共查询到20条相似文献,搜索用时 563 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
Problem of the iodine method of purification of zirconium 总被引:1,自引:0,他引:1
A method is proposed for the determination of the equilibrium constantsk and k' for the reactions Zr+2I2–ZrI4=0 and 2I–I2=0, which is based on the measurement of the amount of iodine or zirconium liberated in the decomposition of zirconium tetraiodide on a heated surface in the process of establishing equilibrium. The decomposition of the tetraiodide was carried out at 900–1600C on a tungsten filament. The temperature distribution between filament and vessel walls was neglected.The dependence of the sum of atomic and molecular iodine pressures
on zirconium tetraiodide pressure
was determined at 1430C, and on temperature for
50 mm Hg. The values of kk'2 35 (mm Hg)3 at 1430C and k0.07 mm Hg at 400C, found from the results, differ substantially from known thermodynamic data, but give good agreement between the authors' formula [1] and experimental results on the iodide process of zirconium purification. 相似文献
9.
10.
11.
12.
13.
14.
Conclusions We note that the approach considered in this paper is applicable to the most dangerous accident situations and their combinations
for any type of reactor. In addition, reactors of a definite type have their own matrix of unit values of the criteria. For
different reactors such matrices can differ not only by accident situations (variants) but also some criteria (safety functionals
characterizing a definite accident process). Although for deterministic substantiation of self-shielding of one or another
design, it is necessary to examine all accident regimes of reactor operation, at the preliminary-search stage in the general
design process attention can be confined to the most significant (dangerous) situations. This will make it possible to decrease
substantially the dimension of the problem and increase the efficiency of the investigations.
Moscow Engineering-Physics Institute. Translated from Atomnaya énergiya, Vol. 82, No. 3, pp. 178–184, March, 1997. 相似文献
15.
16.
17.
Calculations of emergency situations occurring during the conversion of the VVR-SM reactor at the Institute of Nuclear Physics
of the Republic of Uzbekistan are presented. Results are presented for the following situations: motion of a compensating
rod (two cases), loss of electric power, and obstruction of a fuel assembly. It is shown that safety is maintained for all
the emergency situations which were analyzed and the behavior of all zones which were analyzed is actually identical. The
computational results will be used for the conversion of VVR-SM to low-enrichment fuel.
__________
Translated from Atomnaya énergiya, Vol. 104, No. 6, pp. 339–343, June, 2008. 相似文献
18.
19.
20.
从老化筛选模型人手,阐述了老化模型参数热阻的重要性。基于热阻测量原理,给出了常见的热阻测量方法.同时分析了各测量方法的优缺点。在此基础上提出了一种新颖的封装热阻估计实验方法。虽然不能精确地测量出国产VLSI的热阻值.但给出了一种国产VLSI封装热阻数据的获取方法。实验证明其具有较强的实用性,不失为一种国产VLSI热阻参数快速确定的工程技术。 相似文献