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Changes in the relative pin power distribution in a nuclear fuel assembly due to channel bow and pin dislocations
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Radiation Sciences.ORCID iD: 0000-0003-3411-7058
2003 (English)Report (Other academic)
Abstract [en]

Simulations of the relative pin power distribution in a nuclear fuel assembly have been performed using the core-analysis code CASMO-4. A cross section of a previously unirradiated BWR assembly of the GE12S fuel type was simulated in a burnup range of 0–16 MWd/kgU. The simulated void content was kept constant at 25%. Two main types of geometric disturbances from the nominal assembly geometry were investigated: (1) channel bow and (2) dislocations of individual fuel pins. The disturbances were simulated to be constant throughout the whole burnup range.

It was concluded that the first type of disturbance could give rise to the largest changes in relative pin power, as compared to the non-disturbed case. The maximum increase was about 4% per simulated mm channel bow up to a simulated bow of 9 mm. Due to the reflective boundary conditions used in CASMO‑4, this corresponds to a 2% change in pin power per mm change in water gap between adjacent assemblies. For dislocations of individual fuel pins, the largest increase in relative pin power was 2.6% per mm, obtained for a peripheral pin. The largest changes were generally obtained at beginning of cycle (BOC).

As expected due to effects from enhanced neutron moderation, it was found that relative pin powers generally increased in regions where water gaps were widened and vice versa. There was also an influence from BA-pins, i.e. pins with a content of burnable neutron absorbers. When a pin was dislocated towards a BA-pin, its relative power decreased. The decrease in BA content with irradiation also gave rise to non-linear dependencies between burnup and changes in BA pin power, as compared to the non-disturbed case.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2003. , p. 39
Keywords [en]
Nuclear fuel, pin power, geometry, simulation
National Category
Subatomic Physics
Research subject
Nuclear Physics
Identifiers
URN: urn:nbn:se:uu:diva-354138OAI: oai:DiVA.org:uu-354138DiVA, id: diva2:1220795
Available from: 2018-06-19 Created: 2018-06-19 Last updated: 2018-06-20Bibliographically approved

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CiteExportLink to record
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