GB/T 34117-2017 in English

In-depth interpretation of GB/T 34117—2017 Specification for Steam-Water Separator Reheater for Conventional Island Equipment in Nuclear Power Plants

I. Background and significance of standard formulation

As a key auxiliary equipment in a nuclear power plant, the steam-water separator reheater (MSR) is used to effectively separate and reheat the wet steam discharged from the high-pressure cylinder of the steam turbine to ensure that the steam entering the intermediate-pressure cylinder of the steam turbine meets the design parameter requirements. This standard is formulated based on the following background:

• Ensure the safety and reliability of nuclear power plant operation
• Regulate the design, materials and manufacturing process of MSR
• Unify industry technical standards and improve product consistency
• Adapt to the development of nuclear energy technology and the needs of power plant expansion

II. Comparative analysis of standard frameworks

III. Interpretation of core technical requirements

1. Overall design principles

MSR’s design must meet the following requirements:

• Adaptability to all operating conditions: including extreme conditions such as startup conditions, full load operation and load rejection
• Thermal performance optimization: ensuring that the heat transfer terminal difference (TTD) is controlled within a reasonable range
• Compact structure and convenient maintenance

2. Material selection standards

Material requirements for key components:

• Shell: Q345R steel, which must meet the requirements of corrosion resistance and strength
• Heat exchange tube: Ferritic stainless steel, 20MnMo material is recommended
• Steam chamber: Austenitic stainless steel, corrosion resistance must be ensured by matching welding materials

IV. Implementation Suggestions