JOPSS - Search Results

JAEA Reports

None

*; Fujiwara, Masayuki*

JNC TJ8430 2000-001, 55 Pages, 2000/03

JNC-TJ8430-2000-001.pdf:4.82MB

no abstracts in English

JAEA Reports

None

Fujita, Reiko*; *; Kondo, Naruhito*; Utsunomiya, Kazuhiro*

JNC TJ8420 2000-004, 41 Pages, 2000/03

JNC-TJ8420-2000-004.pdf:5.08MB

no abstracts in English

JAEA Reports

Physico-chemical studies on the disposal of miscellaneous radioactive waste through A single-step process (III)

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 $^{2+}$ / Cu $^{+}$ redox equilibrium experiments were carried out. Among the effect of various parameters on Cu $^{2+}$ / Cu $^{+}$ ratio in binary and ternary alkali sulfate melts, the effect of partial pressures of oxygen and SO $_{2}$ was mainly investigated in the study. Variation in Cu $^{2+}$ / Cu $^{+}$ ratio were presented as the function of partial pressures of oxygen and SO $_{2}$ , respectively. Possible thermodynamic interpretation were made on the experimental results. In addition, the dissolution of Cr $_{2}$ O $_{3}$ 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 Cr $_{2}$ O $_{3}$ for melts with same average ionic radius, in other words, oxygen ion activity, were essentially identical under constant temperature and atmosphere.

JAEA Reports

None

; ; ; ; ; ;

JNC TN8520 99-002, 56 Pages, 1999/04

JNC-TN8520-99-002.pdf:4.31MB

None

JAEA Reports

None

PNC TN1100 97-003, 114 Pages, 1997/03

PNC-TN1100-97-003.pdf:6.97MB

no abstracts in English

JAEA Reports

None

PNC TN1410 96-078, 581 Pages, 1996/12

PNC-TN1410-96-078.pdf:21.02MB

no abstracts in English

JAEA Reports

A study for leak testing in the fuel handling facility "JOYO"

Ito, Hideaki; ; ; Okubo, Toshiyuki

PNC TN9410 96-298, 177 Pages, 1996/11

PNC-TN9410-96-298.pdf:4.81MB

The fuel handling facility in "JOYO" must maintain an argon atmosphere and be gas tight; this prevents the oxidation of sodium adhering to a fuel assembly and leakage of radioactive gases. Periodic leak testing of the double O-ring gas seal had been performed at increasing pressure to assure its specified leak tightness. The problem with this method was that it took a long time to obtain an accurate measurement. The leak testing methods for the fuel handling facility, the reactor containment vessel, and other vessels were all reexamined. As a consequence, it was determined that alternative devices and methods for improving the leak rate measurements should be studied. Four methods of leak testing were evaluated; the present increasing pressure method, helium leak testing, decreasing pressure method, and a liquid nitrogen decreasing pressure method. A new automatic leak measurement device was used in these evaluations. The results of the utilization and limitations of the four methods of leak testing are summarized as follows. (1) The decreasing pressure leak testing method was efficient with regard to accuracy and stability for use in the fuel handling facility. (2) The automatic leak measurement device used a statistical calculation to measure the leak rate stability and it met the specified measurement requirements. (3) The leak rate measuring time was reduced by half with this new device and it could also simultaneously examine other objects.

JAEA Reports