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Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 13625-2018: Seismic qualification of safety class electrical equipment for nuclear power plants Status: Valid GB/T 13625: Historical versions
Basic dataStandard ID: GB/T 13625-2018 (GB/T13625-2018)Description (Translated English): Seismic qualification of safety class electrical equipment for nuclear power plants Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: F65 Classification of International Standard: 27.120.10 Word Count Estimation: 46,447 Date of Issue: 2018-05-14 Date of Implementation: 2018-12-01 Older Standard (superseded by this standard): GB/T 13625-1992 Regulation (derived from): National Standards Announcement No. 6 of 2018 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 13625-2018: Seismic qualification of safety class electrical equipment for nuclear power plants---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Seismic qualification of safety class electrical equipment for nuclear power plants ICS 27.120.10 F65 National Standards of People's Republic of China Replace GB/T 13625-1992 Seismic identification of safety grade electrical equipment in nuclear power plants Published on.2018-05-14 2018-12-01 implementation State market supervision and administration China National Standardization Administration issued ContentForeword I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Introduction to seismic environment and equipment response 4 5 Seismic identification method 5 6 damping 6 7 Analysis 8 8 test 11 9 Analysis and testing combined 24 10 Experience 27 11 File 27 Appendix A (informative) The recommended damping value of typical electrical equipment in seismic analysis is 30 Appendix B (informative) Statistically independent movements 32 Appendix C (informative) Test duration and number of cycles 33 Appendix D (informative) vulnerability test 35 Appendix E (informative) Measurement of zero-cycle acceleration 36 Appendix F (informative) Frequency composition and stability 37 Appendix G (informative) Method for seismic identification using reference to empirical data 38ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 13625-1992 "Non-seismic appraisal of electrical equipment for safety systems of nuclear power plants", and GB/T 13625-1992 The main technical changes are as follows. --- Added damping related content (see Chapter 6 and Appendix A); --- Revised the requirements of the TRS low frequency band so that the low frequency displacement of the test device will not be too large (see 8.6.3.2); --- Increased the relevant content of the power spectral density envelope (see 8.6.3.2.1); --- Increased seismic identification methods combined with analysis and testing (see Chapter 9); --- Added guidelines for seismic identification through reference equipment seismic data (see Appendix G). This standard was proposed by China National Nuclear Corporation. This standard is under the jurisdiction of the National Nuclear Instrumentation Standardization Technical Committee (SAC/TC30). This standard was drafted. Shanghai Nuclear Engineering Research and Design Institute. The main drafters of this standard. Ma Yuanrui, Liu Gang, Xie Yongcheng, Yang Ren'an, Bi Daowei. The previous versions of the standards replaced by this standard are. ---GB/T 13625-1992. Seismic identification of safety grade electrical equipment in nuclear power plants1 ScopeThis standard specifies the resistance to verify that safety-grade electrical equipment can perform its safety functions during and/or after an earthquake. Implementation methods for seismic identification and their documentation requirements. This standard applies to seismic identification of safety grade electrical equipment in nuclear power plants, including the adverse effects of failure on the performance of safety systems. Any interface component or device.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 12727 Nuclear power plant safety grade electrical equipment identification3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Broadband response spectrum broadbandresponsespectrum A reaction spectrum that produces an amplification reaction motion over a wide frequency range is described. 3.2 Coherence function Characterize the relationship between the two time periods in the frequency domain. The coherence function gives the statistical correlation between the two motions as a function of frequency. The values range from 0 to 1.0, with a completely uncorrelated motion of 0 and a fully correlated motion of 1.0. 3.3 Correlation coefficient function correlationcoefficientfunction Characterize the relationship between two time periods in the time domain. The correlation coefficient function gives the statistical correlation between the two motions, which is a time delay. A function that is late as an argument. The values range from 0 to 1.0, with a completely uncorrelated motion of 0 and a fully correlated motion of 1.0. 3.4 Key seismic characteristics criticalseismiccharacteristics The ability to ensure that the equipment performs the required design, material and performance characteristics under seismic loading. 3.5 Cutoff frequency cutofffrequency The frequency at which the zero-cycle acceleration asymptote begins at the response spectrum. The frequency of a single-degree-of-freedom oscillator will no longer be amplified after exceeding this frequency. Into motion, this is the upper frequency limit of the waveform being analyzed. 3.6 Damping damping An energy dissipation mechanism that reduces the amount of amplification and broadens the vibration response in the resonance region. Damping is usually in percent of critical damping Said. Critical damping is defined as the minimum viscous damping value of a single-degree-of-freedom system that does not oscillate back to its original position after the initial disturbance. 3.7 Earthquake experience spectrum earthquakeexperiencespectrum; EES A response spectrum characterizing the seismic resistance of the reference device is determined based on seismic empirical data. 3.8 Flexible equipment flexibleequipment Equipment, structures, and components with a minimum resonant frequency that is less than the cutoff frequency of the reaction spectrum. 3.9 Range rule inclusion rules Determining the reference device group based on empirical data that has proven to be an acceptable range of physical characteristics, dynamic characteristics, and functionality of the seismic equipment rule. 3.10 Independent item independentitems Have different physical properties or withstand different seismic motion characteristics [eg different earthquakes, different sites, different structures, Or parts and equipment in different directions and/or positions of the same structure. 