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Lundgren, M. (2010) Analysis of predictive models for correlation of irradiation effects on pressure vessel steels. Göteborg : Chalmers University of Technology (CTH-NT - Chalmers University of Technology, Nuclear Engineering, nr: 233).
BibTeX
@mastersthesis{
Lundgren2010,
author={Lundgren, Martin},
title={Analysis of predictive models for correlation of irradiation effects on pressure vessel steels},
abstract={The reactor pressure vessel steel of a nuclear power plant is subjected to fast
neutron induced embrittlement. More speciffcally, hardening nanofeatures are produced within the materials by the neutron bombardment, which is of importance
for the toughness of the material. The decrease in toughness is characterized by the
change in ductile to brittle transition temperature.
A number of predictive semi-empirical models, for evaluation of the transition
temperature shift, ΔT, have been compared, considering the Ringhals units 3 and 4
base metal data. The US Regulatory Guide 1.99 Revision 1, followed by the French
FIM and Miannay formulas, is found to best agree with the results for all Ringhals
units 3 and 4 base materials.
The transition temperature shift is found to follow a high exponent (& 0:5)fluence behavior, and lacks a significant saturation effect. This conclusion is drawn
both from the comparison of semi-empirical models, and from calculations by the
least squares method.
An effect of the copper content on ΔT is clear for the base metals. Also, next
to Cu, analysis indicates strongest ΔT correlations with manganese, considering
elemental contents of impurities and alloying elements in the materials. When also
the weld metals are taken into account, this effect becomes more pronounced and
is found to follow the same behavior as among base materials. While correlations
between the data and manganese are strong, effects of nickel and other elements
remain uncertain.
Comparing data among Ringhals unit 2 materials, an effect of the neutron flux
is noticeable. Here, half the samples are subjected to a twice as large neutron flux,
and display higher temperature shifts, compared to the other half.
It needs to be noted that the database is rather small, i.e. fourteen and nine
discrete data points for the base- and weld metals, respectively. Hence, all results
are of poor significant quality and additional effects may be recognized when further
data is added.},
publisher={Institutionen för teknisk fysik, Nukleär teknik, Chalmers tekniska högskola},
place={Göteborg},
year={2010},
series={CTH-NT - Chalmers University of Technology, Nuclear Engineering, no: 233},
keywords={Neutron irradiation, RPV embrittlement, surveillance programmes, matrix features, CRP, MNP, ductile, brittle, transition temperature shift, Charpy-V notch impact testing, neutron fluence, flux, PERFECT},
note={59},
}
RefWorks
RT Generic
SR Print
ID 146687
A1 Lundgren, Martin
T1 Analysis of predictive models for correlation of irradiation effects on pressure vessel steels
YR 2010
AB The reactor pressure vessel steel of a nuclear power plant is subjected to fast
neutron induced embrittlement. More speciffcally, hardening nanofeatures are produced within the materials by the neutron bombardment, which is of importance
for the toughness of the material. The decrease in toughness is characterized by the
change in ductile to brittle transition temperature.
A number of predictive semi-empirical models, for evaluation of the transition
temperature shift, ΔT, have been compared, considering the Ringhals units 3 and 4
base metal data. The US Regulatory Guide 1.99 Revision 1, followed by the French
FIM and Miannay formulas, is found to best agree with the results for all Ringhals
units 3 and 4 base materials.
The transition temperature shift is found to follow a high exponent (& 0:5)fluence behavior, and lacks a significant saturation effect. This conclusion is drawn
both from the comparison of semi-empirical models, and from calculations by the
least squares method.
An effect of the copper content on ΔT is clear for the base metals. Also, next
to Cu, analysis indicates strongest ΔT correlations with manganese, considering
elemental contents of impurities and alloying elements in the materials. When also
the weld metals are taken into account, this effect becomes more pronounced and
is found to follow the same behavior as among base materials. While correlations
between the data and manganese are strong, effects of nickel and other elements
remain uncertain.
Comparing data among Ringhals unit 2 materials, an effect of the neutron flux
is noticeable. Here, half the samples are subjected to a twice as large neutron flux,
and display higher temperature shifts, compared to the other half.
It needs to be noted that the database is rather small, i.e. fourteen and nine
discrete data points for the base- and weld metals, respectively. Hence, all results
are of poor significant quality and additional effects may be recognized when further
data is added.
PB Institutionen för teknisk fysik, Nukleär teknik, Chalmers tekniska högskola,
T3 CTH-NT - Chalmers University of Technology, Nuclear Engineering, no: 233
LA eng
OL 30
