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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >B-10(n, alpha)Li-7 reaction-induced gas bubble formation in Al-B4C neutron absorber irradiated in spent nuclear fuel pool
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B-10(n, alpha)Li-7 reaction-induced gas bubble formation in Al-B4C neutron absorber irradiated in spent nuclear fuel pool

机译：B-10（N，α）Li-7在核燃料库中辐照的Al-B4C中子吸收器中的反应诱导的气泡形成

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Al-B4C metal matrix composites have been utilized as a neutron absorber for the past two decades to manage the neutron flux and the criticality of spent nuclear fuel pools. Recently, premature surface corrosion has been found from an eight-year-old surveillance coupon although 40 years of service life was guaranteed based on separated corrosion tests and gamma irradiation tests. Suspecting the premature corrosion was assisted by radiation damage effects from energetic particles emitted from B-10(n, alpha)Li-7 reaction, nanoscale characterization and neutron attenuation tests were carried out on the surveillance coupons used in a spent nuclear fuel pool for 33, 52, and 99 months to investigate the degradation mechanisms and B-10 depletion. Highly radiation-damaged structures, such as numerous gas bubbles filled with helium and hydrogen in the aluminum matrix and microcracks in boron carbide particles, were observed from all absorber coupons with slightly reduced densities (<1%) matching with the porous structures. The neutron attenuation tests on 52 and 99 month-installed coupons showed similar to 3.1% reduction of B-10 areal density, which also indicates the needs for further investigation on the longterm safety and performance of the absorber material. (c) 2020 Elsevier B.V. All rights reserved.
机译：在过去二十年中，Al-B4C金属基质复合材料已被用作中子吸收器来管理中子磁通量和废核燃料池的临界性。最近，八十岁的监视优惠券中发现了过早的表面腐蚀，尽管基于分离的腐蚀试验和伽马照射试验保证了40年的使用寿命。怀疑来自B-10（N，α）Li-7反应发出的高能粒子的辐射损伤效应辅助过早腐蚀，在花费核燃料池中使用的监视优惠券中进行纳米级表征和中子衰减试验33 52和99个月来研究降解机制和B-10耗尽。从所有吸收试样都观察到高度辐射损坏的结构，例如填充有硼和氢堆的含有氦气和氢气的氢气和微裂纹，从所有吸收剂杯中观察到与多孔结构均匀的密度（<1％）匹配。 52和99个月安装的优惠券的中子衰减试验表明，B-10强度的减少3.1％，这也表明了进一步调查了吸收材料的长期安全性和性能的需求。 （c）2020 Elsevier B.v.保留所有权利。

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