ERECTION OF THE REACTOR CORE VESSEL AND NEW ROAD MAP
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Jules Horowitz Reactor
ERECTION OF THE REACTOR CORE VESSEL
AND NEW ROAD MAP
Jérôme BOUZAT ; Gilles BIGNAN
Contact: gilles.bignan@cea.fr
DE LA RECHERCHE À L’INDUSTRIE
RRFM 2021 Conference Helsinki
Commissariat à l’énergie atomique et aux énergies alternatives - www.cea.fr
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021
ABSTRACT
The JHR is a Material-Testing Reactor
optimised to support the safe development
of nuclear energy. With a maximum nuclear
power of 100 MW, the reactor is designed
to simultaneously accommodate a large
number of core and reflector experiments,
with a very large range of thermal and fast
flux levels.
This research reactor is under construction
at the CEA Cadarache site in France.
In November 2020, a major project milestone was reached: the installation on site of the reactor core vessel. This main step
finalizes the first phase of the assembly of the pile-block including the bottom plug, water boxes, core vessel, fuel rack and
closure head. This presentation will show you in detail the work performed to reach this successful milestone.
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 2
DESCRIPTION of the reactor pile block Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 3
Bottom plug (September 2019)
View from the pool
View from the crypt
In September twenty nineteen (2019) the
first pile-block equipment was received on
site : the bottom plug
It allows the guiding of the control rods of
the mechanisms, ensures the integrity of
the 2nd containment barrier, contributes
to the sealing between the water reactor
pool and the crypt and limits the dose
rate received by operators during crypt
interventions.
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 4
Water boxes (September and October 2019)
Primary cooling system
Reflector
cooling system
The primary cooling water box, channels the fluid to the core vessel. It accommodates the convergent as well as the stilling grid, which allows
homogenising the speed of the fluid before its change in direction.
You can see the mounting of the first water box after visual control and clamping on the bottom plug.
The reflector water box allows cooling of the pool and experimental devices. It supports displacement systems with chairs and fixing interfaces
In October the final clamping of the Reflector water box on primary cooling water box.
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 5
Water boxes (primary cooling system + Reflector) Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 6
Floor structure of reactor pool
Complete structure Chassis on site (October 2020)
On subcontractor’s workshop
Before the installation of the rest of the equipment of the pile-block, we put in place the floor structure in reactor pool.
The floor structure of the reactor pool contains different element:
• Reflector suction & discharge piping,
• Chassis, Deck, low & high supports, column & hoop
The assembly of these elements in the pool took place between January and October 2020.
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 7
Floor structure of reactor pool
Reflector suction pipe
The 4 chairs of the 4 displacement systems
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 8
Core vessel (November 19th, 2020)
The core vessel contains the fuel elements,
ensures the confinement of the primary
coolant and contributes to the cooling of in-
core irradiation devices (fuels, experimental
devices, control rods). Made of a specific
type of Aluminium, it participates in
neutron performances.
The mounting of the core vessel was
carried out in several steps:
• Introduction in the hall
• Tilting to the vertical
• Introduction into the pool
Prior being allowed to perform these
operations, strict cleanliness conditions had
to be set up in the reactor’s hall.
Operations have been carefully prepared to
ensure safe handling.
Height: 5185mm
Diameter: 716mm
Thickness: 20mm
Weight : 2T
Material:
Aluminium 6061 T6 and Inox
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 9
Core vessel (November 19th, 2020)
Out
Introduction into the reactor’s hall
Tilting Introduction into the reactor’s pool
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 10Fuel rack (January 26th, 2021)
The fuel rack accommodates fuel
element, inter-element mandrels,
irradiation test specimens, core
pressure loss and output pressure
measurements.
The 1st equipment to be introduced
in the core vessel was the fuel rack.
This was achieved on January 26th,
2021
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 11Closure head (January 28th, 2021) The closure head, mounted at the top of the vessel, must guarantee the confinement of the primary coolant during operation. It maintains and positions experimental devices and ensures anti-blow-out with a double lock. The closure head consists of massive mechanical parts and parts of precision mechanisms. The plates have many bores, holes and threads. This step closed the 1st phase of the assembly of the JHR pile block at the end of January 2021. Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 12
JHR ROADMAP
After implementation of Action Plan decided in 2019, the project situation
has been reassessed
Positive outputs:
- New organisation: Simplification of interface, better efficiency, focus on
delivery
- Technical configuration for installation and test phases defined
- Alignment of main subcontractors on project goals
- Launching of the licensing process (Safety Report issuance end 2021)
Technical situation
- Freeze od Basic design
- Detailed design on-going within main subcontractors
Lots of interface topics due to specific features of JHR (high density of equipment,
complex lay-out)
Uncertainty on quantities as long as 3D model is not yet completely finalized
- Identification of technical risks to be solved
- Uncertainties of installation duration due to complexity and high level of co-
activity
Need for getting feedback from installation in some limited area
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 13JHR ROADMAP
CEA decided a roadmap composed of two phases
1st phase: 2021-2023
- Completion of detailed design and finalization of layout (3D model)
- Closure of remaining technical open points
- Manufacturing and qualification of critical equipment
- Installation in limited areas in order to get feedback
2nd phase: after 2023
- Freeze of quantities in the basis of the detailed design and 3D model
- Installation at full speed up to tests and start-up
A project review milestone is set in 2023 in order:
- To reassess remaining works with a low level of uncertainties
- To reassess overall schedule on the basis of the installation duration
- To reassess cost at completion
Roadmap was validated by French state under conditions
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 14JHR ROADMAP
Endorsement for continuation by CEA of JHR Project
Major milestone with French Governement in mid 2023
Associated 2021 - 2023 Roadmap
Reinforced reporting and follow-up of the Project by French state
Financing has been organized for the coming years and will be reviewed in 2023
Commissariat à l’énergie atomique et aux énergies alternatives Auteur 21 septembre 2021 15Thank you for your attention
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