Detail of NB/T 20341-2015

Introduction of NB/T 20341-2015

1 Scope This standard specifies composition and material performance requirements for the blocking structure of nuclear island buildings, caulking type of the building structure of nuclear island, type and performance requirements of the caulking material, and test methods and basic requirements of inspection and acceptance, among others, for the hole blocking materials and caulking materials in a PWR nuclear power plant (NPP). This standard is applicable to the inspection and acceptance of hole blocking materials and caulking materials for nuclear island buildings in a PWR NPP. 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 531 Rubber—Determination of indentation hardness by means of pocket hardness meters GB/T 1766 Paints and varnishes—Rating schemes of degradation of coats GB 8076 Concrete admixtures GB/T 9978.1-2008 Fire-resistance tests—Elements of building construction—Part 1: General requirements GB/T 13477-2002 Test method for building sealants GB/T 14683 Silicone sealants for building GB/T 16839.1 Thermocouples—Part 1: Reference tables GB 23864 Firestop material JC/T 482 Polyurethane sealant for building NB/T 20133.2-2012 Specifications for protective coatings used in pressurized water reactor nuclear power plants—Part 2: Standard test method for evaluating coatings at simulated design basis accident (DBA) conditions NB/T 20133.4-2012 Specifications for protective coatings used in pressurized water reactor nuclear power plants—Part 4: Determination of the decontaminability of coatings   3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 hole blocking function hole blocking function of airtightness, watertightness, fire resistance and radiation shielding, among others 3.2 hole blocking structure structure system that is composed of the penetrating items in the hole and a variety of blocking materials embedded in order to achieve the required hole blocking function, and is readily replaceable 3.3 modular sealing system sealing and blocking system composed of a metal frame embedded in a concrete wall or floor, module of polymer materials combined in the form of building block system, and metal hold-down fitting 3.4 joint gap retained or set up between two or more adjacent surfaces in the building structure of nuclear island For example: settlement joint, expansion joint, prefabricated joint, e.g. the gap between drainage ditch cover and drainage ditch wall, the gap formed by equipment or support base and concrete structure surface 3.5 joint caulking system system composed of a variety of materials embedded in the joint to meet the functional requirements of nuclear island building 3.6 backing material material that confine the sealing depth and back shape of the sealing material

Contents of NB/T 20341-2015

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Hole blocking 5 Caulking 6 Test methods 7 Inspection and acceptance 8 Labeling, packaging, transportation and storage Annex A (Normative) Test method for hole blocking materials Annex B (Normative) Test methods for caulking material