Radioactive Waste Management Sub-department
 
 

Solution of various problems accompanied by the use of nuclear energy and conservation of the environment.

 
 

We must pay special attention to the safe management of radioactive waste. We are studying several issues related to radioactive waste treatment and disposal.

Our main issues are dehydration and stabilization of evaporation concentrate with high salt content, and decommissioning of nuclear facilities as well as column and field experiments of radionuclide migration to evaluate the influence in radioactive waste depository.

We are also engaged in development of environmental radioactivity dosimetry and investigation of the consequences due to radiation accidents.

 
 
 
     
  Faculty  
 
     
 
Professor : Akio Koyama
 
Research Topics
Quantities of radioactive waste and its radioactive inventory, which will arise from future dismantlement of research reactor, are studied as well as technological and safety aspect of radioactive waste disposal.
 
Contact / Office
Research Building , Research Reactor Institute
TEL +81-724-51-2382 / FAX +81-724-52-8193
koyama@rri.kyoto-u.ac.jp
     
 
     
 
     
 
Assistant Professor : Hiroaki Koide
 
Research Topics
Various risks accompanied by the use of nuclear energy are evaluated. Radioactive contamination in the environment is investigated both for normal operation and accidents. In addition, safety issues about the engineering of nuclear facilities and issues about influences of energy consumption on mankind are studied.
 
Contact / Office
Research Building , Research Reactor Institute
TEL +81-724-51-2458 / FAX +81-724-52-8193
koide@rri.kyoto-u.ac.jp
     
 
     
 
     
 
Assistant Professor : Tetsuji Imanaka
 
Research Topics
Environmental impact from the use of nuclear energy is studied both for normal operation and accidental events. Radiation transport codes are also developed for radiation shielding and human exposure assessment.
 
Contact / Office

Research Building , Research Reactor Institute
TEL +81-724-51-2443 / FAX +81-724-52-8193
imanaka@rri.kyoto-u.ac.jp

     
 
     
 
     
 
Assistant Professor : Satoshi Fukutani
 
Research Topics
Experimental and analytical study to clarify migration and chemical behavior of hazardous elements in soil and soil/plant system released in the environment such as radionuclides or heavy metals.
 
Contact / Office
Research Building , Research Reactor Institute
TEL +81-724-51-2381 / FAX +81-724-52-8193
fukutani@rri.kyoto-u.ac.jp
     
 
     
     
  Research Topics
     
 
( Index )
Waste management of nuclear facility decommissioning
Assessment of radiological consequences caused by accidents at nuclear facilities
Radioactivity monitoring in the environment and dose assessment
Behavior and assessment of hazardous substances in soil
 
     
     
 

Waste management of nuclear facility decommissioning

 

Recently increased the number of nuclear facilities that stop their operation because of plant lifetime. Disposal of a large quantity of waste as a result of decommissioning of nuclear facilities become and will be important. Therefore much effort are devoted on the development of disposal of such waste.

To accomplish decommissioning of nuclear facility, it is essential to collect data on the quantity, property and radioactive inventory of radioactive waste.

It is difficult to measure radioactive inventory of every part of nuclear reactor in operation. Radioactive inventory can be calculated using data of element content and neutron flux, which is obtained by neutron transport code or Monte Carlo method.

Other overall information of design and operation data of the nuclear plant to be decommissioned must be considered, then the quantity of waste and radioactive inventory of each material can be obtained.

 
 
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Assessment of radiological consequences caused by accidents at nuclear facilities

 
 

Radiological consequences of nuclear accidents that will release radioactivity in the environment are studied. The level of radioactive contamination and radiation exposure is evaluated supposing various modes of accident sequences and atmospheric conditions. The consequences of the actual accidents such as the Chernobyl NPP accident in USSR and JCO criticality accident in Tokai-mura are also investigated.

 
 
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Radioactivity monitoring in the environment and dose assessment

 
 

Environmental impact of radioactivity released from nuclear facilities in normal operation is evaluated by observing radioactive contamination around them. Low level gamma-ray spectrometry with Ge detector is developed as well as portable spectrometry in the field. Dose assessment is also carried out based on the monitoring data around nuclear facilities.

 
 
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Behavior and assessment of hazardous substances in soil

 
 

Pollutants such as heavy metals discharged from stacks of incinerators , smelters and so on , fall down and are attached on the ground. They stay near surface of the ground , and transfer to the depth in the ground slowly. The mechanisms of the transfer and the sorption/desorption of the pollutant are made clear and effects for environment(and human) by the pollutant are estimated. Chemical form of the pollutant which is considered to a factor of migration in the soil is especially paid attention to, the qualitative and quantitative measuring techniques are attempted to develop.

 
 
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