ML11307A175
| ML11307A175 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/24/2011 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| Download: ML11307A175 (3) | |
Text
1 SeabrookNPEm Resource From:
Plasse, Richard Sent:
Wednesday, August 24, 2011 12:34 PM To:
Cliche, Richard
Subject:
Draft RAI Attachments:
Draft _ Class 1 Valve Follow-up (3).docx Follow-up RAI.
Hearing Identifier:
Seabrook_License_Renewal_NonPublic Email Number:
2262 Mail Envelope Properties (Richard.Plasse@nrc.gov20110824123300)
Subject:
Draft RAI Sent Date:
8/24/2011 12:33:37 PM Received Date:
8/24/2011 12:33:00 PM From:
Plasse, Richard Created By:
Richard.Plasse@nrc.gov Recipients:
"Cliche, Richard" <Richard.Cliche@fpl.com>
Tracking Status: None Post Office:
Files Size Date & Time MESSAGE 21 8/24/2011 12:33:00 PM Draft _ Class 1 Valve Follow-up (3).docx 27903 Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
DRAFT Follow-up RAI 4.3-1c
Background:
By letter dated April 22, 2011, the applicant responded to RAI 4.3-1b stating that the pressure boundary portion of the ASME Class 1 valves were designed, analyzed, and qualified for service (including fatigue) in accordance with the rules of ASME Code Section III Subsection NB-3500. UFSAR Table 5.2-1 identifies the code edition and addenda applicable to the design of the following types of Class 1 valves: pressurizer safety valves, motor-operated valves, manual valves, control valves, and pressurizer spray valves in the reactor coolant systems.
UFSAR Table 5.2-10 also identifies the valves that are included in the reactor coolant pressure boundary.
Issue:
The staff noted that, in the 1971 and later editions of the ASME Section III Code, paragraphs NB-3545.3 and NB-3550 required fatigue analyses for valves that have an inlet piping connection larger than 4 inches nominal pipe size unless the exemption requirements of NB-3222.4(d) are met. The staff also noted that the 1968 Draft ASME Pump and Valve Code Sections 452 and 454 included applicable time-dependent cyclic or fatigue assessment criteria to be performed if the inlet piping connection larger than 4 inches nominal pipe size. It is not clear to the staff if the fatigue analyses for these Class 1 valves were performed in accordance with the requirements of the applicable ASME codes.
Request:
Identify all the Class 1 valves that did not have a fatigue analysis performed as part of the design-basis and their associated design code. In addition, justify why a fatigue analysis was not required for these Class 1 valves in accordance with the ASME Section III Code or the ASME Draft Pump and Valve Code, with reference to the applicable sections of the design code.
If a fatigue analysis was performed as part of the design-basis for Class 1 valves, justify the conclusion that the fatigue analyses for these Class 1 valves do not need to be identified as a TLAA in accordance with 10 CFR 54.21(c)(1).
Confirm that Class 1 valves were designed, analyzed, and qualified for service (including fatigue) in accordance with the rules of ASME Section III Subsection NB-3500, or describe any exemptions.
Amend LRA section 4.3.1, as appropriate to explicitly list Class 1 piping and valves and confirm the disposition of 10 CFR 54.21 (c)(1).i remains valid for the period of extended operation.
Update the Table provided in RAI response RAI 4.3-1b, dated April 22, 2011, to include any additional CUF values for Class 1 valves not previously identified.
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