ML20087N845

Final Deficiency Rept Re Pipe Support Design Calculations. Initially Reported on 831121.Bechtel Analysis Indicated Support Sys Design Adequate & Meets Design Margins.Item Determined Not Reportable Per 10CFR50.55(e) or Part 21

ML20087N845
Person / Time
Site:	Vogtle
Issue date:	03/26/1984
From:	Foster D GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
GN-332, NUDOCS 8404050079
Download: ML20087N845 (4)

Text

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Georgia Power Company

. - Route 2, box 299A

.. ; Waynesboro. Georgia 30830

. Telephone 404 554-9961, Ext. 3360 404 724-8114, Ext. 3360

' Georgia Power ic P es entandProject B4 MAR 2 AIO : 00 Generaf Manager the southem e!wtrc system Vogtle Project March 26, 1984

' United States Nuclear Regulatory Commission File: X7BG03-M39 Office of Inspection and Enforcement Log: GN-332 Region II-Suite 3100 101 Marietta Street Atlanta, Georgia 30303 y

Reference:

Vogtle Electric Generating Plant-Units 1 and 2, 50-424, 50-425; Pipe Support Design Calculations, GN-283, dated 11/21/83 Attention: Mr. James P. O'Reilly Gentlemen:

In our letter GN-283 dated November 21, 1983, Georgia Power Company indicated that the NRC could expect a final report on this subject by March 25, 1984. Georgia Power Company has received the results of the reanalysis of the pipe support design for the Vogtle Project. Bechtel 's analysis has indicated that the support system design is adequate and that it meets its design margins. Georgia Power Company has concluded that this event is not reportable pursuant to the requirements of 10 CFR 50.55(e) and 10.CFR 21. A copy of the evaluation summary report is attached for your information.

-This response contains no proprietary information and may be placed in the NRC Public Document Room upon receipt.

Yours truly j

. O. Foster REF/D0F/tdm xc: U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 xc: R.-J. Kelly D. E. Dutton J. A. Bailey L. T. Gucwa R._E. Conway W. F. Sanders 0. Batum M. Malcom G. F. Head R. H. Pinson G. Bockhold H. H. Gregory C. W. Hayes P. D. Rice B. M. Guthrie .J. T. Beckham D. M. MacLemore R. A. Thomas E. D. Groover J. L. Vota 8404050079 840326 OFFICIAL COPY

. PDR ADOCK 05000424 S PDR ff 2 l

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EVALUATION .FOR A SUBSTANTIAL SAFETY HAZARD EVALUATION FOR A SIGNIFICANT. DEFICIENCY Pipe Hanger Support Calculations

- Initial Report:-

-On March 25,:1983, Mr. C. W. Hayes, Georgia Power Company's Quality Assurance i

- Manager for the .Vogtle Project, reported a. potential deficiency to Mr. Greg

- Neilfelt of the USNRC concerning missing calculations for 12 pipe supports.

Background Information: .

s.

Prior to March 1983, the Bechtel.' Pipe Stress and Support Group (PSSG) followed #

L - a design' procedure for pipe supports which is -defined in the attached flow chart.

~

As part of this procedure, miscellaneous steel design calculations were retained swithin the PSSG unti1~ the related . support design was issued for construction.

The: design drawings and the pipe stress analysis calculations were retained under

~

L the control of the Bechtel Home Office froject Administration (PA). When the pipe: support design was issued for construction all associated calculations and "

L  ; design drawings.were_ transferred to the'Bechtel Project Field Engineering (PFE)

' office.

.In' March 1983, while assembling calculation: packages for transfer to the Bechtel L

PFE Bechtel Home Office Engineering' discovered cases where pipe support miscellan-F~

eous steel design. calculations were not available and the associated pipe' support

! drawings had been issued for construction. ,

'Engineerin' g Evaluation:

. AsJa result of this event, a review was performed of the miscellaneous steel design

' file for all existing pipe. supports. A total of 16,856 pipe supports addressed by l 11,796 miscellaneous steel ~ calculations were reviewed. It was discovered that

miscellaneous steel calculations were either lost or misplaced for 141 ASME

. .Section III-supports and 121 ANSI B31.1 supports.

L New miscellaneous steel calculations 'were performed for the 262 pipe supports

[ ' :for which no calculations were available. These new~ calculations were based

! on the latest-piping stress analysis input and the existing miscellaneous steel

( design shown on the latest pipe support drawing revisions.

I Based on this review and results of the new calculations, it was concluded

-that this condition would have no impact on the safety of plant operation because L the pipe support designs were found to be adequate to meet the latest piping stress. analysis and included adequate: design margins.

p

-s .

Evaluation of Quality Assurance Program:

The Southern Company Services' Quality Assurance 9epartment has reviewed this condition and has concluded that since the :alculations were not maintained and controlled by Bechtel'PA through the Document and Data Control Center (DDC),

'a QA Program breakdown did occur.

However, since the new calculations revealed that the designs in question were adequate, the QA breakdown does not represent a reportable event in the design of Plant Vogtle. *

Conclusion:

The NRC has defined "significant" as having an effect, or likely to have an effect on..or . influence, the safe operation of the facility in an adverse manner. Based on the evaluation provided by Bechtel, there will not be any adverse effect on tne facility, therefore a significant deficiency or substantial safety hazard cannot exist and this event is not reportable.

Corrective Action:

Immediately upon discovery of this condition in March 1983, all miscellaneous steel calculations for pipe supports were placed under the control of Bechtel Home Office PA. All calculations are submitted to PA inmediately upon completion. This new procedure is structured to ensure that no calculations are misplaced or lost and that they are properly transferred to Bechtel PFE as part_of the total analysis and design package when the pipe support drawing is released for construction. The personnel involved have been instructed in the

, requirements of this new procedure.

S

,, - ,. .an- - . , --. ,,-

1 PIPE SUPPORT DESIGN FLOW CHART * .

1 Pipe Support Calculations

_ Stress _ (Misc. Steel) _ Pipe Support . Issue For Construction Drawings

~

Calculations

! Isometrics PSSG retension until transfer to PFE, DDC.

l

! Original n 't U 1

f Home Office Home Office Home Office h u

DDC retention DDC retention DDC retention

until transfer until transfer until transfer 4

to PFE.DDC to PFE, DDC to GPC, DDC i

! 4 1

i y GPC y if U _

PFE _

~

l- '

DDC DDC l

4 j

• Prior to corrective action. After corrective action PSSG no longer retains pipe support calculations.

These are retained by Home Office DDC as is the procedure for other activities. ,

l -