amendments to regulation of new and existing chemical substances registration draft the toxic chemical substances control act tcsca was amended and promulgated on 11 december 2013. pursuant to tcsca the subordinate implementing law regulation of new and existing chemical substances registration and management was enacted on 11 december 2014. this proposal aims to update the provisions under the regulation of new and existing chemical substances registration. major amendments are as follows harmonizing the information requirement between the environmental protection administration epa and the ministry of labour regarding hazard assessment and exposure assessment issuing the registration number instead of the registration document for the approved registration clarifying the quantity that triggers the obligation of the existing chemical substance phase 1 registration. for an existing chemical substance manufactured or imported in the annual volume of 100 kilograms or more the phase 1 registration must be made within 6 months. also a voluntary phase 1 registration may be made for the existing chemical substance manufactured or imported in an annual volume of less than 100 kilograms clarifying the period of confidentiality of information on chemical substances included in the inventory of existing chemical substances and ensuring consistency in the period of the information confidentiality and the validity of registration approval requiring an annual report on new and existing chemical substances registered and approved indicating the calculation of the review period that the review period is calculated anew upon the registrants supplementation or correction to the registration application extending the limit on the time period and the number of times that supplementations and corrections may be made for a registration application by the epa taking into account the scientific and technical feasibility accepting written appeals with stated reasons for which the registrant may have concerns over the review results deleting outdated provisions.