May-June 2019 NPJ

28 NuclearPlantJournal.com Nuclear Plant Journal, May-June 2019 I&C Commissioning... ( Continued from page 27) provide the response times of the RTDs; rather, they help determine if RTDs are properly installed in their thermowells. Any RTD that is found at cold shutdown to have installation or seating problems is removed from the thermowell and both the RTD and thermowell are cleaned and re-installed. The LCSR tests are then repeated to ensure that the problem is resolved. If the problem persists, then the RTD is replaced and this procedure is repeated until all RTDs are properly installed and seated in their thermowells. At the Sanmen and Haiyang plants, only a few RTDs had to be removed and reseated, or replaced, to yield optimum response times. The LCSR tests were later repeated at the hot standby conditions to measure the actual in-service response times of the RTDs. At the conclusion of these tests, all RTDs at Sanmen and Haiyang met their response time requirements. The LCSR tests are to be repeated once every Figure 3 Equipment set up for Response Time Testing of Tank Level Sensors in AP1000 Reactors. operating cycle during plant operation to verify that the RTDs are maintaining their satisfactory response time performance. AMS also performed ramp testing at the Sanmen and Haiyang plants to measure the response times of the safety-related pressure, level, and flow transmitters as installed in the normal configuration for service. These tests showed satisfactory response time results for all the transmitters tested. Also, the response times of safety-related tank level sensors were measured with satisfactory results. Further, the integrity of cables for all RTDs as well as pressure, level, and flow transmitters were verified during the commissioning tests of the AP1000 sensors performed by AMS in China. Going forward, AMS will work with Sanmen and Haiyang sites as well as other nuclear plant sites in China to provide testing services, equipment, and training as needed to enable the plants to meet their sensor response time requirements. Contact: H.M. Hashemian, Analysis and Measurement Services Corporation, 9119 Cross Park Drive Knoxville, TN 37923; email: hash@ams-corp.com. Figure 4 Representative TDR Trace for an AP1000 Cable Run and Photograph of the CHAR System. Annual Editorial Schedule Nuclear Plant Journal January-February Instrumentation & Control March-April Plant Maintenance & Advanced Reactors May-June New Plants & Outage Management July-August Vendor Advertorial & Instrumentation and Control September-October Plant Maintenance & Advanced Reactors November-December Annual Product & Service Directory 2020 Contact: Michelle Gaylord michelle@goinfo.com Telephone: (630) 364-4780 Fax: (630) 852-8787 3051 Oak Grove Road Suite 107 Downers Grove, IL 60515 USA