ML24003A763

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Mug 2024 MOV Regulatory Activity (Scarbrough) Final
ML24003A763
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Issue date: 01/31/2024
From: Thomas Scarbrough
NRC/NRR/DEX/EMIB
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Download: ML24003A763 (31)
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Status of NRC Regulatory Activity on Motor-Operated Valves Thomas G. Scarbrough Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Motor-Operated Valve Users Group Meeting January 2024 1

Disclaimer

  • This presentation was prepared by staff of the U.S. Nuclear Regulatory Commission (NRC). It may present information that does not currently represent an agreed upon NRC staff position. NRC has neither approved nor disapproved the technical content.

2

Topics

1. 10 CFR 50.55a Rulemaking
2. EPA Ban on decaDBE Material
3. ASME OM-2 Code
4. ASME QME-1-2023 and Reformatted Version
5. Appendix III Startup
6. 10 CFR 50.55a(b)(3)(ii)(D) Scope 3

10 CFR 50.55a Rulemaking 4

Recent and Current 10 CFR 50.55a Rulemakings

  • 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)
  • ASME OM Code, 2022 Edition, and ASME BPV Code, 2021 Edition, Proposed Rule

Code Rulemaking Timeline Publication Year ASME BPV Code ASME OM NRC Proposed Rule NRC Final Rule 2005 2005 Addenda 2006 Addenda 2006 2006 Addenda 2007 2007 Edition 2008 2008 Addenda 2009 2009 Addenda 2009 Edition 2010 2010 Edition 75 FR 24324 (5/4/2010) 2011 2011 Addenda 2011 Addenda 76 FR 36232 (6/21/2011) 2012 2012 Edition 2013 2013 Edition 2014 2015 2015 Edition 2015 Edition 80 FR 56820 (9/18/2015) 2016 2017 2017 Edition 2017 Edition 82 FR 32934 (7/18/2017) 2018 83 FR 56156 (11/9/2018) 2019 2019 Edition 2020 2020 Edition 86 FR 16087 (3/26/2021) 85 FR 26540 (5/4/2020) 2021 2021 Edition 2022 2022 Edition 87 FR 65128 (10/27/22) 2023 88 FR 53384 (8/8/2023) 2024 Target: January 2025 6

Code Case Rulemaking Timeline Publication ASME BPV Code Case Year Supplements NRC Proposed Rule NRC Final Rule RG 1.84 RG 1.147 RG 1.192 2007 0 1 2 3 72 FR 71750 (12/19/2007) Rev. 34 Rev. 15 2008 4 5 6 7 2009 8 9 10 11 0 74 FR 26303 (6/2/2009) 2010 1 2 3 4 75 FR 61321 (10/5/2010) Rev. 35 Rev. 16 2011 5 6 7 8 2012 9 10 11 2013 0 1 2 3 78 FR 37886 (6/24/2013) 2014 4 5 6 7 79 FR 65776 (11/5/2014) Rev. 36 Rev. 17 Rev. 1 2015 0 1 2 3 4 2016 4 6 7 81 FR 10780 (3/2/2016) 2017 0 1 2 3 2018 4 5 6 7 83 FR 40685 (8/16/2018) 83 FR 2331 (1/17/2018) Rev. 37 Rev. 18 Rev. 2 2019 0 1 2 3 4 2020 5 6 7 84 FR 14736 (3/16/2020) Rev. 38 Rev. 19 Rev. 3 2021 0 1 2 3 86 FR 7820 (2/2/2021) 2022 87 FR 11934 (3/3/2022) Rev. 39 Rev. 20 Rev. 4 2023 88 FR 13717 (3/6/2023) 2024 Target date: late 2024 Rev. 40 Rev. 21 Rev. 5 7

ASME Code Case Rule (Revision 39)

  • Final Rule issued March 3, 2022, in Federal Register (87 FR 11934).

8

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.

9

ISI/IST Program COR Interval and Code Case Rule (Rev. 40)

  • November 8, 2021: Commission issued Staff Requirements Memorandum SRM-21-0029 (ML21312A490) approving plan.
  • March 6, 2023: NRC issued proposed rule in 88 FR 13717 for public comment.

10

ISI/IST Program COR Interval and Code Case Rule (Rev. 40)

  • Proposed rule specifies licensees required to update IST/ISI Program COR every two consecutive IST/ISI intervals if licensee implementing 2020 Edition (or later) of OM Code and 2019 Edition (or later) of BPV Code.
  • Proposed rule includes draft RG 1.192, Revision 5, to accept OMN-28, 29, and 30 without conditions, and OMN-31 with condition that IST COR is 2020 Edition or later.
  • NRC staff reviewing public comments on proposed rule.
  • Final rule scheduled to be issued on October 29, 2024.

