Hydrogenation system for a pressurized water reactor

A method of operating a pressurized water reactor, the pressurized water reactor comprising a primary reactor coolant circuit flown through by a primary reactor coolant during operation,

• the pressurized water reactor comprising
• a chemical and volume control system for the primary reactor coolant, the chemical and volume control system comprising, along the direction of flow of the primary reactor coolant,
• a letdown line,
• a pressure charging pump with a given discharge pressure, and
• a charging line leading to primary reactor coolant circuit,
• the chemical and volume control system further comprising
• a hydrogenation system with a hydrogen supply and a hydrogen feeding line,
• a pressure feeding pump being arranged in the hydrogen feeding line to provide a gas pressure higher than the discharge pressure of the pressure charging pump,
• the hydrogen feeding line discharging into the charging line, a heat exchanger, configured to be flown through by a heating medium,
• is arranged in the charging line to increase the temperature of the primary reactor coolant before injection into the primary reactor coolant circuit, a connection between the hydrogen feeding line and the charging line being located in a section of the charging line between the charging pump and the heat exchanger,
• the method comprising:
• pressurizing hydrogen in the hydrogen feeding line to a pressure higher than the discharge pressure of the charging pump;
• and then injecting the pressurized hydrogen into the primary reactor coolant via the charging line.