Operating and Decommissioning Exper with Fast Reactors (IAEA

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The operating data and history of the JOYO MK-II core are shown in Table 2 and Fig. 3. The reactor operated for 48 000 hours and the integrated power generated was 4 400GWh. During the MK-II operation, 382 driver fuel subassemblies and approximately 47 000 fuel pins were irradiated. 0 GWd/t was attained for the MK-II driver fuel without any fuel pin failures. TABLE 2. JOYO MK-II OPERATING DATA Operation Time(Accumulated) Heat Generation(Accumulated) 48,000 hrs 4,400 GWh Max. Fuel Burn-up Driver Fuel 86 GWd/t Irrad.

9. This systematic discrepancy needs to be further investigated, but the change with cooling time appears to be due to the actinides’ decay heat uncertainty. Table 5 shows calculated and adjusted neutron flux and fluence. TABLE 5. 3. Reactor dosimetry Neutron Flux per Lethargy(n/cm2/s/Lethargy) The neutron flux calculation error rate was evaluated to be less than 5% in the fuel region according to the comparison between MAGI and reactor dosimetry test results (see Table 5). Figure 10 shows an example of adjusted neutron spectrum based on the foil activation method at the core center position of the MK-II.

2. e. neutron flux level, by adjusting the position of the control rod subassemblies in the core. This is a manual operation performed from the central control room. To improve operational reliability as well as to reduce the mental load on the operators, an automatic control rod operation system [16] has been developed. e. trend graphs of the thermal power, neutron flux and reactivity of the core. In actual operation, the operator’s actions in accordance with the above guidance should be conducted in a different manner depending on the reactor power level as described in Figure 23.

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