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NB/T 20021-2010Construction Technology Specification for Concrete Raft Foundation of Nuclear Island of PWR Nuclear Power Plant (English PDF)

压水堆核电厂核岛混凝土筏形基础施工技术规程

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

May 1, 2010

Implementation date

October 1, 2010

Scope

NB/T 20021-2010 is the English-translated version of 压水堆核电厂核岛混凝土筏形基础施工技术规程.

NB/T 20021-2010 is the Chinese standard "Construction Technology Specification for Concrete Raft Foundation of Nuclear Island of PWR Nuclear Power Plant". Its scope clause reads: This standard specifies requirements for the construction and quality acceptance of concrete raft foundation of PWR power plant nuclear island.

This standard applies to the construction and quality acceptance of concrete raft foundation of PWR power plant nuclear island. Its clauses include terms and definitions.

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Document preview — NB/T 20021-2010

National Standard of the People's Republic of China

ICS: 27.120

Issued by: National Energy Administration of the People's Republic of China

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Basic requirements
5 Construction requirements
6 Concrete temperature control and monitoring
7 Acceptance of raft foundation
8 Quality documentation
Annex A (Informative) Method for quick test on chloride ion content in cement (fly ash) (semi-quantitative method)

1 Scope

This standard specifies requirements for the construction and quality acceptance of concrete raft foundation of PWR power plant nuclear island.

This standard applies to the construction and quality acceptance of concrete raft foundation of PWR power plant nuclear island.

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 175 Common portland cement

GB/T 1346 Test methods for water requirement of normal consistency, setting time and soundness of the portland cement

GB 1499 Hot rolled Ribbed steel bars for the reinforcement of concrete

GB/T 1596 Fly ash used for cement and concrete

GB/T 8074 Testing method for specific surface of cement—Blaine method

GB 8076 Concrete admixtures

GB/T 12959 Test methods for heat of hydration of cement

GB/T 14684 Sand for construction

GB/T 17671 Method of testing cements—Determination of strength

GB 50164 Standard for quality control of concrete

GB 50204 Code for acceptance of constructional quality of concrete structures

GBJ 107 Inspection and evaluation of concrete strength

JC/T 603 Standard test method for drying shrinkage of mortar

JGJ 52 Standard for technical requirements and test method of sand and crushed stone (or gravel) for ordinary concrete

JGJ 55 Specification for mix proportion design of ordinary concrete

JGJ 63 Standard of water for concrete

JGJ 107 General technical specification for mechanical splicing of bars

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1

raft foundation of nuclear island (henceforth “raft foundation”) mainly including the raft foundations of reactor building, fuel building, balance of plant, and connecting buildings, among others. The raft foundation of reactor building is round, while those of the other buildings are roughly rectangular. The raft foundations in all cases are of a cast-in-place reinforced concrete structure with a thickness of 3m to 6m

3.2 mass concrete

concrete with a structure size so large as to cause such a cracking in the structure due to the excessive temperature difference between the inside and outside of the concrete resulted from hydration heat of the cement that necessitates measures, e.g., for control of the temperature difference and the temperature drop rate, to reduce the tensile stress caused by the temperature difference inside the structure

3.3 type inspection

comprehensive inspection of the product carried out for type appraisal in trail production in the case of a new product or production transferred to another factory, and for assessment of product performance impact and product quality stability, in terms of all the technical requirements specified in the product standard, on a regular basis in the case of normal production

3.4

preliminary test of concrete mix proportion datum mix proportion obtained completely by laboratory work with the indexes satisfied with the design requirements, to provide recommended mix proportions appropriate for acceptance tests, or to investigate the effects of various parameters so as to suggest guidance and corrective measures when necessary in the future

3.5

feasibility test of concrete (henceforth “feasibility test”) a series of tests to verify whether the concrete mix proportion determined in the preliminary test meets the specified requirements under the site conditions

3.6

concrete construction mix proportion (henceforth “construction mix proportion”) mix proportion intended for construction practice, which is obtained through calculation according to the feedstock properties and the technical requirements of concrete, adjustment by laboratory trail, i.e., preliminary test, verification by feasibility test, and modification to reflect the measured moisture content of the aggregates

3.7 open qualification

concrete test to verify whether the performance indexes of the concrete mix proportion for initial use under certain working (environment) conditions, the workability and stability, among others, meet the specified requirements […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB 1499 · GB 1596 · GB 14684 · GBJ 107 · JC/T 603 · JGJ 55 · JGJ 52 · JGJ 63 · JGJ 107

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