11

ASME OM Code (2022 Edition)

Proposed Rule

  • On August 8, 2023, NRC issued proposed rule to incorporate by reference in 10 CFR 50.55a the 2022 Edition of OM Code and 2021 Edition of BPV Code for public comment.
  • Proposed rule includes changes to 10 CFR 50.55a to reflect 2022 Edition of OM Code and clarifications.
  • NRC staff reviewing public comments on proposed rule.
  • Final rule scheduled to be issued on January 10, 2025.
  • Specific proposed IST changes indicated on next slides.

12

Proposed New Conditions

- Proposes to clarify when implementing OM Code, Subsection ISTD, paragraph ISTD-4253, and Note 7 of Table ISTD-4252-1 in 2022 Edition of OM Code, licensees are prohibited from applying Code Case OMN-15, Revision 2 or Revision 3, to extend snubber test interval because Section 3.4 of Code Case OMN-15 specifies that OMN-15 shall not be used in conjunction with Code Case OMN-13, which has been incorporated into 2022 Edition of OM Code, Subsection ISTD.

13

Proposed New Conditions

- Proposes to clarify that for each Class 1 Pressure Relief Valve tested per OM Code, Mandatory Appendix I, paragraph I-1320(c)(1), for which as-found set-pressure exceeds plus/minus tolerance limit of Owner-established design set-pressure acceptance criteria of paragraph I-1310(e) or +/- 3% of nameplate set-pressure if Owner has not established design set-pressure acceptance criteria, two additional valves shall be tested from same valve group.

14

Conditions Proposed for Removal

- For 2022 Edition, proposes to remove:

(A) Evaluate MOV test intervals within 5 years or 3 RFOs.

(B) Ensure increase in CDF and LERF acceptably small when extending MOV exercise interval.

(C) MOV risk categorization may use Code Case OMN-3 or NRC-accepted method.

- Conditions (A), (B), and (C) incorporated in 2022 Edition.

- Condition (D) not incorporated in 2022 Edition so applies to all editions.

15

Conditions Proposed for Removal

Check valves

- Proposes to remove (B) for new reactors which requires bi-directional testing of check valves within IST program because new reactors applying recent editions of ASME OM Code.

Flow-induced vibration

- Proposes to remove (C) for new reactors which requires monitoring flow-induced vibration from hydrodynamic loads and acoustic resonance during PST and IST, because addressed by other regulatory requirements during licensing and initial testing program at new power plants.

16

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.
  • Working group will reach out to stakeholders when more information is available.

17

Streamline View YEAR 1 YEAR 2 PROPOSED RULE FINAL RULE Code Editions and Code Editions and Conditioned Code Cases Conditioned Code Cases DIRECT FINAL RULE #1 DIRECT FINAL RULE #2 Unconditioned Code Cases Set #1 Unconditioned Code Cases Set #2 18

EPA decaBDE Ban

  • At MOV Users Group meeting in January 2023, NRC IST staff learned of EPA ban on decaBDE material.
  • NRC vendor staff had been working the issue.
  • NRC staff alerted EPA to potential impact on safe operation of nuclear power plants if EPA ban caused licensees to be unable to repair and replace components with safety functions.
  • EPA issued proposed decaBDE rule revision on November 24, 2023 (88 FR 82287)
  • See NRC Vendor Presentation at public ML23158A084 for more information.

19

ASME OM-2 Code Effort

  • ASME preparing new OM-2 Code for inservice testing of components in new and advanced reactors.
  • Draft OM-2 Code is undergoing ballot review.
  • NRC staff referenced OM-2 Code effort in guidance for risk-informed IST programs for new and advanced reactors.
  • Developers of new and advanced reactors indicated interest in new OM-2 Code for their nuclear power plant applications.
  • Important to have new OM-2 Code available for reference by applicants for new and advanced reactors.

20

ASME QME-1-2023 and reformatted QME-1

  • ASME updated QME-1 Standard in 2023 for qualification of active mechanical equipment in nuclear facilities.
  • ASME preparing reformatted QME-1 standard to be more applicable for new and advanced reactors that might not use water-cooled systems.
  • New reactors (such as AP1000 and NuScale) referenced QME-1 in their applications.
  • Reformatted QME-1 needed by applicants for new and advanced reactors.
  • NRC staff plans to revise RG 1.100 to accept QME-1-2023 and reformatted QME-1 with conditions when available.

21

ASME OM Code, Appendix III Startup 22

ASME OM Code, Appendix III Startup Overview

  • In addition to ASME OM Code requirements, 10 CFR 50.55a(b)(3)(ii) states that licensees must establish a program to ensure that MOVs continue to be capable of performing their design-basis safety functions.
  • 2009 Edition of ASME OM Code includes Appendix III for exercising and periodic diagnostic testing of active MOVs.
  • Many licensees are updating their IST Programs to the 2009 or later editions of ASME OM Code that include Appendix III.
  • Safety-related gate, globe, and butterfly valves with motor operators addressed initially by GL 89-10 and periodically by GL 96-05 programs such that the transition to Appendix III should be straightforward.
  • Safety-related MOVs not diagnostically tested per GL 89-10 and GL 96-05 will have more challenges for Appendix III startup.

