This report was .prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or assumes a n y legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by t h e United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. Summary As part of its ongoing efforts to reduce doses to workers to levels as low as reasonably achievable (ALARA), Westinghouse Hanford Company (WHC) tasked the Health Protection Department of the Pacific Northwest Laboratory (PNL) to review operations at the 105 K-East Fuel Storage Basin (105 K-East). This review included both routine operations and a proposed campaign to encapsulate N-Reactor fuel stored there. This report summarizes the results of PNL's reviews of policy, procedures, and practices for operations at 105 K-East as well as an evaluation of the major sources of occupational radiation exposures. Where possible, data previously collected by WHC and its predecessors were used. In addition, PNL staff developed a threedimensional model of the radiological environment within 105 K-East to assess the relative contributions of different radiation sources to worker dose and to provide a decision tool for use in evaluating alternative methods of dose rate reduction. The model developed by PNL indicates that for most areas in the basin the primary source of occupational radiation exposure is the contaminated concrete surfaces of the basin near the waterline. Basin cooling water piping represents a significant source in a number of areas, particularly the Technical Viewing Pit. This report contains specific recommendations to reduce the impact of these sources of occupational radiation exposure in 105 K-East. Other recommendations to reduce doses to workers during activities such as filter changes and filter sampling are also included. .

Atlanta,3490 PiedmontGA 30305Road' NE-Suite 1410 MASTER DISTRIBUTION OF THIS DOCUMENT 18 UNLIMITE.I_ Use of N UREG-1400 by Licensees This report, NUREG-1400, was written to provide technical information to licensees using Regulatory Guide 8.25, Revision 1, 'Air Sampling in the Workplace." The report was reviewed by the U.S. Nuclear Regulatory Commission (NRC) staff for its technical content. NUREG-1400 is not and should not be used as a regulatory compliance document, because it neither establishes regulatory positions nor defines what is acceptable to the NRC. For the case in which a licensee has made a commitment to conduct air sampling in accordance with the recommendations in Regulatory Guide 8.25, NUREG-1400 should not be used in compliance reviews to determine whether the recommendations have been followed. Instead, NUREG-1400 is a technical resource for the licensee to use to obtain technical information when information is wanted. Regulatory Guide 8.25 specifically states that the guide does not apply to activities conducted under 10 CFR Part 50 at reactor facilities, however, NUREG-1400 provides examples of reactor facilities to demonstrate all types of air sampling programs.

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