ML102850587
| ML102850587 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/11/2010 |
| From: | Office of Nuclear Reactor Regulation |
| To: | Division of License Renewal |
| References | |
| Download: ML102850587 (3) | |
Text
1 DiabloCanyonNPEm Resource From:
Ferrer, Nathaniel Sent:
Wednesday, August 11, 2010 3:03 PM To:
Grebel, Terence; Soenen, Philippe R Cc:
DiabloHearingFile Resource
Subject:
Draft RAI Set 20 - Aging Management Programs Attachments:
Draft RAI Set 20 AMP RAIs.doc Terry and Philippe, Attached is Draft RAI Set 20 containing draft RAIs, specifically on portions aging management programs.
Please review the attached draft RAIs and let me know if and when you would like to have a teleconference call. The purpose of the call will be to obtain clarification on the staff's request.
Please let me know if you have any questions.
NathanielFerrer ProjectManager DivisionofLicenseRenewal OfficeofNuclearReactorRegulation U.S.NuclearRegulatoryCommission (301)4151045
Hearing Identifier:
DiabloCanyon_LicenseRenewal_NonPublic Email Number:
1934 Mail Envelope Properties (26E42474DB238C408C94990815A02F090A76F54E2F)
Subject:
Draft RAI Set 20 - Aging Management Programs Sent Date:
8/11/2010 3:03:14 PM Received Date:
8/11/2010 3:03:14 PM From:
Ferrer, Nathaniel Created By:
Nathaniel.Ferrer@nrc.gov Recipients:
"DiabloHearingFile Resource" <DiabloHearingFile.Resource@nrc.gov>
Tracking Status: None "Grebel, Terence" <TLG1@PGE.COM>
Tracking Status: None "Soenen, Philippe R" <PNS3@PGE.COM>
Tracking Status: None Post Office:
HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 554 8/11/2010 3:03:14 PM Draft RAI Set 20 AMP RAIs.doc 51706 Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
Diablo Canyon Nuclear Power Plant, Units 1 and 2 (DCPP)
License Renewal Application (LRA)
Draft Request for Additional Information Set 20 Aging Management Programs D-RAI B2.1.9 The detection of aging effects of the Open-Cycle Cooling Water System Aging Management Program in the GALL Report,Section XI.M20 indicates that the program includes inspections for detecting degradation.
The Diablo Canyon Power Plant Open-Cycle Cooling Water System includes the aging management of cracking for titanium components exposed to raw water. The Open-Cycle Cooling Water System Program describes that it will evaluate cracking found in coatings by visual inspection, but does not discuss how cracking in the titanium components is managed.
Provide additional information on how cracking in titanium components will be managed by the Open-Cycle Cooling Water System Program. If visual inspection will be used, provide details on how the visual inspection will be implemented to take into consideration the tightness of cracks that can form in titanium.
D-RAI B2.1.21-5
Background:
LRA Section A1.21 provides the UFSAR Supplement summary description for applicants AMP B2.1.21, Flux Thimble Tube Inspection Program, and states in part [t]he inspection frequency may be adjusted based upon items such as operating experience and recommendations from the Westinghouse Owners Group.
NRC Bulletin 88-09 permits an applicant for a Westinghouse-design PWR facility to rebaseline the inspection frequency for its flux thimble tubes based on the use of actual plant-specific wear data, which is reflected in the staffs recommended FSAR Supplement in the SRP-LR.
Issue: The staff noted that neither NRC Bulletin 88-09 nor the SRP-LR account for the possibility that generic vendor or owners group recommendations may be used as an acceptable basis for rebaselining the inspection frequency for a Westinghouse plants flux thimble tubes. The provision in UFSAR Supplement A1.21 permitting for thimble tube inspection frequency adjustment based upon items such as operating experience and recommendations from the Westinghouse Owners Group does not conform to any of the monitoring and trending recommendations for flux thimble tube programs in NRC Bulletin 88-09, the GALL Report, or the SRP-LR.
Request: Justify why the UFSAR Supplement incorporates a monitoring and trending option that would permit the applicant to use Westinghouse Ownders Group recommendations to adjust the inspection frequency criterion for the plants flux thimble tubes. Justify this option when it does not appear to be consistent with either the staffs recommendations in NRC Bulletin 88-09 or the staffs monitoring and trending program element recommendations in GALL AMP XI.M37.