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Analyses are concentrated on the circumferential temperature distribution on the cladding outer surface because the Maximum Cladding Surface Temperature (MCST) has been a crucial design parameter to evaluate fuel cladding integrity of the Super Fast Reactor.
Maximum cladding surface temperature at nominal condition is evaluated to be 645.3 °C over the cycle.
Four types of the limiting fuel rods, individually with the Maximum Cladding Surface Temperature (MCST), Maximum Power Peak (MPP), Maximum Discharge Burnup (MDB) and Different Coolant Flow Pattern (DCFP), are chosen to cover all the fuel rods in the core.
The results indicate that the maximum cladding surface temperatures (MCST), which is the most important safety criterion, of the both passes in the mentioned incidents are all below the safety criterion by a large margin.
Axial fuel enrichment is zoned into three regions to control axial power peak, which might affect maximum cladding surface temperature.
The maximum cladding surface temperature over the long cycle is found at the BOC due to its high peaking factor.
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The maximum clad surface temperature has been predicted in different cases by using the thermal hydraulic safety code RELAP5/Mod4.0.
The maximum clad surface temperature for the original design was calculated to be very high, so some improvements in the channel design have also been proposed in this study.
The paper shows the elaborated hot channel calculation methodology by analyzing an ATWS event of a Russian designed pressurized water reactor (VVER-440) and the results of conservative vs. uncertainty analysis are compared with regard to the number of failed fuel rods, the maximum clad surface temperature and the maximum fuel temperature.
The results show that the maximum cladding-surface temperature of CANFLEX bundle is 804.1 °C, which is below the limit of design, and it is appropriate for use in the CANDU super-critical water-cooled reactor (SCWR) based on heat-transfer analysis.
The maximum cladding temperature, the maximum fuel center temperature and the maximum coolant velocity are all below the design constraints.
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