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Report No.

Dose assessment for sub-surface disposal of radioactive waste, 2; Study on "Inadvertent Human Intrusion or Rare Natural Event Scenarios"

Sugaya, Toshikatsu; Nakatani, Takayoshi ; Sone, Tomoyuki ; Ishitoya, Kimihide; Funabashi, Hideyuki ; Nakai, Kunihiro*; Shimada, Hidemitsu*

The purpose of this study was safety assessment of "Inadvertent Human Intrusion or Rare Natural Event Scenarios" on sub-surface disposal. It was one of "Classification of three types scenarios" in "Basic Policy for Safety Regulation Concerning Land Disposal of Low-Level Radioactive Waste (Interim Report)" formulated by the NSC. Considering of assessed scenario, selection of the assessed scenarios, development of the assessment tool and preliminary exposure dose assessment were conducted according to the standard of the AESJ. As the results, exposure dose of "Well water drinking scenario" was the highest in the assessment scenarios. This scenario assumed that the groundwater in Excavation Disturbed Zone (EDZ) was directly used as drinking water without any dilution. Although, this was very conservative condition and the result exceeded 10 mSv/y, it stayed under the upper limit of standard dose value for "Inadvertent Human Intrusion or Rare Natural Event Scenarios" (10-100 mSv/y).



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