ML13022A088

San Onofre, Unit 2, Response to Request for Additional Information (RAI 19) Regarding Confirmatory Action Letter Response (TAC No. Me 9727)

ML13022A088
Person / Time
Site:	San Onofre
Issue date:	01/16/2013
From:	St.Onge R J Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC ME9727
Download: ML13022A088 (4)

Text

\\V SOUTHERN CALIFORNIAEDISONAn EDISON INTERNATIONAL CompanyRichard J. St. OngeDirector, Nuclear Regulatory Affairs andEmergency PlanningJanuary 16, 201310 CFR 50.4U.S. Nuclear Regulatory CommissionATTN: Document Control DeskWashington, DC 20555-0001

Subject:

Docket No. 50-361Response to Request for Additional Information (RAI 19)Regarding Confirmatory Action Letter Response(TAC No. ME 9727)San Onofre Nuclear Generating Station, Unit 2

References:

1. Letter from Mr. Elmo E. Collins (USNRC) to Mr. Peter T. Dietrich (SCE), datedMarch 27, 2012, Confirmatory Action Letter 4-12-001, San Onofre NuclearGenerating Station, Units 2 and 3, Commitments to Address Steam GeneratorTube Degradation2. Letter from Mr. Peter T. Dietrich (SCE) to Mr. Elmo E. Collins (USNRC), datedOctober 3, 2012, Confirmatory Action Letter -Actions to Address SteamGenerator Tube Degradation, San Onofre Nuclear Generating Station, Unit 23. Letter from Mr. James R. Hall (USNRC) to Mr. Peter T. Dietrich (SCE), datedDecember 26, 2012, Request for Additional Information Regarding Responseto Confirmatory Action Letter, San Onofre Nuclear Generating Station, Unit 2

Dear Sir or Madam,

On March 27, 2012, the Nuclear Regulatory Commission (NRC) issued a Confirmatory ActionLetter (CAL) (Reference 1) to Southern California Edison (SCE) describing actions that the NRCand SCE agreed would be completed to address issues identified in the steam generator tubesof San Onofre Nuclear Generating Station (SONGS) Units 2 and 3. In a letter to the NRC datedOctober 3, 2012 (Reference 2), SCE reported completion of the Unit 2 CAL actions andincluded a Return to Service Report (RTSR) that provided details of their completion.By letter dated December 26, 2012 (Reference 3), the NRC issued Requests for AdditionalInformation (RAIs) regarding the CAL response. Enclosure 1 of this letter provides theresponse to RAI 19.P.O. Box 128San Clemente, CA 92672 Document Control Desk January 16, 2013There are no new regulatory commitments contained in this letter. If you have any questions orrequire additional information, please call me at (949) 368-6240.Sincerely,

Enclosures:

1. Response to RAI 19cc: E. E. Collins, Regional Administrator, NRC Region IVJ. R. Hall, NRC Project Manager, SONGS Units 2 and 3G. G. Warnick, NRC Senior Resident Inspector, SONGS Units 2 and 3R. E. Lantz, Branch Chief, Division of Reactor Projects, NRC Region IV ENCLOSURE 1SOUTHERN CALIFORNIA EDISONRESPONSE TO REQUEST FOR ADDITIONAL INFORMATIONREGARDING RESPONSE TO CONFIRMATORY ACTION LETTERDOCKET NO. 50-361TAC NO. ME 9727Response to RAI 19Page 1 RAI 19Reference 1, Section 11.2, page 52 -Provide additional details on how the GE Smart SignalSystem will be used in the context of tube-to-tube wear and/or the circumstances associatedwith tube-to-tube wear. What information/data will the system be evaluating? For whatpurpose?RESPONSEAs stated in the RAI Reference 1, Section 11.2, GE Smart SignalTM will be used as "an analytictool that aids in diagnosis of equipment conditions. The tool will be used to analyze historicalplant process data from the Unit 2 steam generators (SGs) following the inspection interval."GE Smart SignalTM will be used as a backward looking tool to assist in the investigation of anyadditional tube-to-tube wear identified during the mid-cycle inspection. GE Smart SignalTM isnot included as a Defense in Depth measure in section 9 of RAI Reference 1.GE Smart SignalTM is a software program used to trend and monitor variances in plantequipment (such as pressures, temperatures, flowrate, speed, feedwater pump and turbinevibration). GE Smart SignalTM will be monitoring the following equipment:1. Unit 2 Steam Generators2. Unit 2 Main Feedwater Pumps3. Unit 2 Main Feedwater TurbinesPage 2