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On September 19, 2014, -during refueling outage 01R26 with the unit in cold shutdown, a technician discovered that a previously authorized and installed Temporary Configuration Change (TCC) had been removed from a penetration in the Outboard Main

• Steam Isolation Valve Room (Trunnion Room). The purpose of the TCC is to Isolate the penetration from the Reactor Building (RB) to the Trunnion Room to allow the RB Trunnion Room door to be maintained open during refueling outages. Per Technical Specifications (TS) 3.5.8 and 4.5.G, in order to maintain secondary containment integrity with the Trunnion Room door open, four -1 penetrations connecting the Trunnion Room to the RB must be seated. The Trunnion Room door was open when the phi() was found removed from a 6" equipment drain hub. The plug was immediately reinstalled. On September 20, 2014, the Post Maintenance Testing (PMT) for the TCC reinstallation was executed in order to declare secondary containment operable. This PMT revealed that the Standby Gas Treatment System (SBGTS) could not achieve the required minimum differential pressure of - 0.26° water vacuum on the RB. The cause was determined to be an improperly latched personnel access hatch on'the Outer Reactor Building Airlock Door.

ENS 50476 was submitted on September 20, 2014. This issue is reportable under 10 CFR 60.73(a)(2)(v)(C) as an event that could have prevented the fulfillment of the safety function of a system needed to control the release of radioactive material, and 10 CFR 50.73(a)(2)(I)(8) as a condition which was prohibited by the OM'S Technical Specifications.