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A study of solute transport of radiolysis products in crud and its effects on crud growth on PWR fuel pin

Journal Article · · Nuclear Engineering and Design
 [1];  [2];  [3]
  1. BNF Consulting, Mt Kisco, NY (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Illinois, Urbana-Champaign, IL (United States)
+ Show Author Affiliations
Our research examines the concentration of radiolysis species (H2, O2, and H2O2) over the porous crud layer using a three dimensional time dependent solute transport model. A Monte Carlo random walk technique is adopted to simulate the transport behavior of the different species with various parametric studies of source term, crud thickness, and crud porosity. Particularly, this model employs a system of coupled mass transport and chemical interactions as the source term, which makes the problem non-linear. We also demonstrate that a negligible effect on radiolysis species concentrations change due to the consideration of source term. The crud thickness and porosity effect on the concentration distributions are notably observed. In general, higher concentration starts from the intersection of the heating surface with the chimney wall from the beginning and it reaches the equilibrium state within tens of seconds. The concentration profiles of the radiolysis species H2, O2, and H2O2 can be directly related to corrosion issues. Furthermore, the direct application of this study to nuclear engineering research is to aid in the design of reactors with higher performance without experiencing an Axial Offset Anomaly (AOA), an unexpected measured shift in axial power distribution from predicted values.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC52-06NA25396
OSTI ID:
1304708
Report Number(s):
LA-UR--15-23732
Journal Information:
Nuclear Engineering and Design, Journal Name: Nuclear Engineering and Design Journal Issue: C Vol. 300; ISSN 0029-5493
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

References (8)

Concentration levels of solutes in porous deposits with chimneys under wick boiling conditions journal February 1987
Temperature dependence of the rate constant for reactions of hydrated electrons with H, OH and H2O2 journal June 1994
The Solubility of Nickel Ferrite in Aqueous Boric Acid Solution journal February 1981
The impact of radiolytic yield on the calculated ECP in PWR primary coolant circuits journal May 2007
Formation and dissolution of oxide film on zirconium alloys in 288°C pure water under γ-ray irradiation journal September 1997
The influence of water chemistry on the radiolysis of the primary coolant water in pressurized water reactors journal January 1999
The Monte Carlo Method journal September 1949
Radiolysis of water at elevated temperatures—III. Simulation of radiolytic products at 25 and 250°C under the irradiation with γ-rays and fast neutrons journal May 1995

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