Seismic Proving Test of Ultimate Piping Strength: Current Status of Preliminary Tests — II

Abstract

In 1998FY, the 6 year program of piping tests was initiated with the following objectives: i) to clarify the elasto-plastic response and ultimate strength of nuclear piping, ii) to ascertain the seismic safety margin of the current seismic design code for piping, and iii) to assess new allowable stress rules. In order to resolve extensive technical issues before proceeding on to the seismic proving test of a large-scale piping system, a series of preliminary tests of materials, piping components and simplified piping systems is intended. In this paper, the current status of the piping component tests and the simplified piping system tests is reported with focus on fatigue damage evaluation under large seismic loading.

Simulation of Cyclic Loading on Pipe Elbows Using Advanced Plane-Stress Elastoplasticity Models1

“…Using a shaking table, 32 piping components have been tested to quantify the impact of fabrication details on the structural performance under seismic loading. Suzuki et al [12] reported the experimental results of a 6-year project aiming at evaluating fatigue damage under severe seismic loading, and more recently Chen et al [13] tested steel pipe elbows under constant internal pressure and cyclic in-plane bending. Pipe wall thinning effects have been investigated by Shi et.…”

Investigation on ultimate strength of thin wall tee pipe for sodium cooled fast reactor under seismic loading

“…A series of failure tests of thick wall piping have been conducted in Light Water Reactors (LWRs) studies. These results indicate that the failure mode of a thick wall piping under seismic loading is low cycle fatigue accompanied by ratchet deformation (Suzuki et al, 2002aand 2002b, Suzuki et al, 2004. Based on these results, the Japanese seismic design code for LWRs JEAC4601-2008 was revised so that the main evaluation of piping under seismic loading is fatigue evaluation (Japan Electric Association Code, 2008).…”