ML19221B421
| ML19221B421 | |
| Person / Time | |
|---|---|
| Issue date: | 08/15/2019 |
| From: | Kevin Hsueh NRC/NRR/DRA/ARCB |
| To: | Brian Bonser, Anthony Dimitriadis, Steven Orth, Greg Warnick Division of Nuclear Materials Safety I, NRC/RGN-II/DRS/EB3, Plant Support Branch II, Division of Nuclear Materials Safety IV |
| dxg6 | |
| References | |
| Download: ML19221B421 (5) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 August 15, 2019 MEMORANDUM TO: Anthony Dimitriadis, Chief Decommissioning, ISFSI and Reactor HP Branch Division of Nuclear Materials Safety Region I Brian Bonser, Chief Engineering Branch 3 Division of Reactor Safety Region II Steven Orth, Chief Plant Support Branch Division of Reactor Safety Region III Greg Warnick, Chief Reactor Inspection Branch Division of Nuclear Material Safety 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 2016-2018 MONITORING YEARS is provided for your use in planning inspections and dispositioning inspection findings. The U. S. Nuclear Regulatory Commissions (NRC) Inspection Manual contains references to Three Year Rolling Average (TYRA) collective dose in the resource estimate section of Inspection Procedure (IP) 71124.02, Occupational ALARA Planning and Controls, dated December 21, 2017, and in Section IV of Inspection Manual Chapter (IMC) 0609, Appendix C, Public Radiation Safety Significance Determination Process, dated February 12, 2008.
IP 71124.02 directs inspection resources to be applied using a graded approach based on plant ranking by TYRA collective dose. The plants in the first quartile are usually assigned the lowest number of inspection hours, whereas the plants in the fourth quartile are usually assigned the highest number of inspection hours.
Enclosure:
Collective Dose Quartile Tables 2016-2018 CONTACT: David Garmon (301) 415-3512
A. Dimitriadis Plants in the middle two quartiles typically receive the average number of inspection hours allowed by IP 71124.02. However, NRC inspection staff is allowed to adjust inspection hours as necessary to fulfill the objectives of the IP.
When dispositioning performance deficiencies in the as low as is reasonably achievable (ALARA) area, IMC 0609, Appendix C directs NRC staff to consider a licensees overall performance in maintaining occupational doses ALARA. This consideration is intended to direct potential NRC follow-on inspection resources, that would result from greater than Green inspection findings, to those programs with the largest challenges. The TYRA collective dose is a high level indication of the radiological challenges encountered by an ALARA program.
Power reactor licensees are included as one of the seven categories of NRC licensees that are required by Title 10 of the Code of Federal Regulations (10 CFR) 20.2206 to report the results of individual monitoring that is required by 10 CFR 20.1502. Licensees may voluntarily include additional data for individuals for whom monitoring was provided but not required. 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 TYRA is determined by summing the collective dose per reactor for the current year and the previous 2 years and then dividing this sum by 3, which is the number of years considered.
- via email OFFICE NRR/DRA/ARCB BC: RES/DSA/RPB BC: NRR/DRA/ARCB NAME DGarmon JTomon
- KHsueh DATE 08 / 09 / 2019 08 / 12 /2019 08 / 15 /2019 THREE-YEAR COLLECTIVE TOTAL EFFECTIVE DOSE EQUIVALENT PER REACTOR-YEAR FOR BOILING WATER REACTORS 2016-2018 ENCLOSURE 1
THREE-YEAR COLLECTIVE TOTAL EFFECTIVE DOSE EQUIVALENT PER REACTOR-YEAR FOR PRESSURIZED WATER REACTORS 2016-2018