ML17318A321
| ML17318A321 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 09/19/1979 |
| From: | Maloney G INDIANA MICHIGAN POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| AEP:NRC:00162H, AEP:NRC:162H, NUDOCS 7910090791 | |
| Download: ML17318A321 (3) | |
Text
IhlDIANA R MICHIGAN POWER COMPANY
- p. o. Box 1e BOWLING GREEN STATION NEW YORK, N; Y. 10004 September 19, 1979 AEP;PRC;Q0162H Donald C.
Cook Nuclear Plant Units 1
and 2
Docket Nos.
50-315 and 50-316 License Nos.
G. Keppler, Director U.S. Nuclear Regulatory Commission, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137
Reference:
(1)
IE Bulletin 79-02 Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts, Dated 3/8/79; Revision 1, Dated 6/21/79 (2)
Submittal No. AEP:NRC:00162, Dated July ll, 1979 (3)
Submittal No. AEP:NRC:00162G, Dated August 12, 1979
Dear Hr. Keppler:
This letter represents an update of the work being performed in response to the above referenced IE Bulletin.
Anchor Bolt Testin Field testing of the anchor bolts in the Auxiliary and Turbine 'Buildings of Unit 2 is now complete and most of the failed bolts have been repaired and/or replaced.
We have tested 1005 of the accessible bolts in those areas, the inaccessible ones being approximately 1'A.
The failure rate encountered during testing has been approximately 14/.
Our Submittal No. AEP:NRC:00162 described the results of the Unit 1
and inside Unit 2 containment testing.
We consider the testing program completed.
A~1 We are a member of the utility group for the Teledyne Generic Program.
Teledyne Engjgqering Services (TES) has completed the Generic Program and the final report(
> was submitted by Teledyne to the NRC headquarters and to all four regional offices on September 7, 1979.
(*)
Report No. TR-3501-1, Revision 1, dated 8/30/79 p gQ fS7S
,'lk(009o79y
Mr. J.
G. Keppler, Director AEP:NRC:00162H The Generic Program addresses the following items of the Bulletin:
a)
The effect of cyclic loading on the anchor bolts.
The report concludes that concrete anchor bolts that are not preloaded do not deteriorate when subjected to cyclic loading.
b)
Actual design curves for shear-tension interaction.
The report con-cludes that linear interpolation for shear-tension interaction is highly conservative.
c)
Effect of base plate flexibilityon the anchor bolt loadings.
The report concludes that plate flexibilityshould be taken into account in determining, the load on concrete expansion anchor bolts.
d)
Safety factors on the various anchor bolt designs are as given in the bulletin.
The report concludes that testing results do not indicate a reason for applying different safety factors to different types of expansion anchors.
Specific analyses of base plates installed at the Cook Plant are being performed by Teledyne Engineering Services.
The following information is being taken into consideration in the plant specific analyses:
a)
The field testi'ng results to incorporate the as-built condition of the anchor bolts.
b)
Results of the Generic Program.
It is anticipated that the plant specific analyses and any required re-design of the pi'pe supports will be completed for both Units by October 31, 1979.
He wi,ll be submitti'ng to your office updates on the developments of the steps described in Attachment (5) of Reference (2).
y truly yours, GPN:em cc; R,
G, D.
R.
R.
C, Callen Charnoff V, Shaller
-Bridgman S. Hunter M. Jurgensen P,
Ma1 on Vice Presi en