Confirmatory investigations on the flux effect and associated unstable matrix damage in RPV materials exposed to high neutron fluence

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Confirmatory investigations on the flux effect and associated unstable matrix damage in RPV materials exposed to high neutron fluence. / Chaouadi, Rachid; Gérard, Robert.

In: Journal of Nuclear Materials, Vol. 437, No. 1-3, 15.06.2013, p. 267-274.

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@article{c40abb806aa6436081bcc5a875eda462,
title = "Confirmatory investigations on the flux effect and associated unstable matrix damage in RPV materials exposed to high neutron fluence",
abstract = "This paper provides additional experimental data on the neutron flux effect on RPV hardening and embrittlement and on the so-called unstable matrix damage that was suggested to occur at high flux. Six materials taken from the first irradiation surveillance capsules of Belgian PWRs with a fluence not exceeding about 1.5 E19 n/cm² were further irradiated in the BR2 high flux reactor to additional fluences ranging between about 1 and 1.5 E20 n/cm² at 290 °C. Eight additional RPV materials were selected to investigate the flux effect on irradiation hardening. No statistically-significant difference in irradiation hardening for low and high flux could be evidenced from the null hypothesis test applied with the general linear model. This is confirmed by additional experiments where fourteen irradiated specimens of various RPV materials consisting of low to high Cu and Ni contents were annealed at 350 °C for 5 h to eventually reveal some recovery of the unstable matrix damage. The results did not show any recovery upon heat treatment, which indicates that unstable matrix defects did not appear in these materials during irradiation at high flux.",
keywords = "post-irradiation annealing , neutron flux, unstable matrix damage, reactor pressure vessel",
author = "Rachid Chaouadi and Robert G{\'e}rard",
note = "Score=10",
year = "2013",
month = jun,
day = "15",
doi = "10.1016/j.jnucmat.2013.02.029",
language = "English",
volume = "437",
pages = "267--274",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",
number = "1-3",

}

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TY - JOUR

T1 - Confirmatory investigations on the flux effect and associated unstable matrix damage in RPV materials exposed to high neutron fluence

AU - Chaouadi, Rachid

AU - Gérard, Robert

N1 - Score=10

PY - 2013/6/15

Y1 - 2013/6/15

N2 - This paper provides additional experimental data on the neutron flux effect on RPV hardening and embrittlement and on the so-called unstable matrix damage that was suggested to occur at high flux. Six materials taken from the first irradiation surveillance capsules of Belgian PWRs with a fluence not exceeding about 1.5 E19 n/cm² were further irradiated in the BR2 high flux reactor to additional fluences ranging between about 1 and 1.5 E20 n/cm² at 290 °C. Eight additional RPV materials were selected to investigate the flux effect on irradiation hardening. No statistically-significant difference in irradiation hardening for low and high flux could be evidenced from the null hypothesis test applied with the general linear model. This is confirmed by additional experiments where fourteen irradiated specimens of various RPV materials consisting of low to high Cu and Ni contents were annealed at 350 °C for 5 h to eventually reveal some recovery of the unstable matrix damage. The results did not show any recovery upon heat treatment, which indicates that unstable matrix defects did not appear in these materials during irradiation at high flux.

AB - This paper provides additional experimental data on the neutron flux effect on RPV hardening and embrittlement and on the so-called unstable matrix damage that was suggested to occur at high flux. Six materials taken from the first irradiation surveillance capsules of Belgian PWRs with a fluence not exceeding about 1.5 E19 n/cm² were further irradiated in the BR2 high flux reactor to additional fluences ranging between about 1 and 1.5 E20 n/cm² at 290 °C. Eight additional RPV materials were selected to investigate the flux effect on irradiation hardening. No statistically-significant difference in irradiation hardening for low and high flux could be evidenced from the null hypothesis test applied with the general linear model. This is confirmed by additional experiments where fourteen irradiated specimens of various RPV materials consisting of low to high Cu and Ni contents were annealed at 350 °C for 5 h to eventually reveal some recovery of the unstable matrix damage. The results did not show any recovery upon heat treatment, which indicates that unstable matrix defects did not appear in these materials during irradiation at high flux.

KW - post-irradiation annealing

KW - neutron flux

KW - unstable matrix damage

KW - reactor pressure vessel

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/27907990

U2 - 10.1016/j.jnucmat.2013.02.029

DO - 10.1016/j.jnucmat.2013.02.029

M3 - Article

VL - 437

SP - 267

EP - 274

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - 1-3

ER -

ID: 3751037