Rossi-α experiment in the IPEN/MB-01 research reactor: Validation of two-region model and absolute measurement of βeff and Λ

Renato Kuramoto; Adimir Dos Santos; Rogério Jerez; Ricardo Diniz; Ulysses D.Utra Bitelli; Tufic Madi Filho; Cesar Luis Veneziani

Rossi-α experiment in the IPEN/MB-01 research reactor: Validation of two-region model and absolute measurement of β_eff and Λ

Renato Kuramoto
, Adimir Dos Santos
, Rogério Jerez
, Ricardo Diniz
, Ulysses D.Utra Bitelli
, Tufic Madi Filho
, Cesar Luis Veneziani

Criticality Safety Analysis and Research

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

3 Scopus citations

Abstract

A new method for absolute measurement of the effective delayed neutron fraction, β_eff, and the prompt neutron generation time, Λ, based on Rossi- α experiments and the Two-Region Model was developed at the IPEN/MB-01 Research Reactor facility. In contrast with other techniques like the Slope Method, Nelson-Number Method and ²⁵²Cf- Source Method, the main advantage of this new methodology is to obtain the parameters in a purely experimental way, eliminating all parameters that are difficult to measure or calculate. In this way, Rossi-α experiments for validation of this method were performed at the IPEN/MB-01 facility. The final results agree well with values from frequency analysis experiments and show uncertainties of 1.46% and 0.97% for β_eff, and Λ respectively. This work supports the reduction of the ²³⁵U thermal yield as proposed by Okajima and Sakurai.

Original language	English
Title of host publication	PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics
Publisher	American Nuclear Society
ISBN (Print)	0894486977, 9780894486975
State	Published - 2006
Event	PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics - Vancouver, BC, Canada Duration: Sep 10 2006 → Sep 14 2006

Publication series

Name	PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics
Volume	2006

Conference

Conference	PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics
Country/Territory	Canada
City	Vancouver, BC
Period	09/10/06 → 09/14/06

Keywords

Effective delayed neutron fraction
Prompt neutron generation time
Rossi-α
Two-region model

Cite this

Kuramoto, R., Dos Santos, A., Jerez, R., Diniz, R., Bitelli, U. D. U., Madi Filho, T., & Veneziani, C. L. (2006). Rossi-α experiment in the IPEN/MB-01 research reactor: Validation of two-region model and absolute measurement of β_eff and Λ. In PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics (PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics; Vol. 2006). American Nuclear Society.

Kuramoto, Renato ; Dos Santos, Adimir ; Jerez, Rogério et al. / Rossi-α experiment in the IPEN/MB-01 research reactor : Validation of two-region model and absolute measurement of β_eff and Λ. PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics. American Nuclear Society, 2006. (PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics).

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title = "Rossi-α experiment in the IPEN/MB-01 research reactor: Validation of two-region model and absolute measurement of βeff and Λ",

abstract = "A new method for absolute measurement of the effective delayed neutron fraction, βeff, and the prompt neutron generation time, Λ, based on Rossi- α experiments and the Two-Region Model was developed at the IPEN/MB-01 Research Reactor facility. In contrast with other techniques like the Slope Method, Nelson-Number Method and 252Cf- Source Method, the main advantage of this new methodology is to obtain the parameters in a purely experimental way, eliminating all parameters that are difficult to measure or calculate. In this way, Rossi-α experiments for validation of this method were performed at the IPEN/MB-01 facility. The final results agree well with values from frequency analysis experiments and show uncertainties of 1.46\% and 0.97\% for βeff, and Λ respectively. This work supports the reduction of the 235U thermal yield as proposed by Okajima and Sakurai.",

keywords = "Effective delayed neutron fraction, Prompt neutron generation time, Rossi-α, Two-region model",

author = "Renato Kuramoto and \{Dos Santos\}, Adimir and Rog{\'e}rio Jerez and Ricardo Diniz and Bitelli, \{Ulysses D.Utra\} and \{Madi Filho\}, Tufic and Veneziani, \{Cesar Luis\}",

year = "2006",

language = "English",

isbn = "0894486977",

series = "PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics",

publisher = "American Nuclear Society",

booktitle = "PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics",

note = "PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics ; Conference date: 10-09-2006 Through 14-09-2006",

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Kuramoto, R, Dos Santos, A, Jerez, R, Diniz, R, Bitelli, UDU, Madi Filho, T & Veneziani, CL 2006, Rossi-α experiment in the IPEN/MB-01 research reactor: Validation of two-region model and absolute measurement of β_eff and Λ. in PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics. PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics, vol. 2006, American Nuclear Society, PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics, Vancouver, BC, Canada, 09/10/06.

Rossi-α experiment in the IPEN/MB-01 research reactor: Validation of two-region model and absolute measurement of β_eff and Λ. / Kuramoto, Renato; Dos Santos, Adimir; Jerez, Rogério et al.
PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics. American Nuclear Society, 2006. (PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics; Vol. 2006).

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

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AU - Kuramoto, Renato

AU - Dos Santos, Adimir

AU - Jerez, Rogério

AU - Diniz, Ricardo

AU - Bitelli, Ulysses D.Utra

AU - Madi Filho, Tufic

AU - Veneziani, Cesar Luis

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N2 - A new method for absolute measurement of the effective delayed neutron fraction, βeff, and the prompt neutron generation time, Λ, based on Rossi- α experiments and the Two-Region Model was developed at the IPEN/MB-01 Research Reactor facility. In contrast with other techniques like the Slope Method, Nelson-Number Method and 252Cf- Source Method, the main advantage of this new methodology is to obtain the parameters in a purely experimental way, eliminating all parameters that are difficult to measure or calculate. In this way, Rossi-α experiments for validation of this method were performed at the IPEN/MB-01 facility. The final results agree well with values from frequency analysis experiments and show uncertainties of 1.46% and 0.97% for βeff, and Λ respectively. This work supports the reduction of the 235U thermal yield as proposed by Okajima and Sakurai.

AB - A new method for absolute measurement of the effective delayed neutron fraction, βeff, and the prompt neutron generation time, Λ, based on Rossi- α experiments and the Two-Region Model was developed at the IPEN/MB-01 Research Reactor facility. In contrast with other techniques like the Slope Method, Nelson-Number Method and 252Cf- Source Method, the main advantage of this new methodology is to obtain the parameters in a purely experimental way, eliminating all parameters that are difficult to measure or calculate. In this way, Rossi-α experiments for validation of this method were performed at the IPEN/MB-01 facility. The final results agree well with values from frequency analysis experiments and show uncertainties of 1.46% and 0.97% for βeff, and Λ respectively. This work supports the reduction of the 235U thermal yield as proposed by Okajima and Sakurai.

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Kuramoto R, Dos Santos A, Jerez R, Diniz R, Bitelli UDU, Madi Filho T et al. Rossi-α experiment in the IPEN/MB-01 research reactor: Validation of two-region model and absolute measurement of β_eff and Λ. In PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics. American Nuclear Society. 2006. (PHYSOR-2006 - American Nuclear Society's Topical Meeting on Reactor Physics).