The magnitude and reactivity consequences of accidental moisture ingress into the MHTGR core
Accidental admission of moisture into the primary system of a Modular High Temperature Gas-cooled Reactor (MHTGR) has been identified as an important safety concern. The work described here develops an analytical methodology to quantify the pressure and reactivity consequences of steam generator tube rupture and other moisture-related incidents. Important neutronic and thermohydraulic processes are coupled with reactivity feedback and controls response. Steam ingress rate and magnitude are found to be dominated by major system features such as break size in comparison with safety valve capacity and reliability, while being less sensitive to factors such as heat transfer coefficients. The results indicate that ingress transients may progress at a slower pace than previously predicted, with milder power overshoots and more time for the operator to take corrective actions.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5629072
- Report Number(s):
- CONF-920538-2; ON: DE92009007
- Resource Relation:
- Conference: 8. power plant dynamics, control and testing symposium, Knoxville, TN (United States), 27-29 May 1992
- Country of Publication:
- United States
- Language:
- English
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Magnitude and reactivity consequences of accidental moisture ingress into the Modular High-Temperature Gas-Cooled Reactor core
Magnitude and reactivity consequences of moisture ingress into the modular High-Temperature Gas-Cooled Reactor core
Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
HTGR TYPE REACTORS
PRIMARY COOLANT CIRCUITS
STEAM GENERATORS
TUBES
RUPTURES
HEAT TRANSFER
HYDRAULICS
MOISTURE
REACTIVITY
REACTOR CONTROL SYSTEMS
REACTOR SAFETY
STEAM
BOILERS
CONTROL SYSTEMS
COOLING SYSTEMS
ENERGY TRANSFER
FAILURES
FLUID MECHANICS
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
MECHANICS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
SAFETY
VAPOR GENERATORS
220900* - Nuclear Reactor Technology- Reactor Safety
220400 - Nuclear Reactor Technology- Control Systems
210300 - Power Reactors
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