NRC Docket No. 50-289

This letter provides additional information regarding the use of the TMI Unit 1 existing missile shield barrier to achieve the prompt closure requirement for the containment equipment hatch opening in the event of a Fuel Handling Accident Inside Containment (FHAIC) during refueling activities, as described in Reference 1. TMI Unit 1 has reevaluated the closure methods for the containment equipment hatch opening and has determined that the existing missile shield barrier will be utilized in lieu of the originally proposed temporary cover design. The commitments regarding the defense-in-depth measures to promptly close the containment equipment hatch opening in the event of an FHAIC remain applicable to the use of the missile shield barrier. Since the missile shield barrier will be utilized to achieve closure of the containment equipment hatch opening in lieu of the original temporary cover, several minor editorial changes to the originally proposed TMI Unit 1 Technical Specification page markups (Reference 2) are provided in Attachment 1. The changes consist of the following: o Clarification to add umissile shield " to Bases page 3-45 inserts. o Clarification to add "as may apply " to Technical Specification 3.8.6 and Bases page 3-45, and add "personnel hatch " to Bases page 3-45, to clarify applicability since the equipmen