ML20129F877
| ML20129F877 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood  |
| Issue date: | 10/25/1996 |
| From: | Assa R NRC (Affiliation Not Assigned) |
| To: | COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML20129F884 | List: |
| References | |
| TAC-M95342, TAC-M95343, TAC-M95344, TAC-M95345, NUDOCS 9610290229 | |
| Download: ML20129F877 (4) | |
Text
_
4 October 25, 1996 Ms. Irene Johnstn, Acting Manager Nuclear R:gulatory Services-4 Commonwealth Edison Company Executive Towers West III 1400 Opus Place, Suite 500 Downers Grove, IL 60515 i
SUBJECT:
SAFETY EVALUATION (SE) REGARDING LEAK-BEFORE-BREAK ANALYSIS -
BYRON STATION, UNITS 1 AND 2, AND BRAIDWOOD STATION, UNITS 1 AND 2 j
(TAC NOS. M95342, M95343, M95344 AND M95345)
}
Dear Ms. Johnson:
l By letter dated April 30, 1996, Commonwealth Edison Company (Comed, the licensee) submitted a request to apply leak-before-break (LBB) analyses to eliminate large primary loop pipe rupture from the structural design basis for Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2.
The request was. based on the LBB analysis of the primary loop piping as permitted by General i
Design Criteria 4 (GDC-4) of.10 CFR Part 50, Appendix A.
Comed provided i
additional information by letter dated September 25, 1996, in response to the j
staff's request for additional information dated August 26, 1996.
1 The staff has completed its evaluation of the information presented in the aforementioned documents.
The staff has concluded from its independent analysis that the probability of large pipe breaks occurring in the primary loop piping j
of these units is extremely low. Thus, per GDC-4, the dynamic effects of such breaks need not be considered in their structural design basis. The enclosed SE provides the technical basis for the staff's finding.
i j
Sincerely, i
Original signed by:
Ramin R. Assa, Project Manager Project Directorate III-2 i
Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation i
l Docket Nos. STN 50-454, STN 50-455, i
STN 50-456, STN 50-457
-s Y
l
Enclosure:
SE j
cc w/ encl:
see next page Distribution:
! Docket File:
PUBLIC PDIII-2 r/f (2)
J. Roe, JWR E. Adensam, EGA1 R. Capra C. Moore (2)
R. Assa l
G. Dick OGC, 015818 ACRS, T2E26 R. Lanksbury, RIII 4
DOCUMENT NAME:
BB95342.LTR
- concurrence provided by memo dtd 10/15/96; no major changes Ta receive a espy of thee desusnent, Indoete in the bom *C' = Copy without enclosuree "E" = Copy with enclosuree *N* = No copy 0FFICE PM:PDIII.52 PM:PDIIA-lhl 6 (LA M III-2 lU (A)C:EMCB l D:PDIII-2 l E NAME RASSA W GDICK %4J Q40$h
- BELLIOTT RCAPRA m -
e
)
DATE 10/#/96 10/fJ/96 107))/96 10/ /96 10/a5 /96
~'
0FFICIAL RECORD COPY 1
l 9610290229 96102r" NBC Hl.E ENTER CDPY PDR ADOCK 05000454 P
_ ~ ~. _
C'0 i,
0 g*
UNITED STATES g
. g NUCLEAR REGULATORY COMMISSION t
WASHINGTON, D.C. 2056M001 October 25, 1996 Ms. Irene Johnson, Acting Manager Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West III 1400 Opus Place, Suite 500 i
Downers Grove, IL 60515 1
l
SUBJECT:
SAFETY EVALUATION (SE) REGARDING LEAK-BEFORE-BREAK ANALYSIS -
BYRON STATION, UNITS 1 AND 2, AND BRAIDWOOO STATION, UNITS 1 AND 2 j
(TAC NOS. M95342, M95343, M95344 AND M95345)
Dear Ms. Johnson:
By letter dated April 30, 1996, Commonwealth Edison Company (Comed, the licensee) submitted a request to apply leak-before-break (LBB) analyses to eliminate large primary loop pipe rupture from the structural design basis for Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2.
