Section 117.170 - Reanalysis(a) You must conduct a reanalysis of the food safety plan as a whole at least once every 3 years;(b) You must conduct a reanalysis of the food safety plan as a whole, or the applicable portion of the food safety plan: (1) Whenever a significant change in the activities conducted at your facility creates a reasonable potential for a new hazard or creates a significant increase in a previously identified hazard;(2) Whenever you become aware of new information about potential hazards associated with the food;(3) Whenever appropriate after an unanticipated food safety problem in accordance with § 117.150(b) ; and(4) Whenever you find that a preventive control, combination of preventive controls, or the food safety plan as a whole is ineffective.(c) You must complete the reanalysis required by paragraphs (a) and (b) of this section and validate, as appropriate to the nature of the preventive control and its role in the facility's food safety system, any additional preventive controls needed to address the hazard identified:(1) Before any change in activities (including any change in preventive control) at the facility is operative; or(2) When necessary to demonstrate the control measures can be implemented as designed: (i) Within 90 calendar days after production of the applicable food first begins; or(ii) Within a reasonable timeframe, provided that the preventive controls qualified individual prepares (or oversees the preparation of) a written justification for a timeframe that exceeds 90-calendar days after production of the applicable food first begins.(d) You must revise the written food safety plan if a significant change in the activities conducted at your facility creates a reasonable potential for a new hazard or a significant increase in a previously identified hazard or document the basis for the conclusion that no revisions are needed.(e) A preventive controls qualified individual must perform (or oversee) the reanalysis.(f) You must conduct a reanalysis of the food safety plan when FDA determines it is necessary to respond to new hazards and developments in scientific understanding.