Journal of Applied Mathematics and Physics, 2013, 1, 57-61

Published Online November 2013 (http://www.scirp.org/journal/jamp)

http://dx.doi.org/10.4236/jamp.2013.16012

Open Access JAMP

Application of Peps in Stress Analysis of Nuclear Piping

Rui Liu, Zhiwei Fu, Tieping Li

Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing, China

Email: l i urui_1985@yeah.net, everlasting_cat@sina.com

Received August 2013

ABSTRACT

According to the nuclear safety regulations, this paper discusses the mechanical analysis method for piping system.

Peps program has advantages of stress analysis and evaluation for nuclear piping. First, this paper introduces the Peps

software, and discusses the process of stress analysis and evaluation for nuclear piping using the general finite element

software; Secondly, taking nuclear class 2/3 piping system as an example, it uses Peps4.0 program to calculate the pip-

ing stress in variety of working conditions, such as weight, pressure, thermal expansion, earthquake, time-histo ry force,

and etc. Finally, the paper calculates the maximum stress and stress ratio according to the ASME.

Keywords: Peps; Nuclear Class 2/3; Piping; ASME

1. Introduction

In recent years, the rapid development of nuclear power

plants has more strict demand for safety. The safety of

nuclear power plants depends mainly on the devices

which perform safety functions. Most of these devices

are treated with radioactive medium. Once leakage oc-

curs, it will result in the loss that can’t be estimated.

Therefore the nuclear power plants must be designed in

accordance with the corresponding regulatory require-

ments. Nuclear piping which provides the important

guarantee for safe operation is important equipment in

nuclear reactor. The purpose of stress analysis for nuclear

piping is to proof that the maximum stress does not ex-

ceed the limits of regulatory requirements under different

working conditions [1].

There are two kinds of methods of stress analysis for

nuclear piping: simplified calculation method and nu-

merical simulation method. Simplified calculation me-

thod based on the empirical formula, which is suitable

for small piping, could not accurately describe the me-

chanical behavior of the piping system. Considering the

high requirements for security, large piping systems with

complex mechanical properties must resort to numerical

simulation method with the aid of computer program [2].

With the development and application of computer

technology, stress analysis of larger piping system can be

achieved. At present, the civilian nuclear piping stress

analysis software are mainly: ADLPIPE, AUTOPIPE,

SYSPIPE, PIPESTRESS, KWUROHR, HROHR2, APA

(AREVA PIPING ADDON), and etc. Peps (PIPE-

STRESS) used in the three-dimensional linear elastic

piping systems analysis and calculation at home and

abroad. This paper takes a nuclear class 2/3 piping sys-

tem model as an example, and uses Peps4.0 program to

calculate the piping stress in variety of working condi-

tions, such as weight, pressure, thermal expansion, earth-

quakes time-history force, and etc. Finally the paper uses

ASME standard to evaluate the mechanical properties

[3-5].

2. Peps Overview

Peps of DST Company in Switzerland is an integrated

package containing PIPESTRESS, the piping analysis

core program, and Editpipe, its pre- and post-processor.

PIPESTRESS is a program for performing linear elastic

analysis of three -dimensional piping systems subject to a

variety of loading conditions. Chemical process piping,

nuclear and conventional power generation piping sys-

tems may be investigated for compliance with piping

codes and with other constraints on system response.

PIPESTRESS plays an important role in the world nuc-

lear industry. Editpipe is the pre- and post-processor of

PIPESTRESS. Here are some outstanding features of

Editpipe: 1) Advanced text editor environment with full

syntax coloring for editing PIPESTRESS free format

input files. 2) Instant visualization of the piping model

defined in the input file, with input error detection. 3)

Integrated database of PIPESTRESS free format input

cards and standard piping fittings. 4) Post-processing

module for visualizing mode shapes and load case dis-

placements, forces and moments. 5) Tabular view of the

data. 6) QuickPipe wizard to generate complete input