1.  Bar pursuant to written waiver.  A disclaimer is barred by a written waiver of the right to disclaim.  

2.  Bar pursuant to events.  A disclaimer of an interest in property is barred if any of the following events occur before the disclaimer becomes effective:  

3.  Previous exercise not a bar to disclaimer of power held in fiduciary capacity.  A disclaimer, in whole or part, of the future exercise of a power held in a fiduciary capacity is not barred by its previous exercise.  

4.  Previous exercise not a bar to disclaimer of power not held in fiduciary capacity; exception.  A disclaimer, in whole or part, of the future exercise of a power not held in a fiduciary capacity is not barred by its previous exercise unless the power is exercisable in favor of the disclaimant.  

5.  Bar pursuant to law.  A disclaimer is barred or limited if so provided by law other than this Part.  

6.  Effect of bar.  A disclaimer of a power over property that is barred by this section is ineffective. A disclaimer of an interest in property that is barred by this section takes effect as a transfer of the interest disclaimed to the persons who would have taken the interest under this Part had the disclaimer not been barred.