Detail of GB/T 13538-2017

Introduction of GB/T 13538-2017

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 13538-1992 Electrical penetration assemblies in containment structures for nuclear power plants. In addition to a number of editorial changes, the following technical changes have been made with respect to GB/T 13538-1992: ——The normative references are modified (see Clause 2 hereof; Clause 2 of Edition 1992); ——Some terms and definitions are modified (see Clause 3 hereof; Clause 3 of Edition 1992); ——The contents related to “optical fiber” are added (see Clause 4 to Clause 10); ——The rated voltage of power and control conductors are added and revised for adaptation according to relevant national standards (see 4.2.1); ——The power frequency withstand voltage and impulse voltage withstand test values of dielectric strength test are adaptively revised for adaptation according to the revised rated voltage of the equipment, (see 6.2.4); ——The contents related to “electromagnetic compatibility” are added (see 6.2.11); ——the contents related to “severe accident” are added (see 6.4); ——The requirement of "partial discharge (corona) test" are added (see 7.6); ——Clause 10 is added and includes the contents of the original Annex A; ——The original Annex B is modified into Annex A, and the contents are revised; ——Annexes B, C and D are added. This standard was proposed by China National Nuclear Corporation. This standard is under the jurisdiction of the National Technical Committee on Nuclear Instruments of Standardization Administration of China (SAC/TC 30). The previous edition of the standard replaced by this standard is as follows: ——GB/T 13538-1992. Electrical penetration assemblies in containment structures for nuclear power plants 1 Scope This standard specifies the requirements for the design, manufacturing, qualification, test, installation and in-service monitoring of electrical penetration assemblies in containment structures for nuclear power plants. This standard is applicable to the design, manufacturing, qualification, test, installation and in-service monitoring of electrical penetration assemblies in containment structures for nuclear power plants. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 156-2007 Standard voltage GB/T 311.1-2012 Insulation co-ordination—Part 1: Definitions, principles and rules GB/T 12727-2017 Qualification of safety class electrical equipment for nuclear power plants GB/T 13625 Seismic qualification of safety class electrical equipment for nuclear power plants GB/T 15972.40-2008 Specifications for optical fibre test methods—Part 40: Measurement methods and test procedures for transmission and optical characteristics—Attenuation GB/T 15972.41-2008 Specifications for optical fibre test methods—Part 41: Measurement methods and test procedures for transmission and optical characteristics—Bandwidth GB/T 15972.42-2008 Specifications for optical fibre test methods—Part 42: Measurement methods and test procedures for transmission and optical characteristics—Chromatic dispersion GB/T 15972.43-2008 Specifications for optical fibre test methods—Part 43: Measurement methods and test procedures for transmission and optical characteristics—Numerrical aperture GB/T 15972.44-2008 Specifications for optical fibre test methods—Part 44: Measurement methods and test procedures for transmission and optical characteristics—Cut-off wavelength GB/T 15972.45-2008 Specifications for optical fibre test methods—Part 45: Measurement methods and test procedures for transmission and optical characteristics—Mode field diameter GB/T 15972.46-2008 Specifications for optical fibre test methods—Part 46: Measurement methods and test procedures for transmission and optical characteristics—Monitoring of changes in optical transmittance GB/T 15972.47-2008 Specifications for optical fibre test method—Part 47: Measurement methods and test procedures for transmission characteristics—Macrobending loss GB/T 15972.48-2016 Specifications for optical fibre test method—Part 48: Measurement methods and test procedures for transmission characteristics—Mpolarization mode dispersion GB/T 15972.49-2008 Specifications for optical fibre test methods—Part 49: Measurement methods and test procedures for transmission and optical characteristics—Differential mode delay GB/T 15972.50-2008 Specifications for optical fibre test methods—Part 50: Measurement methods and test procedures for environmental characteristics—Damp heat(steady state) GB/T 15972.51-2008 Specifications for optical fibre test methods—Part 51: Measurement methods and test procedures for environmental characteristics—Dry heat GB/T 15972.52-2008 Specifications for optical fibre test methods—Part 52: Measurement methods and test procedures for environmental characteristics—Change of temperature GB/T 15972.53-2008 Specifications for optical fibre test methods—Part 53: Measurement methods and test procedures for environmental characteristics—Water immersion GB/T 15972.54-2008 Specifications for optical fibre test methods—Part 54: Measurement methods and test procedures for environmental characteristics—Gamma irradiation GB/T 17626 (all parts) Electromagnetic compatibility—Testing and measurement techniques GB 17799.4-2012 Electromagnetic compatibility (EMC)—Generic standards—Emission standard for industrial environments 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 analysis process of mathematical or other logical inference to derive the qualified conclusion of electrical penetration assembly or its components from specified preconditions 3.2 design basis events (DBE) postulated events used in the design to establish the acceptable performance requirements of the structures, systems and equipment [NB/T 20063-2012, Definition 2.6] 3.3 service conditions Environmental parameters, power, signal, limit working conditions under normal operation requirements of electrical penetration assembly and assumed working conditions under design basis events 3.4 design service conditions service conditions as the basis for rated value and qualification of electrical penetration assembly 3.5 design tests tests to verify that electrical penetration assembly meets design requirements 3.6 single aperture seal single seal between containment aperture and electrical penetration assembly 3.7 single optical fiber seal single pressure barrier seal along the optical fiber axis between the inner and outer sides of the containment structure 3.8 single electric conductor seal single pressure barrier seal along the electric conductor axis between the inner and outer sides of the containment structure 3.9 double aperture seal two single aperture seal connected in series 3.10 double electric conductor seal two single electric conductor seal connected in series 3.11 double optical fiber seal two single optical fiber seal connected in series 3.12 containment structures that contain reactors and associated systems and prevents unacceptable amounts of radioactive material from being released into the environment under reactor accident. It is the last barrier to contain radioactive materials, and it can also prevent the impact of external projectiles and explosions on the reactor 3.13 electrical penetration assembly a set of equipment consisting of insulated electrical conductors (or optical fibers), conductor seals, and assembly seals (if any) that provides a pressure barrier between the inner side and the outer side of the containment (or the outer side of the concrete wall), and provides access to the electrical conductors (or optical fibers) through a single aperture (or double aperture) Note: The electrical penetration assembly also include junction boxes and internal wiring components. 3.14 environmental conditions external environmental operating conditions of electrical penetration assembly include the external conditions under normal operating conditions, design basis events and assumed working conditions caused by severe accident conditions, such as ambient temperature, pressure, radiation, humidity, ground motion, chemical or desalted water spraying (or splashing) and immersion, etc. 3.15 generic design equipment series with similar materials, manufacturing process, ultimate stress, design scheme and working principle, which can be uniformly qualified by a simplified typical equipment 3.16 installed life time interval from the completion of installation to permanent decommissioning of electrical penetration assembly Note: During this period, electrical penetration assembly performs its functions. Some parts of electrical penetration assemblies may be replaced regularly; therefore, the installed life of the replaced part is lower than that of the electrical penetration assembly.   3.17 margin difference between the most severe design operating conditions and the conditions adopted in the qualification test 3.18 qualified life time where a structure, system or component has been tested, analyzed and/or operated to demonstrate that it can operate within the acceptance criteria under specific operating conditions, while implementing the safety function under design basis events or earthquake conditions [NB/T 20063-2012, Definition 6.1.8] 3.19 severe accident conditions assumed working conditions under which the environmental conditions are more severe than the design basis events. The electrical penetration assembly shall meet the performance requirements under such conditions. The containment pressure boundary integrity function of electrical penetration assembly may be degraded 3.20 qualified life test test carried out on samples that have been pre-operated to verify that the electrical penetration assembly meets the design requirements at the end of the qualified life 4 Classification and rated value 4.1 Classification 4.1.1 Medium-voltage power Power conductors in electrical penetration assembly with rated voltages greater than 1,000V are defined as "medium-voltage power conductors" and have the following rated values (see 4.2 and 4.3): a) Rated voltage; b) Rated continuous current; c) Rated short-time overload current and duration; d) Rated short-circuit current; e) Rated short-circuit heat capacity; f) Rated capacity under the most severe DBE environment conditions. 4.1.2 Low-voltage power Power conductors in electrical penetration assembly with rated voltages less than or equal to 1,000V are defined as "low-voltage power conductors" and have the following rated values (see 4.2 and 4.3): a) Rated voltage; b) Rated continuous current; c) Rated short-time overload current and duration; d) Rated short-circuit current; e) Rated short-circuit heat capacity; f) Rated capacity under the most severe DBE environment conditions. 4.1.3 Low-voltage control Control conductors in electrical penetration assembly with rated voltages less than or equal to 1,000V are defined as "low-voltage control conductors" and have the following rated values (see 4.2 and 4.3): a) Rated voltage; b) Rated continuous current; c) Rated short-time overload current and duration; d) Rated short-circuit current; e) Rated short-circuit heat capacity; f) Rated capacity under the most severe DBE environment conditions. 4.1.4 Instruments Coaxial, triaxial, biaxial and thermocouple conductors of instrument circuits are defined as "instrument conductors". The rated voltage of instrument conductor shall be specified according to the design service conditions. 4.1.5 Optical fiber Optical fiber has no definition of rated voltage or rated current. Optical fiber can be installed in the above four kinds of electrical penetration assemblies, among which instrument electrical penetration assemblies are preferred. Optical fiber shall have the following requirements:

