ML19262C571
| ML19262C571 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 02/07/1980 |
| From: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | |
| References | |
| NUDOCS 8002140530 | |
| Download: ML19262C571 (3) | |
Text
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a south CAROLINA ELECTRIC a GAS COMPANY PO$ f OPPIC E 804 794 CotuMciA, south CAROLINA 29218 M. C. JOH NSON
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February 7, 1980 United States Nuclear Regulatory Commission ATTN:
hk. James P. O'Reilly Director Region II 101 Marietta Street, NW Atlanta, Georgia 30303
Subject:
V. C. Summer Nuclear Station Unit #1 Reportable Item in Accordance with 10CFR50.55(e)
Gentlemen:
The purpose of this letter is to provide a written report of a potentially reportable item relative to 480 volt motor terminations. The item was previously reported to Region II I & E Inspector Mr. Ray Hardwick during his inspection at the Construction Site on January 8, 1980.
Nature of Condition Eight 480 volt motors were found to have incorrect terminations with respect to construction guidelines that stipulate taping require-ments that incorporate materials and techniques environmentally qualified by SCEEC's cable vendor.
In particular, three fan motors that were being reterminated to correct a Nonconformance in insulating tape (Site NCN #770E) were found to contain incorrect friction tape as revealed by color; and were suspected of having outer wraps of Scotch
- 33 tape in lieu of the required Scotch #88 tape.
The incorrect insulating tape condition was previously reported to the NRC in our letter of September 27, 1979. Also, five valve operator motors that were being reterminated to..orrect a nonreportable broken lead problem (Site NCN #863) were found to have one of the three conductors wrapped with Scotch #33 tape only.
The eight motors in question were reported on Site NCN #884E to document the new concerns relative to incorrect terminations.
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Mr. James P. O'Reilly Page 2 February 7, 1980 Cause Investigations into the cause of incorrect motor terminations revealed that Construction QC documentation existed to attest to the acceptability of terminations prior to turn over of equipment to Operations. Also, Operations documentation reveals that when termina-tions are made by Electrical Maintenance personnel, only approved materials were used.
In some cases no evidence exists to show a motor was worked on after turn over.
It is concluded that the specific cause of the incorrect terminations is indeterminable. SCE&G believes that Craft and/or Start-up people have, for unknown reasons, re-terminated motors outside QA program controls and inspection functions that exist in either Construction or Operations.
Safety Implications SCE&G Engineering has determined that this item has the potential to have affected adversely the safety of operations of the plant had it remained uncorrected; provided problems exist with the terminations on the redundant equipment motors for the eight known to be incorrect, and provided it is assumed that the ungenlified materials being used in some of the terminations would have failed.
Actions to Correct Conditions NCN #884E has been dispositioned to have all safety related 480 volt terminations redone using proper materials as stipulated in the construction guidelines. The disposition also requested that during the rework, any existing terminations being removed that were recognized as deficient be reported to SCE&G Engineering for assessment of extent and affect on redundancy. At the date of this letter, SCESG is in the process of preparing to reterminate.
Corrective Action to Prevent Recurrence Emphasis has been provided in writing to Construction and Operations management personnel, by SCE&G Engineering, of the importance of following vendor qualified methods of terminating, as well as, having terminations made within the QA program with required inspections and documentation.
These management personnel have been requested to instruct their personnel to insure they are aware of the rules and procedures under which ina-tions are to be made.
e Mr. James P. O'Reilly Page 3 February 7, 1980 SCE&G believes the actions outlined above will adequately resolve the various problems with 480 volt safety related terminations. Since all the necessary corrective actions are within the QA program and are in the precess' of being implemented, we consider this a final report on this subject. All actions taken.regarding this item will be available at the construction site for NRC review. Should further information be required, please let us know.
Very truly yours, f-ffdfg DRM/MCJ/jls cc:
C. J. Fritz G. C. Meetze M ice of Director Inspection & Enforcement Washington, D. C.
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