ML20235X017
| ML20235X017 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 07/15/1987 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML19292H540 | List: |
| References | |
| GN-1383, NUDOCS 8707240011 | |
| Download: ML20235X017 (3) | |
Text
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'. Georgi 2 Power Company Fbst Office Box 282 J Waynesborn Georgia 30830 1
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Telephons 404 s54-9961
.I 404 724 8114 I
Southern Company Services, Inc h
- Post Office Box 2625 Birmingham, Alabama 35202 Telephone 205 870-6011 V@tle Proj.ect
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' Julv 15.1987 U. S. Nuclear Regulatory Commission Document Control Desk File:
X7BC35 Washington, D. C.
20555 Log:
GN-1383 l
References:
- 1) GPC Letter to NRC, April 29, 1987
- 2) Vogtle FSAR Section 5.2.5
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- 3) Analysis of Experiments on Stainless Steel Flux Welds, NUREG/CR-4878, BMI-2151, April 1987 NRC DOCKET NUMBER 50-425 CONSTRUCTION PERMIT NUMBER CPPR-109 l
V0GTLE ELECTRIC GENERATING PLANT - UNIT 2 AUXILIARY LINE PIPE BREAK ELIMINATION PROGRAM._
Gentlemen:
t l
By letter dated April 29, 1987, (Reference 1), GPC informed the i
,f NRC of its intention to seek a partial exemption from the requirements of General Design Criterion 4 of Appendix A to 10CFR50 for Vogtle Unit 2.
The technical basis for the elimination of I
postulated ruptures is based on the leak-before-break (LBB) approach.
The LBB approach is to be applied to the pressurizer surge line, the accumulator injection and the residual heat removal 1
(RHR) suction lines.
The elimination of hardware -(pipe whip restraints and jet impingement shields) used to mitigate the dynamic effects of pipe rupture would not affect the environmental impact of the facility.
As a first milestone of the LBB program, a detailed fracture mechanics analysis of the pressurizer surge line was completed.
Results of the evaluation were discussed with the NRC staff in the meeting of June 4,1987.
Based on this meeting and subsequent conversations with the staff, a report entitled " Technical Bases for Eliminating Pressurizer Surge Line Rupture as the Structural Design Basis for Vogtle Unit 2"
has been completed.
GPC is-enclosing five (5) copies of this proprietary report WCAP-11531 as Attachment I to this letter. contains five (5) copies of a non-proprietary version (WCAP-11532).
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. Auxiliary Line Pipe Break Elimination Program File:.X7BC35 Log: GN-1383 July 15, 1987 Page two As discussed with the staff, the leak-before-break evaluation presented in these reports shows that the flaw size used in the stability analysis produces a leakage rate of ten times the minimum detectable. leak rate for Vogtle and is in accordance with the guidelines established by NUREG 1061, Volume 3.
The leak detection system for. Vogtle is described in Reference 2.
' For fra.cture mechanics evaluation, the Jmax values of up to 10,000 in-lb/in2 were considered applicable by using large speciraen submerged arc weld toughness data of reference 3 as discussed with the staff.
The maximum calculated Japplied. are -under 5400 in-lb/in2.
Based on the fracture mechanics evaluation resul ts, presented in WCAP-11531, it is concluded that pressurizer surge line breaks need not be considered in the structural' design basis of Vogtle Unit 2.
WCAP-11531 contains information proprietary to Westinghouse-Electric Corporation which is supported by an affidavit signed by Westinghouse, the owner of the information.
The affidavit sets forth the basis on which the information may be withheid from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b) (4) of Section 2.790-of the Commission's regulations.
Accordingly, it is respectfully requested that the information which is proprietary to Westinghouse be withheld from public disclosure in accordance with 10CFR Section-2.790 of the Commission's regulations.
Correspondence with respect to the proprietary aspects of the Application for withholding or the supporting Westinghouse Affidavit i
should reference CAW-87-067 and should be addressed to R.
A.
Wiesemann, Manager of Regulatory and Legislative
- Affairs, Westinghouse Electric Corporation, P.
O.
Box 355, Pittsburgh, Pennsylvania 15230-0355.
We are looking forward to your prompt review and approval of these submittals.
Should you have any questions on this matter, please inquire.
1 Sincerely,
~
. G. J J. A. Bailey Project Licensing Manager JAB /wkl Attachment xc:
See Next Page
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J Auxiliary Line Pipe Break Elimination Program File:- X7BC35 Log:
GN-1383 July 15,1987 Page three xc: NRC Regional Administrator NRC Resident Inspector J. P. O'Reilly R. E. Conway L. T. Gucwa R. A. Thomas J. E. Joiner, Esquire M. A. Miller (?)
G. Bockhold, Jr.
R. Goddard, Esquire D. Feig R. W. McManus Vogtle Project File I
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