ML20084K181
| ML20084K181 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 08/03/1974 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084K183 | List: |
| References | |
| 50-254-74-26, AO-50-254-74-26, NJK-74-200, NUDOCS 8305190198 | |
| Download: ML20084K181 (3) | |
Text
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([U 'E (() Quad-C4.. ;Gsnerating Station Pe ! Cif:':o Box 216
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NJK-74-200 August 3, 1974 Mr. John F. O ' Leary, Di rector Directorate of Licensing Regulation U. S. Atomi c Energy Commission Washington, D. C.
20545
Reference:
Quad-Citics fluclear Power Station Unit I Docket No. 50-254, DPR-29, Appendix A Sections 3.7.D.1, 3.7,0.2, and 3.7.D.3
Dear Mr. O ' Leary:
Enclosed please find Abnorr.al Occurrence P,cport No. 50-254/74-26 for Qaad-C i tics fluclear Powar. S tation. This was previcusly renorted to Region lit, Directorate of Reguletary Goerations by telephone on July 25, 1974, and to
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This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.I.a.
Very truly yours, A,' '-
$P'Q,QN,/ N COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION
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Enclosure:
A0-50 254/74-26 Report
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'f ~ REPORT. t4UhBER: A0 254/74-26
EPORT DATE: -August 3, 1974 R
OCCURRENCE DATE: July 25,1974 FACILITY: Quad-Cities Nuclear Power Station Cordova, Illinois 61242 IDENTIFICATION OF OCCURRENCE:
Unit One TIP machine number three ball valve would not close.
CONDITIONS PRIOR TO OCCURRENCE:
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Run mode with reactor power at 1334 HVt and a gross generator load.of 390 MWe, 4
DESCRIPTION OF OCCURRENCE:
On July 25, 1974, while obtaining a full core TIP set on Unit One for an LPRM calibration, it was noticed that the ball valve for TIP machine number three failed to close when the TIP was retracted out of the core. Operating the manual switch failed to close the valve. An instrument mechanic was immedi-ately dispatched-into the TIP room to attempt to free the vslve. He tapped on it and the valve cycled-closed.
un nam e um m. aponeyMT cAusE cr ccc'Ja,a,cncc; The TIP ball valves are arranged such that they are held in the closed position' by a spring and are opened by energizing a solenoid when the solenoid is de-energized, the spring returns the valve to the closed position. An accumulation of a dry lubricant, used in the TIP tubes, around the ball valve prevented the i
spring from performing its function. Thus, the accumulation of dry lubricant is designated as the'cause of this occurrence.
ANALYSIS OF OCCURRENCE:
Since the valve closed when tapped by the mechanic, the effects on the safe operation of the plant were minimal, if an isolation occurred while the valve would not operate, the shear valve could have been actuated to isolcte the line.
There were, thus, no effects on the health and safety of the public.
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~ CORRECTIVE ACTION:
I All the ball valves 'for Unit I had been previously cleaned as part of the cor-rective action from a similar occurrence on March 22, 1974 In view of this i
failure subsequent to that cleaning, a more thorough method for clecning was used on this occasion. The failed valve was disassembled, thoroughly cleaned,
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re-assembled, and re-installed. The valve operated satisfactorily after these r'epairs.
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l ~ A0-So-254/74-26 All TIP ball valves are scheduled to be inspected and cleaned on a yearly schedule.
It is felt that these The complete disassembly and cleaning method will, be used.
actions should prevent further failures of this type.
FAILURE DATA:
The TIP ball valves are supplied to the Station by the General Electric Company.
The GE part number is 112C2391 P 001.
Cumulative experience for these valves indicates that there have been severalin the in each case, the cause has been an accumulation of dry lubricant failures; The safety implications of_these failures are minimal since the
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alternative of actuating the shear valve is available in the event of an isolation.
The corrective actions to be taken as described above should minimize these failures in the future.
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