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Analysis of Wall-Thinning Effects Caused by Power Uprates in the Secondary System of a Nuclear Power Plant

원전 2차계통의 출력증강 운전에 따른 배관감육 영향 분석

  • Received : 2016.02.12
  • Accepted : 2016.06.16
  • Published : 2016.06.30

Abstract

Piping and equipment are degraded by flow-accelerated corrosion (FAC) in nuclear power plants. FAC causes numerous problems and nuclear utilities maintain programs to control FAC. The key parameters influencing FAC are hydrodynamic conditions, water chemistry, and effect of materials. Recently, a nuclear utility has planned slight power uprates in Korea. Operating conditions need to be changed in the secondary system according to power uprates. This study analyzed the effect of wall-thinning caused by power uprates. The change of operation data in the secondary cycle is reviewed, and wall-thinning rates are analyzed in the main lines. As a result, two phase (mixture of water and steam) lines have a greater impact than a water line under power uprate conditions. Also, the quality of steam is the most important factor for FAC in two phase lines.

Keywords

References

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Cited by

  1. Analysis of Vibration Characteristics of Secondary Piping Faults in Testbed, Research, and Commercial Reactors vol.31, pp.6, 2016, https://doi.org/10.5050/ksnve.2021.31.6.675