[2D05-09] Accident-tolerant Fuel 2

[2D05] The feasibility study on SiC composite fuel cladding for the Accident Tolerant Fuel to the existing PWR plants

(5) Evaluation of influence on core neutronics characteristics and fuel behavior

*Nozomu Murakami¹, Kazuki Kirimura¹, Kazuya Yamaji¹, Daisuke Sato¹, Seiichi Watanabe², Daiki Sato², Kenichiro Furumoto², Shinichiro Yamashita³, Tokio Fukahori³ (1. MHI, 2. MNF, 3. JAEA)

Keywords:Light Water Reactor, Safety Improvement, Accident Tolerant, Fuel Cladding, SiC

SiC cladding characteristics and behaviors (Lower thermal conductivity of SiC cladding than that of Zr-based cladding and so on) cause fuel temperature to increase, and consequently to decrease reactor Shutdown margin (SDM). As a result of this study, smaller fuel rod diameter with hollow pellet is one of the solutions to maintain current level of SDM.