ML19310A149

Interim Followup to 800131 Rept Re Possible Pipe Support Design Deficiency.Pipe Support Review Will Take Longer than Three Months.Completion Expected by June 1980.Current Status of Corrective Actions Includes Review of 5,760 Supports

ML19310A149
Person / Time
Site:	Vogtle
Issue date:	05/02/1980
From:	Lex B BECHTEL GROUP, INC.
To:
Shared Package
ML19310A143	List: ML19310A149 ML19310A159
References
NUDOCS 8006060170
Download: ML19310A149 (3)

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Bechtel Power Corporation Engineers - Constrt ctors 12400 East Irnpenal Highway Norwalk. Cahfornia 90650 MAIL ADORESS P O BOX 60860 - TEAMiNAL ANNEX, LOS ANGELES CALIFORNIA 90060 TELEPHONE (213) 8644011 May 2, 1980 Mr. Karl Seyfrit Director, Region IV Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suit 1000 Arlington, Texas 76012

Subject:

Georgia Power Company Alvin W. Vogtle Nuclear Plant Bechtel Job 9510-001 Potential Substantial Safety Hazard /Significant Deficiency Report File X7BG03 no nnn4

Dear Mr. Seyfrit:

This report is an interim follow-up to our January 31, 1980 report .

to you under 10 CFR 21 requirements concerning a possible deficiency in pipe support design.

Our January 31, 1980 report anticipated completion of the entire l corrective action program in approximately 3 months. Although major portions of the corrective action program have been completed, some pipe support designs remain to be reviewed. We now anticipate l completion of review by June 1980, and filing of a final report to i you by mid-July 1980. The following is the status of the Corrective l Action program described under Section 7 of our January 31, 1980 report.

l A. Actions by the Project

1. No pipe supports have been installed on Unit 1 or Unit 2.

Work will be allowed to commence as pipe support designs are reviewed, revised as necessary, and issued for con-ntruction as described under paragraph 3 following.

2. New embed plate load capacity tables have been prepared and issued.

The new Load Tables include:

a. The effects of partial engagement and lateral loads.

8006000 lif C)

Bechtel Power Corporation Mr. Karl Scyfrit Alvin W. Vogtle Nuclear Plant May 2, 1980 Bechtel Job 9510-001

, Potential Substantial Safety Hazard /Significant Deficiency Report File X7BG03 Page 2

b. Appropriate stiffening details at the embed plate and pipe support interface to assure full engagement where required.

c. Expanded scope to consider various loading conditions encountered in the design of the supports.

d. Revised criteria for attaching members parallel to the plane of the insert plate. The target area for attaching members perpendicular to the plane of insert plate has been extended to cover areas up to one inch from the edge of the embed plate.

3. The Phase I review of approximately 5,760 issued supports has been completed. Phase I review was to identify supports which require reanalysis and/or design modification, as a result of partial engagement or due to additional lateral loads, and supports that do not require further analysis or modification. 2,824 supports were found acceptable, requiring no analysis or modifications. These

. are being released for construction.

]

i Phase II review, including the reanalysis and any actions to carry out necessary design modifications utilizing the new Load Carrying Capacity Tables referenced above, is in progress. The current status of the detail review is as follows:

a. Approximately 1,105 supports have been revised and are being reissued for construction. Of these supports:

o 63% required reanalysis only, but no modification to the design; o 37% required reanalysis and redesign.

b. The remaining 1,834 supports currently undergoing reviev will be issued after they have been reanalyzed and/or revised to meet the design requirements.

c. This work is expected to be completed by June 1980.

4. Training sessions have been held between the Pipe Stress and Support Group and the Civil / Structural Design Group on proper use of the embed load capacity tables and correct interfacing of pipe supports to embed plates.

Bechtel Power Corporation Mr. Karl Seyfrit Alvin W. Vogtle Nuclear Plant Bechtel Job 9510-001 May 2, 1980 Potential Substantial Safety Hazard /Significant Deficiency Report File X7BG03 Page 3 B. Actions by Divisional Management

1. The applicable design guide has been reviewed and found to be correct. No further action is required.

2. A Problem Alert was issued to all Bechtel projects requiring review of their pipe support design for correct interpretation and implementation of the design guide.

Twenty-Six Bechtel nuclear projects, present and past, were alerted and responses received. All projects which had used the design guide reported correct interpretation and implementation. All projects which had not used the 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 commenced pipe support design, but are now alerted to this incident. No further action is required.

We trust that this interim report will prove satisfactory. You may expect our final report in July.

Very truly yours, BECHTEL POWER CORPORATION B.' L. Lex Project Manager Los Angeles Power Division BLL/amt xc: D. E. Dutton C. W. Hayes J. A. Bailey V. Stello I&E - Wash. D.C.

Bechtel Power Corporation l Engineers - Constructors 12400 East Imperial Highway Norwalk. California 90650 u n Aconess P O Box 60860 TEAutNAL ANNEX LOS ANGELES CAUFORNIA 90060 TELEPHM Q13)e644011 l

January 31, 1980  !

l Mr. Karl Seyfrit Director, Region IV Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

Subject:

Georgia Power Company Alvin W. Vogtle Nuclear Plant Bechtel Job 9510-001 Potential Substantial Safety ,

l Hazard /Significant Deficiency Report File X7BG03 Log BO 0003

Dear Mr. Seyfrit:

l This is an interim report covering requirements under 10 CFR 21 and 10 CFR 50.55 (e) regarding the potential deficiency reported to you by telephone at approximatqly 8:50 A.M. Pacific Standard Time on January 29, 1980 by Bechtel personnel, Burton L. Lex, Project Manager Vogtle. This same condition was reported on January 28, 1980 to Inspection and Enforcement, Region II (Atlanta) by telephone by l l

Georgia Power Company as a significant reportable deficiency per  !

10 CFR 50.55 (e) as reported to you on January 29, 1980. Bechtel has concluded that this condition may be reportable under 10 CFR 21.

This report is intended to describe the condition, our investigation and conclusions reached to-date, and our corrective action program to complete the evaluation and to r ' ' '

tive material required under bot are included.

DUPLICATE DOCUMENT The following is the specific in Entire document previously

1. INDIVIDUAL REPORTING entered into system under:

Burton L. Lex, Project Mana Bechtel Power Corporation, ANO 800Ro105 % ,

90650 No. of pages: i 98970Mb Qy _