ML20198H285
| ML20198H285 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 12/03/1997 |
| From: | Dick G NRC (Affiliation Not Assigned) |
| To: | Johnson I COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML20198H288 | List: |
| References | |
| GL-88-02, GL-88-2, TAC-M74389, TAC-M74390, NUDOCS 9801130247 | |
| Download: ML20198H285 (4) | |
Text
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Deccaber 3,1997 Ms. Irene M. Johnson, Acting Manager Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West til 1400 Opus Place, Suite 500 Downers Grove,IL 60515
SUBJECT:
INDIVIDUAL Pl. ANT EXAMINATION, BYRON STATION, UNITS 1 AND 2 (TAC NOS. M74389 AND M74390)
Deer Ms. Johnson:
By letter dated April 28,1994, Commonwealth Edison Company submitted the Individual Plant Examination (IPE) for Byron Station, Units 1 and 2, in response to Generic Letter (GL) 88 20, Individual Plant Examinations for Severe Accident Vulnerabilities. A revised submittal was made on March 27,1997.
We, with the assistance of our contractor, Brookhaven Natio.,al Laboratory, have rhewe' botti d
the original and revised submittels and find that the IPE is complete with regard to the o y
information requested by GL 88 20. We therefore conclude that Comed has met th'e Intent oF;,
GL 88-20 for Byron Station.
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Please note that our review primarily focused on Comed's ability to examine Byron,iunits j and.
J 2, for severe accident vulnerabilities. Although certain aspects of the IPE were expforoddg m6f4 detail, the review is not intended to validate the accuracy of Comed's detailed findingh (or,tified u
quantitative estimates) that stemmed from the examination. We did note that Comed ide'n potential vulnerability involving a dual unit loss of essential service water from floodin'. Comed g
Indicated that a modification is being addressed which, when implemented, will reduce the core L
damage frequency (CDF) from about 1E-4/ year to about 1E-6/ year. Please inform us when the modification is complete so that the correct CDF may be attributed to Byron.
The enclosed Safety Examination Report does not constitute NRC approval or endorsement of
. any IPE material for purposes other that those associated with meeting the intent of GL 88 20.
.t Sincerely, ORIGINAL SIGNED BY:
George F. Dick, Jr., Project Manager i
~
Project Directorate ill-2 Division of Reactor Projects lil/IV 7
Off'ce of Nuclear Reactor Regulation' I'
4 Docket Nos. STN 50 454 and STN 50-455
Enclosure:
Staff Evaluation Report cc w/ encl: See next page
- DOCUMENT NAME:G:\\CMNTJR\\ BYRON \\BY74389.lPE To tece6ve a copy of this docenent. Indk.aeo in the bou *C's Copy wahout onciosures *E's copy with enclosures "M" = No copy OFFICE PM:PD34 f LA:PD3 2 D:PD3 2 d.
DJusttunON oechst Pu8uc PDill-2t/f GDek NAME G DICK WJ CMOORE 4.4 RCAPRA /I4 r DATE 14 N97' 11/4/97
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December 3,.1997-Ms. Irene M. Johnson, Acting f Aanager Nuclear Regula6ery Servioos
. Commonwealth Editnon Company
- Emooutive Towers West lli 1400 Opus Place, Sulle 500 Downers Grove,IL 90515
SUBJECT:
INDIVIDUAL PLANT EXAMINATION, BYRON STATION, UNITS 1 AND 2 -
_ (TAC NOS. M74389 AND M74390)
Dear Ms. Johnson:
e By letter dated April 28,1994, Commonwealth Edison Company submitted the individual Plant Examination (IPE) for Byron Station, Units 1 and 2, in response to Generic Letter (GL) 88 20, 3
lodividual Plerd Examinations for severs Acciderd Vulnerst# ties. A revised submittal was made J
on March 27,1997.
We, with the assistance of our contractor, Brookhaven National Laboratory, have reviewed both
. the original and revised submittels and find that the IPE is complete with regard to the _ _
information requested by GL 88 20. We therefore conclude that Comed has met the intent of l
GL 88 20 for Byron Station.
l Please note that our review primarily focused on Comets ability to examine Byron, Units 1 and
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2, for severe sociderd vulnerabilities. Although certain aspects of the IPE were explored in more j
detail, the review is not intended to validate the accuracy of ComEss detailed findings (or i
quantitative estimates) that stemmed from the examination. We did note that Comed identined a i
potential vulnerability involving a dual unit loss of essential service water from flooding. Comed i
ndicated that a modification is being addressed which, when implemented, will reduce the core i
damage frequency (CDF) from about 1E 4/ year to about 1E4/yser. Please inform us when the modification is complete so that the correct CDF may be attributed to Byron.
