Use of ARCON Methodology for Calculation of Accident-Related Offsite Atmospheric Dispersion Factors

CourtNuclear Regulatory Commission
Citation86 FR 46024
Record Number2021-17596
Publication Date17 Aug 2021
Federal Register, Volume 86 Issue 156 (Tuesday, August 17, 2021)
[Federal Register Volume 86, Number 156 (Tuesday, August 17, 2021)]
                [Notices]
                [Pages 46024-46025]
                From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
                [FR Doc No: 2021-17596]
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                NUCLEAR REGULATORY COMMISSION
                [NRC-2021-0133]
                Use of ARCON Methodology for Calculation of Accident-Related
                Offsite Atmospheric Dispersion Factors
                AGENCY: Nuclear Regulatory Commission.
                ACTION: Draft regulatory guide; request for comment.
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                SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is issuing for
                public comment draft regulatory guide (DG), DG-4030, ``Use of ARCON
                Methodology for Calculation of Accident-Related Offsite Atmospheric
                Dispersion Factors.'' This proposed new regulatory guide (RG) describes
                an approach for reactor applicants and licensees for determining
                atmospheric relative concentration ([chi]/Q) values in support of
                modeling onsite releases to offsite boundaries from a design-basis
                accident. Also, this proposed guidance implements the methodology in RG
                1.194, ``Atmospheric Relative Concentrations for Control Room
                Radiological Habitability Assessments at Nuclear Power Plants,'' for
                offsite dose locations at boundaries.
                DATES: Submit comments by September 16, 2021. Comments received after
                this date will be considered if it is practical to do so, but the NRC
                is able to ensure consideration only for comments received on or before
                this date. Although a time limit is given, comments and suggestions in
                connection with items for inclusion in guides currently being developed
                or improvements in all published guides are encouraged at any time.
                ADDRESSES: You may submit comments by any of the following methods;
                however, the NRC encourages electronic comment submission through the
                Federal Rulemaking website:
                 Federal Rulemaking Website: Go to https://www.regulations.gov and search for Docket ID NRC-2021-0133. Address
                questions about Docket IDs in Regulations.gov to Stacy Schumann;
                telephone: 301-415-0624; email: [email protected]. For technical
                questions, contact the individuals listed in the FOR FURTHER
                INFORMATION CONTACT section of this document.
                 Mail comments to: Office of Administration, Mail Stop:
                TWFN-7-A60M, U.S. Nuclear Regulatory Commission, Washington, DC 20555-
                0001, ATTN: Program Management, Announcements and Editing Staff.
                 For additional direction on accessing information and submitting
                comments, see ``Obtaining Information and Submitting Comments'' in the
                SUPPLEMENTARY INFORMATION section of this document.
                FOR FURTHER INFORMATION CONTACT: Jason White, Office of Nuclear Reactor
                Regulation, telephone: 301-415-3212, email: [email protected], Kevin
                Quinlan, Office of Nuclear Reactor Regulation, telephone: 301-415-6809,
                email: [email protected], or Harriet Karagiannis, Office of Nuclear
                Regulatory Research, telephone: 301-415-2493, email:
                [email protected]. All are staff of the U.S. Nuclear
                Regulatory Commission, Washington, DC 20555-0001.
                SUPPLEMENTARY INFORMATION:
                I. Obtaining Information and Submitting Comments
                A. Obtaining Information
                 Please refer to Docket ID NRC-2021-0133 when contacting the NRC
                about the availability of information regarding this action. You may
                obtain publicly available information related to this action by any of
                the following methods:
                 Federal Rulemaking Website: Go to https://www.regulations.gov and search for Docket ID NRC-2021-0133.
                 NRC's Agencywide Documents Access and Management System
                (ADAMS): You may obtain publicly available documents online in the
                ADAMS Public Documents collection at https://www.nrc.gov/reading-rm/adams.html. To begin the search, select ``Begin Web-based ADAMS
                Search.'' For problems with ADAMS, please contact the NRC's Public
                Document Room (PDR) reference staff at 1-800-397-4209, 301-415-4737, or
                by email to [email protected].
                 Attention: The PDR, where you may examine, and order
                copies of public documents, is currently closed. You may submit your
                request to the PDR via email at [email protected] or call 1-800-397-
                4209 or 301-415-4737, between 8:00 a.m. and 4:00 p.m. (ET), Monday
                through Friday, except Federal holidays.
