ML20030C138
| ML20030C138 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 07/23/1981 |
| From: | Dutton D GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, GM-659, NUDOCS 8108250430 | |
| Download: ML20030C138 (2) | |
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UCh}r Georgia Power Company
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a Post Office Box 4545 fg M Atlanta, Georgia 303o2 s
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Telephone 404 522-606o v
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Sotthern Company Services. Inc.
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C Barrrungham, Alabama 35202
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July 23,1980
'c [ h United States Nuclear Regulatory Connission File: X7BG03M5 Office of Inspection and Enforcement Log:
GM-659 Region II - Suite 3100 101 Marietta Street, fM Atlanta, GA 30303 Attention:
Mr. James P. O'Reilly
References:
RII JP0; 50-424; 50-425; Potential 10CFR50.55(e)
(Embed Plate Load Capacity Tables)
Gentlemen:
On January 28, 1980 it was reported to your office that a potential item under 10CFR50.55(e) existed at Plant Vogtle concerning embed plate load capacity table:. An evaluation for a significant deficiency and substantial safety hazard has been performed, and it has been concluded that this problem constitutes a significant deficiency and could have been a potential substantial safety hazard.
Bechtel Power Corporation has reported a Part 10CFR21 by letter dated July 7,1980 to Mr. Karl Seyfrit, Director of Region IV. Attached is the final report concerning the embed plate capacity load tables defi-ciency.
This response contains no proprietary information and may be placed in the NRC Public Document Room upon receipt.
Very trul C
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Doug Dutton Project Genera! Manager CWH:tp Attachment xc:
U. S. Nuclear Regulatory Commission Attention: Victor Stello, Jr., Director Office of Inspection and Enforcement Washington, DC 20555
' OFFiCLAL col'Y n108250430 810723 M
PDR ADOCK 05000424 Ns S
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Mr. James P. O'Reilly l
Embed Plate Load Capacity Tables
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July 23,1980 Page 2 i
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M. D. Hunt, NRC-Region II J. H. iiiller, Jr.
W. E. Ehrensperger F. G. Mitchell, Jr.
R. J. Kelly C. F. Whi tmer R. E. Conway D. E. Dutton J. T. Beckham, Jr.
R. W. Staffa l!
K. M. Gillespie L. T. Gucwa C. R. Miles, Jr.
E. D. Croover l
D. L. McCrary R. A. Thomas
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J. A. Bailey M. Z. Jeric i
B. L. Lex J
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Engineers - Construc' ors
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P O acu somo. TEow% ANNE 2. LOS ANGELES. CA: son %a scom TELEPHONF Gi3) >%4011 July 7, 1930 Mr. Karl Seyfrit Direct:r, ?.egion IV Office of Inspection and Inforcer.ent U.S. Nuclear Regulat: y Corr.ission 611 Ryan Pla a Drive, Suit 1000 Arlington, Te::as 75012
Subject:
Georgia Power Company Alvin W. Vogtle Nuclear Plant Bechtel Job 9510-001 Pctential Subctantial Safety Hasard/Significant Deficiency Report i
File X7BG03 Log BV 4077 i
References:
1.
Letter to Mr. Karl Seyfrit from Mr. B. L. Lex, dated Fn.
2, 1980, A,og BO-00 04 l
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Letter to Mr. Karl Se i.t from Mr.
B. L. Lex, dated.
- ary 31, 1980, Log BO-0003 3.
Letter to Karl Seyfri - : cor.
Mr.
B. L Lex, dated J..aary 29,1980 Log BO-0002
Dear Mr. Seyfrit:
The enclosed attachment titled Final Report is being transmitted to you under 10 CFR 21 requirements concerning the possible deficiency in the pipe support design, relative to subject l
above.
The interim reports were forwarded to you by the way of references listed above.
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-r, Bechtel Power Corporation Mr. Karl Seyfrit Alvin W. Vogtle Nuclear Plant Bechtel Job 9510-001 Potential Substantial Safety Hazard /Significant Deficiency Report File X7BG03 July 7, 1980 We trust that this final report will prove sati$ factory.
Very truly yours, BECHTEL
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CORPORATION uf L
B. L. Lex Project Manager Los Angeles Power Division MRT/ar.:
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D. I. Outton C.
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Hayes J. A.
Bailey V.
5:ello IEE - Warh.
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4 FINAL REPORT ON POTENTIAL SUBSTANTIAL SAFETY HAZARD /SIGNIFICANT DEFICIENCY REGARDING PIPE SUPPORT DESIGNS AND EMBED PLATE LOAD CAPACITY
' TABLES ALVIN W. VOGTLE NUCLEAR PLANT UNITS 1 AND 2 REPORTING DATE:
JULY 7, 1980 1.0 Introduction This final report is submitted pursuant to 10CFR21 and describes actions undertaken to correct a potential substantial safety hazard /significant deficiency, associated with pipe support designs delivered to Georgia Power Company by Bechtel Power Corporation for Alvin W. Vogtle Nuclear Plant, Units 1 and 2, Docket Numbers 50-424 and 50-425.
2.0 Indi-idual Repertin:
Burt:n L. Lex, Proje:: Manager - Vogtle, Los Angeles Power Divisi:n, Bechtel Power Corporation,12400 East Imperial Highway. Norwalk, Calif.
