Measurements of Delayed Neutron Decay Constants and Fission Yields from235U,237Np,241Am, and243Am

Saleh, H. H.; Parish, T.A.; Raman, S.; Shinohara, Nobuo

doi:10.13182/nse97-a24253

Cited by 21 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following Keepin's experiment, a plethora of experiments have been conducted to determine the delayed neutron yield and group parameters for different actinides, with a focus on U-235 DND parameters. For example, Cox et al [17] conducted a study on Cf-252, Cox [18] analyzed the delayed neutron emission from Pu-241, Gudkov et al [19] performed a delayed neutron study based on irradiating various actinide samples in a fast reactor, Loaiza et al [20] measured the group parameters of Np-237 and U-235 from fast fission, and Saleh et al [21] used the Texas A & M research reactor to study the delayed neutron emission from thermal fission of U-235, Np-237, Am-241, and Am-243.…”

Section: Delayed Neutron Datamentioning

confidence: 99%

Data-Driven and Precursor-Group Uncertainty Propagation of Lattice Kinetic Parameters in UAM Benchmark

Radaideh

Kozłowski

Wieselquist

et al. 2019

Science and Technology of Nuclear Installations

View full text Add to dashboard Cite

A new data-driven sampling-based framework was developed for uncertainty quantification (UQ) of the homogenized kinetic parameters calculated by lattice physics codes such as TRITON and Polaris. In this study, extension of the database for the delayed neutron data (DND) is performed by exploring more delayed neutron experiments and adding additional isotopes/actinides to the data libraries. Afterwards, the framework is utilized to obtain a deeper knowledge of the kinetic parameters’ sensitivity and uncertainty. The kinetic parameters include precursor-group-wise delayed neutron fraction (DNF) and decay constant. Input uncertainties include nuclear data (i.e., cross-sections) and DND (i.e., precursor group parameters and fractional delayed neutron yield). It is found that kinetic parameters, especially DNFs, have large uncertainties. The DNF uncertainty is driven by the cross-section uncertainties for LWR designs, while decay constant uncertainty is dominated by the DND uncertainties. The usage of correlated U-235 thermal DND in the UQ process significantly reduces the DND uncertainty contribution on the kinetic parameters. Large void fraction and presence of neutron absorber (e.g., control rod) increase the DNF uncertainty due to the hardening of neutron spectrum. High correlation between the DNF groups (β1,..,β6) is observed, while the decay constant groups (λ1,..,λ6) show weak correlation to each other and also to DNF groups. The DNF uncertainties of the dominant precursor group 4 for PWR, BWR, and VVER are about 7.5%, 9.4%, and 7.6%, respectively. The DNF uncertainty grows to larger values after fuel burnup. Kinetic parameters’ values and uncertainties provided here can be efficiently used in subsequent core calculations, point reactor kinetics, and other applications.

show abstract

Section: Delayed Neutron Datamentioning

confidence: 99%

Data-Driven and Precursor-Group Uncertainty Propagation of Lattice Kinetic Parameters in UAM Benchmark

Radaideh

Kozłowski

Wieselquist

et al. 2019

Science and Technology of Nuclear Installations

View full text Add to dashboard Cite

show abstract

“…According to the dependence of ν p on incident neutron energy is given by linear function below 20 MeV as Function (1), which is fit to the evaluated experimental data. For delayed neutron multiplicity per fission (ν d ), there have some measurements [13][14][15][16][17][18][19][20][21]. According to analysis measurements, V.M.…”

Section: Evaluation Of Nubarmentioning

confidence: 99%

Updated and revised neutron reaction data for²³⁷Np

et al. 2017

View full text Add to dashboard Cite

Abstract. Nuclear data with high accuracy for minor actinides play an important role in nuclear technology applications, including reactor design and operation, fuel cycle, estimation of the amount of minor actinides in high burn-up reactors and the minor actinides transmutation. Based on the evaluated experimental data, the updated and revised evaluation of a full set of n+ 237 Np nuclear data from 10 −5 eV ∼ 20 MeV are carried out and recommended. Mainly revised quantities are neutron multiplicities from fission reaction, inelastic, fission, (n, 2n) and (n, γ ) reaction cross sections as well as angular distribution and so on. The promising results are obtained when the renewal evaluated data of 237 Np will be used to instead of the evaluated data in CENDL-3.1 database.

show abstract

Delayed Neutron Data for Actinides Obtained from Global Level Measurements

Parish

Charlton

1999

Safety Issues Associated With Plutonium Involvement in the Nuclear Fuel Cycle

View full text Add to dashboard Cite

Measurements of Delayed Neutron Decay Constants and Fission Yields from²³⁵U,²³⁷Np,²⁴¹Am, and²⁴³Am

Cited by 21 publications

References 3 publications

Data-Driven and Precursor-Group Uncertainty Propagation of Lattice Kinetic Parameters in UAM Benchmark

Data-Driven and Precursor-Group Uncertainty Propagation of Lattice Kinetic Parameters in UAM Benchmark

Updated and revised neutron reaction data for²³⁷Np

Delayed Neutron Data for Actinides Obtained from Global Level Measurements

Contact Info

Product

Resources

About

Measurements of Delayed Neutron Decay Constants and Fission Yields from235U,237Np,241Am, and243Am

Cited by 21 publications

References 3 publications

Data-Driven and Precursor-Group Uncertainty Propagation of Lattice Kinetic Parameters in UAM Benchmark

Data-Driven and Precursor-Group Uncertainty Propagation of Lattice Kinetic Parameters in UAM Benchmark

Updated and revised neutron reaction data for237Np

Delayed Neutron Data for Actinides Obtained from Global Level Measurements

Contact Info

Product

Resources

About

Measurements of Delayed Neutron Decay Constants and Fission Yields from²³⁵U,²³⁷Np,²⁴¹Am, and²⁴³Am

Updated and revised neutron reaction data for²³⁷Np