ML20084J458

Ro:On 720812,during Verification of Mod 201-2-72,timer 2-1705-23 in Offgas Sys Discovered Inoperable.Caused by Loose Drive Gear for Timer Motor Armature.New Timer Installed

ML20084J458
Person / Time
Site:	Quad Cities
Issue date:	08/17/1972
From:	Palmer F COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084J462	List: ML20084J458 ML20084J467 ML20084J486
References
FAP-72-158, NUDOCS 8305120638
Download: ML20084J458 (2)

Text

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$ y Commonwealth Edison Company Q U A D.C I TI E S NUCLEAR POWER ST A TION

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Mr. J.F. O' Leary Director, Directorate of Licensing U.S. Atomic Energy Commission Washington, D. C. 20545

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Dear Mr. O' Leary:

Ref: Quad-Cities Nuclear Powei Station Unit 2 - DPR-30 Appendix A

• Sections 1.0.A.2, 3.2.D.1 and 6.6.A.3 The purpose of this letter is to inform you of the details regarding the failure of timer 2-1705-23 in the off-gas systen at Ouad-Cities Station Unit 2. This incident occurred on August 12, 1972.

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Descriotion of Incident The incident occurred during a Unit 2 outage with the reactor

, subcritical. While trying to verify modification #201-2-72 7 f3 -

it was discovered that timer 2-1705-23 in the off-gas system -

.i would not operate. The timer is designed to be energized on high off-gas radiation to automatically close off-gas isola-i tion valve AO-2-5406 and condensate isolation valve AO-2-5408 p after a fifteen minute _ time delay.

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'.J Mr . J . F . O ' Le ary August 17, 1972 3

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,. ; Investigation and Corrective Action Investigation indicated that one of the drive gears for

-l the motor armature of timer 2-1705-23 had come loose e causing the malfunction. A new timer was installed and functionally tested to operate properly. Timer 2-1705-23 was declared operable at 2 P.M. , August 12, 1972.

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

, f>W F.A. Palmer Superintendent

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