Category Archives: ANNEX III. AHWR. Bhabha Atomic Research Centre, India

Description of quick boron supply system

The quick boron supply system (QBSS), being developed as an additional reactor trip system, comprises a system of 4 special loops bypassing the main coolant pumps. Each loop consists of a hydroaccumulator containing concentrated boron acid solution and pipelines with quick-acting valves that do not require electric power for their opening. These valves are opened when the reactor fails to […]

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Description of stand-alone direct heat removal system (SDHS)

IMR realizes ‘no cause of fuel failure’ concept by reactor design and the core is always submerged in primary coolant without safety injection. Therefore, only a heat removal function is required as the safety system. Figure XV-2 shows the configuration of the stand-alone direct heat removal system (SDHS). SDHS is a closed natural circulation system that removes residual heat directly […]

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Passive residual heat removal (PRHR) system

The passive residual heat removal (PRHR) consists of a C-Tube type heat exchanger that resides in the water-filled In-containment refueling water storage tank (IRWST) as shown in the schematic given in Figure V-4. The PRHR provides primary coolant heat removal via a natural circulation loop. Hot water rises through the PRHR inlet line attached to one of the hot legs. […]

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Description of the containment cooling condenser

The flooding pools are equipped with active coolers. If the active cooling fails, the 3600 m3 pool will not start to evaporate for twelve hours. During a failure the pressure in the containment is increased and the heat is transferred by four containment cooling condensers into the upper shielding pool (see Fig. XI-1, XI-2 and XI-4). Each condenser is able […]

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Description of natural circulation core cooling system

The core is cooled mostly by the single-phase free convection due to natural circulation. The natural circulation loop consists of the core, the chimney, the downcomer and the lower plenum. In order to establish natural circulation at different RPV liquid levels during normal operations and accidents, the core barrel has large communication-holes above the SG top elevation and small holes […]

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