1.0.1 This code is formulated with a view of carrying out such guidelines as “earthquake prevention first” and “civil nuclear facility safety first”, realizing the safe operation, high quality, state-of-the-art technologies, economic feasibility of the nuclear power plants.
1.0.2 This code is applicable to the seismic design of nuclear safety-related items in pressurized water reactor (PWR) nuclear power plants, where the peak acceleration of the ultimate safety ground motion is not larger than 0.5g.
Nuclear power plants, designed according to the provisions, shall run well when being affected by the seismic motion equal to the operational safety ground motion; they also shall ensure the reactor coolant pressure boundary intact, the reactor safely shutdown and maintain safe off-state, and the spillovers of the radioactive substances not exceed the national limitation when being affected by the ultimate safety ground motion.
Note: ① Items in this code are referred to containments, buildings, structures, underground structures, pipes, equipments and other related parts.
② G is the acceleration of gravity, with the value for 9.81m/s2.
1.0.3 The items of the nuclear power plants shall be divided into the following three classes according to the significance of their requests for nuclear safety:
(1) Class Ⅰ items: the nuclear safety-related important items in the nuclear power plants, including items which can directly or indirectly cause accidents after damaged; items needed to ensure the reactor be able to safely shutdown and maintain off-state as well as remove the residual heat; items needed to alleviate the damages caused by the nuclear accidents during and after the earthquake, as well as other items which will endanger the above mentioned items when being damaged or de-functioned.
(2) Class Ⅱ items: nuclear safety-related items (in addition to class Ⅰ items) in the nuclear power plants and nuclear safety-irrelevant items which can endanger the above named items when being damaged or de-functioned.
(3) Class Ⅲ items: nuclear safety-irrelevant items in the nuclear power plants.
Note: classⅠ, Ⅱ and Ⅲ items may be divided according to the examples of Appendix A.
1.0.4 The seismic design of all the items shall be in accordance with the following seismic protection standards:
(1) ClassⅠ items shall, simultaneously, adopt the operational safety ground motion and the ultimate safety ground motion for seismic design;
(2) Class Ⅱ items shall adopt the operational safety ground motion for seismic design;
(3) Class Ⅲ items shall be in accordance with the national current related codes for seismic design.
1.0.5 As for the seismic design of the nuclear power plant, not only the requirements stipulated in this code, but also those in the current relevant ones of the nation shall be complied with.
Contents
1 General Provision
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Basic Requirements for the Seismic Design
3.1 Computation Model
3.2 Seismic Calculation
3.3 Seismic Action
3.4 Effect Combination and Section Seismic Checking
3.5 Seismic Construction Measures
4 Design Ground Motion
4.1 General Rules
4.2 Acceleration Peak Value of the Ultimate Safety Ground Motion
4.3 Design Response Spectrum
4.4 Design Acceleration Time Course
5 Foundations and Slope
5.1 General Rules
5.2 Foundation Checking against Sliding
5.3 Foundation Liquefaction Estimation
5.4 Slope Seismic Stability Checking
6 Containments, Buildings and Structures
6.1 General Rules
6.1.1 This chapter is applicable to the concrete containments and classⅠ/Ⅱ buildings and structures.
6.2 Actions and Effect Combinations
6.3 Stress Calculation and Section Design
6.4 Foundation Seismic Checking
7 Underground Structures and Underground Pipes
7.1 General Rules
7.1.1 This chapter is applicable to the classⅠ/Ⅱ underground structures and underground pipes.
7.2 Seismic Calculation of the Underground Structures
7.3 Seismic Calculation of the Underground Pipes
7.4 Seismic Checking and Construction Measures
8 Equipments and Parts
8.1 General Rules
8.3 Effect Combination and Design Limitation
8.4 Seismic Effect Calculation
9 Process Pipes
9.1 General Rules
9.2 Effect Combination and Design Limitation
9.3 Seismic Effect Calculation
10 Seismic Detections and Alarm
10.1 Instrument Installation
10.2 Instrument Performance
10.3 Observation Station Installation
Appendix A Classification Examples of All Kinds of the Items
Appendix B Effect Combinations adopted by the Buildings and Structures and the Relevant Coefficients
Appendix C Ground Motion Attenuation Law
Appendix D Calculation Methods and Diagrams of the Underground Structure Seismic Effect
Appendix E Correction of the Design Floor Response Spectrum
Appendix F Allowable Stress and Design Limitation
Adopted by the Equipments and Parts
F.1 Allowable Stress
Appendix G Verification Test
Appendix H Word Explanation
Chief Development Organization, Participating Organizations and Chief Drafting Staffs
