Information Notice 1979-28, Overloading of Structural Elements Due to Pipe Support Loads

Overloading of Structural Elements Due to Pipe Support Loads

ML031180186
Person / Time
Site:	05000000
Issue date:	11/16/1979
From:	NRC/IE
To:
References
IN-79-028, NUDOCS 7910250485
Download: ML031180186 (2)

SSINS NO: 6870 tAccession No.: 791025O4X5UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF INSPECTION AND ENFORCEMENTWASHINGTON, D.C. 20555November 16, 1979IE Information Notice No. 79-28OVERLOADING OF STRUCTURAL ELEMENTS DUE TO PIPE SUPPORT LOADS

Description of Circumstances

Recently, the NRC was informed that, in the course of the inspections pursuantto IE Bulletin No. 79-02 and 79-14 by the Portland General Electric Co. (PGE) atthe Trojan Nuclear Plant, some walls were found which did not have adequatestructural strength to sustain the required support reactions. Bechtel Corporationwas the Architect Enaineer for the plant. These structural inadequacies werereported to be attributable to two deficiencies:1) Apparent lack of a final check of certain pipe support locations and reactionsto ensure that the supporting structural elements possessed adequatestructural integrity to sustain the required loads.2) Inadeouate design criteria for the reactions from supports anchored intothe face of concrete block walls; e.g., relying on the combined strengthof double concrete block walls without positive connection between thetwo walls by means other than the bond provided by a layer of grout betweenthem.The NRC is currently pursuing these issues in detail for the Trojan Nuclear Plantto determine the extent of these deficiencies and the generic implications forother Bechtel facilities.This Information Notice is provided as an early notification of a possible signif-icant matter. It is expected that recipients will review the information forpossible applicability to their facilities and the actions being performed underIE Bulletin No. 79-02. Specific action is being requested relating to the adequacyof 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 orrequired. If you have any questions regarding this matter, please contact theDirector of the appropriate NRC Regional Office.No written response to this IE Information Notice is required.

IE Information Notice No. 79-28November 16, 1979RECENTLY ISSUEDIE INFORMATION NOTICESEnclosureInformationNotice No.SubjectDateIssuedIssued To79-2779-12A79-2679-2579-24Steam Generator Tube 11/16!:Ruptures At Two PWRFacilitiesAttempted Damage To New 11/9/7'Fuel AssembliesBreach of Containment 11/5/79IntegrityReactor Trips At Turkey 10/1/79Point Units 3 And 4Overoressurization Of 10/1/79Containment Of A PWR PlantAfter A Main Steam LineBreakEmergency Diesel Generator 9/26/79Lube Oil CoolersQualification of Control 9/14/7iSystemsTransportation and Commercial 9/7/79Burial of Radioactive Material79 All Power reactor facilitiesholding OLs and CPsAll Fuel Facilities,research reactors, andDower reactors with anOL or CPAll power reactor facilitiesholding OLs and CPsAll nower facilities withan OL or a CPAll power reactor facilitieswith a CPAll power reactorfacilities holding OLsand CPs79-2379-2279-219 All Dower reactorfacilities withoperating licensesand construction permits.All power and researchreactors with OL'sAll Holders of ReactornLs and CPs and ProductionLicensees with Licensednperators79-20(Rev. 1)NRC Enforcement PolicyNRC Licensed IndividualsNRC Enforcement PolicyNRC Licensed Individualsc9/7/7979-208/14/79 All Holders of ReactorOLs and CPs and ProductionLicensees with LicensedOnerators