BC V-213 test facility is a large-scale integral facility modeling the bubble
condenser accident localization system and hermetic compartments of NPP with
VVER-440/V-213 reactor. The volumetric scale of the facility is 1:100. The facility
consists of a bubble condenser model (BC), models of hermetic compartments and water
treatment installation (system of high pressure vessels). The BC model is a full-scale
fragment of NPP bubble condenser containing 18 full-size "gap-cap" elements
positioned in two rows, nine elements in each row. The elevation scale of the BC model is
1:1. Hermetic compartment models of the facility (two steam generator boxes, accident
localization shaft with a full-size fragment of BC, air trap, dead boxes) are scaled
1:100. Outer walls and ceilings of hermetic compartments are designed to withstand the
overpressure of 0.3 MPa and underpressure of 0.02 MPa. The specially designed system of
high pressure vessels allows to simulate steam-water mix leakage from primary and
secondary circuits of the reactor plant under LOCA conditions.
The test facility is equipped with state-of-the-art DAS and
I&C systems. The data acquisition system includes 322 measuring channels with a
sampling frequency of 1000 Hz (dynamic) and 10 Hz (quasistatic). Both standard and
non-standard instruments are used for measurements, including pressure and temperature
transducers, flowmeters, level gages, differential pressure and pressure pulsation
pick-ups, velocity sensors, gages for air concentration in steam-air mix, conductivity and
ultrasonic gages for water level measurements in BC. For visualization of water swelling
process in BC trays and operation of check and relief valves, video recording is used with
the following computer processing of the picture. The purpose of BC V-213 test facility is:
conducting thermal-hydraulic tests to study operability and reliability of bubble
condenser accident localization system at NPP with VVER-440/V-213 under design basis
accidents, small break LOCAs and accidents caused by the secondary steam line breaks.
Specific features of the test facility structure allow its utilizing for the experimental
studies as follows:
- simulation of accidents caused by single failures of BC accident localization system equipment;
- assessment of the pressurized volume air-tightness, experimental justification of verification procedures for results of the pressurized volume integral testing;
- study of structural integrity problems;
- testing of safety valves of steam generator box at NPPs with VVER-440/V-213;
- modeling of BC operation under beyond the design basis accident conditions;
- study of hydrodynamic effects on equipment under pipeline break accidents.
Modeling scale for hermetic compartment volumes and coolant flow rates - 1:100
Number of hermetic compartments - 5
Number of high pressure vessels - 5
Total volume of hermetic compartments - 520 m3
Volume of pressure vessels - 7 m3
Maximum coolant operating pressure - 12.5 MPa
Maximum coolant operating temperature - 327.5 °C
Maximum pressure in hermetic compartments - 0.3 MPa
The work to be performed at BC V-213 test facility within the year 2001:
In 2001, under the contract with Pilot Design Bureau "Gidropress", the test facility has been used for experimental study of coolant streams hydrodynamic effect on NPP equipment at high pressure pipeline breaks. After the completion of this work, the qualification of Kola NPP bubble condenser accident localization system will be performed at the test facility within the project TACIS R2.01/99.
The results:
In 1999, an experimental programme for modeling the BC accident localization system under DBA conditions (guillotine rupture of the primary circuit cold leg) for VVER-440/V-213 reactor was implemented within the international TACIS/PHARE project No. PH 2.13/95 "Bubble Condenser Experimental Qualification".