Items are classified as either Category IA or IB at the time they are created in order to fix the frequency of tests for item loss. The inspector should tour the item storage areas to review the Category IB items and determine whether the items have been appropriately classified. Evaluation of Item Monitoring Procedures and Instructions . The inspector should determine whether the number of items verified by the licensee is sufficient to give a power of detection of at least 99 percent for a loss of items totaling 5 FKG from each stratum or inventory subdivision. The inspector should check how the window is established for the test including start time and criteria for completion.
Specific considerations are weekends and holidays.
The inspector can check the licensee's sampling plan by independently calculating the sample size for ten percent of the tests performed in the period since the last inspection. The item inventory should be stratified or subdivided by the licensee in a manner that assures at least a 99 percent power of detection while minimizing the number of items to be verified. It is advantageous to subdivide the inventory into classes or strata having approximately uniform quantities of SSNM per item. A moderate range of SSNM contents within a class, such as 10 to 20 percent, is usually acceptable. Typical classes for sampling are fuel elements, containers of scrap, containers of feed material, containers of waste, etc.