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Characterisation of RBMK-1500 graphite : A method to identify the neutron activation and surface contamination terms

Remeikis, V. ; Plukienė, R. ; Plukis, A. ; Barkauskas, V. LU ; Gudelis, A. ; Druteikienė, R. ; Gvozdaitė, R. ; Juodis, L. ; Duškesas, G. and Lagzdina, E. , et al. (2020) In Nuclear Engineering and Design 361.
Abstract

In this study, we provide the results of radiological characterization of the RBMK-1500 graphite using modeling and nuclear spectrometry; we also introduce a method to identify neutron activation and surface contamination terms for the spent graphite waste. The simplified model of the reactor core created by programme package SCALE 6.2 for 4 × 4 fragment of the core was used for simulation of neutron activation of graphite impurities in the RBMK-1500 reactor. Calculations were supplemented by the non-destructive measurements of gamma-ray emitting nuclides and destructive analysis of selected samples of the graphite stack of Ignalina NPP Unit 1 reactor. Our analysis demonstrates that the partial contribution of different contamination... (More)

In this study, we provide the results of radiological characterization of the RBMK-1500 graphite using modeling and nuclear spectrometry; we also introduce a method to identify neutron activation and surface contamination terms for the spent graphite waste. The simplified model of the reactor core created by programme package SCALE 6.2 for 4 × 4 fragment of the core was used for simulation of neutron activation of graphite impurities in the RBMK-1500 reactor. Calculations were supplemented by the non-destructive measurements of gamma-ray emitting nuclides and destructive analysis of selected samples of the graphite stack of Ignalina NPP Unit 1 reactor. Our analysis demonstrates that the partial contribution of different contamination sources can be identified by combining modeling and measurements. The findings on radionuclides such as 14C, 36Cl, 60Co, 134Cs, 137Cs, 154Eu as well as actinides in Ignalina NPP Unit 1 graphite having a significant impact on graphite activity and radiological characterization are discussed. The proposed method is also applicable for identification of contamination source in the other activated components of the reactor core.

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publishing date
type
Contribution to journal
publication status
published
keywords
Irradiated graphite, Nuclear spectrometry, RBMK-1500 reactor, SCALE 6.2 modeling
in
Nuclear Engineering and Design
volume
361
article number
110501
publisher
Elsevier
external identifiers
  • scopus:85077926608
ISSN
0029-5493
DOI
10.1016/j.nucengdes.2019.110501
language
English
LU publication?
no
id
7a5fed7b-66e2-4ecf-a39e-c958687d27f5
date added to LUP
2020-04-03 14:35:15
date last changed
2022-06-30 20:46:12
@article{7a5fed7b-66e2-4ecf-a39e-c958687d27f5,
  abstract     = {{<p>In this study, we provide the results of radiological characterization of the RBMK-1500 graphite using modeling and nuclear spectrometry; we also introduce a method to identify neutron activation and surface contamination terms for the spent graphite waste. The simplified model of the reactor core created by programme package SCALE 6.2 for 4 × 4 fragment of the core was used for simulation of neutron activation of graphite impurities in the RBMK-1500 reactor. Calculations were supplemented by the non-destructive measurements of gamma-ray emitting nuclides and destructive analysis of selected samples of the graphite stack of Ignalina NPP Unit 1 reactor. Our analysis demonstrates that the partial contribution of different contamination sources can be identified by combining modeling and measurements. The findings on radionuclides such as <sup>14</sup>C, <sup>36</sup>Cl, <sup>60</sup>Co, <sup>134</sup>Cs, <sup>137</sup>Cs, <sup>154</sup>Eu as well as actinides in Ignalina NPP Unit 1 graphite having a significant impact on graphite activity and radiological characterization are discussed. The proposed method is also applicable for identification of contamination source in the other activated components of the reactor core.</p>}},
  author       = {{Remeikis, V. and Plukienė, R. and Plukis, A. and Barkauskas, V. and Gudelis, A. and Druteikienė, R. and Gvozdaitė, R. and Juodis, L. and Duškesas, G. and Lagzdina, E. and Germanas, D. and Ridikas, D. and Krutovcov, S.}},
  issn         = {{0029-5493}},
  keywords     = {{Irradiated graphite; Nuclear spectrometry; RBMK-1500 reactor; SCALE 6.2 modeling}},
  language     = {{eng}},
  month        = {{01}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Engineering and Design}},
  title        = {{Characterisation of RBMK-1500 graphite : A method to identify the neutron activation and surface contamination terms}},
  url          = {{http://dx.doi.org/10.1016/j.nucengdes.2019.110501}},
  doi          = {{10.1016/j.nucengdes.2019.110501}},
  volume       = {{361}},
  year         = {{2020}},
}