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Risk Management, Risk Engineering and Nuclear safety

DEMJANČUKOVÁ, K. Risk Management, Risk Engineering and Nuclear safety. Plzeň, 2012.
Jazyk publikace: eng
Anglický název: Risk Management, Risk Engineering and Nuclear safety
Rok vydání: 2012
Autoři: Ing. Kateřina Demjančuková
Abstrakt EN: When solving the safety problem of nuclear power plants (NPPs), various extreme effects have to be involved even if they are highly improbable. Earthquake is one of the effects that can affect NPPs and has to be considered to ensure nuclear safety. The limiting condition for the emergency core cooling system (ECCS) requirements is provided by the double-ended-guillotine break (DEGB) criterion of the largest primary piping system in the NPP. The ability of the coolant to remove heat from the fuel is lost - even small losses of fluid may have important consequences. US NRC reached the conclusion that the rupture of primary circuit pipeline with a 850 mm diameter is improbable. Expert elicitation method determined the transition break size (TBS) for PWR within the range of 305 – 356 mm (for the pipelines connected to the main circulation loop) [8]. The question that followed was how the TBS could be influenced by the seismic event. If we succeed to demonstrate the probability less than 10-5 than we will conclude that the influence of large LOCA by a seismic event doesn’t exist. The purpose of this paper is to present the methodology [3] of seismic hazard assessment and to discuss problems and difficulties of the seismic hazard assessment of particular locality. An example will be demonstrated by seismic hazard assessment of Pilsen city.
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