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Book SENSITIVITY AND UNCERTAINTY ANALYSES APPLIED TO CRITICALITY SAFETY VALIDATION ILLUSTRATIVE APPLICATIONS AND NUREG

Download or read book SENSITIVITY AND UNCERTAINTY ANALYSES APPLIED TO CRITICALITY SAFETY VALIDATION ILLUSTRATIVE APPLICATIONS AND NUREG written by U.S. Nuclear Regulatory Commission and published by . This book was released on 2000* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Sensitivity Uncertainty Based Nuclear Criticality Safety Validation

Download or read book Sensitivity Uncertainty Based Nuclear Criticality Safety Validation written by and published by . This book was released on 2016 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: These are slides from a seminar given to the University of Mexico Nuclear Engineering Department. Whisper is a statistical analysis package developed to support nuclear criticality safety validation. It uses the sensitivity profile data for an application as computed by MCNP6 along with covariance files for the nuclear data to determine a baseline upper-subcritical-limit for the application. Whisper and its associated benchmark files are developed and maintained as part of MCNP6, and will be distributed with all future releases of MCNP6. Although sensitivity-uncertainty methods for NCS validation have been under development for 20 years, continuous-energy Monte Carlo codes such as MCNP could not determine the required adjoint-weighted tallies for sensitivity profiles. The recent introduction of the iterated fission probability method into MCNP led to the rapid development of sensitivity analysis capabilities for MCNP6 and the development of Whisper. Sensitivity-uncertainty based methods represent the future for NCS validation - making full use of today's computer power to codify past approaches based largely on expert judgment. Validation results are defensible, auditable, and repeatable as needed with different assumptions and process models. The new methods can supplement, support, and extend traditional validation approaches.

Book Sensitivity and Uncertainty Analysis for Nuclear Criticality Safety Using KENO in the SCALE Code System

Download or read book Sensitivity and Uncertainty Analysis for Nuclear Criticality Safety Using KENO in the SCALE Code System written by and published by . This book was released on 2000 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sensitivity and uncertainty methods have been developed to aid in the establishment of areas of applicability and validation of computer codes and nuclear data for nuclear criticality safety studies. A key component in this work is the generation of sensitivity and uncertainty parameters for typically several hundred benchmarks experiments used in validation exercises. Previously, only one-dimensional sensitivity tools were available for this task, which necessitated the remodeling of multidimensional inputs in order for such an analysis to be performed. This paper describes the development of the SEN3 Monte Carlo based sensitivity analysis sequence for SCALE. Two options in the SEN3 package for the reconstruction of angular-dependent forward and adjoint fluxes are described and contrasted. These options are the direct calculation of flux moments versus the calculation of angular fluxes, with subsequent conversion to flux moments prior to sensitivity coefficient generation. The latter technique is found to be significantly more efficient.

Book Lecture Notes on Sensitivity Uncertainty Based Nuclear Criticality Safety Validation

Download or read book Lecture Notes on Sensitivity Uncertainty Based Nuclear Criticality Safety Validation written by and published by . This book was released on 2016 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document is a collection of lecture notes for sensitivity-uncertainty analysis and nuclear safety validation approaches.

Book Computational Methods for Sensitivity and Uncertainty Analysis in Criticality Safety

Download or read book Computational Methods for Sensitivity and Uncertainty Analysis in Criticality Safety written by and published by . This book was released on 1999 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in the sensitivity methods that were developed and widely used in the 1970s (the FORSS methodology at ORNL among others) has increased recently as a result of potential use in the area of criticality safety data validation procedures to define computational bias, uncertainties and area(s) of applicability. Functional forms of the resulting sensitivity coefficients can be used as formal parameters in the determination of applicability of benchmark experiments to their corresponding industrial application areas. In order for these techniques to be generally useful to the criticality safety practitioner, the procedures governing their use had to be updated and simplified. This paper will describe the resulting sensitivity analysis tools that have been generated for potential use by the criticality safety community.

Book Transactions of the American Nuclear Society

Download or read book Transactions of the American Nuclear Society written by American Nuclear Society and published by . This book was released on 2000 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Practices and Developments in Spent Fuel Burnup Credit Applications

Download or read book Practices and Developments in Spent Fuel Burnup Credit Applications written by and published by . This book was released on 2003 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Documents the proceedings of the IAEA's third major BUC meeting in Madrid in April 2002 on requirements, practices and developments in BUC applications. Fifty-four participants from 18 countries addressed validation of codes and methods, key issues, safety assessment and implementation, and future applications.

Book PROBABILISTIC ACCIDENT CONSEQUENCE UNCERTAINTY ANALYSIS NUREG CR 6526 VOL 1 U S NUCLEAR REGULATORY COMMISSION

Download or read book PROBABILISTIC ACCIDENT CONSEQUENCE UNCERTAINTY ANALYSIS NUREG CR 6526 VOL 1 U S NUCLEAR REGULATORY COMMISSION written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1998* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Development of a Generalized Perturbation Theory Method for Sensitivity Analysis Using Continuous energy Monte Carlo Methods

Download or read book Development of a Generalized Perturbation Theory Method for Sensitivity Analysis Using Continuous energy Monte Carlo Methods written by and published by . This book was released on 2016 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sensitivity and uncertainty analysis tools of the ORNL SCALE nuclear modeling and simulation code system that have been developed over the last decade have proven indispensable for numerous application and design studies for nuclear criticality safety and reactor physics. SCALE contains tools for analyzing the uncertainty in the eigenvalue of critical systems, but cannot quantify uncertainty in important neutronic parameters such as multigroup cross sections, fuel fission rates, activation rates, and neutron fluence rates with realistic three-dimensional Monte Carlo simulations. A more complete understanding of the sources of uncertainty in these design-limiting parameters could lead to improvements in process optimization, reactor safety, and help inform regulators when setting operational safety margins. A novel approach for calculating eigenvalue sensitivity coefficients, known as the CLUTCH method, was recently explored as academic research and has been found to accurately and rapidly calculate sensitivity coefficients in criticality safety applications. The work presented here describes a new method, known as the GEAR-MC method, which extends the CLUTCH theory for calculating eigenvalue sensitivity coefficients to enable sensitivity coefficient calculations and uncertainty analysis for a generalized set of neutronic responses using high-fidelity continuous-energy Monte Carlo calculations. Here, several criticality safety systems were examined to demonstrate proof of principle for the GEAR-MC method, and GEAR-MC was seen to produce response sensitivity coefficients that agreed well with reference direct perturbation sensitivity coefficients.

Book New Nuclear Data

Download or read book New Nuclear Data written by and published by . This book was released on 1957 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Nuclear Regulatory Commission Issuances

Download or read book Nuclear Regulatory Commission Issuances written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1979 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Energy Electricity and Nuclear Power Estimates for the Period Up to 2020

Download or read book Energy Electricity and Nuclear Power Estimates for the Period Up to 2020 written by International Atomic Energy Agency and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the twentieth edition of Reference Data Series No. 1, containing the most recent estimates of energy, electricity and nuclear power trends up to the year 2020. Nuclear data are based on actual statistical data collected by the IAEA's Power Reactor Information System (PRIS). Energy, electricity and population data for 1999 are estimates based on information from the Department of Economic and Social Affairs of the United Nations.