BDI behavior evaluation of an upgraded Monju core and a demonstration core, 1; Plans for the out of pile bundle compressive tests for large diameter pins

Ichikawa, Shoichi; Haga, Hiroyuki; Katsuyama, Kozo ; Uwaba, Tomoyuki ; Maeda, Koji  ; Nishinoiri, Kenji

The life of FBR (Fast Breeder Reactor) fuel assembly is restricted by BDI (Bundle-Duct Interaction). Therefore, it is very important to carry out the out pile bundle compressive tests which can imitate BDI, in order to evaluate BDI behavior. The target of the conventional BDI behavior was thin pins ( 6.5 mm) for fuel pellets which were used with the assembly of Monju (the Monju prototype fast breeder reactor) etc. Furthermore by an upgraded Monju core and a demonstration core, adoption of thick pins for the holler annular pellets is planned. Therefore, it was necessary to carry out BDI evaluation of a thick pin. Then, the plans for out of pile bundle compressive test for large diameter pins were are reported this time.