Radial-hydride Embrittlement of High-burnup Zircaloy-4 Fuel Cladding

Daum, Robert S.; Majumdar, S.; Liu, Yung; Billone, M.C.

doi:10.3327/jnst.43.1054

Cited by 25 publications

(19 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ANSYS/Fluent computational fluid dynamics (CFD) package employs a simplified model to predict temperaturejump thermal-resistance at the interfaces between rarefied gases and solid surfaces. This model is similar to the one given by equations (6) and (7). However, it employs the collisiondiameter-based definition of the mean free path λd (Eq.…”

Section: Numerical Fluent Modelmentioning

confidence: 99%

“…The first is the Continuum Model, which does not include temperature jumps between the solid surfaces and the helium. The second is the Moderately-Rarefied Model, which includes the temperature jump thermal resistance described in equations (7) and (11). Simulations for this model are performed for pressure of P=500 Pa, and thermal accommodation coefficients of α=0.4 and 1 with LJ molecular diameters d=1.9 Å and 2.33 Å.…”

Section: Transfer Cask Modelmentioning

confidence: 99%

“…During all post-reactor drying, transfer, storage and transport operations the fuel cladding must be kept below certain temperature limits to avoid (a) dissolution of circumferential hydrides that exist in the cladding and (b) high gas pressures within the tubes, which leads to high cladding hoop stress [6]. If these hydrides dissolve and the hoop stresses become large, then as the heat generation of the used fuel decreases during long-term storage radial hydrides may form and cause the cladding to become brittle [7][8][9][10]. Drying operations [11] may be the most likely events to cause the fuel temperature to exceed temperature limits.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of Cladding Temperatures Within a Used Nuclear Fuel Transfer Cask Filled With Rarefied Helium

Manzo

Green

Nacer

et al. 2014

Volume 7: Operations, Applications and Components

View full text Add to dashboard Cite

During the used nuclear fuel vacuum drying process, helium is evacuated to pressures as low as 70 Pa, to promote water vaporization and removal. At these low pressures the gas is rarefied to the extent that there is a temperature jump thermal resistance between the surface and gas. This occurs when the mean free path of a molecule becomes a comparable to the characteristic length of a system. In order to correctly apply this jump model to a nuclear transfer cask, a two dimensional model of parallel plates and concentric cylinders were created using ANSYS/Fluent package. Heat generation was plotted against a variety of relevant pressures. The results in these simple geometries are compared to kinetic model calculations, performed by other investigators, to determine the appropriate collision diameters to use in rarefied helium gas simulations within complex geometries. A two dimensional mesh of a transfer cask containing 24 pressurized water reactor used fuel assemblies is then constructed, and the rarefied gas model was implemented in the helium-filled regions between the fuel and basket support structures. Steady state simulations with a fuel heat generation rate of 710 W/m/assemble shows that the cladding is measurably hotter when the helium gas pressure is reduced from atmospheric conditions ∼105 Pa to 500 Pa. The heat generation rate that brings the peak cladding temperature to a hydride dissolution temperature of 400°C is as much as 10% lower when the gas is at 500 Pa than under atmospheric conditions.

show abstract

Section: Numerical Fluent Modelmentioning

confidence: 99%

Section: Transfer Cask Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of Cladding Temperatures Within a Used Nuclear Fuel Transfer Cask Filled With Rarefied Helium

Manzo

Green

Nacer

et al. 2014

Volume 7: Operations, Applications and Components

View full text Add to dashboard Cite

show abstract

“…Refs. [24,26,27] rather than Zircaloy-2 [22,28]; ductility values are often presented versus total hydride content e.g. Refs.…”

Section: Discussionmentioning

confidence: 99%

“…Refs. [7,8,24,30,32,39]. When re-orientation tests are done by pressuring the tubes, the stress in the tube is generally kept constant [23,25,27].…”

Section: Hydride Re-orientation Testmentioning

confidence: 99%