ML19257A631
| ML19257A631 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 12/13/1979 |
| From: | Huston R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-79-02, IEB-79-2, NUDOCS 8001070059 | |
| Download: ML19257A631 (3) | |
Text
-
'Fl C Consumers Power Company a.n.r.i ome..: mis w..i uicnia.n Av.no., s cm.on, uicnia.3 4o2oi. 4,.. coa. siv 7se csso December 13, 1979 Mr James G Keppler Office of Inspection and Enforcement Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-155 - LICENSE DFR BIG ROCK POINT PLANT - PJ3PONSE TO IE BULLETIN 79-02, REV 2, ITEM 8
Reference:
Letter D P Hoffman to J G Keppler dated July 6, 1979.
Item 8 of IE Bulletin 79-02, Revision 2 (Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts) dated November 8, 1979 requested licensees of pover reactor facilities to complete Items 5, 6 and 7 within 30 days of date of subject IE Bulletin.
Consumers Power Company's response to Items 5, 6 and 7 follows.
R r
Huston Senior Licensing Engineer CC Director, Of fice of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement Attachment (2 Pages) g]
1692 087 g
800107o o sc)
Item 5 - Determine the extent that expansion anchor' bolts were used in concrete block (masonry) walls to attach piping supports in Seismic Category 1 systems (or safety-related systems as defined by Revision 1 of IE Bulletin 79-02).
If expansion anchor bolts were used in concrete block walls:
a.
Provide a list of the systems involved, with the number of supports, type of anchor bolt, line size, and whether these supports are accessible during normal plant operation.
b.
Describe in detail any design consideration used to account for this type of installation.
Provide a detailed evaluation of the capability of the supports, c.
including the anchor bolts, and block wall to meet the design loads. The evaluation must describe how the allowable loads on anchor bolts in concrete block walls were determined and also what analytical method was used to determine the integrity of the block walls under the imposed loads. Also, describe the acceptance criteria, including the numerical values, used to perform this evaluation. Review the deficiencies identified in the Information Notice on the pipe supports and walls at Trojan to determine if a similar situation exists at your facility with regard to supports using anchor bolts in concrete block walls.
d.
Describe the results of testing of anchor bolts in concrete block walls and your plans and schedule for any further action.
Response to Item 5 The above condition does not exist on systems affected by IE Bulletin 79-02 at the Big Rock Point Plant. Therefore, this item is not applicable.
Item 6 - Determine the extent that pipe supports with expansion anchor bolts used structural steel shapes instead of baseplates. The systems and lines reviewed must be consistent with the criteria of IE Bulletin 79-02, Revision 1.
If expansion anchor bolts were used as described above, verify that the anchor bolt and structural steel shapes in these supports were included in the actions performed for the bulletin.
If these supports cannot be verified to have been included in the bulletin actions:
Provide a list of the systems involved, with the number of a.
supports, type of anchor bolt, line size, and whether the supports are accessible during normal plant operation.
b.
Provide a detailed evaluation of the adequacy of the anchor bolt design and installation. The evaluation should address the assumed distribution of loads on the anchor bolts. The evaluation can be based on the results of previous anchor bolt 1692 088
2 P
testing and/or analysis which substantiates operability of the affected system.
Describe your plans and schedule for any further action necessary c.
to assure the affected systems meet Technical Specifications operability requirements in the event of an SSE.
Response to Item 6 Upon investigation of the affected systems, it was determined that two (2) supports exist utilizing angle iron as a base. These items were included within the scope of the bulletin and inspected during the initial inspection program.
Item 7 - For those licensees that have had no extended outages to perform the testing of the inaccessible anchor bolts, the testing of anchor bolts in accessible areas is expected to be completed by November 15, 1979.
The testing of the inaccessible anchor in. lts should be completed by the next extended outage. For those licensees that have completed the anchor bolt testing in inaccessible areas, the testing in accessible areas should continue as rapidly as possible, but no longer than March 1, 1980. The analysis for the bulletin items covering baseplate flexibility and factors of safety should be completed by November 15, 1979. Provide a schedule that details the completion dates for IE Bulletir 79-02, Revision 2, Items 1, 2 and 4.
Response to Item 7 Big Rock Point was in an extended outage during bulletin implementation.
Therefore, plant operations were not a factor considered during any determination of inaccessibility.
Conclusion Anchor bolt preload is being investigated at this time.
If the results indicate further bulletin-related action is necessary, it will be pursued at that time.
See reference letter for scope of tests and descriptions.
1692 089