Actuator system history of safety rod lower latch problems review of latch inspection video tapes Metadata

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  • Main Title Actuator system history of safety rod lower latch problems review of latch inspection video tapes


  • Author: Banks, J. J.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: DOE; USDOE, Washington, DC (United States)


  • Name: Westinghouse Savannah River Company
    Place of Publication: Aiken, South Carolina
    Additional Info: Westinghouse Savannah River Co., Aiken, SC (United States)


  • Creation: 1992-06-24


  • English


  • Content Description: During pre-restart testing the safety rod at position X26-YlO bound after being driven approximately two (2) feet out of the reactor. Subsequently, the rod was manually returned to it's seated position. Inspection of the lower latch showed that the latch locking plunger button (screwed on to the bottom of the plunger shaft and retained by a pin through a hole drilled through the button and the plunger shaft) was missing. The shaft failed through the hole drilled for the retaining pin. The button, with the retaining pin intact, was found lodged between the safety rod upper adapter collar and the top of the safety rod thimble top fitting. Analysis of the safety rod latch and accompanying forest guide tube design provided assurance that this type of failure would not cause binding during the scramming'' of the safety rods. Inspection of all of the K'' safety rod lower latches revealed six other latches with missing plunger buttons, and nine with other non-conformances which required latch replacement. A history search conducted by Reactor Engineering Design, Components Handling Group, is included in this report. The history search shows that latch design modifications, as a part of initial development of the latch system and later to improve the delatching operation, were made from 1950 to 1960. These modifications created a condition where latch damage could occur. Video tapes were made during inspection of the safety rod latches in K area and control rod latches in L area. These tapes were reviewed by Reactor Engineering Design Components Handling engineers. The reviews were used for correlation of latch problems reported by the engineers/mechanics making the inspections. The K area tapes showed inspection of 65 of the 66 safety rod latches. The review of the tapes showed the plunger buttons to be missing from five latches. RED-CH reviewed the L Area video taped inspection of 35 control rod clusters (245 latches). No non-conformances were noted.
  • Physical Description: Pages: (18 p)


  • Keyword: Reactor Start-Up
  • Keyword: Magnetic Tapes
  • Keyword: Magnetic Storage Devices
  • STI Subject Categories: 220600 -- Nuclear Reactor Technology-- Research, Test & Experimental Reactors
  • Keyword: Reactor Components
  • STI Subject Categories: 22 General Studies Of Nuclear Reactors
  • Keyword: Video Tapes
  • Keyword: Start-Up 220900* -- Nuclear Reactor Technology-- Reactor Safety
  • STI Subject Categories: 21 Specific Nuclear Reactors And Associated Plants
  • Keyword: Control Elements
  • Keyword: Investigations
  • Keyword: Electrical Equipment
  • Keyword: K Reactor
  • Keyword: Reactor Operation
  • Keyword: Reactivity Insertions
  • Keyword: Scram Rods
  • Keyword: Failures
  • Keyword: Production Reactors
  • Keyword: Reactors
  • Keyword: Safety
  • Keyword: Reactor Safety
  • Keyword: L Reactor
  • Keyword: Connectors
  • Keyword: Operation
  • Keyword: Memory Devices
  • Keyword: Special Production Reactors
  • STI Subject Categories: 220400 -- Nuclear Reactor Technology-- Control Systems
  • Keyword: Actuators
  • Keyword: Equipment
  • Keyword: Heavy Water Moderated Reactors
  • Keyword: Conductor Devices
  • Keyword: Administrative Procedures


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Other: DE92019920
  • Report No.: WSRC-TR-92-42-003
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/7232872
  • Office of Scientific & Technical Information Report Number: 7232872
  • Archival Resource Key: ark:/67531/metadc1444117


  • Display Note: OSTI; NTIS; GPO Dep.