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Establishment of the experimental equation of state for nuclear fuel materials at ultra-high temperature and pressure which correspond to hypothetical reactor excursion is a final target of this series of work. The dynamic method for this purpose must be developed since we have no available data for the extreme conditions. In this report, examination for the validity of the dynamic method and there search for the temperature measurement of UO $_{2}$ vapor are described as a preliminary study. Considerations for the thermodynamical properties of high temperature states of UO $_{2}$ are also made. About 40 Mwatts giant pulse laser is irradiated on the surface of UO $_{2}$ sample for the generation of the vapor by intense heating. The vapor ejection pressure is determined from the torsion pendulum and pressure transducer with varying their radiated area. The maximum and minimum values of the pressure are about 1,700 and 20-atm, which correspond to the energy density of 1.110 $^{10}$ and 410 $^{8}$ joules/cm $^{2}$ sec, respectively.

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Japanese contributions to IAEA INTOR Workshop,Phase two A,Part 3; Chapter VI: Electromagnetics

INTOR Scoping study; Conceptual design study of FY86 FER

Development of tokamak reactor system analysis code NEW-TORSAC

Development of tokamak reactor automated design code TRADE

Development of Tokamak Reactor Systems Analysis Code "TORSAC"

Japanese Contributions to IAEA INTOR Workshop,PhaseIIA,Part 2 Chapter V:Transient Electromagnetics

Japanese Contributions to the Japan-US Workshop on FER/ETR Design; Exchange Q-16 in the Japan-US Fusion Cooperation Program,March 2630,1984

Observation of Very Dense and Cold Divertor Plasma in Beam Heated Doublet III Tokamak With Single-Null Poloidal Divertor

Preliminary study of fuel melt down