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NEI-19-03-Rev. 1 Advanced Reactor Codes and Standards Needs Assessment
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Site:	Nuclear Energy Institute
Issue date:	03/31/2020
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	Robert Roche-Rivera
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NEI 19-03, [Rev 1]

Advanced Reactor Codes and Standards Needs Assessment Prepared by the Nuclear Energy Institute March 2020 Rev 1

March 2020 Acknowledgements This document was developed by the Nuclear Energy Institute. NEI acknowledges and appreciates the contributions of NEI members and other organizations in providing input, reviewing and commenting on the document.

NEI Project Lead: Mike Tschiltz, Senior Director, New Reactors Notice Neither NEI, nor any of its employees, members, supporting organizations, contractors, or consultants make any warranty, expressed or implied, or assume any legal responsibility for the accuracy or completeness of, or assume any liability for damages resulting from any use of, any information apparatus, methods, or process disclosed in this report or that such may not infringe privately owned rights.

March 2020 Executive Summary The future of nuclear power in the United States and the re-establishment of U.S. global leadership in nuclear energy depends, in part, on the successful deployment of new and advanced reactor designs.

Currently, over thirty U.S. companies are actively developing advanced designs that differ markedly from the light water reactors (LWRs) operating in the U.S. today. For these designs to be deployed commercially in the U.S., they must be approved by the Nuclear Regulatory Commission (NRC). Because the NRCs regulatory process is light water reactor-focused, modifications to the existing regulatory and technical guidance are needed to support the timely and efficient licensing of advanced technologies.

The NRCs regulatory processes for LWRs and the associated rules, regulatory and industry guidance documents, and codes and standards have been developed over the past 50 years. Near term development of a similar infrastructure to support the design, licensing and deployment of advanced reactors within the timelines is not realistic. Designers are able to move forward to complete their designs and license applications utilizing existing codes and standards with design specific analysis and justification. However, efficiencies can be achieved through the development of additional codes and standards applicable to advanced reactors.

The purpose of this document is to identify codes and standards that could provide the greatest benefit for the advanced reactor design types being developed today, and to prioritize them so that the most beneficial codes and standards are developed first. Prioritization is based on the benefit to potential NRC applicants in terms of facilitating the licensing process and reducing design, component fabrication, facility construction and plant operating costs. Prior activities by the Oak Ridge National Laboratory (ORNL), American Nuclear Society (ANS) and NRC identified technical areas that warrant additional research and development to support standards development activities and a lengthy list of standards that need levels of revision to support the deployment of advanced reactors. Building on those activities, the tables contained herein list prioritized codes and standards and include descriptions of their content to explain the rationale of the specific changes needed to facilitate application to advanced reactors.

In developing the lists, over 800 codes and standards were identified. Of these, 18 have been evaluated as high priority with the potential to provide the greatest benefit for near term development. This list is summarized in Appendix A. The high priority codes and standards are listed in no particular order. To enable progress on development of these codes and standards in the near term, support from the federal government through the Department of Energy (DOE) and the NRC is needed.

March 2020 Table of Contents List of Abbreviations ..................................................................................................................................... 5 1 Overview .......................................................................................................................................... 6 2 Background ...................................................................................................................................... 6 3 Objectives ........................................................................................................................................ 7 4 Prioritized List of Codes and Standards Needs ................................................................................ 7 4.1 DOE-sponsored Review of Applicable Codes and Standards.............................................. 7 4.2 Prioritization of Research and Development Needs........................................................... 8 4.3 Prioritization of Non-LWR related Codes and Standards Development Needs................ 11 5 Schedule ......................................................................................................................................... 21 6 Conclusions and recommendations for path forward ................................................................... 22 7 References ..................................................................................................................................... 23 Appendix A: Highest Priority Codes and Standards for Near-Term Deployment

March 2020 LIST OF ABBREVIATIONS ACI American Concrete Institute ANS American Nuclear Society ANSI American National Standards Institute ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials BPVC Boiler and Pressure Vessel Code DOE Department of Energy GAIN Gateway for Accelerated Innovation in Nuclear HTGR High Temperature Gas Reactor IEEE Institute of Electrical and Electronics Engineers ISA International Society of Automation JCNRM ANS/ASME Joint Committee on Nuclear Risk Management LMFR Liquid Metal Fast Reactor LWR Light Water Reactor MSR Molten Salt Reactor NEI Nuclear Energy Institute NFPA National Fire Protection Association NIA Nuclear Innovation Alliance NRC Nuclear Regulatory Commission ORNL Oak Ridge National Laboratory RG Regulatory Guide SDO Standards Development Organization SFR Sodium Fast Reactor

March 2020 1 OVERVIEW The future of nuclear power in the U.S. and the re-establishment of U.S. global leadership in nuclear energy will require the successful deployment of new and advanced reactor designs. Currently, there are numerous U.S. companies engaged in advanced reactor design development activities. These designs offer safety enhancements by designing out the potential for many types of accident scenarios that challenge existing LWRs and by using passive safety features that do not rely on alternating current or direct current power. The designs being developed are significantly different from the large LWRs in operation in the U.S. today in that they use coolants such as helium, liquid metal, and molten salts, and operate at much higher temperatures.

To realize the benefits of enhanced economic viability and safety, these advanced reactor designs must first be demonstrated to have enhanced safety and obtain Nuclear Regulatory Commission (NRC) approval. NRCs existing regulatory processes are focused on large LWR technology. Changes are being developed to support the licensing of advanced non-LWRs. NRC, the Department of Energy (DOE) through the National Laboratories, the Nuclear Energy Institute (NEI), the Nuclear Innovation Alliance (NIA) and the standards development organizations (SDOs) have begun work to facilitate the development of the technical and licensing infrastructure for advanced non-LWRs.

Because the domestic and international deployment of advanced reactors depends on economic viability as well as the robustness of the safety of the design, additional codes and standards will help minimize unnecessary conservatism in the designs and will help make the regulatory process more timely, efficient and certain.

The purpose of this document is to identify and prioritize the codes and standards that should be developed or modified to facilitate the deployment of advanced reactors. To help explain the rationale behind the needed change, the subject matter for each guidance document, rule, or code and standard is described.

2 BACKGROUND Consensus codes and standards have been employed in the design, licensing, construction and operation of commercial nuclear power plants since the first demonstration plants were built and operated. The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC) provided the design criteria for the reactor pressure boundary and listed materials suitable for the fabrication of pressure boundary components, building on experience gained with power boilers and naval reactor components. The early design criteria were very conservative to address the level of sophistication in the available analysis tools and the experiences with power boilers. Over time, as analysis methods improved and construction methods evolved, the Code endorsed the more sophisticated analysis and construction methods and reduced the conservatisms necessary to maintain margins of safety that were required.

