ML19310A036
| ML19310A036 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 05/08/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Burstein S WISCONSIN ELECTRIC POWER CO. |
| References | |
| NUDOCS 8005210070 | |
| Download: ML19310A036 (1) | |
Text
TO e
un nowg UNITED STATES
~
l'
/n NUCLEAR REGULATORY COMMISSION y,
N7j,. E REGION 111 g
o, 799 ROOSEVELT ROAD
% ' b#
o GLEN ELLYN,ILLINOls 60137
- ...+
Docket No. 50-266 MAY 8 S80 Docket No. 50-301 Wisconsin Electric Power Company ATTN:
Mr. Sol Burstein Executive Vice President Power Plants 231 West Michigan Milwaukee, WI 53201 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, gA d Y.D+d M b James G. Keppler Director
Enclosure:
IE Bulletin No. 80-11 cc w/ encl:
Mr. G. A. Reed, Plant Manager Central Files Director, NRR/DPM Director, NRR/ DOR C. M. Trammell, ORB /NRR PDR Local PDR NSIC TIC Sandra A. Bast, Lakeshore Citizens for Safe Energy Mr. John Duffy, Chief Boiler Inspector, Department of Industry, Labor and Human 1
Relations 8005210070 l
SSINS No.:
6820 Accession No.:
UNITED STATES 7912190695 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 May 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 Se'smic 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).
Thc problem was that soue 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 walls without substantial positive connection 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 datail, 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 wall pipe supports in this category, the e bolting through the wall or the supp Supports that are bolted through maso DUPLICATE DOCUMENT review for this Bulletin.
Entire dccu:nent previously entered into system under:
ANO 7 Q l Z l 8l @ f 8) f No. of pages:
g[
SSINS No.:
6820 Accession No.:
UNITED STATES 7912190695 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENThp WASHINGTON, D.C.
20555 May 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 Electr'c 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 1
into the face of concrete masonry walls; e.g., relying on the combined strength of double block walls without substantial positive connection between the two walls by means other than the bond provided by a layer of mortar, grout or concrete between them.
l 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 l
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 supports 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.
'1 i