Development of a multi-unit seismic conditional core damage probability model with uncertainty analysis

2010 ◽

Author(s):

M. James Hardy ◽

Matthew F. King ◽

Ryan Bigelow

Keyword(s):

Air Temperature ◽

Temperature Rise ◽

Air Conditioning ◽

South Texas ◽

Balance Equations ◽

Damage Probability ◽

Core Damage ◽

Computational Fluid Dynamics Cfd ◽

Building Heat ◽

Simulation And Validation

The loss of air conditioning in the electrical auxiliary building at South Texas Project (STP) has been shown in previous work to result in relatively rapid air temperature rise. The heat up is a concern in the Probabilistic Risk Assessment (PRA) because it may be associated with high conditional core damage probability. As a consequence, operator responses to mitigate the building heat up have been developed and proceduralized at STP. The plant’s current loss of electrical auxiliary building HVAC operator procedure was analyzed and improvements have been recommended. This was done using a commercial computational fluid dynamics (CFD) package that modeled the transient air temperature rise of the building and qualitatively assessed the effectiveness of operator actions. A possible methodology for validating the CFD results was developed using coupled energy balance equations for individual rooms. The methodology is a conservative approach to compare the effectiveness operator actions and provide steps for future higher fidelity simulation and validation. While the specific approach is applicable to STP, the overall methods and approaches described should be applicable to other sites that may be subject to excessive room heat up due to loss of air conditioning in critical rooms.

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Uncertainty analysis of containment dose rate for core damage assessment in nuclear power plants

Nuclear Engineering and Technology ◽

10.1016/j.net.2018.02.004 ◽

2018 ◽

Vol 50 (5) ◽

pp. 673-682

Author(s):

Guohua Wu ◽

Jiejuan Tong ◽

Yan Gao ◽

Liguo Zhang ◽

Yunfei Zhao

Keyword(s):

Uncertainty Analysis ◽

Dose Rate ◽

Damage Assessment ◽

Nuclear Power ◽

Power Plants ◽

Nuclear Power Plants ◽

Core Damage

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Development of an optimal mitigation strategy by estimating the conditional core damage probability with time-dependent recovery actions

Annals of Nuclear Energy ◽

10.1016/j.anucene.2020.107381 ◽

2020 ◽

Vol 142 ◽

pp. 107381

Author(s):

In Seop Jeon ◽

Hyun Gook Kang

Keyword(s):

Mitigation Strategy ◽

Time Dependent ◽

Damage Probability ◽

Core Damage

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Study on the Kinetic Anti-Missile Fragment Based on NASA Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.271-272.584 ◽

2012 ◽

Vol 271-272 ◽

pp. 584-588 ◽

Cited By ~ 2

Author(s):

Wei Jie Wang ◽

Huai Rong Shen ◽

Yi Yong Li

Keyword(s):

Probability Model ◽

Ballistic Missile ◽

Minimum Mass ◽

Composite Outcome ◽

Damage Probability ◽

Debris Cloud ◽

Breakup Model ◽

The Impact

The question of the anti-missile fragment produced by the Kinetic Kill Vehicle (KKV) intercepting the Tactical Ballistic Missile (TBM) is studied. It turns out the anti-missile fragment are composite outcome of the impact and explosion. By analysis the National Aeronautics and Space Administration (NASA) impact breakup model is suggested to calculate the fragment charac-teristic. The minimum mass threshold of effective fragment is deduced; the damages probability model that the debris cloud impacts the cooperative target is established based on Poisson distribu-tion. The simulation case indicates that the damage probability can achieve the 10-3 magnitude, and should attach importance to this threat.

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Best Attack Position Model for BVR Multi-Target Air Combat

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1016.511 ◽

2014 ◽

Vol 1016 ◽

pp. 511-515

Author(s):

Rong Yang ◽

Fang Ming Huang ◽

Hua Jun Gong

Keyword(s):

Probability Distributions ◽

Probability Model ◽

Target Distance ◽

Fourth Generation ◽

Simulation Data ◽

Damage Probability ◽

Air Combat ◽

Attack Path ◽

Heading Angle

Refer to the characteristics of BVR air combat and multi-target attack for the Fourth Generation Fighters, this paper constructs and computes the model of probability distributions in multi-target kill zone, the model of the best attack path/attack position of multi-target attack. The model of probability distributions in multi-target kill zone considers heading angle and approaching angle of target, distance between fighter and target, maximum off-boresight launching angle and killing angle. The model of the best attack path/attack position considers damage probability to targets by missiles, threat degree to fighter of targets, and threat degree to fighter of residual targets. The paper calculates the simulation data according to the models, analyzes probability distributions in multi-target kill zone of missiles, the best attack path/attack position. The models and simulated results show that the method, which uses kill zone probability model, can improve the damage probability and reduce threat degree from enemy targets.

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