ML11360A044
| ML11360A044 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 12/16/2011 |
| From: | Office of Nuclear Reactor Regulation |
| To: | Division of License Renewal |
| References | |
| Download: ML11360A044 (3) | |
Text
1 Davis-BesseNPEm Resource From:
CuadradoDeJesus, Samuel Sent:
Friday, December 16, 2011 1:46 PM To:
custerc@firstenergycorp.com; dorts@firstenergycorp.com Cc:
Davis-BesseHearingFile Resource
Subject:
Draft RAI 3.1.2.2.16-3 Attachments:
DB RAI 3 1 2 2 16-3 Tube to tubesheet welds v5 12-12-2011.DOCX
- Cliff, Attached is our next Draft RAI on the SG tube to tbe sheet welds. Ill try to issue it next week.
- Regards, Samuel Cuadrado de Jesús Project Manager Projects Branch 1 Division of License Renewal U.S. Nuclear Regulatory Commission Phone: 301-415-2946 Samuel.CuadradoDeJesus@nrc.gov
Hearing Identifier:
Davis_BesseLicenseRenewal_Saf_NonPublic Email Number:
2787 Mail Envelope Properties (377CB97DD54F0F4FAAC7E9FD88BCA6D0806FB41099)
Subject:
Draft RAI 3.1.2.2.16-3 Sent Date:
12/16/2011 1:46:29 PM Received Date:
12/16/2011 1:46:30 PM From:
CuadradoDeJesus, Samuel Created By:
Samuel.CuadradoDeJesus@nrc.gov Recipients:
"Davis-BesseHearingFile Resource" <Davis-BesseHearingFile.Resource@nrc.gov>
Tracking Status: None "custerc@firstenergycorp.com" <custerc@firstenergycorp.com>
Tracking Status: None "dorts@firstenergycorp.com" <dorts@firstenergycorp.com>
Tracking Status: None Post Office:
HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 384 12/16/2011 1:46:30 PM DB RAI 3 1 2 2 16-3 Tube to tubesheet welds v5 12-12-2011.DOCX 36030 Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
Page 1 of 1 DB RAI 3.1.2.2.16-3
=
Background===
By letter dated November 23, 2011, the applicant responded to RAI 3.1.2.2.16-2, which addresses the extent and method of the inspections to manage cracking due to primary water stress corrosion cracking (PWSCC) of the steam generator (SG) tube-to-tubesheet welds. In its response, the applicant indicated that a gross visual inspection coupled with eddy-current inspections will be performed on the steam generator tube-to-tubesheet welds. The applicant also indicated that the inspection schedule will be concurrent with the eddy-current inspections of the SG tubes in accordance with Davis-Besse Technical Specification 5.5.8, Steam Generator (SG) Program. The applicant further indicated that at a minimum, 100% of the tubes are inspected at sequential periods of 60 effective full power months.
Issue In its review, the staff noted that it is not clear whether the gross visual inspection of the tube-to-tubesheet welds will include the welds on the hot leg, cold leg, or both legs. The staff also needs more clarifications on the extent and method of the visual inspection addressed in the applicants response.
Request
- 1. Clarify whether the visual inspection will be conducted on the welds on the hot leg, cold leg, or both legs. In addition, describe the extent of the visual inspection (i.e., what percentage of the welds will be inspected), and clarify whether the visual inspection will be conducted on each tube-to-tubesheet weld.
- 2. Provide information on the objective, equipment, and method of the visual inspections.