astronomical community has planned a drift-scan program covering the $57\%$ of the celestial sphere ($-14.3^\circ< \delta<+65.7^\circ$), called Commensal Radio Astronomy FAST Survey (CRAFTS)[@8331324]. CRAFTS plans to use more than 5,000 hours of telescope time. We plan to commensally analyze the sky survey data to find possible ETI candidate targets and to then do follow-up observations on these targets.

SERENDIP-data acquisition, reduction and analysis {#sec:3}
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The amount of raw data produced by these observations will be very large. Using the FAST 19 beam receiver and a sampling rate of 1 billion samples per second (Gsps), the data produced per second will be: $$1 {\rm\ Gsps}\times 1 {\rm\ Byte/sample} \times 2 {\rm\ pol} \times 19 {\rm\ beams}= 38 {\rm\ GB/s}.$$ Such a volume of data is too much for available storage systems. An automated pipeline for data reduction, RFI removal, and candidate selection is very important. We use SERENDIP VI [@7436240; @2000ASPC..213..485C], a real-time data processing system, and Nebula [@korpela19b], an off-line data analysis pipeline originally designed for use with SETI@home [@korpela19a] together with machine learning to reduce and analyze data. SERENDIP VI is described in this section. Figure \[fig:1\] shows the overall data processing framework.

The SERENDIP VI system is 