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Title: BWR Anticipated Transients Without Scram Leading to Instability

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 licensed thermal power (OLTP) and at flow rates as low as 80% of rated.For these (and similar) ATWS events the concern isthat when the reactor power decreases in response to a dual recirculation pump trip, the core will become unstable and large amplitude oscillations will begin. The occurrence of these power oscillations, if left unmitigated, may result in fuel damage, and the amplitude of the poweroscillations may hamper the effectiveness of the injection of dissolved neutron absorber through the standby liquid control system (SLCS).
Authors:
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Publication Date:
OSTI Identifier:
1091775
Report Number(s):
BNL--101129-2013-CP
R&D Project: 15451/15830; 401001060
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 2013 ANS Winter Meeting and Nuclear Technology Expo; Washington, D.C; 20131110 through 20131114
Research Org:
Brookhaven National Laboratory (BNL)
Sponsoring Org:
AMERICAN NUCLEAR SOCIETY
Country of Publication:
United States
Language:
English
Subject:
42 ATWS; BWR; TRACE/PARCS; SLCS