TY - GEN
T1 - Fuel assembly bowing
T2 - 2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018
AU - Zilly, Matías
AU - Pletz, Kevin
AU - Bostelmann, Friederike
AU - Aures, Alexander
AU - Velkov, Kiril
AU - Stoll, Uwe
N1 - Publisher Copyright:
© 2018 International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Fuel assembly bowing in Pressurized Water Reactors causes changes in inter-assembly gaps and therefore local changes of the fuel-to-moderator ratio. This study examines the impact of fuel assembly bowing on the local and global neutronics in terms of pin powers and 2D assembly powers, respectively. Transport calculations demonstrate that the changes in pin powers and homogenized cross-sections are independent of the fuel type, but dependent on the size of the inter-assembly gap. For example, the pin powers increase by up to 27-28% for an additional 15 mm gap. Both the Monte Carlo reference calculation as well as the GRS core simulator KMACS show that assembly powers increase by up to 3% around an additional 15 mm gap in the investigated model. While the total power remains constant, power redistributions are observed since assemblies that are not in close proximity to the bowing assembly compensate decreased fuel assembly powers occurring at locations where the inter-assembly gap closes.
AB - Fuel assembly bowing in Pressurized Water Reactors causes changes in inter-assembly gaps and therefore local changes of the fuel-to-moderator ratio. This study examines the impact of fuel assembly bowing on the local and global neutronics in terms of pin powers and 2D assembly powers, respectively. Transport calculations demonstrate that the changes in pin powers and homogenized cross-sections are independent of the fuel type, but dependent on the size of the inter-assembly gap. For example, the pin powers increase by up to 27-28% for an additional 15 mm gap. Both the Monte Carlo reference calculation as well as the GRS core simulator KMACS show that assembly powers increase by up to 3% around an additional 15 mm gap in the investigated model. While the total power remains constant, power redistributions are observed since assemblies that are not in close proximity to the bowing assembly compensate decreased fuel assembly powers occurring at locations where the inter-assembly gap closes.
KW - Fuel assembly bowing
KW - KMACS
UR - http://www.scopus.com/inward/record.url?scp=85106182165&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85106182165
T3 - International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems
SP - 1904
EP - 1915
BT - International Conference on Physics of Reactors, PHYSOR 2018
PB - Sociedad Nuclear Mexicana, A.C.
Y2 - 22 April 2018 through 26 April 2018
ER -