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首页> 外文期刊>World Journal of Nuclear Science and Technology >An Investigation of the Impact of Installation of Cd-Lined Irradiation Channel in NIRR-1 on Core Physics Data for ENAA
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An Investigation of the Impact of Installation of Cd-Lined Irradiation Channel in NIRR-1 on Core Physics Data for ENAA

机译：NIRR-1中安装Cd线照射通道对ENAA核心物理数据影响的调查

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摘要

Prior to the installation of the Cd-liner in one of the large outer irradiation channels of NIRR-1, a Monte Carlo simulation was performed using MCNP5 version 1.4 code. This was done to investigate the effect of installation of Cd-liner in either an inner or outer irradiation channel on reactor physics parameters. Data obtained indicate that the core excess reactivity in both inner and outer irradiations channels is reduced by 3.60 ± 0.07 mk and 0.64 ± 0.06 mk, respectively. Considering the fact that NIRR-1 has a cold core excess reactivity of 3.77 mk, results obtained show that installation of the 1 mm thick Cd-sheet in one of the large outer irradiation channels would have no significant impact on the core physics data. After installation of a 1 mm Cd sheath in a large outer irradiation channel, the neutron flux distribution and the stability in the irradiation channels were monitored by foil activation method. Results indicate that the uniformity of neutron flux distribution in the irradiation channel is preserved and the neutron flux data were found to be comparable with the data obtained before the installation.
机译：在NIRR-1的较大外部辐照通道之一中安装Cd衬管之前，使用MCNP5 1.4版代码进行了蒙特卡洛模拟。这样做是为了研究在内部或外部辐照通道中安装Cd衬管对反应堆物理参数的影响。获得的数据表明，内部和外部照射通道中的核心过量反应性分别降低了3.60±0.07 mk和0.64±0.06 mk。考虑到NIRR-1具有3.77 mk的冷核过剩反应性这一事实，所获得的结果表明，在较大的外部辐照通道之一中安装1 mm厚的Cd片层不会对堆芯物理数据产生重大影响。在大的外部辐照通道中安装1 mm Cd护套后，通过箔活化方法监测中子通量分布和辐照通道中的稳定性。结果表明，辐照通道中的中子通量分布保持均匀，并且发现中子通量数据与安装前获得的数据相当。

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