In the industrial production, there exists the phenomenon of structure vibration caused by flow, which will cause the deformation and failure of the structure and lead to the economic loss, and even cause the industrial accident and great danger. In this paper, the one mechanism of fluid-induced vibration, namely fluid elastic instability, of the concentric circle arrangement tube bundles in the sodium-sodium heat exchanger is studied experimentally. According to different central angle positions, three kinds of tubular plates are designed, which are approximately triangle arrangement, approximately square arrangement and transitional arrangement respectively. In the small-size water tunnel non-contact graphic measurement is adopted to obtain the critical flow rate Ucr when the tube bundle is unstable. The experimental results show that the flow induced vibration resistance of the transitional arrangement is better, and the critical flow velocity is about 3.78.

In order to verify the effect of the combined restraint form of straight strip and corrugated strip on the heat transfer capacity of shell-tube heat exchanger with natural circulation. The physical model and mathematical model of the local heat exchange section of the heat exchanger are established by using ICEM and Fluent to carry out numerical simulation. The calculation results of three-dimensional flow field and temperature field of the heat exchange section are solved and analysed to obtain the resistance characteristics of the tube bundle of shell-and-tube heat exchanger under the restriction of corrugated strip and straight strip with natural circulation and the influence at the temperature field.

The main characteristics of the sodium pipe system in Demonstration Fast Reactor Power Plant (DFRPP) are high-temperature, thin-wall and big-caliber, which is different from high-pressure and thick-wall of the pressurized water reactor system, and the system is long-term operate in the environment of liquid metal sodium. How to guarantee the reliability of materials in high temperature are most important in material option. Engineering design depend on the criterion. Material standards are different in different countries, and corresponding construction codes are different too. Comparing the stainless steel pipe material standers at home and abroad and analyzing the material standards’ difference according to different construction codes, a stainless steel pipe material criterion system is put forward in this paper which is applicable for the DFRPP.

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