GB/T 42545-2023 in English

This standard establishes the full life cycle management system of the rubber lining equipment of nuclear power plants for the first time, and explicitly requires that the service life of CP1-level key equipment be ≥20 years, and that the anti-corrosion goal be achieved through the three-dimensional coordinated control of materials-processes-testing. Appendix B stipulates that the bonding strength of hard rubber linings must be ≥6MPa, and that of soft rubber linings must be ≥3.5kN/m.

Technical Specifications for Material Selection

Typical application case: CPR1000 unit SEC system adopts class=instrument>EPDM rubber lining, through 168 hours 5% NaClO solution immersion test, the volume change rate is controlled at -3%~5%.

1. Design phase: 100% design review of CP1 equipment, lining thickness 3.5-8mm
2. Manufacturing phase: Establish process test panels and retain benchmark data
3. Operation and maintenance phase: 6-year inspection cycle for CP1 equipment, 10-year aging evaluation

Graded implementation of corrosion management

Equipment is divided into CP1-CP3 levels based on failure consequences and corrosion sensitivity:

• CP1: Strongly corrosive media equipment such as hydrochloric acid storage tanks
• CP2: Medium-risk equipment such as seawater pipelines
• CP3: General equipment such as desalted water systems

The standard proposes for the first time:

• The stratification aging evaluation method specified in Appendix F
• The combination of infrared spectroscopy (GB/T 7764) and thermogravimetric analysis (GB/T 14837)
• The quantitative standard for electric spark detection of pinhole defects