According to characteristics of the secondary loop system of nuclear power units

a universal heat economic calculation framework for pressurized-water reactor(PWR)nuclear power plant heat regenerative system was established

based on theoretical deduction.On this basis

by selecting the cycle thermal efficiency as the optimization goal and the extraction steam pressures as the optimization variables

a universal nuclear power unit regenerative system optimization model was established.Taking a 900 MW nuclear power unit as the example

adaptive weighed particle swarm optimization(AWPSO)was applied to solve the feed-water heating allocation problem in nuclear power units for the first time.The calculation result demonstrates that

the PSO has great convergence ability and search performance

and is superior to other methods and the original design scheme.This paper provides a new and convenient design for PWR nuclear power plant heat regenerative systems.