Investigation of beam window structure for accelerator driven system; Simplified overall integrity assessment and detailed assessment on buckling

Sugawara, Takanori  ; Suzuki, Kazuhiko; Nishihara, Kenji  ; Sasa, Toshinobu   ; Kurata, Yuji; Kikuchi, Kenji; Oigawa, Hiroyuki 

The design acceptance of the beam window which is one of the most critical components for the Accelerator Driven System (ADS) was investigated. From the simplified overall assessment for nuclear power plant, it was clarified that the buckling failure was the most severe failure mode for the beam window. The parametric survey for the thickness of the ellipse model was carried out to prevent the buckling failure by using the Finite Element Method code, FINAS. The buckling analyses with initial imperfections were also performed to discuss the factor of safety (FS). The results showed that FS of 3 was enough conservative to ensure the integrity of the beam window. It was also shown that the ellipse shape concepts with the thickness of 2.02.4 [mm] at the top and the thickness of 2.04.0 [mm] at the transient part were acceptable under the current ADS design parameters.