Title :
Performance of Fuel Failure Detection System for Coated Particle Fuels
Author :
Terada, H. ; Wakayama, N. ; Ohkawa, H. ; Ohtsu, H. ; Yoshida, H.
Author_Institution :
Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken, 319-11, Japan
fDate :
4/1/1985 12:00:00 AM
Abstract :
An experimental system was developed for a study of fuel failure detection (FFD) method for coated particle fuels (CPF´s) of a high-temperature gas-cooled reactor. Various performances of the FFD-system were examined using a CPF-irradiation rig in the Japan Material Testing Reactor. By experiments, it was made sure that the counting rates of fission products (FP´s), released from the CPF´s, change with the reactor-power and the fuel-temperature remarkably even during the normal reactor operation. Also, an ability of the selective detection of only short-life FP-nuclides was studied in relation to the travelling time of the sampling gas. The results showed that the contributions of the short-life FP-nuclides such as Kr-89 and Kr-90 are more than 80 percent to the total FP-counting rate at the shortest travelling time of 120 sec. It is concluded that the selective detection of only the short-life FP-nuclides can be realized by controlling the travelling time properly.
Keywords :
Coolants; Equations; Fuels; Helium; Inductors; Isotopes; Materials testing; Performance evaluation; Sampling methods; Temperature;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1985.4333576