ML19310A015
| ML19310A015 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, Zion  |
| Issue date: | 05/08/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8005210029 | |
| Download: ML19310A015 (1) | |
Text
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UNITED STATES
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'j NUCLEAR REGULATORY COMMISSION t
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- p" GLEN ELLYN, ILLINOIS 60137 WM 8 G80 Docket Nos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295, 50-304 Commonwealth Edison Company ATTN:
Mr. Cordell Reed Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen:
Enclosed is IE Bulletin No. 80-11 which requires action by you. A written response is required.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, f W $.Y A James G. Keppler Director
Enclosure:
IE Bulletin No. 80-11 cc w/enel:
Mr. D. L. Peoples, Director Director NRR/DPM of Nuclear Licensing Director NRR/ DOR Mr. B. B. Stephenson, PDR Station Superintendent Local PDR Mr. N. Kalivianakis, NSIC Plant Superintendent TIC Mr. N. Wandke, Plant Mr. Dean Hansell, Office Superintendent of Assistant Attorney General Central Files Myron M. Cherry, Chicago l
8005210029
DUPLICATE DOCUMrdT Entire document previously SSINS No.:
6820 entered into system under:
Accession No.:
D STATES 7912190695 ANO_ 7 9 / 1 / k Ot$ h [
ATORY COMMISSION TION AND ENFORCEMENT No. of pages:
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, D.C.
20555 8, 1980 IE Bulletin No. 80-11 MASONRY WALL DESIGN Description of Circumstances:
In the course of conducting inspections pursuant to IE Bulletin Nos. 79-02 and 79-14 at the Trojan Nuclear Plant, Portland General Electric Co. (PGE) identi-fied a problem with the structural integrity of concrete masonry walls with Seismic Category I piping attached to them.
This problem was briefly addressed in IE Information Notice No. 79-28, which was sent to all Construction Permit and Operating License holders on November 16, 1979 (Attachment 1).
The problem was that some walls were found which did not have adequate structural strength to sustain the required piping system support reactions.
These structural deficiencies were at that time 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 elements possessed adequate structural integrity to sustain the required loads.
2)
Non-conservative design criteria for the reactions from supports anchored into the face of concrete masonry walls; e.g., relying on the combined strength of double block wa'Is without substantial positive ;onnection between the two walls by means other than the bond provided by a layer of mortar, grout or concrete between them.
Continued investigations into the deficiencies identified at the Trojan Nuclear Plant, engineered by Bechtel, confirmed the deficiencies to be attributable to error in engineering judgment, lack of procedures and procedural detail, and inadequate design criteria (details are in Trojan Nuclear Plant's LER No. 79-15, and supplements).
Because of this and the generic implications of similar deficiencies with other operating facilities, we have concerns with regard to the adequacy of design criteria used for the design of masonry walls and an apparent lack of design coordination between the structural and piping / equipment design groups.
IE Bulletin 79-02, Revision 2 issued on November 8, 1979 required a review of pipe supports attached to masonry walls using expansion anchor bolts.
For most pipe supparts in this category, the expansion anchor bolts were replaced by bolting through the wall or the support was relocated to another structure.
Supports that are bolted through masonry walls are also to be considered in the review for this Bulletin.
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SSINS No.:
6870 UNITED STATES Accession No.:
NUCLEAR REGULATORY COMMISSION 7910250475 0FFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 Yf November 16, 1979 IE 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 signif-icant 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 IE Information Notice is required.
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