Safety cases for design-basis accidents in LWRs featuring passive systems

2021 ◽  
pp. 111095
Author(s):  
Thomas Mull ◽  
Thomas Wagner ◽  
Giuseppe Bonfigli ◽  
Sebastian Buchholz ◽  
Frank Schäfer ◽  
...  
Keyword(s):  
Passive Systems ◽  
Design Basis ◽  
Safety Cases

Safety cases for design-basis accidents in LWRs featuring passive systems Part 2 – Numerical investigations

2021 ◽  
Vol 372 ◽  
pp. 110996
Author(s):  
Giuseppe Bonfigli ◽  
Sebastian Buchholz ◽  
Frank Schäfer ◽  
Nadine Kaczmarkiewicz ◽  
Christoph Schuster ◽  
...  
Keyword(s):  
Passive Systems ◽  
Numerical Investigations ◽  
Design Basis ◽  
Safety Cases

Ensuring Integrity and Functional Capacity of the Containment Under Beyond Design Basis Accident in the Design of New Generation NPP With WWER-1000

2002 ◽  
Author(s):  
V. M. Berkovich ◽  
A. B. Malyshev ◽  
G. S. Taranov ◽  
A. K. Podshybyakin ◽  
A. M. Shumsky
Keyword(s):  
Functional Capacity ◽  
Passive Systems ◽  
Design Basis ◽  
Design Basis Accident ◽  
New Generation ◽  
Containment Integrity

A method for provision of containment integrity and localizing capability of the new generation NPPs with WWER reactor units under the beyond design accidents is discussed. The aim is achieved by equipment of NPPs by additional passive systems.

Use of Monopulse Difference-Phase Direction Finding Method for Location of Air Targets in Active-Passive Systems with Noise-Like Signal

2005 ◽  
Vol 63 (10) ◽  
pp. 863-869 ◽  
Author(s):  
Ye. N. Belov ◽  
Ye. M. Zarichnyak ◽  
V. I. Lutsenko ◽  
I. V. Lutsenko ◽  
V. G. Yakovlev
Keyword(s):  
Direction Finding ◽  
Passive Systems ◽  
Phase Direction ◽  
Finding Method

scholarly journals Non-linear damping for scattering-passive systems in the Maxwell class

2020 ◽  
Vol 53 (2) ◽  
pp. 7458-7465
Author(s):  
Shantanu Singh ◽  
George Weiss ◽  
Marius Tucsnak
Keyword(s):  
Passive Systems ◽  
Non Linear ◽  
Linear Damping

scholarly journals Passive Solar Solutions for Buildings: Criteria and Guidelines for a Synergistic Design

2021 ◽  
Vol 11 (1) ◽  
pp. 376
Author(s):  
Giacomo Cillari ◽  
Fabio Fantozzi ◽  
Alessandro Franco
Keyword(s):  
Energy Demand ◽  
Theoretical Background ◽  
Environmental Benefits ◽  
Passive Systems ◽  
Extrinsic Factors ◽  
Solar Systems ◽  
Final Performance ◽  
Passive Solar ◽  
Energy Simulations

Passive solar system design is an essential asset in a zero-energy building perspective to reduce heating, cooling, lighting, and ventilation loads. The integration of passive systems in building leads to a reduction of plant operation with considerable environmental benefits. The design can be related to intrinsic and extrinsic factors that influence the final performance in a synergistic way. The aim of this paper is to provide a comprehensive view of the elements that influence passive solar systems by means of an analysis of the theoretical background and the synergistic design of various solutions available. The paper quantifies the potential impact of influencing factors on the final performance and then investigates a case study of an existing public building, analyzing the effects of the integration of different passive systems through energy simulations. General investigation has highlighted that latitude and orientation impact energy saving on average by 3–13 and 6–11 percentage points, respectively. The case study showed that almost 20% of the building energy demand can be saved by means of passive solar systems. A higher contribution is given by mixing direct and indirect solutions, as half of the heating and around 25% of the cooling energy demand can be cut off.

scholarly journals Classification of Consumer Goods Safety Cases Based on Improved Bayesian Model

