ML20205Q519

Forwards SER Concluding That Quad Cities Nuclear Power Station,Unit 1 Can Be Safely Operated for Next Fuel Cycle with Weld O2BS-F4 in Current Condition Because Structural Integrity of Weld Will Be Maintained

ML20205Q519
Person / Time
Site:	Quad Cities
Issue date:	04/16/1999
From:	Pulsifer R NRC (Affiliation Not Assigned)
To:	Kingsley O COMMONWEALTH EDISON CO.
Shared Package
ML20205Q521	List: ML20205Q519 ML20205Q529
References
GL-88-01, GL-88-1, TAC-MA4174, NUDOCS 9904210288
Download: ML20205Q519 (3)

Text

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o WASHINGTON, D.C. 205(4-0001

% April 16,1999 l

Mr. Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company I Executive Towers West lll '

1400 Opus Place, Suite 500 Downers Grove, IL 60515

SUBJECT:

FLAW EVALUATION OF RECIRCULATION LINE WELD O2BS-F4 AT QUAD CITIES NUCLEAR POWER STATION, UNIT 1 (TAC NO. MA4174)

Dear Mr. Kingsley:

During the recent refueling outage for Unit 1 (Q1R15), Commonwealth Edison Company (Comed, the licensee) performed inservice inspection on the recirculation system piping using ultrasonic examination in accordance with Generic Letter 88-01, "NRC Position on IGSCC in BWR Austenitic Stainless Steel Piping." In a letter dated November 24,1998, the licensee reported that seven welds were found with flaw indications that exceeded the acceptance criteria in subarticle IWB-3500, " Acceptance Standards," of Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code),1989 Edition.

Additional information was provided by the licensee in conference calls held on November 19, 24 and 30,1998. Welds 02AD-F12 and 02AS-S4, exhibiting indications identified in the preceding outage, showed no change in flaw size and the previous flaw evaluation remains applicable and acceptable for continued operation for the next operating cycle. One new flaw indication was detected on weld 02BS-F4. A flaw evaluation was performed on this weld to justify continued operation without repair. Each of the four remaining indications on welds 02AD-F8,02BS-F7, O2AS-F9, and O2BS-F14 had a weld overlay repair applied in accordance with ASME Code Case N 504," Alternative Rules for Repair of Class 1,2, and 3 Austenitic Stainless Steel Piping, Section XI, Division 1."

The licensee performed a flaw evaluation on weld 02BS-F4 based on the indication detected by ultrasonic examination. Weld 02BS-F4 is an induction heating stress improvement treated flux weld fabricated by the shielded metal-arc welding (SMAW) process. The flaw was located on the pump suction side of the recirculation piping. The fracture mechanics evaluation was conducted using the procedures provided in Appendix C and Paragraph IWB-3640 of the ASME Code, Section XI. The crack growth evaluation to determine the projected crack depth was conducted using the procedures outlined in NUREG-0313, " Technical Report on Material Selection and Processing Guidelines for BWR Coolant Pressure Boundary Piping," Revision 2. )' ;

The results of the licensee's flaw evaluation have shown that Quad Cl ties Nuclear Power i Station, Unit 1, can be safely operated for the next operating cycle because the subject indications meet the criteria of IWB-3640, Section XI of the ASME Code.

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P13053 9904210288 990416 PDR ADOCK 05000254 j P PDR

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Mr. Oliver D. Kingsley l Based on a review of the licensee's submittal, the staff concludes that Quad Cities Nuclear Power Station, Unit 1, can be safely operated for the next fuel cycle with weld O2BS-F4 in its current condition because the structural integrity of the weld will be maintained. However, continued plant operation beyond the next fuel cycle will depend on the satisfactory evaluation

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i of the re-inspection results or implementing acceptable repairs during the next refueling outage.

The staff's safety evaluation is enclosed. This completes our effort for TAC No. MA4174.

Sincerely, Original signed by Robert M. Pulsifer, Project Manager, Section 2 Project Directorate til Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-254

Enclosure:

Safety Evaluation

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cc w/ encl: See next page l Distribution:

6 Docket File & PUBLIC PDill-2 r/f J. Zwolinski/S. Black C. Moore R. Pulsifer OGC,015B18 C. Thomas /A. Mendiola ACRS, T2E26 G. Grant, R!lli R. Norsworthy (SE only) l DOCUMENT NAME: A:/MA4174 A To receive a copy of this document. IndicatAthe byt:' ' C" = Copy without en osures "E" = Copy with enclosures "N" = No copy OFFICE PM:PD32 m & A:$2 #

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NAME RPULSlFEM DMDbAl) AIQlENDIDLA i I

DATE 04/ /6 /99~ OT/F /99 (04/ / 8/99 OFFICIAL RECORD COPY j

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l" O. Kingsley Quad Cities Nucicar Power Station .

Commonwealth Edison Company Units 1 and 2 l

cc:

Commonwealth Edison Company Vice President - Law and l

Quad Cities Station Manager Regulatory Affairs

22710 206th Avenue North MidAmerican Energy Company l Cordova, Illinois 61242-9740 One River Center Place 106 E. Second Street U.S. Nuclear Regulatory Commission P.O. Box 4350 Quad Cities Resident inspectors Office Davenport, Iowa 52808 22712 206th Avenue N.

Cordova, Illinois 61242 Mr. David Helwig Senior Vice President Chairman I Commonwealth Edison Company Rock Island County Board Executive Towers West 111 of Supervisors 1400 Opus Place, Suite 900 1504 3rd Avenue Downers Grove, Illinois 60515 Rock Island County Office Bldg.

Rock Island, Illinois 61201 Mr. Gene H. Stanley PWR Vice President Illinois Department of Nuclear Safety Commonwealth Edison Company l Office of Nuclear Facility Safety Executive Towers West ll1 1035 Outer Park Drive 1400 Opus Place, Suite 900 Springfield, Illinois 62704 Downers Grove, Illinois 60515 Regional Administrator Mr. Christopher Crane U.S. NRC, Region lli BWR Vice President l 801 Warrerville Road Commonwealth Edison Company l Lisle, Illinois 60532-4351 Executive Towers West 111 1 1400 Opus Place, Suite 900 William D. Leach Downers Grove, Illinois 60515 l Manager- Nuclear MidAmerican Energy Company Commonwealth Edison Company 907 Walnut Street Site Vice President - Quad Cities P.O. Box 657 22710 206th Avenue North Des Moines, Iowa 50303 Cordova, Illinois 61242-9740 I

Mr. R. M. Krich Commonwealth Edison Company Vice President - Regulatory Services Reg. Affairs Manager - Lluad Cities Commonwealth Edison Company 22710 206th Avenue N. i Executive Towers West 111 Cordova, Illinois 61242-9740 ,

1400, Opus Place, Suite 500 i Downers Grove, Illinois 60515 Ms. Pamela G. Stroebel Senior Vice President and General Counsel :

l Document Control Desk-Licensing Commonwealth Edison Company Commonwealth Edison Company P.O. Box 767 1400 Opus Place, Suite 400 Chicago, Illirsois 60690-0767 Downers Grove, Illinois 60515

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