Check patentability & draft patents in minutes with Patsnap Eureka AI!

Evaluation method for core water injection in nuclear power plants equipped with core traps

A technology of core capture and evaluation method, which is applied in the field of core water injection evaluation of nuclear power plants, can solve problems such as changes, and achieve the effects of avoiding steam explosions, improving severe accident management, and improving monitoring and status diagnosis

Active Publication Date: 2020-05-05
NUCLEAR POWER INSTITUTE OF CHINA
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relocation of core melt after a severe accident will cause changes in the neutron flux data outside the pressure vessel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Evaluation method for core water injection in nuclear power plants equipped with core traps
  • Evaluation method for core water injection in nuclear power plants equipped with core traps
  • Evaluation method for core water injection in nuclear power plants equipped with core traps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] A pressurized water reactor nuclear power plant is equipped with a crucible-type core trap specially for severe accidents. The power plant has arranged a large number of passive hydrogen recombiners in the containment for the threat of hydrogen in severe accidents. Therefore, the threat of hydrogen is not the main serious accident of the plant. The threat of accidents, the negative impact of hydrogen generation will not be considered in the analysis of core water injection countermeasures.

[0093] Similar to the scene of the Fukushima accident, after the tsunami, the entire plant was powered off, and the special safety facilities could not be activated. After the power outage, the power plant stopped unnecessary power consumption such as lighting, and the battery power was maintained for a long time. The main control room can still grasp the key points. Instrument monitoring data. After the core is exposed, it is monitored that the core outlet temperature exceeds 650°C...

Embodiment 2

[0106] The configuration of the power plant is roughly the same as that of Example 1. On the basis of Example 1, the design of the power plant has been improved for monitoring the temperature outside the pressure vessel. Several high-range thermocouples are installed in the insulation layer close to the outer wall of the pressure vessel. These thermocouples Evenly distributed at different angles in the circumferential direction of the pressure vessel, and thermocouples are arranged vertically from the height of the active section of the core to the bottom of the lower head, such as figure 1 , figure 2 shown. In terms of signal transmission, a temperature signal transmission channel is added on the basis of the original external nuclear test signal channel, and finally the main control room can monitor the temperature of the outer wall of the pressure vessel.

[0107] After the earthquake, a large breach accident occurred, the double ends of the main pipeline were sheared and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a core water injection evaluation method of a nuclear power plant equipped with a core catcher, comprising the following steps: S1, simplifying the core melting process in a pressure vessel into three stages; S2, combining the specific core melting process, The water injection evaluation method includes the following sub-steps: S21, monitoring the process of relocating the core melt in the pressure vessel, judging the state of the core melting according to the instrument monitoring data, and determining the core water injection countermeasures in combination with the specific core state analysis; S22, monitoring For the cooling effect of the core water injection, further adjust the core water injection countermeasures; S23, monitor the melt-through of the lower head of the pressure vessel, and stop the water injection; S24, monitor the scale and duration of the pressure vessel melt-through, and state implementation of core water injection. The beneficial effects of the invention are: providing different water injection countermeasures in different accident stages, controlling the water injection flow rate according to the cooling effect to avoid steam explosion, and rationally utilizing resources at the same time.

Description

technical field [0001] The invention relates to the technical field of severe accident management of nuclear power plants, in particular to a core water injection evaluation method of a nuclear power plant equipped with a core catcher. Background technique [0002] After a severe accident, the core is damaged, melted and relocated to the lower head of the pressure vessel. The core melt may melt through the lower head of the pressure vessel. The failure of the pressure vessel will lead to many adverse consequences, for example, it is difficult to maintain the core melt The continuous cooling of radioactive fission products diffuses completely into the containment vessel, threatening the integrity of the containment vessel, etc. Therefore, some advanced nuclear power plants set up a core trap under the pressure vessel, and the lower head of the pressure vessel melts and falls into the core trap to continue cooling the melt. [0003] Usually, water is injected into the core tr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/06G21C15/18G21C17/022G21D3/06
CPCG06Q10/0635G06Q50/06G21C15/182G21C17/022G21D3/06Y02A10/40Y02E30/00Y02E30/30
Inventor 孔翔程黄代顺邓坚向清安陈彬刘丽莉邹志强
Owner NUCLEAR POWER INSTITUTE OF CHINA
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com