The ASME BPVC is one key example of consensus standards used by the nuclear industry and endorsed by the Nuclear Regulatory Commission through regulation or regulatory guidance. However, consensus standards from a wide range of consensus standards bodies are routinely used by the industry and the NRC in ensuring the safe design, construction and operation of commercial nuclear power facilities. The subjects addressed by these standards include virtually every aspect of plant safety, and the standards development organizations involved with the development and promulgation of these standards include ASME, ASCE, ACI, ANS, ASTM, IEEE, ISA and NFPA, just to mention a few of the key organizations.

March 2020 The standards organizations involve members representing a balance of interests including designers, operators, suppliers, construction organizations, consultants and government organizations. This ensures that the standards reflect interests from all relevant organizations and are not dominated by a single party.

Consensus standards that are developed or revised to address advanced reactor technologies can provide significant support to the design and licensing of advanced reactors, and support component fabrication, facility construction and eventual facility operation.

3 OBJECTIVES The overall objective of this document is to identify the advanced reactor codes and standards that could be the most beneficial for supporting the design, licensing, construction and operation of advanced reactors. The assessment is technology-inclusive, so it can be applicable to all designs being developed by advanced reactor vendors. The results of this assessment should be helpful in the prioritization and scheduling of the development of key standards that could be most beneficial to advanced reactor developers.

4 PRIORITIZED LIST OF CODES AND STANDARDS NEEDS 4.1 DOE-sponsored Review of Applicable Codes and Standards Since all commercial nuclear power plants in operation today in the U.S. are LWR designs, the regulatory infrastructure of rules, regulatory guidance and policy is currently focused on LWRs. Consensus codes and standards are endorsed in NRCs regulations and in Regulatory Guides (RGs) and play a key role in the LWR regulatory infrastructure. These consensus codes and standards are developed and maintained by standards development organizations, such as ASME and the Institute of Electrical and Electronics Engineers (IEEE). Since the codes and standards are also LWR focused, many do not apply to non-LWR technologies. To understand the magnitude and scope of work required to establish codes and standards for advanced reactors, the Oak Ridge National Laboratory (ORNL) under DOE funding performed a scoping study focused on codes and standards for SFRs that provided [35]:

1. An estimate of the number of standards that need revision;

2. An estimate of the levels of effort required to revise those standards;

3. A description of the process for revising or creating a new standard; and

4. A description of the NRCs process for endorsing a standard.

The first step in estimating the magnitude and scope of the effort was to obtain a list of all standards cited in Regulatory Guides. This step identified 865 standards.

The second step was to narrow the number of standards for an in-depth review to assess their potential application to SFRs. This step identified 114 standards; however, the 43 standards from the IEEE were reviewed separately because they were expected to be technology neutral (this assumption was confirmed by a separate review). Of the remaining 71 standards, 11 were duplicates, leaving 60 standards for detailed review.

March 2020 The third step was to review the 60 standards with respect to their applicability to SFRs and to identify the need for new standards unique to SFRs. This step identified 12 potential new standards that would be design specific. Of the 60 standards endorsed by RGs, 46 were voluntary consensus standards and 14 were initiated by the nuclear industry. Of the 46 consensus standards 17 will not require any changes. Of the remaining standards, 13 will require limited changes, 13 will require significant changes, and 3 lacked sufficient information to assess their applicability. Since this review focused on codes and standards needed for SFRs alone, it is clear that a substantial level of effort is needed by the SDOs, nuclear industry and the NRC to support the development and endorsement of the full range of codes and standards that would be beneficial to all advanced reactor designs.

4.2 Prioritization of Research and Development Needs During the May 2, 2018 ANS /NRC Workshop to Develop a Strategic Vision for Advanced Reactor Standards, technology working groups identified the top technical areas for continued research and development. Additionally, the need for development or revision of six consensus standards was identified beyond those identified in the ORNL review. The technical areas where the need for continued R&D was identified are summarized in Table 1.

Table 1. Top Technical Areas for R&D by Technology Technology Technical Area / Issues to be Addressed Lead Organization ASME Sections III and VIII cyclic loads for high temperature design.

For example, metallic reactor core support structures typically may be exposed to temperatures in excess of 500°C (930°F) in normal operation, with short-term excursions to 670°C (1240°F) [39]. Alloy 800H core support components may be exposed long-term to 800 to 850°C (1472 to 1562°F) for some types of reactors. Other components, such as compact heat exchangers, may see normal operating temperatures in local areas up to 850°C (1560°F), with short-term excursions to 900°C (1650°F).

DOE/Vendor/GAIN HTGR 1. Develop initial loading and cyclic stress-strain curves for all Vouchers materials to be used for BPV III-5 and VIII construction for the complete temperature range of interest if these data are needed for the analysis methods selected.

2. Develop improved design methodology for creep-fatigue evaluation by analysis. This approach should take full advantage of modern analysis tools, such as elastic-plastic finite element analysis with creep strain capability. Note that R&D is recommended to develop the necessary material models.

Fiber optic (specifically) and qualification of instrumentation and HTGR DOE/Vendor control (I&C) for high temperatures in general: For example [40],

March 2020 Technology Technical Area / Issues to be Addressed Lead Organization

1. No temperature sensors currently available to measure the pebble temperature distribution in the core directly in pebble bed reactors.

2. Distributed fiber-optic Bragg thermometry is susceptible to photo-bleaching in high radiation, high temperature environments.

3. No suitable in-core neutron flux measurement sensor is commercially available that functions reliably at temperatures above ~550°C.

ASME Section XI high-temperature ISI: For example, identify non-destructive examination (NDE) technologies of advanced Vendor/GAIN HTGR monitoring, diagnostics and prognostics systems (e.g., acoustic Voucher emission, ultrasonic, advanced material characterization) applicable to components of HTGRs for in-service inspection [41].

Structural alloys, cladding and coating materials for the temperature ranges and fluences of interest: Qualification of LMFR, other metallic materials for advanced high-temperature and high fast DOE fast reactors flux applications is to be based on creep behavior, fatigue properties, structural stability and corrosion resistance.

Concrete considerations at high temperature and fluence: Higher fluence may have detrimental effects on concrete compressive LMFR, other and tensile strength and modulus of elasticity. For example, for DOE fast reactors fast neutron fluence between 7 x 1018 and 3 x 1019 n/cm2 the modulus of irradiated concrete was between 10% and 20% less than that of non-irradiated unheated concrete [42].

