Canadian Patents Database / Patent 2766440 Summary

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(12) Patent Application: (11) CA 2766440
(54) English Title: FEEDER PLATFORM FOR NUCLEAR REACTOR
(54) French Title: PLATE-FORME DE CONDUITES D'ALIMENTATION POUR 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):
  • KORELL, NORMAN DAVID WILSON (Canada)
  • LAPAGE, PIERRE JEAN PAUL (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: 2012-07-14
Examination requested: 2016-10-20
(30) Availability of licence: N/A
(30) Language of filing: English

(30) Application Priority Data:
Application No. Country Date
61/432,960 United States of America 2011-01-14

English Abstract





A feeder platform system for installation in a reactor vault adjacent an end
of a CANDU reactor
core for accessing a feeder cabinet and feeder tubes therein during a retube
process. The feeder
platform system includes front and rear platforms. The front platform is
movable between a
variety of heights in a first vertical space adjacent the reactor core. The
rear platform is movable
between a variety of heights in a second vertical space adjacent the first
vertical space. The front
and rear platforms define respective lengths parallel to and spaced from the
end of the reactor
core. At least one of the lengths can be increased with a plurality of
extensions releasably
connectable with at least one of the front and rear platforms. Lifting
mechanisms are coupled to
each of the front and rear platforms and configured to raise and lower the
front and rear
platforms independently within the respective first and second vertical
spaces.


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




CLAIMS

1. A feeder platform system for installation in a reactor vault adjacent an
end of a CANDU
reactor core for accessing a feeder cabinet and feeder tubes therein during a
retube process, the
feeder platform system comprising:

a front platform movable between a variety of heights in a first vertical
space adjacent the
reactor core, the front platform defining a first length parallel to and
spaced from the end of the
reactor core;

a rear platform movable between a variety of heights in a second vertical
space adjacent
the first vertical space, the second platform defining a second length
parallel to and spaced from
the end of the reactor core;

lifting mechanisms coupled to each of the front and rear platforms and
configured to raise
and lower the front and rear platforms independently within the respective
first and second
vertical spaces; and

a plurality of extensions releasably connectable with at least one of the
front and rear
platforms to increase at least one of the first and second lengths.


2. The feeder platform system of claim 1, wherein the lifting mechanisms
includes a
plurality of strand jacks movably supporting the front and rear platforms by a
plurality of cables.

3. The feeder platform system of claim 1, wherein the front platform includes
a pair of
opposed lateral ends at the ends of the first length, and each of the lateral
ends is provided with a
recess configured to accommodate a fueling machine bridge column of the
reactor vault located
within the first vertical space.


4. The feeder platform system of claim 3, wherein the plurality of extensions
are releasably
connectable with the opposed lateral ends of the front platform, and wherein
the plurality of
extensions, when connected with the front platform, cooperate with the
recesses to define a pair
of apertures configured to receive the fueling machine bridge columns.



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5. The feeder platform system of claim 1, wherein the plurality of extensions
includes a first
plurality of extensions releasably connectable with the front platform to
increase the first length
to a third length, and a second plurality of extensions releasably connectable
with the rear
platform to increase the second length to a fourth length.


6. The feeder platform system of claim 5, wherein the lifting mechanisms are
configured to
raise the front and rear platforms to a first height for extending to the
third and fourth lengths,
and to a second height above the first height for accessing the feeder tubes.


7. The feeder platform system of claim 1, wherein the front and rear platforms
are
releasably connectable to each other to form a rigid conjoined platform.


8. The feeder platform system of claim 7, further comprising at least one
lateral brace
configured to releasably secure the rigid conjoined platform relative to the
reactor vault.

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9. A method of using a feeder platform system in a reactor vault to access and
service a
feeder cabinet of a CANDU reactor, the method comprising:

providing a reactor vault adjacent a reactor core of the CANDU reactor, the
reactor vault
including a feeder cabinet, a plurality of feeder tubes positioned inside the
feeder cabinet, a pair
of fueling machine bridge columns, a column support adjacent an upper end of
each of the
fueling machine bridge columns, the column supports supporting an overhead
gantry crane
having a bridge beam spanning the column supports;

positioning a platform on a floor of the reactor vault adjacent the reactor
core, the
platform defining a width measured away from the reactor core and a length
measured
perpendicular to the width, the length being less than a spacing distance
between the column
supports;

lifting the platform between the column supports to a first height above the
column
supports and below a top of the gantry crane bridge beam;

from the platform, with the platform at the first height, removing a portion
of the feeder
cabinet to at least partially expose the plurality of feeder tubes;

extending the length of the platform with at least one releasably connectable
extension to
a length exceeding the spacing distance between the column supports while the
platform is at the
first height;

lifting the platform to a second height above the column supports and above
the top of the
gantry crane bridge beam; and

from the platform, with the platform at the second height, servicing the
plurality of feeder
tubes.