3.11 Narrowband response spectrum narrowbandresponsespectrum Describe a response spectrum that produces an amplification reaction in a finite (narrowband) frequency range. 3.12 Natural frequency When an object is deformed in a specific direction and then released, the object vibrates due to its own physical properties (mass and stiffness) Frequency of. 3.13 Running a baseline earthquake operatingbasisearthquake; OBE Combining regional and local geological and seismic conditions and the specific characteristics of local stratigraphic materials, it can be reasonable during the normal operating life of the power plant. An earthquake that is expected to occur at the site. Note. For the ground motion generated by the earthquake, those nuclear power plant facilities that need to continue to operate without excessive risk to the health and safety of the public can maintain their Features. 3.14 Power spectral density powerspectraldensity; PSD The mean square amplitude of a waveform per unit frequency, expressed in g2/Hz versus frequency. 3.15 Prohibited feature prohibitedfeatures In the case of seismic or test excitations that specify seismic capacity, detailed design of the structural integrity and functional failure or abnormality of the equipment may result. Material, structural features or mounting characteristics. 3.16 Qualified life Prove that the equipment meets the design requirements for the specified operating conditions prior to the Design Basis Event (DBE). 3.17 Reference device referenceequipment A device used to establish a reference device group. 3.18 Reference device group referenceequipmentclass A set of devices with the same attributes as determined by scope rules and forbidden features. 3.19 Reference site referencesite A site with a device or item that identifies a reference device group. 3.20 Require response spectrum requiredresponsespectrum; RRS The response spectrum specified by the user or his client in the identification technical requirements document, or artificially generated response spectrum that can cover future applications. 3.21 Resonance frequency The frequency at which the peak of the reaction occurs in a system subjected to forced vibration. At this frequency, the reaction has a phase difference with respect to the excitation. 3.22 Response spectrum A set of single-degree-of-freedom (SDOF) damped oscillators with a maximum response versus oscillator frequency as a function of the same fundamental excitation. 3.23 Rigid equipment rigidequipment Equipment, structures, and components with a minimum resonant frequency greater than the cutoff frequency of the reaction spectrum. 3.24 Safe shutdown earthquake safeshutdownearthquake; SSE Combine regional and local geological and seismic conditions and specific characteristics of local stratigraphic materials to assess the largest possible earthquake Determine an earthquake. Note. Some specific structures, systems, and components need to maintain their function under the maximum ground motion generated by the earthquake. These structures, systems and components are guaranteed The following requirements are required. a) the integrity of the reactor coolant pressure boundary; b) the ability to shut down the reactor and maintain the reactor in a safe shutdown state; c) The ability to prevent or mitigate the consequences of accidents outside the factory. 3.25 Seismic capacity The maximum level of earthquake that a proven device can withstand. 3.26 Sine beat wave sinebeats A continuous sine wave of a certain frequency whose amplitude is modulated by a lower frequency sine wave. 3.27 Stability stationarity When the waveform is stable, its amplitude distribution, frequency components, and other characteristic parameters do not change over time. 3.28 Test experience spectrum testexperiencespectra; TES A test-based response profile that determines the seismic resistance of a reference device group. 3.29 Test response spectrum testresponsespectrum; TRS The response spectrum obtained from the actual time course of the seismic mesa movement. 3.30 Transfer function transferfunction A complex frequency response function used to determine the dynamics of a linear system with constant coefficients. Note. For an ideal system, the transfer function is the ratio of the output to the Fourier transform of a given input. 3.31 Zero cycle acceleration zeroperiodacceleration; ZPA The high frequency, the level of acceleration of the unamplified portion of the response spectrum. Note. This acceleration corresponds to the maximum peak acceleration used to derive the time course of the response spectrum.4 Introduction to seismic environment and equipment response4.1 Earthquake environment The three-dimensional random ground motion generated by an earthquake can be characterized by simultaneous and statistically independent horizontal and vertical components. Although the whole An earthquake event may last for a long time, but its strong earthquake duration may be only 10s~15s. Ground motion is typical of wideband Machine motion may cause damage in the frequency range from 1 Hz to the response spectrum cutoff frequency. 4.2 Based equipment For equipment installed on a foundation, the vibration characteristics of ground motion (horizontal and vertical) may be amplified or attenuated. For any given Ground motion, amplification or attenuation depends on the natural frequency and damping dissipation mechanism of the system (soil, foundation and equipment). Most of the ground sports The broadband response spectrum is described to show that multi-frequency excitation plays a leading role. 4.3 Structural equipment Ground motion (horizontal and vertical) can produce amplified or attenuated narrowband motion in the structure due to the filtering of the associated structure. Structurally The dynamic response acceleration of the device will be further amplified or attenuated, up to several times or a fraction of the maximum ground acceleration. Depends on the damping and natural frequency of the device. A narrow-band response spectrum is usually used to describe the floor motion of the structure, indicating the components of the equipment Single frequency excitation plays a leading role. Similar filtering effects in the motion of the structure can also occur in flexible piping systems. For not supporting The final movement of the assembled components may be a single frequency dominated by the resonant frequency of the tube system (or its vicinity). This resonance condition will be installed in the pipeline The upper part produces the most demanding seismic loads. 