I&C - Spectral, material, temperature, and lifetime considerations:

For example, a neutron flux monitoring system is required to provide measurements that aid in reactor start-up and enable efficient plant control, to monitor reactivity changes, and to detect LMFR, other DOE/Vendor/GAIN reactor abnormal conditions. The overall neutron flux varies by 12-fast reactors Voucher 14 orders of magnitude from reactor shutdown to full-power operation conditions. R&D is needed to design and test the neutron flux monitoring system in a high-temperature sodium environment [43].

Fuel and material handling variations: For example, for LMFR fuel LMFR, other transportation, loading, unloading, storage, and cleaning, the fuel Vendor/GAIN fast reactors handling system consists of the rotational plug, in-vessel fuel Vouchers handling machine, ex-vessel fuel transportation device, in-vessel storage or/and ex-vessel interim storage, fuel cleaning station, etc.

March 2020 Technology Technical Area / Issues to be Addressed Lead Organization Even though fuel handling experience was developed at the previously operated fast reactors both domestically and internationally, each fuel handling system is tailored for the specific geometry of the plant and there is no standard design for fuel handling systems [43].

Decay heat: A standard that differs from ANSI/ANS 5.1-1979 LWR LMFR, other decay heat curve is needed to address fast spectrums, different DOE/Vendor/GAIN fast reactors coolants, fuel management practices including conversion ratios, Vouchers and fuel configurations.

Material options (metallic, graphite, etc.) for core components in a high fast neutron flux environment: For example, the advanced austenitic stainless steel alloy 709 has been under development for a number of years and is currently being code-qualified as a replacement material for the 300-series austenitic stainless steels MSR (304, 316). The advanced ferritic-martensitic stainless steel DOE modified 9Cr-1Mo has a significant strength advantage over the low-chrome ferritic steel Fe-214Cr-1Mo and can be used, with some additional R&D, as a construction material for a 60-year, non-replaceable steam generator design, and it can also be considered as a candidate material for an IHX design with a full 60-year design life [43].

Design, materials, and fabrication of structural components clad or lined with corrosion-resistant materials: For example, alloys high in iron and chromium such as inconel 106 and type 316 stainless DOE/Vendor/GAIN MSR corrode readily and lose significant amounts of mass within a few vouchers thousand hours [44]. Alloys with high nickel, molybdenum, niobium and silicon show better corrosion resistance [45].

Refractory alloys: welding, fabrication and joining techniques, and DOE/Vendor/GAIN MSR better understanding of embrittlement and fracture behavior are vouchers needed.

In general, additional material options such as high strength nickel alloys are needed to broaden the approved material choices for All designs DOE/Vendors high temperature structural applications in many advanced reactor designs.

March 2020 4.3 Prioritization of Non-LWR related Codes and Standards Development Needs Given the large number of codes and standards identified by ORNL and in the ANS/NRC workshop that need to be developed or revised for advanced reactors, they were prioritized based on the criteria discussed below.

Criteria utilized to rank importance include:

1. Standard will support design efforts;

2. Standard will support licensing review;

3. Standard will reduce component fabrication time and costs;

4. Standard will reduce facility construction time and costs; and

5. Standard will reduce O&M costs.

Standards were then scored to determine priority based on the following:

1. Standards that (1) support design and licensing, (2) support either design or licensing and at least two other criteria, or (3) standards where three of the other criteria are satisfied, were ranked as High.

2. Standards that satisfied two of the criteria not specifically related to design or licensing were ranked as Medium.

3. Standards that satisfied one of the criteria not specifically related to design or licensing were ranked as Low.

Table 2 summarizes the codes and standards identified in the ORNL and ANS/NRC activities that are affected along with a proposed prioritization. The numbers in the priority column relate to the relevant ranking criteria. A total of 36 standards are included in the table, which includes new standards on advanced manufacturing methods that were not identified by either ORNL or ANS/NRC.

Table 2. Prioritization of Codes and Standards Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change This standard would contain methods and data Equivalent to needed to calculate the concrete thickness ANSI/ANS 6.4-2006, High required for radiation shielding in advanced New /

Concrete for Passive nuclear power plants. Specific recommendations substantive ANS Heat Removal Systems 1,2,4 are to be made regarding radiation attenuation effort

- Irradiation and calculations, shielding design and standards of Thermal Limits documentation. The standard would provide guidance to architect-engineers, utilities and

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change reactor vendors who are responsible for the shielding design of advanced reactor designs.

Equivalent to ASME This standard would describe the requirements QME-1, Qualification and guideline for qualifying passive mechanical of Passive Equipment equipment, such as valves not requiring external motive force, used in many advanced reactors.

Medium NOTE: This standard The requirements and guidelines would include New /

was identified in the the principles, procedures, and methods of substantive ASME 2,3 ORNL report, Section qualification. effort 4.3, but was not included in standards listed in Appendix A of that report.

ANS-30.1-201x Risk- This standard describes the objectives of High informed incorporating risk-informed and performance-New / on-Performance-based based (RIPB) information into the safety design ANS going 1,2 Principles and of advanced reactors. This standard will Methods demonstrate high-level uses of RIPB methods.

ANS-30.2-201x This standard provides a single technology Categorization and neutral categorization and classification process High classification of SSCs for SSCs for advanced reactors that is, where possible, RIPB. This process will then be used to New / on-1,2,5 ANS determine special treatment of SSCs to meet the going safety basis. It would provide a complete (i.e.,

necessary and sufficient) repeatable logical process based upon RIPB objectives.

ANS-20.1-201x, This standard will establish the nuclear safety Not Nuclear Safety Criteria criteria, and design requirements for the rated. and Design Criteria for fluoride salt-cooled high-temperature reactor This Fluoride Salt-cooled nuclear power plants. RIPB criteria are used New ANS standard High-temperature wherever possible. It describes the design is on Reactors process to be followed to establish those criteria hold. and perform structures, systems, and component classifications.

High ANSI/ANS 53.1, This standard provides a process for establishing Nuclear Safety Design top-level safety criteria; safety functions; top-1,2,5 Process for Modular level design criteria; licensing-basis events; Limited ANS Helium-Cooled Reactor design-basis accidents; safety classification of Plants, 2011 systems, structures and components (SSCs);

safety analyses; defense-in-depth; and adequate

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change assurance of special treatment requirements for safety-related SSCs throughout the operating life of the plant. The standard does not provide detailed guidance for design; other standards cover that.

ANS-20.2 Nuclear This standard establishes the nuclear safety Safety Design Criteria design criteria and functional performance and Functional requirements for liquid-fuel molten-salt reactor Medium Performance nuclear power plants. The document uses RIPB New / on-ANS Requirements for criteria wherever possible. It also describes the going 1

Liquid-Fuel Molten- design process to be followed to establish those Salt Reactor Nuclear criteria and perform SSC classifications. This Power Plants standard has been drafted.

