NB/T 20093-2012 in English

1 Scope

This standard establishes criteria for qualification of safety-related valve actuators, and actuator components in nuclear power plant in order to demonstrate their ability to perform their intended safety functions.
This standard is applicable to qualification of safety-related valve actuators and actuator components in nuclear power plant.

2 Normative References

The following documents are indispensable for the application of this document. For dated references, only the dated editions apply. For undated references, the latest editions (including all the amendments) apply.
GB/T 12727 Nuclear power plants - Electrical equipment of the safety system - Qualification
GB/T 13625 Seismic Qualification of Electrical Equipment of the Safety System for Nuclear Power Plants
NB/T 20086-2012 Evaluation, Monitoring and Mitigation of Safety Electrical Equipment Ageing in Nuclear Power Station
IEEE 101-1987 IEEE Guide for the Statistical Analysis of Thermal Life Test Data

3 Terms and Definitions

For the purposes of this document, the following terms and definitions apply.
3.1
Actuator
An electric, pneumatic, hydraulic, or electrohydraulic power-driven mechanism for positioning two-position or modulating valves, and dampers. Included are those components required to control valve action and to provide valve position output signals, as defined in the actuator specification.

1 Scope
2 Normative References
3 Terms and Definitions
4 General Provisions
5 Identification of the Generic Actuator Group
6 Qualification Testing of Selected Actuators in Generic Actuator Group
7 Qualification of Actuator for Specific Application
8 Documentation
9 Baseline Functional Test
10 Thermal Aging Test
11 Radiation Aging Test
12 Cycle Aging Test
13 Pressurization Cycle Test
14 Vibration Aging Test
15 Seismic Simulation Test
16 DBE Radiation Exposure Test
17 DBE Environment Test
Appendix A (Informative) Method of Selection of Representative Actuator(s) for Type Testing
Appendix B (Informative) Performance Verification Test
Appendix C (Informative) Rationale for Vibration and Seismic Test Methods