT #3, SECTION 6.6.B.3.

Dear Mr. Giambusso:

4 This is to report a condition relating to the operation of the unit in which, on January 3,1973, the Standby Liquid Control System tank did not satisfy the volume-concentration requirements established in Figure 3.4.1 of the Technical Specifications.

PROBLEM AND INVESTIGATION On January 3,1973, the Unit 3 equipment attendant valved the sparging air into the boron tank at 0631 hours0.0073 days <br />0.175 hours <br />0.00104 weeks <br />2.400955e-4 months <br />. This was in preparation for a routine monthly boron concentration analysis as required by the Technical Specifications.

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MS At 0810 hours0.00938 days <br />0.225 hours <br />0.00134 weeks <br />3.08205e-4 months <br />, the shift engineer received word that the boron

$$ tank was overflowing. During this time the unit was increasing load after the completion of routine surveillance tests. Upon notification of the

%o overflow condition, the load pickup was terminated at 746 FNe. Investiga- -

h tion showed that the sparging air was valved in as it shculd have been, y but the domineralized water was also valved in. Both valves, 3-1101-6 oA (cican domineralized water) and 3-1101-36 (sparging air), are normally l

[ locked closed. The equipment attendant mistakingly unlocked and opened (dab both valves, which he thought were in series in the air sparge line.

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As soon as the problem was reviewed, the Standby Liquid Control System was declared inoperable and the unit began an orderly shutdown.

! The shutdown was initiated at 0905 hours0.0105 days <br />0.251 hours <br />0.0015 weeks <br />3.443525e-4 months <br /> a 8 FGe/hD The unit was brought down at this rate because of the station 10MR n crim Operating Management Recommendations) which are normally used'during the weekend lo rops.

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COPY SENT REGION ,j aw V

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o Mr. A. Giambusso O January 9, 1973 During the orderly shutdown, a boron analysis was conducted to determine the concentration. It was 7.4% which is approximately one-half of the normal concentration. The tank level was consequently drained until 3700 gallons remained. Part of the boron solution which was removed from the tank was batch mixed with boron bearing chemicals and then returned to the tank to bring it back within concentration and volume limits. As required by 4.4.C.1 of the Technical Specification, a boron concentration analysis was conducted. The final tank volume was 3840 gallons at a sodium pentaborate concentration of 14.7% which is within the limits of Figure 3.4.1 of the Technical Specifications. At 1500 on January 4, the Standby Liquid Control System was declared operable and the orderly shutdown was terminated. The load was subsequently increased at 8 MWe/hr. to full power.

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, CORRECTIVE ACTION .

The valve checkoff sheets will be revised so that a second valve on the clean dcmineralized lire will have to be open before water can be added to.the boron tank. This should preclude the possibility of 4

this type of incident from reoccurring.

The individual that made this error was informed of his mistake and made aware of the consequences.

In anticipation of a Dresden license change to coincide with the Quad Cities licenses, an operating order has been issued which states that, until a Technical Specification revision is issued, an orderly shutdown shall be initiated and the reactor placed in cold shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> whenever the Units 2 or 3 Standby Liquid Control System becomes inoperable, a

Sincerely,

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W. P. Worden Superintendent WPW:do l

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