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Digital I&C System in the US-APWR

[+] Author Affiliations
Hiroshi Shirasawa, Shunsuke Ishimoto, Kenji Mashio

Mitsubishi Heavy Industries, Ltd., Kobe, Japan

Paper No. ICONE16-48220, pp. 977-982; 6 pages
  • 16th International Conference on Nuclear Engineering
  • Volume 3: Thermal Hydraulics; Instrumentation and Controls
  • Orlando, Florida, USA, May 11–15, 2008
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4816-7 | eISBN: 0-7918-3820-X
  • Copyright © 2008 by ASME


The digital safety Instrumentation and Control (I&C) system has been developed and approved in Japan. Our digital I&C system has been applied to many non-safety systems and approved for full I&C system including a safety system. The fully digitalized I&C system will soon be in operation in a newly constructed plant in Japan. Based on this proven technology, the digital I&C system will be applied to the I&C system in the US-APWR. This digital I&C system is slightly improved and modified to conform to the U.S. codes and standards. The I&C system of the US-APWR has some specific features. The system consisting of four systems capable of diverse echelons can ensure defense-in-depth and diversity which also achieves countermeasure against software common cause failures. In addition, the I&C system has a four-train configuration that applies to the safety human-system interface systems, safety protection system and safety plant component controls.

Copyright © 2008 by ASME



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