| 摘要 |
PURPOSE:To enable the extracting of trap of several kinds of impurities properly, by specifying extraction pipings for impurities individually to run the impurities at a flow rate inversely proportional to the density thereof. CONSTITUTION:A plurality of branches 2a-2e are provided on a sampling pipe 2 of a mother pipe 1 for supply of primary cooling water at a nuclear reactor and equipped with flow control valves 5a-5e, filters 6a-6e and integrating flowmeters 7a-7e. For example, when the flow rate is 100cc per min and daily amount of extraction is 70mug for Fe, 9mug for Cu, 240mug for Ni, 7mug for Cr and 4mug for Co, the pipings 2a-2e are set to correspond to Fe, Cu, Ni, Cr and Co sequentially and the flow rate inversely proportional to the density as mentioned above is adjusted with adjusting valves 5a-5e. This enables the maintaining of traps of impurities moderate, neither too much nor too little thereby accomplishing a sampling to satisfy a measuring accuracy.
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