1. ALFRED Control Rod and Safety Rod

2. ALFRED Control Rod and Safety Rod
Damien LAMBERTS
SCK•CEN ANS/NSD
Primary system design
LEADER WP meeting
The 20th of Novembre 2012, Karlsruhe

3. Scope & introduction
These rod were developed in framework of CDT (Central Design Team : FASTEF)
See Pervious Presentation (The 25th of October 2011, Bologna )
The rod design has been change to fit into ALFRED
The position for the rods are dedicated with special interface
The rod pressed down onto lower grid (like the grid)
The absorber bundle is kept in place
while removing the FA cover and
upper grid for refuelling.
Rods are locked into the lower
grid to prevented inadvertent
extraction

4. Rod interface with lower grid
The rod may not be mistakenly remove (CR & SR)
Rods are locked in lower grid
Unlocked by 30° rotation
The totation is only possible when the 6 neighbouring
FA are removed
during normal operation the male the male
toothed ring is pressed against the centring cone
If If pull up the male toothed
ring is retained by female
toothed ring
small (1 mm) upward motion
Small reactivy effect (≈-0.02$).

5. Control Rod upper interface
The guide tube is push down by upper grid (via springs)
actuation link is divided in 2 parts connected by a spherical joint
Socket is part lower half that stays in the reactor during
refuelling
the socket is lowered to avoid inadvertent actuation
during handling
Ball is part of the upper half that is removed prior
FA cover removal.
Differential expansion (FA cover vs upper grid)
is taken by the spherical joint
the armature hinge
The casing is extend
Ducting the flushing Argon to the high speed
section

6. Safety Rod upper interface
Only the feeding lines (& instrument connection) downstream the electro valve needs to be disconnected before the removal of the FA cover
Fast connection system (pneumatic and electric )
Flexible beam carries the connection lines form rod to the connection interface
Allowing differential displacement of FA cover (≈5mm)
SR is located and spring loaded by the upper grid

7. Conclusion It seems possible to adapt the FASTEF design to ALFRED
Interface with lower grid an upper grid are still to be detailed
Penetrations across FA cover show b deffined (sealing system, cover temperature field..)
Detailed geometrical adaptation need to done in order to
Perform curate insertion time calculation
End accurate neutronic modelling

8. Copyright © 2012 - SCKCEN SCK•CEN
PLEASE NOTE!
This presentation contains data, information and formats for dedicated use ONLY and may not be copied, distributed or cited without the explicit permission of the SCK•CEN. If this has been obtained, please reference it as a “personal communication. By courtesy of SCK•CEN”.
SCK•CEN
Studiecentrum voor Kernenergie
Centre d'Etude de l'Energie Nucléaire
Belgian Nuclear Research Centre
Stichting van Openbaar Nut
Fondation d'Utilité Publique
Foundation of Public Utility
Registered Office: Avenue Herrmann-Debrouxlaan 40 – BE-1160 BRUSSELS
Operational Office: Boeretang 200 – BE-2400 MOL