Page 253 - Beyond Decommissioning

234 Beyond Decommissioning

Fig. 6.31 Research reactor (FRN) hall, Helmholtz Zentrum Munich. The octagonal concrete
structure on the right covers the old decommissioned FRN.
Photo by Tuomas Puukko, Creative Commons BY-NC-SA 2.0.

equation. The actual operation data of the Musashi Reactor such as core excess reac-
tivity, control rod worth, reactivity effect of fuel temperature was incorporated into the
software. However, to simulate experiences of criticality and reactivity effect of fuel,
reflector and void elements, the actual operation data base was not enough. Neutron
transport calculations using the MCNP code were made to provide the core location-
dependent reactivity effect of each element. These results were also incorporated into
the software.
The functions essential to the operation of the reactor are reutilized. These are
meters, recorders, switches, dropping control rods (scram), and interlock used during
reactor operation. Consequently, one can experience very realistic TRIGA reactor
operation through control rod operation and monitoring console panels.

6.5.11 Nuclear Reactor, Sweden (Zublin, 2016)

After a few years of basic nuclear research, Sweden built in 1954 a 300-kW (later
upgraded to 1 MW) reactor, named Reaktor 1 (R1), in a reactor hall 25 m underneath
the Royal Institute of Technology (KTH, in Swedish). Today this might appear weird,
since some 40,000 people lived within 1 km from the reactor. The 1950s were years of
limited attention to nuclear risks; and R1 was very important strategically.
On July 13, 1954 the reactor reached criticality. Until 1970, R1 was the nucleus of
Sweden’s nuclear R&D. But on that year the reactor was permanently shut down,
mainly due to the risk of running a nuclear reactor in downtown Stockolm. R1 reactor
hall is now used as an experimental place for art, dance, and media technology. The
main objective in planning this redevelopment was to explore how elements of new