Several design challenges for the realization of a compact sodium-cooled B&BR for recycling PWRs spent nuclear fuel have been characterized from the neutronics perspective. One of the design challenges is a high excess reactivity particularly during the transition of the active core from the initial core to the blanket region. A concave zirconium zoning initial core has been found as a practical solution to address the high excess reactivity. By zoning the core, the radial power distribution can also be flattened. In this work, the zirconium zoning was first applied to the initial core and then applied further to the blanket region of B&BR. The reactivity evolution and power distribution were compared and analysed to achieve the design target and to understand the underlying physics. The neutronics analysis is performed using the Monte Carlo code McCARD with the ENDF/B-7.0 library.
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机译：用于实现紧凑型钠冷却的B＆BR用于回收PWR的几种设计挑战已经从中霉的角度表征了核燃料。其中一个设计挑战是高度过剩的反应性，特别是在从初始芯的初始芯转换到毯子区域的过程中。已经发现凹锆区分区初始核心作为解决高度过剩的反应性的实用解决方案。通过分区核心，径向配电也可以扁平。在这项工作中，首先将锆分区施加到初始芯中，然后进一步施加到B＆B的毯子区域。比较和分析反应性进化和配电，以实现设计目标并理解潜在物理学。使用Endf / B-7.0库使用Monte Carlo Code Mccard进行中子学分析。
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