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2017-01-09
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``Use of NUMARC/EPRI Report TR-102348, `Guideline on Licensing Digital Upgrades,' in Determining the Acceptability of Performing Analog-to-Digital Replacements Under 10 CFR 50.59''
Part VII
UNKNOWN
D09002ee1be06b8d4
United States
Nuclear Regulatory Commission
originator
org
United States Government Agency or Subagency
The Nuclear Regulatory Commission (NRC) is proposing to issue a generic letter to provide a new regulatory position on the use of Nuclear Management and Resources Council/Electrical Power Research Institute (NUMARC/EPRI) Report TR-102348, ``Guideline on Licensing Digital Upgrades.'' This report, dated December, 1993, provides guidance for determining when an analog-to-digital replacement can be performed without prior NRC approval under the requirements of Sec. 50.59 of title 10 of the Code of Federal Regulations (10 CFR 50.59). The report applies to all digital equipment that uses software and, in particular, to microprocessor-based systems. The report, together with the clarifications discussed in the proposed generic letter, would represent a method acceptable to the NRC for use in making a determination of whether or not an unreviewed safety question exists with respect to 10 CFR 50.59 requirements. In those cases where a licensee proposes to retrofit with a digital replacement system that the NRC had previously approved, the NRC review scope would be significantly reduced and would focus only on plant-specific issues associated with the modification (e.g., environmental qualifications and configuration management). The NRC would not review again generic aspects of the proposed design, such as the software development program, unless these aspects had changed or were affected by plant- specific differences. The NRC is seeking comment from interested parties regarding both the technical and regulatory aspects of the proposed generic letter presented under the Supplementary Information heading. The proposed generic letter and supporting documentation were discussed in the 259th meeting of the Committee to Review Generic Requirements (CRGR). The relevant information used to support CRGR review of the proposed generic letter will be available in the Public Document Rooms. In addition, the proposed generic letter and supporting documentation were discussed in a public meeting of the NRC Advisory Committee on Reactor Safeguards (ACRS) on September 8, 1994. Comments from the ACRS were incorporated in the proposed generic letter. The NRC will consider comments received from interested parties in the final evaluation of the proposed generic letter. The NRC final evaluation will include a review of the technical position and, when appropriate, an analysis of the value/impact on licensees. Should this generic letter be issued in final form by the NRC, it will become available for public inspection in the Public Document Rooms.
59 FR 0
https://www.govinfo.gov/app/details/FR-1994-10-18/94-25708
94-25708
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Federal Register: October 18, 1994
https://www.govinfo.gov/app/details/FR-1994-10-18/94-25708
https://www.govinfo.gov/content/pkg/FR-1994-10-18/html/94-25708.htm
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59 FR 0
``Use of NUMARC/EPRI Report TR-102348, `Guideline on Licensing Digital Upgrades,' in Determining the Acceptability of Performing Analog-to-Digital Replacements Under 10 CFR 50.59''; Federal Register Vol. 59, Issue
UNKNOWN
94-25708
VII
NUCLEAR REGULATORY COMMISSION
1995-01-17
Federal Register: October 18, 1994
7590-01-M
94-25708
Notice of opportunity for public comment.
The Nuclear Regulatory Commission (NRC) is proposing to issue a generic letter to provide a new regulatory position on the use of Nuclear Management and Resources Council/Electrical Power Research Institute (NUMARC/EPRI) Report TR-102348, ``Guideline on Licensing Digital Upgrades.'' This report, dated December, 1993, provides guidance for determining when an analog-to-digital replacement can be performed without prior NRC approval under the requirements of Sec. 50.59 of title 10 of the Code of Federal Regulations (10 CFR 50.59). The report applies to all digital equipment that uses software and, in particular, to microprocessor-based systems. The report, together with the clarifications discussed in the proposed generic letter, would represent a method acceptable to the NRC for use in making a determination of whether or not an unreviewed safety question exists with respect to 10 CFR 50.59 requirements. In those cases where a licensee proposes to retrofit with a digital replacement system that the NRC had previously approved, the NRC review scope would be significantly reduced and would focus only on plant-specific issues associated with the modification (e.g., environmental qualifications and configuration management). The NRC would not review again generic aspects of the proposed design, such as the software development program, unless these aspects had changed or were affected by plant- specific differences. The NRC is seeking comment from interested parties regarding both the technical and regulatory aspects of the proposed generic letter presented under the Supplementary Information heading. The proposed generic letter and supporting documentation were discussed in the 259th meeting of the Committee to Review Generic Requirements (CRGR). The relevant information used to support CRGR review of the proposed generic letter will be available in the Public Document Rooms. In addition, the proposed generic letter and supporting documentation were discussed in a public meeting of the NRC Advisory Committee on Reactor Safeguards (ACRS) on September 8, 1994. Comments from the ACRS were incorporated in the proposed generic letter. The NRC will consider comments received from interested parties in the final evaluation of the proposed generic letter. The NRC final evaluation will include a review of the technical position and, when appropriate, an analysis of the value/impact on licensees. Should this generic letter be issued in final form by the NRC, it will become available for public inspection in the Public Document Rooms.
Comment period expires January 17, 1995. Comments submitted after this date will be considered if it is practical to do so, but assurance of consideration cannot be given except for comments received on or before this date.
Paul Loeser, (301) 504-2825.
Federal Register
Vol. 59, no. 200
Office of the Federal Register, National Archives and Records Administration
1994-10-18
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