Impact of wind velocity on the performance of the RVACS decay heat removal system

Tzanos, CP

dc.contributor.author	Tzanos, CP	en
dc.date.accessioned	2014-03-01T01:45:57Z
dc.date.available	2014-03-01T01:45:57Z
dc.date.issued	1997	en
dc.identifier.issn	00295450	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24807
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0031209416&partnerID=40&md5=cb278dda3aae26aa2a6837f87f565c12	en
dc.subject	Decay heat removal	en
dc.subject	Passive safety systems	en
dc.subject	Wind effects	en
dc.subject.other	Cooling systems	en
dc.subject.other	Flow patterns	en
dc.subject.other	Natural convection	en
dc.subject.other	Pressure effects	en
dc.subject.other	Thermal effects	en
dc.subject.other	Wind effects	en
dc.subject.other	Decay heat removal system	en
dc.subject.other	Passive safety systems	en
dc.subject.other	Reactor vessel auxiliary cooling system (RVACS)	en
dc.subject.other	Liquid metal cooled reactors	en
dc.title	Impact of wind velocity on the performance of the RVACS decay heat removal system	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	The impact of wind velocity on the performance of the reactor vessel auxiliary cooling system (RVACS) of an advanced liquid-metal reactor design is analyzed, and design modifications that mitigate adverse wind effects are investigated. In the reference design, the reactor is served by four communicating RVACS stacks, and each stack has two air inlets. In this two-inlet stack design, winds blowing in a direction 90 deg from the axis formed by the two stack inlets result in pressure distributions around the stacks that drastically change the desired airflow pattern in the RVACS. This leads to significantly elevated RVACS air temperatures and significant azimuthal guard vessel temperature variations. For example, a 27 m/s (60 mph) wind leads to an air temperature at the exit of the RVACS heated section that is ∼ 115°C higher than that under no-wind conditions. The addition of two more inlets per stack, one inlet per stack side, significantly improves RVACS performance. The air temperature at the exit of the heated RVACS section is significantly reduced below that of the two-inlet design, and this temperature decreases as the wind speed increases. An increase in wind speed from 3 to 27 m/s leads to an air temperature change from 186 to 165°C. The azimuthal temperature variation is also improved. At the top of the guard vessel, this variation is reduced from 62.5 to 8.5° C at the low wind speed of 3 m/s and from 85.0 to 30.5°C at the high wind speed of 27 m/s.	en
heal.journalName	Nuclear Technology	en
dc.identifier.volume	119	en
dc.identifier.issue	1	en
dc.identifier.spage	1	en
dc.identifier.epage	10	en