ML17298B233
| ML17298B233 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/05/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-CR-3663 ANPP-30440-MFH, GL-84-04, GL-84-4, NUDOCS 8409100170 | |
| Download: ML17298B233 (5) | |
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ACCESSION NBR:840 FACIL:STN 50 528 STN",50 529 STN"50 530 AUTH,NAME VAN BRUNTrE,E REC IP, NAME KNIGHTON g G 0 9 1 00 1 70 DOC ~ DATE 84/09/05 NOTARIZED NO Palo Ver de Nucl ear Stations Unit ir Arizona Pub l,i Palo Verde Nuclear Stations Unit 2~ Arizona Publi Palo Verde Nuclear Station~
Unit 3E Arizona Publi AUTHOR AFFILIATION Arizona Public Service Co.
RECIPIENT AFFILIATION Licensing Branch 3
DOCKET 05000528 05000529 05000530 SUBJECTS Provides addi Justification for 840607 request for partial exemption from GDC Imper NUREG/CR-3663.Probabilities of
'ndirect induced double ended guillotine break smaller than calculated for plants for which exemptions granted.
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Arizona Public Service Company P.O. SOX ZI666
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PHOENIX. ARIZONA 85036 September 5,
1984 ANPP 30440
?'IFH/MAR Director of Nuclear Reactor Regulation Attention:
Mr. George Knighton, Chief Licensing Branch No.
3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2 and 3
Docket Nos.
STN-50-528/529/530 File:
84-056-026; G.1.01.10
Reference:
(A) Letter ANPP-29684-EEVB/WFQ, E. E.
Van Brunt, Jr.
to G. Knighton, Request for Partial Exemption to GDC4, dated June 7,
1984 (B) NUREG/CR-3663, Probability of Pipe Failure in the Reactor Coolant Loops of Combustion Engineering PWR
- Plants, by Lawrence Livermore National Laboratory, January 1984.
(C)
NRC Generic Letter 84-04, Safety Evaluation of Westinghouse Topical Reports Dealing with Elimination of Postulated Pipe Breaks in PWR Primary Main Loops, from D.
G. Eisenhut dated February 1, 1984
Dear Mr. Knighton:
In our Reference (A) letter Arizona Public Service (APS) submitted a
request for partial exemption from General Design Criteria 4(GDC4).
Specifically, APS requested exemption from those portions which require protection of structures,
- systems, and components against certain dynamic (including mechanical and structural loading) effects associated with postulated RCS main loop pipe breaks.
Reference (A) provided justification for this exemption.
As additional
- support, APS cites the results of a
study conducted by Lawrence Livermore National Laboratory (LLNL) to determine if the probability of occurrence of a double-ended guillotine break (DEGB) in the primary coolant piping warrants the current design requirements that safeguard against the effect of DEGB.
The conservatively based results for Palo Verde Units 1,2
& 3 indicate a
best estimate annual probability smaller than 1.5 X 10-8 for pipe leaks and less than 4.53 X 10-13 for direct DEGB caused by crack growth.
o aaoeos pDR ADOCK 0 pgR soo9ioo~
sooo528 A
Mr. Knighton Page 2.
Volume 3
of Reference (B),
prepared by Structural Mechanics Associates for LLNL, on the probability of indirect-induced DEGB due to earthquake, indicates the 90%
confidence value using very conservative assumptions, for an indirect induced DEGB at Palo Verde 1,2 and 3 is 1 X 10 based on the site specific hazard curve.
These probabilities are clearly smaller than those calculated for some plants for which exemptions were granted in Reference (C).
APS requests that this additional justification for this exemption be given prompt consideration in conjunction with the information provided in Reference (A).
If you have any questions, please contact me.
Very truly yours, APS Vice President Nuclear Production ANPP Project Director EEVBJr/MAR/rw cc:
E.
A. Licitra A.
C.
Gehr
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