SYMPOSIA PAPER Published: 01 January 1998

Comparison of Compact, Reconstituted and Subsize Charpy Specimens


During the operation time of nuclear power plants change of material properties of the reactor pressure vessel may occur due to ageing or irradiation effects. A common tool to investigate this change of material properties is the determination of the shift in transition temperature by means of the Charpy impact test. Suitable index temperatures are derived from the test data of tested specimens of surveillance programs or from test data of specimens cut out of templets of RPVs. Due to lack of material, subsize and/or reconstituted specimens will be often used. In this paper investigations on reconstituted specimens are discussed and compared to results of compact (original) and subsize impact specimens. From the experimental data base the conclusion can be drawn that valid index temperatures for safety analysis can be derived from the test data of reconstituted specimens with minimum insert lengths of 10mm. Also from the test data of subsize specimens valid index temperatures can be obtained, if corresponding correlation functions to the original conventional ISO Charpy test data are applied.

Author Information

Keim, E
Siemens AG KWU/NT13, Erlangen, Federal Republic of Germany
Langer, R
Siemens AG KWU/NT13, Erlangen, Federal Republic of Germany
Hofmann, G
Siemens AG KWU/NT13, Erlangen, Federal Republic of Germany
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Developed by Committee: E10
Pages: 411–419
DOI: 10.1520/STP38002S
ISBN-EB: 978-0-8031-5565-7
ISBN-13: 978-0-8031-2476-9