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| Verification for the representative sampling system of “Hualong I” NPP gaseous effluent: test and analysis |
| LI Hang1, LI Hang1, DING Shi-hai2, WANG Yong2, DU Wenxue2 |
1. China Institute of Atomic Energy(CIAE) P. O. Box 275-133, Beijing 102413 China;
2. China Nuclear Power Engineering Co. Ltd(CNPE |
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Abstract Objective Through experimental verification to ensure the sampling system (a single nozzle sampling head design) for the chimney gaseous effluent designed for the third-generation pressurized water reactor nuclear power plant "Hualong I" independently developed in China fully meets the sampling representative requirements.Methods Based on the requirements of American National Standard ANSI/HPS N13.1-1999, a 1:5 scale model of the "Hualong I" reactor stack was built to test the average cyclonic angle, gas flow velocity distribution, tracer gas distribution and tracer aerosol distribution in three different sampling cross sections. The verifications of the cyclonic angle, gas flow rate, and tracer gas concentration distribution were conducted in the Fuqing Nuclear Power Plant No. 1 and No. 2.Results In the central 2/3 area of the three pre-selected sampling sections (Q1, Q2, Q3) in the "Hualong I" proportional model stack and under two designed ventilation conditions, the coefficient of variations (COVs) of the gas flow velocity distributions were ≤ 1.1%, the maximum cyclone angle of all the measured point was 11.38°, the COVs of the tracer gas concentrations distribution were ≤ 4.4%, the COVs of the tracer aerosol concentrations distributions were ≤ 4.7%. As well as in the central 2/3 area of the real stack pre-selected sampling section, COVs of the gas flow velocity distributions were ≤ 8.4%, the mean absolute value of cyclone angles at all points was 11.3° (the maximum value was <20°). When the tracer gas injected from DVN iodine exhaust and the DVN normal exhaust, the distribution COVs of the tracer gas concentrations on the measured section were 2.2% and 1.3% respectively.Conclusion All test indicators of the "Hualong I" model stack and the real stack agree well with the requirements of ANSI/HPS N13.1-1999 standard for mixing uniformity of pollutants on the sampling section, the single point sampling method can be used to design the "Hualong I" stack gas flow sampling system.
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Received: 10 December 2017
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