1. Accelerator Safety Workshop SLAC John Blaikie Health Physics Program Manager – SC- 31.1 Office of Science, U.S. Department of Energy Access Control and Posting Issue Break-out Summary August 19, 2010 OFFICE OF SCIENCE

2. 2 Issue Review  Statement of issue –Posting requirements during accelerator operations –There is no issue with posting while accelerator is NOT operating –Issue was identified at TJNAF during a 10 CFR 835 Review –Is enclosure considered accessible during accelerator operations  Discussion –Reviewed posting guidance –Reviewed practices at each site –Attempted to determine extent of conditions

3. Talking Points  GC – How would you post? Post for legitimate allowable entry  Do not want to dilute significance of radiological postings by over-posting  Define accessibility probability when beam is on  What resolution provides the best long-term solution—define end state—best for DOE—what makes sense that is reasonable, credible state for requirement  What is a defensible solution and the path to get there and the best bang for the buck?  Conditional posting would meet requirement for 10CFR835. Could not agree on whether “beam on” light is required at EVERY door. Conditional posting would not work at all facilities 3

4. Talking Points  Need to determine if we are NOT in compliance—break-out group was only one- fourth of workshop—need to determine who else would be affected  Possible resolution—amend 835—exemption request  Are we expecting contractors to self-ID and file NTS? 4

5. Outcome  TJ issued finding for not posting IAW 10CFR835  All sites represented in break-out acknowledged they post the same way  GC representative does not agree that the enclosure doors can be legally described as inaccessible—subject to further discussions at HQ  GC has first draft of official guidance—has agreed to delay issuance to allow sites time to review and assess issue.  We know there is DOE issued conflicting guidance  Need to advise management of potential issue  HS & SC to discuss with Enforcement  DOE HQ needs to provide official guidance 5