ASME/ANS RA-S-1.4- This standard establishes requirements for a 2013 PRA for Non- PRA for advanced non-light water reactor LWRs (trial use) nuclear power plants. The requirements in this standard were developed for a broad range of High PRA scopes including operating states, hazard types, and different end states. This standard Finalize ASME/ANS 1,2 has been issued for trial use and has been subjected to many trial use applications. Lessons learned from the trial use and other parallel activities are currently being used by the JCNRM to provide an update for ANS status in 2020.

ASME BPVC Division 1 Changes are necessary to reflect functional and 2, Subsection NCA, containment concept. For example, the Containment Barrier containment barrier is essentially leak-tight rather than an effective barrier to describe High the containment function for concepts that may rely on acceptable design condition leak rates. Substantive ASME 1,2,4 The rules of Subsection NCA constitute requirements for the design, construction, stamping and overpressure protection of items used in nuclear power plants and other nuclear facilities.

Medium ANSI/ISA-67.02.01- For advanced reactor designs, pressure and level 2014, Safety-related measurements may use different technologies 1 Instrument Sensing or apply existing technology in a different Substantive ISA Lines manner. Pressure measurements may use impulse lines, bubblers, or use direct measurement sensors. Level measurements may

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change use guided-wave microwave, guided-wave ultrasonic, or heated lance. Temperature alone will require changes to the methodology for pressure and level measurements. Sodium presents problems with visibility and does not boil which will eliminate some measurement techniques. Advanced reactors may also use optical sensors.

ASME BPVC Section XI, This Section contains Division 1, Rules for In-service Inspection of Inservice Inspection of Nuclear Power Plant Components Components, Division 1, Rules for Inspection and Testing of Components of Light-Water-Cooled Low Plants and Division 2 Rules for Inservice Inspection of Nuclear Power Plant Components, Limited ASME 5 Division 2, Requirements for Reliability and Integrity Management (RIM) Programs for Nuclear Power Plants. Some adaptation of flaw evaluation requirements to advanced reactors may be necessary.

New standards A new standard will be required to define equivalent to SFR-DC 73 for sodium leak 1. the means to detect sodium leakage into detection and inert or air environments, mitigation (RG 1.232) 2. the extent to which sodium-air and sodium-High concrete reactions are limited and controlled, New ANS 1,2

3. the degree to which the effects of fires are mitigated, and

4. the means for evaluating the effectiveness of special features or conditions containing sodium to ensure that the safety functions of SSCs important to safety are maintained.

ANS 56.2-1984 (ANSI This standard specifies minimum design, N271-1976), actuation, testing, and maintenance Containment Isolation requirements for the containment isolation of for Fluid Systems fluid systems after a LOCA in LWRs. These fluid High systems penetrate the primary containment and Substantive ANS include piping systems (including 1,2,5 instrumentation and control) for all fluids entering or leaving the containment. Electrical systems are not included. The provisions for containment isolation impose additional requirements which are not required for the

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change fluid system function. Changes are necessary to address the varied advanced reactor designs, coolants as well as functional containment concepts.

ASME AG-1-2009, Air This standard considers the design, fabrication, and Gas Treatment inspection and testing of air cleaning and High conditioning components and appurtenances used in safety-related systems in nuclear Substantive ASME 1,2,3,5 facilities. Changes are necessary to address the varied advanced reactor designs as well as functional containment concepts.

ASME BPVC Section III, This Section contains requirements for the Construction of plant material, design, fabrication, and examination of components supports which are intended to conform to the requirements for Classes 1, 2, 3, and metal containment construction. Nuclear power plant High supports for which rules are specified in this Subsection are those metal supports which are Substantive ASME 1,2,3 designed to transmit loads from the pressure retaining barrier of the component or piping to the load carrying building structure. Changes are necessary to address the varied advanced reactor designs as well as functional containment concepts.

New Standards for Additive manufacturing offers a new paradigm Advanced for engineering design and manufacturing by Manufacturing enabling unique macro-structural design of Techniques, including components and micro/nano-structural design Additive of the material. There is a need to develop and High Manufacturing publish standards applicable to the New ASME 1,2,3 manufacturing of components suitable for use in NOTE: These types of safety-related and other plant applications.

standards were not included in either the ORNL report or the ANS/NRC summary. 1 ASME BPVC Section III Subsection NE pertains to Class MC components High Substantive ASME Division 1, Subsection while Division 2 pertains to concrete reactor vessels and containments. Changes are 1 An NEI report was issued on May 13, 2019 entitled Roadmap for Regulatory Acceptance of Advanced Manufacturing Methods in the Nuclear Energy Industry. The report identified the high priority manufacturing methods of greatest interest to the industry in the next 5 years.

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change 1,2,4 NE, and Division 2, necessary to address the varied advanced Containment reactor designs as well as functional containment concepts. Updates should consider including steel-plate composite (SC) construction for containment structures. Note that AISC N690 allows for SC walls for safety-related structures other than containment.

ASME BPVC Section III, There are various activities being undertaken Division 5, High and on-going to supplement Division 5. Activities Temperature Reactors such as extending the qualified lifetimes of Class A materials to support a 60-year design life, qualification of additional materials, High development of analysis methods to simplify the Division 5 design analyses, development of On-going ASME 1,2 design rules for integrally cladded components with weld overlay on Class A materials to support molten salt reactor applications, incorporation of graphite irradiation data to support graphite design rules, and incorporation of ceramic composite design rules.

ASME N509-2002, Air This standard covers requirements for the Cleaning Units and design, construction, and qualification and Components acceptance testing of the air-cleaning units and components which make up Engineered Safety Feature (ESF) and other high efficiency air and gas treatment systems used in nuclear power High plants. The standard does not cover sizing of a Substantive ASME complete nuclear air treatment system, 1,2,4 redundancy, or single-failure requirements. It applies only to systems which employ particulate filtration, ambient-temperature adsorption, or both, as the principal functional mechanism. Changes are necessary to address the varied advanced reactor designs.

ASME QME-1-2007, This standard describes the requirements and Qualification of Active guideline for qualifying active mechanical High Mechanical equipment, such as pumps, valves, and dynamic Substantive ASME Components restraints, used in nuclear facilities. The 1,2,3 requirements and guidelines presented include the principles, procedures, and methods of qualification. Changes are necessary to address

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change the varied advanced reactor design components and high temperature applications.

