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Report No.

Effective multiplication factor measurement by Feynman-$alpha method (3)

Mori, Tomoaki; not registered

The sub-criticality monitoring system has been developed for criticality safety control in nuclear fuel handling plants. In the past experiments performed with the Deuterium Critical Assembly(DCA), it was confirmed that the detection of sub-criticality was possible to k$$_{eff}$$=0.3. To investigate the applicability of the method to more generalized system, experiments were performed in the light-water-moderated system of the modified DCA core. From these experiments, it was confirmed that the prompt decay constant($$alpha$$), which was a index of the sub-criticality, was detected between k$$_{eff}$$=0.623 and k$$_{eff}$$ 0.870 and the difference of 0.05$$sim$$0.1$$Delta$$k could be distinguished. The $$alpha$$ values were numerically calculated with 2D transport code TWODANT and monte carlo code KENO V.a, and the results were compared with the measured values. The differences between calculated and measured values were proved to be less than 13%, which was sufficient accuracy in the sub-criticality monitoring system. It was confirmed that Feynman-$$alpha$$ method was applicable to sub-critical measurement of the light-water-moderated system.



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