The escalation of North Korea’s nuclear and missile capabilities has brought home to us the urgency and necessity of building a nuclear protection system at the national level. The necessity, importance, and justification for the establishment of the nuclear protection system to ensure the lives and safety of the people and to minimize damage are increasing. Accordingly, this study aims to establish a national nuclear protection system against the growing North Korea’s nuclear threats. This study uses THIRA techniques in the USA’s FEMA and a likely nuclear damage scenario, and TC, TCL. Each TCL Level has proposed reasonable measures to ensure survival and minimize damages. It also proposes ways to overcome limited resources and to use the developed military capability, thereby making it possible to save resources. This helps decision-making on the priorities and direction in the future at the national level.