SE9402293D0 - Reduction of a reactor tank's neutron dose - Google Patents

Reduction of a reactor tank's neutron dose

Info

Publication number
SE9402293D0
SE9402293D0 SE9402293A SE9402293A SE9402293D0 SE 9402293 D0 SE9402293 D0 SE 9402293D0 SE 9402293 A SE9402293 A SE 9402293A SE 9402293 A SE9402293 A SE 9402293A SE 9402293 D0 SE9402293 D0 SE 9402293D0
Authority
SE
Sweden
Prior art keywords
fuel
channels
sub
water
reactor
Prior art date
Application number
SE9402293A
Other languages
Swedish (sv)
Other versions
SE9402293L (en
SE505976C2 (en
Inventor
Olov Nylund
Original Assignee
Asea Atom Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asea Atom Ab filed Critical Asea Atom Ab
Priority to SE9402293A priority Critical patent/SE505976C2/en
Publication of SE9402293D0 publication Critical patent/SE9402293D0/en
Priority to PCT/SE1995/000709 priority patent/WO1996000966A1/en
Publication of SE9402293L publication Critical patent/SE9402293L/en
Publication of SE505976C2 publication Critical patent/SE505976C2/en

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C11/00—Shielding structurally associated with the reactor
    • G21C11/06—Reflecting shields, i.e. for minimising loss of neutrons
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/322—Means to influence the coolant flow through or around the bundles
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
    • G21C3/328—Relative disposition of the elements in the bundle lattice
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C5/00—Moderator or core structure; Selection of materials for use as moderator
    • G21C5/02—Details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Abstract

A method for reducing the proportion of fast neutrons leaking out of a reactor core in a boiling water reactor. The reactor core comprises a plurality of fuel assemblies and is surrounded by a reactor vessel. Water flows upwards through the fuel assemblies and part of the water is thereby transformed into steam. A fuel assembly comprises a number of vertical channel-formed parts, so-called sub-channels (9g, 9h), to accommodate fuel bundles (15g). A fuel bundle comprises a plurality of fuel rods arranged between a bottom tie plate and a top tie plate. Openings (26a, 26b) are provided between adjacent sub-channels such that water and steam may flow between the sub-channels. The method comprises removing, in a plurality of those fuel assemblies which are located furthest out in the core, closest to the reactor vessel, one or more fuel bundles from sub-channels which are facing the reactor vessel, and replacing them with one or more devices (16h) for improving the neutron moderation in the upper portion of the fuel assembly. Such a device comprises means (17) for restricting the water flow in the upper portion of a sub-channel, and means (27) for blocking, downstream of the means for restriction, the openings (26b) between adjacent sub-channels.
SE9402293A 1994-06-29 1994-06-29 Method, apparatus and carrier cartridge for reducing the neutron dose of a reactor tank SE505976C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9402293A SE505976C2 (en) 1994-06-29 1994-06-29 Method, apparatus and carrier cartridge for reducing the neutron dose of a reactor tank
PCT/SE1995/000709 WO1996000966A1 (en) 1994-06-29 1995-06-13 Reduction of the neutron dose of a reactor vessel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9402293A SE505976C2 (en) 1994-06-29 1994-06-29 Method, apparatus and carrier cartridge for reducing the neutron dose of a reactor tank

Publications (3)

Publication Number Publication Date
SE9402293D0 true SE9402293D0 (en) 1994-06-29
SE9402293L SE9402293L (en) 1995-12-30
SE505976C2 SE505976C2 (en) 1997-10-27

Family

ID=20394565

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9402293A SE505976C2 (en) 1994-06-29 1994-06-29 Method, apparatus and carrier cartridge for reducing the neutron dose of a reactor tank

Country Status (2)

Country Link
SE (1) SE505976C2 (en)
WO (1) WO1996000966A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9431135B2 (en) * 2013-12-17 2016-08-30 Global Nuclear Fuel—Americas, LLC Nuclear reactor fluence reduction systems and methods

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576785A (en) * 1983-06-14 1986-03-18 Carolina Power And Light Company Reduction in rate of radiation exposure to excore nuclear reactor components
JP2914778B2 (en) * 1991-05-20 1999-07-05 株式会社東芝 Boiling water reactor

Also Published As

Publication number Publication date
SE9402293L (en) 1995-12-30
WO1996000966A1 (en) 1996-01-11
SE505976C2 (en) 1997-10-27

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