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The Charpy impact test was originally developed as an acceptance test for steel products. However, using the Charpy test to evaluate the integrity of nuclear reactor vessels has caused the test data to be subject to scientific evaluation. The many small errors in parameters affecting the results produced relatively large errors in any analysis of the data. The sources affecting these errors are identified and an effort is made to quantify them. The Charpy impact test is a simple and convenient test but the end result is engineering data. To provide data for scientific evaluations greater control must be placed on all phases of the testing process.
Charpy impact test, Charpy data, neutron radiation, error analysis, controlling parameters, transition temperature shift, upper-shelf energy
Advisory Engineer (Materials), B&W Nuclear Service Company, Lynchburg, Virginia