2021 Volume 70 Issue 12 Pages 416-420
The fuel assembly stored in the spent fuel pool （SFP） of Fukushima Daiichi Nuclear Power Station Units 1 to 4 at the time of the Great East Japan Earthquake is in an unusual environment due to the contamination of rubble generated by seawater injection and damage to the building. It has a history. Therefore, in order to store spent fuel extracted from SFP for a long period of time in the service pool, it is essential to evaluate the effect of their environmental history on the health of fuel assemblies. It was evaluated that the soundness of the fuel assembly was maintained from the viewpoint of structural integrity and cladding tube tightness.
