In January 1943 the Cambridge team including Nunn May transferred to the Montreal Laboratory which was building a reactor at Chalk River near Ottawa, Canada.
In the summers of 1946 and 1947, he worked on the Canadian nuclear power project in Chalk River, Ontario.
He supervised the construction of Canada's first nuclear reactor (ZEEP) at the Chalk River Laboratories in 1945.
(The other half of the 1994 Nobel Prize for Physics went to Bert Brockhouse for development of the inelastic scattering technique at the Chalk River facility of AECL. This also involved the invention of the triple axis spectrometer).
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In 1944, he took charge of the Canadian Atomic Energy project and became Director of the Montreal Laboratory and Chalk River Laboratories, replacing Hans von Halban, who was considered a security risk.