ML19341A192
| ML19341A192 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 01/09/1981 |
| From: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, AECM-81-27, NUDOCS 8101220341 | |
| Download: ML19341A192 (2) | |
Text
.
- r MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 1840. J AC K S O N, MIS SIS SIP PI 3 9 2 0 5 j
J^jyMgJgf January 9, 1981 Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.
Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director
Dear Mr. O'Reilly:
SUBJECT:
Grand Gulf Nuclear Statien Units 1 and 2 Docket Nod. 50-416/417 File 0260/15525/15526 PRD-80/70, Status Report No. 1, Flexible Conduit Grounding AECM-81/27 On December 10, 1980 Mississippi Power & Light Company noti-fied Mr. P. K. VanDoorn of your office of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construc-tion site. The deficiency concerns the potential loss of solid metallic grounding of the flexible conduit used by our NSSS Supplier in the Power Generation Control Complex (PGCC) equipment.
Our progress in the investigation into the extent and scope of the deficiency is provided in the attached status report.
We expect to submit a determination of reportability and final report on this deficiency by March 19, 1981.
m Yours trul,
O j
1 N1 n 3
li s
. P. McGaughy, Jr.
//
EWC:mt Attachment cc:
Mr. N. L. Stampley Mr. Victor Stello, Director Mr. G. B. Taylor Mr. R. B. McGehee Div. of Insp. & Enforcement South Miss. Electric Mr. T. B. Conner U.S. Nuclear Regulatory Comm.
Power Association Washington, D.C.
20555 P. O. Box 1589 Hattiesburg, MS 3940 810I22031/
Member Middle South Utilities System
Attachment to AECM-81/27 Page 1 of 1 STATUS REPORT NO. 1 FOR PRD-80/70 I.
Description of Deficiency Flexible conduit contained in PGCC equipment, designed and sup-plied by General Electric Company, has a potential loss of solid metallic grounding at the termination cabinet and/or the panel.
In a typical termination cabinet installation, the conduit is firmly attached with a locking ring to a termination module.
This is an acceptable ground connection. However, the termin-ation module is ultimately mounted on a painted (high electri-cal resistance) surface. There was no procedure issued by C.E.
to insure that the paint was removed from panel surfaces before termination modules were mounted. Also, there has been no pro-cedure issued to check that the termination module makes a low-resistance connection to the panel steel.
II.
Approach to Resolution of the Deficiency The corrective action will require that a ground be attached at both ends of the conduit PGCC where inadequate grounding is found. For PGCC still in fabrication the recommended correc-tive action is removal of paint from grounding surfaces.
III. Status of the Proposed Resolution The NSSS Supplier is in the process of development of correc-tive actions. Our Constructor's Mansgement Corrective Action Report (MCAR)-103 is tracking thic s.2iciency and is available at GGNS.
IV.
Reason for Final Report Delay-Corrective actions by the NSSS Supplier have not been finalized or completed.
V.
Projected Final Report Date A final report on this deficiency is expected to be issued by March 19, 1981.
i