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SFR Component Design and Balance of Plant additional and new complementary shutdown system rod to assure reactor shutdown. The in- depth renovation of PHÉNIX demonstrated that the major technical operations were industrially feasible such as the ability to clean steam generators and reuse them afterwards and the ability to carry out ultrasonic investigations of the reactor vessel. Due to the success of the various operations, the operational life of PHÉNIX which commenced in 1974 was extended by ten years until March 2009 To increase the JOYO power level from 100 to 140 MWt, the intermediate heat exchangers, dump (sodium-to-air) heat exchangers, connecting sodium piping, and electric motors of the primary and secondary sodium pumps were replaced while maintaining a sodium level and fuel assemblies inside of the reactor vessel. In the particular instance of replacing the original sodium piping with new piping, work planning with the benefit of tests using full-size mockups, reduction of worker exposure time through training, installation of temporary shielding, and transparent seal bags were effective in reducing worker exposure and preventing the spread of contamination. Pipes were cut using a combination of initial bite cutting in an air atmosphere followed by roller press down cutting inside of a seal bag with measures to prevent foreign material (i.e., small cut pieces or worker tools) from entering piping. Residual sodium was removed using cloths wetted with alcohol and water. Figure 1: Seal Bag for Prevention of Oxygen Ingression at JOYO. Experience and lessons learned from the PHÉNIX work were reported in a summary report containing an in-depth bibliography of reports by the participating organizations. The JOYO upgrading experience and lessons learned were reported in a summary report and two detailed JAEA reports in Japanese. III. IN-SERVICE INSPECTION CEA, JAEA, and KAERI have contributed information on the ongoing development of new and complementary in-service inspection tech- nologies for in-vessel sodium components. JAEA is developing two ultrasonic sensors for under- sodium viewing. The first sensor is for real-time imaging to inspect for dislocations or deformations of structures. It is a piezoelectric element sensor that has a resolution of approximately 2 mm and supports an image processing time of approximately 0.5 second per image. The second sensor is for inspection to detect fatigue cracks. It is an optical diaphragm- type sensor and has a high resolution of approximately 0.3 mm. The sensors would be mounted on an under-sodium vehicle which would be driven or held on station in the sodium inside of a reactor vessel using six small magneto–hydrodynamic sodium pumps. KAERI is developing a waveguide sensor approach enabling the ultrasonic transducer to be supported outside of the sodium pool and at a lower temperature at the reactor vessel upper head thereby minimizing the challenges to transducer performance and survival due to high sodium temperature, sodium chemical activity, and radiation from the nuclear core. The waveguide sensor is based upon the generation and transmission of Lamb waves (i.e., surface waves propagating in an elastic solid) along a metallic strip waveguide. As shown in Figure 2, a 10 m long waveguide sensor module was fabricated incorporating from top to bottom a piezoelectric element ultrasonic transducer, a liquid wedge producing an A0 mode Lamb wave having a low frequency range below 2 MHz (Such zero-order Lamb wave modes exist over a range of frequencies and can transmit a significant amount of energy with low attenuation.), a waveguide strip plate surrounded 248 GIF Symposium – Paris (France) – 9-10 September, 2009PDF Image | SFR COMPONENT DESIGN AND BALANCE OF PLANT PROJECT
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