ML20196F522

Informs That NRC Finds Util Assessment of Two Old & One New Flaw Indications on Recirculation Sys Piping Acceptable.Nrc Agrees with Assessment That Plant Can Be Safely Operated for Next Operating Cycle of 24 Months with Indications Present

ML20196F522
Person / Time
Site:	Quad Cities
Issue date:	12/02/1998
From:	Pulsifer R NRC (Affiliation Not Assigned)
To:	Kingsley O COMMONWEALTH EDISON CO.
References
GL-88-01, GL-88-1, TAC-MA4174, NUDOCS 9812070059
Download: ML20196F522 (5)

Text

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. g j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20066-0001 f a f

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December 2, 1998 i

Mr. Oliver D. Kingsley, President Nuclear Generation Group {

Commonwealth Edison Company Executive Towers West til 1400 Opus Place, Suite 500 Downers Grove,IL 60515

SUBJECT:

EVALUATION OF INDICATIONS ON RECIRCULATION SYSTEM PIPING - QUAD CITIES NUCLEAR POWER STATION, UNIT 1 (TAC NO. MA4174)

Dear Mr. Kingsley:

The purpose of this letter is to inform you that we find acceptable your assessment of the two old and one new flaw indications on the recirculation system piping. We agree with your  !

assessment that the plant can be safely operated for the next operating cycle of 24 months with indications present.

In a letter dated November 24,1998, Commonwealth Edison Company (Comed) stated that

! seven welds were found with indications during this outage (Q1R15), four of which were new ,

indications. Welds 02AD-F12 and 02AS-S4 with indications identified the last outage showed  !

no change in flaw size and their previous flaw evaluation continues to be applicable. One new indication on weld 02BS-F4 was found this outage that did not meet the criteria of Section XI of l the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code),1989 Edition, for continued operation without evaluation. Comed has determined this weld to be acceptable and provided flaw evaluations justifying continued operation. The flaw .

evaluation was performed in accordance with the methodology and acceptance criteria i specified in subarticle IWB-3640 of Section XI, ASME Code,1989 Edition. The remaining four indications on welds 02AD-F8,02BS-F7,02AS-F9 and 02BS-F14, each had a weld overlay repair applied in accordance with ASME Code Case N-504,"Altemative Rules for Repair of Class 1, .?, and 3 Austenitic Stainless Steel Piping,Section XI, Division 1." In telephone discussions on November 19,24, and 30, the NRC staff discussed these indications and your assessment of them.

Our conclusion that continued operation is acceptable for the next operating cycle of 24 months is based on your acceptable fracture mechanics analysis, upon your inspection data that show that the two flaw indications have existed since the previous outage without any apparent change in size or location, and the application of weld overlay repairs on the remaining four flawed welds. We also note that Comed will reclassify all 28-inch diameter recirculation system welds in Unit 1 that were treated with the Induction Heating Stress improvement process (IHSI) ,

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9812070059 981202 7 Q(C ,o i

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c O. Kingsley from Category C to Category D as defined in Generic Letter 88-01 and continue to inspect the remaining welds treated with the IHSI process to the Category D frequency. Our complete safety evaluation will be transmitted in a letter to follow.

Sincerely,

, 2 Robert M. Pulsifer, Project Manager Project Directorate 111-2 Division of Reac+or Projects - lil/IV Office of Nuclear Reactor Regulation Docket No. 50-254 cc w/enci: See next page r

4 O. Kingsley December 2, 1998 from Category C to Category D as defined in Generic Letter 88-01 and continue to inspect the remaining welds treated with the IHS! process to the Category D frequency. Our complete safety evaluation will be transmitted in a letter to follow.

