User Manual for Whisper-1.1

Brown, Forrest B.; Rising, Michael Evan; Alwin, Jennifer Louise

doi:10.2172/1341834

Cited by 10 publications

(10 citation statements)

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“…54 The Whisper code is used for sensitivity-uncertainty-based nuclear criticality safety validation. 78,79 MCNPTools is a collection of commonly used utilities that perform functions such as merging files from different calculations. 80 The true power behind MCNPTools is that it allows the user to write their own custom tools and process MCNP® code output.…”

Section: Ivd Los Alamos Monte Carlo Code Development Historymentioning

confidence: 99%

Neutronics Calculation Advances at Los Alamos: Manhattan Project to Monte Carlo

et al. 2021

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The history and advances of neutronics calculations at Los Alamos during the Manhattan Project through the present is reviewed. We briefly summarize early simpler, and more approximate neutronics methods. We then motivate the need to better predict neutronics behavior through consideration of theoretical equations, models and algorithms, experimental measurements, and available computing capabilities and their limitations. These, coupled with increasing post-war defense needs, and the invention of electronic computing led to the creation of Monte Carlo neutronics transport. As a part of the history, we note the crucial role that the scientific comradery between the great Los Alamos scientists played in the process. We focus heavily on these early developments and the subsequent successes of Monte Carlo and its applications to problems of national defense at Los Alamos. We cover the early methods, algorithms, and computers, electronic and women pioneers, that enabled Monte Carlo to spread to all areas of science.

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Section: Ivd Los Alamos Monte Carlo Code Development Historymentioning

confidence: 99%

Neutronics Calculation Advances at Los Alamos: Manhattan Project to Monte Carlo

et al. 2021

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“…A summary of changes made in going from whisper-1.0 to whisper-1.1 includes: [9], continuousenergy Monte Carlo codes such as MCNP could not determine adjoint-weighted tallies for sensitivity profiles. The introduction of the iterated fission probability method (IFP) into MCNP [10] led to the rapid development of sensitivity analysis capabilities for MCNP6 and the development of Whisper in 2014.…”

Section: Change History For Whisper-11mentioning

confidence: 99%

“…Whisper version 1.0 was first developed and used at LANL in 2014 [3]. During 2015-2016, Whisper was updated to version 1.1 [9] and is to be included with the upcoming release of MCNP6.2.…”

Section: Introduction and Overviewmentioning

confidence: 99%

Release Notes for Whisper-1.1

Brown¹,

Rising²,

Alwin³

2017

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“…In this paper, the sensitivity and uncertainty (S\U) analyses on the first core criticality of the Indonesian Multipurpose Research Reactor RSG GAS are evaluated using the modern nuclear data libraries such as ENDF/B-VII.1 [6] and JENDL-4.0 [7] using Whisper-1.1 [8] within MCNP6.2 software distribution.…”

Section: Introductionmentioning

confidence: 99%

Nuclear data sensitivity and uncertainty analyses on the first core criticality of the RSG GAS multipurpose research reactor

Liem¹,

Zuhair²,

Hartanto³

2020

EPJ Web Conf.

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The results of criticality, sensitivity and uncertainty (S\U) analyses on the first core criticality of the Indonesian 30 MWth Multipurpose Reactor RSG GAS (MPR-30) using the recent nuclear data libraries (ENDF/B-VII.1 and JENDL-4.0) and analytical tools available at present (WHISPER-1.1) are presented. Two groups of criticality benchmark cases were carefully selected from the experiments conducted during the first criticality approach and control rod calibrations. The C/E values of effective neutron multiplication factor (k) for the worst case was found around 1.005. Large negative sensitivities were found in (n,e-mail:γ) reaction of H-1, U-235, Al-27, U-238 and Be-9 while large positive sensitivities were found in U-235 (total nu and fission), H-1 (elastic), Be-9 (free gas, elastic) and H-1 S(α,β) (lwtr.20t, inelastic). The S\U analysis results concluded that the uncertainties of k originated from the nuclear data were found around 0.6% which covered well the [C/E-1] values. Differences in the sensitivities amongst the two nuclear data libraries were also identified, and recommendation for improving the nuclear data library was given.

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User Manual for Whisper-1.1

Cited by 10 publications

References 0 publications

Neutronics Calculation Advances at Los Alamos: Manhattan Project to Monte Carlo

Neutronics Calculation Advances at Los Alamos: Manhattan Project to Monte Carlo

Release Notes for Whisper-1.1

Nuclear data sensitivity and uncertainty analyses on the first core criticality of the RSG GAS multipurpose research reactor

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