                B. Submitting Comments
                 The NRC encourages electronic comment submission through the
                Federal Rulemaking website (https://www.regulations.gov). Please
                include Docket ID NRC-2021-0133 in your comment submission.
                 The NRC cautions you not to include identifying or contact
                information that you do not want to be publicly disclosed in your
                comment submission. The NRC will post all comment submissions at
                https://www.regulations.gov as well as enter the
                [[Page 46025]]
                comment submissions into ADAMS. The NRC does not routinely edit comment
                submissions to remove identifying or contact information.
                 If you are requesting or aggregating comments from other persons
                for submission to the NRC, then you should inform those persons not to
                include identifying or contact information that they do not want to be
                publicly disclosed in their comment submission. Your request should
                state that the NRC does not routinely edit comment submissions to
                remove such information before making the comment submissions available
                to the public or entering the comment submissions into ADAMS.
                II. Additional Information
                 The NRC is issuing for public comment a DG in the NRC's
                ``Regulatory Guide'' series. This series was developed to describe
                methods that are acceptable to the NRC staff for implementing specific
                parts of the agency's regulations, to explain techniques that the staff
                uses in evaluating specific issues or postulated events, and to
                describe information that the staff needs in its review of applications
                for permits and licenses.
                 This DG, identified by its task number, DG-4030, titled, ``Use of
                ARCON Methodology for Calculation of Accident-Related Offsite
                Atmospheric Dispersion Factors,'' is a proposed new RG 4.28 (ADAMS
                Accession No. ML21165A005). This proposed new RG 4.28 provides guidance
                to industry for complying with and implementing the NRC requirements by
                endorsing the use of the ARCON computer code to calculate offsite
                dispersion values out to distances of 1,200 m (3,937 ft) that could
                include the exclusion area boundary and/or low-population zone.
                 RG 1.194 (ADAMS Accession No. ML031530505) endorses the use of the
                ARCON96 computer code for calculating accident-related onsite (control
                room and technical support center) atmospheric dispersion values which
                are direct inputs to habitability dose assessments. In addition, RG
                1.145, ``Atmospheric Dispersion Models for Potential Accident
                Consequence Assessments at Nuclear Power Plants'' (ADAMS Accession No.
                ML12216A014), provides the present methodology incorporated into the
                PAVAN computer code, as reviewed by the staff using NUREG-0800 at
                https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0800/index.html (ADAMS Accession No. ML070810350), SRP Section 2.3.4 for
                calculating accident-related related, offsite atmospheric dispersion
                values.
                 RG 4.28 will provide new guidance for applicants and licensees
                subject to Part 50 of title 10 of the Code of Federal Regulations (10
                CFR), ``Domestic Licensing of Production and Utilization Facilities'';
                10 CFR part 52, ``Licenses, Certifications, and Approvals for Nuclear
                Power Plants''; and 10 CFR part 100, ``Reactor site criteria.''
                 The staff is also issuing for public comment a draft regulatory
                analysis (ADAMS Accession No. ML21165A007). The staff develops a
                regulatory analysis to assess the value of issuing or revising a
                regulatory guide as well as alternative courses of action.
                III. Backfitting, Forward Fitting, and Issue Finality
                 Issuance of DG-4030, if finalized, would not constitute backfitting
                as that term is defined in 10 CFR 50.109, ``Backfitting'' and as
                described in NRC Management Directive (MD) 8.4, ``Management of
                Backfitting, Forward Fitting, Issue Finality, and Information
                Requests''; constitute forward fitting as that term is defined and
                described in MD 8.4; or affect issue finality of any approval issued
                under 10 CFR part 52. As explained in DG-4030, applicants and licensees
                are not required to comply with the positions set forth in DG-4030.
                 Dated: August 10, 2021.
                 For the Nuclear Regulatory Commission.
                Ronaldo V. Jenkins,
                Acting Chief, Regulatory Guidance and Programs Management Branch,
                Division of Engineering, Office of Nuclear Regulatory Research.
                [FR Doc. 2021-17596 Filed 8-16-21; 8:45 am]
                BILLING CODE 7590-01-P
                

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