Canadian Patents Database / Patent 2766591 Summary

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(12) Patent Application: (11) CA 2766591
(54) English Title: RETUBE PLATFORM FOR NUCLEAR REACTOR
(54) French Title: PLATE-FORME DE REMPLACEMENT DES TUBES D'UN REACTEUR NUCLEAIRE
(51) International Patent Classification (IPC):
  • G21C 21/00 (2006.01)
  • E04G 1/15 (2006.01)
  • G21C 17/017 (2006.01)
(72) Inventors (Country):
  • BRIGGS, MICHAEL ALEXANDER (Canada)
  • MORIKAWA, DAVID (Canada)
  • GHANAVI, REZA (Canada)
(73) Owners (Country):
  • ATOMIC ENERGY OF CANADA LIMITED (Canada)
(71) Applicants (Country):
  • ATOMIC ENERGY OF CANADA LIMITED (Canada)
(74) Agent: NORTON ROSE FULBRIGHT CANADA LLP/S.E.N.C.R.L., S.R.L.
(45) Issued:
(22) Filed Date: 2012-01-16
(41) Open to Public Inspection: 2012-07-15
Examination requested: 2016-10-20
(30) Availability of licence: N/A
(30) Language of filing: English

(30) Application Priority Data:
Application No. Country Date
61/433,215 United States of America 2011-01-15

English Abstract




A retube platform system for installation in a reactor vault adjacent an end
face of a CANDU
reactor core during a retube process. The retube platform system includes a
plurality of columns,
a platform, and an elevator system. Each of the plurality of columns is
supported on at least one
floor surface of the vault. The platform includes a frame and a decking
surface secured to the
frame to provide a working surface for personnel and retube tooling. The
platform includes a
front end adjacent the end face and a rear end remote from the end face. The
elevator system is
provided between the plurality of columns and the platform and is configured
to move the
platform with a vertical travel substantially equal to a height of the end
face.


Note: Claims are shown in the official language in which they were submitted.



CLAIMS

1. A retube platform system for installation in a reactor vault adjacent an
end face of a
CANDU reactor core during a retube process, the retube platform system
comprising:

a plurality of columns, each of the plurality of columns being supported on at
least one
floor surface of the vault;

a platform including a frame and a decking surface secured to the frame to
provide a
working surface for personnel and retube tooling, the platform including a
front end adjacent the
end face and a rear end remote from the end face; and

an elevator system provided between the plurality of columns and the platform
and
configured to move the platform with a vertical travel substantially equal to
a height of the end
face.

2. The retube platform system of claim 1, further comprising a perimeter
railing assembly
provided around a majority portion of a perimeter of the platform, the
perimeter railing assembly
including a laterally-sliding opening and a plurality of cables.

3. The retube platform system of claim 1, wherein the platform includes at
least one
vertically-telescoping side platform.

4. The retube platform system of claim 1, wherein the platform includes a
removable front
extension assembly.

5. The retube platform system of claim 1, wherein the elevator system includes
a servo
motor at a top end of each of the plurality of columns.

6. The retube platform system of claim 5, wherein the elevator system includes
a ball-screw
jack driven by each servo motor, and a controller configured to actuate all of
the servo motors
synchronously to move the platform vertically.

7. The retube platform system of claim 1, further comprising a flexible cable
track for
housing a plurality of electrical cables at the rear end of the platform.


18



8. The retube platform system of claim 1, further comprising at least one
linear bearing rail
provided on the decking surface.

9. The retube platform system of claim 8, wherein the at least one linear
bearing rail
includes two linear bearing rails spanning substantially across a width of the
platform.
10. The retube platform system of claim 8, further comprising at least one
rack gear
positioned adjacent the at least one linear bearing rail.

11. The retube platform system of claim 1, further comprising at least one
radiation shielding
wall forming a shielded walk-off area remote from the front end of the
platform.

12. The retube platform system of claim 1, wherein the plurality of columns
are also braced
to at least one adjacent vault wall.

13. The retube platform system of claim 1, wherein a portion of the decking
surface is
movably coupled to the frame to form a selectively openable hatch therein.

14. The retube platform system of claim 13, wherein a servo motor is coupled
to the portion
of the decking surface and operable to open and close the hatch.

15. The retube platform of claim 14, wherein the portion of the decking
surface is one of a
plurality of portions of the decking surface forming a plurality of hatches,
each of the plurality of
hatches being independently openable and closable with a corresponding servo
motor.


19



16. A method of using a retube platform system in a reactor vault to access
and service an
end face of a CANDU reactor core including a plurality of fuel channels
arranged in a grid, the
method comprising:

providing a plurality of columns, each of the plurality of columns being
supported on at
least one floor surface of the vault;

providing a platform including a frame and a decking surface secured to the
frame;
coupling the platform to the plurality of columns with an elevator system; and

operating the elevator system to move the platform with a vertical travel
substantially
equal to a height of the end face to provide access for personnel and retube
tooling to each of the
plurality of fuel channels during a retube process.

17. The method of claim 16, further comprising providing the elevator system
with a
plurality of servo motors, a plurality of ball-screw jacks, and a controller
coupled to the plurality
of servo motors, and wherein operating the elevator system includes
synchronously actuating the
plurality of servo motors with the controller.

18. The method of claim 16, further comprising opening a hatch to provide
access through
the decking surface.

19. The method of claim 18, wherein opening the hatch includes driving a
portion of the
decking surface to drop below and slide under an adjacent portion of the
decking surface.

20. The method of claim 18, wherein opening the hatch includes pivoting a
hinged portion of
the decking surface downwardly.




A single figure which represents the drawing illustrating the invention.

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Admin Status

Title Date
(22) Filed 2012-01-16
(41) Open to Public Inspection 2012-07-15
Examination Requested 2016-10-20

Maintenance Fee

Description Date Amount
Last Payment 2017-12-15 $200.00
Next Payment if small entity fee 2019-01-16 $100.00
Next Payment if standard fee 2019-01-16 $200.00

Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following

  • the reinstatement fee set out in Item 7 of Schedule II of the Patent Rules;
  • the late payment fee set out in Item 22.1 of Schedule II of the Patent Rules; or
  • the additional fee for late payment set out in Items 31 and 32 of Schedule II of the Patent Rules.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Filing $400.00 2012-01-16
Maintenance Fee - Application - New Act 2 2014-01-16 $100.00 2014-01-03
Maintenance Fee - Application - New Act 3 2015-01-16 $100.00 2015-01-13
Maintenance Fee - Application - New Act 4 2016-01-18 $100.00 2016-01-04
Request for Examination $800.00 2016-10-20
Maintenance Fee - Application - New Act 5 2017-01-16 $200.00 2017-01-04
Maintenance Fee - Application - New Act 6 2018-01-16 $200.00 2017-12-15

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Abstract 2012-01-16 1 19
Description 2012-01-16 17 937
Claims 2012-01-16 3 107
Drawings 2012-01-16 23 867
Representative Drawing 2012-03-13 1 37
Cover Page 2012-07-10 2 77
Prosecution-Amendment 2016-10-20 1 51
Prosecution-Amendment 2016-11-16 1 27
Prosecution-Amendment 2016-12-01 5 285
Drawings 2017-02-28 23 863
Claims 2017-02-28 3 103
Description 2017-02-28 17 931
Prosecution-Amendment 2017-02-28 18 1,006
Prosecution-Amendment 2017-04-26 4 222
Prosecution-Amendment 2017-07-21 4 109
Claims 2017-07-21 3 92
Prosecution-Amendment 2017-07-28 1 18
Prosecution-Amendment 2017-07-31 4 134
Claims 2017-07-31 3 95