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Information Notice No. 79- 28, Overloading of Structural Elements Due to Pipe Support Loads
IN79028 November 16, 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: Norman C. Moseley, Director, Division of Reactor Operations Inspection, Office of Inspection and Enforcement SUBJECT: Information Notice No. 79- 28, OVERLOADING OF STRUCTURAL ELEMENTS DUE TO PIPE SUPPORT LOADS The subject Information Notice No. should be dispatched on November 16, 1979 to all power reactor facilities with an operating license or construction permit. Enclosed is a draft copy of the transmittal letter for this purpose. Norman C. Moseley, Director Division of Reactor Operations Inspection Office of Inspection and Enforcement Enclosures: 1. Draft Transmittal Letter 2. Information Notice No. 79-28 CONTACT: H. J. Wong, IE 49-28180 . (Draft letter to all power reactor facilities with an operating license or construction permit) Information Notice No. 79-28 Addressee: The enclosed Information Notice No. 79-28 provides information on the overloading of structural elements due to pipe support loads. Sincerely, Signature (Regional Director) Enclosures: 1. Information Notice No. 79-28 2. Recently Issued IE Information Notices . Attachment 1 SSINS No.: 6870 Accession No.: 7910250475 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 November 16, 1979 Information Notice No. 79-28 OVERLOADING OF STRUCTURAL ELEMENTS DUE TO PIPE SUPPORT LOADS Description of Circumstances: Recently, the NRC was informed that, in the course of the inspections pursuant to IE Bulletin No. 79-02 and 79-14 by the Portland General Electric Co. (PGE) at the Trojan Nuclear Plant, some walls were found which did not have adequate structural strength to sustain the required support reactions. Bechtel Corporation was the Architect Engineer for the plant. These structural inadequacies were reported to be attributable to two deficiencies: 1) Apparent lack of a final check of certain pipe support locations and reactions to ensure that the supporting structural elements possessed adequate structural integrity to sustain the required loads. 2) Inadequate design criteria for the reactions from supports anchored into the face of concrete block walls; e.g., relying on the combined strength of double concrete block walls without positive connection between the two walls by means other than the bond provided by layer of grout between them. The NRC is currently pursuing these issues in detail for the Trojan Nuclear Plant to determine the extnet of these deficiencies and the generic implications for other Bechtel facilities. This Information Notice is provided as an early notification of a possible significant matter. It is expected that recipients will review the information for possible applicability to their facilities and the actins being performed under IE Bulletin No. 79-02. Specific action is being requested relating to the adequacy of attachments to concrete block walls under IE Bulletin No. 79-02, Revision 2, item 5.c. No specific actions are requested in response to this Information Notice. If NRC evaluations so indicate, further licensee actions may be requested or required. If you have any questions regarding this matter, please contact the Director of the appropriate NRC Regional Office. No written response to this Information Notice No. is required.
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