Thermosyphoning in the HTS is supported by provision of feedwater to the secondary side of the steam generators for heat removal. There are several feedwater options available in ACR-1000. The main feedwater system (using either the main or start-up feedwater pumps) and the four-quadrant EFW system are capable of supplying feedwater to the SGs at full pressure. If these active sources are not available, passive design feature of supply is provided by gravity from the RWS (see Fig. II-3) after auto-depressurization of the SGs.
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