The request was based on the LBB analysis of the primary loop piping as permitted by General Design Criteria 4 (GDC-4) of 10 CFR Part 50, Appendix A.
Comed provided additional information by letter dated September 25, 1996, in response to the staff's request for additional information dated August 26, 1996.
The staff has completed its evaluation of the information presented in the aforementioned documents. The staff has concluded from its independent analysis that the probability of large pipe breaks occurring in the primary loop piping of these units is extremely low. Thus, per GDC-4, the dynamic effects of such breaks need not be considered in their structural design basis. The enclosed SE provides the technical basis for the staff's finding.
Sincerely, Ramin R. Assa, Project Manager Project Directorate III-2 Division of Reactor Projects - III/IV 1
Office of Nuclear Reactor Regulation Docket Nos. STN 50-454, STN 50-455, STN 50-456, STN 50-457
Enclosure:
SE cc w/ enc 1:
see next page
j' I. Johnson Byron /Braidwood Power Stations Commonwealth Edison Company cc:
Mr. William P. Poirier, Director George L. Edgar Westinghouse Electric Corporation Morgan, Lewis and Bochius Energy Systems Business Unit 1800 M Street, N.W.
Post Office Box 355, Bay 236 West Washington, DC 20036 Pittsburgh, Pennsylvania 15230 Attorney General Joseph Gallo 500 South Second Street Gallo & Ross Springfield, Illinois 62701 1250 Eye St., N.W.
Suite 302 EIS Review Coordinator Washington, DC 20005 U.S. Environmental Protection Agency 77 W. Jackson Blvd.
Michael I. Miller, Esquire Chicago, Illinois 60604-3590 Sidley and Austin One First National Plaza Illinois Department of Chicago, Illinois 60603 Nuclear Safety Office of Nuclear Facility Safety Howard A. Learner 1035 Outer Park Drive Environmental law and Policy Springfield, Illinois 62704 Center of the Midwest 203 North LaSalle Street Commonwealth Edison Company Suite 1390 Byron Station Manager Chicago, Illinois 60601 4450 North German Church Road Byron, Illinois 61010 U.S. Nuclear Regulatory Commission Byron Resident Inspectors Office Kenneth Graesser, Site Vice President 4448 North German Church Road Byron Station Byron, Illinois 61010-9750 Commonwealth Edison Station 4450 N. German Church Road Regional Administrator, Region III Byron, Illinois 61010 U.S. Nuclear Regulatory Commission 801 Warrenville Road U.S. Nuclear Regulatory Commission Lisle, Illinois 60532-4351 Braidwood Resident Inspectors Office i
Rural Route #1, Box 79 Ms. Lorraine Creek Braceville, Illinois 60407 Rt. 1, Box 182 Manteno, Illinois 60950 Mr. Ron Stephens Illinois Emergency Services Chairman, Ogle County Board and Disaster Agency Post Office Box 357 110 East Adams Street Oregon, Illinois 61061 Springfield, Illinois 62706 Mrs. Phillip B. Johnson Chairman 1907 Stratford Lane Will County Board of Supervisors Rockford, Illinois 61107 Will County Board Courthouse Joliet, Illinois 60434
Commonwealth Edison Company i
Braidwood Station Manager Rt. 1 Box 84 Braceville, Illinois 60407 i
Ms. Bridget Little Rorem 1
Appleseed Coordinator j
117 North Linden Street i
Essex, Illinois 60935-Document Control Desk-Licensing Commonwealth Edison Company 1400 Opus Place, Suite 400 1
Downers Grove, Illinois 60515 1
Mr. H. G. Stanley Site Vice President Braidwood Station Commonwealth Edison Company RR 1, Box 84 Braceville, IL 60407 i
i 1
a 4
l i
1