ML20040C843
| ML20040C843 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 01/04/1982 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, L-82-3, NUDOCS 8201290299 | |
| Download: ML20040C843 (4) | |
Text
{{#Wiki_filter:P.O. BOX Sf3100 MI AMI, F L 33152 f 'I y L,Op% PO1!ER & LIGHT COMPANY Q' j f'l I January 4,1982 L-82-3 + / Mr. James P. O'Reilly I_'/ RECEIVED 4 Regional Administrator, Region II U. S. Nuclear Regulatory Commission 7 J AN 2 71982* 1 101 Marietta Street, Suite 3100 9' u mag ramr enus Atlanta, Georgia 30303 " {f" C> P
Dear tir. O'Reilly:
A o Re: RII:JP0 50-389 Rockbestos Cables On December 4,1981, FPL identified, via telecon, a potential 10 CFR 50.55(e) condition existing on this site involving certain coaxial cables supplied by Rockbestos Company. A final report discussing the resciution is attached for your review. Very truly yours, W,Y k J1obert E. Uhrig Vice President Advanced Systems & Technology REU/DME/ah cc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Conmission Washington, D. C. 20555 Harold F. Reis, Esquire UplilLlAL COPT. i 8201290299 820104 / [
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.s I FINAL DEFICIENCY REPORT ROCKBESTOS CABLES Name of Station: St. Lucie Plant - Unit 2 Owner: Florida Power & Light Company Architect / Engineer: Ebasco Services Incorporated Date NRC Notified: December 4, 1981 Final Report File: January 4,1982 4 i i
r I Sunnary A potential deficiency was identified in certain coaxial cables supplied by Rockbestos Company, in which the cables were subject to failure in an adverse environment with temperatures above 230 F. This problem was first identified by General Atomic Company who used these Rockbestos cables in their equip-ment and submitted a Part 21 report to the NRC. An investigation was undertaken for St. Lucie Unit 2 and it has been identified that these cables were specified to be used for some safety related system components (excore nuclear instrumentation and containment radiation monitoring), located inside containment and were partially installed. This deficiency involving the Rockbestos cables is deemed reportable under 10 CFR 50.55(e). FPL notified the NRC of this deficiency existing in St. Lucie Unit 2 site as a potentially reportable event on December 4,1981. This final report is submitted to advise the NRC of the description of the deficiency and corrective action that is being taken. II Description The subject Rockbestos cables are of solid dielectric coaxial construction with a braided shield. Expansion of the dielectric when heated causes foreshortening of the braided shield which in turn results in longitudinal compression and kinking of the center conductor. This kinking, combined with heat may cause mechanical and/or thermal stress cracking of the polymer LD inner layer, permitting electrical failure. Cables of this type which were purchased for operation under design basis accident conditions insjde containment are thus found to be subject to potential failure above 230 F. The following Class IE systems / components were specified to use these cables; the status of cable installation is also indicated; a) Excore nuclear instrumentation (neutron detectors) - Cables are already installed inside containment. b) Containment radiation monitors - Cables are not I installed yet. III Corrective Action l The B/M (bill of material) number of these affected cables were identified l and installation of these cables has been stopped. These cables will be replaced by qualified cables provided by the vendor (Rockbestos) according to a site correction procedure. IV Safety Implications l The affected system / components include the excore nuclear instrumentation l and containment radiation monitors which are safety related. The deficiency is considered as a deviation from performance specifications and it has been concluded that the safety of operation of the nuclear power plant could have
.= - been adversely affected sometime throughout the expected lifetime of the plant, if the cable deficiency were to have remained uncorrected. V Conclusion Corrective action as indicated in Section III of this report will be undertaken. This closes out this item for St. Lucie Unit 2 as regards to 10 CFR 50.55(e) requirements.
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