Study of pressure dependence of permeability in hydrogen-nickel system to the design of hydrogen detector; Studies of small leak sodium-water reaction (9): Study report of 50 MWSGTF for sodium-water reaction (3)

Kanegae, Naomichi*; not registered; not registered; not registered; not registered; not registered; Hiyama, Kunihiko*; Takahashi, Tadao*

Generally, in the phenomena of hydrogen permeation or diffusion through nickel membrane, the relationship between the measured pressure P $_{rm IP}$ (pressure in vacuum side (mmHg)) and P $_{rm rm NH}$ (partial pressure of hydrogen in sodium (mmHg)) should be according half-power low, [P $_{rm IP}$ P $_{rm NH}$ $^{1/2}$ ] But some report indicated that the above equation is not realized, and the same phenomenon was also observed in our in-sodium experiments of the SWAT-2 and 50MWSGTF at PNC. This phenomenon is very important in the desigen detectors. An in gas experiment (range of P $_{NH}$ ; 10 $^{-4}$ 10 $^{2}$ mmHg, temperature; 5 stages of 216 $^{circ}$ C 505 $^{circ}$ C) was performed using the Nickel Membrane Ionpump Type Hydrogen Detectors (Thickness:0.25m, Area: 150cm $^{2}$ ) in the 50MW Steam Generator Test Facility of PNC, and empirical results for the pressure dependence effect on the permeability K that could be employed in the design of hydrogen detectors were obtained as follow, (1)When P $_{NH}$ 0.5 Torr, K is found to be independent of pressure and the temperature dependence is expressed as [K=k exp (-E/RT)] Where, K is a constant, R the gas constant, E the activation energy and T the temperature. (2) When P $_{NH}$ 0.5 Torr, permeability K $^{*}$ is expressed as [K $^{*}$ = Kb P $_{NH}$ $^{1/m}$ ] Where K is the same as above equation, b and m are constants. This indicates that the pressure dependence of pemeability in the low pressure range tends to be expressed by the Freundlich's adsorption isotherm equation. From the experiments, b and m are determined as follows (these were found to be independent of temperature): [b=1.25, m=2.8] (3) If the relationship between P $_{NH}$ and P $_{IF}$ is written as [P $_{IP}$ P $_{NH}$ $^{1/n}$ the combination of n and m yielde the following equation [ 1/n = 1/m + 1/2] The value of n was extracted from the data of in-sodium hydrogen detectors in SCTI, Phenix, PNC(SWAT-2,

Language	:	Japanese
Report No.	:	PNC TN941 76-29
Pages	:	55 Pages
Publication Year/Month	:	1976/03
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PDF	:	PNC-TN941-76-29.pdf:1.85MB
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Registration No. : GJ0919750127
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