NB/T 20320-2014 in English
VALIDCriteria for nuclear power plant response to an earthquake
- Issued on:2014-10-15
- Implemented on:2015-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
$670.00
Introduction
Standard Overview
NB/T 20320-2014 specifies the systematic response measures that nuclear power plants need to take in earthquake events, including:
- Preventive preparation before earthquake (Chapter 5)
- Short-term emergency response after earthquake (Chapter 6)
- Post-shutdown inspection and testing (Chapter 7)
- Long-term safety assessment (Chapter 8)
Core term analysis
| Terms | Definition | Technical points |
|---|---|---|
| Operational Base Earthquake (OBE) | The ground motion parameters do not exceed the limits of NB/T 20077, and the power plant can continue to operate safely | Equivalent to SL-1 earthquake, data evaluation must be completed within 4 hours |
| Safe Shutdown Earthquake (SSE) | Design basis ground motion, requiring the integrity of the reactor coolant pressure boundary to be maintained | Equivalent to SL-2 earthquake, long-term evaluation requires comparison with the actual response spectrum |
| EDIS level | Earthquake damage severity classification (0-3 levels) | Determine whether extended inspection and restart conditions are required |
Key Technical Requirements
1. Pre-earthquake preparation
Three core tasks must be completed:
- Develop a plant-specific earthquake response procedure (including a checklist)
- Select 20% of safety-related equipment as key inspection samples
- Implement benchmark inspections and establish equipment status files
2. Post-earthquake response process
Typical time nodes:
- 0-4 hours: Main control room parameter comparison, NB/T 20077 seismic data evaluation
- 4-8 hours: Operator inspection, shutdown necessity determination
- 12-24 hours: Key inspection (EDIS classification)
- 1-4 weeks: Extended inspection (when EDIS ≥ 1)
Inspection implementation specifications
Key inspection requirements
| Equipment type | Inspection ratio | Typical items |
|---|---|---|
| Seismic Class I equipment | ≥20% | Main pump, containment penetrations |
| Non-seismic equipment | 100% | Suspended ceiling, fire protection pipe network |
| Structures | Full inspection | Concrete cracks＞1.5mm need to be recorded |
EDIS classification standard
- Level 0: No damage, can be restarted directly
- Level 1: Non-safety related equipment is damaged, and extended inspection is required
- Level 2: Safety equipment is slightly damaged, and restart is required after repair
- Level 3: Severe structural damage, long-term evaluation is required
Implementation Suggestions
It is recommended that power plants establish a three-dimensional inspection matrix:
| Dimension | Content | Tool |
|---|---|---|
| Spatial Dimension | Inspection by Elevation Zone | Floor Response Spectrum Analysis |
| Professional Dimension | Mechanical/Electrical/Instrumentation/Civil Engineering Joint Inspection | Appendix F Inspection Table |
| Time Dimension | 72-hour Emergency Inspection Window | EDIS Rapid Assessment Method |
Note: For reactor pressure vessels, it is recommended to use non-destructive testing technologies such as acoustic emission.
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
NB/T 10923-2022 in English
Safety requirements of wind turbine converter
2022-05-13 -
NB/T 10963-2022 in English
Remanufacturing of mining equipment—Management requirements for the use of personal protective equipment
2022-05-13 -
NB/T 31043-2019 in English
Technical specification for main control system of offshore wind turbine generator system
2019-06-04 -
NB/T 10311-2019 in English
Code for Design of Wind Turbine Foundations for Onshore Wind Power Projects
2019-11-04 -
NB/T 11073-2023 in English
Electrical system safety design requirements for plateau wind turbines
2023-02-06 -
NB/T 11194-2023 in English
Technical guideline for new-type energy storage planning for power delivery of new energy resource base
2023-05-26 -
NB/SH/T 0891-2014 in English
Spectrophotometric detection of soot in used engine oil samples
2014-06-29 -
NB/T 10555-2021 in English
Technical specification for preheat mine inlet air by coal mine methane regenerative oxidation device
2021-01-07 -
NB/T 42162-2018 in English
Design specification for selection of small hydropower units
2018-06-06 -
NB/T 20439-2017 in English
EvaLuatiaa rule of pressure-temperaturel limit curves for reactor pressure vessel of pressurized water reactor nuclear power plants
2017-04-01
