ML20037C339
| ML20037C339 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 01/30/1981 |
| From: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| AECM-81-51, NUDOCS 8102040412 | |
| Download: ML20037C339 (2) | |
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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. BOX 16 4 0, J A C K S O N. MISSISSIPPI 39205 TuO[,,rY[S?Uo7/r" January 30, 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 Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/05, Status Report No. 3, Electrical Cable Insulation Damaged During Pulling Process AECM-81/51 On March 13, 1980, Mississippi Power & Light Company notified Mr. F. Cantrell of your office of a Potentially Reportable Defi-ciency (PRD) at the Grand Gulf Nuclear Station (CGNS) construction site. The deficiency concerns electrical cable insulation damage sustained during the cable pulling process.
Our study of the extent and implications of this problem is continuing. We expect to provide to you our final report and deter-mination of reportability on this matter by May 19, 1981. Our findings and corrective actions, to date, are su:::marized in the attached status report.
Yours truly, Yhhk g J. P. McGaughy, Jr.
/ [
CWH:mt Attachment cc:
Mr. N. L. Stampley O
ctor Stello, Director Mr. G. B. Taylor Mr. R. B. McGehee Div. of Insp. & Enforcement South Miss. Electric Mr. T. B. Conner U. S. Nuclear Reg. Comm.
Power Association Washington, D.C. 20555 P. O. Box 1589 Hattiesburg, MS 39401 t3S Member Middle South Utilities System
o Attachment to AECM-81/51 f
Page 1 of 1 STATUS REPORT NO. 3 FOR PRD-80/05 I.
Description of the Deficiency Cable damage was sustained during the cable pulling process.
Two constructor Nonconformance Reports (NCR) have documented this condition in two noted cases of cable damage.
In both cases, the damaged cables are associated with Control Room HVAC System (Z51). The initial findings have indicated that the cables were damaged by the polypropylene pulling rope. The nature of damage ranges from jacket chafing to insulation cut through to the conductor. The condition was noted when all cables were removed from their common conduit to allow the pulling of an additional cable in that conduit.
The deficiency, limited to the damaged items referenced above, voi:1d not have adversely af fected the safety of plant operations.
A statement on the overall safety implications of this deficiancy cannot be made until the extent of the problem has been deter-mined.
II.
Approach to Resolution of the Problem / Status of Proposed Resolutions The damaged cables identified in the above mentioned constructor's NCR's have been replaced. This matter is documented and filed under Bechtel Manage =ent Corrective Action Report (MCAR)-GGNS No. 64.
This file is available for your review at the construc-tion site.
The extent of the problem is currently under review by our con-structor. Approximately 400 conduits have been identified and an inspection plan is being formulated. It is expected that the inspection and subsequent engineering evaluation will be com-pleted by the end of April, 1981.
To preclude recurrence of this deficiency, the Project Field Engineer issued an Information Bulletin modifying cable instal-lation practices. A training session was conducted for respon-sible Field Engineers to identify the problem and provide in-structions-for the modified pulling practices.
A test to identify damaged cable using polywater and a Hi-pot test has been developed. Twenty " worst case" conduits were selected for the test and results will be analyzed by the Architect / Engineer.
Fifteen of the conduits have been tested to date, with no failures due to the cable pulling process.
III. Reasons for Delay in Final Report Constructor / Architect / Engineer's investigation not complete.
IV.
Projected Date of Final Report We anticipate filing a final report, to include a determination on reportability, cnt or before May 19, 1981.