I agree that it is not listed as supported. From what I see about NAP it appears that it logs to the standard Event Logs. For example, there is information listed on technet with the EventID's - http://technet.microsoft.com/en-us/library/dd320180(v=ws.10).aspx I did search through our current Windows Events in the Policy Editor and turned up one rule with SigID 43-323002040 which is for "User did not meet requirements of Network Access Protection policies".
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