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

Conference · Mon Jul 01 04:00:00 EDT 2002

OSTI ID:21072769

Joe, Hyun-Jong; Jones, Barclay G ^[1]

---

1. University of Illinois at Urbana-Champaign, 104 South Wright Street, Urbana, IL 61801 (United States)

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. This study examines the effects of radiolysis of liquid water, which aggressively participate in general cladding corrosion and solutes within the primary coolant system, in the terms of pH, temperature, and Linear Energy Transfer (LET). It also discusses the effect of mass transfer, especially diffusion, on the concentration distribution of the radiolytic products, H{sub 2} and O{sub 2}, in the porous crud layer. Finally it covers the effects of chemical reactions of boric acid (H{sub 3}BO{sub 3}), which has a negative impact on the mechanisms of water recombination with hydrogen, lithium hydroxide (LiOH), which has a negative effect on water decomposition, dissolved hydrogen (DH), and some trace impurities. (authors)

• Research Organization: The ASME Foundation, Inc., Three Park Avenue, New York, NY 10016-5990 (United States)
• OSTI ID: 21072769
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BORIC ACID
CLADDING
CORROSION
DIFFUSION
FUEL PINS
HYDROGEN
LAYERS
LET
LIQUIDS
LITHIUM HYDROXIDES
MASS TRANSFER
NUCLEATE BOILING
POROUS MATERIALS
PRIMARY COOLANT CIRCUITS
PWR TYPE REACTORS
RADIOLYSIS
SIMULATION
SURFACES
WATER