The enclosed Safety Examination Report does not constitute NRC approval or endorsement of f
any IPE matertal for purposes other that those associated with meeting the intent of GL 88 20.
y Sincerely,
[
ORIGIllAL SIGNED BY:
George F. Dick, Jr., Project Manager
~ Project Directorate 1112 1
Division of Reactor Projects lil/IV i
Office of Nuclear Reactor Regulation Docket Nos. STN 50 454 and STN 50455 Enciosure: Staff Evaluation Report oc w/oncl: See next page
- DOCUMENT NAME:G:CMNTJRWYRONWY74389 lPE To sessen e esas er eine ensement timeone in en bes: ac = cow maneut ensiesem v = c49 man eneseewee v = th een OFFICE PM:PD3d I 9 LA:PD3-2 D:PD3 6 D18TamuTiow oseens ruouc Posis-2rn ooisk DATE 14N97' 11/$97 1F/97
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NAME O DICK )%
CMOORE O RCAPRA / de [,(
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OFFICIAL RECORD COPY
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION j-i wAsumetow, o.c. snee64ees v
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. December 3, 1997 Ms. trene M. Johnson, Acting Manager l
Nuclear Requestory Servloos 1
Commonwoollh Edison Company Eaeoutive Towers West til 1400 Opus Pleos Sulle 500 l
Downers Grove,IL 60515 J
SUSJECT: INDIVIDUAL PLANT EXAMINATION, BYRON STATION, UNITS 1 AND 2 i
- (TAC N08. M74309 AND M74390) l
Dear Ms. Johnson:
By letter dated April 28,1994, Commonwealth Edison Company sutwnitted the individual Plant Examination (IPE) for Byron Station, Units 1 and 2, in response to Generic Letter (GL) 88 20, j
individual Plant Examinations for severs Accident Vulneret46 ties. A revised submittal was made on March 27,1997, l
- We, with the assistance of our contractor, Brookhaven National Laboratory, have reviewed both the original and revised submittels and find that_the IPE is conplete with regard to the information requested by GL 88 20. We therefore conclude that Comed has met the intent of i
OL 48 20 for Byron Station.
Please note that our review primarily focused on ComEss ability to examine Byron, Units 1 and 2, for severe socident vulnerabil6 ties. Although certain aspects of the IPE were explored in more detail, the review is not intended tu validate the soeuracy of ComE#s detalled findings (or i
quantitative estimates) that stemmed from the examination. We did note that Comed identifed a 1
potential vulnerabWty involving a dual unit loss of essential service water from flooding.- Comed indicated that a modifloation is being addressed which, when implemented, will reduce the core damage frequency (CDF) from about 1E-4/ year to about 1E 6/ year. Please inform us when the mod 6floation is complete so that the correct CDF may be attributed to Byron.
1 The enclosed Safety Examination Report does not constitute NRC approval or endorsement of any IPE material for purposes other that those associated with meeting the intent of GL 88 20.
i 8
- rey, Mk et Dick, Jr., Project Manager Project Directorate 1112 i
Division of Reactor Projeds lil/lV l
Offlon of Nucioar Reactor Reguistion j
Docket Nos. STN 50 454 and STN 50455
Enclosure:
-Staff Evaluation Repoti
- oc wfenoi
- See next page
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- 1. Johnson Byron Station Commonweallh Edloon Company Unit Nos.1 and 2 '
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Michael 1. MWor, Esapsire
- Ms. Larraine Crook l
Sidley and Austin Rt.1. Box 182 one First Nelional Plaza Manteno,luinois 40050 Chioppo, Illinois 90003 Chairman, Ogle Courdy Board i
Regional Adr,Snistrator, Regim lli Post Offlos Box 357 l
. U.S. Nuclear R Commission Oropon, Illinois 61081 s01 Wanonvale Lleie, Illinois 00632 4351 Mrs. Phleip B. Johnson l
1907 Stratford Lane lilinois Department of _
Rockford, Illinois 81107 r
Nuclear Sawy Offloe of Nucisar Foollity Safety Attomey General 1035 Outer Park Drive 800 South Second Stre M '
Spring 6 eld,luinois 62704 Spring 6esd, Illinois 62701-Document Control Desk Licensing Els ReviewCoordinator commonwealth Edison Company U.S. Environmental Protection Agency t
1400 Opus Place, Suite 400 77 W. Jackson Blvd.
Downers Grove,lanois 00515 Chicago, Illinois 60604 3590 Mr. William P. Poirier, Director Comem,nwealth Edison Company 1
Westinghouse Electric Corporation Byron Station Manager Energy Systems Business Unit (450 North German Church Road l
Post Offlos Box 355, Bay 236 West Byron, Illinois 61010 -
Pittsburgh, Pennsylvania 15230 Kenneth Groesser, Site Vice President Joseph Gallo Byron Station Gallo & Ross Commonwealth Edison Station 1250 Eye St., N.W.
4450 N. German Church Road l
Suite 302 :
Byron, Illinois 61010 Washington, DC 20005 How ard A. Leamer Environmentallaw and Policy Center of the Midwest 203 North LaSalle Street Suite 1390 _
Chicago, Illinois 60001-U.S. Nuclear Regulatory Commissien Byron Resident inspectors Omoe 4448 North German Church Road Byron, Illinois 61010-9750-l
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