The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps

Abstract

Coast-down characteristics are the crucial safety evaluation factors of nuclear reactor coolant pumps. The energy stored at the highest moment of inertia of the reactor coolant pump unit is utilized to maintain a normal coolant supply to the core of the cooling loop system for a short period of time during the coast-down transition. As a result of the high inertia moment of the rotor system, the unit requires a high reliability of the nuclear reactor coolant pump and consumes considerable energy in the start-up and normal operation. This paper considers the operational characteristics of the coast-down transition process based on the existing hydraulic model of the nuclear reactor coolant pump. With the implementation of an orthogonal test, the hydraulic performance of the nuclear reactor coolant pump was optimized, and the optimal combination of impeller geometrical parameters was selected using multivariate linear regression to prolong the coast-down time of the reactor coolant pump and to avoid serious nuclear accidents.

Study on the influence of guide vane angle on performance characteristics of reactor coolant pump during idling

“…It was found that the ow state of the uid medium can be signi cantly improved, the ow loss can be reduced, the idling time can be increased, and the pressure pulsation amplitude within each sub frequency range can be reduced. In order to prolong the idling time of the RCP, Zhao [11] optimized the hydraulic performance of the RCP through orthogonal test, and obtained the optimal geometric parameter combination of the impeller by multiple linear regression. Xie [12] put forward a mathematical model of speed and ow during idling of RCP, predicted the mathematical relationship of hydraulic performance of guide vanes under different parameters, and veri ed it with idling test data.…”