共查询到19条相似文献,搜索用时 156 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
采用非剧毒三甲基氯硅烷/碘化钠作为去烷基化试剂与磷酰基乙酸三甲酯反应,代替剧毒品硫酸二甲酯制备用于碘吸附器检验的气态放射性甲基碘。分别在实验室碘吸附器整机检验装置和核电站通风净化系统中,采用替代方法与"硫酸二甲酯法"进行了碘吸附器净化系数测定的对比试验,同时试验观察了替代试剂对甲基碘发生器有机材料部件的影响。试验结果表明,采用替代方法与"硫酸二甲酯法"测得的碘吸附器净化系数基本一致,所用替代试剂与试验装置相容性较好,初步判定可用于碘吸附器整机检验和核电站碘吸附器现场试验,具有广阔的应用前景。 相似文献
11.
12.
对环己烷气体在碘吸附器用浸渍活性炭上的动态解吸行为进行了实验研究。考察了不同的载气温度、相对湿度、流速、炭床厚度以及进气中环己烷浓度对环己烷在活性炭床上解吸行为的影响,为环己烷试验方法在碘吸附器现场泄漏率试验的研究及推广提供了一定的理论支撑。试验结果表明:(1)在40 ℃,30%相对湿度条件下环己烷在活性炭床上可滞留约500 min,增大气流温度、湿度、浓度和载气流速可以减少滞留时间,其中温度对滞留时间的影响最为显著。(2)在气流相对湿度为80%时,浓度为100 ppm(10-6)的环己烷在活性炭床上的滞留时间仍达到90 min,这有利于高湿度条件下进行碘吸附器泄漏率试验。 相似文献
13.
L. I. Fedorova P. Ya. Poltinin L. V. Karnatsevich M. A. Zhazhmuradov S. O. Lystsov V. V. Teslenko Yu. L. Kovrizhkin 《Atomic Energy》1999,87(4):737-741
A possible mechanism leading to a substantial increase in the aerodynamic resistance of AU-1500 iodine carbon adsorbers used
in the ventilation systems of nuclear power plants is examined. It is shown that the relatively small wear (several percent)
of SKT-3 adsorbent granules with formation of a dust fraction can result in a substantial (ten-fold) increase of the aerodynamic
resistance of adsorbers. Possible reasons for the wear of an absorbent and dust getting into an adsorber are given, 4 figures,
6 references.
Translated from Atomnaya énergiya, Vol. 87, No. 4, pp. 279–283, October, 1999. 相似文献
14.
15.
16.
17.
《Journal of Nuclear Science and Technology》2013,50(11):717-721
In sodium pool burning occurring in the case of an LMFBR accident, some radio-iodine in the sodium coolant may be transported into the gas phase and act in common with sodium oxide aerosol. If some iodine is converted to volatile compounds, the radioactivity may remain for many hours in the gas phase of the reactor containment. The present work was carried out in an attempt to throw more light on these circumstances. Reactor-grade sodium with sodium iodide tagged with 131I in an amount of about 1 ppm was burned by heating in a closed vessel containing air. Most of the iodine released into the gas phase took the form of aerosol, but some amount remained in vaporous state. It was determined by Maypacks and radio-gaschromatography that the volatile radio-iodine compounds were of organic form. The proportion of organic iodide referred to total airborne iodine in the present experiments falls within the experimental data on what will be formed in a loss of coolant accident involving a light water reactor. It is concluded that volatile iodine formation would present similar aspects under accidental conditions affecting both LWR and FBR, though the mechanisms governing the two cases would be different. 相似文献
18.
Bin Long Jun-Li Li Qun-Shu Wang Shu-Juan Feng Guo-Qing Zhou Tian-Cheng Feng Yan-Jie Tian Huai-Cheng Ma 《核技术(英文版)》2017,28(8)
In designing a fixed-bed adsorber,it is vital to understand dynamic adsorption properties of the unit.Temperature is an important effect on adsorbent performance,as the dynamic adsorption coefficients tend to increase with decreasing temperature.To minimize the volume of the fixed-bed adsorber,the dynamic adsorption characteristics of Xe were studied at 77 K by employing a variety of adsorbents under different operational conditions.The carbon molecular sieve performed better than that of activated carbon.Both operational conditions and the presence of gaseous impurities were found to affect the adsorption properties. 相似文献