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Information Notice No. 79- 14, NRC Position of Electrical Cable Support Systems
IN79014 June 4, 1979 MEMORANDUM FOR: B. H. Grier, Director, Region I J. P. O'Reilly, Director, Region II J. G. Keppler, Director, Region III K. V. Seyfrit, Director, Region IV R. H. Engelken, Director, Region V FROM: Harold D. Thornburg, Director, RCI:IE SUBJECT: Information Notice No. 79- 14, NRC POSITION OF ELECTRICAL CABLE SUPPORT SYSTEMS The subject Information Notice is transmitted for issuance on June 11, 1979. The Information Notice should be issued to all power reactor facilities with a construction permit. Also enclosed is a draft copy of the transmittal letter for this purpose. A copy of the memorandum R. J. Mattson to H. D. Thornburg and R. S. Boyd, dated February 21, 1979, is forwarded for your information. This letter provided the basis for this Information Notice but should not be distributed with the Notice. Harold D. Thornburg, Director Division of Reactor Construction Inspection Office of Inspection and Enforcement Enclosures: 1. IE Information Notice No. 79-14 2. Draft Transmittal Letter 3. Memorandum dated 2/21/79 CONTACT: W. Laudan, IE 49-27551 . (Draft letter to all applicants for, and holders of construction permits.) Information Notice No. 79- 14 Addressee: This Information Notice is being issued to call to your attention an aspect of the Commission's regulations which IE inspectors have found is not always being fully implemented. No written response is required. If you have questions regarding this matter, please contact me. Sincerely, Signature (Regional Director) Enclosure: IE Information Notice No. 79-14 . UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 June 11, 1979 Information Notice No. 79-14 SAFETY CLASSIFICATION OF ELECTRICAL CABLE SUPPORT SYSTEMS Summary: The NRC inspection staff has found that in several cases, facilities under construction have not applied the pertinent quality assurance requirements of 10 CFR 50, Appendix B to the design, procurement, and installation of cable trays and their support systems for Class IE electrical cables. This notice is being issued to all applicants for, and holders of construction permits, to remind them of the Commission's regulations on this subject. Description of Circumstances: 1. In the Commission's Regulations for Licensing of Production and Utilization Facilities - 10 CFR Part 50, Criterion 2 of Appendix A, states in part that "Structures, systems and components important to safety shall be designed to withstand the effects of....earthquakes ....without loss of capability to perform their safety functions...." 2. The Commission's Regulations on Reactor Site Criteria, Part 100, Appendix A, define a "safe shutdown earthquake," (SSE) and generally identify the structures, systems and components which are required to remain functional during such an earthquake. 3. Regulatory Guide 1.29 "Seismic Design Classification" states in pertinent part: "C.1. The following structures, systems and components of a nuclear power plant, including their foundations and supports (emphasis added) are designated as Seismic Category 1 and should be designed to withstand the effects of the SSE and remain functional. The pertinent quality assurance requirements of Appendix B to 10 CFR 50 should be applied to all activities affecting the safety related functions of these structures, systems and components." "C1.q. The Class IE electric systems, including the auxiliary systems for the on-site electric power supplies, that provide the emergency electric power..." No written response to this information notice is required. If you have question's regarding the matter, please contact the Director of the appropriate NRC Regional Office.
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