SYMPOSIA PAPER Published: 01 January 1989
STP10073S

Neutron Exposure of Gundremmingen-A Pressure Vessel Trepans

Source

After decommissioning of the nuclear power plant Gundremmingen-A (KRB-A) several trepans have been taken from the pressure vessel for a validation program of sur-veillance test practice. To define neutron exposure after more than ten years' operation a complete analysis of the reactor power time history and of the three-dimensional burnup distributions at the beginning and end of each reactor cycle had to be performed. Neutron exposure parameters such as fast fluence (E > 1.0 and E > 0.1 MeV) and dpa have been calculated using the DOT 4.2 code. The attenuation of neutron exposure within the KRB-A vessel wall is discussed in context with the formulae proposed in Regulaton Guide 1.99, Revisions 1 and 2. To confirm the results of the transport calculations, calculated and measured Mn-54 activities of the trepans have been compared. Additionally dosimetry results from surveillance capsules have been analyzed.

Author Information

Prillinger, G
Institut für Kernenergetik und Energiesysteme, Universität Stuttgart, Stuttgart 80, West Germany
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Details
Developed by Committee: E10
Pages: 165–174
DOI: 10.1520/STP10073S
ISBN-EB: 978-0-8031-5069-0
ISBN-13: 978-0-8031-1184-4