Editing Manhattan Project (section)

==== Ontario ====
The [[Chalk River Laboratories|Chalk River, Ontario]], site was established to rehouse the Allied effort at the [[Montreal Laboratory]] away from an urban area. A new community was built at [[Deep River, Ontario]], to provide residences and facilities for the team members. The site was chosen for its proximity to the industrial manufacturing area of Ontario and Quebec, and proximity to a rail head adjacent to a large military base, [[Camp Petawawa]]. Located on the Ottawa River, it had access to abundant water. The first director of the new laboratory was [[Hans von Halban]]. He was replaced by John Cockcroft in May 1944, who was succeeded by [[Bennett Lewis]] in September 1946. A pilot reactor known as [[ZEEP]] (zero-energy experimental pile) became the first Canadian reactor, and the first to be completed outside the United States, when it went critical in September 1945; ZEEP remained in use by researchers until 1970.<ref>{{cite web |url=http://www.sciencetech.technomuses.ca/english/whatson/zeep.cfm |archive-url=https://web.archive.org/web/20140306233719/http://www.sciencetech.technomuses.ca/english/whatson/zeep.cfm |archive-date=6 March 2014 |title=ZEEP – Canada's First Nuclear Reactor |publisher=Canada Science and Technology Museum}}</ref> A larger 10&nbsp;MW [[NRX]] reactor, which was designed during the war, was completed and went critical in July 1947.<ref name="Waltham, pp. 8-9" />