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Title: FlowSim/FlowRisk: A code system for studying risk associated with material process flows

Abstract

The need to study and assess life-cycle risks of Pu release by nuclear warheads during peace time lead to the development of a code suite which could model day to day operations involving nuclear weapons and calculate the associated risk involved in these proceedings. The life-cycle study called LIONSHARE is described in Reference 1. The code that models the flow is called FlowSim. The code that evaluates the associated risk is called FlowRisk. We shall concentrate here on the methodology used by FlowSim in modeling material flows. FlowRisk, mainly a postprocessor of FlowSim runs, will be dealt with in less detail.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10191112
Report Number(s):
UCRL-JC-115270; CONF-9303221-3
ON: DE94001766
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Probabilistic safety assessment and management (PSAM) conference,San Diego, CA (United States),20-24 Mar 1993; Other Information: PBD: Oct 1993
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; NUCLEAR MATERIALS MANAGEMENT; F CODES; NUCLEAR EXPLOSIVES; PLUTONIUM; LIFE-CYCLE COST; NUCLEAR WEAPONS; RISK ASSESSMENT; ACCOUNTING; MATERIAL BALANCE; 450200; 055000; 990200; NUCLEAR EXPLOSIONS AND EXPLOSIVES; SAFEGUARDS, INSPECTION, AND ACCOUNTABILITY; MATHEMATICS AND COMPUTERS

Citation Formats

Kaufman, A.M. FlowSim/FlowRisk: A code system for studying risk associated with material process flows. United States: N. p., 1993. Web.
Kaufman, A.M. FlowSim/FlowRisk: A code system for studying risk associated with material process flows. United States.
Kaufman, A.M. Fri . "FlowSim/FlowRisk: A code system for studying risk associated with material process flows". United States. doi:. https://www.osti.gov/servlets/purl/10191112.
@article{osti_10191112,
title = {FlowSim/FlowRisk: A code system for studying risk associated with material process flows},
author = {Kaufman, A.M.},
abstractNote = {The need to study and assess life-cycle risks of Pu release by nuclear warheads during peace time lead to the development of a code suite which could model day to day operations involving nuclear weapons and calculate the associated risk involved in these proceedings. The life-cycle study called LIONSHARE is described in Reference 1. The code that models the flow is called FlowSim. The code that evaluates the associated risk is called FlowRisk. We shall concentrate here on the methodology used by FlowSim in modeling material flows. FlowRisk, mainly a postprocessor of FlowSim runs, will be dealt with in less detail.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Oct 01 00:00:00 EDT 1993},
month = {Fri Oct 01 00:00:00 EDT 1993}
}

Conference:
Other availability
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  • The need to study and assess life-cycle risks of Pu release by nuclear warheads during peace time lead to the development of a code which could model day to day operations involving nuclear weapons and calculate the associated risk involved in these proceedings. The code which accomplishes this risk assessment is called FlowSim. FlowSim is an event driven simulation implemented with the Mathematics computer language. FlowSim uses the paradigm of material flows and processes operating on the material in the flow. The Mathematica programming language, which is especially designed for dealing with symbolic entities, is used to enter the descriptionsmore » of both flows and processes at run time. Risk rate is calculated at the conclusion of each process and flow. Thus, both risk rate and integrated risk are available as outputs for the analyst.« less
  • The need to study and assess life-cycle risks of Pu release by nuclear warheads during peace time lead to the development of a code which could model day to day operations involving nuclear weapons and calculate the associated risk involved in these proceedings. The code which accomplishes this risk assessment is called FlowSim. FlowSim is an event driven simulation implemented with the Mathematics computer language. FlowSim uses the paradigm of material flows and processes operating on the material in the flow. The Mathematica programming language, which is especially designed for dealing with symbolic entities, is used to enter the descriptionsmore » of both flows and processes at run time. Risk rate is calculated at the conclusion of each process and flow. Thus, both risk rate and integrated risk are available as outputs for the analyst.« less
  • Possible improvements in biomass ethanol production are described involving heat-pumped distillation, steam-cycle heat integration, elimination of seed fermenters, pretreatment heat integration, advanced pretreatment, thermophilic DMC, and increased carbohydrate yield to 90% of theoretical. Relative to the current state-of-the-art National Renewable Energy Laboratory process design, the futuristic process has 101% higher electricity revenue, 31% higher ethanol revenue, and 35-39% higher overall revenue depending on the assumed ethanol value. The overall first-law thermodynamic efficiency is 43% for the current NREL design and 59% for the futuristic process. A general consideration of the costs associated with the process improvements examined indicates that: (1)more » Elimination of seed reactors, advanced pretreatment, and thermophilic DMC all have large potential cost reductions independent of their benefits with respect to increased surplus electricity; (2) Steam cycle improvements and pretreatment heat integration are expected to have modest cost benefits that are dependent on increased electricity revenues; and (3) The relative cost of heat-pumped distillation depends on scale, capital recovery, and electricity value, but is generally similar to the already low cost of conventional distillation provided that the fermentation broth has a reasonably high ethanol concentration. A comparison of utilizing biomass for ethanol-electricity coproduction and utilizing biomass for dedicated electricity production indicates that these two alternatives have approximately equal economic benefits. At the electricity yields associated with the futuristic process, every 1% displacement of US transportation demand is accompanied by a 0.29% displacement of electricity demand, underscoring the potential significance of electricity coproduced with ethanol in meeting energy needs.« less
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