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Title: Nuclear reactor melt arrest and coolability device

Abstract

Example embodiments provide a Basemat-Internal Melt Arrest and Coolability device (BiMAC) that offers improved spatial and mechanical characteristics for use in damage prevention and risk mitigation in accident scenarios. Example embodiments may include a BiMAC having an inclination of less than 10-degrees from the basemat floor and/or coolant channels of less than 4 inches in diameter, while maintaining minimum safety margins required by the Nuclear Regulatory Commission.

Inventors:
; ;
Publication Date:
Research Org.:
GE-HITACHI NUCLEAR ENERGY AMERICAS LLC, Wilmington, NC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1257211
Patent Number(s):
9,368,238
Application Number:
12/640,399
Assignee:
GE-HITACHI NUCLEAR ENERGY AMERICAS LLC (Wilmington, NC) IDO
DOE Contract Number:
FC07-07ID14778
Resource Type:
Patent
Resource Relation:
Patent File Date: 2009 Dec 17
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 22 GENERAL STUDIES OF NUCLEAR REACTORS

Citation Formats

Theofanous, Theo G., Dinh, Nam Truc, and Wachowiak, Richard M. Nuclear reactor melt arrest and coolability device. United States: N. p., 2016. Web.
Theofanous, Theo G., Dinh, Nam Truc, & Wachowiak, Richard M. Nuclear reactor melt arrest and coolability device. United States.
Theofanous, Theo G., Dinh, Nam Truc, and Wachowiak, Richard M. 2016. "Nuclear reactor melt arrest and coolability device". United States. doi:. https://www.osti.gov/servlets/purl/1257211.
@article{osti_1257211,
title = {Nuclear reactor melt arrest and coolability device},
author = {Theofanous, Theo G. and Dinh, Nam Truc and Wachowiak, Richard M.},
abstractNote = {Example embodiments provide a Basemat-Internal Melt Arrest and Coolability device (BiMAC) that offers improved spatial and mechanical characteristics for use in damage prevention and risk mitigation in accident scenarios. Example embodiments may include a BiMAC having an inclination of less than 10-degrees from the basemat floor and/or coolant channels of less than 4 inches in diameter, while maintaining minimum safety margins required by the Nuclear Regulatory Commission.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 6
}

Patent:

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  • A light water nuclear reactor melt-retention structure to mitigate the extent of direct containment heating of the reactor containment building. The structure includes a retention chamber for retaining molten core material away from the upper regions of the reactor containment building when a severe accident causes the bottom of the pressure vessel of the reactor to fail and discharge such molten material under high pressure through the reactor cavity into the retention chamber. In combination with the melt-retention chamber there is provided a passageway that includes molten core droplet deflector vanes and has gas vent means in its upper surface,more » which means are operable to deflect molten core droplets into the retention chamber while allowing high pressure steam and gases to be vented into the upper regions of the containment building. A plurality of platforms are mounted within the passageway and the melt-retention structure to direct the flow of molten core material and help retain it within the melt-retention chamber. In addition, ribs are mounted at spaced positions on the floor of the melt-retention chamber, and grid means are positioned at the entrance side of the retention chamber. The grid means develop gas back pressure that helps separate the molten core droplets from discharged high pressure steam and gases, thereby forcing the steam and gases to vent into the upper regions of the reactor containment building.« less
  • A method and arrangement are described for containing the core melt flowing from a nuclear reactor into a core catcher below the core wherein the core melt is permitted to gradually penetrate layers of a core catcher materials of inorganic reactor soluble oxides or salts disposed in the core catcher which core catcher materials are dissolved by the oxidic part of the core melt. The molten solution, after solidification and after being cooled down to a temperature at which hydrogen generating reactions do not take place, is leached with water and rinsed out of the core catcher without the needmore » for humans to be present in the reactor containment and to be exposed to radiation.« less
  • This patent describes a nuclear reactor melt-retention structure that functions to retain molten core material within a melt retention chamber to mitigate the extent of direct containment heating. The structure being adapted to be positioned within or adjacent to a pressurized or boiling water nuclear reactor containment building at a location such that at least a portion of the melt retention structure is lower than and to one side of the nuclear reactor pressure vessel, and such that the structure is adjacent to a gas escape channel means that communicates between the reactor cavity and the containment building of themore » reactor. It comprises a melt-retention chamber, wall means defining a passageway extending between the reactor cavity underneath the reactor pressure vessel and one side of the chamber, the passageway including vent means extending through an upper wall portion thereof. The vent means being in communication with the upper region of the reactor containment building, whereby gas and steam discharged from the reactor pressure vessel are vented through the passageway and vent means into the gas-escape channel means and the reactor containment building.« less