Evaluation of the thermal strain of an NPP containment structure during leakage rate tests

Wang, Xuguang; Huang, Xu; Kwon, Oh‐Sung; Bentz, Evan C.; Tcherner, Julia; DeMerchant, M.M.; Moland, Mark

doi:10.1016/j.engstruct.2019.109761

Cited by 3 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The radiation reflected from one surface to another in close proximity is called reflected radiation (G R ). So, the total amount of solar radiation received by objects on the Earth's surface is [17]…”

Section: Solar Radiation Modelmentioning

confidence: 99%

“…Based on the previous discussion on solar light projection and its variation with location and surface direction, researchers have developed detailed models to describe the process from an intensity perspective. Solar angle information can be obtained from weather station websites, such as the United States Naval Observatory (USNO) website [17]. The intensity of solar radiation, I d , is calculated using the empirical model developed.…”

Section: Solar Radiation Modelmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Uncertainty Reduction Algorithm Based on Temperature Distribution Prior for Optical Sensors in Oil Tank Ground Settlement Monitoring

Liu,

Jiang,

Liu

et al. 2024

Sensors

View full text Add to dashboard Cite

Ground settlement (GS) in an oil tank determines its structural integrity and commercial service. However, GS monitoring faces challenges, particularly due to the significant temperature differences induced by solar radiation around the tank in daytime. To address this problem, this paper digs out a prior and proposes a temperature uncertainty reduction algorithm based on that. This prior has a spatial Gaussian distribution of temperature around the tank, and numerical simulation and practical tests are conducted to demonstrate it. In addition, combining uniformly packaged sensor probes and the spatial prior of temperature, the temperature uncertainty is verified to be Gaussian-distributed too. Then, the overall temperature uncertainty can be captured by Gaussian fitting and then removed. The practical test verified a 91% reduction rate in temperature uncertainty, and this approach enables GS sensors to effectively perform daytime monitoring by mitigating temperature-related uncertainties.

show abstract

Section: Solar Radiation Modelmentioning

confidence: 99%

Section: Solar Radiation Modelmentioning

confidence: 99%

Temperature Uncertainty Reduction Algorithm Based on Temperature Distribution Prior for Optical Sensors in Oil Tank Ground Settlement Monitoring

Liu,

Jiang,

Liu

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

Evaluation of the Structural Response of the Containment Structure of a NPP to Internal Pressure and Thermal Gradients

Pinto,

Ceballos,

Estrada

et al. 2024

Procedia Structural Integrity

View full text Add to dashboard Cite

Vibration Monitoring of Nuclear Power Plant Containment Buildings During the Integrated Leakage Rate Test for Structural Condition Assessment

Eiras¹,

Payan²,

Rakotonarivo³

et al. 2022

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems

View full text Add to dashboard Cite

This study investigates the use of the operational vibrations produced during the Integrated Leak Rate Test of nuclear power plant containment buildings for further informing on its mechanical condition. The experiment is performed on a 1:3-scale containment building mock-up. The results show that meaningful vibrations were generated during the pressurization test. Different features were extracted from the vibration signals and analyzed as a function of the internal pressure. Experimental modal analysis was performed and demonstrated that several frequency peaks generated during the pressurization cycle effectively corresponded to the eigenmodes of the containment building. The identified operational frequency modes exhibited remarkable hysteretic dependencies on the internal pressure. The latter was phenomenologically described through a simplified 2D Finite Element Model of the vessel. Besides, a surrogate statistical model based on the Principal Component Analysis of the vibration data was proposed as a baseline and so detect abnormal behavior. Then, different synthetic damage scenarios were created by subtlety altering the recorded signals and ultimately substantiate the capability of the statistical model to detect these odd signals. Finally, conclusions were drawn regarding the possibility of using mechanical vibrations for assisting in the licensing process of nuclear power plants and monitor the structural health condition of in-service containment buildings.

show abstract

Evaluation of the thermal strain of an NPP containment structure during leakage rate tests

Cited by 3 publications

References 11 publications

Temperature Uncertainty Reduction Algorithm Based on Temperature Distribution Prior for Optical Sensors in Oil Tank Ground Settlement Monitoring

Temperature Uncertainty Reduction Algorithm Based on Temperature Distribution Prior for Optical Sensors in Oil Tank Ground Settlement Monitoring

Evaluation of the Structural Response of the Containment Structure of a NPP to Internal Pressure and Thermal Gradients

Vibration Monitoring of Nuclear Power Plant Containment Buildings During the Integrated Leakage Rate Test for Structural Condition Assessment

Contact Info

Product

Resources

About