Investigation of Minimum Film boiling Phenomena on Fuel Rods Under Blowdown Cooling Conditions

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Blowdon cooling heat transfer is an important process that occurs early in a hypothetical large break loss-of-coolant accident (LOCA) in a pressurized water reactor. During blowdown, the flow through the hot assembly is a post-critical heat flux dispersed droplet flow. The heat transfer mechanisms that occur in blowdown cooling are complex and depend on droplet and heated surface interaction. In a safety analysis, it is of considerable importance to determine the thermal-hydraulic conditions leading to the minimum film boiling temperature, Tmin. A flow boiling rig for measurement of blowdown cooling heat transfer and quench phenomena on a nuclear fuel rod ... continued below

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Bajorek, Stephen M.; Gawron, Michael; Etzel, Timothy & Peterson, Lucas June 30, 2003.

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Description

Blowdon cooling heat transfer is an important process that occurs early in a hypothetical large break loss-of-coolant accident (LOCA) in a pressurized water reactor. During blowdown, the flow through the hot assembly is a post-critical heat flux dispersed droplet flow. The heat transfer mechanisms that occur in blowdown cooling are complex and depend on droplet and heated surface interaction. In a safety analysis, it is of considerable importance to determine the thermal-hydraulic conditions leading to the minimum film boiling temperature, Tmin. A flow boiling rig for measurement of blowdown cooling heat transfer and quench phenomena on a nuclear fuel rod simulator was designed and constructed for operation at up to 12.4 MPa. The test section consisted of a concentric annulus, with a 9.5 mm OD nuclear fuel rod simulator at the center. The rod was contained within a 0.85 mm thick, 19 mm OD 316 stainless steel tube, forming the flow channel. Two types of rods were tested; one type was sheathed with Inconel 600 while the other was clad with Zircaloy-2. Water was injected into the test section at the top of the heated length through an injection header. This header was an annular sign that fit around the fuel rod simulator and within the stainless steel tube. Small spacers aligned the injection header and prevented contract with either the heater rod or the tube. A series of small diameter holes at the bottom of the header caused the formation of droplets that became entrained with the steam flow. The test section design was such that quench would take place on the rod, and not along the channel outer annulus.

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OSTI as DE00812202

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  • Other Information: PBD: 30 Jun 2003

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  • Report No.: DOE/ID/13780
  • Grant Number: FG07-99ID13780
  • DOI: 10.2172/812202 | External Link
  • Office of Scientific & Technical Information Report Number: 812202
  • Archival Resource Key: ark:/67531/metadc735731

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 30, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • Jan. 3, 2017, 6:53 p.m.

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Bajorek, Stephen M.; Gawron, Michael; Etzel, Timothy & Peterson, Lucas. Investigation of Minimum Film boiling Phenomena on Fuel Rods Under Blowdown Cooling Conditions, report, June 30, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc735731/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.