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Shirayama, S.*; Nozaki, S.*
PNC TJ201 74-28, 10 Pages, 1974/10
The in-core fission chamber for LMFBR is under development. The latest model of the detector developed in 1973 was 10 mm. It is successfully operating at KNK. Development efforts are now focussed on smaller size detector, suitable as a JOYO mark II fuel assembly for an instrumented fuel assembly. Two of the smaller size detectors were designed and fabricated for performance testing. Tests were conducted under conditions of 600C, 10 nv thermal neutron flux. The trial operation tests on a thermal research reactor are satisfactory.