ASTM D3911-16, Test This test method is designed to provide a Method for Evaluating uniform test to determine the suitability of Coatings Coating Service Level 1 coatings used inside primary containment of LWR facilities under simulated design basis accident (DBA) conditions. This test method is intended only to demonstrate that under DBA conditions, the Low coatings will remain intact and not form debris which could unacceptably compromise the Substantive ASTM 4 operability of engineered safety systems.

Deviations in actual surface preparation and in application and curing of the coating materials from qualification test parameters require an engineering evaluation to determine if additional testing is required. Changes are necessary to address the varied advanced reactor design SSCs and coating applications.

ASTM D7491-08, This guide provides the user with guidance on Management of Non- developing a program for managing non-conforming Coatings conforming coatings in Coating Service Level I areas of a nuclear power plant. Non-conforming Low coatings include degraded previously DBA-Substantive ASTM qualified or acceptable coatings, unqualified 4

coatings, unknown coatings, and unacceptable coatings. Changes are necessary to address the varied advanced reactor design SSCs and coating applications.

NFPA 251, Methods of This standard specifies methods for determining Tests of Fire Resistance the fire-resistive abilities of building members of Building and assemblies, including tests of:

Construction and Materials 1. Bearing and nonbearing walls and partitions High 2. Columns Substantive NFPA

3. Floor and roof assemblies 1,2,4

4. Loaded restrained beams

5. Performance of protective membranes in wall, partition, floor, or roof assemblies.

Changes are necessary to address the varied advanced reactor design SSCs.

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change ACI 349.1R-07, This standard provides general considerations in Reinforced Concrete designing reinforced concrete structures for Design for Thermal nuclear power plants subject to thermal effects.

Effects Thermal effects are defined to be the exposure of a structure or component thereof to varying temperature at its surface or temperature gradient through its cross section; the resulting High response of the exposed structure is a function of its age and moisture content, temperature Limited ACI 1,2,4 extreme(s), duration of exposure, and degree of restraint. The terms force, moment, and stress apply and are used in this report where a structure is restrained against thermally induced movements. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ACI 349-2013, Nuclear This Code provides minimum requirements for Safety-related design and construction of nuclear safety-Concrete Structures related concrete structures and structural and Structural members for nuclear facilities. Safety-related Members structures and structural members subject to this Code are those concrete structures that support, house, or protect nuclear safety class High systems or component parts of nuclear safety class systems. Specifically excluded from this Limited ACI 1,2,4 Code are those structures covered by Code for Concrete Containments, ASME Boiler and Pressure Vessel Code Section III, Division 2, and pertinent General Requirements (ACI 359).

Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ANSI/ANS 3.1-2014, This standard provides criteria for the selection, Selection, Qualification qualification, and training of personnel for and Training of nuclear power plants. The qualifications of Low Personnel personnel in the operating organizations Limited ANS appropriate to safe and efficient operation of a 2

nuclear power plant are addressed in terms of the minimum education, experience and training requirements. Limited changes are necessary mostly to address specific language in the

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change standard so as to be applicable to the varied advanced reactor designs.

ANSI/ANS 3.2-2012, This standard provides requirements and Managerial and recommendations for managerial and Administrative administrative controls to ensure that activities Controls associated with operating a nuclear power plant are carried out without undue risk to the health Low and safety of the public. This standard provides Limited ANS requirements for implementing managerial and 2

administrative controls consistent with requirements of 10 CFR 50, Appendix B. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ANSI/ANS 3.4-1996, This standard defines the physical and mental Physical and Mental requirements in order to be licensed as a Health Requirements nuclear reactor operator. It also addresses the Low for Reactor Operators content, extent, and methods of examination.

Limited ANS and Senior Operators Limited changes are necessary mostly to address 2

specific language in the standard so as to be applicable to the varied advanced reactor designs.

ANSI/ANS 3.5-2009, This standard establishes the functional Plant Simulators for requirements for full-scope nuclear power plant Use in Operator control room simulators for use in operator Training and training and examination. The standard also Low Examination establishes criteria for the scope of simulation, Limited ANS performance, and functional capabilities of 2

simulators. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ANSI/ANS 6.3.1-1987 This standard defines calculational requirements (R2007), Testing and discusses measurement techniques for Radiation Shields estimates of dose rates near LWR nuclear power Medium plants due to direct and scattered gamma rays Limited ANS from contained sources on-site. On-site 1,2 locations outside plant buildings and locations in the off-site unrestricted area are considered.

The requirements for measurements and data interpretation of measurements are given. The

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change standard includes normal operation and shutdown conditions but does not address accident or normal operational transient conditions. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ASME N510-2007, This standard provides a basis for the Testing of Air- development of test programs for air-treatment treatment Systems systems and does not include acceptance criteria except where the results of one test Low influence the performance of other tests.

Acceptance criteria shall be developed based on Limited ASME 4 the design/function in accordance with ASME N509. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ASME N511-2007, In- This standard covers the requirements for in-service Testing of service testing of nuclear safety-related air Low HVAC Systems treatment, heating, ventilating and air conditioning systems in nuclear facilities. Limited Limited ASME 5 changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ASTM D4286-08, This document provides a criteria guide and Coating Contractor procedural method to assist utility owners, Qualifications architects, engineers, constructors and other selection agencies in determining the overall qualifications of a coating contractor to execute Low coating work for the primary containment and other safety-related facilities of LWRs. The Limited ASTM 4 qualification criteria and requirements address the essential basic capability of a contractor to execute nuclear coating work. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

March 2020 Description of Content and Issues to be Type of Priority Standard/Guidance Organization Addressed for Advanced Reactors Change ASTM D4538-05, This terminology covers terms and their Terminology for definitions relevant to the use of protective Low Protective Coatings coatings in nuclear power plants. Limited Limited ASTM changes are necessary mostly to address specific 4

language in the standard so as to be applicable to the varied advanced reactor designs.

ASTM D5144-08, Use This document covers coating work on of Protective Coatings previously coated surfaces as well as bare substrates. This guide applies to all coating work Low in Coating Service Level I and III areas (that is, Limited ASTM safety-related coating work). Limited changes 5

are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

ASTM D7167-05, This document covers procedures for Monitoring establishing a program to monitor the Performance of Safety- performance of Coating Service Level III lining related Coatings (and coating) systems in operating nuclear Low power plants. Monitoring is an ongoing process Limited ASTM of evaluating the condition of the in-service 5

lining systems. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

5 SCHEDULE DOE, with stakeholder input, has developed a vision and goal for supporting the development and ultimate deployment of advanced reactor technology as part of a broader federal commitment to energy security, economic prosperity and national security. The vision is that by 2050, advanced reactors will provide a significant and growing component of the nuclear energy mix both domestically and globally. In support of this, a goal has been established that by the early 2030s, at least two non-light water advanced reactor concepts will have reached technical maturity, demonstrated safety and economic benefits, and completed licensing reviews sufficient to allow construction to commence [36].