2020 ◽  
Vol 1574 ◽  
pp. 012157
Author(s):  
Yingcheng Xu ◽  
Wei Feng ◽  
Fei Pei ◽  
Haiyan Wang
Keyword(s):  
Consumer Goods ◽  
Bayesian Model ◽  
Safety Cases

scholarly journals The SPES3 Facility for Testing an Integral Layout SMR: BDBE Simulation Analysis

2011 ◽  
Author(s):  
Roberta Ferri ◽  
Andrea Achilli ◽  
Cinzia Congiu ◽  
Gustavo Cattadori ◽  
Fosco Bianchi ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Nuclear Fission ◽  
Sensitivity Analyses ◽  
Medium Size ◽  
Design Calculation ◽  
Pressurized Water ◽  
Pressure Equalization ◽  
Plant Safety ◽  
Design Basis ◽  
Safety Features

The SPES3 facility is being built at the SIET laboratories, in the frame of an R&D program on Nuclear Fission, led by ENEA and funded by the Italian Ministry of Economic Development. The facility is based on the IRIS reactor design, an advanced medium size, integral layout, pressurized water reactor, based on the proven technology of PWR with an innovative configuration and safety features suitable to cope with Loss of Coolant Accidents through a dynamic coupling of the primary and containment systems. SPES3 is suitable to test the plant response to postulated Design and Beyond Design Basis Events, providing experimental data for code validation and plant safety analysis. It reproduces the primary, secondary and containment systems of the reactor with 1:100 volume scale, full elevation, prototypical fluid and thermal-hydraulic conditions. A design-calculation feedback process, based on the comparison between IRIS and SPES3 simulations, performed respectively by FER, with GOTHIC and RELAP5 coupled codes, and by SIET, with RELAP5 code, led to reduce the differences in the two plants behaviour, versus a 2-inch equivalent DVI line DEG break, considered the most challenging LOCA for the IRIS plant. Once available the final design of SPES3, further calculations were performed to investigate Beyond Design Basis Events, where the intervention of the Passive Containment Condenser is fundamental for the accident recovery. Sensitivity analyses showed the importance of the PCC actuation time, to limit the containment pressure, to reach an early pressure equalization between the primary and containment systems and to allow passive water transfer from the containment to the RPV, enhanced by the ADS Stage-II opening.

scholarly journals Computational Fluid Dynamics Modeling of Steam Condensation on Nuclear Containment Wall Surfaces Based on Semiempirical Generalized Correlations

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Pavan K. Sharma ◽  
B. Gera ◽  
R. K. Singh ◽  
K. K. Vaze
Keyword(s):  
Nuclear Power ◽  
Nuclear Reactor ◽  
Pressure Rise ◽  
Dynamics Modeling ◽  
Steam Condensation ◽  
Noncondensable Gases ◽  
Nuclear Containment ◽  
Design Basis ◽  
Lumped Parameter ◽  
Transport Calculation

In water-cooled nuclear power reactors, significant quantities of steam and hydrogen could be produced within the primary containment following the postulated design basis accidents (DBA) or beyond design basis accidents (BDBA). For accurate calculation of the temperature/pressure rise and hydrogen transport calculation in nuclear reactor containment due to such scenarios, wall condensation heat transfer coefficient (HTC) is used. In the present work, the adaptation of a commercial CFD code with the implementation of models for steam condensation on wall surfaces in presence of noncondensable gases is explained. Steam condensation has been modeled using the empirical average HTC, which was originally developed to be used for “lumped-parameter” (volume-averaged) modeling of steam condensation in the presence of noncondensable gases. The present paper suggests a generalized HTC based on curve fitting of most of the reported semiempirical condensation models, which are valid for specific wall conditions. The present methodology has been validated against limited reported experimental data from the COPAIN experimental facility. This is the first step towards the CFD-based generalized analysis procedure for condensation modeling applicable for containment wall surfaces that is being evolved further for specific wall surfaces within the multicompartment containment atmosphere.

Reliability Prediction of Passive Systems with Multiple Degradation Measures

2011 ◽  
Vol 173 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Luciano Burgazzi
Keyword(s):  
Reliability Prediction ◽  
Passive Systems
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