Interestingly, this is the second time the reactor has been shut down in a month. The first time was on August 22 following a leak caused by "micro-cracks" in a diaphragm in a pressurized heater bundle within the containment barrier.<p><a href="http://www.whptv.com/news/local/story/UPDATE-3-Thursdays-TMI-shutdown-is-the-second-in/_Z1vYirDt0ybASp0FZhmUw.cspx" rel="nofollow">http://www.whptv.com/news/local/story/UPDATE-3-Thursdays-TMI...</a>