Stresses on Expansion Joints Used in Penetrations

Abstract

During the 8th outage of the Angra 2 power plant, the expansion joints of the containment penetration JMK05D0201 (LCQ50) were found distorted. The cause was an inadvertent over pressurization made during monthly tests to verify the set pressure. To leave the damaged expansion joint installed, Eletronuclear conducted an elastic-plastic analysis which has demonstrated its integrity. Eletronuclear decided to keep it in place and cover it with an expansion joint designed to resist all loads predicted in the original design specification. This new design is a two-sided (bipartite) bellows with longitudinal field welds. This chapter presents the fatigue and stress analysis of the bipartite overlapping expansion joints considering the loads defined in the design specification.

Stresses on Expansion Joints Used in Penetrations

“…The highlighted rows represent the envelope loading conditions for each load case. It is important to note that the load case P1 (First Containment Integrity and Leakage test) will not be considered in thisSuanno, Rodolfo, Maneschy, José E. (2022) Stresses Expansion Joints in Penetrations pp. 231-259…”