[1H01-08] 溶融物挙動1

[1H05] Advanced Multi-Scale Modeling and Experimental Tests on Fuel Degradation in Severe Accident Conditions (1)

(No.5) Model of reaction between control rod and channel box

*Pham Hai¹、Matsuura Suguru²、Nakajima Shotaro²、Nanko Makoto²、Nagae Yuji¹、Kurata Masaki¹ (1. JAEA、2. Nagaoka Univ. Tech.)

キーワード：lost-of-coolant accident、zircaloy、control blade、fuel assembly degradation

In this study, soaking experiments of pre-oxidized zry plates in molten mixture of stainless steel and 5 mol% boron carbide were conducted at 1200-1250°C. Thickness of oxide layer, ZrO₂ was measured before and after the soaking test to investigate the ZrO₂ thickness recession in the molten mixture. Results of the study indicated that the thickness recession of ZrO₂ was mainly caused by the diffusion of oxygen from oxide layer to metallic-Zr region.