SLOWPOKE reactor

Source: Wikipedia, the free encyclopedia.
"SLOWPOKE" redirects here. For the Pokémon species, see
Slowpoke and Slowbro
.
SLOWPOKE reactor
fissile material
)		Information missing
Primary coolantLight-water
Reactor usage
Primary useNeutron activation analysis

The SLOWPOKE (acronym for Safe LOW-POwer Kritical Experiment) is a family of low-energy,

critical mass, but provide neutron fluxes higher than available from a small particle accelerator or other radioactive sources
.

Basic design

SLOWPOKE reactor core model.

The SLOWPOKE-2 reactors (most numerous of SLOWPOKE-family reactors) originally used 93% highly

inherent safety; that is, it can regulate itself through passive, natural means, such as the chain reaction slowing down if the water heats up or forms bubbles
. These characteristics are so dominant, in fact, that the SLOWPOKE-2 reactor is licensed to operate unattended overnight (but monitored remotely). Most SLOWPOKES are rated at a nominal 20 kW, although operation at higher power for shorter durations is possible.

History

SLOWPOKE-1 and SLOWPOKE-2

The SLOWPOKE research reactor was conceived in 1967 at the Whiteshell Laboratories of AECL. In 1970 a prototype unit called SLOWPOKE (both the name of the reactor and of the prototype reactor class of 2 reactors it was a member of; especially later when further generations of SLOWPOKE reactors had appeared, these type of reactors were named SLOWPOKE-1), was designed and built at Chalk River Laboratories. It was primarily intended for Canadian universities, providing a higher neutron flux than available from small commercial accelerators, while avoiding the complexity and high operating costs of existing nuclear reactors. The Chalk River prototype went critical in 1970, and was moved to the University of Toronto in 1971. It had one sample site in the beryllium reflector and operated at a power level of 5 kW. In 1973 the power was increased to 20 kW and the period of unattended operation was increased from 4 hours to 18 hours. The reactor was dismantled in 1976 and replaced in University of Toronto by a next generation SLOWPOKE-2 reactor.

The first commercial example started construction in 1970 and was started up 14 May 1971 at AECL's Commercial Products Division in Tunney's Pasture - 20 Goldenrod Driveway, Ottawa, Ontario. It had a power output of 20 kW (thermal) and it was of the SLOWPOKE/SLOWPOKE-1 type. The reactor was a prototype and was shut down 1984.

Two reactors of SLOWPOKE aka SLOWPOKE-1 type were built. Both reactors have been decommissioned.

In 1976 a next generation commercial design, named SLOWPOKE-2 (again both the name of the reactor and reactor class, further members of which were constructed elsewhere), was installed at the University of Toronto, replacing the original SLOWPOKE-1 unit (see above). The commercial model has five sample sites in the beryllium reflector and five sites stationed outside the reflector.

Between 1976 and 1985, further seven SLOWPOKE-2 reactors with

MDS Nordion reactor in Kanata), and three converted to LEU (Polytechnique Montreal , University of the West Indies and Royal Military College of Canada
).

All in all, eight SLOWPOKE-2 reactors were built, seven in Canada and one in Jamaica.[3] As of 2022, of the eight, three are operational (the ones using/converted for LEU) and five have been decommissioned.

SLOWPOKE-3 and SLOWPOKE-4

AECL also designed and built (start of construction 1985, start of operation 1987) a scaled-up version (2-10 MWth) called the SLOWPOKE Demonstration Reactor (SDR, SLOWPOKE-3) for

Whiteshell Nuclear Research Establishment in Manitoba. The economics of a district-heating system based on SDR technology were estimated to be competitive with that of conventional fossil fuels
. However, the market for this technology did not materialize, and the proposed SES-10 (SLOWPOKE-4 based on SDR experience) was never built, and the SDR shutdown for decommissioning in 1989.

Marine Power Source

During the mid-1980s Canada briefly considered converting its

Oberon class submarines to nuclear power using a SLOWPOKE nuclear reactor to continuously recharge the ship's batteries during submerged operations.[4] A good deal of work had been done on potential marine applications of the reactor at Royal Military College of Canada.[5]

Current applications

SLOWPOKE reactors are used mainly for

neutron spectrum
in the irradiation sites does not change and the neutron flux is reproducible to about 1%.

Three of the original reactors are still in operation. Although all of the technical goals of this reactor were achieved, the lack of foreign sales was disappointing.

