ML20198R297

Forwards Staff Evaluation Rept Re Licensee 940630 Submittal of IPE for Plant,Units 1 & 2,in Response to GL 88-20, IPE for Severe Accident Vulnerabilities. Revised Submittal Was Made on 970327

ML20198R297
Person / Time
Site:	Braidwood
Issue date:	10/27/1997
From:	Dick G NRC (Affiliation Not Assigned)
To:	Johnson I COMMONWEALTH EDISON CO.
Shared Package
ML20198R299	List: ML20198R297 ML20198R306
References
GL-88-20, TAC-M74382, TAC-M74383, NUDOCS 9711130228
Download: ML20198R297 (4)

Text

- . . . - - -

1, f)(

Oct cher 27, 1997 ,

I Ms. Irene Johnson, Acting Manager Nuclear Rsgulatory Services  :

Commonwealth Edis.,n Cempany Executive Tower 2 V est til ,

1400 Opus Place, S*Jite 500 .

Downers Grove,IL 60515  ;

SUBJECT:

INDIVIDUAL PLANT EXAMINATION, BRAIDWOOD UNITS 1 AND 2 (TAC NOS. M74382 AND M74383)

Dear Ms. Johnson:

3 w r .

By letter dated June 30,1994, Commonwealth Edison Company (Comed) submitteB~theR i .

L:llvidual Plant Examination (IPE) for Braidwood Station, Units 1 and 2, in responsflo Generio, ,

Letter (GL) 88-20, " Individual Plant Examination for Severe Accident VulnerabilitiesG A Mvise'd; submittal was made on March 27,1997. :r 3 Q .*2 '.

The NRC, with the assistance of our contractor, Brookhaven National Laboratory, fis royledah both the original and revised subm!ttals, and find that the IPE is complete with reg (td toL4he "

information requested by GL 88-20. We, therefore, conclude that Comed has met 1he iMent of GL 88 20 for Braldwood Station.

Please note that our review primarily focused on Comed's ability to examine Braldwood, Units 1 <

and 2, for severe accident vulnerabilities. Although certain aspects of the IPE were explored in more detall, the review is not intended to validate the accuracy of Comed's detailed findings (or quantitative estimates) that stemmed from the examination. We did note that Comed identified a potential vulnerability involving a dual unit loss of essential service water from flooding. A proposed modification was being considered, which when implemented, would reduce the core damage frequency (CDF) from about 4E 5/ year to about BE 6/ year, if it is decided to implement the modification, please inform us so that, in the future, the correct CDF may be attributed to Braidwood. The enclosed Staff Evaluation Report does not constitute NRC approval or endorsement of any IPE material for purposes other than those associated with meeting the intent of GL 88 20.

Sincerely, f thr.henior Project Manager

.Ne eh.

Project Directorate lil 2 r Division of Reactor Projects Ill/IV  %~ j Office of Nuclear Reactor Regulation l

Docliet Nos. STN 50-458, STN 50 457

Enclosure:

As stated ~ ((

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s October 27, 1997

, Ms. Irene Johnson, Acting Manager Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West til 1400 Opus Place, Suite 500 Downers Grove,IL 60515

SUBJECT:

INDIVIDUAL PLANT EXAMINATION, BRAIDWOOD UNITS 1 AND 2 (TAC NOS. M74382 AND M74383)

Dear Ms. Johnson:

By letter dated June 30,1994, Commonwealth Edison Company (Comed) submitted the Individual Plant Examination (IPE) for Braidwood Station, Units 1 and 2, in response to Generic Letter (GL) 88 20, ' Individual Plac,. Examination for Severe Accident Vulnerabilities.* A revised submittal was made on March 27,1997.

The NRC, with the assistance of our contractor, Brookhaven National Laboratory, has reviewed both the original and revised submittals, 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 GL 88-20 for Braldwood Station.

Please note that our review primarily focused on Comed's ability to examine Braldwood, Units 1 and 2, for severe accident vulnerabilities. Although certain aspects of the IPE were explored in more detail, the review is not intended to validate the accuracy of Comed's detailed findings (or quantitative estimates) that stemmed from the examination. We did note that Comed identified a potential vulnerability involving a dual unit loss of essential service water frem flooding. A proposed modification was being considered, which when implemented, would reduce the core damage frequency (CDF) from about 4E-5/ year to about 6E-6/ year, if it is decided to implement the modification, please inform us so that, in the future, the correct CDF may be attributed to Braidwood. The enclosed Staff Evaluation Report does not constitute NRC approval or endorsement of any IPE material for purposes other than those associated with meeting the intent of GL 88-20.

