SEDL / STP / STP1329-EB / STP37990S

Small Specimen Testing Applied at Surveillance Extension

Czoboly, E
Senior Researcher, Atomic Energy Research Institute,

Gillemot, F
Senior Researcher, Atomic Energy Research Institute,

Oszwald, F
Head of Testing Lab. Nuclear Power Plant Paks, Paks,

Pages: 10    Published: Jan 1998

Download this paper for $25 PDF (208K)          View License Agreement
Abstract

The WWER-440 V-213 type RPVs are equipped with the surveillance specimens used to predict the embrittlement of the RPV material. These specimens are located near the core, resulting in accelerated irradiation. After four years of operation only one overexposed set remains in each unit. To obtain a more extensive database for life time calculation and life time management, a new, more extended surveillance program has been elaborated and implemented. Due to the limited availability of archive materials reconstructed Charpy V specimens and small size smooth and notched tensile bars were used in the program. To develop this surveillance extension, an extensive laboratory study on use of reconstructed Charpy and subsize tensile specimens was performed. Methods for K^1a measurements on small size specimens were also studied.