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Updated: Jun 1, 2026
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Multilateral analysis of increasing collective dose and new ALARA programme
Tadashi Oumi1, Yasuki Morii, Toshirou Imai
1The Japan Atomic Power Company, 1-1 Kanda-Mitoshiro-Cho, Chiyoda-Ku, Tokyo 101-0053, Japan. tadashi-oumi@japc.co.jp
Radiation Protection Dosimetry
|June 10, 2011
Summary
The Japan Atomic Power Company developed a new ALARA program, including 3D dose mapping and assistive machines, to reduce worker radiation exposure during nuclear plant maintenance. This initiative addresses increased collective doses from equipment replacement and extended outages, particularly at the Tokai-2 plant.
Area of Science:
- Nuclear Engineering
- Radiation Protection
- Occupational Health
Background:
- The Japan Atomic Power Company (JAPC) operates diverse nuclear reactors, including boiling water reactors (BWRs).
- Worker radiation doses have increased due to equipment replacement and extended outages, notably at the Tokai-2 BWR plant requiring seismic retrofitting.
- Existing radiation dose reduction efforts require enhancement to address rising collective doses.
Purpose of the Study:
- To analyze the causes of unacceptably high collective radiation doses during nuclear plant maintenance.
- To develop and implement an improved As Low As Reasonably Achievable (ALARA) program.
- To mitigate worker radiation exposure in nuclear power facilities.
Main Methods:
- Multilateral analysis of collective dose data.
- Development of a novel ALARA program incorporating advanced tools.
- Implementation of a 3D dose prediction mapping system.
- Introduction of worker-assistive machinery.
Main Results:
- The study identified key factors contributing to elevated collective doses.
- A new ALARA program was devised, integrating innovative technologies.
- The developed 3D dose prediction map aids in planning radiation exposure mitigation.
- Worker-assistive machines were introduced to reduce direct exposure during maintenance tasks.
Conclusions:
- The new ALARA program, featuring 3D dose prediction and assistive machinery, offers a promising approach to reducing worker radiation doses.
- Continuous improvement in radiation protection strategies is crucial for nuclear power plant operations.
- The findings provide a framework for enhancing safety protocols in similar nuclear facilities.
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