NB/T 11297-2023 in English
VALIDTechnical specifications for cleanliness of water and vapor loop in one-through steam generator nuclear power unit
- Issued on:2023-10-11
- Implemented on:2024-04-11
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$340.00
$330.00
$330.00
| Standard No: | NB/T 11297-2023 |
| Document status: | VALID |
| Title in English: | Technical specifications for cleanliness of water and vapor loop in one-through steam generator nuclear power unit |
| Title in Chinese: | 直流蒸发器核电机组水汽回路清洁控制技术要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2023-10-11 |
| Implemented on: | 2024-04-11 |
| ICS Classification: | 27.120.01-Nuclear energy in general |
| Professional Classification: | NB-Energy |
| Related Keywords: | nuclear power unit
nuclear power unit introduction standard framework one-through steam generator steam generator water vapor quality requirements |
| Related Topics: | water vapor
nuclear power nuclear power standards DC circuit safety water flow controller water flow controller nuclear power unit Wastewater evaporator cleaning price steam engine technology Clean steam generator nb/t 20526 |
本文件规定了直流蒸发器核电机组水汽回路清洁控制的总体要求、各阶段清洁控制措施、蒸发器吹扫、水汽回路化学清洗及整体冲洗的技术要求。
本文件适用于建设阶段的直流蒸发器核电机组。
Introduction
Standard Framework and Technology Evolution
As the first special standard for the cleanliness of the water vapor circuit of a DC evaporator nuclear power unit in my country, this specification fills the gap in the cleanliness control standard system during the nuclear power construction phase. The standard compilation integrates the dual technical logic of GB/T 12145 water vapor quality requirements and NB/T 20233 nuclear island equipment cleanliness requirements.
Definition of core terms
| Terms | Definition | Technical features |
|---|---|---|
| Direct current evaporator | A device in which supercooled water flows through the heating surface to complete heating, evaporation, and superheating to produce steam in one step | No steam-water separation device, high heat transfer efficiency |
| Water vapor circuit | Including a complete medium circulation channel from the condensate system to the main steam system | Composed of 9 key subsystems |
Full cycle cleaning control system
Manufacturing stage control
According to the requirements of JB/T 4058 and NB/T20001, implement the following for equipment such as high-voltage heater:
- Welding residue control (≤50mg/m²)
- Grease content detection (≤100mg/m²)
- Packaging sealing level (in line with JB/T 4711 Class B)
Comparison of key technical indicators
| Process stage | Control parameters | Conventional unit requirements | Requirements of this specification |
|---|---|---|---|
| Chemical cleaning | Iron content | ≤100μg/L | ≤50μg/L |
| Steam purge | Target plate trace | ≤0.8mm | ≤0.5mm |
Implementation suggestions
- Establish a cleanliness evaluation matrix based on DL/T 5764
- Use the staged pressure increase method (0.5MPa→2.5MPa step increase) when flushing the secondary side of the steam generator
- The selection of chemical cleaning agents should comply with the special requirements for austenitic steel protection in DL/T 794
Sample only — not a preview of NB/T 11297-2023
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