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BWR Anticipated Transients Without Scram Leading to Instability

Description: Anticipated transients without scram (ATWS) in aboiling water reactor (BWR) were simulated in order to understand reactor response and determine the effectiveness of automatic and operator actions to mitigate this beyond-design-basis accident. The events of interest herein are initiated by a turbine trip when the reactor is operating in the expanded operating domainMELLLA+ [maximum extended load line limit plus]. In these events the reactor may initially be at up to 120% of the original license… more
Date: November 10, 2013
Creator: Cheng, Lap-Yan; Baek, Joo-Seok; Cuadra, Arantxa; Aronson, Arnold; Diamond, David & Yarsky, Peter
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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TRACE Model for Simulation of Anticipated Transients Without Scram in a BWR

Description: A TRACE model has been developed for using theTRACE/PARCS computational package [1, 2] to simulate anticipated transients without scram (ATWS) events in a boiling water reactor (BWR). The model represents a BWR/5 housed in a Mark II containment. The reactor and the balance of plant systems are modeled in sufficient detail to enable the evaluation of plant responses and theeffectiveness of automatic and operator actions tomitigate this beyond design basis accident.The TRACE model implements feat… more
Date: November 10, 2013
Creator: Cheng, Lap-Yan; Baek,Joo-Seok; Cuadra,Arantxa; Aronson, Arnold; Diamond, David & Yarsky, Peter
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

TRACE/PARCS Core Modeling of a BWR/5 for Accident Analysis of ATWS Events

Description: The TRACE/PARCS computational package [1, 2] isdesigned to be applicable to the analysis of light water reactor operational transients and accidents where the coupling between the neutron kinetics (PARCS) and the thermal-hydraulics and thermal-mechanics (TRACE) is important. TRACE/PARCS has been assessed for itsapplicability to anticipated transients without scram(ATWS) [3]. The challenge, addressed in this study, is to develop a sufficiently rigorous input model that would be acceptable for us… more
Date: November 10, 2013
Creator: Cuadra, Arantxa; Baek,Joo-Seok; Cheng, Lap-Yan; Aronson, Arnold; Diamond, David & Yarsky, Peter
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Seismic Soil-Structure Interaction Analyses of a Deeply Embedded Model Reactor – SASSI Analyses

Description: This report summarizes the SASSI analyses of a deeply embedded reactor model performed by BNL and CJC and Associates, as part of the seismic soil-structure interaction (SSI) simulation capability project for the NEAMS (Nuclear Energy Advanced Modeling and Simulation) Program of the Department of Energy. The SASSI analyses included three cases: 0.2 g, 0.5 g, and 0.9g, all of which refer to nominal peak accelerations at the top of the bedrock. The analyses utilized the modified subtraction method… more
Date: October 31, 2013
Creator: J., Nie; J., Braverman & Costantino, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Transition Core Properties during Conversion of the NBSR from HEU to LEU Fuel

Description: The transition of the NBSR from HEU to LEU fuel is challenging due to reactivity constraints and the need to maintain an uninterrupted science program, the mission of the NBSR. The transition cannot occur with a full change of HEU to LEU fuel elements since the excess reactivity would be large enough that the NBSR would violate the technical specification for shutdown margin. Manufacturing LEU fuel elements to represent irradiated fuel elements would be cost prohibitive since 26 one-of-a-kind f… more
Date: October 31, 2013
Creator: L., Hanson A. & D., Diamond
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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