TY - GEN
T1 - Update of the Nuclear Criticality Slide Rule
T2 - 2022 Nuclear Criticality Safety Division Topical Meeting, NCSD 2022
AU - Duluc, Matthieu
AU - Herth, Johann
AU - Adatte, Tristan
AU - Heinrichs, Dave
AU - Kim, Soon
AU - Bowen, Doug
AU - Celik, Cihangir
AU - Dupont, Mathieu
N1 - Publisher Copyright:
© 2022 Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting. All rights reserved.
PY - 2022
Y1 - 2022
N2 - IRSN (France), LLNL (USA) and ORNL (USA) began a long-term collaboration effort in 2015 to update the nuclear criticality Slide Rule (https://ncsp.llnl.gov/analytical-methods/criticality-sliderule) for the emergency response to a nuclear criticality accident. The Slide Rule permits the estimation of neutron and gamma dose rates and integrated doses based upon estimated fission yields, as a function of distance from the fission source, and time after criticality accidents for different critical systems. This paper presents the review of the section “estimation of the number of fissions”, named “fission yield” in the Slide Rule document. This estimation is important because the other information provided by the Slide Rule is directly proportional to the number of fissions. The previous models, based on Hansen and Barbry formulae, will be presented with their associated assumptions and limitations. Then, new proposals will be presented with a comparison to past criticality accidents and experimental data. The new formulae, based on the heat energy equation, cover many types of criticality accidents (solution, dry or low-moderated powder, rods/assemblies in water and dry metal) and require limited information in an emergency situation.
AB - IRSN (France), LLNL (USA) and ORNL (USA) began a long-term collaboration effort in 2015 to update the nuclear criticality Slide Rule (https://ncsp.llnl.gov/analytical-methods/criticality-sliderule) for the emergency response to a nuclear criticality accident. The Slide Rule permits the estimation of neutron and gamma dose rates and integrated doses based upon estimated fission yields, as a function of distance from the fission source, and time after criticality accidents for different critical systems. This paper presents the review of the section “estimation of the number of fissions”, named “fission yield” in the Slide Rule document. This estimation is important because the other information provided by the Slide Rule is directly proportional to the number of fissions. The previous models, based on Hansen and Barbry formulae, will be presented with their associated assumptions and limitations. Then, new proposals will be presented with a comparison to past criticality accidents and experimental data. The new formulae, based on the heat energy equation, cover many types of criticality accidents (solution, dry or low-moderated powder, rods/assemblies in water and dry metal) and require limited information in an emergency situation.
KW - Criticality accident
KW - Slide Rule
KW - number of fissions
UR - http://www.scopus.com/inward/record.url?scp=85202562154&partnerID=8YFLogxK
U2 - 10.13182/T126-37440
DO - 10.13182/T126-37440
M3 - Conference contribution
AN - SCOPUS:85202562154
T3 - Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting
SP - 446
EP - 455
BT - Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting
PB - American Nuclear Society
Y2 - 12 June 2022 through 16 June 2022
ER -