ADVENT Engineering Services, Inc.

CRDM Ductwork Modification for ANO Unit 1

Arkansas Nuclear One, Unit 1 (ANO-1) decided to replace the Reactor Vessel Closure Head (RVCH) and CRDM Service Support Structure (SSS), including its support skirt. The SSS cooling duct was also to be modified, to reduce the number of components to be disassembled and reassembled during refueling outages, and thereby to reduce worker radiation exposure and refueling outage critical path times.

Cooper Nuclear Station

Integrated Head Assembly for Diablo Canyon Units 1 and 2

As part of the reactor vessel head replacement project at Diablo Canyon Power Plant (DCPP) Units 1 and 2, ADVENT Engineering Services, Inc. designed an Integrated Head Assembly (IHA) as a replacement of the existing RVCH service structure for Pacific Gas & Electric Company (PG&E). The IHA consists of the following components: support structure assembly, cooling shroud, integrated radiation shielding in the lower section of the cooling shroud above the RV head, integrated cooling ductwork system, integrated missile shield, integrated lift rig assembly, integrated RV closure stud hoist rail assembly, cable trays, conduits and connectors inside IHA, folding type cable bridges to route cables between the IHA and the bulkhead on the refueling floor, integrated cooling fans, upper seismic braces, inspection and maintenance doors in the lower section of the cooling shroud.

RVCH Service Structure Upgrade at D.C. Cook Units 1 & 2

As part of the reactor vessel head replacement project at D. C. Cook Unit 2, ADVENT Engineering Services, Inc. designed an upgrade to the existing RVCH service structure (Enhanced Service Structure, ESS) for American Electric Power Company (AEP). The cooling shroud and its support columns, the bottom ring beam, the cooling baffle, the air plenum, the external ductwork, the cable trough assembly, the messenger wires and supports, and the cable bridges are new components which were added to the existing service structure to enhance the performance of the structure. A new modified CRDM cooling system in the ESS consisting of a cooling baffle with orifice plates, a cooling shroud and its support structure, an air plenum, and external ductwork was also added. Five cable bridges were also provided in the ESS to route the cables from the CRDMs to the containment windows. These cable bridges can be raised or lowered and are designed to stay with the ESS during lifting of the ESS with the RVCH.

Korean Next Generation Reactor

Shin Kori Units 1 and 2

North Anna Units 1 and 2

Integrated Head Assembly for Salem Units 1 and 2

As part of the reactor vessel head replacement project at Salem Units 1 and 2, ADVENT Engineering Services, Inc. designed an Integrated Head Assembly (IHA) for Public Service Enterprise Group, LLC (PSEG). The IHA consists of the following components: support structure assembly, cooling shroud, integrated radiation shielding in the lower section of the cooling shroud above the RV head, integrated cooling ductwork system, integrated missile shield, integrated lift rig assembly, integrated RV closure stud hoist rail assembly, cable trays, conduits and connectors inside IHA, folding type cable bridges to route cables between the IHA and the bulkhead on the refueling floor, integrated cooling fans, upper seismic braces, inspection and maintenance doors in the lower section of the cooling shroud.

San Onofre Unit 2

CEDM Ductwork Modification for St. Lucie Unit 1

St. Lucie Unit 1 decided to replace the Reactor Vessel Closure Head (RVCH) and modify the CEDM Cooling Ductwork. The CEDM cooling duct and shroud modifications are for the purpose of reducing the number of components to be disassembled and reassembled during refueling outages, and thereby to reduce worker radiation exposure and refueling outage critical path times.

CEDM Ductwork Modification and Cooling Shroud Replacement for St. Lucie Unit 2

Florida Power & Light Company (FPL) decided to replace the Reactor Vessel Closure Head (RVCH) at St. Lucie Unit 2. For the purpose of reducing the number of components to be disassembled and reassembled during refueling outages, and thereby to reduce worker radiation exposure and refueling outage critical path times, the existing CEDM cooling shroud assembly and ductwork were also replaced. The modification included providing two new external ducts between the cutouts in the cooling shroud and two cavity wall air openings, providing a blind flange on the third air opening on the cavity wall and providing quick connect / disconnect type connections on all new joints.

CEDM Support Plate (Cheese Plate) for the RRVCH

Florida Power & Light Company (FPL) replaced the Reactor Vessel Closure Head (RRVCH) at St. Lucie Unit 2. The replacement cooling shroud, which is bolted to the RRVCH, was installed on the RRVCH outside the Reactor Building containment. The Control Element Drive Mechanism (CEDM) pressure housings, was also installed on the RRVCH outside the Reactor Building and was required to be supported near their free ends when the RRVCH is being moved from a vertical position to a horizontal position and vice versa.

Conceptual Design for the Integrated Head Assembly for Palo Verde Units 1, 2 & 3

As part of the reactor vessel head replacement project at Palo Verde Units 1, 2 & 3, ADVENT Engineering Services, Inc. developed a conceptual design of a Two Part Integrated Head Assembly (IHA) as a replacement of the existing RVCH service structure for Arizona Public Services (APS). ADVENT developed several concepts for this replacement structure that provided ongoing cost, schedule, and dose savings by reducing the number of polar crane lifts and providing easier access to refuel maintenance work areas.

Surry Unit 1

Trojan

Integrated Head Assembly for Turkey Point Units 3 & 4

The Florida Power and Light Company (FPL) replaced their Reactor Vessel Closure Head (RVCH) assemblies at Turkey Point Units 3 and 4. A new Integral Head Assembly (IHA) was provided as a part of the head replacement project. The IHA consists of the following components: support structure assembly, cooling shroud, integrated radiation shielding in the lower section of the cooling shroud above the RV head, integrated cooling ductwork system utilizing the existing CRDM coolers, integrated missile shield, integrated lift rig assembly, integrated RV closure stud hoist rail assembly, cable trays, conduits and connectors inside IHA, folding type cable bridges to route cables between the IHA and the bulkhead on the refueling floor, option to install integrated cooling fans at a later date, upper seismic braces, inspection and maintenance doors in the lower section of the cooling shroud.