Annual Meeting on Safety and Licensing of Research Reactors 28 Aug - PowerPoint PPT Presentation

Annual Meeting on Safety and Licensing of Research Reactors 28 Aug – 1 Sept. 2016 Ahmed Zakareia Egypt Amal Hasan Elgahwaji Libya Amany Mohammed Ahamed Sudan Amr Khaled Shabka Egypt Khaled Abd Eltawab Egypt Walid Dridi Tunisia 1

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PIE 10 MW reactor Subcritical Remarks (l) Loss of electrical power supplies: Loss of normal electrical Applicable Applicable power (2) Insertion of excess reactivity: Criticality during fuel Applicable Not applicable handling (due to an error in fuel insertion) Startup accident Applicable Not applicable Control rod failure or Applicable Not applicable control rod follower failure Control drive failure or Applicable Not applicable system failure 3

PIE 10 MW reactor Subcritical Remarks Failure of other reactivity Applicable Not applicable control devices (such as a moderator or reflector) Unbalanced rod positions Applicable Not applicable Failure or collapse of Applicable Not applicable structural components Insertion of cold water Applicable Not applicable Changes in the Applicable Not applicable moderator (e.g. voids or leakage of D2O into H2O systems) 4

PIE 10 MW reactor Subcritical Remarks Influence by experiments Applicable Not applicable and experimental devices (e.g. flooding or voiding, temperature effects, insertion of fissile material or removal of absorber material Insufficient shutdown Applicable Not applicable reactivity Inadvertent ejections of Applicable Not applicable control rods Maintenance errors with Applicable Not applicable reactivity devices Spurious control system Applicable Not applicable signals 5

PIE 10 MW reactor Subcritical Remarks (3) Loss of flow: Primary pump failure Applicable Not applicable Reduction in flow of Applicable Not applicable primary coolant (e.g. due to valve failure or a blockage in piping or a heat exchanger) Influence of the failure or Applicable Not applicable mishandling of an experiment Rupture of the primary Applicable Not applicable coolant boundary leading to a loss of flow Fuel channel blockage Applicable Not applicable 6

PIE 10 MW reactor Subcritical Remarks Improper power Applicable Not applicable distribution due, for example, to unbalanced rod positions in core experiments or fuel loading (power–flow mismatch) Reduction in coolant flow Applicable Not applicable due to bypassing of the core Deviation of system Applicable Not applicable pressure from the specified limits Loss of heat sink (e.g. Applicable Not applicable due to the failure of a valve or pump or a system rupture). 7

PIE 10 MW reactor Subcritical Remarks (4) Loss of coolant: Rupture of the primary Applicable Not applicable coolant boundary Damaged pool Applicable Not applicable Pump-down of the pool Applicable Not applicable Failure of beam tubes or Applicable Not applicable other penetrations 8

PIE 10 MW reactor Subcritical Remarks (5) Erroneous handling or failure of equipment or components: Failure of the cladding of Applicable Applicable a fuel element Mechanical damage to Applicable Applicable core or fuel (e.g. mishandling of fuel and dropping of a transfer flask onto the fuel) Failure of a emergency Applicable Not applicable cooling system Malfunction of the Applicable Not applicable reactor power control Criticality in fuel in Applicable Not applicable storage 9

PIE 10 MW reactor Subcritical Remarks Failure of means of Applicable Applicable confinement, including the ventilation system Loss of coolant to fuel Applicable Not applicable during transfer or storage Loss or reduction of Applicable Applicable proper shielding Failure of experimental Applicable Not applicable apparatus or material (e.g. loop rupture) Exceeding of fuel ratings Applicable Not applicable 10

PIE 10 MW reactor Subcritical Remarks (6) Special internal events: Internal fires or Applicable Applicable explosions Internal flooding Applicable Applicable Loss of support systems Applicable Applicable Security related incidents Applicable Applicable Malfunctions in reactor Applicable Applicable experiments Improper access by Applicable Applicable persons to restricted areas Fluid jets and pipe whip Applicable Applicable Exothermic chemical Applicable Applicable 11 reactions

PIE 10 MW reactor Subcritical Remarks (7) External events: Earthquakes (including Applicable Applicable seismically induced faulting and landslides) Flooding (including Applicable Applicable failure of an upstream dam and blockage of a river) Tornadoes and tornado Applicable Applicable missiles; Sandstorms Applicable Applicable Hurricanes, storms and Applicable Applicable lightning Tropical cyclones Applicable Applicable 12

PIE 10 MW reactor Subcritical Remarks Explosions Applicable Applicable Aircraft crashes Applicable Applicable Fires Applicable Applicable Toxic spills Applicable Applicable Accidents on transport Applicable Applicable routes Effects from adjacent Applicable Applicable facilities (e.g. nuclear facilities, chemical facilities and waste management facilities) Biological hazards such as Applicable Applicable microbial corrosion, structural damage or damage to equipment by 13 rodents or insects

PIE 10 MW reactor Subcritical Remarks Extreme meteorological Applicable Applicable phenomena Lightning strikes Applicable Applicable Power or voltage surges Applicable Applicable on the external supply line (8) Human errors Applicable Applicable 14