FR2290741A1 - Reactor bottom entry control rod with emergency hydraulic drive - by hollow piston has rolling contact between piston and surrounding tube - Google Patents

Reactor bottom entry control rod with emergency hydraulic drive - by hollow piston has rolling contact between piston and surrounding tube

Info

Publication number
FR2290741A1
FR2290741A1 FR7532605A FR7532605A FR2290741A1 FR 2290741 A1 FR2290741 A1 FR 2290741A1 FR 7532605 A FR7532605 A FR 7532605A FR 7532605 A FR7532605 A FR 7532605A FR 2290741 A1 FR2290741 A1 FR 2290741A1
Authority
FR
France
Prior art keywords
control rod
hollow piston
piston
nut
spindle
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.)
Withdrawn
Application number
FR7532605A
Other languages
French (fr)
Inventor
Ake Berglund
Antti Suvanto
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.)
Westinghouse Electric Sweden AB
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
Publication of FR2290741A1 publication Critical patent/FR2290741A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G21C7/08—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 by displacement of solid control elements, e.g. control rods
    • G21C7/12—Means for moving control elements to desired position
    • G21C7/14—Mechanical drive arrangements
    • 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
    • G21C7/08—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 by displacement of solid control elements, e.g. control rods
    • G21C7/12—Means for moving control elements to desired position
    • 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)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

An insertion device for a bottom-entry control rod of a nuclear reactor comprises a mechanical spindle-nut drive and a hydraulic drive for rapid run-in of the control rod; in normal operation in the spindle rotates with its threaded portion in a non-rotating threaded nut, while in emergency rod insertion a hollow piston, which surrounds both the threaded spindle and also the nut and normally rests on the top of the nut, is hydraulically driven upwards to run the control rod into the reactor core; the hollow piston is permanently connected to the control rod by a coupling. A guide tube surrounds the spindle, the nut and the hollow piston and has a seal at its top end, through which the piston passes. The bottom end of the hollow piston has a non-return ratchet device, which is normally non-effective during mechanical operation but comes into action when hydraulic operation is used and prevents the piston from falling back again after it has been driven upwards to drive the control rod into the core. The seal between the upper end of the guide tube and the hollow piston is constituted as a labyrinth seal consisting of a number of annular grooves on the inner, cylindrical face of the guide tube; contactless movement between this cylindrical face and the outer face of the hollow piston is ensured by a number of guide rollers each mounted on a horizontal shaft and housed in a recess inside the cylindrical surface of the guide tube and bearing against the outer face of the hollow piston. Pref. these guide rollers are of a hard metal. The rolling contact of the guide rollers is used as a substitute for the more commonly used sealing rings and graphite sealing bearing. The new arrangement is much more reliable, less subject to wear and unlikely to adversely affect the operation of the control rod.
FR7532605A 1974-11-08 1975-10-24 Reactor bottom entry control rod with emergency hydraulic drive - by hollow piston has rolling contact between piston and surrounding tube Withdrawn FR2290741A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7414036A SE386531B (en) 1974-11-08 1974-11-08 REACTOR STEERING WHEEL WITH STEERING WHEEL STORED PISTON

Publications (1)

Publication Number Publication Date
FR2290741A1 true FR2290741A1 (en) 1976-06-04

Family

ID=20322650

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7532605A Withdrawn FR2290741A1 (en) 1974-11-08 1975-10-24 Reactor bottom entry control rod with emergency hydraulic drive - by hollow piston has rolling contact between piston and surrounding tube

Country Status (5)

Country Link
JP (1) JPS5169789A (en)
DE (1) DE2547919B2 (en)
FI (1) FI753101A (en)
FR (1) FR2290741A1 (en)
SE (1) SE386531B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496193A1 (en) * 1980-12-16 1982-06-18 Westinghouse Electric Corp MECHANISM FOR LATCHING AND TRANSLATION OF BARS

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521370A (en) * 1982-07-08 1985-06-04 General Electric Company Control of nuclear reactors
US4518559A (en) * 1982-07-08 1985-05-21 General Electric Company Control of nuclear reactors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496193A1 (en) * 1980-12-16 1982-06-18 Westinghouse Electric Corp MECHANISM FOR LATCHING AND TRANSLATION OF BARS

Also Published As

Publication number Publication date
JPS5169789A (en) 1976-06-16
SE386531B (en) 1976-08-09
SE7414036L (en) 1976-05-10
DE2547919A1 (en) 1976-05-13
FI753101A (en) 1976-05-09
DE2547919B2 (en) 1979-05-23

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Legal Events

Date Code Title Description
RE Withdrawal of published application