Two-phase flow measurement in the upper plenum of a PWR during reflood
In order to study the two-phase hydrodynamics of a pressurized water reactor during emergency reflood, a group of four instruments has been developed for installation at the core and upper plenum interface. These instruments are a drag body, a cut-out portion of the end-box tie plate; a turbine meter located above one of the tie-plate holes; a differential pressure measurement across the tie plate; and a collapsed liquid level measurement above the tie plate. A single-module air and water apparatus simulates the PWR during reflood. Tests are done with the upper plenum empty, and with it containing simulated control rod guide tubes and baffle plates. The flow regimes studied are flooded and unflooded countercurrent flow, upflow, and combined injection. The upper plenum internals have a significant effect on the behavior of the two-phase flow. An algorithm to determine the individual mass flowrates of gas and liquid is presented. This algorithm depends on the drag body force measurement, the differential pressure measurement, the collapsed liquid level, and the flooding line.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Mechanical Engineering
- OSTI ID:
- 5290902
- Report Number(s):
- NUREG/CR-4725; ON: TI86901754
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of two-phase flow at the core/upper plenum interface for a PWR geometry under simulated reflood conditions
Development of in-vessel reflood instrumentation at ORNL. [PWR]
Related Subjects
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ALGORITHMS
CORE SPRAY SYSTEMS
ECCS
ENGINEERED SAFETY SYSTEMS
FLOW RATE
FLOWMETERS
FLUID FLOW
FLUID MECHANICS
HYDRODYNAMICS
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
MECHANICS
METERS
PWR TYPE REACTORS
QUENCHING
REACTOR PROTECTION SYSTEMS
REACTORS
TWO-PHASE FLOW
WATER COOLED REACTORS
WATER MODERATED REACTORS