Materials testing reactor

Short description: High-flux research nuclear reactor

Not to be confused with the Materials Testing Reactor, an early reactor that operated in Idaho from 1952 to 1970.

A materials testing reactor (MTR) is a high-flux research nuclear reactor aimed at studying materials exposed to a high neutron flux.

## Contents

* 1 United States
* 2 Other Examples
* 3 See also
* 4 References
* 5 External links

## United States

The first Materials Testing Reactor (MTR), was designed jointly by Oak Ridge National Laboratory and Argonne National Laboratory and operated in Idaho from 1952-1970.[1][2]

## Other Examples

Materials testing reactors include:

* BR2, the Belgian Reactor 2, moderated with a paraboloid beryllium matrix, in operation at SCK CEN since 1962.[3]
* Dounreay Materials Testing Reactor, a Dido class reactor in the United Kingdom.
* ETRR-2, at the nuclear research center in Inshas, Egypt.
* Jules Horowitz Reactor, under construction at the Cadarache nuclear facility in southern France.[4]
* Research reactor in Petten, the Netherlands.
* Pakistan Institute of Nuclear Science & Technology (PINSTECH) in Pakistan.
* Reactor Technology Complex of the Idaho National Laboratory in Idaho, United States.
* RV-1 nuclear reactor in Venezuelan Institute for Scientific Research, Venezuela.
* SAFARI-1, outside of Pretoria, South Africa, also used to produce medical isotopes.
* RSG G.A Siwabessy in Serpong, Indonesia
* Japan Material Testing Reactor (1968 to 2021).[5]
* Washington State University Reactor (1961 to 1967)

## See also

* List of nuclear reactors
* Nuclear research reactors

## References

1. ↑ Studsvik, A message from; PacTec, A message from (2025-07-25). "The MTR—Gone now, but not forgotten". https://www.ans.org/news/article-1184/mtr-gone-now-but-not-forgotten/.
2. ↑ "Materials Testing Reactor". Physics Today 5 (6): 27–28. 1952-06-01. doi:10.1063/1.3067632. ISSN 0031-9228. https://digital.library.unt.edu/ark:/67531/metadc172781/m2/1/high_res_d/metadc172781.pdf. Retrieved 2025-07-25.
3. ↑ Baugnet, J.M.; Roedt, Ch. de; Gubel, P.; Koonen, E. (2025-01-14). "The BR2 materials testing reactor. Past, ongoing and under-study upgradings". p. 34–34. https://inis.iaea.org/records/7kp3a-pnt04.
4. ↑ "Jules Horowitz Materials Testing Reactor (JHR)". 2024-01-10. https://rinconeducativo.org/en/recursos-educativos/jules-horowitz-materials-testing-reactor-jhr/.
5. ↑ "Japan Atomic Energy Agency Oarai Nuclear Engineering Institute". https://www.jaea.go.jp/04/o-arai/en/research/research_02.html.

## External links

* Ne.anl.gov: MTR Reactors designed by the Argonne National Laboratory
* Docs.google.com: Materials Testing Reactor

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