Change search
ReferencesLink to record
Permanent link

Direct link
Detailed B-10 depletion in control rods operatingin a Nuclear Boiling Water Reactor
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
2011 (English)Independent thesis Advanced level (professional degree), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

In a nuclear power plant, control rods play a central role to control the reactivity ofthe core. In an inspection campaign of three control rods (CR 99) operated in theKKL reactor in Leibstadt, Switzerland, during 6 respectively 7 consecutive cycles,defects were detected in the top part of the control rods due to swelling caused bydepletion of the neutron-absorbing 10B isotope (Boron-10). In order to correlatethese defects to control rod depletion, the 10B depletion has in this study beencalculated in detail for the absorber pins in the top node of the control rods.Today the core simulator PLOCA7 is used for predicting the behavior of the reactorcore, where the retrievable information from the standard control rod follow-up isthe average 10B depletion for clusters of 19 absorber holes i.e. one axial node.However, the local 10B depletion in an absorber pin may be significantly differentfrom the node average depletion that is re-ceived from POLCA7. To learn more, the 10B depletion has been simulated for each absorber hole in the uppermost node usingthe stochastic Monte Carlo 3D simulation code MCNP as well as an MCNP- based2D-depletion code (McScram). It was found that the 10B depletion is significantly higher for the uppermost absorberpins than the node average. Furthermore, the radial depletion in individual absorberpins was found to be much higher than expected. The results are consistent with theexperimental data on control rod defects.

Place, publisher, year, edition, pages
2011. , 33 p.
UPTEC K, ISSN 1650-8297 ; 11015
Keyword [en]
Boron depletion, control rod, Boiling Water Reactor, BWR
National Category
Subatomic Physics
URN: urn:nbn:se:uu:diva-155416OAI: diva2:426054
Subject / course
Educational program
Master Programme in Chemical Engineering
Available from: 2011-06-29 Created: 2011-06-22 Last updated: 2011-06-29Bibliographically approved

Open Access in DiVA

fulltext(1088 kB)1212 downloads
File information
File name FULLTEXT01.pdfFile size 1088 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Johnsson, John
By organisation
Department of Materials Chemistry
Subatomic Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 1212 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 392 hits
ReferencesLink to record
Permanent link

Direct link