The non-consistent and observation items found in the internal and external re- views on the operation of environmental and occupational health & safety management sys- tem in NPIC during 2013 to 2015 have been summarized in this paper. The problems were statistically summarized, classified and analysed using the method of Pareto Chart and fish- bone diagram. The basic factors which influence the operation of EHS management system in NPIC were found. The improvem...