ML20085B857
| ML20085B857 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 06/30/1983 |
| From: | Oprea G HOUSTON LIGHTING & POWER CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-PT21-83-001-000 10CFR-50.55E, PT21-83-001-000, PT21-83-1, ST-HL-AE-974, NUDOCS 8307080476 | |
| Download: ML20085B857 (3) | |
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The Light co m P m Y >>""-">ixi"i"x&i"<-
i " io 'it"" ii"""".i<' - 77""i <7's>22 - 2'i June 30, 1983 ST-HL-AE-974 File Number: G12.104 Regional Administrator, Region IV
)%[I Mr. John T. Collins U. S. Nuclear Regulatory Commission i
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611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 b
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Dear Mr. Collins:
South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Final Report Concerning Rockbestos Company Coaxial Cable On October 26, 1981, pursuant to 10CFR50.55(e), Houston Lighting & Power Company (HL&P) notified your office of an item concerning cable manufactured by Rockbestos used in electrical penetrations supplied by Westinghouse.
The Rockbestos Company had informed Westinghouse of a potential for failure of certain coaxial cables.
The General Atomic Company has previously filed a 10CFR21 report regarding similar Rockbestos coaxial cable.
Attached is our final report on this matter.
If you have any questions on this item, please contact Mr. Michael E. Powell at (713) 877-3281.
Very truly yours, if, rW
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,/O'prea Jr.
Executive Vice President SSR/mg Attachment i
f[f 8307080476 830630 gDRADOCK05000 f E-y
Final Report Concerning i
Rockbestos Company Cable Summary On October 26, 1981, pursuant to 10CFR50.55(e), Houston Lighting & Power Company notified your office of an item concerning cable manufactured by the Rockbestos Company used in electrical penetrations supplied by Westinghouse.
Rockbestos had informed Westinghouse of a potential for failure of certain i
triaxial cables. On November 25, 1981, HL&P reported to your office that a test program to determine the appropriate corrective measures was underway at Rockbestos.
Bechtel has reviewed the proposed corrective action by Rockbestos and Westinghouse and determined that a suitatile replacement cable will be used in place of the originally supplied triaxial cable.
Descriotion of Deficiency The deficiency was a failure of triaxial cable during aging at elevated temperatures due to thermal expansion of the dielectric material and extrusion of dielectric thru the interstices of the shield. This is a non-reversible process which upon cool-down causes voids to form in the dielectric. Thus, the originally supplied RSS-6-108 cable had not been l
demonstrated to be capable of qualification to the required environmental conditions.
j Corrective Action Rockbestos has provided Bechtel with qualification reports for a replacement cable RSS-6-109 (second generation triaxial cable). Due to the similarity of the cables the report also applies to second generation RSS-6-108 cable.
Rockbestos has shown that the problem occurs only at the artificially elevated temperatures used for aging of the dialectric and not at the temperatures experienced by the cable in normal and post accident environment. This problem was resolved by aging of the cable and dielectric without the outer shield and jacket. The fabrication process for the test samples was then completed and the LOCA testing of the cable performed successfully.
In addition to this revised aging and test sequence, the braid design of the shield has been changed.
Bechtel has reviewed these reports and considers them technically acceptable.
Therefore, the decision is to use second generation RSS-6-108 cable as a replacement for use in the Westinghouse electrical penetrations.
Westinghouse has concurred with this decision.
In addition, Bechtel has decided to utilize second generation cable for certain special applications of field cabling inside the containment.
Safety Analysis The originally supplied triaxial cable has not been demonstrated to be adequately qualified. Therefore, it is conservatively assumed that the original supplied cable would fail under these conditions and could not be relied upon to provide safety-related functions associated with Nuclear Instrumentation.
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f Ilouuon 1.ighting & l'ower Coniluny June 30, 1983 cc:
G. W. Oprea, Jr.
ST-HL-AE-974 J. H. Goldberg File Number: G12.104 J. G. Dewease Page 2 J. D. Parsons D. G. Barker
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M. R. Wisenburg i
R. A. Frazar J. W. Williams R. J. Maroni 1
J. E. Geiger i
H. A. Walker S. M. Dew J. T. Collins (NRC)
H. E. Schierling NRC)
W. M. Hill, Jr.
NRC)
M. D. Schwarz Baker & Botts) l R. Gordon Gooch (Baker & Botts)
J. R. Newman (Lowenstein, Newman, Reis, & Axelrad)
STP RMS Director, Office of Inspection & Enforcement Nuclear Regulatory Commission 1
Washington, D. C. 20555 G. W. Muench/R. L. Range Charles Bechhoefer, Esquire Central Power & Light Company Chairman, Atomic Safety & Licensing Board P. O. Box 2121 U. S. Nuclear Regulatory Commission Corpus Christi, Texas 78403 Washington, D. C.
20555 1
H. L. Peterson/G. Pokorny Dr. James C. Lamb, III City of Austin 313 Woodhaven Road i
P. O. Box 1088 Chapel Hill, North Carolina 27514 Austin, Texas 78767 J. B. Poston/A. vonRosenberg Mr. Ernest E. Hill City Public Service Board Lawrence Livermore Laboratory P. O. Box 1771 University of California San Antonio, Texas 78296 P. O. Box 808, L-46 Livermore, California 94550 Brian E. Berwick, Esquire William S. Jordan, III Assistant Attorney General Harmon & Weiss for the State of Texas 1725 I Street, N. W.
P. O. Box 12548 Suite 506 i
Capitol St7 tion Washington, D. C.
20006 l
Lanny Sinkin Citizens for Equitable Utilities, Inc.
Citizens Concerned About Nuclear Power c/o Ms. Peggy Buchorn 5106 Casa Oro Route 1, Box 1684 San Antonio, Texas 78233 Brazoria, Texas 77422 i
Robert G. Perlis, Esquire Hearing Attorney Office of the Executive Legal Director U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Revision Date 04-29-83
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