According to one embodiment, a nonvolatile memory device includes a substrate, a first electrode, a second electrode, and a memory. The hanger has a clip with a jaw which can be opened by a user pressing with one hand on the clip. The prediction of crud deposition enables generation of the loading pattern and design of lattice structures for the fuel assemblies that results in the reduction of total crud deposition in the reactor core and causes a substantially uniform crud deposition on the fuel assemblies of the reactor core. The first control mechanism controls so as to perform a scanning operation for scanning each block of the plurality of block registers and a search operation for searching a block having a valid coefficient.