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Iwase, Masanori*
JNC TJ8400 2000-063, 78 Pages, 2000/03
JNC-TJ8400-2000-063.pdf:1.93MB
This study is aimed at controlling oxidation reaction of molten metal by ash in incineration systems, and at positively utilizing the oxidation reaction for decontamination of slag. In this year, in order to investigate physico-chemical properties of mixed fused salt containing alkali sulfates, with special focus on the behaviour of oxygen anion in the melts, Cu
/ Cu
redox equilibrium experiments were carried out. Among the effect of various parameters on Cu / Cu ratio in binary and ternary alkali sulfate melts, the effect of partial pressures of oxygen and SO
was mainly investigated in the study. Variation in Cu / Cu ratio were presented as the function of partial pressures of oxygen and SO, respectively. Possible thermodynamic interpretation were made on the experimental results. In addition, the dissolution of CrO
in mixed alkali sulfates were also investigated as a first step to elucidate the mechanism of hot corrosion. With this investigation, an important finding was obtained that the solubility of CrO for melts with same average ionic radius, in other words, oxygen ion activity, were essentially identical under constant temperature and atmosphere.
/supercritical CO-tributyl phosphate systemMeguro, Yoshihiro; ; *; Takeishi, Hideyo; Sasaki, Takayuki*; Yoshida, Zenko
Proc. of Int. Trace Analysis Symp. '98 (ITAS'98), p.25 - 26, 1998/00
no abstracts in English
Fukui, Yasutaka; ; Tanimoto, Kenichi; Terunuma, Seiichi
PNC TN9410 94-033, 86 Pages, 1994/01
It is must deceasse the pool risk for the radio active wastes. So it is necessary to decontaminate the wastes low level 
(
500
Sv/h) during control the secendry wastes. Exfoliation velocity (aria of exfoliated paint per unit time) was measured on various cndition changed parameter brasting pressure, feed rate, stand off distance between nozzle and waste surface, angle of nozzle, therefore most suitable condition for decontamination was decide on high-pressure ice brasting method, results are as follows. (1)Feeding dry-ice pellets of most suitable condition was decided on that brasting pressure is 15Kgf/cm
, feed rate is 30%. Same exfolation ability was gained on condition that brasting pressure is 15Kgf/cm, feed rate is 50%. (2)Brasting dry-ice flow of most suitable condition was dicided on that stand off distance is between 50㎜ and 100㎜ angle of nozzle is 30
with vertical. (3)In case of a pipe form, exfolation ability was gained on condition that angle of nozzle is 60 with vertical after the waste was settled on the turn-table and turning. In case of angle iron form, on condition that angle of nozzle was 0 or 60 with vertical. In case of inner can on condition that angle of nozzle was 45 with axis. When these were such small parts as bolts in the barrel basket which leand 30 with vertical and turned 120rpm, exfolation ability was gained on condition that angle of nozzle was vertical. (4)In decontamination hood designing, negative pressure was maintaind in the cell, and freeze preventing heat capacity of ventilation filter (-78C) was calculated at 73kw.
Nakamura, Takuya; Hirata, Kazuhiro*; Yamanishi, Toshihiko; Okuno, Kenji; Naruse, Yuji
Fusion Technology, 21(2P2), p.942 - 947, 1992/03
Times Cited Count：2 Percentile：27.46(Nuclear Science & Technology)no abstracts in English
Tanabe, Hiromi; Hamada, Hirotsugu
PNC TN9410 91-028, 14 Pages, 1991/01
A COMPUTER CODE,SWACS,WAS DEVELOPED TO ANALYZE A LARGE LEAK SODIUM-WATER REACTION EVENT IN AN LMFBR STEAM GENERATOR. THE JAPANESE PROTOTYPE REACTOR,MONJU,HAS A COVER GAS SPACE IN ITS STEAM GENERATOR BUT DIFFERENT DESIGNS ARE ALSOCONSIDERED FOR A FUTURE LARGER PLANT. THEREFORE,SWACS WAS MODIFIED TO ANALYZE THESODIUM-WATER REACTION EVENT UNDER SUCH VARIOUS DESIGNS. SO FAR THE CALCULATIONALMODULE OF AN INITIAL SPIKE PRESSURE AND ITS PROPAGATION TO IHTS WAS IMPROVED AND THERESULTS WERE COMPARED WITH THE DATA FROM LLTR AT ETEC, U.S.A. AND WATER-EXPLOSIVE SIMULATION TESTS AT PNC,JAPAN. THE COMPARISON REVEALED A FAIRLY GOODAGREEMENT BETWEEN THE TESTS AND THE ANALYSES. FOLLOWING THE VALIDATION STUDY,SWACS WAS USED FOR THE APPLICATION ANALYSIS TO COMPARE THE PRESSURE BEHAVIORBETWEEN THE COVER-GAS TYPE AND THE NO-COVER-GAS TYPE STEAM GENERATOR OF A FUTURELARGER PLANT. THE ANALYSIS CLARIFIED THE APPLICABILITY OF SWACS TO SUCH A DESIGN STUDYFROM A VIEWPOINT OF SUPPRESSING THE SWR PRESSURE.
; *
PNC TN241 83-10, 229 Pages, 1983/07
Sodium spray fire experiments using a 21 m
vessel were Performed in order to validate the computer code SPRAY-III. The results of precalculations has been reported in a preceding report, Sodium Spray Fire Analysis. In this study, the validation of SPRAY-III was conducted using the experimental results and the accuracy of calculated results was discussed. The following results were obtained: (1)study under inert gas atmosphere. (a)The peak pressure and temperature obtained by the analysis overestimate the experimental results. But the calculated pressure rose monotonically till the termination of spray injection and it was different from the experimental peak which appeared during the injection. The rise rates of pressure and temperature in analyses were lower than those in experiments. (b)The calculated temperatures of the steel wall liner were only about 55 to 75 % of the experimental values at the end of sodium injection. But the comparison between analysis and experiment with regard to the temperature of mortar wall showed a fairly good agreement. (c)The averaged pool temperature at the end of sodium injection was found to be slightly lower in analysis than in experiment. The analysis shows that the heat transfer between the pool and the gases hardly affects the results during sodium injection. (2)Study under air atmosphere. (a)When all reaction products were assumed to be peroxide in the same manner as in the safety analysis of Monju, the increase rates of both the pressure and the temperature as well as their peak values were found to be underestimation. Hence to obtain conservative results in this 21 m vessel, an increase in the rate constant of reaction with oxygen (Vo from 300 to 1000 ft/sec) must be assumed. However, this value should be investigated in the near future for application to the safety analysis of Monju. (b)The comparison between analysis and experiment with regard to the temperature of the mortar showed a fairly good agreement. ..
