Behaviour of Inner Containment Structure of an Indian PHWR during ProofTesting

摘要

The present Indian pressurised heavy water reactors (PHWR) being designed and constructed have a doublecontainment system where the inner containment (IC) is a prestressed concrete cylinder with a prestressed concrete sphericalsegmental dome. The outer containment (OC) encompasses the IC and is made of reinforced concrete. To ensure thestructural integrity of the IC under design basis accident (DBA) pressure and elastic behaviour of the IC, the containment ispressurised to its design pressure and deflections and strains of IC are measured. A scheme of instrumentation for IC to thiseffect is fmalised at the design stage. This paper presents a comprehensive study of the performance of the instrumentation inmeasuring the deflections and strains with respect to the analytical values obtained from the f'mite element (FE) analysis. Thispaper also discusses briefly about the design of IC. Based on the detailed comparison it is concluded that the behaviour of theIC structure and the developed stresses are matching well with the theoretical predictions and the stresses developed in the ICstructure are well within the specified limit of the selected design code.