ML23018A098
| ML23018A098 | |
| Person / Time | |
|---|---|
| Issue date: | 01/25/2023 |
| From: | Thomas Scarbrough NRC/NRR/DEX/EMIB |
| To: | |
| References | |
| Download: ML23018A098 (15) | |
Text
NRC Staff Presentation on Status of Motor-Operated Valve Regulatory Activities Thomas G. Scarbrough Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Motor-Operated Valve Users Group Meeting January 23-25, 2023 1
10 CFR 50.55a Rulemaking Activities
- ASME Code Case Final Rule (Revision 39)
- ASME Operation and Maintenance of Nuclear Power Plants (OM Code), 2020 Edition, and ASME Boiler and Pressure Vessel Code (BPV Code), 2019 Edition, Final Rule
- Inservice Inspection (ISI)/Inservice Testing (IST) Program Code of Record (COR) Interval and Code Case Proposed Rule (Revision 40)
- Streamlining of 10 CFR 50.55a (Embark Project) 2
ASME Code Case Rule (Revision 39)
- Final Rule issued March 3, 2022, in Federal Register (87 FR 11934).
- RG 1.192 (Revision 4), Operation and Maintenance Code Case Acceptability, ASME OM Code, incorporated by reference in 10 CFR 50.55a with final rule.
- Acceptability of ASME OM Code Cases addressed in RG 1.192 (Revision 4) up to Code Case OMN-27.
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ASME OM Code 2020 Edition Final Rule
- Final rule issued on October 27, 2022 (effective 11-28-2022) in 87 FR 65128
- 50.55a changes include:
- Incorporated by reference 2020 Edition of ASME OM Code.
- Removed 2011 Addenda and 2015 Edition of OM Code.
- Accepted Subsection ISTE (2020 Edition) without conditions.
- Clarified 50.55a(f)(4) and (g)(4) for snubbers.
- Added 50.55a(f)(7) to require IST Program Plan submittals.
- Revised 50.55a(b)(3)(xi) to allow increased flexibility for the valve position verification schedule for valves not susceptible to stem-disk separation by directly accepting Code Case OMN-28; and to allow schedule flexibility for initial implementation of ISTC-3700 as supplemented by (b)(3)(xi) where justification available for review.
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ISI/IST Program COR Interval and Code Case Proposed Rule (Revision 40) 5
SECY-21-0029 In SECY-21-0029 dated March 15, 2021 (ML20273A286), the NRC staff requested Commission approval to initiate a proposed rulemaking plan that would amend 10 CFR 50.55a to extend the COR interval for IST and ISI programs.
The proposed rulemaking plan included the following:
- Prepare a proposed rule to increase from 10-year COR interval to 20-year COR interval for licensees that have updated their IST/ISI Programs to the 2019 Edition of the ASME BPV Code and the 2020 Edition of the ASME OM Code
- Prepare a proposed rule to extend the COR interval from 20 years to 24 years in the future if ASME increases ISI interval to 12 years
- Request delegation of signature authority for these rulemakings to the Executive Director for Operations (EDO)
Provided other information on 10 CFR 50.55a streamlining efforts.
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SRM-21-0029
- Commission issued Staff Requirements Memorandum SRM-21-0029 on November 8, 2021 (ML21312A490) approving both proposed rulemakings.
- Commission approved delegation of the signature authority for these two rulemakings to the EDO.
- Commission stated that the NRC staff should move expeditiously to implement the remaining EMBARK 10 CFR 50.55a streamlining recommendations.
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Changes to SECY-21-0029 Plan NRC staff planned to combine ISI/IST COR interval rulemaking with ASME Code Case Revision 40 rulemaking.
In 2022, ASME published BPV Code Case N-921 and OM Code Case OMN-31, which allow 12-year ISI and IST program intervals, respectively, as an alternative to the 10-year intervals currently required by the ASME Codes. ASME requested Code Case N-921 be included in the Revision 40 rulemaking (ML22046A112).
With certain conditions, the inclusion of these code cases would create an option for a licensee to implement either a 10-year or a 12-year ISI/IST program interval. To be consistent and aligned, the same option needs to be in place for the COR interval.
Therefore, the NRC staff determined the need to inform the Commission of the planned rulemaking changes from the original plan described in SECY-21-0029.
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SECY-22-0075 On August 1, 2022, the NRC staff sent Informational Paper SECY-22-0075 (ML22124A178) to the Commission.
In SECY-22-0075, the NRC staff explains the changes to the plan described in SECY-21-0029 and how the staff plans to develop the proposed rule.
Three major changes are:
- Combine the two proposed rulemakings into one rulemaking
- Make conforming changes to 10 CFR Part 50, Appendix J
- Propose conforming and clarifying changes to address issues encountered during the development of the proposed rule The following three slides summarize this information in SECY 0075.
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Combined Proposed Rulemaking Needed to avoid a misalignment, e.g., 20-year COR interval with a 12-year ISI interval Condition both code cases to allow their use only by licensees that have updated to the ASME BPV Code, 2019 Edition, and ASME OM Code, 2020 Edition, or later. This is needed to maintain consistency with SECY-21-0029 (only 20- or 24-year COR interval would be acceptable)
Linking the COR update to the ASME ISI/IST program interval to ensure alignment, e.g., COR interval would be equal to two consecutive ISI or IST program intervals once a licensee has updated to the most recent edition of the code incorporated by reference in 10 CFR 50.55a 10
Changes to 10 CFR Part 50, Appendix J Appendix J contains requirements for containment leak testing (including containment isolation valves).
Type A tests for Option A requires three leak tests, the third must be performed when the plant is shutdown for the 10-year plant inservice inspection. References 10 CFR 50.55a for these tests.
A proposed revision to Appendix J would conform with the proposed changes to 10 CFR 50.55a consistent with the alternative 12-year ISI/IST program interval.
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Other 10 CFR 50.55a Possible Changes Current version of 10 CFR 50.55a refers to the current 120-month interval requirement in a variety of ways. NRC staff plans to propose changes to 10 CFR 50.55a to establish consistency in the terminology (e.g., ISI interval, IST interval, and COR interval).
NRC staff plans to develop a definition section to enhance regulatory clarity and modify the language of 10 CFR 50.55a to be consistent with those definitions.
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Proposed Rule
- NRC staff is planning the next 10 CFR 50.55a rulemaking that will follow the rulemaking described in SECY-22-0075
- NRC staff has initiated preparation of a proposed rule to incorporate by reference the 2022 Edition of the ASME OM Code into 10 CFR 50.55a.
- NRC staff is evaluating whether any new or modified conditions are needed when the 2022 Edition of the ASME OM Code is incorporated by reference in 10 CFR 50.55a
- Proposed rule planned to be issued in 2023.
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Streamlining 10 CFR 50.55a Rulemaking
- NRC staff working group formed in response to Commission direction to implement remaining EMBARK recommendations to streamline 10 CFR 50.55a rulemaking.
- Goal is to develop a process to provide for annual incorporation by reference of unconditionally-approved Code Cases, and biennial incorporation by reference of ASME Code editions and conditionally-approved Code Cases, in 10 CFR 50.55a.
- NRC staff discussed the working group activities during the NRC Standards Forum on September 28, 2022.
- Working group will reach out to stakeholders when more information is available.
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QUESTIONS?
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