ML20084B104

Ro:On 720702,RCIC Motor Operated Valve MO-1-1301-49 Failed to Open When Given Signal from Control Room.Cause Under Investigation.Torque Switch Setting Changed to Prevent Recurrence

ML20084B104
Person / Time
Site:	Quad Cities
Issue date:	07/10/1972
From:	Palmer F COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084B107	List: ML20084B104 ML20084B151
References
FAP-72-132, NUDOCS 8304060122
Download: ML20084B104 (2)

Text

r 309.!54 2241 :

l

' \J. . ......~'.

I.

.s Commonsvealth Edison Company--

~Q U A D.C li 4 E 5 NUCLEAR POWE R ST A TIO N - --

Address Reply to:

POST OFFICE BOX 216

• CORDOYA, ILLINOl5 61242 FAP-72-132 .

July 10, 1972

,.%ti*f n .

1

%( :yQ \

Mr. J . F . O ' Le ary , Dire ct or _

l'. .j d '.2,* ) g Director of Licensing . G . W mf U. S. Atomic Energy Commission i.

W UM g/ ,P/

Washington D. C. 20545 k'S / .e .

Dear Mr. O' Leary:

0 Ref: Quad-Cities Nuclear Power Station Unit 1 DPR 29 - Appendix A - Section 1.A.4, Section 6.6. A.3, and Section 6.6.B.3 The purpose of this letter is to inform you of the details regarding the failure of RCIC motor operated valve MO-1-1301-49 to open when given a signal from the control room. This incident occurred at Quad-Cities Unit 1 on July 2,1972 at 7:15 a.m.

Descrintion of Failure The loss of auxiliary power test on Unit 1 was conducted at 7: 06 a.m. on July 2, 1972. At 7: 15 a.m. that same .

day, the Reactor Core Isolation Cooling System was being manually lined up to demonstrate pump injection into the reactor vessel. The final injection valve failed to open at that time. At the time of the failure, the reactor was shut down with all rods inserted following the test trip and scram. Reactor pressure was approxi-mately 1000 psig.

Additional Information On the day of the failure, prior to the loss of power test, the monthly operability test of the injection valve was performed and proved the valve to be operable.

Later that same day , af ter the failure, the valve was manually opened and the system injection into the vessel t was successfully demonstrated. .

0304060122 720710 [D y;%-25 [

ogg ry gDRADOCK05000 Y

-COPY SENT REGION =

L a

- ~ ,

);

=: - - 0-- . O-. -

. - Mr. J . F . O ' Le ary July 10, 1972 Repairs

, The torque switch' settings for the motor operator of this valve were changed as an action to prevent a future reoccurrence of this incident. The settings for this motor had been previously changed to over-come faulty operation. Increasing the torque switch -

settings should allow the motor to develop more power to open or close the valve. Following the torque swit ch adj us tments , the valve was demonstrated to function properly.

Continuing Investigation This occurrence is part of a continuing problem with the performance of motor operated valves. Investigations into the cause of the problems is continuing.

As additional information regarding this problem becomes available, we will inform you on a timely basis.

Very truly yours, COMMONWEALTH EDISON COMPANY Quad-Cities Nuclear Power Station

$ s. r F. A. Palmer Station Superintendent FAP/zm t

e EMS