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Simulated Performance of the Micro-Pocket Fission Detector in the Advanced Test Reactor Critical Facility
Nuclear Science and Engineering ( IF 1.2 ) Pub Date : 2021-04-12 , DOI: 10.1080/00295639.2021.1898922
Daniel M. Nichols 1 , Michael A. Reichenberger 2 , Andrew D. Maile 2 , Mary R. Holtz 2 , Douglas S. McGregor 1
Affiliation  

Abstract

The Micro-Pocket Fission Detector (MPFD) is a small-form-factor real-time fission chamber. MPFD performance has been simulated in the Advanced Test Reactor Critical Facility located at Idaho National Laboratory. The neutron and gamma-ray flux profiles and magnitudes were simulated using MCNP in the near-core B-8 irradiation position. These simulations were performed at 69 discrete axial locations inside the B-8 position 55 for three separate orientations of the nearby hafnium outer shim control cylinders and at a power level of 700 W(thermal). The resulting neutron and gamma-ray flux values were used to determine the MPFD response for various fissile masses and detector gas pressures. The optimal gas-operating pressure was determined to be between 30 and 60 psig. The required fissile layer mass was determined to be between 0.5 to 1.0 µg of 235U. Additionally, the gamma ray to fission fragment interaction rate was determined to be 1.43 × 103 with average energy deposition for gamma rays and fission fragments in 30 psig argon gas to be 1 keV and 3.5 MeV, respectively.



中文翻译:

先进测试反应堆关键设施中微型裂变探测器的模拟性能

摘要

微型袖珍裂变探测器 (MPFD) 是一种小型实时裂变室。MPFD 性能已在位于爱达荷州国家实验室的先进测试反应堆关键设施中进行了模拟。中子和伽马射线通量分布和强度是在近堆芯 B-8 辐照位置使用 MCNP 模拟的。这些模拟是在 B-8 位置 55 内的 69 个离散轴向位置进行的,用于附近铪外垫片控制圆柱的三个不同方向,功率水平为 700 W(热)。由此产生的中子和伽马射线通量值用于确定各种裂变质量和探测器气体压力的 MPFD 响应。最佳气体操作压力被确定为介于 30 和 60 psig 之间。所需的裂变层质量确定为 0.5 至 1.0 µg235 U。此外,伽马射线与裂变碎片的相互作用速率确定为 1.43 × 10 3,伽马射线和裂变碎片在 30 psig 氩气中的平均能量沉积分别为 1 keV 和 3.5 MeV。

更新日期:2021-04-12
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