Critical heat flux concerns during the flow instability phase of a DEGB LOCA

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Arguments are presented that support the proposal that a separate burnout risk analysis, for the Flow Instability (FI) phase of a LOCA, not be required for reactor restart. With expected reactor power limits, flow instability will occur before critical heat flux (CHF). Since FI power limits preclude the occurrence of flow instability in a bounding accident, a DEGB LOCA, the risk of CHF and attendant burnout is negligible. A review of RDAP data revealed that in the past reactor assemblies operated at flow and power conditions similar to those expected in a LOCA without burnout occurring. This is strong bounding ... continued below

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Pages: (49 p)

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Shadday, M.A. Jr. August 1, 1990.

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Description

Arguments are presented that support the proposal that a separate burnout risk analysis, for the Flow Instability (FI) phase of a LOCA, not be required for reactor restart. With expected reactor power limits, flow instability will occur before critical heat flux (CHF). Since FI power limits preclude the occurrence of flow instability in a bounding accident, a DEGB LOCA, the risk of CHF and attendant burnout is negligible. A review of RDAP data revealed that in the past reactor assemblies operated at flow and power conditions similar to those expected in a LOCA without burnout occurring. This is strong bounding empirical evidence, without the scaling concerns of laboratory experiments. A bounding analysis of the influences of assembly non-idealities on CHF, power tilts, and channel eccentricity, is included. The margin between operating heat fluxes, during the postulated LOCA, and CHF was quantified by scoping calculations. Based on measured azimuthal power variations, the local heat flux would have to be more than 20 standard deviations above the calculated mean heat flux for CHF to occur.

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Pages: (49 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Other: DE92016473
  • Report No.: WSRC-TR-90-297
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/5037231 | External Link
  • Office of Scientific & Technical Information Report Number: 5037231
  • Archival Resource Key: ark:/67531/metadc1056526

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  • August 1, 1990

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:11 p.m.

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Shadday, M.A. Jr. Critical heat flux concerns during the flow instability phase of a DEGB LOCA, report, August 1, 1990; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc1056526/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.