Analysis of the chemical composition of reactor pressure vessels by means of atomic emission spectrometry

Safety analyses require proof of the intogrity of LWR pressure vessels. This necessitates brittle fracture strength analyses. The material composition on the inner wall of reactor pressure vessels is determined by a mobile atomic emission spectrometer making use of sparte excitation; it enables quantitative measurements of elements sensitive to neutron embrittlement. For example, the Cu concentration in high-activity pressure vessel material can be determined with an accuracy of <3% (3 σ). Spark excitation does not indicate any effects on the pressure vessel material in terms of abrasive wear of thermal load. (orig.)