The wireless diagnostic system for motor operated valves

ITO Haruo¹, AKIYAMA Michiaki², and SUZUKI Syunichi³

1. Safety Issue Management Group, Japan Nuclear Technology Institute, Tokyo, Japan (ito.haruo@gengikyo.jp)
2. Codes and Standards Division, Japan Nuclear Technology Institute, Tokyo, Japan (michiaki.akiyama@gengikyo.jp)
3. Plant Management Department, Japan Atomic Power Company, Tokyo, Japan (syunichi-suzuki@japc.co.jp)

Abstract: To aim at maintenance optimization, a motor operated valve (MOV) diagnostic system called “MOVDAS” has been developed by using new sensor technologies incorporating torque sensor into the MOV. It has been introduced into nuclear power plants operated by Japan Atomic Power Company (JAPC) for the support of Condition Based Maintenance (CBM). This system, directly checking the torque behavior of the MOV, accurately diagnoses the condition of the MOV during plant operation. Further for the ease of data collection and manpower saving, the wireless diagnostic system based on MOVDAS utilizing Personal Handyphone System (PHS) has been recently introduced into nuclear power plants in JAPC.

Keyword: Condition-Based Maintenance, MOVDAS, build-in torque sensor, wireless diagnostic system