Sorry about the trouble you have been experiencing with your NUC system and Mac Os.
Please bear in mind that your Intel NUC system is compatible with win7, win8 and win8.1.
I may say that this problem is caused due to operating system compatibility.
For information about supported operating systems go here: http://www.intel.com/support/motherboards/desktop/sb/CS-034034.htm
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Even though the MAC OS is not a supported operating system for Intel NUCs, I do know that it has been installed. There is a very good write-up about how one person did it at Hackintosh with Intel Haswell NUC - theV.net. You might find some answers there.