23

ASME OM Code, Appendix III Startup Requirements

  • III-3100, Design Basis Verification Tests, requires MOV design-basis verification prior to initiating Appendix III program.
  • III-3200, Preservice Test, requires each MOV shall be tested during preservice test (PST) period or before implementing inservice testing.
  • III-3300, Inservice Test, requires inservice testing shall commence when MOV required to be operable to fulfill its required functions, and shall be sufficient to assess changes in functional margin per III-6000.
  • III-3300(c) requires IST program to include a mix of static and dynamic MOV performance testing.
  • III-3310, Inservice Test Interval, requires IST interval determination to include (a) IST interval determined per III-6440; (b) if insufficient data exist to use III-6400, initial IST interval shall be 2 RFOs or 3 yrs (whichever is longer) until sufficient data exist; and (c) maximum IST interval shall not exceed 10 years.

24

ASME OM Code, Appendix III Startup (continued)

  • MOVs Diagnostically Tested Per GL 89-10/96-05:

- III-3100 for MOV design-basis verification met as part of GL 89-10/96-05

- III-3200 for PST met by diagnostic testing under GL 89-10/96-05.

- III-3300 for IST commencement met by GL 96-05 periodic diagnostic testing if evaluation of margin consistent with III-6000.

- III-3300(c) for mix of static and dynamic testing met if part of Joint Owners Group (JOG) program, and MOV is within JOG scope.

- III-3310 for IST interval met if sufficient test data obtained by GL 96-05 diagnostic testing to demonstrate IST interval per III-6440 with maximum IST interval not exceeding 10 years.

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ASME OM Code, Appendix III Startup (continued)

  • MOVs Not Diagnostically Tested per GL 89-10/96-05:

- III-3100 for design-basis verification must be met for each MOV.

- III-3100(d) indicates engineering evaluation of operating experience may be used to verify design-basis capability for certain valve types (i.e., ball, plug, and diaphragm valves) where need for design-basis verification testing has not been identified.

- III-3200 for diagnostic PST must be met before implementing IST.

- III-3300 for IST commences when MOV required to be operable.

- III-3300(d) requires evaluation of acceptable operating experience for dynamic MOV performance testing to not be required for certain valve types (i.e., ball, plug, and diaphragm valves).

- MOVs not previously diagnostically tested must meet initial IST interval of 2 RFOs or 3 yrs (whichever is longer) required in III-3310(b) until sufficient data exist.

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ASME OM Code, Appendix III Startup Preparation

  • Licensees need to be prepared to implement Appendix III when their Code of Record is updated to 2009 Edition or later of OM Code.
  • Appendix III does not include a grace period for the startup of MOV diagnostic testing.
  • Licensees should contact the NRC Project Manager if concerned about schedule for Appendix III startup to discuss alternative request if needed and justified.
  • NRC staff will consider incorporation of guidance for Appendix III startup in the next revision to NUREG-1482.

27

10 CFR 50.55a(b)(3)(ii)(D)

Scope 28

10 CFR 50.55a(b)(3)(ii)(D)

Scope

MOV stroke time. When applying Paragraph III-3600, MOV Exercising Requirements, of Appendix III to the ASME OM Code, licensees shall verify that the stroke time of MOVs specified in plant technical specifications satisfies assumptions in plant's safety analyses.

  • Federal Register notice (82 FR 32934) dated 7-18-2017 and NRC Response to Public Comments (ML16130A531) discuss this condition.
  • For other MOVs, the licensee will need to review UFSAR to determine if an operating time for the valve is assumed in safety analysis.

29

QUESTIONS?

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Acronyms

  • ASME: American Society of Mechanical Engineers
  • BPV: Boiler and Pressure Vessel
  • BWROG: Boiling Water Reactor Owners Group
  • CDF: core damage frequency
  • CFR: Code of Federal Regulations
  • CIV: containment isolation valve
  • COR: Code of Record
  • decaBDE: Decabromodiphenyl Ether
  • EPRI: Electric Power Research Institute
  • GL: Generic Letter
  • IN: Information Notice
  • IST: inservice testing
  • JOG: Joint Owners Group
  • LOCA: loss of coolant accident
  • MOV: motor-operated valve
  • NRC: U.S. Nuclear Regulatory Commission
  • OM: Operation and Maintenance
  • POV: power-operated valve
  • PPM: Performance Prediction Methodology
  • PST: preservice testing
  • RG: Regulatory Guide
  • UFSAR: Updated Final Analysis Report 31
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