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

A disclaimer of an interest in property is barred if any of the following events occur before the disclaimer becomes effective:

1. (a)
   The disclaimant accepts the interest sought to be disclaimed;
2. (b)
   The disclaimant voluntarily assigns, conveys, encumbers, pledges, or transfers the interest sought to be disclaimed or contracts to do so;
3. (c)
   The interest sought to be disclaimed is sold pursuant to a judicial sale; or
4. (d)
   The disclaimant is insolvent when the disclaimer becomes irrevocable.

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

A disclaimer, in whole or in 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.

A disclaimer of an interest in, or a power over, property which is barred by this section is ineffective.