1. Application scenarios：
Nuclear power bursting disc focuses on the safety of the core system of nuclear reactors. It mainly serves key equipment such as pressure vessels and main air ducts. It needs to deal with extreme working conditions such as design benchmark accidents, such as protecting nuclear safety-grade components such as reactor ventilation systems and pressure relief boxes. Its application scenarios are directly related to nuclear safety. The medium often involves radioactive materials, and the consequences of leakage are serious.
Bursting disc in the power industry covers the whole chain of thermal power generation and is suitable for pulverized coal boilers, gas turbines, steam pipelines and other equipment. For conventional pressure fluctuation protection, the medium is mostly non-radioactive fluids such as steam and air, and the application scenarios focus more on conventional industrial safety.
2. Technical standards：
Nuclear power bursting disc must strictly follow the ASME Volume III classification specification: Level 1 parts are limited to air/gaseous media only, and cannot be used as the only discharge device; Level 2 parts can cover steam but need to be equipped with a fully boring valve; Level 3 parts can be used for liquids after approval and can be used as a separate discharge device. As a military technology transformation enterprise, Shenyang Xinguang Hangyu's nuclear power products also need to pass the seismic and load analysis of the Nuclear Power Design Institute.
The non-nuclear-grade classification requirements of bursting disc in the power industry mainly meet general industrial standards, focusing on pressure response accuracy and installation convenience. Although it needs to pass ISO system certification, it does not need to meet special indicators such as nuclear-grade seismic resistance and long life (such as 40 years).
3. Design characteristics：
Nuclear power bursting disc presents customized characteristics: for example, DN1600mm flat-panel products adopt a double semicircular splicing design, which not only reduces the cost of unconventional materials, but also adapts to the large-diameter installation requirements of the main air duct, while strengthening the structural strength through the support beam. Its sealing design must meet the standard of " tight and leak-free" and be suitable for the storage of toxic or precious media.
Bursting disc in the power industry focuses more on standardization and versatility, and adopts mature structures such as anti-arch grooving and positive arch slits. For example, anti-arch products are adapted to pressure fluctuation scenarios with fatigue resistance, and there is no need to strengthen the special structure for extreme accidents, and maintenance and replacement are more convenient.
4. The core functions：
Nuclear power bursting disc is based on the “accident bottom” as the core, and it needs to break accurately at the moment of overpressure to maintain the integrity of the main equipment. For example, the EVCO model is designed for the protection of the main air duct under the design benchmark accident, with a pressure control accuracy of ±3.5kPa. The consequences of its failure are directly related to nuclear safety, so more emphasis is placed on “one-time precise protection”.
Bursting disc in the power industry aims at “conventional overpressure protection” to deal with abnormal pressure fluctuations in equipment operation. When used in conjunction with safety valves, it focuses on “fast response + easy maintenance”, eliminating the need to carry accident-level risk protection, and paying more attention to daily safety and security efficiency.
