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Report No.
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Design of fuel assembly for an efficiency test of FBR fuel

not registered; Morii, Tadashi*; not registered; not registered; not registered; not registered; Kinjo, Hidehito*

In the experimental fast reactor JOYO, two new tests programs are scheduled in near future in order to verify high-power and high-burnup capability of LMFBR fuel pins : PTM(Power-to-Melt) test and RTCB(Run-to-Cladding Breach) test. A study is performed for the license of the tests. In this study, the fuel assemblies for the PTM and RTCB tests is designed, Safety assessment for the possible events occurred in the course of the tests, namely melt of sample fuel (PTM test) and cladding breach (RTCB test) is performed. Lastly, safety assessment for the accidents occurred in the course of the tests is also performed to obtain a license. As for the PTM test, the fuel assembly is designed considering thermal expansion of fuel pins and designed in order to prevent local blockage caused by released sample fuel and hold the released fuel within the assembly in preparations for the worst case of pin failure. The effect of reactivity insert by fuel slumping and pellet-cladding mechanical interaction caused by fuel melt within the test pin occurred during the PTM test is studied to show an integrity of the test pins. Analytical results show an integrity of test pins under the conditions with superposition of anticipated transient whose possibility of occurrence is relatively high. Lastly, even if the test pin is breached to release sample fuel, the calculated radiation dose to population is shown to be sufficiently lower than the limited values. As for the RTCB test, the devices are proposed to lower the released rate of FP gas and prevent an adjacent pin failure caused by the released gas in the cource of the test. Analytical results for the event of gas impingement on the adjacent spare pins show no additional breach of those pins. Calculated results with superposition of the representative anticipated transients and accidents also show an integrity of the adjacent spare pins. The released radio-activities calculated for the above events are sufficient smaller ...

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