Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept

This work presents a thermohydraulic analysis of a postulated accident involving the rupture of the breeder primary cooling loop inside a heat exchanger (once through steam generator). After the detection of the loss of pressure inside the primary loop, a plasma shutdown is actuated with a consequen...

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Autores principales:	Francesco Galleni, Marigrazia Moscardini, Andrea Pucciarelli, Maria Teresa Porfiri, Nicola Forgione
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	WCLL-BB MELCOR PHTS safety analysis DEMO Technology T
Acceso en línea:	https://doaj.org/article/c6f04c9b7114440d9f24ae04dd3a91b9
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spelling	oai:doaj.org-article:c6f04c9b7114440d9f24ae04dd3a91b92021-11-11T15:45:04ZNumerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept10.3390/en142169161996-1073https://doaj.org/article/c6f04c9b7114440d9f24ae04dd3a91b92021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/6916https://doaj.org/toc/1996-1073This work presents a thermohydraulic analysis of a postulated accident involving the rupture of the breeder primary cooling loop inside a heat exchanger (once through steam generator). After the detection of the loss of pressure inside the primary loop, a plasma shutdown is actuated with a consequent plasma disruption, isolation of the secondary loop, and shutoff of the pumps in the primary; no other safety counteractions are postulated. The objective of the work is to analyze the pressurization of the primary and secondary sides to show that the accidental overpressure in the two sides of the steam generators is safely accommodated. Furthermore, the effect of the plasma disruption on the FW, in terms of temperatures, should be analyzed. Lastly, the time transients of the pressures and temperatures in the HX and BB for a time span of up to 36 h should be obtained to assess the effect of the decay heat over a long period. A full nodalization of the OTSG was realized together with a simplified nodalization of the whole PHTS BB loop. The code utilized was MELCOR for fusion version 1.8.6. The accident was simulated by activating a flow path which directly connected one section of the primary with the parallel section of the secondary side. It is shown here that the pressures and the temperatures inside the whole PHTS system remain below the safety thresholds for the whole transient.Francesco GalleniMarigrazia MoscardiniAndrea PucciarelliMaria Teresa PorfiriNicola ForgioneMDPI AGarticleWCLL-BBMELCORPHTSsafety analysisDEMOTechnologyTENEnergies, Vol 14, Iss 6916, p 6916 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	WCLL-BB MELCOR PHTS safety analysis DEMO Technology T
spellingShingle	WCLL-BB MELCOR PHTS safety analysis DEMO Technology T Francesco Galleni Marigrazia Moscardini Andrea Pucciarelli Maria Teresa Porfiri Nicola Forgione Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept
description	This work presents a thermohydraulic analysis of a postulated accident involving the rupture of the breeder primary cooling loop inside a heat exchanger (once through steam generator). After the detection of the loss of pressure inside the primary loop, a plasma shutdown is actuated with a consequent plasma disruption, isolation of the secondary loop, and shutoff of the pumps in the primary; no other safety counteractions are postulated. The objective of the work is to analyze the pressurization of the primary and secondary sides to show that the accidental overpressure in the two sides of the steam generators is safely accommodated. Furthermore, the effect of the plasma disruption on the FW, in terms of temperatures, should be analyzed. Lastly, the time transients of the pressures and temperatures in the HX and BB for a time span of up to 36 h should be obtained to assess the effect of the decay heat over a long period. A full nodalization of the OTSG was realized together with a simplified nodalization of the whole PHTS BB loop. The code utilized was MELCOR for fusion version 1.8.6. The accident was simulated by activating a flow path which directly connected one section of the primary with the parallel section of the secondary side. It is shown here that the pressures and the temperatures inside the whole PHTS system remain below the safety thresholds for the whole transient.
format	article
author	Francesco Galleni Marigrazia Moscardini Andrea Pucciarelli Maria Teresa Porfiri Nicola Forgione
author_facet	Francesco Galleni Marigrazia Moscardini Andrea Pucciarelli Maria Teresa Porfiri Nicola Forgione
author_sort	Francesco Galleni
title	Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept
title_short	Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept
title_full	Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept
title_fullStr	Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept
title_full_unstemmed	Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept
title_sort	numerical simulation of an out-vessel loss of coolant from the breeder primary loop due to large rupture of tubes in a primary heat exchanger in the demo wcll concept
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c6f04c9b7114440d9f24ae04dd3a91b9
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Numerical Simulation of an Out-Vessel Loss of Coolant from the Breeder Primary Loop Due to Large Rupture of Tubes in a Primary Heat Exchanger in the DEMO WCLL Concept

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