ML20083D234
| ML20083D234 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 09/19/1991 |
| From: | Blosser J UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 91-03, 91-3, ULNRC-2489, NUDOCS 9109300097 | |
| Download: ML20083D234 (3) | |
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scriac ni G Cataway Aa7f Sept embe r 19, 1991 U. S. Nuclear Kegulatory Conaission Document Control Desk k'ashington, DC 20555 Ull;RC-24 89 Gentlemen:
DOCKET NUMBER 50-463 CALLAVAY PLANT UNIT 1 FACILITY OPERATING *..ICENSE NPF-30 SFECIAL RFPORT 91-03 LOOSE-FART DETECTION SYSTEM CHANNEL INOPERAPLE FOR GREATER THAN 30 DAYS This Special Repcrt is being submitted pursuant. to T(chnien1 Spe 'fication 3.3.3.8 Action (n) concerning ths inoperability of w channel of the Loose-Part Detection Syrtem.
J D. blosse:
Manager, Callaway Plant J DB/TPS /"Jdl/1 rj cc:
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Bert Davis Mr. M. David Lyach (2 copies)
Regional Administrator U.S. Nuclear Regulatory Commicsion U.S. Nuclear Regulatory Con.nission OWFN - Mail Stop 13E21 Region 111 Was5ington, D.C.
20$$5 799 Roosevelt Road Glen Ellyn, IL 60137 Manager, Electric Departn:ent Mr. liarold K. Chernoff Missouri Public Service Co nission Supervisor Licensing P.O. Box 360 Wolf Creek Nuclear Operating Corp.
Jefferson City MO 65102 P.
O, p>ox 411 burlin. con, ransas 66839 Records Center Mr R L. Itague Institute af Nuclear Power Operations Chief Proj ec t Section 3C Suite 150 U.S. Nuclear P.egulatory Commission 1100 Circ'e 75 Paruway Region 111 Atlanta, t \\ 30339 799 Roosevelt Rond Clen Ellyn, IL 6013' NRC Senior esident Inspector
d-I SPECIAL REPORT 91-03 LOOSE-PART DETECTION SYSTEM CHANNEL l@PJRABLE FOR CR'MTER THAN 30 DAYS This report is submitted in accorr'ance with Technical Specification 3.3.3.8 Action (a) - Sich states. "k'ith one or more Loose Part Detection System channel (s) inoperable for more than 30 days, prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel (s) to OPERABLE status" At 0900 CDT on 8/20/91. following receipt of a Main Control Board Loose Part Detection System annunciator and performance of an intervice inspection by Instrument and Controls technicians and licensed operators, Channel 1 of the Loose Part Detection System was determined to be inoperabic. The plant was in Mode 1 at 100% power.
The Channel 1 accelerometer is located in the containment mounted on the lower part of the r ector vessel near the incore instrunentation. Initial troubleshooting of Chaoel I has determined that the problem lies with the sensor mounting or assoct ted sensor cabling. Since the instrument. sensor is connected to the reactot vessel head (thus inaccessib!c during power operations), further troubles ;oting vill not be performed until the next outage of sufficient duration. This is the second channel that has become inoperable; Channel 3 became inoperable on 6/20/91 (reference Special Report 91-02). The remaining ten channels in this system remain operable.
L'ntil furtne r t roubleshooting has bec n completed, actions to be taken to prevent recurrence cannot be determined M
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