90550, delegated by Mr.
I. R. Caraco, Vivr-President and Division Manager of Los Angeles Power Divisi:n, Bechtel Pcwer Corporati0n.
3.0 Facilite Vcgtle lectric Gener2 ting Plant, Unit 1 and 2 (Georgia Pcwer Comgany), Burke Ccunty, Georgia.
4.0 Supplyin
Firms De sign:
Bechtel Power Corporation.
Construction:
Georgia Power Company.
5.0 Basic Comoonent Identification All pipe supports issued for construction on the Vogtle Project as of January 18, 1980.
This includes 5763 ASME Section III and ANSI B.31.1 (Seismic Category I, upgraded l
non-Seismic Category I and non-Seismic Category I ) pipe supports.
6.0 Deficiency Description The load capacity tables for embed plates were determined on the basis of full engagement area and no lateral loads (on the weak axis of the embed).
Application of these tables in the design of supports, in some cases, has been based on partial engagement and has allowed lateral loads in some instances.
It was considered possible that some pipe support designs released for construction might have exceeded the allowable embed loads based on partial engagement and the presence of the lateral i
loads.
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7< 0 Date of Notificntion of Defect Bechtel Power Corporation identified the condition on January 25, 1980.
Bechtel's preliminary evaluation on January 28, 1980 was reported to the Georgia Power Company which in turn reported the condition under 10 CFR 50.55(e) to I&E, Region II on that date.
Bechtel continued their evaluation on January 29, 1980 and reported to I&E, Region IV on the same date that the condition may be reportable under 10 CFR 21.
8.0 Status before Corrective Actions A' total No pipe supports had been installed on Units 1 and 2.
of 5763 nuclear and non-nuclear class pipe support designs had been issued for construction.
9.0 Correceive Actions 9.1 Pipe support design issue for construction was suspended until new capacity tables for embed plates were prepared, apprcved and issued.
pipe support installation was suspended pending resolution 9.2 of design adequacy of each individual support.
9.3 Georgia Pcwer Ocmpany was notified.
A Prchlem Alert was issued to all Bechtel projects requiring 9.4 revis-cf their pipe suppcrt design for correct interpretation and implementation Of the design guide.
Twenty-Six Bechtel were alerted and responses naclear projects, present and past, Al'. projects which had used the design guide reported received.interpretation and inplementation.
All projects which correct had noc dsed tha design guide reported that their design methods had properly handled the pipe support / embed interface using basic structural design methods.
Two projects have not yet cc=menced pipe support design, but are now alerted to this incident.
I 9.5 New load capacity tables were produced for all existing types l
l of embeds considering the following:
Embed loadings with three mutually perpendicular forces and o
I moments No embed stiffening requirement o
Embed flexibility for out-of-plane bending, except for the o
localized stiffening owing to the supporting steel Supporting steel orientation o
Supporting steel size o
Embed rigidity in its own plane 1
o Permissible embed loading area o
Minimum edge to edge distance for multiple supporting o
steels attached to the same embed Several training sessions were held with Engineers and l
Designers within Pipe Stress and Supports Group.
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9.6 All 5763 pipe aupport drawings were subjected to review using the new Capacity Tables.
In Summary:
Total Voided No redesign Redesigned o
Supports issued for construction on February 1, 1980 5763 o
Supports voided for various non-embed related reasons 763 o
Support needing no review; supporting steel attached :
rac::s or existing C/S steel 2162 o
Supper:s needing no redesign upon review 1532 o
Supports redesigned upcn reciew 1306 o
Totals 5763 =
763 +
3694
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1306 Pipe support drawines redesigned because of the 10 CFR 21 review represent 211 i= 100x1306/5763) of all supports issued for const.ruction en February 1, 1920.
10.0 Installation hold lift Georgia Power Ccmpany's Construction was notified on July 8, 1980 to lift the installation hold on all supports listed as acceptable in the Embed Summary Sheets, which were i
I specially prepared for this review effort.
1 11.0 Redesigned Supports The extent of redesign performed during this effort falls into one or more of the following categories:
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Increased cross-section of the supporting steel o
Addition of a back-up plate between the supporting steel and embed o
Support steel bracing.
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12.0 Safety Implications Bechtel Power Corporation designs pipe supports in only Seismic Category I buildings, in which all supports are designed either as Seismic Category I and as upgraded non-Seismic Category I supports, or as non-Seismic Category I supports.
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According to Regulatory Guide 1.29, only Seismic Category I and upgraded non-Seismic Category I supports are safety related basic components.
The redesigned Seismic Category I and upgraded non-Seismic Category I supports have been originally issued for construction and have exceeded the allowable embed 1cais c various degrees in design.
It is possible that the existing design margins may not have been sufficient to preclude inelastic deformations and prevent failure of few pipe supports under design loads.
13.0 Conclusion The inclusion Of Seismic Category I and upgraded non-Seismic Catescry I supports in the subject finding qualifies the e::istin
=cndition as a reportable deficiency under 10 CFR 21.
The be:P.-up naterial for this final report is available for inspe::icn at Bech:el's facility in Building No. 46, 11445 Scu n Lakewcod Boulevard, Downey, California 90241.
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