ML20084K511
| ML20084K511 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/05/1974 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084K513 | List: |
| References | |
| AO-50-265-74-15, NJK-74-140, NUDOCS 8305190453 | |
| Download: ML20084K511 (3) | |
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Quad Cities Generating Station L
Post Office Box 216 Cordova. Illinois 61242 Telephone 309/654-2241 gg i
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7, July 5, 1974 v
%,. s OJ 6 e' Mr. John F. O' Leary, Director
/ 'u@\\ s Directorate of Licensing Regulation U.S. Atomic Energy Commission Washington, D.C.
20545
Reference:
Quad Cities Nuclear Power Station, Unit 2 Docket No. 50-265 DPR-30 Appendix A, Sections 1.0.A.4, 4.4.A.2, 6.6.B.l.1.
Dear Mr. O' Leary:
Enclosed please find Abnormal Occurence Report No. A.O. 50-265/
74-15 for Quad Cities Nuclear Power Station.
This was previously reported to Region III, Directorate of Regulatory Operations by tn3cphnr.c on June 25. 197.* and to you and Region III Directow t.:.
of negulatory operations by telegram on oune 26, 1974.
This report is submitted to you in accordance with the requirements of Technical Specifications 6.6.B.l.a.
Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION
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Region III, Directorate of Regulatory Operations l
J.S. Abel
Enclosure:
Abnormal Occurence Report No. A.O. 50-265/74-15 t
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REPORT NUMBER:
A.O. 50-265/74-15 f
REPORT DATE:
July 5, 1974
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OCCURENCE DATE:
June 25, 1974
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n-FACILITY:
Quad-Cities Nuclear Power Station
.Cordova, Illinois 61242
.f IDENTIFICATION OF OCCURENCE:
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Unit 2 Standby Liquid Control System "A" relief valve setpoint drift.
' CONDITIONS PRIOR TO OCCURENCE:
Unit 2 reactor critical at 530 MWE with normal water level and temperature.
DESCRIPTION OF OCCURENCE:
While performing relief valve setpoint tests for unit 2 standby liquid control system, at 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br /> on June 25, 1974, the "A" relief valve was found to lift at 1520 psig, which exceeds the Technical Specification 4.4.A.Z. limit of 1400( p 4 1490 psig7 The standby liquid control system pressure gage was re-calibrated at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> and the A relief valve was reset to lift at 1460 psig.
Tac D relief valve was chac' rad and roundite relicyc at 1400 psig.
At 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on June 26, 1974, the A relief valve was reset to lift at 1440 psig and D was set to lift at 1430 psig to allow for setpoint drift.
1 DESIGNATION OF APPARENT CAUSE OF OCCURENCE:
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r This Abnormal Occurence is attributed to setpoint drift of the "A" relief valve.
., a ANALYSIS OF OCCURENCE:
The impact of the 1520 psig relief valve setpoint drift is minimal on the operation of standby liquid control system.
The increase
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in SDLC relief valve set point was in a safe direction, allowins? '/
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for continued pumping sodium pentaborate solution into the reactor' in the event that the standby liquid control system would have been required.
CORRECTIVE ACTION:
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- 1 Action Item Record No. 4-74-57 was issued on June 13, 1974, to investigate the cause of standby liquid control relief valve setpoint drift and determine _ corrective action.
This investigation
'is presently in progress by Quad Cities Station and the Crosby Valve and Gage Company.
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'AILURE DATA:
Standby ligdid control relief valve setpoints hhhe been found to be out of specification limits twice before at Quad Cities Station.
In June of 1973', unit 1 reliefs were found to be set low.
During refueling outage tasts in May of 1974, unit 1 relief valves were found to relieve "higlier than specification limits.
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