HOME   Cart(0)   Quotation   About-Us Tax PDFs Standard-List Powered by Google www.ChineseStandard.net Database: 189760 (7 Dec 2024)

GB/T 40408-2021 PDF in English


GB/T 40408-2021 (GB/T40408-2021, GBT 40408-2021, GBT40408-2021)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB/T 40408-2021English170 Add to Cart 0-9 seconds. Auto-delivery. Nuclear grade isostatic graphite for high temperature gas-cooled reactor internals Valid
Standards related to (historical): GB/T 40408-2021
PDF Preview

GB/T 40408-2021: PDF in English (GBT 40408-2021)

GB/T 40408-2021 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.050 CCS Q 53 Nuclear grade isostatic graphite for high temperature gas- cooled reactor internals ISSUED ON: AUGUST 20, 2021 IMPLEMENTED ON: MARCH 01, 2022 Issued by: State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 5 4 Classification ... 5 5 Technical requirements ... 5 6 Test methods ... 7 7 Inspection rules ... 8 8 Packaging, marking, storage, transportation and quality instructions ... 9 Annex A (informative) Test methods for graphite Irradiation ... 10 Foreword This document was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents". This document was proposed by China Iron and Steel Association. This document shall be under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this document: Sinosteel New Materials (Zhejiang) Co., Ltd., Tsinghua University, Institute of Metallurgical Industry Information Standards. Main drafters of this document: Yang Hui, Sun Libin, Huang Dai, Wu Houzheng, Zheng Jingxu, Shi Li, Li He, Yang Xiaowu, Liu Tao, Xu Hanchun, Cao Shulin, Mao Yuzhen, Xu Jianping. Nuclear grade isostatic graphite for high temperature gas- cooled reactor internals 1 Scope This document specifies the classification, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality instructions of nuclear grade isostatic graphite used for reflector components of high temperature gas- cooled reactors. This document applies to nuclear grade isostatic graphite for high temperature gas- cooled reactor internals. 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 1431, The test method for compressive strength of carbon materials GB/T 3074.1, The test method for flexural strength of carbon materials GB/T 3074.2, Method for the determination of the elastic modulus of graphite electrodes GB/T 3074.4, Method for the determination of the coefficient of thermal expansion of graphite electrodes GB/T 8719, General rule for packing, marking, storage, transport and quality certificates of carbonaceous material and products GB/T 8721, The test method for tensile strength of carbon materials GB/T 8722, Test method for thermal conductivity of carbon materials GB/T 24528, Carbon materials - Determination method of the bulk density GB/T 38338, Test method for fracture toughness of carbon materials JY/T 0567, General rules of inductively coupled plasma emission spectroscopy analysis methods YB/T 5146, Determination of ash for high pure graphite products 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 nuclear grade isostatic graphite Graphite for nuclear industry that is manufactured from raw materials such as carbon aggregate and asphalt through grinding, kneading, isostatic pressing, roasting, impregnation, graphitization, purification and other process steps. NOTE: In the case of fast neutron (En≥0.1MeV) irradiation, this kind of graphite needs to consider the influence of size and material property changes on the design. It is mainly used for high temperature gas-cooled reactor reflector components. These components also perform the function of the core support structure. 3.2 isotropy; α The ratio of the thermal expansion coefficient in the molding gravity direction to the thermal expansion coefficient in the vertical molding gravity direction. 4 Classification According to the index of isotropy, nuclear grade isostatic graphite is divided into isotropic nuclear grade isostatic pressing graphite, nearly isotropic nuclear grade isostatic pressing graphite and anisotropic nuclear grade isostatic pressing graphite. 5 Technical requirements 5.1 Unirradiated basic indicators See Table 1 for the basic technical indicator requirements of nuclear grade isostatic graphite that are not irradiated. 6 Test methods 6.1 Bulk density According to the provisions of GB/T 24528. 6.2 Thermal conductivity According to the provisions of GB/T 8722. 6.3 Thermal expansion coefficient According to the provisions of GB/T 3074.4. 6.4 Isotropy Calculate according to . If , then calculate according to 6.5 Tensile strength According to the provisions of GB/T 8721. 6.6 Compressive strength According to the provisions of GB/T 1431. 6.7 Flexural strength According to the provisions of GB/T 3074.1. 6.8 Fracture toughness According to the provisions of GB/T 38338. 6.9 Elastic modulus According to the provisions of GB/T 3074.2. 6.10 Ash According to the provisions of YB/T 5146. 6.11 Boron equivalent According to the provisions of JY/T 0567, the impurity content of at least six elements Gd, B, Sm, Eu, Cd and Li shall be tested. The boron equivalent is calculated according to formula (1): Where, A - The boron equivalent; CGd - The content of Gd gadolinium element in the sample; CB - The content of B boron element in the sample; CSm - The content of Sm samarium element in the sample; CEu - The content of Eu europium element in the sample; CCd - The content of Cd cadmium element in the sample; CLi - The content of Li lithium element in the sample. NOTE: The coefficient before each content in the formula is the boron equivalent factor of the corresponding impurity element. 6.12 Test method for graphite irradiation Refer to Annex A for the test method for graphite irradiation. NOTE: Annex A is for reference only. 7 Inspection rules 7.1 Batching Each graphite block shall have a unique traceability number. The same designation of graphite in the same graphitization furnace is a batch. 7.2 Sampling When sampling for testing of tensile strength and compressive strength of graphite, the sampling quantity A specified in Table 2 shall be carried out. When sampling for testing of graphite thermal conductivity, thermal expansion coefficient, isotropy, graphite flexural strength, fracture toughness, graphite composition, it shall be carried out according to the sampling quantity B specified in Table 2. When sampling for testing of other characteristics, it shall be carried out according to the sampling quantity C specified in Table 2. When the testing sample is extracted, different positions of the graphite block shall be ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.