In the time since DOEs vision and goal was established a greater sense of urgency for being able to utilize advanced reactors has emerged. As a result, efforts are focused on accelerating activities to support non-light water demonstrations in the 2020s which increases the importance of prioritizing and coordinating codes and standards development efforts.

Codes and standards should be developed by the various standards development organizations and endorsed by the NRC in a phased manner based on the prioritization discussed in Section 4 of this report. If not already commenced, the highest priority activities should begin as soon as resources can

March 2020 be provided. Work on the lower priority items can be done in later phases, depending on available resources. It is clear from the number of codes and standards identified in this report that a great deal of work remains to be completed to help assure the efficient design, licensing, construction and operation of advanced reactors.

6 CONCLUSIONS AND RECOMMENDATIONS FOR PATH FORWARD Given the large number of codes and standards identified as needing to be developed or revised to accommodate advanced non-LWRs, it is recommended that industry and federal government resources be focused on those that are the highest priority to near-term deployment of the advanced reactor designs. Table 2 provides a prioritized list of the relevant codes and standards that should be addressed to support the deployment of advanced reactors in the U.S.

Consensus standards organizations are voluntary activities and the pace of activities is generally dictated by the availability of the participants. Additionally, often R&D is needed to provide the technical basis for the code development or revision. Coordination, prioritization and funding for these activities can be difficult and even when funding is obtained, the pace of the R&D can be dictated by the level of available funding.

It is recommended that public-private partnerships be formed to provide financial support for those situations where R&D or other special needs is essential to developing or revising codes and standards on a schedule that supports the deployment of advanced reactors.

Figure 1 illustrates a process under which public-private partnerships would engage SDOs to support their activities in developing or revising codes and standards.

Figure 1. Consensus Standards Funding Process

March 2020 Consensus codes and standards have been an important contributor to the design, licensing, component fabrication, facility construction, and operation for the existing fleet of operating reactors and for new LWRs. It is anticipated that they will make similar contributions to the deployment of advanced reactor technologies. Providing adequate support to timely development and revision of these standards is expected to facilitate the deployment of these important new technologies.

7 REFERENCES In addition to providing reference information for specific citations in the report, the following list of references provide useful information related advanced reactors and plans by government and industry for development and deployment of those technologies.

1. U.S. Department of Energy, Modernization of Technical Requirements for Licensing of Advanced Non-Light Water Reactors, Selection of Licensing Basis Events, Draft Report Revision 0.

2. U.S. Department of Energy, Modernization of Technical Requirements for Licensing of Advanced Non-Light Water Reactors, Probabilistic Risk Assessment Approach, Draft Report Revision 0, May 2017.

3. U.S. Department of Energy, Modernization of Technical Requirements for Licensing of Advanced Non-Light Water Reactors Safety Classification and Performance Criteria for Structures, Systems and Components, Draft Report Revision A, June 2017

4. 10 CFR 50, Appendix A, General Design Criteria for Nuclear Power Plants, Code of Federal Regulations, Office of the Federal Register, 2007

5. 10 CFR 50.2 Definitions, 12/2/15

6. 10 CFR 52.1, Licenses, Certifications, and Approvals for Nuclear Power Plants - Definitions, 2015

7. 51 FR 149, Safety Goals for the Operations of Nuclear Power Plants; Policy Statement, Federal Register, U.S. Nuclear Regulatory Commission, August 4, 1986, pp. 28044-28049, (51 FR 160, republished with corrections, August 21, 1986, pg. 30028-30023)

8. 59 FR 35461, Regulation of Advanced Nuclear Power Plants; Statement of Policy, Federal Register, U.S. Nuclear Regulatory Commission, July 12, 1994

9. 60 FR 158, Use of Probabilistic Risk Assessment Methods in Nuclear Regulatory Activities; Final Policy Statement, Federal Register, U.S. Nuclear Regulatory Commission, August 16, 1995, pp.

42622-42629

10. ACRS Letter,

Subject:

Next Generation Nuclear Plant (NGNP) Key Licensing Issues, May 15, 2013

11. American Society of Mechanical Engineers and American Nuclear Society, Standard for Probabilistic Risk Assessment for Nuclear Power Plant Applications, ASME-RA-Sb-2013

12. American Society of Mechanical Engineers and American Nuclear Society, Probabilistic Risk Assessment Standard for Advanced non-LWR Nuclear Power Plants, RA-S-1.4-2013

13. Idaho National Laboratory, Next Generation Nuclear Plant Defense-in-Depth Approach, INL/EXT 09-17139, December 2009, [ADAMS Accession No. ML093480191]

14. NRC to ACRS Letter,

Subject:

Response to Advisory Committee on Reactor Safeguards Regarding Staff Assessment of Next Generation Nuclear Plant Key Licensing Issues, June 20, 2013

March 2020

15. NUREG-1860, Feasibility Study for a Risk-Informed and Performance-Based Regulatory Structure for Future Plant Licensing, U.S. Nuclear Regulatory Commission, December 2007

16. NUREG-2150, A Proposed Risk Management Regulatory Framework, U.S. Nuclear Regulatory Commission, April 2012

17. SECY 2003-0047, Policy Issues Related to Licensing Non-Light Water Reactor Designs, U.S. Nuclear Regulatory Commission, March 28, 2003

18. SECY-2005-0006, Second Status Paper on the Staff's Proposed Regulatory Structure for New Plant Licensing and Update on Policy Issues Related to New Plant Licensing, January 7, 2005

19. SECY-93-087, Policy, Technical, And Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs, U.S. Nuclear Regulatory Commission, April 1993

20. SRM 2003-0047, Staff Requirements Memorandum for SECY 03-0047Policy Issues Related to Licensing Non-Light Water Reactor Designs, U.S. Nuclear Regulatory Commission, June 26, 2003

21. U.S. Department of Energy Guidance for Developing Principal Design Criteria for Advanced (Non-Light Water) Reactors, INL/EXT-14-31179 Revision 1, December 2014

22. U.S. Nuclear Regulatory Commission Regulatory Guide 1.232, Guidance for Developing Principal Design Criteria for Non-Light Water Reactors, Revision 0, April 2018

23. U.S. Nuclear Regulatory Commission, Office of New Reactors, Assessment of White Paper Submittals on Defense-In-Depth, Licensing Basis Event Selection, And Safety Classification of Structures, Systems and Components, Next Generation Nuclear Plant Project 0748, Attached to Letter from NRC to DOE, July 17, 2014

