ML20084K615
| ML20084K615 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 06/21/1974 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084K617 | List: |
| References | |
| AO-50-254-74-19, NJK-74-126, NUDOCS 8305190496 | |
| Download: ML20084K615 (3) | |
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C::mm, calth Edisin 7C4 bm I Quad-Cit;es Generating statron Post Office Box 216 7 "-.. -
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WLd.1 June 21, 1974 Mr. John F. O' Leary, Director Directorate of Licensir.g Regulation U. S. Atomic Energy Cornission Washington, D. C.
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REFERENCE:
Quad-Cities Nuclear Power Station Docket No. 50-254, DPR-29, Docket No. 50-265, DPR-30, Ap;nndix A, Sections 3.5.H.2 and 4.5.H.1.d
Dear Mr. O' Leary:
t Enclosed, please find Abnormal Occurrence Reports A.O. 50-254/
74-19 and A.,0. 5r 0.'5/71 11. Thesn ne e rence:.= r: pr crivsiv rerxw;.M we;;ien III, Directviale of Regulatory Uperations by telephone and ra telegram, and to you by telegram on June 13, 1974.
These reports are submitted to you in accordance with the re-quirements of Technical Specification Section 6.6.B.1.a.
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Very truly yours, I
I COMMONWEALT9 EDISCN CCMPANY l
QUAD-CITIES NUCLEAR PCT:.R STATION t
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REPORT NUMBER: A0-50-254/74-19 REPORT DATE: June 21, 1974 OCCURRENCE DATE: June 13, 1974 FACILITY: Quad-Cities Nuclear Power Station Cordova, Illinois 61242-IDENTIFICATION OF GCCURRENCE:
Condenser Pit five-foot level switch failed to actuate Control Room Annunciator during monthly testing.
CONDITIONS PRIOR TO OCCURRENCE:
1.
Unit I Reactor in cold shutdown.
2 All three Unit I Circulating Water Pumps out of service.
DESCRIPTION OF OCCURRENCE:
Level Switch IS-1-44L1-251 did not act::r.ta the Centrol Enr.;.. ?.nnune.D.tnr hou uwuuily ourveillance of U2e cornienser pii, five-foot level svir,cnes was performed in accordance with Technical Specification 4.5.H.1.d.
Out--
of-service cards were placed on the three Circulating Water Pumps to pre-clude operation until the apparent malfunction was corrected. A work request was imediately initiated to investigate and repair the apparent malfunctioning trip and alarm circuitry.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
The apparent cause of the failure of the surveillance test of LS-1-4441-25A to actuate the Control Room Annunciator is that the Level Switch Float l
Plunger was not fully lifted vertically during testing, thus not clo::ing l
the switch contacts.
ANALYSIS OF OCCURRENCE:
Investigation inilcates that no switch failure and thus no occurrence actually occurred.. Therefore, this incident has no safety implications.
CORRECTIVE ACTION:
Purther testing and investigation shewed the icyc1 cvitch trip and alam I
circuitry to be fully operable. The out-of-service cards on the Circulating l
Water Pumps because of this occurrence were removed. Operators vill be in-structed in the proper mothod of actuating these level switches for future testing.
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FAILURE DATA:
The five-foot Condenser Pit Level Switches have performed satisfactorily in previous tests. A similar incident also occurred on June 13, 1974 in testing Unit 2 five-foot Condenser Pit Level Switches (Reference A.O.-
50-265/74-11).
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