Fermi, 1. daily, control chart, +/- 3 sigma or +/- 3% tolerance limits are allowed, For our smear counters, we reference NUREG 1576, volume 3, 18.5.6.1 Gas Proportional Counting Systems, Table 18.5, "For all detector response checks, compare performance to control chart or tolerance limits: ±3σ or ±3%" There are other references in this chapter for gamma spec system QC that are similar
2. No Benjy Bertossi Fermi2 - RP Supervisor 734-586-4935 [email protected] From: "Byrum, William F" <[email protected]> To: "[email protected]" <[email protected]> Date: 08/13/2014 02:04 PM Subject: Powernet: Smear counter quality control checks Sent by: [email protected] Duke Energy request the following information: 1. For alpha / beta counters used to count smears for contamination determination, what daily (or other frequency) quality control checks are used? ( i.e. Control chart with a 3 sigma limit or a single count with a + 20% limit, etc.) 2. Do you employee different methods for counters used to analyze effluents or other samples not related to smear counting for contamination control. Bill Byrum, CHP,RSO EnRad Laboratories Duke Energy [email protected] Phone: 980.875.5811 Cell Ph.: 704.996.6906