4.4 Simulated earthquake 4.4.1 Overview The purpose of seismic simulation is to replicate the assumed seismic environment in a viable manner. Modulus used to identify equipment using analytical or experimental methods The quasi-seismic motion can be given in any of the following forms. a) response spectrum; b) time course; c) Power spectral density (PSD). Simulated seismic motion can be generated for substructures of foundations, structures, or installation equipment. These simulated earthquake movements are usually done by users or Its principal is specified in the equipment specification. Due to the directionality of seismic motion and the directionality of output motion after filtering of structures and equipment structures, the directional component of motion and its The role of the equipment should be specified or described in other appropriate ways. 4.4.2 Response spectrum The response spectrum gives the maximum response information for a single-degree-of-freedom oscillator for a given input motion, which is a function of the oscillator frequency and damping. anti- The spectrum gives the frequency component of the input motion and the peak motion (ie zero period acceleration). It should be noted that the response spectrum does not provide the following information. a) an excitation waveform or time course that produces a response spectrum; b) duration of exercise (this should be specified in the corresponding identification technical requirements document); c) Dynamic response of any particular device. 4.4.3 Time history The function of the motion (usually acceleration) caused by an earthquake as a function of time is the time course. The motion simulated during the seismic qualification test comes from Actual or artificially generated seismic records. For any floor, the resulting time course includes dynamic filtering of structures and other intermediate support structures. Wave and amplification effects. 4.4.4 Power spectral density function The power spectral density characterizes the mean square value of the vibration amplitude in a unit frequency of a motion parameter, which is a function of frequency. Note. Although the response spectrum and power spectral density functions do not determine the exact excitation waveform or duration, they are still useful tools that can be used on a curve. Get the important frequency characteristics of the movement. The power spectral density directly gives information about the excitation, but does not consider the incentive pair as a response spectrum. The role of the degree of freedom oscillator. Therefore, using the transfer function theory of a linear system, the relationship between excitation and reaction can be determined based on the power spectral density. 4.5 Support structure and interaction Seismic identification of equipment requires consideration of installation characteristics, such as. a) seismic suitability of the support structure (support assembly, structure, anchor, floor, wall or foundation); b) the possibility of harmful seismic interactions (drops on the above components, adjacent impacts, different displacements, sprays, flooding or Fire).5 Seismic identification method5.1 Overview The seismic identification of the equipment shall demonstrate that the equipment performs its safety during and/or after the force generated by a safe shutdown earthquake. Functional capabilities. In addition, the equipment should withstand several operational baseline earthquakes before being subjected to a safe shutdown earthquake. 5.2 Seismic identification technical conditions Seismic identification requires clear specifications for the equipment to be certified. See Chapter 11 for details. The technical conditions for seismic requirements should be clearly defined to include at least. duration, frequency range and acceleration value. Providing these data information Can be. a) a vibrational motion expressed in terms of power spectral density (a function of frequency); b) the duration of the strong earthquake part of the earthquake; c) the required response spectrum at the equipment installation point, the response spectrum must include data for the main horizontal and vertical axes, and different damping ratios Data (eg 2%, 5% and 7%); d) The relationship between the maximum acceleration on the equipment installation point (floor or structure) and the important frequency or time history curve. For operational baseline seismic (OBE) and safe shutdown earthquakes (SSE), the shape and magnitude of the response spectrum may vary. Therefore, in order to The test pieces are identified and the acceleration spectrum corresponding to these seismic levels should be known. The technical conditions should state the rationality of the reaction spectrum used. 5.3 Common seismic identification methods There are usually four commonly used methods for seismic identification. a) predicting device performance through analysis; b) testing the equipment under simulated seismic conditions; c) using a combination of testing and analysis to identify the equipment; d) Identify the device by using empirical data. Each of the above methods, or other proven methods, is suitable for verifying the seismic performance of the equipment. Select the applicable identification method to There are a few factors to consider. a) the type, size, shape and complexity of the equipment structure; b) whether the security function is verified by (device) operability or only by structural integrity; c) Reliability of the conclusion. The equipment being certified should be able to demonstrate that its safety functions can be performed during and/or after the earthquake. The required security features depend not only on The equipment itself also depends on the role of the equipment in the system and in the power plant. Safety functions during an earthquake may be related to the safety required after an earthquake The function is the same or it may be different. For example, an electrical device may be required to not malfunction during an earthquake, or during and after an earthquake. Perform an active function, or may require it to remain intact during an earthquake and require an active function after an earthquake, or these requirements Any combination. For another device, it may only be required to maintain structural integrity during and after an earthquake. 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