GB/T 13629-2023 in English
VALIDCriteria for programmable digital devices in safety systems of nuclear power generating stations
- Issued on:2023-12-28
- Implemented on:2024-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | GB/T 13629-2023 |
| Document status: | VALID |
| Title in English: | Criteria for programmable digital devices in safety systems of nuclear power generating stations |
| Title in Chinese: | 核电厂安全系统中可编程数字设备的适用准则 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2023-12-28 |
| Implemented on: | 2024-04-01 |
| Superseding: |
GB/T 13629-2008 Applicable criteria for digital computers in safety systems of nuclear power plants
|
| ICS Classification: | 27.120.20-Nuclear power plants. Safety |
| Chinese Classification: | F83-Distribution equipment for reactor and nuclear power plant safety |
| Professional Classification: | GB-National Standard |
| Related Keywords: | programmable digital devices
commercial-grade digital equipment digital instrumentation nuclear power digital device security precautions |
| Related Topics: | GBT13629
GB/T 13629-1998 GB/T 13629-2008 Nuclear power plant digital systems and network security |
《GB/T 13629-2023核电厂安全系统中可编程数字设备的适用准则》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委。
Introduction
Interpretation of the core content of the standard
GB/T 13629-2023, as an important standard in the field of digital instrumentation and control of nuclear power plants, has been comprehensively upgraded from the 2008 version. The main technical changes include:
- The scope of application has been expanded from digital computers to programmable digital devices (PDDs)
- Six new key term definitions, including safe state and functional state, have been added
- The requirements for applicability confirmation (5.17) and common cause failure protection (5.16) of commercial-grade items have been strengthened
- The safety development and operation environment (SDOE) assessment system has been added (5.9)
Comparison of key criteria for safety systems
| Technical elements | Requirements of the 2008 version | New requirements of the 2023 version |
|---|---|---|
| Independence | Basic electrical isolation | Add communication independence (5.6.5.2) and buffer circuit design specifications |
| Equipment Qualification | Hardware environmental stress test | Requires full system qualification including representative software (5.4) |
| Access control | Physical security precautions | Add digital device security precautions (5.9.2) and SDOE evaluation |
Key points for the implementation of suitability confirmation of commercial-grade items
Appendix D of the standard specifies in detail the four-step confirmation method for commercial-grade digital equipment:
- Identification of key characteristics: physical characteristics (such as power requirements), performance characteristics (such as response time), development process characteristics (such as V&V activities)
- Combination of acceptance methods: a combination of special testing (method 1), commercial investigation (method 2), and source verification (method 3) can be adopted
- Compensation measures: in view of the inadequacy of the supplier's quality assurance system, it is necessary to formulate design restrictions or operating procedures to compensate
- Change management: establish full life cycle traceability, and hardware/software changes require re-evaluation of equivalence
Typical application case: when a nuclear power plant uses a PLC controller, the suitability confirmation is completed through CRC verification (physical characteristics), worst-case response test (performance characteristics), and supplier code review (development process characteristics).
Evolution of Common Cause Failure Protection Technology
D3 analysis (diversity and defense in depth) requirements proposed in 5.16 of the standard:
- Use FTA+FMEA combined analysis to identify software CCF weaknesses (Appendix A)
- Achieve processor/operating system level diversity through heterogeneous design
- Establish conservative failure modes to ensure that a safe state is entered during CCF
- Require quality certification for non-safety-level diversity equipment (Appendix C.5)
The new version of the standard places special emphasis on reducing CCF risks through deterministic testing (5.16): all input combinations, logic paths, and state transitions must be verified.
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