TOTAL CASK ENGINEERING
OCL CORPORATION

Role of ”Cask” in Japan’s Nuclear Fuel Cycle

Benefits of Japan’s Nuclear Fuel Cycle
Japan is very poor in natural resources, relying on imports more than 90% of its primary energy resources. Uranium used in nuclear power generation is also relying on imports, but because its reserves are dispersed around the world, it is considered an energy source with better supply stability than oil resources.
Besides, the reprocessed uranium and plutonium from spent fuel are able to reuse at the nuclear power plants as semi-domestic energy resources.
In addition, the volume of high-level radioactive wastes are reduced to about one-fourth by reprocessing spent fuel compared to direct disposal, so the area of the disposal facility can be greatly reduced.
Role of ”Cask” in Nuclear Fuel Cycle
Spent fuels radiate strong radioactive and heat because it contains radioactive material produced during uranium fission in a nuclear reactor. Prior to transportation, spent fuels undergo a cooling process in water pools at nuclear power plants over a set period which is designed to decrease the radioactivity and decay heat. Then, transport cask for spent fuels protectively confine such contents. The casks are designed to shield radiation, remove heat and prevent nuclear criticality. These capabilities are bolstered by their extreme heavy-duty construction, with their weight of between 70 to 100 tons.
Casks will be an important item for the safe and efficient realization of Japan’s nuclear fuel cycle because casks are used not only for transport from nuclear power plants to reprocessing plants but also for transport and storage to interim storage facility or for transport of MOX fuel after reprocessing.
原子燃料サイクル概念図

Total Cask Engineering

Our Business

Since establishment, we own six HZ-75T type casks that were the first practical use in Japan, and engaged in leasing business to Japan’s electric power companies. We have accumulated technology as a ”TOTAL CASK ENGINEERING” company through operations such as ”research · study, design · analysis, fabrication control, maintenance management”.

We provide accumulated total cask engineering by proven achievement and experience, and will continue to contribute for safety transportation of spent fuels.

Besides, Since needs for cask that is used interim storage and MOX fuel transport increase in domestic, we will work on development of cask and handling tool related these project.

We will improve technical capabilities and continue to contribute in order to realize safe and efficient nuclear fuel cycle.

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