RS-16-166, Supplemental Information Related to Inservice Inspection Interval Relief Request I5R-08
Letter Sequence Supplement | |
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Initiation Administration Questions
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MONTHYEARRS-16-130, Inservice Inspection Interval Relief Request 15R-082016-06-30030 June 2016
[Table View]Inservice Inspection Interval Relief Request 15R-08 Project stage: Request ML16229A5472016-08-18018 August 2016 Supplemental Information Needed for Acceptance of Requested Licensing Action Inservice Inspection Interval Relief Request (15R-08) Project stage: Acceptance Review ML16235A0852016-08-18018 August 2016 NRR E-mail Capture - (CAC Nos. MF8090/MF8091) DNPS, Units 2 and 3 - Proposed Alternative for Inservice Inspection Interval (I5R-08) Project stage: Other RS-16-166, Supplemental Information Related to Inservice Inspection Interval Relief Request I5R-082016-08-22022 August 2016 Supplemental Information Related to Inservice Inspection Interval Relief Request I5R-08 Project stage: Supplement ML16243A4892016-09-0101 September 2016 Acceptance of Requested Licensing Action Inservice Inspection Interval Proposed Alternative (I5R-08) Project stage: Acceptance Review ML17073A1212017-06-28028 June 2017 Issuance of Safety Evaluation Inservice Inspection Interval Proposed Alternative (I5R-08) Project stage: Approval 2016-08-22 |
ML16236A251 | |
Person / Time | |
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Site: | Dresden ![]() |
Issue date: | 08/22/2016 |
From: | Simpson P Exelon Generation Co |
To: | Document Control Desk, Office of Nuclear Reactor Regulation |
References | |
CAC MF8090, CAC MF8091, RR-I5R-08, RS-16-166 | |
Download: ML16236A251 (3) | |
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Text
Exelon Generation RS-16-166 10 CFR 50.55a(z)(1)
August2 2,2016 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, D.C. 20555-0001 Dresden Nuclear Power Station, Units 2 and 3 Renewed Facility Operating License Nos. DPR-19 and DPR-25 NRC Docket Nos. 50-237 and 50-249
Subject:
Supplemental Information Related to Dresden Nuclear Power Station lnservice Inspection Interval Relief Request 15R-08
References:
(1) Letter from P. R. Simpson (Exelon Generation Company, LLC (EGC)) to NRC, "Dresden Nuclear Power Station lnservice Inspection Interval Relief Request 15R-08," dated June 30, 2016 (2) Letter from R. S. Haskell (NRC) to B. C. Hanson (EGC), "Dresden Nuclear Power Station, Unit Nos. 2 and 3 - Supplemental Information Needed for Acceptance of Requested Licensing Action Re: lnservice Inspection Interval Proposed Alternative (15R-08) (CAC Nos. MF8090 and MF8091 ),"
dated August 18, 2016 In Reference 1, EGC requested relief from weld inspection frequency requirements in accordance with ASME Code Case N-702, "Alternative Requirements for Boiling Water Reactor (BWR) Nozzle Inner Radius and Nozzle-to-Shell Welds,Section XI, Division 1," and Boiling Water Reactor Vessel Inspection Program (BWRVIP)-241, "Probabilistic Fracture Mechanics Evaluation for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Blend Radii."
During its review of the Reference 1 request, the NRC determined that supplemental information is required for the NRC to conduct a detailed technical review of the request as documented in Reference 2.
EGC's response to the NRC's Reference 2 request is contained in the attachment to this letter.
Augu st22, 2016 U.S. Nuclear Regulatory Commission Page 2 There are no regulatory commitments contained within this letter. Should you have any questions concerning this letter, please contact Mr. Mitch el A. Mathews at (630) 657-2819.
Si~((
Patrick R. Simpson Manager - Licensing Exelon Generation Company, LLC
Attachment:
Supplemental Information Related to Dresden Nuclear Powe r Station lnservice Inspection Interval Relief Request 15R-08
Supplemental Inform ation Related to Dresden Nuclea r Power Station lnserv lce Inspec tion Interval Relief Request ISR-08 Following is the NRC's request for supplemental information in bold italicize d font followed by Exelon Generation Company LLC's (EGC's) response:
Section 5 (pg. 2 of 8) of the submi ttal (RS-16-2016), dated June 30, 2016, states, in part:
" .. .includ ing at least one nozzle from each system and nomin al pipe size, during each inspec tion interva l [emph asis added ] in accord ance with ASME code Case N-702... ":
1.) Please clarify what is meant by "inspe ction interva l," as annota ted in the submit tal. Will the Code Case N-702 examin ation require ments at DNPS for the curren t fifth 10-year /SI interva l (endin g on Janua ry 20, 2023) and the subse quent sixth 10-year IS/ interva l (cover ing the period until the renew ed operat ing license s expire ) contin ue to be met?
EGC Response:
Each inspection interval described in Attachment 1, Section 5 of the June 30, 2016, submittal refers to the Dresden Nuclear Power Station (DNPS), Units 2 and 3 current fifth and upcoming sixth 120-month lnservice Inspection (ISi) Program intervals. The Code Case N-702 examination requirements will be met during this entire timeframe.
Specifically, a minimum of 25% of nozzle inner radii and nozzle-to-shel l welds, including at least one nozzle from each system and nominal pipe size, as identifie d in Relief Request ISR-08 will be examined during each 120-month ISi inspection interval in accordance with the conditions for the implementation of Code Case N-702.
These conditions are defined in NRC Regulatory Guide 1.147, Rev. 17, "lnserv ice Inspection Code Case Acceptability, ASME Section XI, Division 1." EGC will adhere to these requirements during both of the remaining DNPS, Units 2 and 3 120-mo nth ISi Program intervals which span the balance of the DNPS, Units 2 and 3 period of extended operation.
2.) Please descri be the impact, if any, on the inspec tion freque ncy for the subjec t welds and inner radii.
EGC Response:
EGC does not plan to deviate from the previously evaluated Code Case N-702 examination frequency for the welds described in the June 30, 2016, reques t.
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