slightly enriched (1% U-235 fuel pellets, within a CANFLEX 43-element bundle compared to the existing 37-element bundle. In 2006 and 2007, the restart project was judged to be the largest infrastructure project in Canada by ReNew Canada magazine. In April 2007, the auditor general reviewed the refurbishment deal In August 2007, estimated cost for the project had grown to $5.25 billion when Bruce Power decided to replace all 480 fuel channels in Unit 4, which will extend its working life to 2036, in line with the other 3 units of Bruce A. In 2008, due to difficulties developing the necessary robotics, the estimated cost of restarting Units 1 and 2 rose between $400 and $700 million. As of 2008, the project remained on schedule. In January 2010, up to 217 workers were potentially exposed to radiation during the refurbishment. 27 workers may have received 5 mSv, a level well below the level that can affect human health. Only one lab in Canada (at Chalk River) was qualified to do the testing. Bruce Power had to seek permission to use alternative labs. In 2010, a plan to transport decommissioned, low-level radioactive steam generators to Sweden via the Great Lakes caused controversy. The CNSC approved the plan in February 2011. As of January 2011, fuel channel installation in Unit 2 was complete. The CNSC gave the operator the green light to restart Unit 2 on 16 March 2012. However, the reactor was shut down the next day after a leak was discovered in the moderator system. In 2011, refurbishment of Unit 1 and 2, scheduled to be complete 2009, was predicted for 2012. In 2011, the cost had totaled $3.8 billion; the final cost was expected to be $4.8 billion. The original 2005 estimate was $2.75 billion. In September 2012, Unit 1 began generating power again. On 16 October 2012, Unit 2 was connected to the provincial electricity grid for the first time in 17 years. In 2013, final costs were estimated at $4.8 billion, up from an original estimate of $2.75 billion, and the project ran "far behind" schedule. Refurbishment of Units 3–8, 2016–present In October 2013, under the Ontario Long Term Energy Plan (LTEP) 2013, Ontario announced plans to refurbish six reactors at the Bruce plant beginning with Bruce A4 in 2016. Other units would follow at intervals. Bruce Power estimated the cost at about $2 billion per unit, or