Contents of GB/T 13538-2017

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and rated value 4.1 Classification 4.2 Rated value 4.3 Rated capacity under the most severe DBE environmental conditions 5 Design requirements 5.1 Mechanical design requirements 5.2 Requirements of electrical design 5.3 Requirements of flame retardant 5.4 Qualified life 6 Qualification 6.1 General 6.2 Design test 6.3 Qualified life test 6.4 Severe accident conditions 7 Product test 7.1 Gas leakage rate test 7.2 Pneumatic test 7.3 Dielectric strength test 7.4 Insulation resistance test 7.5 Conductor continuity and identification test 7.6 Partial discharge (corona) test 7.7 Optical fiber 8 Installation and field test 8.1 Installation and test standards 8.2 Installation procedure 8.3 Leakage rate test 8.4 Electrical test 8.5 Optical fiber test 9 Requirements for quality control and quality assurance 9.1 Materials, processes and personnel 9.2 Records 9.3 Nameplate 9.4 Design qualification document 9.5 Data and rated value 10 Requirements of purchaser's specification 10.1 General 10.2 Summary of recommendations for purchaser's specification 10.3 Data requirements and content guides of design specifications Annex A (Informative) Recommended value of parameters Annex B (Informative) Interface of electrical penetration assembly Annex C (Informative) Installation diagram of typical electrical penetration assembly Annex D (Informative) Thermal life test procedure Bibliography