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Safety Document Development at the Spallation Neutron Source

Safety Document Development at the Spallation Neutron Source. Donald C. Gregory, PhD, CHP Oak Ridge National Laboratory (with invaluable input from Mike Harrington). Proton Machine, Mercury Target, Instruments, and Office Building - One Accelerator Facility. SAD Requirements and Purpose.

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Safety Document Development at the Spallation Neutron Source

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  1. Safety Document Development at the Spallation Neutron Source Donald C. Gregory, PhD, CHP Oak Ridge National Laboratory (with invaluable input from Mike Harrington)

  2. Proton Machine, Mercury Target, Instruments, and Office Building -One Accelerator Facility

  3. SAD Requirements and Purpose • Accelerator Safety Order (DOE O 420.2B) specifies requirements in Sections 4.a., parts (1) through (6) – about ½ page • ASO Guide (DOE G 420.2-1, 7-1-05) outlines a 7 chapter format • Primary purpose of SAD – provide a clear basis for the Accelerator Safety Envelope • The SAD also helps: • Document/Communicate your safety approach • Ensure buy-in of ops, physics, engineering

  4. The SNS SAD grew with the Project • The SAD documented safety at each stage as the project commissioned in sections • The SAD was developed by the Project team • Project/Design personnel provided the descriptions of facilities and operations • Safety specialists guided the hazard analyses • Project personnel were given specific writing assignments • Credited Engineered Controls designated critical safety equipment at each stage

  5. Decisions • Level of Detail • Descriptions must be clear, but not binding unless essential to safety • Hazards • Radiological (certainly) • ODH (commonly) • Hazardous/Toxic materials (e.g., SNS mercury) • Standard Industrial hazards (NO!) • Which accidents to analyze • Possibility of serious injury/death • Where Codes and Standards are inadequate • SAD Updates come from USIDs

  6. SAD Reviews are Important! • SNS Accelerator Safety Review Committee provided the primary review • Highly respected, nationally recognized experts • DOE Project Director approval was written into the Project Execution Plan • Not required by 420.2B • DOE active participation ensures agreement, and sets up approval of the ASE • USIDs keep everyone up to date • 38 at SNS since 2004

  7. Accelerator Safety Envelope • The ASE documents the limits of safe operation • Activities violating the ASE must cease immediately, and not recommence before DOE is notified • Include power limit, needed CECs • Beware of including elements which do not meet this standard • ASE should flow from the SAD hazard analysis • Be sure the meaning of “operable” is clear • The Operating Envelope provides an operational buffer from the ASE limits

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