Condensation pool

Knowing the time-dependent drop radius R(t), it is possible to estimate the transit time of a droplet and therefore the required distance from the spray nozzle to the condensate pool at the bottom of the condenser in order to size the condenser [178]. 

The pressure-suppression type primary containment is a cylindrical concrete structure with an embedded steel liner type with two major compartments a drywell and wetwell. The lower part of wetwell volume is filled with water that works as the condensation pool, and the upper part is a gas compression chamber. The blow-down pipes from the safety relief valves are routed to the pressure suppression pool. 

The RPV is provided with a pressure relief system which consists of 12 safety (relief) valves connected evenly onto the four steam lines, with blowdown pipes leading down into the condensation pool. The safety (relief) valves are own medium operated valves, each being controlled by two pilot valves, one pressure activated and one electrically controlled this means that actuation can be initiated in a controlled way by pressure monitoring equipment, to avoid over pressurization or to achieve depressurization. In addition, control valves are provided downstream two of the safety valves, in order to enable proper pressure control of the reactor also in the event of isolation (loss of the turbine condenser function). 

Other auxiliary systems serve to cool and clean the water in the condensation pool in the containment wetwell and the water in the reactor service and spent fuel storage pools on top of the containment structure. 

The pressure suppression function is supported by a four train containment spray system that is continuously in service, with one train supplying spray water from the condensation pool to the gas compression chamber in accident situations the system will start operation at full capacity. Spraying is also possible for the upper drywell - after rerouting, on operator action. The drywell spray is generally initiated only in the event of "small" LOG As to "depressurize" the containment. 

Containment support systems Condensation pool cooling and cleanup system, contammoit spray system, containment atmosphere control system, overpressure protection by filtered vent system... 

Design Basis Fission product containment Containment of PS type containment spray condensation pool cooling passive active active The surrounding reactor building serves as a secondary containment, kept at a below-atmospheric pressure, ventilation exhaust air passes through filters... 

Coolant inventory Water losses are made up by coolant injection systems active Water is drawn from condensation pool, pool water can be replenished from outside. 

Steam relief to cond. pool, HP inj. for makeup.] alntermediate heat sink Condensation pool cooling system... 

Coolant mventory (high pressure) - Control rod dnve system - Feedwater system - Isolation condenser pool active active passive 4 ICS loops... 

Unless otherwise agreed upon, the samples are placed at a 15-30 angle from vertical. (Automotive components, however, are often tested in in-car position.) This orientation allows the condensation to run down the specimens and minimize condensation pooling. Overcrowding should be avoided. An important aspect of the test is utilization of a free-falhng mist, which uniformly setdes on the test samples. Samples should be placed in the chamber so that condensation does not drip from one to another. Test durations are typically in 24-h increments and can range from 24-5000 h. (Where salt fog exposure is a part of a more complex test method, exposure time can be as little as 15 min.) Except for sample rotation and daily monitoring of collection rates, the cabinet should remain closed for the duration of the test. 

The quenchers are located in the flooding pool (instead of the condensation pool) at a comparably high elevational position (about 2.5 m below the water level) ... 

The PCC as well as the IC are passively acting components. They are heat exchangers serving to condense steam. The gas flows to the condensers without the use of pumps. It enters into the upper drum and most of the steam is condensed in the vertical tubes. The condenser pool has a ground surface of 1.5 m x 2 m and a height of 5 m. The water level is approx. 4.50 m. 

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