As per reports, 3 persons died after nitrogen gas leak at a reactor construction site. Government closed two more sites under construction following this incident.
I feel that this reaction is not warranted, in this case. Persons overcome by inert gases is well known. Closure of the site where deaths took place is reasonable to isolate as well as enable investigation.
One need not be afraid that all accidents at a nuclear site involve nuclear material. If one thinks that all nuclear sites where nitrogen is used should be closed, then all industrial facilities (nuclear and others) handling nitrogen should be closed, which is not sensible.
http://rt.com/news/217967-korea-nuclear-deadly-leak/