ML19254F717
| ML19254F717 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 10/31/1979 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 7911160474 | |
| Download: ML19254F717 (2) | |
Text
7 THE CLEVELAND ELECTRIC ILLUMIR ATING COMPANY ILLUMINATING BLDG o PUBUC SQUARE e CLEVELAND, OMIO 44101 e TELEPHONE (216) 623-1350 e MAIL ADDRESS: P. O. BOX 5000 Dalwyn R. Davidson vtCE PRESIDENT SYSTEM ENGINEERtNG AND CONSTRUCTION October 31, 1979 Mr. James G. Keppler Director, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Coccission 799 Roosevelt Road Glen Ellyn, Illinois 60137 RE: Perry Nuclear Power Plant Interim Report on Splitting of Rockbestos Cable Jacket
Dear Mr. Keppler:
This letter is an interim report as required by 10CFR50 55(e) on the deficiency concerning Rockbestos Company cable.
This item was first discussed in a telephone conversation between W. J. Kacer and T. A.
Eoss of The Cleveland Electric Illuminating Company, and Mr. Jack Hughes of the NRC Region III, Office of Inspection and Enforcement on October 3, 1979 Description of Deficiency Rockbestos Company was contracted by The Cleveland Electric Illu=inating Company to canufacture Class IE small power and control cable for Perry Nuclear Power Plant. During installation of this cable in non-safety related systems, it was discovered that the cable jacket was slit in a number of places. Further inspection revealed that 4 out of 17 reels of cable inspected contained slits in the outer hypalon jacket.
Al-though this inspec' tion only accounts for 1.k% of the total cable re-ceived, it is felt that the percentage gf reels found to contain slits is significant. These slits bring' about serious concern that the cable jacket will be able to fulfill its intended functions of containing and protecting the individual conductors, as well as, providing fire retardency and moisture resistence. Since slits have been found in cable scheduled for safety as well as non-safety systems, it is felt that the cable could adversely affect the safe operation or shutdown of the nuclear power plant.
1347 132 Bo/7 S6
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31 Mr. James G. Keppler October 31, ISrt9 Discussion of this' problem with Rockbestos representatives revealed that the slits occurred during the canufacturing process. During extrusion, an outer jacket is placed over the hypalon jacket to aid in the extrusion process. After extrusion is completed this outer jacket is removed by longitudinally cutting, then peeling off the extrusion jacket.
It was pointed out that the cutting is apparently being made too deep in some instances and cutting the final hypalon jacket. Because of the nature of this deficiency, extensive evaluation or extensive repair will be required to establish the adequacy of the cable jacket to perform its intended function. At the present time CEI is working with Rockbestos Cc=pany to develop a test program to determine whether the cable can be utilized without adversely affecting its safe operation and intended function. Tests will include elongation and tension, cold bend, de-for=ation, crushing, dielectric breakdown after glancing impact and dielectric breakdown after scoring. These and other tests will be conducted at the Rockbestos facilities in November and a final rep' ort will be submitted to the NRC by December 21, 1979 Very truly yours, r' m b
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Dalwyn. Davidson Vice President System Engineering and Construction DRD:ge cc: Victor Stello, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 1347 133
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