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Key Issues on Radiological Protection from Radioactive Waste Management in Existing Exposure Situation

TS12c.1. Key Issues on Radiological Protection from Radioactive Waste Management in Existing Exposure Situation. Daisuke SUGIYAMA , Takatoshi HATTORI. IRPA 13, Glasgow. 17 May 2012. Background. 0. 10km. 5. Annual dose [ mSv /y] (12 March 2011 – 11 March 2012) .

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Key Issues on Radiological Protection from Radioactive Waste Management in Existing Exposure Situation

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  1. TS12c.1 Key Issues on Radiological Protectionfrom Radioactive Waste Management inExisting Exposure Situation Daisuke SUGIYAMA, Takatoshi HATTORI IRPA 13, Glasgow 17 May 2012

  2. Background 0 10km 5 Annual dose[mSv/y] (12 March 2011 – 11 March 2012) http://radioactivity.mext.go.jp/en/contents/5000/4171/24/1750_1108_set.pdf • Remediation • Decontamination • Radioactive waste management (all steps from its generation to disposal, including storage) • Lack of RP system for WM in existing exposure situations

  3. Key Issues • Definition and Selection of Reference Levels for existing ambient dose and radioactive waste management • Participation of stakeholders in the decision-making process Fundamental Concept • Existing exposure situation • Justification and optimisation

  4. Definition and Selection of Reference Levels • Reference level (ICRP Pub. 103 & 111) • Source-related restriction to individual dose • Selected in 1-20 mSv/y dose band • Potential exposure from radioactive waste management is: • Justified when the individual dose reduced • Optimised taking the averted existing ambient dose into account • Intermediate reference levels should be selected progressively • Final target at 1 mSv/y for disposal

  5. Definition and Selection of Reference Levels

  6. Participation of Stakeholders Participation of the stakeholders in the decision-making is strongly recommended (ICRP Pub. 82 & 111) It is appropriate to select gradual intermediate reference levels for the existing annual ambient dose and for waste management according to the progress of the reduction in the individual doses in the integrated plan of environmental remediation

  7. Framework of RP for Radioactive Waste Management in Existing Exposure Situation • The reference level for radioactive waste management is selected below the reference level selected for the existing annual ambient dose in the environment. • Intermediate reference levels are adopted gradually according to the progress of the reduction in the existing ambient dose in the environment including the participation of stakeholders.

  8. Application to Fukushima Decontamination of Cs-137 & Cs-134

  9. Conclusions • Proposal of a framework of radiation protection from radioactive waste management in existing exposure situations • Intermediate reference levels for such waste management are adopted gradually according to the progress of the reduction in the existing annual ambient dose in the environment to or below the order of 1 mSv/y that corresponds to the natural background level. • Intermediate reference levels are selected to make the remediation activities reasonably practical on the basis of the principle of justification and optimisation including the participation of relevant stakeholders living in existing exposure situations.

  10. Current Guideline for Disaster Waste (Ministry of the Environment ) “Where is Optimisation!” - Interim Storage - Strictly Controlled Landfill Disposal Radioactivity of Cs-134 and Cs-137 100,000 Bq/kg : 1 mSv/y for Public (Operation) 10 μSv/y for Public (Post-closure) - Controlled Landfill Disposal 8,000 Bq/kg : 1 mSv/y for Worker (Operation) (Disposed as Generic Wastes)

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