We’ve already had multiple threads discussing this very topic.
There aren’t enough stable coastal sites to build that many nuclear power plants in Taiwan. There is also no sites with stable enough geology for Taiwan to build a underground storage like Finland’s Finland Onkalo storage site.
Also, as demonstrated by Russians in Ukraine, during war time nuclear power plants are easily used as a mean to threaten the safety of those being invaded. The invaders would either occupy the plants and threaten to turn off power, or when they are about to lose control of the plants, threaten to blow them up.
Taiwan could replace all fossil fuel plants with geothermal power, which is a green baseload energy. Taiwan is perfectly situated for developing geothermal, and if the money that had went into NP4 or whatever they plan to do with restarting NP3 went into geothermal, we’d already be making more energy than the 6% nuclear was making.