Results 111 to 120 of about 177 (148)

A model of chemistry and thermal hydraulics in PWR fuel crud deposits

Journal of Nuclear Materials, 2006
Abstract A model is described for simulating thermal hydraulic and chemical conditions within fuel crud deposits. Heat transfer takes place by wick boiling in which water flows through the porous deposit and evaporates into steam at the surface of chimneys. The transport and chemistry of dissolved species within the deposit is also modelled.
Jim Henshaw, John C. McGurk, Howard E. Sims, Ann Tuson, Shirley Dickinson, Jeff Deshon   +5 more
openaire   +1 more source

Deposition of Model Crud on Boiling Zircaloy Surfaces at High Temperature

Nuclear Technology, 1983
The deposition experiments were carried out under high pressure (7 MPa) at 285/sup 0/C using model compounds (..cap alpha..-hematite) to investigate the deposition process of crud on boiling surfaces. The effects of several factors, such as the diameter of the model particles (0.15 to 2.3 ..mu..m), pH (7 to 13), and heat flux of the heated surfaces (5 ...
Mitsuo Kawaguchi, Kenkichi Ishigure, Norihiko Fujita, Keichi Oshima   +3 more
openaire   +1 more source

Role of Surface Chemistry in Crud Deposition on Heat Transfer Surface

Corrosion, 1979
Crud deposition on fuel cladding in light water reactors is the source of induced radioactivity which contaminates the reactor coolant system when released. The deposition behavior of hematite particles (crud) on heat transfer surfaces was studied experimentally at atmospheric pressure.
T. Iwahori, T. Mizuno, H. Kōyama
openaire   +1 more source

Single Rod Heat Transfer Tests to Study the Effects of Crud Deposition

Volume 2: Thermal Hydraulics, 2006
Researchers have performed many studies to try to understand crud formation on the fuel pin clad surfaces, which has been observed in pressurized water reactors (PWR) as a result of sub-cooled nucleate boiling and precipitation reactions. Crud deposits, may cause an unexpected change in core power distribution known as crud induced power shift (CIPS ...
G. Wang, W. A. Byers, Z. E. Karoutas, L. E. Hochreiter, M. Y. Young, R. J. Jacko   +5 more
openaire   +1 more source

Modeling of Porous Crud Layer Based on Effects of Diffusion and Water Radiolysis on Anomalous Porous Crud Deposition on Fuel Pin Surfaces in PWRs

10th International Conference on Nuclear Engineering, Volume 4, 2002
Many studies have been undertaken to understand crud formation on the upper spans of fuel pin clad surfaces, which is called axial offset anomaly (AOA), is observed in pressurized water reactors (PWR) as a result of sub-cooled nucleate boiling. Separately, researchers have considered the effect of water radiolysis in the primary coolant of PWR.
Hyun-Jong Joe, Barclay G. Jones
openaire   +1 more source

Analyses of crud deposits on fuel rods in PWRs using Mössbauer spectroscopy

Journal of Nuclear Materials, 2010
Abstract To assess the influence of boron iron compounds deposited on fuel rods on unexpected power shifts in pressurized water reactors, samples of crud scrapes retrieved during refuelling from three reactor cores were analyzed using 57 Fe Mossbauer spectroscopy.
openaire   +1 more source

Study on Thermal Conductivity Model for Porous PWR CRUD Depositions

Volume 11: Student Paper Competition
Abstract In this study, corrosion product deposition test is carried out to measure effective thermal conductivity of CRUD depositions. Effective thermal conductivity is found to be a function of heat flux with an average value of 1.3866 W/(m × K).
Yan Liu, Xiaojing Liu, Hui He, Tengfei Zhang, Xiang Chai   +4 more
openaire   +1 more source

Finite Element Modelling of the Electrokinetic Mechanism of CRUD Deposition in Accelerating Flow [PDF]

, 2020
An electric model using the finite element method (FEM) has been generated to verify the electrokinetic phenomenon that has been postulated to be responsible for the localised corrosion deposition (CRUD) in the nuclear industry. The model shows that the acceleration of a resistive fluid through a micrometre scale pipe restriction leads to the spatial ...
Connolly, Brian; id_orcid 0000-0003-3075-8333, Stevens, Nicholas; id_orcid 0000-0002-2317-827X, Scenini, Fabio; id_orcid 0000-0002-8974-4860   +2 more
openaire  

Model of the Deposition of Colloidal Crud Particles on the Fuel Elements of Nuclear Power Plants

Nuclear Science and Engineering, 1983
Experimental data on the adhesion of ..cap alpha..-Fe/sub 2/O/sub 3/ on large ZrO/sub 2/ pellets are presented and discussed in terms of the colloidal interactions of the two double layers. The pH dependence of adhesion is thus explained. The relevance of colloidal interactions of this type in reactor conditions is then discussed, through the ...
Guillermo A. Urrutia, Susana I. Passaggio, A. J. G. Maroto, Miguel A. Blesa   +3 more
openaire   +1 more source

CRUD deposition induced multi-physics effects analysis in PWR

Nuclear Engineering and Design, 2023
Shiwei Wang, Xiaojing Liu, Xiang Chai, Tengfei Zhang, Hui He   +4 more
openaire   +1 more source