GB/T 41241-2022 in English
VALIDManagement requirements for cybersecurity of industrial control systems in nuclear power plant
- Issued on:2022-03-09
- Implemented on:2022-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 41241-2022核电厂工业控制系统网络安全管理要求》由TC30（全国核仪器仪表标准化技术委员会）归口，TC30SC2（全国核仪器仪表标准化技术委员会反应堆仪表分会）执行，主管部门为国家标准化管理委员会。
Introduction
Analysis of the Standard Core Framework
| Module | Core Requirements | Technical Measures | Management Measures |
|---|---|---|---|
| Management System | Three Synchronization Principles | Security Policy Formulation | System Maintenance Mechanism |
| Technical Protection | Level 5 Defense in Depth | Industrial FirewallDeployment | Patch Management Process |
| Emergency Management | Nuclear Safety Collaboration | Intrusion Detection System | Annual Drill System |
Key technical protection requirements
1. Physical security protection
The computer room of a nuclear power plant must meet 9 protection requirements (anti-shock/windproof/rainproof/moisture-proof/fireproof/anti-static/lightning protection/anti-electromagnetic interference/radiation protection), and the record retention period of the electronic access control system should be ≥6 months.
2. Network boundary protection
- Use one-way isolation devices between production control area and management area
- Use protocol filtering industrial firewalls between control area and non-control area
- Prohibit high-risk protocols such as HTTP/FTP from passing through the security area
Implementation points and challenges
Nuclear safety coordination mechanism
Chapter 6.3 of the standard clearly requires that network security measures must not affect the nuclear safety function, and must pass:
- Simulation verification before change (for safety-level instrumentation and control systems)
- Dual approval process (technical department + nuclear safety regulatory department)
- Failure mode and effects analysis (FMEA)
Special scenario management
| Scenario | Requirements | Exceptions |
|---|---|---|
| Wireless communication | Disabling principle | Requires national security assessment |
| Remote maintenance | Strictly prohibited | No exceptions |
| Removable media | Physical destruction | Degaussing requires double supervision |
Standard evolution analysis
Compared with the protection requirements of traditional power monitoring systems, the innovations of GB/T41241-2022 are:
- Core features: For the first time, it is clarified that the network security level 5 system includes class=instrument> Reactor protection system
- Full cycle coverage: Full process control from design (Chapter 5.2) to decommissioning (Chapter 5.6)
- Trusted computing: Chapter 6.2.5 proposes a verification mechanism based on a root of trust
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