June 1 (Reuters) - Exelon Corp :

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* Exelon says Limerick unit 2 is shut

* The 1,150-megawatt plant was operating at full power by early Wednesday, the U.S. Nuclear Regulatory Commission said in a report.

* The company did not say when and why was the unit shut or how long the outage would last Further company coverage: (Reporting By Nallur Sethuraman in Bengaluru and Scott DiSavino in New York)