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Fire Risks in Using Paraffin as Neutron Radiation Shielding Material

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Title: Fire Risks in Using Paraffin as Neutron Radiation Shielding Material
Authors: Madsen, Dan, Jörud, Fredrik, van Hees, Patrick, Husted, Bjarne Paulsen
Contributors: Lund University, Faculty of Engineering, LTH, Departments at LTH, Department of Building and Environmental Technology, Division of Fire Safety Engineering, Lunds universitet, Lunds Tekniska Högskola, Institutioner vid LTH, Institutionen för bygg- och miljöteknologi, Avdelningen för Brandteknik, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Aerosols, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Aerosoler, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Circular Building Sector, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Cirkulär byggindustri, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: The Energy Transition, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Energiomställningen, Originator
Source: Fire and Materials. 49(6):951-959
Subject Terms: Engineering and Technology, Civil Engineering, Building Technologies, Teknik, Samhällsbyggnadsteknik, Husbyggnad, Other Civil Engineering, Annan samhällsbyggnadsteknik
Description: Safety in general and fire safety in particular are key concerns in neutron-based research facilities, and the choice of the material that is used to stop neutron radiation is critical in this respect. Borated paraffin has been used at existing research facilities and could potentially be used at new facilities. However, a literature search resulted in very little information about the fire properties of borated paraffin. This was the motivation for the study discussed in this article. Two types of fire tests were performed. The Cone Calorimeter was used to obtain heat release rate characteristics of regular paraffin and borated paraffin. The results from standard Cone Calorimeter tests on specimens in the horizontal orientation show that borated paraffin with 4.5% boron has a heat release rate per unit area that is a factor of 3–5 lower than regular paraffin. The second type of test involved exposure of a small mock-up of a section of a hollow steel wall filled with borated paraffin exposed on one side to the standard ISO 834 temperature–time curve. During the first 20 min of the test, the borated paraffin in contact with the steel plate on the exposed side melted. Pressure from boiling water in the resulting cavity was relieved by pushing the molten paraffin to the unexposed side, where it exited through cracks in the unexposed surface of the wall section. The test confirmed the hypothesis of pressure release by molten paraffin.
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  Data: Fire Risks in Using Paraffin as Neutron Radiation Shielding Material
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  Data: <searchLink fieldCode="AR" term="%22Madsen%2C+Dan%22">Madsen, Dan</searchLink><br /><searchLink fieldCode="AR" term="%22Jörud%2C+Fredrik%22">Jörud, Fredrik</searchLink><br /><searchLink fieldCode="AR" term="%22van+Hees%2C+Patrick%22">van Hees, Patrick</searchLink><br /><searchLink fieldCode="AR" term="%22Husted%2C+Bjarne+Paulsen%22">Husted, Bjarne Paulsen</searchLink>
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  Data: Lund University, Faculty of Engineering, LTH, Departments at LTH, Department of Building and Environmental Technology, Division of Fire Safety Engineering, Lunds universitet, Lunds Tekniska Högskola, Institutioner vid LTH, Institutionen för bygg- och miljöteknologi, Avdelningen för Brandteknik, Originator<br />Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Aerosols, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Aerosoler, Originator<br />Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Circular Building Sector, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Cirkulär byggindustri, Originator<br />Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: The Energy Transition, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Energiomställningen, Originator
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  Data: <i>Fire and Materials</i>. 49(6):951-959
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  Data: Safety in general and fire safety in particular are key concerns in neutron-based research facilities, and the choice of the material that is used to stop neutron radiation is critical in this respect. Borated paraffin has been used at existing research facilities and could potentially be used at new facilities. However, a literature search resulted in very little information about the fire properties of borated paraffin. This was the motivation for the study discussed in this article. Two types of fire tests were performed. The Cone Calorimeter was used to obtain heat release rate characteristics of regular paraffin and borated paraffin. The results from standard Cone Calorimeter tests on specimens in the horizontal orientation show that borated paraffin with 4.5% boron has a heat release rate per unit area that is a factor of 3–5 lower than regular paraffin. The second type of test involved exposure of a small mock-up of a section of a hollow steel wall filled with borated paraffin exposed on one side to the standard ISO 834 temperature–time curve. During the first 20 min of the test, the borated paraffin in contact with the steel plate on the exposed side melted. Pressure from boiling water in the resulting cavity was relieved by pushing the molten paraffin to the unexposed side, where it exited through cracks in the unexposed surface of the wall section. The test confirmed the hypothesis of pressure release by molten paraffin.
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