ML19260B510
| ML19260B510 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 11/16/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7912100283 | |
| Download: ML19260B510 (1) | |
Text
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}c, UNITED STATES U
NUCLEAR REGULATORY COMMISSION
$.,'7 s, [, *k,5 r
'p r REGION V o, "pd',g&1 J
1990 N. CALIFORN' 4 BOULEVARD 4
- ef SUITE 207. WALNUT CREEK PLAZA
- ,,,e WALNUT CREEK, CALIFORNI A 94596 November 16, 1979 Docket No. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe Assistant General Fanager Gentlemen:
The enclosed IE Information flotice No. 79-28 provides information on the overloading of structural elements due to pipe support loads.
Sincerely, W
a R. H. Engelken Director
Enclosures:
1.
IE Information Motice. No. ~3-28 2.
Recently Issued IE Information Notices cc w/ enc:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 1521 319 791'21 00 g83
SSINS NO: 6810 Accession No.: 79102504k5 UNITED STATES NUCLEAR REGULATORY C0" MISSION OFFICE OF INSPECTION AND ENFORCE"ENT WASHINGTON, D.C.
20555 November 15, 1979 IE Information Notice No. 79-23 OVEDLOADING OF STRUCTURAL ELE"ENTS DUE TO PIDE SUPPORT LOADS Descriotion of Circunstances:
Recently, the NPC was infomed that, in the course of the inscections pursuant to IE Bulletin No. 79-02 and 79-la by the Portland General Flectric Co. (PGE) at the Trojan Nuclear Plant, some walls were found which dici not have adequate structural strength to sustain the required succort reactions. Eechtel Corooration was the Architect Enoineer for the plant. These structural inadequacies were reoorted to be attributab'e to two deficiencies:
- 1) Apparent lack of a final check of certain nice support locations and reac-ions to ensure that the suoportino structural eierents possessed adequate structural integrity to sustain the reouired loads.
2)
Inadequate design criteria for the reactions from succorts anchored into the face of concrete block walls; e.g., relying on the corbined strenath of double cencrete block walls without oositive connection between the two walls by means other than the bond provided by a layer of arout between them.
The NRC is currently oursuing 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 early notification of a cossible signif-icant matter.
It is expected that recioients will review the infomation for oossible aoplicability to their facilities and the actions being perforced under IE Bulletin No. 79-02.
Specific action is being requested relating to the adecuacy of attachments to concrete block walls under IE Bulletin No. 79-02, Revision 2, item 5.c.
No saecific actions are recuested in rescanse to this Information Notice.
If NRC evaluations so indicate, further licensee actions may be requested or reouired.
If you have any questions recarding this matter, please contact the Director of the accropriate NRC Regional Office.
No written rescanse to this IE Infomation Notice is required.
1521 320
IE Inforna'. ion Notice No. 79-28 Enclosure November
., 1979 DECENTLY ISSUED IE INF0FMATION NOTICES Information Subject Date Issued To Notice No.
Issued 79-27 Steam Generator Tube 11/16/79 All oower reactor facilities Ruotures At Two PWR holding OLs and cps Facilities79-12A Atteroted Damage To P!ew 11/9/79 All Fuel Facilities, Fuel Assenblies research reactors, and cower reactors with an CL or CP 79-26 Breach of Containment 11/5/79 All power reactor facilities Inteority holding OLs and CDs 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 Contair. ment 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 9/14/79 All oower reactor Systems facilities with operating licenses and construction oernits.
79-21 Transoortation and Carmercial 9/7/79 All power and research Burial of Radioactive Material reactors with CL's 79-20 NRC Enforcement Policy 9/7/79 All Folders of Reactor (Rev.1)
Nic Licensed Individuals Ols and cps and Production Licensees with Licensed nnerators 79-20 NOC Enforcenent Policy 8/1a/79 All Holders of Reactor NPC Licensed Individuals Ols and cps and Production Licensees with Licensed Ocerators 1521 521