24. U.S. Nuclear Regulatory Commission, Standard Review Plan, NUREG-0800, Chapter 17.4 Reliability Assurance Program, Revision 1, May 2014

25. Electric Power Research Institute, ALWR Policy and Summary of Top-Tier Requirements, TR-016780, Revision 2, 1999

26. Electric Power Research Institute, Program on Technology Innovation: Scoping Study for an Owner-Operator Requirements Document (ORD) for Advanced Reactors, Final Report, TR-3002008041, September 2016

27. Electric Power Research Institute, Program on Technology Innovation: Owner-Operator Requirements Guide (ORG) for Advanced Reactors, TR-3002011802, Revision 0, March 2018

28. GE Hitachi Nuclear Energy, Final Scientific/Technical Report: Development/Modernization of an Advanced Non-LWR Probabilistic Risk Assessment, DOEGEHH08325, 2017

29. U.S. Department of Energy, Probabilistic Risk Assessment for the Standard Modular High Temperature Gas-Cooled Reactor, DOE-HTGR-86-011, Revision 5, April 1988

30. F. Reitsma, Licensing Issues and the PIRT, IAEA Course on High temperature Gas Cooled Reactor Technology, Oct 22-26, 2012, retrieved 5/11/18 https://www.iaea.org/NuclearPower/Downloadable/Meetings/2012/2012-10-22-10-26-WS-NPTD/Day-4/20.ReitsmaLicensing.pdf

31. Sandia National Laboratories, Metal Fire Implications for Advanced Reactors, Part 2: PIRT Results, SAND2008-6855, September 2008

March 2020

32. Nuclear Energy Institute, Industry Guideline for the ITAAC Closure Process Under 10 CFR Part 52, NEI 08-01 (Revision 5), July 2013

33. Nuclear Energy Institute, Industry Guideline for the Development of Tier 1 and ITAAC under 10 CFR Part 52, NEI 15-02, Draft A of Revision 0, May 2015

34. Reer, B., V.N. Dang, and S. Hirschberg, The CESA Method and Its Application in a Plant-Specific Pilot Study on Errors of Commission, Reliability Engineering & System Safety, 83:

187-205, 2004

35. U.S. Department of Energy, Assessment of Applicability of Standards Endorsed by Regulatory Guides to Sodium Fast Reactors, ORNL/SR-2017/520, prepared by Oak Ridge National Laboratory, September 2017

36. U.S. Department of Energy, VISION and STRATEGY for the Development and Deployment of Advanced Reactors, DOE/NE-0147, January 2017

37. U.S. Nuclear Regulatory Commission, Guidelines on the Treatment of Uncertainties Associated with PRAs in Risk-Informed Decision-Making, NUREG-1855, Revision 1, March 2017

38. U.S. Department of Energy, Molten Salt Reactor Technology Roadmap, ORNL/TM-2017/199, prepared by Oak Ridge National Laboratory, draft for comment, June 2018

39. ASME, Roadmap to Develop ASME Code Rules for the Construction of High Temperature Gas-Cooled Reactors (HTGRs), STP-NU-045-1, 2012

40. Korsah, Kofi, Ramuhalli, Pradeep, Vlim, R., Kisner, Roger A., Britton, Jr, Charles L., Wootan, D. W.,

Anheier, Jr, N. C., Diaz, A. A., Hirt, E. H., Chien, H. T., Sheen, S., Bakhtiari, Sasan, Gopalsami, S.,

Heifetz, A., Tam, S. W., Park, Y., Upadhyaya, B. R., and Stanford, A. Assessment of Sensor Technologies for Advanced Reactors. United States: N. p., 2016. Web. doi:10.2172/1345781.

41. ASME, Non-Destructive Examination (NDE) and In-Service Inspection (ISI) Technology for High Temperature Reactors, STP-NU-044 - 2011, 2011

42. B. S. Gray, The Effect of Reactor Radiation on Cements and Concrete, in Proceedings of the Conference on Prestressed Concrete Pressure Vessels, pp. 17-39, Commission of European Communities, Luxembourg City, Luxembourg, 1972

43. U.S. Department of Energy, Research and Development Roadmaps for Liquid Metal Cooled Fast Reactors - Draft for Public Comment, Argonne National Laboratory, ANL/ART-88 Rev. 02, June 5, 2018

44. U.S. Department of Energy, "Compatibility Studies of Potential Molten-Salt Breeder Reactor Materials in Molten Fluoride Salts," Oak Ridge National Laboratory, ORNL-TM-5783, May 1977

45. L. C. Olson et al., "Materials Corrosion in Molten LiF-NaF-KF Salt," J. Fluorine Chem. 130, 67, 2009

46. Nuclear Energy Institute, Risk-Informed Performance-Based Technology Inclusive Guidance for Advanced Reactor Licensing Basis Development (NEI 18-04 Rev 0)

March 2020 APPENDIX A: HIGHEST PRIORITY CODES AND STANDARDS FOR NEAR-TERM DEPLOYMENT Responsible Description of Content and Issues to be Document Organization Addressed This new standard would contain methods and data needed to calculate the concrete thickness required for radiation shielding in advanced nuclear power plants. Specific Equivalent to ANSI/ANS 6.4-recommendations are to be made regarding 2006, Concrete for Passive ANS radiation attenuation calculations, shielding Heat Removal Systems -

design, and standards of documentation. The Irradiation and Thermal Limits standard would provide guidance to architect-engineers, utilities, and reactor vendors who are responsible for the shielding design of advanced reactor designs.

ANS-30.1-201x Risk-informed This standard describes the objectives of Performance-Based Principles incorporating risk-informed and performance and Methods based (RIPB) information into the safety ANS design of advanced reactors. This standard will demonstrate high-level uses of RIPB methods.

ANS-30.2-201x Categorization This standard provides a single technology and classification of SSCs neutral categorization and classification process for SSCs for advanced reactors that is, where possible, RIPB. This process will ANS then be used to determine special treatment of SSCs to meet the safety basis. It would provide a complete (e.g., necessary and sufficient) repeatable logical process based upon RIPB objectives.

This standard establishes requirements for a PRA for advanced non-light water reactor nuclear power plants. The requirements in this standard were developed for a broad range of PRA scopes including operating ASME/ANS RA-S-1.4-2013 PRA states, hazard types, and different end states.

ASME/ANS for Non-LWRs (trial use) This standard has been issued for trial use and has been subjected to many trial use applications. Lessons learned from the trial use and other parallel activities are currently being used by the JCNRM to provide an update for ANS status in 2020.

