Canadian Patents Database / Patent 2766472 Summary

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(12) Patent Application: (11) CA 2766472
(54) English Title: CALANDRIA TUBE INSERT REMOVAL FOR REACTOR RETUBING
(54) French Title: ENLEVEMENT DES DISPOSITIFS D'INSERTION DES TUBES DE CALANDRE POUR LE REMPLACEMENT DES TUBES D'UN REACTEUR NUCLEAIRE
(51) International Patent Classification (IPC):
  • G21C 17/017 (2006.01)
  • G21C 21/00 (2006.01)
(72) Inventors (Country):
  • KAMLER, FRANK (Canada)
  • KING, JAMES MITCHELL (Canada)
  • SOLTI, GEORGE (Canada)
  • COX, CLAIR ARTHUR (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: 2012-07-17
Examination requested: 2016-10-20
(30) Availability of licence: N/A
(30) Language of filing: English

(30) Application Priority Data:
Application No. Country Date
61/433,471 United States of America 2011-01-17

English Abstract

Methods, apparatuses, and systems for removing an insert attaching a calandria tube to a tube sheet in a nuclear reactor during retubing of the reactor. One method includes (a) advancing a removal tool into a lattice site including a calandria tube and an insert until a head of the removal tool is positioned within a diameter of the calandria tube, (b) expanding at least one retractor of the removal tool radially to align the at least one retractor inboard of the insert, (c) retracting the at least one retractor axially to remove the insert from the calandria tube and the tube sheet and collect the insert on the removal tool, and (d) retracting the removal tool, with the collected insert, from the lattice site.


French Abstract

Des procédés, des appareils et des systèmes pour retirer une pièce rapportée fixant un tube de calandre à une plaque tubulaire dans un réacteur nucléaire durant le retubage du réacteur. Un procédé consiste a) à faire avancer un outil de retrait dans un site interstitiel comprenant un tube de calandre et une pièce rapportée jusquà ce quune tête de loutil de retrait soit positionnée dans un diamètre du tube, b) à élargir au moins un rétracteur de loutil de retrait radialement pour aligner le au moins un rétracteur à lintérieur de la pièce rapportée, c) à rétracter au moins un rétracteur axialement pour retirer la pièce rapportée du tube de calandre et de la plaque tubulaire et récupérer la pièce rapportée sur loutil de retrait et d) à rétracter loutil de retrait, avec la pièce récupérée, depuis le site interstitiel.


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




Claims

What is claimed is:


1. A method of removing an insert attaching a calandria tube to a tube sheet
in a nuclear
reactor during retubing of the reactor, the method comprising:

(a) advancing a removal tool into a lattice site including a calandria tube
and an insert
until a head of the removal tool is positioned within a diameter of the
calandria tube;

(b) expanding at least one retractor of the removal tool radially to align the
at least one
retractor inboard of the insert;

(c) retracting the at least one retractor axially to remove the insert from
the calandria tube
and the tube sheet and collect the insert on the removal tool; and

(d) retracting the removal tool, with the collected insert, from the lattice
site.

2. The method of Claim 1, further comprising gripping, with the head of the
removal tool, at
least a portion of the diameter of the calandria tube and releasing the head
of the removal tool
from the diameter of the calandria tube after the insert is removed from the
calandria tube.

3. The method of Claim 2, wherein gripping at least a portion of the diameter
of the
calandria tube includes gripping at least a portion of a minor diameter of the
calandria tube.
4. The method of Claim 2, wherein gripping at least a portion of the diameter
of the
calandria tube includes gripping at least a portion of a bell section of the
calandria tube.

5. The method of Claim 1, further comprising mounting the removal tool on a
removal
pallet system configured to advance and retract the removal tool into and out
of the lattice site.
6. The method of Claim 5, further comprising mounting a flask on the removal
pallet
system in front of the lattice site.


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7. The method of Claim 6, wherein advancing the removal tool into the lattice
site includes
advancing, with the removal pallet system, the removal tool through the flask
and into the lattice
site.

8. The method of Claim 1, further comprising installing a hardstop sleeve into
the lattice
site before advancing the removal tool into the lattice site.

9. The method of Claim 8, further comprising removing the hardstop sleeve from
the lattice
site after retracting the removal tool from the lattice site.

10. The method of Claim 1, further comprising repeating steps (a) through (d)
for a
predetermined number of lattice sites to collect the predetermined number of
inserts on the
removal tool.

11. The method of Claim 10, further comprising retracting the removal tool
with the
predetermined number of inserts from a flask and stripping the predetermined
number of inserts
from the removal tool using at least one post mounted inside the flask.






12. A tool for removing an insert attaching a calandria tube to a tube sheet
in a nuclear
reactor during retubing of the reactor, the tool comprising:

a ram body configured to be advanced into a lattice site containing a
calandria tube and
an insert until a head of the ram body is positioned within a diameter of the
calandria tube; and
at least one retractor positioned on the ram body, the at least one retractor
configured to
expand radially to be aligned inboard of the insert and to retract axially to
remove the insert from
the calandria tube and the tube sheet,

the ram body configured to collect the removed insert and be retracted from
the lattice
site with the collected insert.

13. The tool of Claim 12, further comprising at least one gripper positioned
on the head of
the ram body, the at least one gripper configured to grip at least a portion
of the diameter of the
calandria tube and to release the diameter of the calandria tube after the
insert is removed from
the calandria tube.

14. The tool of Claim 13, wherein the diameter of the calandria tube includes
a minor
diameter of the calandria tube.

15. The tool of Claim 13, wherein the diameter of the calandria tube includes
a bell section of
the calandria tube.

16. The tool of Claim 12, further comprising a frame for mounting the tool on
a removal
pallet system configured to advance and retract the ram body.

17. The tool of Claim 16, further comprising a carriage coupled to the ram
body, the carriage
advanced and retracted by the removal pallet system.

18. The tool of Claim 12, further comprising a pull rod and linear drive
assembly configured
to actuate the at least one retractor.

21




19. The tool of Claim 12, further comprising a backstop positioned on the ram
body and
configured to prevent the collected removed insert from traveling lengthwise
along the ram body
in at least one direction as the ram body is retracted from the lattice site.

20. The tool of Claim 12, wherein the at least one retractor is further
configured to be
expanded radially to engage in inner surface of the insert.

22




21. A system for removing an insert attaching a calandria tube to a tube sheet
in a nuclear
reactor during retubing of the reactor, the system comprising:

a removal tool configured to be advanced into a lattice site including a
calandria tube and
an insert until a head of the removal tool is positioned within a minor
diameter of the calandria
tube, to grip at least a portion of the minor diameter of the calandria tube,
to expand at least one
retractor radially to align the at least one retractor inboard of the insert,
to retract the at least one
retractor axially to remove the insert from the calandria tube and the tube
sheet and collect the
insert on the removal tool, to release the head of the removal tool from the
minor diameter of the
calandria tube, and to be retracted, with the collected insert, from the
lattice site;

a removal pallet system configured to advance the removal tool into the
lattice site and
retract the removal tool from the lattice site, wherein the removal tool is
mounted on the removal
pallet system; and

a flask mounted on the removal pallet system and configured to receive the
removal tool,
with the collected insert, after the removal tool is retracted from the
lattice site and strip the
collected insert from the removal tool as the removal tool is retracted from
the flask.

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A single figure which represents the drawing illustrating the invention.

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Admin Status

Title Date
(22) Filed 2012-01-16
(41) Open to Public Inspection 2012-07-17
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
Final $300.00 2017-12-01
Maintenance Fee - Application - New Act 6 2018-01-16 $200.00 2017-12-15

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Document
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Abstract 2012-01-16 1 19
Description 2012-01-16 18 1,045
Claims 2012-01-16 5 149
Drawings 2012-01-16 5 183
Cover Page 2012-07-10 1 33
Prosecution-Amendment 2016-10-20 1 49
Prosecution-Amendment 2016-10-24 1 30
Prosecution-Amendment 2016-11-25 5 239
Prosecution-Amendment 2017-02-27 30 1,012
Drawings 2017-02-27 19 448
Claims 2017-02-27 5 149
Description 2017-02-27 18 1,034
Prosecution-Amendment 2017-04-10 4 201
Representative Drawing 2017-04-10 1 42
Prosecution-Amendment 2017-05-10 22 558
Drawings 2017-05-10 21 474
Correspondence 2017-12-01 2 71
Representative Drawing 2018-01-09 1 24
Cover Page 2018-01-09 1 58