ML20084U848

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AO 50-254/75-2:on 750106,RCIC Valve 1301-17 Failed to Fully Close.Caused by Brush Rigging Not Making Proper Contact W/ Armature.Brush Tension Increased
ML20084U848
Person / Time
Site: Quad Cities Constellation icon.png
Issue date: 01/15/1975
From: Kalivianakis N
COMMONWEALTH EDISON CO.
To: Oleary J
Office of Nuclear Reactor Regulation
Shared Package
ML20084U851 List:
References
AO-50-254-75-2, NJK-75-31, NUDOCS 8306290321
Download: ML20084U848 (2)


Text

Com writh Edison Ou" s G:nsrating Station s C ' Post O Box 216

. Cordova, Illinois 61242 -s Telephone 309/654 2241 -

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January 15, 1975 .

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4 Mr. John F. O' Leary, Director Directorate of Licensing Regulation U.S. ATOMIC ENERGY COMMISSION Washington, D. C. 20545

REFERENCE:

Quad-Cities Nuclear Power Station, Unit One Docket No. 50-254, DPR-29 Appendix A, Sections 1.0.A.2, 3.5.E.1, 6.6.B.I.a

Dear Mr. O' Leary:

Enclosed please find Abnormal Occurrence Report No. 50-254/75-2 for Quad-Cities Nuclear Power Station. This occurrence was previously reported to Region ill, Directorate of Regulatory Operations by telephone on January 6,1975 and to you and Region Ill, Directorate of Regulatory Operations by telecopy on January 6, 1975 This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.I.a.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CIT ES NUCLEAR POWER STATION g uWf .

NV J. Kalivianak s Station Superintendent NJK:SH/dkp cc: Region 111, Directorate of Regulatory Operations J. S. Abel PDR ADDCK PDR S

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l REPORT NUMBER: A0-50-254/75-2 REPORT DATE: January 13, 1975 i OCCURRENCE DATE: January 6, 1975 f FACILITY: Quad-Cities Nuclear Power Station Cordova, IL 61242 i

IDENTIFICATION OF OCCURRENCE:

i .

Unit i Reactor Core Isolation Cooling Valve 1301-17 failed to fully close.

! CONDITIONS PRIOR TO OCCURRENCE:

Unit 1 Operating steady state at 822 MWe.

S Unit 2 in refueling outage.

3 i DESCRIPTION OF OCCURRENCE:

l i At 1:20 a.m. on January 6, 1975, during the RCIC monthly valve operability test, dual Indication would not clear on outboard steam isolation valve 1301-17, in-dicating the valve had not fully closed. Upon investigation by electrical main-

, tenance, i t was found that the armature of the valve motor operator was opea 4 circuited, thus prev ating valve movement. Technical Specification 3.5.E.1 was ,

i violated as a result of this occurrence. l

! OE310 NATION OF AFFARENT CAUSE OF OCCURRENCE:

n

! Equipment Failure - Investigation of the motor by electrical maintenance revealed i- that the brush rigging was not making proper contact with the armature. .This

} caused the open circuit Indication.

h j ANALYSIS OF OCCURRENCE:

The safety implications of this occurrence are minimized because all of the other emergency core cooling systems were completely operable at the time of the oc-currence and HPCI operability was immediately verified.

! CORRECTIVE ACTION:

! The immediate corrective action in response to.this occurrence was to close the f Inboard.RCIC isolation valve 1301-16 and verify HPCI operability per Techn.ical j- Specification 3 5.E.2. Brush tension was increased and the motor operator func--

. tioned properly. The valve was returned to service at 2:20 p.m. and RCIC was proven operable at 4:30 p.m. on January 6, 1975 Further examination of the motor operator is being conducted during the current e i Unit 1 outage to verify proper brush alignment and motor operability (W.R.75-206).

, ., FAILURE DATA:

l' There have been no similar occurrences in the past and it is felt that the cor-rective actions taken should preclude any similar failures in the future.

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