ML19260B502
| ML19260B502 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 11/16/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7912100273 | |
| Download: ML19260B502 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION
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WALNUT CREEK, CALIFORNIA 94596 November 16, 1979 Docket Nos. 50-133 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
The enclosed IE Information Notice No. 79-28 provides information en the overloading of structural elements due to pipe support loads.
Sincerely, C
- R. H. Engelken Director Enclosures :
1.
IE Information Notice. No. 79-28 2.
Recently Issued IE Information Notices cc w/ enc:
W. Barr, PG&E W. Raymond, PG&E R. Ramsay, PG&E, Diablo Canyon E. Weeks, PG3E, Humboldt Bay J. Worthington, PG&E 1521 303 7912100 M 3
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SSINS NO: 6870 g
accession No.: 79102504T5 UNITED STATES NUCLEAR REGULATORY C0!' MISSION OFFICE OF INSPECTION AND ENFORCE?iENT WASHINGTON, D.C.
20555 November IS, 1979 IE Information Motice No. 79-28 0'/ERLOADING OF STRUCTURAL ELE!!ENTS DUE TO PIDE SUPPORT LOADS Descriotion of Circumstances:
Recently, the !!PC was infomed that, in the course of the insoections oursuant 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 adeauate structural strength to sustain the required succort reactions. Eechtel Corcoration was the Architect Enoineer for the plant. These structural inadequacies were recorted to be attributable to two deficiencies:
- 1) Apparent lack of a final check of certain nice support locations and reactions to ensure that the suoportina structural eierants possessed adeauate structural integrity to sustain the reauired loads.
2)
Inadeouate design criteria for the reactions from succorts anchored into the face of concrete block walls; e.g., relying on the corbined strength of double concrete block walls without oositive connection between the two walls by means other than the bond provided by a layer of grout between them.
The NRC is currently pursuing these issues in detail for the Trojan Nuclear Plant to detemine the extent of these deficiencies and the generic implications for other Bechtel facilities.
This Information Notice is provided as an earlv notification of a cossible sionif-icant matter.
It is expected that recioients will review the infomation for oossible aoplicability to their facilities and the actions beinc cerforned under IE Gulletin No. 79-02. Specific action is beinq requested relating to the adecuacy of attachments to concrete block walls under IE Bulletin No. 79-02, Revision 2, itam 5.c.
No soecific actions are reauested in resoonse to this Information Notice.
If NRC evaluations so indicate, further licensee actions nay be reauested or reouired.
If you have any questions recarding this matter, please contact the Director of the acoropriate NRC Regional Office.
No written resconse to this IE Infomation Notice is required.
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IE Information Notice No. 79-28 Enclosure November 16, 1979 OECENTLY ISSUED IE INFOR"ATION NOTICES Information Subject Date Issued To Notice No.
Issued 79-27 Steam Generator Tube 11/iC/79 All cower reactor facilities Ruotures At Two PWR holding OLs and cps Facilities79-12A Attenoted Damage To '!ew 11/9/79 All Fuel Facilities, Fuel Assenblies research reactors, and cower reactors with an OL or CP 79-26 Breach of Containment 11/5/79 All cower reactor facilities Intearity holding Ols and C?s 79-25 Reactor Trips At Turkey 10/1/79 All cower facilities with Point Units 3 And 4 an OL or a CP 79-24 Overoressurization Of 10/1/79 All power reactor facilities Containment Of A PWR Plant with a CD After A Main Steam Line Break 79-23 Emergency Diesel Generator 9/26/79 All cower reactor Lube Oil Coolers facilities holding OLs and cps 79-22 Qualification of Control 9/la/79 All cower reactor Systems facilities with operating licenses and construction permits.
79-21 Transoortation and Commercial 9/7/79 All oower and research Burial of Radioactive Material reactors with OL's 79-20 NRC Enforcement Policy 9/7/79 All Folders of Reactor (Rev.1)
NRC Licensed Individuals OLs and cps and Production Licensees with Licer ed Onerators 79-20 NoC Enforcenent Policy 9/14/79 All Polders of Reactor NRC Licensed Individuals OLs and cps and Production Licensees with Licensed Coerators
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