J. of the Korean Radioactive Waste Society Vol.8(4), P. 319-327, Dec. 2010. A Study on Construction and Application of Nuclear Grade ESF ACS Simulator Sook-Kyung Lee 1), Kwangsin Kim, Soon Hwan Sohn, Kyu-Min Song, Kei-Woo Lee, Jeong-Seo Park*, Soon Joon Hong** and Sun Haeng Kang*** KEPCO Research Institute, 65 Munji-Ro, Yuseong-Gu, Daejeon * KHNP, 514 Kyema-Ri, Hongnong-Eup, Yonggwang-Gun, Jeonnam ** FNC Tech. Co. Ltd. San 56-1, Shinrim 9-Dong, Kwanak-Gu, Seoul *** KFTL, 1110-23 Oryong-Dong, Buk-Gu, Gwangju, (Received September 24, 2010 / Revised November 12, 2010 / Approved November 17, 2010) Abstract A nuclear plant ESF ACS simulator was designed, built, and verified to perform experiment related to ESF ACS of nuclear power plants. The dimension of 3D CAD model was based on drawings of the main control room(mcr) of Yonggwang units 5 and 6. The CFD analysis was performed based on the measurement of the actual flow rate of ESF ACS. The air flowing in ACS was assumed to have 30 and uniform flow. The flow rate across the HEPA filter was estimated to be 1.83 m/s based on the MCR ACS flow rate of 12,986 CFM and HEPA filter area of 9 filters having effective area of 610 610 mm 2 each. When MCR ACS was modeled, air flow blocking filter frames were considered for better simulation of the real ACS. In CFD analysis, the air flow rate in the lower part of the active carbon adsorber was simulated separately at higher than 7 m/s to reflect the measured value of 8 m/s. Through the CFD analyses of the ACSes of fuel building emergency ventilation system, emergency core cooling system equipment room ventilation cleanup system, it was confirmed that all three EFS ACSes can be simulated by controlling the flow rate of the simulator. After the CFD analysis, the simulator was built in nuclear grade and its reliability was verified through air flow distribution tests before it was used in main tests. The verification result showed that distribution of the internal flow was uniform except near the filter frames when medium filter was installed. The simulator was used in the tests to confirm the revised contents in Reg. Guide 1.52 (Rev. 3). Key words : Engineered Safety Feature, Atmosphere Cleanup System, Simulator, Reg. Guide 1.52 1) Corresponding Author. E-mail : sklee@kepco.co.kr
J. Kor. Rad. Waste Soc. Vol. 8(4), p.319-327 Dec. 2010. :
A Study on Construction and Application of Pe C c D f D BM D p Ku k b D Pe f U 0 R D p D f D BM T U 0 P p Table 1. Pressure difference in MCR ACS(Filter frames considered)
J. Kor. Rad. Waste Soc. Vol. 8(4), p.319-327 Dec. 2010. Table 2. Flow speed at various points in MCR ACS(Filter frames considered) Table 3. Scale down ratio of simulator of ESF ACS of Yonggwang #5,6 control room Fig. 1. Flow velocity and flow lines in activated carbon adsorber bank in MCR ACS Fig. 2. Flow lines and velocity vectors in actual system and simulator
A Study on Construction and Application of Table 4. Comparison of filtration efficiency (Filter frames considered) Table 5. Detail specification of simulator
J. Kor. Rad. Waste Soc. Vol. 8(4), p.319-327 Dec. 2010. Fig. 3. Drawing of Nuclear power plant ESF ACS simulator Fig. 4. Nuclear power plant ESF ACS simulator[10,14]
A Study on Construction and Application of Fig. 5. Flow measuring points at pre-hepa and post-hepa filter in simulator Fig. 6. Air flow velocity distribution without MOD filter (pre- HEPA)
J. Kor. Rad. Waste Soc. Vol. 8(4), p.319-327 Dec. 2010. Fig. 7. Air flow velocity distribution with MOD filter (pre- HEPA) Fig. 8. Air flow velocity distribution with MOD filter (post- HEPA)
A Study on Construction and Application of