Former applications

Two of the SLOWPOKE/SLOWPOKE-1 reactors (out of 2 built), five of the SLOWPOKE-2 reactors (out of 8 built) and the single SLOWPOKE-3 reactor (out of 1 built) have been decommissioned. No SLOWPOKE-4 reactor was ever built.

  • Dalhousie University applied for, and was issued, a Licence to de-fuel, and decommission the SLOWPOKE-2 Reactor Facility, which was part of Dalhousie’s Trace Analysis Research Centre in Halifax, Nova Scotia on August 31, 2011. Dalhousie's SLOWPOKE-2 reactor (20 kW thermal) was built and started operation in 1976; it was dismantled 2011.[9]
  • The University of Toronto’s SLOWPOKE/SLOWPOKE-1 reactor (first 5 then 20 kW thermal) operated first in Chalk River Laboratories in 1970 and in the University of Toronto 1971-1976. The SLOWPOKE/SLOWPOKE-1 reactor was dismantled in 1976. University of Toronto’s SLOWPOKE-2 reactor (20 kW thermal) operated from 1976 until December 31, 1998. The University of Toronto applied for, and was issued, a Licence to Decommission its SLOWPOKE-2 Nuclear Research Reactor Facility in 2001.[10]
  • The
    AECL's Commercial Products Division (Tunney's Pasture
    - 20 Goldenrod Driveway, Ottawa, Ontario) SLOWPOKE/SLOWPOKE-1 reactor (20 kW thermal) operated 1971-1984. The building that housed it has since been demolished.
  • University of Alberta’s SLOWPOKE-2 reactor (20 kW thermal) operated from April 22, 1977 until being dismantled on August 5, 2017. The University of Alberta applied for, and was issued a Licence to Decommission its SLOWPOKE-2 Nuclear Research Reactor Facility in 2017.[11][12] The U of A SLOWPOKE console is now part of the collection of the Society for the Preservation of Canada's Nuclear Heritage, Inc, in Deep River, Ontario, along with other SLOWPOKE artifacts.
  • Saskatchewan Research Council's SLOWPOKE-2 reactor (16 kW thermal) operated from 1981, until being shut down in December 2017. Decommissioning was expected to be completed sometime in 2020.[13]
  • The SLOWPOKE-2 reactor (20 kW thermal) located in
    MDS Nordion
    , started construction and operation in 1984. It was shut down 1989.
  • The SLOWPOKE Demonstration Reactor (SDR or SLOWPOKE-3; 2-10 MWth) at AECL's
    Whiteshell Nuclear Research Establishment
    operated 1987–1989 (start of construction 1985).
  • The proposed SES-10 (SLOWPOKE-4) reactor was never built.

See also

References

  1. ^ "Retired physicist fights to keep Chalk River's historic research facility open".
  2. ^ "Dr. John W. Hilborn".
  3. ^ "SLOWPOKE Nuclear Reactors in Canada". 4 March 2016.
  4. ISBN 978-1-4597-1056-6
    .
  5. ^ Dunlop, David. "A Canadian Hybrid Submarine Design: A Case for the Slowpoke-2 Reactor". Canadian Naval Review. Canadian Naval Review. Retrieved 4 April 2024.
  6. ^ "Nuclear facility – Royal Military College of Canada SLOWPOKE-2 research reactor". nuclearsafety.gc.ca. Canadian Nuclear Safety Commission. 2014-02-03. Retrieved 2023-09-09.
  7. ^ Royal Military College of Canada SLOWPOKE
  8. ^ "École Polytechnique de Montréal's SLOWPOKE-2" (PDF). Archived from the original (PDF) on 2013-10-16. Retrieved 2013-07-08.
  9. ^ Dalhousie University SLOWPOKE-2
  10. ^ University of Toronto SLOWPOKE-2
  11. ^ "University of Alberta Public Information and Disclosure program". Archived from the original on 2019-12-14. Retrieved 2017-03-12.
  12. ^ "University of Alberta's SLOWPOKE-2". Archived from the original on 2013-10-12. Retrieved 2013-07-08.
  13. ^ Shield, David (4 January 2019). "'It was very unique': Saskatoon's SLOWPOKE-2 research reactor shutting down after 37 years". Canadian Broadcasting Corporation. Retrieved 29 November 2019.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=SLOWPOKE_reactor&oldid=1217272949"