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We consider the role of quantum effects in the non-perturbative decay ofnon-abelian string with orientational moduli in non-supersymmetric D=4 gaugetheory. To this aim the effective action in the $CP(N-1)$ model on a disc atlarge N has been calculated. It exhibits phase transition at some radius, the"wrong sign" Luscher term and large boundary boojum-like negative contribution.The effect of $\theta$ - term and the possibility of the spontaneous creationof the non-abelian string are briefly discussed.

The CP(N-1) model on a Disc and Decay of a Non-Abelian String