ML20084U200

AO 50-254/75-6:on 750318,transversing Incore Probe Machine 5 Ball Valve Failed in Open Position.Caused by Failure of Spring to Close Ball Valve Completely.Ball Valve Replaced

ML20084U200
Person / Time
Site:	Quad Cities
Issue date:	03/27/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J Office of Nuclear Reactor Regulation
Shared Package
ML20084U201	List: ML20084U200 ML20084U204
References
AO-50-254-75-6, NJK-75-157, NUDOCS 8306270470
Download: ML20084U200 (2)

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Quad C,mes Nuc' car Power Station L -E}, Post Gfice Box 216 l Cordova. Ilhno-s 61242 Telephone 309/654-2241 NJK-75-157 .

March 27, 1975 N,

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Mr. John F. O' Lea ry, Di rector y Q' pp Directorate of Licensing Regulation ' ,

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Washington, D. C. 20545 RE FE RENCE : Quad-Cities Nuclear Power Station

-Nk.  :}[Y' Docket No. 50-254, DPR-29 Appendix A, Sections 3 7.D.1, 6.6.B.I.a.

Dear Mr. O' Leary:

Enclosed please find Abnorrnal Occurrence Report No. 50-254/75-6 for Quad-Ci ties Nuclear Power Station. This occurrence was previously reported to Region lil, Directorate of Regulatory Operations by tele-phone on March 19, 1975 and to you and Region iIi, Directorate of Regulatory Operations by telecopy on March 20, 1975 This report is submitted to you in accordance with the requirements of Technicel Spec!fic::!cr. 6.6.3.1.s.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION

,$$ d,Y{Q' N. J. Kalivianakis Station Superintendent NJK:RAR/dkp cc: Region lil, Directorate of Regulatory Operations J. S. Abel Q 't h p

3533 8306270470 750327 PDRADOCK05000g S

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REPORT NUMBER: A0-50-254/75-6 REPORT DATE: March 27,1975 OCCURRENCE DATE: March 18,1975 FACI LITY: Quad-Cities Nuclear Power Station Cordova, IL 61242 IDENTI FICATION OF OCCURRENCE:

Unit one TIP machine #5 ball valve failed in the open position.

CONDITIONS PRIOR TO OCCURRENCE:

The unit was in the RUN mode at a steady state power level of 2480 MWt and 820 MWe.

DESCRIPTION OF OCCURRENCE:

On March 18, 1975, at 6:30.p.m., the unit one operator discovered that the ball valve for the #5 TIP machine showed an open Indication. The control key for the shear valve was given to the control room operator by the shif t engineer. An entry was made into the Unit one TIP cubicle and the ball valve was tapped. The indication immediately showed a closed condition.

nFC!nHoT!04 Or APPAP.ENT CAUSE OF OCCURRENCE:

Component Failure - The valve is solenoid operated to the open position and spring loaded to the closed position. The apparent cause of the occurrence was a failure of the spring to close the ball valve completely; thus, not picking up the limit switch.

ANALYSIS OF OCCURRENCE:

Prior to the March 18, 1975 occurrence, the most recent operation of TIP machine #5 w:s at 3:50 p.m. on March 17, 1975 Therefore, it is possible that the valve was open for 26 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br /> and 40 minutes. Under accident conditions with the drywell pres-surized to 62 psig,if the TlP tube became severed, the flow through the open pene-tration would have been 72.1 SCFM. This leakage is only a fraction of the capacity of the Standby Gas Treatment System and would have been easily processed by it.

There would have been no significant amounts of radioactive materials released, nsr would the public health and safety have been endangered.

CORRECTIVE ACTION: .

On March 22, 1975 the old ball valve was replaced with a new one. The new valve was cycled to verify its operability.

FAILURE DATA: *' ~

Equipment identification - The TIP ball valve is a solenoid operated ball valve s'imi-Isr to that shown on General Electric Company drawing Il2C2391P001.

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In view of the number of failures that have occurred with these valves, several new ones are on order of a newer type design. These new valves will be installed when they are received to compare their performance to the original type valves.

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