钴调节棒转运容器屏蔽研究

Shielding Research of Cobalt Adjuster Rod Transport Cask

采用MCAM程序与MCNP程序模拟计算钴调节棒转运容器的表面剂量率,并以此来判断容器的屏蔽设计是否满足标准要求。通过程序系统估算,在容器初始设计模型的基础上将5 cm铅层替换为5cm贫铀防护层,并提出了在容器下部屏蔽门缝隙处增加临时屏蔽装置以降低该处的辐射水平。经过优化设计后,钴调节棒转运容器能够满足国家相应的屏蔽标准要求。现场操作时的实测结果也进一步验证了容器屏蔽设计的合理性和可靠性。

Dose rates at the surface of adjuster rod transport cask were calculated with MCNP code and MCAM code. The calculation results were compared with national standard to estimate shielding design of the cask. To meet the requirement of the standard, original design of the cask was updated through the calculation of these codes. To reduce the radiation level, temporary shielding for the gap （between shielding door and main cask） was applied and 5 cm shielding layer of depleted uranium was applied to the side shield instead of 5 cm lead layer. According to the results, new shielding design of transport cask can meet the national standard. The measuring results show that the design of the cask is reasonable and reliable.