ML20084S695
| ML20084S695 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 05/15/1975 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20084S697 | List: |
| References | |
| AO-50-254-75-12, NUDOCS 8306170171 | |
| Download: ML20084S695 (3) | |
Text
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NJK-75-277 May 15, 1975 Director of Office of Nuclear Reactor Regulation U. 5. Nuclear Regulatory Commission Washington, D. C. 20555 Re fe rence: Quad-Ci ties Nuclear Power Station Docket No. 50-254, DPR 29
' Appendix A, Sections 3 5.E.1, 6.6.B.I.a Enclosed please find Abnormal Occurrence Report No. A0 50-254/75-12 for Quad-Ci ties Nuclear Power Station.
This occurrence was previously reported.
to Region lil, Directorate of Regulatory Operations by telephone on May 8, 1975 and to you and Region Ill, Directorate of Regulatory Operations by tel.ecopy on May 8, 1975 1
This report is submitted to you in o'ccordance with the requirements of Technical Specification 6.6.9.1.a.
Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION
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N. J. Ka1Ivianakis Station Superintendent NJK/LH/lk Region ill, Directorate of Regulatory Operations cc:
J. S. Abel 8306'170171 750515
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1 P.EPORT NUMBER: A0 50-254/75-12 REPORT DATE: May 15, 1975 OCCURRENCE DATE: May 5, 1975 FACI LITY :
Quad-Cities Nuclear Power Station Cordova, Illinois 61242 IDENTIFICATION OF OCCURRENCE:
Unit 1 RCIC system inoperable.
j CONDITIONS PRIOR TO OCCURRENCE :
Unit I was in the run rode at a core thermal power of 1291 MW and an elec-trical output of 393 MJ.
DESCRIPTION OF OCCURRENCE:
During the monthly surveillance. test of the RCIC system, on May 5,1975 at 5:37 p.m., the RCIC condensate pump was observed to have a high amp reading.
The pump was taken out of service to be inspected and repai red,
. thus rendering the RCIC system inoperable.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
Equipment Fai lure The ap' parent cause of this occurrence is designated as equipment failure.
The equipment failure was caused by defective motor windings that mal-functioned causing a high pump amp reading and in turn rendering the RCIC condensate pump motor inoperable.
ANALYSIS OF OCCURRENCE:
The RCIC system was inoperable whre the RCIC condensate pump motor failed.
During the period of the RCIC. system inoperability, the HPCI system was tested daily to insure its operability.
This testing insured the ability to safely shutdown and cooldown the reactor.
Thus the health and safety of the public were not Jeopardized by this occurrence.
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A0 50-254/75-12 May 15, 1975 CORRECTIVE ACTION:
The RCIC condensate pump motor was tagged out of service and a work request (1625-75) was initiated to inspect and repair the malfunctioning motor.
The motor was sent to the General Electric maintenance shop in Bettendorf, Iowa for repairs. There the motor windings were rewound. The rewinding included using a higher grade of insulated wire than that requi red to be in the motor.
The motor was re-installed and returned to service on May 8, 1975 at 7:00 p.m.
The RCic system was subsequently tested satisfactorily.
FAILURE DATA:
No similar occurrences have occurred in the past.
There are thus no safety implications based on cumulative experience related to this occurrence.
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