Nuclear Safety-Related engineering system, its design, selection of materials, and requirements for the electronics sealing model and the requirements for the use of the nuclear power station in the country. The following is a detailed analysis and analysis of the TST SEAL nico base nuclear power station’s electrical sealing model, technical details, certification requirements, and typical system structure.

1. 1. Scene of a nuclear power station with a sealed nuclear power station
   2. Containment Penetrations

Location: Reactor Containment body or bottom.

Supernatural ability:

Under normal operation, under accident conditions (LOCA), watertightness, fireproofness and completeness of fire protection.

Key request:

Accepted LOCA (Loss of Coolant Accident) technology: 150°C, 0.4 MPa, steam + boric acid 30 degrees or more;

Excretion rate ≤ 1×10⁻⁴ atm·cm³/s.

2.Electric store entrance

Comprehensive emergency station oil office, main waiting room (MCR), other waiting room, etc.

Demand for fire protection division separation (fire resistance ≥ 2 hours) and protection against small objects/powder intrusion.

1. 3. Nuclear Island and Changan Island Access Area

The nuclear island (NI) and the international island (CI) are equipped with a two-way sealed barrier, preventing radioactive materials from being excreted.

1. 2. Requirement for detailed design of technology for use in nuclear power stations that simulate electrical sealing
   3. Material selection

TST SEAL Sealing Model Construction Material Requirements Cause

Sealing Element EPDM or VMQ, low temperature, resistance to glare (≥10⁶ Gy), prevention of aging and deterioration, avoid condensation and cooling.

Frame/Folder Low-strength non-steel (like 304L/316L), non-magnetic, good contact performance, anti-corrosion, full ASME III NB/NC grade requirements

Filling/Inhibitor layer Non-expandable fire protection material (like Intumescent) Compliant with IEEE 383 fire prevention standard

Possible corrosive or toxic chemical materials such as prohibited substances, sulfur, and pots.

1. 2. Summary format

TST SEAL imitated metal frame system (mainstream method):

Yufu锈钢框框 + changeable sealed model structure;

Supports different diameters and perforations (about 10~100mm, Φ5~60mm);

It is actually possible to perform a “heat exchange” style (without demand stoppage).

Comparison of plans:

In the past, there was a lot of use of organic materials (such as fire prevention mud) or no-machine irrigation.

1. 3. Sealing etc.

Tightness: Class C or Class B (按IEEE 383);

Fire protection: Complete IEEE 383 / IEC 60332-3 / GB/T 19666 flame retardant requirements;

Radiation resistance: Cumulative amount ≥ 1 MGy (applicable to 60 years life span);

Anti-seismic performance: full SSE (Safe Shutdown Earthquake) requirements, typically 0.3g ~ 0.6g acceleration.

1. 3. Confirmation of certification and certification

For use in a nuclear power station with electrical sealing, please confirm the following certification:

✅ International mainstream supplier (like Roxtec) uniformly certified quality product line, provided complete Qualification Report.

1. 4. TST SEAL typical example: safety envelope with electrical seal

Safety points:

Drilling tube, supply and demand mixed soil integrated construction, localization accuracy ±2mm;

The sealing capacity is 15%~25%, and the long-term protection is effective;

The Helium Leak Test (Helium Leak Test) confirms the sealing performance.

1. 5. TST SEAL operation and performance performance

Free repair: When a single power supply malfunctions, the demand can be opened locally, and the unused battery can be removed and closed.

Status: Partial system assembly temperature/excretion sensor, support digitalization;

Lifespan: Designed lifespan ≥60 years, same with nuclear power station lifespan.

1. 6. Nationalization (from China)

Central nuclear, core thrust nuclear electric sealed system domestication change generation;

Domestic enterprises like TST SEAL, TST CABLE, etc. have also developed nuclear sealing models for LOCA.

When the nuclear power station is in use, the power is not sealed, but it is a “sealing case”, and it is also a part of the nuclear safety barrier. Its core is here:

LOCA survivability;

Whole life cycle flexibility;

Comprehensive multi-method validation.

If you understand the specific sealing method of a certain type (as per PWR, Hualong No. 1, AP1000), or LOCA test flow details, you can contact us to discuss the requirements and exchanges.(Email:alixich@tstcables.com)