The Prototype fast breeder reactor Monju system startup tests report; Summary report of the system startup tests; Criticality test Power up test(40% power)

Miyakawa, Akira; Hattori, Kazuhiro; Jo, Takahisa

JNC TN2410 2005-002, 278 Pages, 2005/07

JNC-TN2410-2005-002.pdf:30.04MB

In December, 1992, the performance tests (System Startup Tests; SST) of Monju had been started after the integrated function tests. However, coolant leakage in secondary heat transport system occurred at 8th December, 1995. And so, the performance test was interrupted at the stage of the plant output about 40%. Then, it is also in a plant stop state now.In SST, the plant data was measured in all each stage of reactor power from fuel loading to rated power. And, based on the measurement data, the check of the system performance, the evaluation of appropriate design, and the consolidation of the measurement data for future etc. were carried out. There were about 130 test items in SST, 2/3 items of total were indispensable to starting of a plant (these are equivalent to starting test items of LWR), 1/3 items were R&D. Here, summary of past performance test result are organized.

Polyamorphism in tin tetraiodide

Fuchizaki, Kazuhiro*; Sakagami, Takahiro*; Miyauchi, Arata*; Hamaya, Nozomu*; Hattori, Takanori; Katayama, Yoshinori

no journal, , 

The results of the synchrotron X-ray diffraction on liquid SnI revealed the following characteristics on the phase transformation between low- and high-density liquids. (1) The local structure continuously changes with pressure. (2) The density shows no systematic change with pressure. The first one is confirmed by the continous pressure-induced change of off-tetragonalinity in the local structure. On the other hand, the second statement is still less convincible because it based on the indirect method to measure liquid density. To confirm the second statement, the direct measurement of the liquid density is necessary. For that purpose, we determined density from X-ray absorption of liquid sample. The results showed that the liquid density slightly jumps by the amount of 0.3 g/cc at 1.5 GPa, where the PT-melting curve shows a knick. Now we are trying to reveal the details based on more accurate data.