March 2020 Responsible Description of Content and Issues to be Document Organization Addressed This standard provides a process for establishing top-level safety criteria; safety functions; top-level design criteria; licensing-basis events; design-basis accidents; safety ANSI/ANS 53.1 Nuclear Safety classification of systems, structures and Design Process for Modular components (SSCs); safety analyses; defense-ANS Helium-Cooled Reactor Plants, in-depth; and adequate assurance of special 2011 treatment requirements for safety-related SSCs throughout the operating life of the plant. The standard does not provide detailed guidance for design; other standards cover that.

Changes are necessary to reflect functional containment concept. For example, the containment barrier is essentially leak-tight rather than an effective barrier ASME BPVC Division 1 and 2, to describe the containment function for Subsection NCA, Containment ASME concepts that may rely on acceptable design Barrier condition leak rates. The rules of Subsection NCA constitute requirements for the design, construction, stamping, and overpressure protection of items used in nuclear power plants and other nuclear facilities.

A new standard is needed to define:

1. the means to detect sodium leakage into inert or air environments,

2. the extent to which sodium-air and sodium-concrete reactions are limited New standards equivalent to and controlled, SFR-DC 73 for sodium leak ANS detection and mitigation (see 3. the degree to which the effects of fires NRC RG 1.232) are mitigated, and

4. the means for evaluating the effectiveness of special features or conditions containing sodium to ensure that the safety functions of SSCs important to safety are maintained.

March 2020 Responsible Description of Content and Issues to be Document Organization Addressed This standard specifies minimum design, actuation, testing, and maintenance requirements for the containment isolation of fluid systems after a LOCA in LWRs. These fluid systems penetrate the primary containment and include piping systems ANS 56.2-1984 (ANSI N271- (including instrumentation and control) for all 1976), Containment Isolation ANS fluids entering or leaving the containment.

for Fluid Systems Electrical systems are not included. The provisions for containment isolation impose additional requirements which are not required for the fluid system function.

Changes are necessary to address the varied advanced reactor designs, coolants as well as functional containment concepts.

This standard considers the design, fabrication, inspection, and testing of air cleaning and conditioning components and ASME AG-1-2009, Air and Gas ASME appurtenances used in safety-related systems Treatment in nuclear facilities. Changes are necessary to address the varied advanced reactor designs as well as functional containment concepts.

This Section contains requirements for the material, design, fabrication, and examination of supports which are intended to conform to the requirements for Classes 1, 2, 3, and metal containment construction.

Nuclear power plant supports for which rules ASME BPVC Section III, are specified in this Subsection are those Construction of plant ASME metal supports which are designed to components transmit loads from the pressure retaining barrier of the component or piping to the load carrying building structure. Changes are necessary to address the varied advanced reactor designs as well as functional containment concepts.

Additive manufacturing offers a new New Standards for Advanced paradigm for engineering design and Manufacturing Techniques, ASME manufacturing by enabling unique macro-including Additive structural design of components and manufacturing micro/nano-structural design of the material.

There is a need to develop and publish

March 2020 Responsible Description of Content and Issues to be Document Organization Addressed NOTE: This standard was not standards applicable to the manufacturing of included in either the ORNL components suitable for use in safety-related report or the ANS/RES and other plant applications. These standards summary. also need to be applicable to manufacturing replacement parts for operating plants and to manufacturing components for advanced reactors, addressing the higher temperature and non-light water operating environments.

Subsection NE pertains to Class MC components while Division 2 pertains to concrete reactor vessels and containments.

Changes are necessary to address the varied ASME BPVC Section III Division advanced reactor designs as well as 1, Subsection NE and 2, ASME functional containment concepts. Updates Containment should consider including steel-plate composite (SC) construction for containment structures. Note that AISC N690 allows for SC walls for safety-related structures other than containment.

There are various activities being undertaken and on-going to supplement Division 5.

Activities such as extending the qualified lifetimes of Class A materials to support a 60-year design life, qualification of additional materials, development of analysis methods ASME BPVC Section III, Division to simplify the Division 5 design analyses, ASME 5, High Temperature Reactors development of design rules for integrally cladded components with weld overlay on Class A materials to support molten salt reactor applications, incorporation of graphite irradiation data to support graphite design rules, and incorporation of ceramic composite design rules.

This standard covers requirements for the design, construction, and qualification and acceptance testing of the air-cleaning units ASME N509-2002, Air Cleaning and components which make up Engineered ASME Units and Components Safety Feature (ESF) and other high efficiency air and gas treatment systems used in nuclear power plants. The standard does not cover sizing of a complete nuclear air treatment system, redundancy, or single-

March 2020 Responsible Description of Content and Issues to be Document Organization Addressed failure requirements. It applies only to systems which employ particulate filtration, ambient-temperature adsorption, or both, as the principal functional mechanism. Changes are necessary to address the varied advanced reactor designs.

This standard describes the requirements and guideline for qualifying active mechanical equipment, such as pumps, valves, and dynamic restraints, used in nuclear facilities.

ASME QME-1-2007, The requirements and guidelines presented Qualification of Active ASME include the principles, procedures, and Mechanical Components methods of qualification. Changes are necessary to address the varied advanced reactor design components and high temperature applications.

This standard specifies methods for determining the fire-resistive abilities of building members and assemblies, including tests of:

1. Bearing and nonbearing walls and partitions NFPA 251, Methods of Tests of 2. Columns Fire Resistance of Building NFPA Construction and Materials 3. Floor and roof assemblies

4. Loaded restrained beams

5. Performance of protective membranes in wall, partition, floor, or roof assemblies.

Changes are necessary to address the varied advanced reactor design SSCs.

This standard provides general considerations in designing reinforced ACI 349.1R-07, Reinforced concrete structures for nuclear power plants Concrete Design for Thermal ACI subject to thermal effects. Thermal effects Effects are defined to be the exposure of a structure or component thereof to varying temperature at its surface or temperature gradient through its cross section; the

March 2020 Responsible Description of Content and Issues to be Document Organization Addressed resulting response of the exposed structure is a function of its age and moisture content, temperature extreme(s), duration of exposure, and degree of restraint. The terms force, moment, and stress apply and are used in this report where a structure is restrained against thermally induced movements. Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

This Code provides minimum requirements for design and construction of nuclear safety-related concrete structures and structural members for nuclear facilities. Safety-related structures and structural members subject to this Code are those concrete structures that support, house, or protect nuclear safety ACI 349-2013, Nuclear Safety- class systems or component parts of nuclear related Concrete Structures ACI safety class systems. Specifically excluded and Structural Members from this Code are those structures covered by Code for Concrete Containments, ASME Boiler and Pressure Vessel Code Section III, Division 2, and pertinent General Requirements (ACI 359). Limited changes are necessary mostly to address specific language in the standard so as to be applicable to the varied advanced reactor designs.

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