Bulletin 1/2011 - Siempelkamp

Special lifting devices for nuclear technology –
completely by Siempelkamp:
Siempelkamp utilizes
synergy potentials
the cross-divisional collaboration offers many advantages: For
Snt customers the concept pays off in high-quality production.
the cooperation avoids friction losses thanks to an effective interface
management and provides direct con trol. “Furthermore, it
ensures to protect the technical production skills and the Snt
know-how regarding lifting devices stays in-house,” summarizes
Michael Szukala, Managing Director of Snt.
Nuclear technology + machine and plant engineering =
bridging two sectors
the existing infrastructure provided the best conditions to approach
the lifting device business together under the Siempelkamp
umbrella. In 2006/2007 the machine and engineering business
unit invested largely in its production facility to produce ever
higher quality products. this includes the mechanical machining
of rollers for ContiRoll® presses and large components from
Siempelkamp Foundry, but also components for the nuclear technology
unit to meet the highly technical requirements for this
sector.
For customers in China and Germany, both Siempelkamp business
units are currently providing proof of their bundled competence.
For the current new building projects taishan I and II,
Siempelkamp manufactures and supplies reactor pressure vessel
(RPV) lifting devices for the RPV closure head. the German nuclear
power plants Grafenrheinfeld and Unterweser will each receive
a multi-purpose lifting device which will be used for the handling
of pressure vessel internals.
Lifting devices for the reactor pressure vessel closure heads
at Taishan I + II
In 2009 Siempelkamp nukleartechnik received the order for the
supply of two lifting devices for the new nuclear power plant
units I + II in taishan, China. these lifting devices will carry out the
lifting and lowering of the reactor pressure vessel closure head
SieMpelkaMp | nUCLEAR tECHnOLOGy
and represent a protection system for the control rod drives
against outside impacts. the lifting devices incorporate the complete
cabling for the instrumentation, the control system and the
control of the control rod drives. For the removing of the head,
the bolted connections in the flange and then plug connections
have to be loosened first. Afterwards, the polar crane can transport
the head to the storage location. the head weighs about
180 t (198 US tons).
Another task of the lifting devices involves the support of the 89
control rod drives sticking out from the pressure vessel head. In
the case of an outside impact, a bending or snapping off of the
control rod drives has to be prevented because only fully functional
control rods allow the shutting down of the reactor. this support
becomes possible with four restraint systems connecting the
lifting device with the building and a complex honeycomb structure
in the central ring of the lifting device supporting the 89
control rod drives. the upper lifting rig, which is part of the lifting
device for the closure head, also transports and handles the tensioning
device and insulation materials.
One multi-purpose lifting device each for the nuclear
power plants Grafenrheinfeld and Unterweser
the multi-purpose lifting devices for the nuclear power plants
Grafenrheinfeld and Unterweser, which were ordered from
Siempelkamp nukleartechnik in 2010, are lifting devices for the
handling of pressure vessel internals. this includes the upper and
lower core grid with and without the rods of the control rod drive.
the weight lifting capacity of the lifting device amounts to 50,000
kg (55 US tons) on the suspension bolts raising the upper core
grid. 152,000 kg (167 US tons) is the estimated lifting capacity for
the gripping tongs for raising the upper and lower core grid.
the multi-purpose lifting device also makes it possible to place
the shielding or sealing head on the reactor pressure vessel.