Accelerator Safety Workshop SLAC John Blaikie Health Physics Program Manager – SC Office of Science, U.S. Department of Energy Access Control and Posting Issue Break-out Session August 17-19, 2010 OFFICE OF SCIENCE

2 Rules of Engagement  First Rule – No “hitting”  Second Rule – When someone else has the floor, please let that person finish  Third Rule – Please follow rules 1 and 2

Outline of Session  Site representative reports – 3 minutes each  Comments from HSS  Comments from GC  Review excerpts from guidance  Open discussion  Outcome –Agree on extent of condition –Determine what to report back to group via general consensus of the group. –Remaining issues highlighted/captured (Parking Lot) 3

DOE Guidance DOE G C, Radiation Protection Programs Guide for Use with Title 10, Code of Federal Regulations, Part 835, Occupational Radiation Protection  Areas with entrance or access points consisting of locked doors or other controls and interlocks... should be considered accessible to individuals. ... areas with entrance or access points consisting of doors or portals... that are bolted or otherwise more permanently sealed, may be considered inaccessible... 4

DOE Guidance DOE G C, Radiation Protection Programs Guide for Use with Title 10, Code of Federal Regulations, Part 835, Occupational Radiation Protection ... areas with entrance or access points that require the use of tools or lifting or excavation equipment to gain access may be considered inaccessible... ... these entrance or access points should be marked indicating the radiological hazard that exists...  In lieu of or in addition to such markings, physical controls (e.g., physical barriers, entry alarms) and/or administrative controls (e.g., procedural controls, additional training) should be implemented as necessary to prevent unauthorized or inadvertent entry to the area or exposure of the hazard. 5

6 DOE Guidance DOE G Accelerator Safety Order Guide  An exclusion area is an area that is locked and interlocked to prevent personnel access while the beam is on.  A fully enclosed and interlocked area is considered inaccessible.

Access and Posting General Questions 1.Are ALL doors or potential access points posted with Radiation, High Radiation or Very High Radiation Area signs? (Yes / No) 2.Are there access points the site considers to be inaccessible during accelerator operations? (Yes / No) 3.Are these access points that are considered inaccessible, posted with Radiation, High Radiation or Very High Radiation Area signs? (Yes / No) 4.How does your facility interpret accelerator and beam line housing/shielding when your Access Control System is activated? (Accessible / Inaccessible) 7

Other Points of Discussion 1.How do people gain access to potential Very High Radiation Areas at your facility? 2.What do you consider to be “inaccessible”? 3.Should the words "Grave Danger, Very High Radiation Area" be used at entry points to accelerators, beam lines, housings, hutches, etc, at your facility where the dose rate can meet the 10CFR835 definitions? 4.Discuss the pros and cons of interpreting the regulations such that accelerator enclosure/shielding access points are considered “accessible to personnel” regardless of controls and interlocks. What would be involved with systems' upgrades, personnel training, etc? 8