ECCS accumulator performance in scaled PWR experiments
Conference
·
OSTI ID:6609475
Best-estimate models for pressurized water reactor (PWR) loss-of-coolant (LOCA) analysis require a realistic assessment of the thermodynamic behavior of the N/sub 2/ gas in the accumulators of an emergency core cooling system (ECCS). The LOFT and Semiscale reactor safety research facilities, which are scaled to a commercial PWR, have provided experimental information which identifies the thermodynamic behavior of scaled ECCS accumulators. The thermodynamic behavior of PWR accumulators can be identified from the experimental results through the scaling rationale. ECCS accumulators are large tanks partially filled and pressurized with N/sub 2/. The accumulators are isolated from the primary system piping by two check valves. Reduction in system pressure due to a pipe break causes the check valves to open and accumulator flow to begin. The thermodynamic behavior of the N/sub 2/ gas in the accumulator can be characterized quite simply by a polytropic gas constant. RELAP4 calculations on the LOFT system show typical differences of about 15% in accumulator flow rates between polytropic gas constants of 1.0 (isothermal) and 1.4 (isentropic) where the isentropic case corresponds to the lower flow rate.
- Research Organization:
- EG and G Idaho, Inc., Idaho Falls (USA)
- DOE Contract Number:
- EY-76-C-07-1570
- OSTI ID:
- 6609475
- Report Number(s):
- CONF-781105-7
- Country of Publication:
- United States
- Language:
- English
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ECC delivery and distribution in scaled PWR experiments
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ACCUMULATORS
CONTAINERS
ECCS
ENGINEERED SAFETY SYSTEMS
FLUID FLOW
LOSS OF COOLANT
MOCKUP
PERFORMANCE
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTOR PROTECTION SYSTEMS
REACTORS
SIMULATION
STRUCTURAL MODELS
TANKS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ACCUMULATORS
CONTAINERS
ECCS
ENGINEERED SAFETY SYSTEMS
FLUID FLOW
LOSS OF COOLANT
MOCKUP
PERFORMANCE
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTOR PROTECTION SYSTEMS
REACTORS
SIMULATION
STRUCTURAL MODELS
TANKS
WATER COOLED REACTORS
WATER MODERATED REACTORS