跳源法测量ADS启明星Ⅱ号的次临界度及动态特性

本文主要利用²⁵²Cf外中子源驱动的ADS启明星Ⅱ号次临界装置来验证理论计算的次临界度及不同次临界度下的断束动态特性。简要介绍了利用跳源法在ADS启明星Ⅱ号上测量次临界度的原理、实验装置、测量系统、堆芯布置及实验结果等。实验通过变化堆芯燃料棒的装载来模拟3个次临界状态，即k_eff分别为0.99、0.98和0.97。实验结果与理论计算结果符合较好，验证了理论计算的正确性。经过实验验证的理论计算程序和核数据，为将来的中国科学院战略性先导科技专项--未来先进核裂变能ADS嬗变系统的次临界反应堆设计提供参考价值。

Sub-critical Reactivity and Dynamic Characteristic Measured by Source-jerk Method on VENUS-Ⅱ

The paper is about validating the theoretical calculations of sub-critical reactivity and dynamic characteristic measurements in different sub-critical levels by using external neutron source ²⁵²Cf on VENUS-Ⅱ. By using the source-jerk method on VENUS-Ⅱ, the measurement theory of sub-critical reactivity, experimental assembly, measurement system, reactor core, experiment results and so on were introduced. Three sub-critical levels (k_eff is 0.99, 0.98 and 0.97) were chosen to carry out the measurements by different loadings of nuclear fuel rods. The theoretical calculation result fits well with the experimental measurement result, which proves the correctness of calculation result. The theoretical calculation code and nuclear data validated by experiment can provide a reference value to the sub-critical reactor design of the advanced nuclear fission ADS in the future.