Abstract
In order to study the transient characteristics of a nuclear reactor coolant pump in coast-down process under power failure condition, a transient test device for the nuclear reactor coolant pump is set up. This paper investigates the effects of the rotor of the nuclear reactor coolant pump and the circuit characteristics on the nuclear reactor coolant pump during the coast-down process by changing the rotary inertia of the flywheel and the resistance of the pipe system. The results show that the greater the moment of inertia is, the more slowly rotational speed, flow and lift get down in the same coast-down period. The change of the pipe resistance has little effect on the rate of decline in the coast-down process, but it has a great influence on descent speed of the flow rate and lift. When the pipe resistance is small, the corresponding flow rate decreases faster, but it is slower for the corresponding lift. The results are of great significance in controlling the stability and reliability of the nuclear reactor coolant pump in the coast-down process.
Highlights
With the continuing increase in economy in today’s society, the demand for energy keeps growing, corresponding to the shortage of fossil fuel supplies and restrictions on greenhouse gas emissions
In order to explore the influence of rotational inertia and pipe resistance on the nuclear reactor coolant pump during the coastdown period, the following two aspects are mainly discussed: 1)
It can be seen from the figure that the relationship between each characteristic and time in the coast-down process is nonlinear for the flywheel with the same rotational inertia, and different valve openings correspond to different characteristic curves
Summary
With the continuing increase in economy in today’s society, the demand for energy keeps growing, corresponding to the shortage of fossil fuel supplies and restrictions on greenhouse gas emissions. Xu and Xu (2011) proposed and verified a new calculation model of coast-down rotational speed and concluded the change rule of coast-down time when the nuclear reactor coolant pump reached half flow in different moments of inertia. In order to explore the influence of rotational inertia and pipe resistance on the nuclear reactor coolant pump during the coastdown period, the following two aspects are mainly discussed: 1). The hydraulic model of the nuclear reactor coolant pump has enough precision to test the nonlinear coast-down transient process under normal temperature and pressure. Increasing the moment of inertia of the nuclear reactor coolant pump by adding a flywheel can prolong the coast-down time of the pump and avoid accidents. The transient measurement device for the nuclear reactor coolant pump during the coast-down period is shown, and it is a closed loop test system. After collecting a set of data, replace the flywheel and collect the characteristic data of the pump optimized according to the above steps
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