10. The method of claim 9, wherein the platform is a front platform movable in
a vertical
space adjacent the reactor core, the method further comprising:

positioning a rear platform on a floor of the reactor vault in a vertical
space adjacent the
first vertical space and spaced away from the reactor core, the rear platform
defining a rear
platform width measured away from the first vertical space and a rear platform
length measured
perpendicular to the width, the rear platform length being less than the
spacing distance between
the column supports;

lifting the rear platform between the column supports to the first height;

from the rear platform, with the rear platform at the first height, removing
an additional
portion of the feeder cabinet to at least partially expose the plurality of
feeder tubes;

extending the rear platform length with at least one releasably connectable
extension to a
length exceeding the spacing distance between the column supports while the
rear platform is at
the first height;

lifting the rear platform to the second height; and

from the rear platform, with the rear platform at the second height, servicing
the plurality
of feeder tubes.


11. The method of claim 10, further comprising releasably coupling the front
and rear
platforms to each other with both platforms at the second height.


12. The method of claim 11, further comprising releasably securing at least
one of the front
and rear platforms relative to the reactor vault with at least one lateral
brace.


13. The method of claim 10, wherein removing an additional portion of the
feeder cabinet to
at least partially expose the plurality of feeder tubes includes removing a
soffit portion of the
feeder cabinet, and the at least partially exposed plurality of feeder tubes
include upper feeder
tubes coupled to at least one header.



16




14. The method of claim 13, further comprising:

from the rear platform, with the rear platform at the second height, removing
a rear wall
of the feeder cabinet to further expose the upper feeder tubes.


15. The method of claim 9, further comprising detaching the extension from the
platform and
lowering the platform back to the floor.


16. The method of claim 9, wherein removing a portion of the feeder cabinet to
at least
partially expose the plurality of feeder tubes includes removing a soffit
portion of the feeder
cabinet, and the at least partially exposed plurality of feeder tubes include
upper feeder tubes
coupled to at least one header.



17




17. A CANDU-type nuclear reactor site comprising:
a reactor core including a calandria having an end;
a vault enclosing the calandria end;

a pair of fueling machine bridge columns positioned in a first vertical space
adjacent the
reactor core, each of the fueling machine bridge columns being secured to the
vault with a
corresponding column support, the column supports further supporting an
overhead gantry crane
movable along the column supports;

a front platform movable between a variety of heights in the first vertical
space, the front
platform defining a first length measured parallel to the calandria end, the
first length being less
than a spacing distance between the column supports;

a rear platform movable between a variety of heights in a second vertical
space adjacent
the first vertical space, the second platform defining a second length
measured parallel to the
calandria end, the second length being less than the spacing distance between
the column
supports;

lifting mechanisms coupled to each of the front and rear platforms and
configured to raise
and lower the front and rear platforms independently within the respective
first and second
vertical spaces; and

a plurality of extensions releasably connectable with at least one of the
front and rear
platforms to increase at least one of the first and second lengths to a length
greater than the
spacing distance between the column supports when the at least one of the
front and rear
platforms is raised above the column supports by the lifting mechanisms.


18. The CANDU-type nuclear reactor site of claim 17, wherein the front
platform includes a
pair of opposed lateral ends at the ends of the first length, and each of the
lateral ends is provided
with a recess that accommodates one of the fueling machine bridge columns.



18




19. The CANDU-type nuclear reactor site of claim 18, wherein the plurality of
extensions are
releasably connectable with the opposed lateral ends of the front platform,
and wherein the
plurality of extensions, when connected with the front platform, cooperate
with the recesses to
define a pair of apertures that receive the fueling machine bridge columns.


20. The CANDU-type nuclear reactor site of claim 17, wherein the overhead
gantry crane
includes at least one bridge beam, and the lifting mechanisms are configured
to raise the front
and rear platforms to a working height above the at least one bridge beam so
that the overhead
gantry crane has full mobility.



19


Sorry, the representative drawing for patent document number 2766440 was not found.

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Admin Status

Title Date
(22) Filed 2012-01-16
(41) Open to Public Inspection 2012-07-14
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 23
Description 2012-01-16 12 629
Claims 2012-01-16 7 219
Drawings 2012-01-16 3 154
Cover Page 2012-07-10 1 35
Prosecution-Amendment 2016-10-20 1 51
Correspondence 2016-10-26 1 27
Prosecution-Amendment 2016-12-19 3 197
Prosecution-Amendment 2017-03-17 19 695
Abstract 2017-03-17 1 21
Description 2017-03-17 12 585
Claims 2017-03-17 5 150
Drawings 2017-03-17 12 418
Prosecution-Amendment 2017-05-05 3 163
Prosecution-Amendment 2017-07-05 5 217
Claims 2017-07-05 5 149
Drawings 2017-07-05 12 429