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We present the Japan Atomic Energy Agency (JAEA)'s work regarding the development of a land surface model and its applications to transport of radionuclides around nuclear facilities, such as the Rokkasho reprocessing plant of Japan Nuclear Fuel Limited. In particular, we focus on the environmental transfers of $^{14}$ C and $^{129}$ I - the major radionuclides of concern in respect to their potential impacts on radiological doses and long-lasting contamination of the terrestrial environment. JAEA has been developing a land surface model, named SOLVEG-II, that predicts transfer and exchange of water and CO $_{2}$ in an atmosphere-vegetation-soil system. We have introduced dynamics of $^{14}$ C and $^{129}$ I into SOLVEG-II; the developed model is therefore able to calculate the dynamics of $^{14}$ C and $^{129}$ I under realistic conditions with influences from water and CO $_{2}$ cycles in the target land surface ecosystem. Through applying the model to the transfer of $^{14}$ C and $^{129}$ I discharged from the Rokkasho reprocessing plant, key processes affecting contamination of vegetation were identified. In the presentation, some other applications (e.g. transfers of tritium and radiocesium) of the model will also be viewed.

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Sources of radioiodines in primary cooling water of Japan Materials Testing Reactor

Development of activated carbon fiber filter used for airborne radioiodine monitoring

Irradiation test of medium enriched uranium fuel elements in Japan Materials Testing Reactor; Confirmation of integrity of fuel elements by measurement of fission products in water

Biological half-life of radioiodine in normal Japanese thyroid

Light absorption spectrum of radioactive methyl iodide in air

Selective collection of organic iodide from the noble gas-containing atnrosphere by adsorbents used for radioiodine monitoring in nuclear accidents

A Method of Quantitative Measurement of Radioiodine Species Using Maypack Sampler

Release of radioiodine from UO $_{2}$ during reactor operation

Measurement of release rate of radioiodine-131 released from artificially pin-holed fuel rod into primary coolant of in-pile water loop.

Estemation Method of Projected Dose for Emergency Monitoring

Experiences in monitoring airborne radioactive contamination in JAERI

Relative reactivities of radioiodine released from U $_{3}$ O $_{8}$ in oxygen and helium atmospheres toward propane

Chemical identities of radioiodine released from U $_{3}$ O $_{8}$ in oxygen and inert gas atmospheres

Selective collection of trace amounts of radioiodine in radioactive sodium aerosol utilizing arc-discharge technique

Monitoring techniqnes for airborne radioiodine

Method for suppressing formation of organic iodides by reaction of carrier-free iodine-131 in HNO $_{3}$ solutions

Method for improving the collecting performance of iodine samplers under high relative humidity

Performance of an Improved Air Sampler for Collecting Airborne Radioiodine

JAEA's modeling studies on radionuclides transport in the terrestrial environment