Background: Hold down spring is a structural component that supports the reactor pressure vessel.It is located between the flange and barrel components

and has a function that transfers the force caused by reactor pressure vessel cap to barrel flange.Purpose: This paper attempts to have an analysis calculation and comparison of AP1000 and LPP Hold down spring.Methods: This article inherited Qinshan nuclear power hold down spring analysis method

use analytical method and FEM method to solve the problem.Results: The stress and deflection of HDS are calculated.Since the friction coefficient may have a large effect

the results of different friction coefficients are also analyzed.Conclusions: This paper compared the Qinshan

AP1000 and LPP HDS design advantages and disadvantages and proposed two kinds of new design

expected to have a reference value for follow-up engineers.