Analysis of design changes and modifications to enhance safety margins at KANUPP - a PAEC/NSS team effort

Accident analysis for revision of the Karachi Nuclear Power Plant Final Safety Analysis Report has been completed by a cooperative effort between the Pakistan Atomic Energy Commission and Nuclear Safety Solutions. The revision was created to assess design changes and modifications which had been implemented in the plant to support life extension and enhance safety margins. The enhancements were primarily related to safety system response following loss of coolant accident scenarios. In addition, the revision of the safety report included updates to two dual failure accident sections, loss of coolant coincident with loss of emergency injection water, and loss of reactivity control coincident with loss of protection, which had been a part of the original safety report. The paper provides an overview of the design changes which have been implemented and a summary of the updated safety analysis. The new analysis supports full power operation. (author)