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Report No.
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Experimental data on DCA core(27); Critical experiments of the cores with aseismatic plates

not registered; Takemura, Morio*; not registered; not registered; Fukumura, Nobuo*

Critical experiments on DCA cores with aseismatic plates have been done in order to clarify the value of the reactivity worth of aseismatic plate and the behavior of the detailed power distribution or the thermal neutron flux distribution around the aseismatic plate. The aseismatic plate was arranged in the heavy water moderator of the nine central channel region of the DCA core. The thickness of the plate is 5mm, 20mm, 40mm or 80mm. The axial position of the plate was a half of critical heavy water level. The DCA core has a 25cm square lattice pitch and 97 fuel clusters with 1.2w/o uranium enrichments. The heavy water includes $$^{10}$$B($$sim$$3ppm). The coolant is light water. The reactivity worth of the plate was measured by use of the critical heavy water level between the cores with and without the plate. Axial power distribution was obtained by measuring the $$gamma$$-ray intensity of the typical fission product ($$^{140}$$La) of irradiated fuel rods. Axial thermal neutron flux distribution was obtained by measuring the activities of irradiated copper wires inserted in the central fuel channel or the moderator regions with and without the plate. The followings are found from the present experiments. (1)The reactivity worth of the aseismatic plate is monotonously increasing with the increase of the thickness of the plate. The values obtained by the present experiments change from about 0.1% $$Delta$$K to 1% $$delta$$K. (2)The axial power distribution depression by the plate with a 40mm thickness in the fuel cluster is increasing toward the outer from the inner in the fuel cluster. The value of the ratio of the depression to the maximum power is about 5% in the inner rod and about 10% in the outer rod. (3)The depression of the thermal neutron flux distribution around the plate in the moderator or in the fuel channel is increasing with increase of the plate thickness. The obtained value of the depression for the core with a 40mm thickness plate is ...

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