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February 2011

It’s been another busy year for the SCAPA.  Members of the Chemical Exposure Working Group published the latest revision of the Protective Action Criteria/ Temporary Emergency Exposure Limits (PAC/TEEL) data set.  “PAC Revision 26” was published in September 2010.   PAC Rev 26 provides protective action information for several new chemicals and updates for a significant percentage of the chemicals in the data set.  See the PAC/TEEL webpage for a link to the PAC/TEEL data set and associated documentation.  The data set is provided in three different formats: an Excel workbook, formatted data tables, and a searchable database.  

Steady progress continues to be made in the multi-year effort to update all the chemicals in the PAC data set.   An external technical review committee’s recommendations to improve the development methodology for TEELs have been reviewed by NA-41 and the TEEL Advisory Group (TAG).  Some modifications in the TEEL methodology will likely start to be incorporated in the next version of the PAC (Rev 27).

The Chemical Mixtures Working Group is publishing the next revision of the Chemical Mixture Methodology (CMM).  The new CMM data set (also called “Revision 26” to emphasize its compatibility with PAC Rev 26) will be published in February 2011. Please see the CMM webpage for a link to the CMM Rev 26 data set and its user’s guide.

A multi-year year effort to review and update all the HCN data in the CMM database is nearing its completion.  CMM Rev 26 contains updated HCN values for another thousand chemicals; as a result, 70% of the chemicals in the CMM now have updated HCN values.  HCN values for the final thousand chemicals in the CMM data have been generated and are currently undergoing quality assurance reviews.  CMM Rev 27 will therefore present updated HCN values for the all the chemicals in the data set.  A journal article on the CMM and the HCN development methodology was published in the the Journal of Applied Toxicology in August 2010 (see

The Consequence Assessment Modeling Working group began working with the SCAPA Software Quality Assurance (SQA) guidance document in 2010.  This guidance provides an important supplement to the existing DOE Order and Guide that cover SQA for safety software. Working group members are conducting an SQA gap analysis on key safety-related consequence assessment models used in the DOE complex.  A revised SCAPA modeling toolbox containing the first few models to pass the SCAPA SQA gap analysis will be released in 2011.  The toolbox will provide a list of models that currently adhere to the SCAPA’s SQA guidance.

The Biosafety Working Group is addressing a number of issues related to emergency preparedness and response.  The working group is maintaining a formal alliance with the American Biological Safety Association (ABSA) and is sharing information on the ways DOE/NNSA sites are addressing biosafety issues.  Members of the working group are participating on Federal Experts Security Advisory Panel (FESAP) working groups that were convened by NIH and the United States Department of Agriculture (USDA) to follow up on Executive Order 13546, “Optimizing the Security of Biological Select Agents and Toxins in the United States.”

The Source Term Working Group met a number of key milestones in 2010.  It published a paper, Applicability of the TRU Standard Statistical MAR Approach in Emergency Planning Hazards Assessments, which is posted on the EMI SIG’s FAQ website.  The working group is wrapping up an assessment of the dose impacts of non-respirable sources and is also addressing other technical questions.  

The 2011 EMI SIG Annual Meeting (which includes the annual SCAPA meeting), was held May 2-5, 2011, in Charleston, SC at the Charleston Marriott.  The hotel is conveniently located near historic downtown area with easy access to the Charleston airport.  Situated along the picturesque Ashley River, the hotel is very close to the campus of the Citadel, and a short distance from downtown. 

Rooms at the meeting site can be reserved online or by calling the Charleston Marriott at 800-968-3569 or 843-723-3000. Persons calling for reservations should identify themselves as EMI SIG members. The room rate is $132 per night plus $16.50 tax. The deadline to make hotel reservations is April 7, 2011; however, reservations should be made as soon as possible to ensure the government per diem group rate.

Following last year’s formula, the SCAPA annual meeting will be held on Monday afternoon.  SCAPA working groups will meet at various times on Tuesday and Wednesday during breaks in the EMI SIG Meeting schedule. On Tuesday evening, SCAPA will hold its traditional dinner – always an enjoyable culinary adventure!  

For those unfamiliar with Charleston, it is the oldest city in South Carolina (founded in 1670). Charleston is a major tourist destination and is recognized as one of “best-mannered cities” in the country.  The city is located at the confluence of the Ashley and Cooper rivers, and historic Fort Sumter is located in the harbor.  Numerous steeples dot the city's picturesque skyline.  The Downtown area features lots of award winning restaurants, and there is plenty to see and do in town and in neighboring areas.