ML20052G601
| ML20052G601 | |
| Person / Time | |
|---|---|
| Site: | Marble Hill |
| Issue date: | 05/07/1982 |
| From: | Shields S PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-82-620-000 10CFR-50.55E, PT21-82-620, PT21-82-620-000, S81-10, SVP-0003-82, SVP-3-82, NUDOCS 8205180498 | |
| Download: ML20052G601 (2) | |
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PUBLIC SERVICE INDIANA May 7, 1982 S81-10 S. W. Shields SVP-0003-82 Senior V<e President -
Nuchair Division Mr. James G. Keppler, Docket Nos.:
STN 50-546 Regional Administrator STN 50-547 U.S. Nuclear Regulatory Commission Construction Permit Nos.:
Region III CPPR - 170 799 Roosevelt Road CPPR - 171 Glen Ellyn, Illinois 60137 Marble Hill Nuclear Generating Station - Units 1 and 2
Dear Mr. Keppler:
On July 24, 1981, Mr. T. D. Geib of Public Service Company of Indiana, Inc.
(PSI) notified your office of a potentially reportable item as required by 10 CFR 50.55(e). An inspection of Limitorque valve motor operators re-vealed that an underrated terminal block had been installed in several of the operators. Further investigation determined that this terminal block, Marathon 300 series, had originally been rated for the specified service conditions of 600 volts and 30 amps, but had bcen subsequently derated to 300 volts and 30 amps.
Fucther investigation by PSI's architect-engineer, Sargent & Lundy, revealed that 480 volt motor leads in these motor operated valves were only temporarily terminated at terminal blocks. These leads are normally con-nected directly to field power cable when installed by the electrical contractor.
No corrective action is therefore required for the subject valve operators.
Sargent & Lundy has also surveyed Marble Hill project specifications that identify Marathon 300 series blocks for their possible use by other suppliers for applications greater than 300 volts and 30 amps. This survey determined that safety related equipment suppliers used these blocks for 120 volt control service, less than the revised lower rating, or did not use them at all. As a further precaution, equipment specifications are being revised to eliminate the use of the subject block for greater than 300 volt, 30 amp service conditions.
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, es P. O. Box 190, New Washington, Indiana 47162 812. 289.3000
a PUBUC SERVICE IFEMANA Mr. James G. Keppler May 7, 1982 Since the Marathon 300 series terminal block has not been used in any application more severe than its revised lower rating, it would not have affected adversely the safe operation of the plant.
This item is therefore not reportable under 10 CFR 50.55(e).
If you have any questions on this matter, please feel free to contact me.
Sincerely S. W. Shields SWS/TDG/kdh cc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 J. E. Konklin B. L. Doolittle J. J. Harrison i
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