The inertia tank (IT) used in the deep pool-type nuclear reactor (DPR) is a novel design to reduce the decrease rate of core flow in the early stage of loss of flow accident. Under the action of IT, the reactor can be safely reduced to low power conditions. In this paper, based on cold state condition, the hydraulic process of IT is studied by experiment. Furthermore, RELAP5 is used to simulate hydraulic process of IT and the results show that RELAP5 can well simulate the variation of water level and mass flow during the working process of IT. The maximum relative error of water level and mass flow are 0.5% and 5.6%, respectively. Based on the RELAP5 model, the influences of flow resistance on the hydraulic process of IT are studied. The research results show that the hydraulic process of IT is significantly affected by the flow resistance in both upstream part of IT (UIT) and connection pipe (CP), while the flow resistance in downstream part of IT (DIT) has little effect on the hydraulic process of IT. In addition, the differences between IT and primary pump with flywheel are compared by the means of RELAP5. The research in this work can provide reference for the design of IT.

深池型核反应堆（DPR）中使用的惯性储能箱（IT）是一种新颖的设计，可以减少失水事故初期的堆芯流量下降率。在IT的作用下，可以将反应堆安全地降低到低功率状态。本文基于冷态条件，通过实验研究了IT的水力过程。此外，RELAP5被用来模拟IT的水力过程，结果表明RELAP5可以很好地模拟IT工作过程中水位和质量流量的变化。水位和质量流量的最大相对误差分别为0.5％和5.6％。基于RELAP5模型，研究了流动阻力对IT液压过程的影响。研究结果表明，IT的水力过程受IT上游部分（UIT）和连接管（CP）的流动阻力的显着影响，而IT下游部分（DIT）的流动阻力对IT的影响很小。 IT的液压过程。此外，还通过RELAP5比较了IT和带飞轮的主泵之间的差异。这项工作的研究可以为IT设计提供参考。