GB1029712A - Improvements in or relating to nuclear reactors - Google Patents

Improvements in or relating to nuclear reactors

Info

Publication number
GB1029712A
GB1029712A GB5624/64A GB562464A GB1029712A GB 1029712 A GB1029712 A GB 1029712A GB 5624/64 A GB5624/64 A GB 5624/64A GB 562464 A GB562464 A GB 562464A GB 1029712 A GB1029712 A GB 1029712A
Authority
GB
United Kingdom
Prior art keywords
moderator
core
fuel
zones
control
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
GB5624/64A
Inventor
Charles Peter Gratton
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 GB5624/64A priority Critical patent/GB1029712A/en
Priority to FR5074A priority patent/FR1427298A/en
Priority to BE659606A priority patent/BE659606A/xx
Publication of GB1029712A publication Critical patent/GB1029712A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C1/00—Reactor types
    • G21C1/32—Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core
    • G21C1/322—Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core wherein the heat exchanger is disposed above the core
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C1/00—Reactor types
    • G21C1/04—Thermal reactors ; Epithermal reactors
    • G21C1/06—Heterogeneous reactors, i.e. in which fuel and moderator are separated
    • G21C1/08—Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being highly pressurised, e.g. boiling water reactor, integral super-heat reactor, pressurised water reactor
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/005—Flux flattening
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/02—Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/26—Control of nuclear reaction by displacement of the moderator or parts thereof by changing the moderator concentration
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C9/00—Emergency protection arrangements structurally associated with the reactor, e.g. safety valves provided with pressure equalisation devices
    • G21C9/02—Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse; Control elements having arrangements activated in an emergency
    • 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

Abstract

1,029,712. Reactors. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. Feb. 11, 1965 [Feb. 11, 1964], No. 5624/64. Heading G6C. A nuclear reactor core has fuel-containing zones including fissile material and moderator to form a critical assembly having an epithermal neutron spectrum, and fuel-free zones bounded by absorbing material of predominantly thermal captive characteristics; provision is made for introducing moderator into the fuel-free zones so as to thermalize neutrons in these zones so that they are then absorbed by the absorbing material. The reactor is preferably water cooled and moderated, although the moderator may be solid graphite rods, particles or a slurry and the coolant a gas. Both shut-down and power control are effected by varying the level of moderator in the fuel-free zones or various parts of the zones, and this control may be supplemented by the inclusion of burnable poisons. Liquid moderator may be introduced from above or below the core. The reactor is stated to be particularly suitable for marine propulsion. The reactor (Fig. 5) comprises a core 51, heat exchangers 52 and a control system 63, 66, 70. The core comprises (Fig. 1, plan view) fuel assemblies 5, comprising vertical fuel plates, arranged in groups of four to define square fuelfree zones 6 which are lined by square section tubes of neutron absorber, such as boron-steel, or a cadmium alloy. Water coolant is circulated by three pumps 57 as indicated by the arrows. Immediately surrounding the core is a moderator container 56 which is intended to keep the core totally immersed in the event of a major leakage in the coolant system. A thermal shield 54 is also provided. Operation and control.-In the shutdown condition, all the moderator control channels 66 are filled with water via conduit 68a, 68b, 69; thus fast neutrons, which would normally pass through the empty channels, are moderated to thermal neutrons and consequently absorbed by the preferential absorbing material of the tubes. At full power, all water in the control channels is displaced by gas supplied through conduits 70 in tunnel 63; thus no moderation takes place of fast neutrons passing through the control channels. The control channels are divided into annular zones so that different levels of moderator may be induced throughout the core for optimizing flux distribution and start-up techniques. It is preferred to use the central region for fine control and the intermediate and outer regions for shut-down. The fuel preferably comprises 80% Pu 239, 16% Pu 240 and 4% Pu 241.
GB5624/64A 1964-02-11 1964-02-11 Improvements in or relating to nuclear reactors Expired GB1029712A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB5624/64A GB1029712A (en) 1964-02-11 1964-02-11 Improvements in or relating to nuclear reactors
FR5074A FR1427298A (en) 1964-02-11 1965-02-10 Nuclear reactor
BE659606A BE659606A (en) 1964-02-11 1965-02-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5624/64A GB1029712A (en) 1964-02-11 1964-02-11 Improvements in or relating to nuclear reactors

Publications (1)

Publication Number Publication Date
GB1029712A true GB1029712A (en) 1966-05-18

Family

ID=26240028

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5624/64A Expired GB1029712A (en) 1964-02-11 1964-02-11 Improvements in or relating to nuclear reactors

Country Status (3)

Country Link
BE (1) BE659606A (en)
FR (1) FR1427298A (en)
GB (1) GB1029712A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4657726A (en) * 1984-06-22 1987-04-14 Westinghouse Electric Corp. Moderator control apparatus for a nuclear reactor fuel assembly
US4693862A (en) * 1984-07-02 1987-09-15 Westinghouse Electric Corp. Gas displacement spectral shift reactor and control method
US4728480A (en) * 1985-02-12 1988-03-01 Westinghouse Electric Corp. Apparatus and method for refurbishing a spectral shift mechanism for a nuclear reactor fuel assembly
GB2588259A (en) * 2020-03-27 2021-04-21 Rolls Royce Plc Reactor control device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1081214A (en) * 1965-03-09 1967-08-31 Hitachi Ltd Control system for fast reactors

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4657726A (en) * 1984-06-22 1987-04-14 Westinghouse Electric Corp. Moderator control apparatus for a nuclear reactor fuel assembly
US4693862A (en) * 1984-07-02 1987-09-15 Westinghouse Electric Corp. Gas displacement spectral shift reactor and control method
US4728480A (en) * 1985-02-12 1988-03-01 Westinghouse Electric Corp. Apparatus and method for refurbishing a spectral shift mechanism for a nuclear reactor fuel assembly
GB2588259A (en) * 2020-03-27 2021-04-21 Rolls Royce Plc Reactor control device
GB2588259B (en) * 2020-03-27 2022-06-08 Rolls Royce Plc Reactor control device

Also Published As

Publication number Publication date
BE659606A (en) 1965-08-11
FR1427298A (en) 1966-02-04

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