Hi,
I don’t found some document you can safe delete the NULL column, by default, NPS does not log any data until you configure it to do so. Initially, it is recommended that you
enable the logging of accounting and user authentication requests. You can refine your logging settings after you determine your required data.
To limit the size of each log file, click When log file reaches this size, and then type a file size, after which a new log is created. The default size is 10 megabytes (MB).
The related KB:
The Cable Guy: The New and Improved Network Policy Server
http://technet.microsoft.com/en-us/magazine/ff943567.aspx
Configure NPS Log File Properties
http://technet.microsoft.com/en-us/library/ee663944(v=ws.10).aspx
Hope this helps.
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