GB/T 13626-2021 in English
VALIDApplication of the single-failure criterion for nuclear power plant safety systems
- Issued on:2021-12-31
- Implemented on:2022-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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| Standard No: | GB/T 13626-2021 |
| Document status: | VALID |
| Title in English: | Application of the single-failure criterion for nuclear power plant safety systems |
| Title in Chinese: | 单一故障准则应用于核电厂安全系统 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-12-31 |
| Implemented on: | 2022-07-01 |
| Superseding: |
GB/T 13626-2008 Application of the single failure criterion to safety systems in nuclear power plant
|
| 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 Topics: | Fault
Failure Analysis System single single signal fault display Single Failure Criterion Applied to Nuclear Power Plant Safety System GBT13626 GB/T 13626-2001 GB/T 13626-2008 GB/T 13626-2021 Nuclear power plant safety Information system annual failure rate international China Nuclear Power |
《GB/T 13626-2021单一故障准则应用于核电厂安全系统》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 core content of the standard
GB/T13626-2021, as a mandatory standard for the design of nuclear power plant safety systems, has made important revisions to the 2008 version:
- Strengthen the definition of common cause failures (Clause 3.4)
- Add requirements for the assessment of undetectable failures (Clause 5.2)
- Optimize the design basis event analysis process (Clause 5.4)
Comparison of key technical requirements
| Technical elements | Requirements of the 2008 version | Changes in the 2021 version |
|---|---|---|
| Common cause failures | Definition explanation only | Add screening flow chart (Figure 1) |
| Undetectable faults | No clear requirements | Add Appendix A example description |
| Digital system | No special instructions | Add common cause failure protection requirements (Clause 5.5) |
Fault classification management
Detectable fault implementation case
For the failure of the middle position contact of the three-position switch:
- Real-time monitoring is achieved by improving the design of the indicator light circuit
- Establish a regular continuity test system (recommended cycle ≤3 months)
Solutions for undetectable faults
For software logic defects in digital control systems:
- Improve the V&V verification process (cover all test modes)
- Adopt the diversity design principle (GB/T13629)
Design analysis implementation steps
The 10-step analysis method specified in Chapter 6 of the standard:
Steps 4-6: Failure mode analysis → Independence verification → Non-independent system assessment
Steps 7-10: Probability assessment supplement → Multi-dimensional fault analysis → Coupled system inspection → Malfunction prevention
Defense in depth strategy
Three-layer protection against common cause failures:
| Protection Level | Measures | Standard Basis |
|---|---|---|
| Design Defense | Equipment Identification/Diversity Design | GB/T9225 5.5 Clause |
| Operation Defense | Staff Training/Procedure Control | GB/T13286 |
| Maintenance Defense | Periodic Test System | Appendix A.2 |
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