Standard No.:	GB/T 16702.8-2025
English Name:	Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants―Part 8：Low pressure or atmospheric storage tanks
Chinese Name:	压水堆核电厂核岛机械设备设计规范第8部分：低压或常压储罐
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-02-28
Implemented on:	2025-2-28
Status:	valid
Superseding:	GB/T 16702-2019 Design code for mechanical components in nuclear island of pressurized water reactor nuclear power plants
Target Language:	English
File Format:	PDF
Word Count:	26500 words
Translation Price(USD):	795.0
Delivery:	via email in 1~5 business day

GB/T 16702.8-2025 Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants―Part 8：Low pressure or atmospheric storage tanks English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. ICS 27.120. 20 CCS F 69 National Standards of the People's Republic of China GB/T 16702.8-2025 Partly replaces GB/T 16702-2019 Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants – Part 8: Low pressure or atmospheric storage tanks 压水堆核电厂核岛机械设备设计规范 第8部分：低压或常压储罐 (English Translation) Issue date: 2025⁃02⁃28 Implementation date: 2025⁃02⁃28 Issued by the State Administration for Market Regulation the Standardization Administration of the People's Republic of China Contents Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Symbol 5 Basic requirements 6 Materials 7 Design 8 Manufacturing and inspection 9 Test Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants - Part 8: Low pressure or atmospheric storage tanks 1 Scope This document specifies the requirements for materials, design, manufacturing and inspection of medium and low pressure or atmospheric pressure storage tanks in nuclear island machinery and equipment of PWR nuclear power plants, and describes relevant tests. This document is applicable to the design of low pressure or atmospheric pressure storage tanks and their parts specified in Clause 5 of GB/T 16702.1-2025. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions 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 16702.1-2025 Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants - Part 1: General principle GB/T 16702.3-2025 Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants - Part 3: Class 2 components GB/T 16702.4 Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants - Part 4: Class 3 components GB/T 16702.7 Design specification for mechanical components in nuclear island of pressurized water reactor nuclear power plants - Part 7： Supports GB/T 17505-2016 Steel and steel products - General technical delivery requirements NB/T 20001-2023 Fabrication rules for mechanical components of PWR nuclear island NB/T 20002.6 Welding rules for mechanical components of PWR nuclear islands -Part 6: Production welds NB/T 20003.2-2021 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 2: Ultrasonic testing NB/T 20003.3 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 3: Radiographic testing NB/T 20003.4 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 4: Penetrant testing NB/T 20003.5 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 5: Magnetic particle testing 3 Terms and definitions The terms and definitions defined in GB/T 16702.1-2025 and the following are applicable to this document. 3.1 low pressure storage tank equipment isolated from the external atmosphere inside and at low pressure without pressure-limiting safety device Note: A low-pressure storage tank is a storage tank with a top medium pressure lower than 0.05 MPa. 3.2 atmospheric storage tank equipment that maintains interior communication with the external atmospheric environment at all times 4 Symbols The following symbols apply to this document. A——The reinforcement cross-sectional area required for the opening. AC——The cross-sectional area of the connection area between the cylinder and the top cover, including the reinforcement cross-sectional area of the cylinder and the top cover. AT——the cross-sectional area of the cylinder at the analyzed location. A1——Reinforcement area exceeding the wall thickness of the storage tank. A2——Reinforcement area exceeding the wall thickness of the nozzle. D——The average diameter of the cylindrical tank wall. d——The inner diameter of the opening excluding the corrosion margin. E——the longitudinal elastic modulus of the material at the design temperature. F——the resultant force acting outside the cylinder at the position under consideration, excluding W. Note 1: If W, F and P forces act in the same direction, their positive and negative signs are the same. 5 Basic requirements 5.1 Scope of application of storage tanks Tanks that meet the following conditions shall comply with the provisions of this document: ——Vertical axisymmetric storage tank; ——Made of steel parts assembled and welded; ——placed on a rigid base; Note: The meaning of the term rigid means that this document does not apply to tanks installed on loose ground or simply covered with a concrete floor. Unless otherwise specified, the pressures listed in this document are gauge pressures. ——There is a fixed self-supporting top cover; ——The inner diameter is not more than 18m; ——Top medium pressure less than 0.05 MPa (0.5 bar) 5.2 Demarcation between tank and foundation 5.2.1 Flat bottom head tanks mounted directly on the foundation For the flat-bottomed head storage tank directly installed on the foundation, the boundary between the storage tank and the foundation is the supporting base surface between the storage tank and the foundation. 5.2.2 Tanks mounted on foundations by means of supports When the tank is connected to its foundation by means of a support, the boundary between the tank and the foundation is the bearing surface between the support and the foundation. Supports have the following structural forms: ——annular skirt; ——a bracket welded with the storage tank; ——Pillars directly connected to the storage tank. Supports shall comply with the requirements of GB/T 16702.7.