[en] Purpose: To simplify the structure and facilitate the control for heat exchanging efficiency of a divertor using liquid metals. Constitution: In a divertor disposed at the inlet of an exhaust duct disposed to the opening of a plasma-confining blanket, liquid metals forming neutralizing portion with free surface and electrodes are contained within a pool divided in the toroidal direction. Charged particles are neutralized satisfactorily for a long period of time with the free surface of the liquid metals such as Pb or Li, while the liquid metals passing through cooling pipeways are removed with heat. Further, by supplying an electrical current between electrodes in the pool, eddy currents caused by the interaction with the magnetic field of the thermonuclear device causes positive convections to conduct heat removal satisfactorily. It is possible to optionally control the heat removing efficiency by adjusting the value of the current. (Kamimura, M.)

[en] Purpose: To optimize the configuration of the poloidal coils to facilitate replacement of blankets and limiters. Constitution: In a bell jar structure, the outer poloidal coils installed on the outer side of the bell jar structure and on the outer side of the inner poloidal coils installed on the outer side of the vacuum vessel, are installed in the cryostat. The outer poloidal coils are placed in the area through which blanket etc. are removed. These coils are placed close to the position at which the most effective poloidal magnetic field for toras plasma confinement will be created. This allows the outer poloidal coils to be placed in the optimum position and poloidal magnetic field is generated effectively to make the plasma more uniform and at the same time the poloidal coil power supply can also be cut. Moreover, blankets etc. can also be replaced easily. (Yoshihara, H.)

[en] Purpose: To control the temperature of the breeding material within an allowable temperature range with ease by determining the cross sectional area of a breeding blanket, number of cooling pipes corresponding to the heat generating distribution and the pipeway distribution. Constitution: To the inside of a shell for an outer blanket module constituting the breeding blanket of a thermonuclear device having a torus type plasma-confining vessel, cooling pipes are disposed vertically such that those pipes situating on the blanket center nearer to the plasmas are arranged in a closer pitch. Then, tritium breeding material is filled between the pipes. Coolant flowing gaps in communication with the cooling pipes are disposed to the inside of double-walled ribs for partitioning the inside of the shell into a plurality of parts along the poroidal direction. (Seki, T.)

[en] Purpose: To avoid the reduction of tritium breeding ratio in the breeding blanket disposed within a range screened by an impurity removing neutralizing plate and a support therefore, in a impurity removing device such as limiter or diverter. Constitution: A breeding blanket and an impurity removing device for exhausting helium in a plasmas out of the reactor are disposed within the torus type vacuum container. The impurity removing device comprises a diverter plate, a support plate and a neutron breeding material such as of lead or beryllium plate disposed on the surface of the support plate. Thus, since neutrons generated in plasmas are bred by the neutron breeding material before the support plate for supporting the neutralizing plate, many neutrons enter the breeding blanket to improve the tritium breeding ratio therein. (Horiuchi, T.)

[en] Purpose: To prevent loss of cooling effect over the entire torus structure directly after accidental toubles in a cooling device of a thermonuclear device. Constitution: Coolant recycling means of a cooling device comprises two systems, which are alternately connected with in-flow pipeways and exit pipeways of adjacent modules. The modules are cooled by way of the in-flow pipeways and the exist pipeways connected to the respective modules by means of the coolant recycling means corresponding to the respective modules. So long as one of the coolant recycling means is kept operative, since every one other modules of the torus structure is still kept cooled, the heat generated from the module put therebetween, for which the coolant recycling is interrupted, is removed by means of heat conduction or radiation from the module for which the cooling is kept continued. No back-up emergency cooling system is required and it can provide high economic reliability. (Kamimura, M.)

[en] Purpose: To prevent structure material meltdown upon rupture of cooling pipeways in a impurity remover by preventing the coolants from flowing into the vacuum vessel while continuing the supply of coolants to other portions to be cooled. Constitution: Dual cooling pipeway systems are disposed to the neutralizing plates of the impurity remover. A rupture detector (pressure gage) is mounted to each of the cooling pipeways and flow rate control valves to be opened and closed by the signal from the detector are disposed to the upstream and downstream of the cooling pipeway. In this constitution if the cooling pipes should be ruptured, the coolant supply is stopped to the ruptured system in which the flow rate valve is closed by the signal from the rupture detector. However, since the coolant is kept to be supplied to the other system of the cooling pipeways, meltdown of the neutralizing plates can be prevented. (Kamimura, M.)

[en] Only blanket contents inserted in a blanket vessel are exchanged without moving a blanket device disposed in the inside of a vacuum vessel of a thermonuclear reactor. Further, the blanket device is moved after discharging the contents. Alternately, only the blanket contents charged in blanket pipes in the blanket vessel are exchanged. If the blanket contents are determined as plurality spheres, they can be inserted and discharged smoothly by their own weight, and since they have a large surface area, satisfactory cooling effect can be provided. The blanket contents are made of metal oxides or liquid metals to increase a filling rate and make the handling upon insertion and discharge. They are circulated in the inner and the outer sides of the blanket to make cooling effect satisfactory. Since the exchange of various kinds of blanket contents is made simple and convenient, recovery and change for the function of the blanket device can be conducted rapidly, so that operation for the exchange due to failures is also easy to greatly save the operation steps. (N.H.)

[en] The present invention concerns a vacuum exhaust duct used for a thermonuclear device. A cylindrical metal liners is lined with a gap to the inside of a vacuum exhaust duct main body. Bellows are connected to both ends of the metal liners and the end of the bellows is welded to the vacuum exhaust duct main body. Futher, a heater is mounted to the metal liner on the side of the vacuum exhaust duct main body, and the metal liner is heated by the heater to conduct baking for the vacuum exhaust duct main body. Accordingly, since there is no requirement for elevating the temperature of the vacuum exhaust duct upon conducting baking, the vacuum exhaust duct scarcely suffers substantial deformation due to heat expansion. Further, there is also no substantial deformation for the bellows disposed between the outer circumference of the vacuum vessel and a portion of a vacuum exhaust duct, so that the durability of the bellows is greatly improved. (I.S.)

[en] Purpose: To enable to maintain the temperature distribution in a charged layer of a blanket easily within a temperature range set by the design. Constitution: The cooling pipeway comprises inner cooling pipes for flowing coolants composed of water and outer cooling pipes surrounding the inner cooling pipes with a gap. Thus, the gap size between the inner and outer cooling pipes in this cooling pipeway is decreased in the direction toward reactor core plasmas. Specifically, the inner cooling pipe is disposed eccentrically within the outer cooling pipe toward the reactor core plasmas by from 0.2 to 1 mm. With a such constitution, the temperature distribution in the charged layer can be maintained with ease within a temperature range set by the design. (Horiuchi, T.)

[en] To conduct stable tritium breeding by always maintaining a required temperature difference between coolant pipeways through whch coolants are circulated and tritium breeding material. That is, outer pipeways are disposed at a gap to the outer circumference of cooling pipeways for cooling the blanket. Wires are wound around spirally along the outer circumference of the cooling pipeways for surely maintaining the gap between the outer pipeways and cooling pipeways. Accordingly, it is possible to surely maintain a required temperature difference between the cooling pipeways and the breeding material. As a result, it is possible to stabilize the tritium breeding. (I.S.)