Update of the Nuclear Criticality Slide Rule Calculations: Plutonium systems - Delayed Fission Gamma

Johann Herth; Matthieu Duluc; Tristan Adatte; Dave Heinrichs; Soon Kim; Doug Bowen; Cihangir Celik; Mathieu Dupont

doi:10.13182/T126-37443

Update of the Nuclear Criticality Slide Rule Calculations: Plutonium systems - Delayed Fission Gamma

Johann Herth, Matthieu Duluc, Tristan Adatte, Dave Heinrichs, Soon Kim, Doug Bowen, Cihangir Celik, Mathieu Dupont

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

IRSN (France), LLNL (USA) and ORNL (USA) began a long-term collaboration effort in 2015 to update the nuclear criticality Slide Rule 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 results from the fourth phase of the current update of the Slide Rule project [1], in which delayed fission-product gamma (DFG) dose rates of unreflected plutonium critical systems were compared by several modern 3D radiation transport codes (MCNP, COG, SCALE), using updated flux-to-dose conversion factors. Dose rates are calculated for fissile material at five moderation ratios (H/Pu), at 1 m above the ground as a function of distance (between 30 cm and 1,200 m) from the external surface of the source to the center of the detector, and for periods between 1 s and 1,000 min after the critical instantaneous event. Further efforts have been devoted to the determination of the delayed gamma source, by comparing the time-dependent energy spectra obtained from several methods. Overall, DFG dose rates calculated by each participant led to consistent results. Extra effort is under way to identify the cause of the remaining differences, by comparing precisely the gamma source, and particularly nuclides inventories.

Original language	English
Title of host publication	Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting
Publisher	American Nuclear Society
Pages	456-463
Number of pages	8
ISBN (Electronic)	9780894487859
DOIs	https://doi.org/10.13182/T126-37443
State	Published - 2022
Event	2022 Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Anaheim, United States Duration: Jun 12 2022 → Jun 16 2022

Publication series

Name	Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting

Conference

Conference	2022 Nuclear Criticality Safety Division Topical Meeting, NCSD 2022
Country/Territory	United States
City	Anaheim
Period	06/12/22 → 06/16/22

Funding

This work was performed under the auspices of the U.S. Department of Energy by Oak Ridge National Laboratory and Lawrence Livermore National Laboratory under contracts DE-AC05-00OR22725 and DEAC52-07NA27344, respectively, and was funded by the U.S. Department of Energy Nuclear Criticality Safety Program and by Institut de Radioprotection et de S\u00FBret\u00E9 Nucl\u00E9aire.

Keywords

delayed gamma
dose
nuclear criticality accident
plutonium
slide-rule

Access to Document

10.13182/T126-37443

Cite this

Herth, J., Duluc, M., Adatte, T., Heinrichs, D., Kim, S., Bowen, D., Celik, C., & Dupont, M. (2022). Update of the Nuclear Criticality Slide Rule Calculations: Plutonium systems - Delayed Fission Gamma. In Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting (pp. 456-463). (Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting). American Nuclear Society. https://doi.org/10.13182/T126-37443

Herth, Johann ; Duluc, Matthieu ; Adatte, Tristan et al. / Update of the Nuclear Criticality Slide Rule Calculations : Plutonium systems - Delayed Fission Gamma. Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting. American Nuclear Society, 2022. pp. 456-463 (Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting).

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abstract = "IRSN (France), LLNL (USA) and ORNL (USA) began a long-term collaboration effort in 2015 to update the nuclear criticality Slide Rule 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 results from the fourth phase of the current update of the Slide Rule project [1], in which delayed fission-product gamma (DFG) dose rates of unreflected plutonium critical systems were compared by several modern 3D radiation transport codes (MCNP, COG, SCALE), using updated flux-to-dose conversion factors. Dose rates are calculated for fissile material at five moderation ratios (H/Pu), at 1 m above the ground as a function of distance (between 30 cm and 1,200 m) from the external surface of the source to the center of the detector, and for periods between 1 s and 1,000 min after the critical instantaneous event. Further efforts have been devoted to the determination of the delayed gamma source, by comparing the time-dependent energy spectra obtained from several methods. Overall, DFG dose rates calculated by each participant led to consistent results. Extra effort is under way to identify the cause of the remaining differences, by comparing precisely the gamma source, and particularly nuclides inventories.",

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Herth, J, Duluc, M, Adatte, T, Heinrichs, D, Kim, S, Bowen, D , Celik, C & Dupont, M 2022, Update of the Nuclear Criticality Slide Rule Calculations: Plutonium systems - Delayed Fission Gamma. in Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting. Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting, American Nuclear Society, pp. 456-463, 2022 Nuclear Criticality Safety Division Topical Meeting, NCSD 2022, Anaheim, United States, 06/12/22. https://doi.org/10.13182/T126-37443

Update of the Nuclear Criticality Slide Rule Calculations: Plutonium systems - Delayed Fission Gamma. / Herth, Johann; Duluc, Matthieu; Adatte, Tristan et al.
Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting. American Nuclear Society, 2022. p. 456-463 (Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Kim, Soon

AU - Bowen, Doug

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AB - IRSN (France), LLNL (USA) and ORNL (USA) began a long-term collaboration effort in 2015 to update the nuclear criticality Slide Rule 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 results from the fourth phase of the current update of the Slide Rule project [1], in which delayed fission-product gamma (DFG) dose rates of unreflected plutonium critical systems were compared by several modern 3D radiation transport codes (MCNP, COG, SCALE), using updated flux-to-dose conversion factors. Dose rates are calculated for fissile material at five moderation ratios (H/Pu), at 1 m above the ground as a function of distance (between 30 cm and 1,200 m) from the external surface of the source to the center of the detector, and for periods between 1 s and 1,000 min after the critical instantaneous event. Further efforts have been devoted to the determination of the delayed gamma source, by comparing the time-dependent energy spectra obtained from several methods. Overall, DFG dose rates calculated by each participant led to consistent results. Extra effort is under way to identify the cause of the remaining differences, by comparing precisely the gamma source, and particularly nuclides inventories.

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Herth J, Duluc M, Adatte T, Heinrichs D, Kim S, Bowen D et al. Update of the Nuclear Criticality Slide Rule Calculations: Plutonium systems - Delayed Fission Gamma. In Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting. American Nuclear Society. 2022. p. 456-463. (Proceedings of the Nuclear Criticality Safety Division Topical Meeting, NCSD 2022 - Embedded with the 2022 ANS Annual Meeting). doi: 10.13182/T126-37443

Update of the Nuclear Criticality Slide Rule Calculations: Plutonium systems - Delayed Fission Gamma

Abstract

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Keywords

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