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PNC type in-sodium hydrogen meters have been developed as leak detectors for LMFBR MONJU steam generators. In order to confirm the long-term reliability and the durability of the meters, the four meters were installed in three sodium loops at the O-arai Engineering Center, and they had been tested over a long time in flowing sodium. A period of the test was from oct. 1977 to Feb. 1980. They are called type II. The dynamic chamber of the vacuum system can separate from the static one, and be also connected with it using one flexible tube. Important findings from the test are; (1) The operating time of two meters exceeded 10,000 hours, and the total of all meters was about 35,000 hours. No trouble had been experienced in the sodium systems and the nickel membranes of them during the period, which had the good durability. Air leaks, however, occured three times in the two vacuum systems. (2) Any secular changes had hardly happened in the permeability of hydrogen through the nickel membrane and the relationship between ion pump current and hydrogen pressure. (3) The pumping speeds had decreased with increasing the amount of absorbed hydrogen. The decreasing rates differed among four ion pumps, and those of two pumps were considerably large at the beginning of absorbing hydrogen. (4) The calibration curves, which describe the relationship between hydrogen concentration in sodium and ion pump current, had changed with time. The largest cause was the decrement of the pumping speeds. (5) The UHV gauges were superior to the ion pumps from the point of the signal-to-noise ratio as the hydrogen sensor.

JAEA Reports

Hydrogen Absorption by Zircaloy Cladding being Caused by Inner-Surface Oxidation

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JAERI-M 8497, 27 Pages, 1979/10

JAERI-M-8497.pdf:1.1MB

no abstracts in English

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Extraction of uranium(VI) and lanthanide(III) ions into supercritical carbon dioxide fluid containing -diketone and tributylphosphate

Supercritical CO $_{2}$ fluid leaching (SFL) of uranium from solid wastes using HNO $_{3}$ -TBP complex as a reactant

Effect of U(VI) concentration on equilibrium and kinetics in flow-extraction of U(VI) in HNO $_{3}$ /supercritical CO $_{2}$ +TBP system

New method for the removal of uranium from solid wastes with supercritical CO $_{2}$ medium containing HNO $_{3}$ -TBP complex

Modelling of the extraction of uranium with supercritical carbon dioxide

Solubility of organophosphorus metal extractants in supercritical carbon dioxide

Correlation between extraction equilibrium of uranium(VI) and density of CO $_{2}$ medium in a HNO $_{3}$ /supercritical CO $_{2}$ -tributyl phosphate system

Pressure-dependence of extraction equilibrium of uranium and plutonium ions in a HNO $_{3}$ /supercritical CO $_{2}$ -tributyl phosphate system

Electrical properties of rutile-tipe TiO $_{x}$ thin films prepared by ion beam assisted reactive deposition method

Extraction of uranium(VI) in nitric acid solution with supercritical carbon dioxide fluid containing tributylphosphate

Extraction of Uranium(VI) from nitric acid solution to supercritical carbon dioxide containing Tri-n-butylphosphate

Measurement of spatial and temporal distributions of the electron beam with optical transition radiation

Separation of geometric isomers of metal -diketonates by supercritical fluid chromatography

Determination of uranium in coated fuel particle compact by potassium fluoride fusion-gravimetric method

Determination of the long-lived nuclides in biological shielding concrete, ion exchange resine and fuel storage pool water of JPDR

Preparation of hafnium reference material JAERI-Z19

Rapid determination of hydrogen in lithium oxide by carbon monoxide carrier gas method

Preparation of Deuterium Target and Determination of Deuterium in the Target

Long-term endurance test of PNC Type in-sodium hydrogen meter; Studies of leak detector development on LMFBR's SG (2)

Hydrogen Absorption by Zircaloy Cladding being Caused by Inner-Surface Oxidation