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Copyright © 2012 SCK•CEN
ALFRED Control Rod and Safety Rod
Copyright © 2012 SCK•CEN
ALFRED Control Rod and Safety Rod
Damien LAMBERTS
SCK•CEN ANS/NSDPrimary system design
LEADER WP meetingThe 20th of Novembre 2012, Karlsruhe
Copyright © 2012 SCK•CEN
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 lowergrid to prevented inadvertentextraction
Copyright © 2012 SCK•CEN
Rod interface with lower grid
The rod may not be mistakenly remove (CR & SR)Rods are locked in lower gridUnlocked by 30° rotation
The totation is only possible when the 6 neighbouringFA 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$).
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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 handlingBall 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 extendDucting the flushing Argon to the high speed
section
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Safety Rod upper interface
Only the feeding lines (& instrument connection) downstream the electro valve needs to be disconnected before the removal of the FA coverFast connection system (pneumatic and electric )
Flexible beam carries the connection lines form rod to the connection interfaceAllowing differential displacement of FA cover (≈5mm)
SR is located and spring loaded by the upper grid
Copyright © 2012 SCK•CEN
Conclusion
It seems possible to adapt the FASTEF design to ALFRED Interface with lower grid an upper grid are still to be
detailedPenetrations across FA cover show b deffined (sealing
system, cover temperature field..)
Detailed geometrical adaptation need to done in order toPerform curate insertion time calculation End accurate neutronic modelling
Copyright © 2012 SCK•CEN
Copyright © 2012 - SCKCEN
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•CENStudiecentrum voor Kernenergie
Centre d'Etude de l'Energie NucléaireBelgian Nuclear Research Centre
Stichting van Openbaar Nut Fondation d'Utilité Publique Foundation of Public Utility
Registered Office: Avenue Herrmann-Debrouxlaan 40 – BE-1160 BRUSSELSOperational Office: Boeretang 200 – BE-2400 MOL
