GB1501870A - Nuclear reactor fuel element sub-assemblies - Google Patents

Nuclear reactor fuel element sub-assemblies

Info

Publication number
GB1501870A
GB1501870A GB54760/74A GB5476074A GB1501870A GB 1501870 A GB1501870 A GB 1501870A GB 54760/74 A GB54760/74 A GB 54760/74A GB 5476074 A GB5476074 A GB 5476074A GB 1501870 A GB1501870 A GB 1501870A
Authority
GB
United Kingdom
Prior art keywords
fuel
grid
fuel pin
projections
waist
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB54760/74A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB54760/74A priority Critical patent/GB1501870A/en
Publication of GB1501870A publication Critical patent/GB1501870A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
    • 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)
  • Fuel Cell (AREA)

Abstract

1501870 Fuel elements UNITED KINGDOM ATOMIC ENERGY AUTHORITY 17 Nov 1975 [18 Dec 1974] 54760/74 Heading G6C In a fuel assembly comprising a bundle of fuel pins spaced apart by a series of cellular grids at intervals along the length of the bundle (Figs. la, 1b not shown), each fuel pin has a waist disposed at a common end region of the bundle and the cell-forming structure of corresponding cellular grid has resiliently yieldable projections extending radially into the cells to engage the waists of the fuel pins. In one embodiment, Fig. 2, the fuel pins 1 (only one shown) have lower end caps 9, and each end cap has a waist 10, a cylindrical land 11 and a tapered end region 12 providing a lead-in surface for the fuel pin 1 in the cellular grids 8 during assembly. The lowermost cellular grid 8 has three radial projections 13 engaging the waist 10 to hold the fuel pin 1 captive with the end cap 9 in end abutment with a lower grid member 6. The projections 13 consist of elongate embossments of rhomboid form arranged with the major -diagonals parallel to the longitudinal axes of the fuel pin and they have tapered end regions 14 to provide a lead-in surface for the fuel pin entering a cell. The waist 10 and grid 8 are dimensioned such that the fuel pin 1 remains captive by the embossments 13 when the relatively low (e.g. 3 lb.f.) levitation force of coolant flow is applied but the embossments deflect to release the fuel pin when an axial load of, say 7 lb.f., is applied to the fuel pin. In an alternative embodiment (Fig. 4, not shown), the projections consist of leaf-springs (15) disposed with their longitudinal axes parallel to the longitudinal axes of the fuel pins. -The springs comprise formed strips of resilient material and are housed in slots in the grid structure, the spring ends being welded to the ends of the slit. In another construction (not shown) the projections consist of leaf springs comprising formed strips stamped from the grid structure.
GB54760/74A 1975-11-17 1975-11-17 Nuclear reactor fuel element sub-assemblies Expired GB1501870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB54760/74A GB1501870A (en) 1975-11-17 1975-11-17 Nuclear reactor fuel element sub-assemblies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB54760/74A GB1501870A (en) 1975-11-17 1975-11-17 Nuclear reactor fuel element sub-assemblies

Publications (1)

Publication Number Publication Date
GB1501870A true GB1501870A (en) 1978-02-22

Family

ID=10471998

Family Applications (1)

Application Number Title Priority Date Filing Date
GB54760/74A Expired GB1501870A (en) 1975-11-17 1975-11-17 Nuclear reactor fuel element sub-assemblies

Country Status (1)

Country Link
GB (1) GB1501870A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426311A1 (en) * 1978-05-18 1979-12-14 Atomic Energy Authority Uk Fuel sub-assemblage for fast neutron nuclear reactor - has flexible reinforcement grids and lower retaining grid facilitating removal of wrapper for retreatment after irradiation
FR2495369A1 (en) * 1980-12-03 1982-06-04 Combustion Eng NUCLEAR FUEL ASSEMBLY
EP0249107A2 (en) * 1986-06-11 1987-12-16 Westinghouse Electric Corporation Nuclear-reactor fuel assembly having a plurality of spacer grids
US4818473A (en) * 1985-05-08 1989-04-04 Westinghouse Electric Corp. Fuel bundle
WO1992020069A1 (en) * 1991-04-29 1992-11-12 Siemens Aktiengesellschaft Fuel element for nuclear reactors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426311A1 (en) * 1978-05-18 1979-12-14 Atomic Energy Authority Uk Fuel sub-assemblage for fast neutron nuclear reactor - has flexible reinforcement grids and lower retaining grid facilitating removal of wrapper for retreatment after irradiation
FR2495369A1 (en) * 1980-12-03 1982-06-04 Combustion Eng NUCLEAR FUEL ASSEMBLY
US4818473A (en) * 1985-05-08 1989-04-04 Westinghouse Electric Corp. Fuel bundle
EP0249107A2 (en) * 1986-06-11 1987-12-16 Westinghouse Electric Corporation Nuclear-reactor fuel assembly having a plurality of spacer grids
EP0249107A3 (en) * 1986-06-11 1988-10-05 Westinghouse Electric Corporation Nuclear-reactor fuel assembly having a plurality of spacer grids
WO1992020069A1 (en) * 1991-04-29 1992-11-12 Siemens Aktiengesellschaft Fuel element for nuclear reactors

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee