Method of storing a chimney assembly of a reactor pressure vessel during a nuclear reactor outage

Patent metadata

Field	Value
Publication number	US-9721687-B2
Application number	US-201414453118-A
Country	US
Kind code	B2
Filing date	Aug 6, 2014
Priority date	Aug 6, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A method of storing a chimney assembly of a reactor pressure vessel during a nuclear reactor outage includes detaching a chimney barrel with upper chimney partitions therein from a top guide assembly of the reactor pressure vessel. A height of the upper chimney partitions is less than a height of the chimney barrel so as to leave a plenum region in a top section of the chimney barrel. The top guide assembly includes lower chimney partitions therein. The lower chimney partitions are removed from the top guide assembly and inserted into the plenum region of the chimney barrel so as to be on the upper chimney partitions. As a result, the chimney assembly can be stored in a relatively compact form during a reactor outage. The chimney assembly includes a combination of at least the chimney barrel, the upper chimney partitions, and the lower chimney partitions.

First claim

The invention claimed is:

1. A method of storing a chimney assembly of a reactor pressure vessel during a nuclear reactor outage, comprising:
detaching a chimney barrel with upper chimney partitions therein from a top guide assembly of the reactor pressure vessel, a height of the upper chimney partitions being less than a height of the chimney barrel so as to leave a plenum region in a top section of the chimney barrel, the top guide assembly including lower chimney partitions therein;
removing the lower chimney partitions from the top guide assembly; and
inserting the lower chimney partitions into the plenum region of the chimney barrel so as to be on the upper chimney partitions, the chimney assembly being a combination of at least the chimney barrel, the upper chimney partitions, and the lower chimney partitions.

2. The method of claim 1 , wherein the upper chimney partitions are affixed to an interior of the chimney barrel.

3. The method of claim 1 , wherein the lower chimney partitions are not affixed to the top guide assembly, the lower chimney partitions being removable from the top guide assembly via lifting.

4. The method of claim 1 , wherein the plenum region has a size and shape that corresponds to a size and shape of the lower chimney partitions.

5. The method of claim 1 , wherein the detaching includes placing the chimney barrel with the upper chimney partitions in a radiation-shielding storage location during the nuclear reactor outage.

6. The method of claim 1 , wherein the detaching includes submerging the chimney barrel with the upper chimney partitions therein in a storage pool.

7. The method of claim 6 , wherein the inserting includes the lower chimney partitions being submerged in the storage pool.

8. The method of claim 1 , wherein the detaching includes maintaining an orientation of the chimney barrel.

9. The method of claim 1 , wherein the removing the lower chimney partitions includes exposing a top guide grid thereunder, the top guide grid being fixed to a top end of a core shroud of the reactor pressure vessel.

10. The method of claim 1 , wherein the nuclear reactor outage is at least one of a refueling outage and a maintenance outage.

Assignees

• Sprague Robin D
• Keck David Jonathan
• Ge Hitachi Nuclear Energy Americas Llc

Inventors

• Sprague Robin D
• Keck David Jonathan

Classifications

• G21C15/26

  by convection, e.g. using chimneys, using divergent channels · CPC title

• G21C19/32 Primary

  Apparatus for removing radioactive objects or materials from the reactor discharge area, e.g. to a storage place; Apparatus for handling radioactive objects or materials within a storage place or removing them therefrom (disposal of waste material G21F9/00) · CPC title

• G21C1/084

  Boiling water reactors · CPC title

• G21C1/322

  wherein the heat exchanger is disposed above the core · CPC title

• Y02E30/31

  Cross-Sectional Technologies · mapped topic