Safety Assessment of Nuclear Power Plants for Liquefaction Consequences

Katona, Tamás János; Bán, Zoltán; Győri, Erzsébet; Tóth, László; Mahler, András

doi:10.1155/2015/727291

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…If the hazard could not be neglected, the consequences of liquefaction should be thoroughly analysed, and the plant safety should be justified. Paks NPP in Hungary is an example of this case; see Katona et al [16,17].…”

Section: Introductionmentioning

confidence: 99%

Applicability of Pseudoprobabilistic Method of Liquefaction Hazard Assessment for Nuclear Power Plants at Diffuse Seismicity Sites

Katona

Győri

Tóth³

2019

Science and Technology of Nuclear Installations

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For the new nuclear power plants, the hazard of liquefaction due to earthquakes should be excluded by appropriate site selection or eliminated by engineering measures. An important question is how to define a quantitative criterion for negligibility of the liquefaction hazard. In the case of operating plants, liquefaction can be revealed as a beyond-design-basis event. It is important to learn whether the liquefaction hazard has a safety relevance and whether there is a sufficient margin to the onset of liquefaction. The use of pseudoprobabilistic method would be practicable for the definition of probability of liquefaction, but it could result in overconservative results. In this paper, the applicability of the pseudoprobabilistic procedure is demonstrated for the sites in diffuse seismicity environment and for low hazard levels that are typical for nuclear safety considerations. Use of the procedure is demonstrated in a case study with realistic site-plant parameters.

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Section: Introductionmentioning

confidence: 99%

Applicability of Pseudoprobabilistic Method of Liquefaction Hazard Assessment for Nuclear Power Plants at Diffuse Seismicity Sites

Katona

Győri

Tóth³

2019

Science and Technology of Nuclear Installations

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“…Among the commonly used cyclic stress-based methods, the CPT-based method of Boulanger and Idriss is deemed to be the most accurate and most realistic. On one hand, SPT testing has no tradition in Hungary and contractors has no practice in performing them, hence the results often turned out to be erroneous as it was also pointed out by Katona et al [9]. On the other hand, independent comparison of CPT-based methods by Green et al [10] showed that the procedure proposed by Idriss and Boulanger [11] -which was updated in 2014results in the lowest error index for the case histories that were analyzed from the Canterbury Earthquake Sequence, New Zealand.…”

Section: Back-analysis Of Dunaharaszti Earthquake Peak Ground Accelerationmentioning

confidence: 99%

Characterization and Liquefaction Hazard Assessment of Two Hungarian Liquefied Sites from the 1956 Dunaharaszti Earthquake

Bán¹,

Győri²,

Tóth³

et al. 2020

Period. Polytech. Civil Eng.

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The seismicity of Hungary can be considered moderately active, nevertheless contemporary reports from the past approx. 350 years documented surface manifestations of liquefaction occurrences. The last such earthquake was the 1956 Dunaharaszti ground motion, for which the location of two liquefied sites could be identified approx. 60 years after the event. This provided an excellent opportunity to analyze possibly the only accessible liquefied sites in Hungary. Analysis of the two sites included field and laboratory tests allowing the back-calculation of maximum horizontal ground acceleration of the earthquake. This parameter was previously unknown because the closest seismometer saturated during the event. The performed back-analysis using the principles of paleoliquefaction studies was the first of such analyses in the country. In areas with low to moderate seismicity, geotechnical engineers often neglect and overlook liquefaction hazard, however, when it is addressed, the hazard is often overestimated due to improper characterization of the seismic loading and site characterization. To explore this observation more deeply, probabilistic seismic and liquefaction hazard assessment were carried out at the two liquefied sites and it was found that this conclusion is also valid for Hungary, but the degree of conservatism of the pseudo-probabilistic procedures decreases with increasing earthquake return period (lower annual probability of occurrence).

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“…For the evaluation of the consequences of differential settlement, useful experiences have been gained from the linear and non-linear analysis performed for the case of liquefaction for Nuclear Power Plant Paks, Hungary [29]. Although the physical phenomena of liquefaction and PGD is differing, the differential settlement in both cases cause similar static demand on the structure.…”

Section: Studies Contributing To Understanding the Case Of Plant Resp...mentioning

confidence: 99%

Safety of Nuclear Power Plants with Respect to the Fault Displacement Hazard

Katona

2020

Applied Sciences

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The hazard of permanent ground displacements/deformations can challenge the safety of the nuclear power plants. Increasing knowledge of the hazard and development of methods for structure–fault–displacement interaction motivates the designing of nuclear power plants for permanent ground displacement instead of abandoning the sites that could be affected by this kind of hazard. For the design basis, permanent ground displacement should be defined at the hazard level that complies with the probabilistic criteria for accounting for the natural hazards in the design that also ensure compliance with probabilistic safety criteria. In this paper, a procedure is proposed for the definition of the design basis permanent ground displacement that is based on the deaggregation of seismic design basis hazard. The definition of the displacement for the margin evaluation is also proposed. The feasibility of safe design is also demonstrated for the proposed definition of design basis hazard via qualitative judgement on the sensitivity of the structures, systems and components ensuring the fundamental safety functions with respect to the permanent ground displacement that is supported by existing case studies.

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Safety Assessment of Nuclear Power Plants for Liquefaction Consequences

Cited by 7 publications

References 18 publications

Applicability of Pseudoprobabilistic Method of Liquefaction Hazard Assessment for Nuclear Power Plants at Diffuse Seismicity Sites

Applicability of Pseudoprobabilistic Method of Liquefaction Hazard Assessment for Nuclear Power Plants at Diffuse Seismicity Sites

Characterization and Liquefaction Hazard Assessment of Two Hungarian Liquefied Sites from the 1956 Dunaharaszti Earthquake

Safety of Nuclear Power Plants with Respect to the Fault Displacement Hazard

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