ML23026A278
| ML23026A278 | |
| Person / Time | |
|---|---|
| Issue date: | 01/30/2023 |
| From: | Kevin Hsueh NRC/NRR/DRA/ARCB |
| To: | Binoy Desai, Anthony Dimitriadis, Dave Hills, Greg Warnick NRC Region 4, Decommissioning, ISFSI, and Reactor Health Physics Branch, Division of Reactor Safety II, NRC/RGN-III/DRSS |
| References | |
| Download: ML23026A278 (5) | |
Text
January 30, 2023 MEMORANDUM TO:
Anthony Dimitriadis, Chief Decommissioning, ISFSI and Reactor HP Branch Division of Radiological Safety and Security NRC Region I Binoy Desai, Chief Engineering Branch 3 Division of Reactor Safety NRC Region II David Hills, Chief Decommissioning, Reactor, and ISFSI HP Branch Division of Radiological Safety and Security NRC Region III Greg Warnick, Chief Decommissioning, ISFSI and Operating Reactor Branch Divison of Radiological Safety and Security NRC Region IV FROM:
Kevin Hsueh, Chief /RA/
Radiation Protection and Consequence Branch Division of Risk Assessment Office of Nuclear Reactor Regulation
SUBJECT:
THREE-YEAR COLLECTIVE TOTAL EFFECTIVE DOSE EQUIVALENT PER REACTOR-YEAR FOR 2019-2021 MONITORING YEARS is provided for your use in dispositioning certain inspection findings within the Occupational Radiation Safety Cornerstone of the Reactor Oversight Process. The Nuclear Regulatory Commissions (NRC) Inspection Manual contains references to the Three-Year Rolling Average (TYRA) collective dose in Step 2 of Section IV of Inspection Manual Chapter (IMC) 0609, Appendix C, Public Radiation Safety Significance Determination Process, dated August 19, 2008.
When dispositioning inspection findings in the As Low As is Reasonably Achievable (ALARA) area, IMC 0609, Appendix C instructs NRC staff to consider a licensees overall performance in maintaining occupational doses ALARA. This consideration is intended to risk-inform NRC actions by directing potential follow-on inspection resources to those programs with the largest radiological challenges. The TYRA collective dose is a high-level indication of the radiological challenges encountered by an ALARA program.
CONTACT: David Garmon, NRR/DRA 301-415-3512
A. Dimitriadis, al.
Power reactor licensees are included as one of the seven categories of NRC licensees that are required to report, per Title 10 of the Code of Federal Regulations (CFR 20.2206), the results of individual monitoring required by 10 CFR 20.1502. Licensees may voluntarily include additional data for individuals for whom monitoring was provided but not required by 10 CFR 20.1502.
The data provided in Enclosure 1 was extracted from the Radiation Exposure Information and Reporting System the system the NRC uses to collect and store occupational exposure data.
The data tables are shown in draft form because they are excerpts from the most current version (Volume 43) of NUREG-0713, Occupational Radiation Exposure at Commercial Nuclear Power Reactors and Other Facilties, which will not be finalized until later in 2023. The TYRA is determined by summing the collective dose per reactor for the most recent year for which data is available and the previous 2 years and then dividing this sum by 3, representing the number of years considered in the calculation.
Enclosure:
As Stated
ML23026A278 NRR-106 OFFICE NRR/DRA/ARCB BC: RES/DSA/RPB BC: NRR/DRA/ARCB NAME DGarmon JTomon (TBrock for)
KHsueh DATE 12/28/2022 12/28/2022 1/27/2023
1 THREE-YEAR COLLECTIVE TOTAL EFFECTIVE DOSE EQUIVALENT PER REACTOR-YEAR FOR BOILING WATER REACTORS 2019-2021 Enclosure
2 THREE-YEAR COLLECTIVE TOTAL EFFECTIVE DOSE EQUIVALENT PER REACTOR-YEAR FOR PRESSURIZED WATER REACTORS 2019-2021