Structural walkdown procedure for natural phenomena engineering analyses at the Oak Ridge Y-12 Plant

This walkdown plan outlines the process to be followed and the pertinent structural information to be collected for the assessment of the adequacy of existing or future natural phenomena analyses for the Oak Ridge Y-12 Plant. This approach is being followed in order to develop input to assess that the critical facilities were constructed in accordance with the design drawings, that any major configuration changes to the principle structures are identified and that the location of major equipment loadings are defined. This structural walkdown plan is not intended to collect detailed information for the purpose of developing as-built structural drawings or to evaluate equipment or safety system/component interaction. Implementation of this plan is required for the walkdown phase of the Y-12 Plant natural phenomena analyses. The types of walkdowns to be performed in this procedure include: (1) A walkdown based on a sampling approach to collect detailed structural design information relative to member sizes, orientation, connection, and base details to support the conclusion that the structural configuration is consistent with the design drawings. (2) A walkdown to collect detailed information relative to equipment loadings on top and bottom of floors and roof. (3) A walkthrough inspection of all areas of the building to identify any areas of major configuration change from design drawings. Basic floor loading information such as size, location, and weight is to be obtained. Actual dead loads and live loads are to be determined. Floor load drawings will be developed to show the location, weights, etc., for major dead and live loads. One walkdown package will be generated for each of the following Y-12 Plant structures: Buildings 9212, 9980, 9996, 9723-25, 9828-1, 9828-2, 9828-3, 9767-10, 9812, 9815, 9818, 9999, 9423. The justification for these walkdowns is the potential for release of radioactive and/or other hazardous materials