Studies on the effects of local power peaking on heat transfer under dryout conditions in BWRs

Clifford, Ivor; Pecchia, M.; Mukin, Roman; Cozzo, C.; Ferroukhi, H.; Gorzel, A.

doi:10.1016/j.anucene.2019.03.017

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…The implicit contact methodology has been implemented as a custom boundary condition in OFFBEAT, [41][42][43][44][45] a stress solver developed for nuclear engineering applications and based on the OpenFOAM C++ library. 31,46 In this section, we verify the methodology against five test cases with known solution.…”

Section: Benchmark Casesmentioning

confidence: 99%

Development of a semi‐implicit contact methodology for finite volume stress solvers

Scolaro

Clifford

Pautz

2021

Numerical Meth Engineering

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The past decades have seen numerous efforts to apply the finite volume methodology to solid mechanics problems. However, only limited work has been done by the finite volume community toward the simulation of mechanical contact. In this article, we present a novel semi-implicit methodology for the solution of static force-loading contact problems with cell-centered finite volume codes. Starting from the similarities with multi-material problems, we derive an implicit discretization scheme for the normal contact stress with a straightforward inclusion of frictional forces and correction vectors for non-orthogonal boundaries. With the introduction of a sigmoid blending function interpolating between contact stresses and gap pressure, the proposed approach is extended to cases with partially closed gap. The contact procedure is designed around an arbitrary mesh mapping algorithm to allow for non-conformal meshes at the contact interface between the two bodies. Finally, we verify the contact methodology against five benchmarks cases.

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Section: Benchmark Casesmentioning

confidence: 99%

Development of a semi‐implicit contact methodology for finite volume stress solvers

Scolaro

Clifford

Pautz

2021

Numerical Meth Engineering

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“…At the end of cycle of a Swiss BWR, a fuel rod leaker was detected through an increase in the off-gas activity of the plant. A subsequent analysis identified dryout as root cause for the fuel failure, even though a rather high safety margin concerning dryout was predicted by the thermal-hydraulic core design relying on commonly used models and methods (Clifford et al, 2019). Further hot cell examinations identified the local marks on the fuel rod as CRUD.…”

Section: Introductionmentioning

confidence: 99%

“…However such simulations required either specific feature of the code (domain decomposition in Serpent) available only for depletion problems or codes which are not openly available (Lee et al, 2020). Modeling the full set of cycles to the point of interest, like in (Clifford et al, 2019) is not feasible due the computational cost of coupled Monte Carlo depletion calculation. It should be noted at this point that a large amount of efforts is on-going in various institutions worldwide to perform reactor wide high-fidelity calculations.…”

Section: Introductionmentioning

confidence: 99%