Author: George Robert KeepinPublisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 58
Book Description
Delayed Neutrons from Fissionable Isotopes of Uranium, Plutonium, and Thorium
Author: George Robert KeepinPublisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 58
Book Description
Delayed Neutron Data
Author: T. Derek BeynonENDF/B-VI Six-group Delayed Neutron Data
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
This paper evaluates ENDF/B-VI delayed neutron data for 235U, 238U, and 239Pu. (LSP).
Evaluation and Application of Delayed Neutron Precursor Data
Author: Michaele Clarice BradyPublisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 564
Book Description
Delayed Neutrons
Author: George Robert KeepinPublisher:
ISBN:
Category : Delayed neutrons
Languages : en
Pages : 56
Book Description
A comprehensive review is given of existing measurements as of October 1955 on the properties of delayed neutrons from various fissionable isotopes. The relation of these measurements to current theory and practice is discussed.
An Improved Delayed Neutron Fission Product Monitor
Author: James D. HeckelmanProceedings of the specialists' meeting on Delayed Neutron Nuclear data
Author: Ed.: Jun-ichi KatakuraNew Evaluation of Delayed-neutron Data and Associated Covariances
Author: Daniela FolignoPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
In the context of nuclear reactor physics, one of the main issues is the control of the chain reaction. After a fission event has occurred, around three prompt neutrons are immediately emitted. Luckily, a small fraction of neutrons - less than 1% - appears with a certain delay with respect to the fission event. Delayed neutrons (DN) are an easy way out from the uncontrollable prompt-neutron driven chain reaction because they slow down the response of the reactor to a change in reactivity. Quantifying the fraction of such neutrons as well as their kinetic behavior is essential to design a safe reactor. The main consequence of a lack of accurate DN data is the conservatism in the design of a reactor. Nowadays, the discrepancy between the reactivity simulated using different international databases, rises up to 16% for LWRs, and the uncertainties associated with the recommended parameters are still too large for the needs of the industry. The DN parameters are generally estimated through a calculation or an integral measurement. This Ph.D. aims at producing a new set of DN parameters by performing both calculations and measurements, and by exploiting the two through the Bayesian inference, with the aim of reducing the uncertainties and creating the associated covariance matrices.The results for 235U, together with the calculated values for 238U, have been tested in three benchmarks, giving satisfying solutions with respect to the effective delayed neutron fraction. The main achievement of this work is the great improvement in the predicted reactivity, especially for negative periods, which is accompanied by an extremely good precision, never exceeding 2.2%.
Beta-delayed Neutron Data and Models for SCALE
Author: Kemper Dyar TalleyPublisher:
ISBN:
Category : Beta decay
Languages : en
Pages : 116
Book Description
Delayed Neutron Data
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
BS>The status of delayed neutron measurements is reviewed. Emphasis is placed on the absolute yield va the energy of the neutrons cauging fission, group yields and periods, and in the delayed neutron spectra. Systematics are discussed; and an evaluated data set, based both on available measurements and on systematics arguments, is suggested for inclusion in ENDF/B-IV. Areas of delayed neutron studies which require additional measurements are outlined. (18 figures, 18 tables) (auth).