Attachment_2_-_Drawings.pdf

This document is a technical engineering drawing and modification specification for the Unit 2 Turbine Guide Bearing RTD (Resistance Temperature Detector) modification at Folsom Powerplant, operated by the Bureau of Reclamation, U.S. Department of the Interior, as part of the Central Valley Project's American River Division.

The modification involves relocating the existing RTD temperature sensor from its current location on the downstream/river split line to a new location on the upstream/bank split line of the turbine guide bearing. Key work requirements include: drilling a 1-inch through hole for the new RTD mount; fabricating a solid plate to replace the existing site glass retainer; installing a new RTD head mount assembly with a 12-inch NPT fitting and associated hardware; making bends in a new 14-inch RTD line to run from the bearing to the head mount; and removing the existing site glass. The modification specifies use of (4) 3/8-inch Grade 5 hex bolts and (4) 1/4-inch Grade 5 hex bolts for fastening the fabricated components. Technical details include multiple dimensional specifications and sectional views (Sections A-A, B-B, C-C, and D-D) illustrating the bearing cover configuration, mounting interfaces, and RTD routing. The drawing was prepared by J. Vincent and last saved on November 7, 2025, using AutoCAD 25.0S. The project is identified as drawing number 485-218 with a status designation marked as draft and not for distribution.