Overview of Pickering NGS Units 1 and 2 Retube Outage

Abstract

After the Pickering NGS Unit 2 pressure tube failure in August 1983 a decision was made in March 1984 to replace all the pressure tubes from both Unit 1 and 2. This retubing was accomplished over a three year period together with a program of inspection, maintenance and modification on other systems. Equipment was put in a short term mothballed state at the commencement of the outage and a thorough recommissioning of all systems, both old and new, was carried out during restart. Details of each component of the outage are described in references (1) through (16). This paper provides an overview of the program highlighting successes and difficulties encountered and recommending changes for future projects of this kind.