Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Nakagiri, Toshio; Kato, Kazunori*; Miyahara, Shinya
JNC TN9400 2003-069, 181 Pages, 2003/07
JNC-TN9400-2003-069.pdf:3.96MB
Experiments were carried out to study the release behavior of iodine and cesium with sodium and their mixed aerosol behabior during sodium pool combustion. The experimental results were compared with calculated results by computer codes (SPM code and ABC-INTG code). The following results were obtained from this study.(1) The measured release rates of sodium, cesium and iodine release rate during sodium combustion increased with sodium temperature rise. The calculated release rates by the SPM code did not depend on sodium pool temperature clearly as measured values.(2) Retention factors of cesium and iodine to sodium pool during sodium combustion were larger than those in equilibrium evaporation.(3) Mass concentration of cesium and iodine in sodium aerosol were nearly constant, and it was confirmed that sodium-volatile FPs mixed aerosol can be treated as single component aerosol.(4) The generation of gaseous iodine was not confirmed in this experimental series. However, the possibility of gaseous iodine generation was indicated by thermodynamical analysis, and it was found that past test results were qualitatively explained.
Futagami, Satoshi; Ohno, Shuji; Kato, Kazunori*
JNC TN9400 2003-067, 168 Pages, 2003/06
JNC-TN9400-2003-067.pdf:13.7MB
Since 1998, the test (Run-F7 series) was performed to acquire the fundamental knowledge about the sodium pool growth and floor liner temperature in the case of small-scale leakage of sodium. And the test (Run-F8 series) was performed to know the floor liner material corrosion mechanism under high moisture conditions. In both test series, those influences are investigated by making the rate of sodium leakage, and moisture conditions of supply air into main parameters. As the last test, (1)Run-F7-4 (June 28, 2000) and (2)Run-F8-2 (January 26, 2000) were carried out. The conclusion of the following which receives sodium small-scale leakage (about 10 kg/h) was obtained from these experiments and the result of old Run-F7 and Run-F8 series. - The peak temperature of a catch pan tends to become lower with decrease of sodium leak rate. Moreover, height of leak point and moisture conditions also become the factor which raises the catch pan peak temperature. - Although it grows up in proportion [almost] to time in early stages of leakage about growth of a sodium pool, growth stops during the leakage. Moreover, the final growth area is mostly proportional to the rate of sodium leakage. - It was suggested by the measured value of catch pan corrosion thickness and a material analysis result that the dominant corrosion mechanism was relatively slow `Na-Fe double oxidization type corrosion` even under the high moisture condition of 4.6 to 4.8%. And the chemical analysis result of a deposit also suggested that the catch pan material was in the environment in which `molten salt type corrosion` was not easy to occur.