Magnitude and reactivity consequences of accidental moisture ingress into the Modular High-Temperature Gas-Cooled Reactor core
Accidental admission of moisture into the primary system of a Modular High-Temperature Gas-Cooled Reactor (MHTGR) has been identified in US Department of Energy-sponsored studies 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 moistureingress-related incidents. Important neutronic and thermohydraulic processes are coupled with reactivity feedback and safety and control system responses. Rate and magnitude of steam buildup 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 progress at a slower pace than previously predicted by bounding analyses, with milder power overshoots and more time for operator or automatic corrective actions.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USNRC; Nuclear Regulatory Commission, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6989623
- Report Number(s):
- CONF-921007-2; ON: DE93002426; TRN: 92-038327
- Resource Relation:
- Conference: 20. water reactor safety information meeting, Bethesda, MD (United States), 21-23 Oct 1992
- Country of Publication:
- United States
- Language:
- English
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The magnitude and reactivity consequences of accidental moisture ingress into the MHTGR 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
REACTIVITY
MOISTURE
REACTOR SAFETY
RUPTURES
STEAM GENERATORS
THERMODYNAMICS
TRANSIENTS
TUBES
BOILERS
FAILURES
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
REACTORS
SAFETY
VAPOR GENERATORS
220900* - Nuclear Reactor Technology- Reactor Safety
210300 - Power Reactors
Nonbreeding
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