Sincerely, 1

l ORIG. SICJMD BY l Robert M. Pulsifer, Project Manager l Project Directorate 111-2 l Division of Reactor Projects - lil/IV Office of Nuclear Reactor Regulation 1

Docket No. 50-254 l

cc w/ encl: See next page DISTRIBUTION:

pmu PUBLIC PDill-2 r/f EAdensam, EGA1 SRichards I CMoore RPulsifer OGC,015B18 ACRS, T2E26 MRing, Rill ESull1 van DOCUMENT NAME: G:\PD3-2\CM\ QUAD \QC4174.LTR Ta receive a copy of this document,indiceteAthe tpx: "C" = Copy without enclosures "E" = Copy with enclosures "N" = No copy l OFFICE PM:PDill-2 C 1A:$ 11- 2 6EMCB fa D:PDill-2 C4 NAME RPULSIFER:C ONIOORE ESULLIVAN fGb SRICHARDS 5tF l DATE 12/ / /98 12/ 1 /98 g j2/ / /98 /) 12/ 2.198 j OFFICIAL RECORD COPY  !

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O. Kingsley . . Quad Cities Nuclear Power Station .  !

Commonwealth Edison Company Units 1 and 2 i

cc:

e l Michael 1. Miller, Esquire Vice President- Law and i l Sidley and Austin. Regulatory Affairs One FL3t National Plaza l MidAmerican Energy Company 1 Chicago, Illinois 60603 One River Center Place .

.106 E. Second Street Commonwealth Edison Company P.O. Box 4350 Quad Cities Station Manager Devenport, Iowa 52808 1 22710 206th Avenue N. i Cordova, Illinois 61242-9740 Document Control Desk-Licensing  !

Commonwealth Edison Company  !

U.S. Nuclear Regulatory Commission 1400 Opus Place, Suite 400  ;

Quad Cities Resident inspectors Office Downers Grove, Illinois 60515 i 22712 206th Avenue N.

Cordova, Illinois 61242 ' Mr. David Helwig l- Senior Vice President t L

Chairman Commonwealth Edison Company  !

l Rock Island County Board Executive Towers West lli f of Supervisors 1400 Opus Place, Suite 900 1504 3rd Avenue Downers Grove, IL 60515 i Rock Island County Office Bldg.  :

Rock Island, Illinois 61201 Mr. Gene H. Stanley PWR's Vice President Illinois Department of Nuclear Safety Commonwealth Edison Company ,

Office of Nuclear Facility Safety Executive Towers West lll  !

1035 Outer Park Drive 1400 Opus Place, Suite 900  !

Springfield, Illinois 62704 Downers Grove,IL 60515 1

Regional Administrator Mr. Steve Perry U.S. NRC, Region lli BWR's Vice President 801 Warrenville Road Commonwealth Edison Company l Lisle, Illinois 60532-4351 Executive Towers West 111 .

1400 Opus Place, Suite 900 l l William D. Leach Downers Grove,IL 60515 Manager- Nuclear L MidAmerican Energy Company Mr. Dennis Faner l 907 Walnut Street Regulatory Services Manager l- P.O. Box 657 Commonwealth Edison Company l Des Moines, Iowa 50303 Executive Towers West lli 1400 Opus Place, Suite 500 Commonwealth Edison Company Downers Grove, IL 60515 Site Vice President- Quad Cities 22710 206th Avenue N.

Cordova, Illinois 61242-9740 l

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li O. Kingsley Quad Cities Nuclear Power Plant .

I Commonwealth Edison Company Units 1 and 2 Ms. Irene Johnson, Licensing Director p Nuclear Regulatory Services l Commonwealth Edison Company l Executive Towers West 111 l 1400 Opus Place, Suite 500 l- Downers Grove,IL 60515 Commonwealth Edison Company Reg. Assurance Supervisor- Quad Cities L

22710 206th Avenue N.

Cordova, Illinois 61242-9740 Mr. Michael J. Wallace Senior Vice President Commonwealth Edison Company Executive Towers West lil 1400 Opus Place, Suite 900 Downers Grove,IL 60515 l

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