Development of SPEEDI-MP and its application to a hypothetical accident of a nuclear submarine in the Japan Sea

SPEEDI-MPの開発とその適用; 日本海における原子力潜水艦仮想沈没事故

小林 卓也 ; 永井 晴康  ; 茅野 政道; 外川 織彦 

Kobayashi, Takuya; Nagai, Haruyasu; Chino, Masamichi; Togawa, Orihiko

汚染物質の環境中における移行挙動を包括的に研究するツールであるSPEEDI-MP(Multi-model Package)を紹介し、その適用例として日本海における原子力潜水艦仮想沈没事故のシミュレーションを実施した。

The possibility of radionuclide release to the environment is on the increase due to a growth of nuclear facilities in Asia, military problems, nuclear terrorism, etc. The released radionuclides circulate among the atmospheric, oceanic and terrestrial environment, influencing human and natural environment through complex processes. In order to reduce the damage from these pollutants, it is necessary to estimate their migration behavior in detail. A software system SPEEDI-MP (SPEEDI Multi-model Package) is under development to resolve such environmental problems by simulating the 'inclusive and successive' behavior of pollutants in the atmospheric, oceanic and terrestrial environment. As code verification, the system has been applied to a hypothetical accident of a nuclear submarine if it sinks in an offshore region around Japan. The predicted results are examined, and the applicability and validity of the system are discussed.