Offline determination system and method for content of dissolved hydrogen in pressurized water reactor primary loop coolant

Abstract

The invention discloses an offline determination system for the content of dissolved hydrogen in a pressurized water reactor primary loop coolant. The system comprises a primary loop sampling system,an outlet valve and an inlet valve of the primary loop sampling system, an offline hydrogen meter positioned at the downstream of the outlet valve of the primary loop sampling system, and a back pressure valve positioned at the downstream of the offline hydrogen meter. A downstream outlet of the back pressure valve is communicated with the inlet valve of the primary loop sampling system. The outlet valve of the primary loop sampling system, the offline hydrogen meter, the back pressure valve and the inlet valve of the primary loop sampling system are sequentially and quickly connected throughtransparent pe pipes. According to the offline determination method for the content of dissolved hydrogen in the pressurized water reactor primary loop coolant, when the concentration of dissolved hydrogen in a primary loop sampling system is greater than 18.2 cc / Kg, the saturated dissolved hydrogen content of water is increased by increasing the pressure of the system, so that the content of dissolved hydrogen in the primary loop sampling system can be movably measured anytime and anywhere.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant pressurized water reactors, in particular to an off-line measurement system and method for the dissolved hydrogen content in the primary circuit coolant of the pressurized water reactor. Background technique [0002] There are hundreds of nuclear power units in operation around the world, of which the vast majority (about 92%) are light water reactors (LWR), and the rest are heavy water reactors (PHWR) and advanced gas-cooled reactors (AGR). There are mainly two types of light water reactors: pressurized water reactor (PWR) and boiling water reactor (BWR), of which about 75% are pressurized water reactors. Water reactor nuclear power plants use light water as a coolant and moderator. It is mainly composed of nuclear steam supply system (i.e. primary circuit system), turbo generator system (i.e. secondary circuit system) and other auxiliary systems. After the coolant absorbs the heat ...

AI Technical Summary

Problems solved by technology

However, under standard atmospheric pressure, the saturated volume of hydrogen absorbed by water at 20°C is 18.2cc / kg. When the dissolved hydrogen concentration in the coolant exceeds 18.2cc / kg, it will exceed the saturated volume of hydrogen absorbed by water, resulting in inaccurate offline hydrogen meters. Measuring the dissolved hydrogen concentration in the primary loop sampling system

Therefore, a measurement method is needed to solve the problem that the off-line hydrogen meter cannot measure accurately when the dissolved hydrogen concentration in the primary circuit of the PWR nuclear power plant is greater than 18.2cc / Kg

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