ML20062J556
| ML20062J556 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 09/25/1980 |
| From: | Renberger D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 1OCFR-50.55E, GO1-80-278, IEB-79-02, IEB-79-2, NUDOCS 8010300684 | |
| Download: ML20062J556 (7) | |
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G01-80-278 fir. R.11. Engel ken, Director flucicar Regulatory Commission Region V Suite 202 Walnut Creek Plaza 1900 it. California Boulevard Walnut Creek, California 94596
Dear fir. Engelken:
Subject:
WPPSS fluclear Projects flos.1/4 IE Bulletin flo. 79-02, Revision 2,
" Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts" and Reiated Reportable Condition 10CFR50.55(e)
Pipe Support Design
Reference:
G01-80-50, DL Renberger to RH Engelken, dated January 24, 1980 The reference letter provided the Supply System response to IE Bulletin 79-02 Revision 2, as well as informed you of a reportable condition under 10CFR50.55(e) with respect to ASi1E III, Seismic. Category I pipe supports.
This letter revises our commitments and provides a status with revised completion dates.
1.
Verification that base plate flexibility was accounted for in calcula ting anchor bolt loads.
Recalculate anchor bolt loads on existing designs by June 1980.
Status:
Completion has been rescheduled to February 28, 1981.
2.
Completion of items 1-6 (of the reference letter) for installed pipe supports with concrete anchor bolts.
Obtain torque vs preload data for Hilti Kwik bolts in time to support a June 1980 resolution to all existing designs.
S ta tus :
Testing was completed in July 1980.
Final results are expected from liilti in September 1980. Actual torque values for each hanger design will be known in September and will be completed for each hanger during the review until the 79-02 review is com-pleted in late February 1981.
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RH Engelken Page 2
- 3. of the reference letter lists an allowable load for only one (1) embedment depth of each bolt diameter. This table has now been expanded to include allowable loads for several embed-ment depths using the same diameter bolt.
Refer to attached revised ta bl es.
4 of the r.eference letter ' describing the 10CFR50.55(e) reportable condition m"st also be updated as follows:
As of August 1, 1980, 2,190 supports have been reviewed and 346 require modification. These modifications are relatively minor in nature, typically requiring additional weld length or a knee brace.
Of the 346 supports requiring modification, the.following types of problems have been found.
Helds 186 -
Concrete Anchors 83 U-bol ts 41 Stress 52 Other 61 t
Total 423 Note. Some supports are covered under more than one category.
Status: The 79-02 design review now in progress will be completed by February 28, 1981. Necessary design modifications are ongoing at this time and all design changes will be completed by March 15, 1981.
The reference letter identified the IE Bulletin 79-02, Revision 2 response, as well as the WPPSS final report on the reportable design deficiency. As the 79-02 design review and the reportable condition are ongoing and directly related, we wish to amend our response to read "UPPSS interim report on.the reportable design deficiency". We will advise you periodically of our progress j
in this area.
If you have any questions or require further information, please advise.
Very truly yours, D ~d D. L. Renberger Assistant Director of Technology jds A ttac hment cc: CR Bryant, Bonneville Power Administration JR Lewis, Bonneville Power Administration V. Stello,' Director, NRC Office of Inspection and Enforcement V. Mani, United Engineers & Conr.tructors, Philadelphia-AD Toth, Nuclear Regulatory Commission, Region V, WNP-2 l
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