60-Year Life Nuclear Power Plant 1E-Class K1 Category Low-smoke Halogen-free Flame-retardant Cable

Implementation Standards

- Q/320481SS481-2022: Enterprise core standard (dedicated for 60-year long-life nuclear-grade cables)
- Conforms to general 1E-class K1 category cable qualification procedures, including stringent thermal aging, radiation resistance, vibration simulation, and LOCA accident simulation tests

Model Code Meanings

- H: Nuclear power plant cable series
- L/K/Y: Function — L: power; K: control; Y: instrumentation
- E: Insulation material code; J: LSZH sheath
- GP/P/P2: Copper wire braid or copper tape shielding
- K1: Nuclear safety class — installed inside containment, performing tasks under accident conditions
- (60): Design life marker — meets 60-year requirements

Specifications

Medium-voltage power cable (HLEJ-K1): 6/10kV, 8.7/15kV; 1x(35~400) mm²; 3x(35~240) mm²

Low-voltage power cable: 0.6/1kV; 1x(10~400) mm²; (2~6)x(1.5~240) mm²

Control cable (HKEJ-K1 / HKEJGP-K1 etc.): 0.6/1kV; (2~37)x(0.5~6) mm²

Instrumentation/compensation cable (HYEJGP-K1 / HBKXEJGP-K1 etc.): 300/500V; (1~12) groups; 2-core, 3-core, 4-core combinations; (0.5~2.5) mm²

Core Technical Parameters

- Rated voltage: 300/500V through 0.6/1kV to 15kV
- Design life: 60 years — verified by Arrhenius accelerated aging calculation for long-term physical and electrical stability
- Environmental resistance:
  - Radiation resistance: Special material modification for full-life accumulated high-dose gamma radiation; structure intact after LOCA accidents
  - Flame-retardant: Grade A bundled burning; excellent self-extinguishing
  - LSZH: Smoke transmittance >= 60%; HCI release <= 0.5%; non-toxic, non-corrosive; pH >= 4.3
- Max long-term conductor temperature: 90°C

Cable Structure

- Nuclear-grade conductors: High-purity annealed copper with excellent conductivity and vibration fatigue resistance
- High-performance nuclear-grade insulation: Radiation-resistant, high-temperature-resistant cross-linked polymer materials; maintains insulation strength under extreme temperature rise and radiation
- High-efficiency EMI shielding: High-coverage copper braid or wrapped shielding for absolute accuracy of reactor monitoring data
- Special flame-retardant fill and sheath: Grade B1 or above LSZH polyolefin internally and externally; outstanding flame retardancy, mechanical protection, and chemical corrosion resistance

Application Areas

- Nuclear island containment interior: Main pumps, safety valves, reactor monitoring instruments, emergency spray systems
- Safety-related systems (1E-class): Power and control lifelines for safe shutdown, decay heat removal, and accident consequence mitigation
- High-radiation high-safety locations: Other industrial facilities with extreme cable life, radiation resistance, and disaster tolerance requirements

60-Year Life and Accident Tolerance

Developed to fully consider nuclear plant full-lifecycle safety. Cables have passed combined simulated 60-year thermal aging and nuclear radiation aging tests, and successfully withstood LOCA accident qualification testing under high-temperature, high-pressure steam environments. Maximum use of stable nuclear-grade raw materials and precision triple co-extrusion manufacturing minimizes conductor eccentricity and void risks, ensuring high cable reliability throughout the nuclear plant design operating life.