Development of the FACE Computer Code to Evaluate the Safety of an Air Ventilation System during a Postulated Solvent Fire in a Nuclear Fuel Reprocessing Plant

Nishio, Gunji; Yamazaki, Noboru

doi:10.13182/nt93-a34819

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The design of ventilation network is based on the node‐and‐branch method . A node is a point (no volume) or a simple zone (with a fixed volume) in the ventilation network, where the different physical quantities (pressure, temperature, particle, and gaseous species mass fractions...) are considered uniform.…”

Section: Simulations Of the Cfs 1 To 4 Tests Using The Two‐zone Modelmentioning

confidence: 99%

Horizontal cable tray fire in a well‐confined and mechanically ventilated enclosure using a two‐zone model

2019

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Summary Electrical cable trays are used in large quantities in nuclear power plants (NPPs) and are one of the main potential sources of fire. A malfunction of electrical equipment due to thermal stress for instance may lead to the loss of important safety functions of the NPPs. The investigation of such fires in a confined and mechanically ventilated enclosure has been scarce up to now and limited to nuclear industry. In the scope of the OECD PRISME‐2 project, the Institut de Radioprotection et de Sûreté Nucléaire (IRSN) conducted more than a dozen fire tests involving horizontal electrical cable trays burning either in open atmosphere or inside mechanically ventilated compartments to investigate this topic. A semi‐empirical model of horizontal cable tray fires in a well‐confined and mechanically ventilated enclosure was developed. This model is partly based on the approach used in FLASH‐CAT and on experimental findings from IRSN cables fire tests. It was implemented in the two‐zone model SYLVIA. The major features of the compartment fire experiments could then be reproduced with acceptable error, except for combustion of unburned gases. The development of such a semi‐empirical model is a common practice in fire safety engineering concerned with complex solid fuels.

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Section: Simulations Of the Cfs 1 To 4 Tests Using The Two‐zone Modelmentioning

confidence: 99%

Horizontal cable tray fire in a well‐confined and mechanically ventilated enclosure using a two‐zone model

2019

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“…The design of ventilation network is based on the node-and-branch method ( [6], [20]). A node is a point (no volume) or a simple zone (with a fixed volume) in the ventilation network, where the different physical quantities (pressure, temperature, density, particle or gas species concentration and mass fraction, etc.)…”

Section: Main Featuresmentioning

confidence: 99%

“…The SYLVIA software is able to model a comprehensive ventilation network of a nuclear facility by using the node/branch method (usually adopted by ventilation computer codes [6], [20]). This approach is based on the analogy of the ventilation network with an electrical one.…”

Section: Modeling Of the Ventilation Networkmentioning

confidence: 99%

Numerical method for determining water droplets size distributions of spray nozzles using a two-zone model

Plumecocq

Audouin

Joret

et al. 2017

Nuclear Engineering and Design

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The water spray systems is widely used for fire safety area and is a well-established technique for providing safety and protection of nuclear installations and also in industrial facilities. One major challenge is to be able to properly determine the technical features of the water spray system that are required for predictive simulations. For that, a Phase Doppler Interferometer (PDI) device, that is a complex and challenging laser technique, is often used to measure the droplet size distributions and the droplet velocities. However, some usual water spray models can require as input parameters only an overall droplet size distribution and an initial velocity and some statistical methods are needed to determine them from local accurate measurements. In this paper, it is addressed a new calibration approach for assessing the input parameters of this modeling by using large-scale and wellcontrolled fire tests. Then, by introducing some correlations to take into account different operating conditions of the pressure at the nozzle head, this technique is validated on other large-scale fire tests. After discussing thoroughly the results, this new method shows that it can be a valuable and efficient tool for determining the overall features of water spray systems linked with the modeling of water spray system used in this study.

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An expert system based on a Bayesian network for fire safety analysis in nuclear area

Chojnacki

Plumecocq

Audouin

2019

Fire Safety Journal

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Development of the FACE Computer Code to Evaluate the Safety of an Air Ventilation System during a Postulated Solvent Fire in a Nuclear Fuel Reprocessing Plant

Cited by 3 publications

References 4 publications

Horizontal cable tray fire in a well‐confined and mechanically ventilated enclosure using a two‐zone model

Horizontal cable tray fire in a well‐confined and mechanically ventilated enclosure using a two‐zone model

Numerical method for determining water droplets size distributions of spray nozzles using a two-zone model

An expert system based on a Bayesian network for fire safety analysis in nuclear area

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