~

he eh. Si r.henior Project Manager Project Directorate 111-2 Division of Reactor Projects - lil/IV Office of Nuclear Reactor Regulation Docket Nos. STN 50-456, STN 50-457

Enclosure:

As stated cc w/ encl: See next page Dest **n: Docket Fue Pu0uc PDilL2 r/t E. Adensam EGA1 AcRs.T2E26 C. Mccre S. Beery G.Ock E. Rodnck J. Finck OGo.o15B18 R. Capra R. Asse R. Heman R. Lanksbury.R!ll DOCUMENT NAME:GtMNTJR$ RAID 2R74382.LTR To twelve e copy of this doeurnent< indicate in tta bar: *c = rawomo e enclosures *E' = Copy with enebsures *N* = No copy l OFFICE PM PDilL2 Qf l /C LA Phil.2\ l C, O PDitL2 l Ei GDICK /) M CMOORE' ReAPRA SWC-

[lNAME lDATE 10C.'97 10m97 10 (/97 of F5clAL RECORD copy

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g. 4.,

UNITED STATES .

NUCLEAR REGULATORY COMMISSION

, WAsMIWeToN, D.C. SIGAHSM s ,,g j! October 27, 1997 Ms. Irene Johnson, Acting Manager Nuclear Regulatory Services Commonwealth Edison Company Executtve Towers West 111. ,

1400 Opus Place, Suite 500 Downers Grove,IL 60515

SUBJECT:

INDIVIDUAL PLANT EXAMINATION, BRA:DWOOD UNITS 1 AND 2 l (TAC NOS. M74382 AND M74383)  ;

Dear Ms. Johnson:

4 By letter dated June 30,1994, Commonwealth Edisor. Company (Comed) submitted the .

Individual Plant Examination (IPE) for Braidwood Stab., Units 1 and 2, in response to Generic Letter (GL) 88 20,

• individual Plant Examination for Severe Accident Vulnerabilities." A revised -

submittal was made on March 27,1997.  :

The NRC, with the assistance of our contractor, Brookhaven National Laboratory, has reviewed both the original and revised suomittals, 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 GL 88 20 for Braidwood Station.

Please note that our review primarily focused on Comed's ability to examine Brainood, Units 1 and 2, for severe accident vulnerabilities. Although certain aspects of the IPE were explored in more detail, the review is not intended to validate the accuracy of Comed's detailed findings (or

• quantitative estimates) that stemmed from the examination. We did note that Comed identified a potential vulnerability involving a dual unit loss of essential service water from flooding. A l proposed modification was being considered, which when implemented, would reduce the core damage frequency (CDF) from about 4E-5/ year to about 6E 6/ year. If it is decided to implement '

i- the modification, please inform us so that, in the future, the correct CDF may be attributed to Braidwood. The enclosed Staff Evaluation Report does not constitute NRC approval or endorsement of any IPE material for purposes other than those associated with meeting the intent of GL 88 20.

Sincerely, Go F. Dick, Jr., nior Project Manager i Project Directorate 111-2 Division of Reactor Projects - lilllV Office of Nuclear Reactor Regulation Docket Nos. STN 50-456, STN 50-457 L

Enclosure:

As stated cc w/ encl: See next page 1

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_____..______.._.__-,~..__._-_~..:__.._.

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4

't I'. Johnson Braidwood Station

.' Comonwealth Edison Company Unit Nos. I and 2 cc:

Michael Hiller. Esquire Mr. Ron Stephens 4

Sidley and Austin Illinois Emergency Services One First National Plaza and Disaster Agency  ;

Chicago Illinois 60603 110 East Adams Street J Springfield. Illinois 62706 I Re ional Administrator - '

U. . NRC Region III Chairman 801 Warrenville Road Will County Board of Su mrvisors >

Lisle Illinois 60532-4351 Will Count Board Court 1ouse

~

Il11nois Department of Nuclear Safety Ms. Lorraine Creek Office of Nuclear Facility Safety Rt. 1. Box 182 1035 Outer Park Drive Manteno. Illinois 60950 Springfield.-Illinois 62704 Attorney General Document Control Desk-Licensing 500 South Second Street Commonwealth Edison Company Springfield Illinois 62701 1400 Opus Place. Suite 400 Downers Grove. Illinois 60515 George L. Edgar Morgan. Lewis and Bochius  :

Mr. William P. Poirier 1800 M Street N.W.

Westinghouse Electric Cor oration Washington, DC 20036 Energy ystems Business U it Post Of ice Box 355. Bay 236 West Comonwealth Edison Company Pittsburgh, Pennsylvania 15230 Braidwood Station Haneger Rt. 1. Box 84 Joseph Gallo -Braceville. Illinois 60407 Gallo & Ross 1250 Eye St. , N.W. , Suite 302 EIS Review Coordinator Washington. DC 20005 U.S. Environmental Protection Agency 77 W. Jackson Blvd.

Ms. Bridget Little Rorem Chicago, Illinois 40604-3590 ,

leseed Coordinator 1 North Linden Street Mr. H. G. Stanley Essex. Illinois 60935 Site Vice President Braidwood Station Howard A. Learner Comonwealth Edison Company Environmental Law and Policy RR #1. Box 84 Center of the Midwest Bracev111e. IL 60407 203 North LaSalle' Street '

Suite-1390 Chicago Illinois 60601 J U.S. Nuclear Regulatory Comission Braidwood Resident Inspectors Office

' Rural Route #1. Box 79 Bracev111e. Illinois 60407 w

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