Sodium flow and endurance test of "MONJU" dummy fuel; Subassembly of 6th test production

not registered; not registered; not registered; Iguchi, Tatsuro*

Sodium flow and endurance test for "MONJU" dummy fuel subassembly of the 6th test production (abbreviated name ,M6CWP) was carried out in Sodium Flow Test Loop. This test was performed for 2,384 hours with the inlet sodium temperature of 397C, the flow rate of 17.36 kg/sec and the cold trap temperature of 120C. The results of this test showed that; (1)The initial average pressure loss coefficient C of M6CWP was given by following equation. C = 113.58 Re. (2)In the measurement of total pressure, the increase of pressure loss became, to saturation at about 300 hours after the beginning of the test and finally approached to 3% larger than the initial value. (3)AS a result of the sodium draining conducted in accordance with the design condition for "MONJU" EVST (Ex-vessel Storage Tank), it was found that the sodium of about 90g remained in the subassembly. (4)The eye inspection of the subassembly after the test showed that the subassembly was intact without separation of fuel pins from knock bars. Since this was the final test for "MONJU" dummy fuel subassembly of test production, this report summarized the total pressure liss increase and various points concerning endurance found in the test series until now.