Passive Core Flooding System Hydroaccumulators
Passive core flooding system (PCFS) hydroaccumulators are the most important components of the NPP safety system. They are designed for storing the boric acid water solution and for emergency flooding of the reactor core to remove its residual heat. They are also called second stage ECCS.
Operation of the PCFS hydroaccumulators significantly increases the NPP safety level, and their activation require neither human intervention nor power supply available .
The passive core flooding system hydroaccumulator is a thick-walled vessel designed to store the boric acid water solution. Each accumulator is assembled from shells and bottoms made of high quality stainless steel sheets. In the event of an accident and pressure drop in the primary circuit of the reactor plant, the solution is automatically supplied to the reactor to cool down the reactor core.
The system includes eight hydroaccumulators. As a result of timely removal of residual heat, the reactor plant switches to a safe mode of operation.
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Life time
| 60 years |
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Design temperature
| 235 ℃ |
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Operating temperature
| 20–60 ℃ |
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Design pressure
| 3 MPa |
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Operating pressure
| 0.098 MPa |
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Operating media
| Boric acid solution |
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Mass t
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Diameter m
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Height m
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Internal volume m³
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Housing wall thickness mm
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