Aug 28 (Reuters) - Keyera Corp KEY.TO :
* KEYERA CORP - HAD UNPLANNED OUTAGE AT WAPITI GAS PLANT THAT BEGAN ON AUG 17
* KEYERA CORP - UNPLANNED OUTAGE AT WAPITI GAS PLANT DUE TO FAILURE OF WASTE HEAT RECOVERY SYSTEM
* KEYERA CORP - IS INVESTIGATING ROOT CAUSE OF OUTAGE, & ASSESSING ANTICIPATED DURATION & CORRESPONDING COST OF REPAIR