Effective go/no go enrichment measurements

A simple plumbing bypass modification would eliminate excessive systematic error and improve precision for uranium hexafluoride gas enrichment measurements at centrifuge enrichment plants having small-diameter cascade pipes. Present gas enrichment measurements on typical small-diameter product pipes are indeterminate, because overwhelming systematic errors and large statistical errors result from the high deposit-to-gas ratios. The bypass would essentially eliminate the deposit from measurements. The intended purpose of go/no go measurements is to confirm that the enrichment of randomly selected product streams is ≤20%. The Hexapartite Safeguards Project participants agreed by consensus in 1983 on the importance of go/no go measurements