Re: Double Sampling in MARSSIM

[willim01@mskcc.org]

     Sorry for being so cynical, BUT which NRC is this; decommissioning 

     NRC, NMSS NRC, power Rx NRC, or Medical NRC?  They are all very VERY 

     different groups.  Could it be the NRC that is promoting peer reviewed 

     std such as ANSI in lieu of NUREGs?

     

     Matt Williamson

     willim01@mskcc.org

     

     Obviously my take on the situation ONLY; not my employer or 

     employees...Tx







______________________________ Reply Separator 

_________________________________

Subject: Double Sampling in MARSSIM

Author:  AbelquiE (AbelquiE@ORAU.GOV) at Internet

Date:    10/15/02 4:35 PM





It appears that the NRC has addressed the long-standing issue of "Is it ok 

to collect more samples if my survey unit fails the statistical test, but 

the mean is less than the DCGL?"  The simple answer is 'yes', if it was 

agreed upon with the NRC staff as part of the DQO process.  Appendix C in 

draft NUREG-1757 (http://www.orau.gov/ddsc/Resources/guidance/NRC.htm) 

provides the details.  The NRC cautions that double sampling should not be 

used as a substitute for adequate planning.  

     

This is good news for MARSSIM users who struggle with this issue.  For 

MARSSIM Techies, the downside of collecting more samples in a failed survey 

unit is that the regulator's Type I error increases (risk of passing a 

survey unit that should fail).  Anyway, I'm pleased to see guidance that 

supplements the MARSSIM on this real FSS issue.

     

Regards

Eric

     

Eric W. Abelquist

ORISE

P.O. Box 117

Oak Ridge, TN 37831

Tel (865) 576-3740

Fax (865) 241-3497

abelquie@orau.gov

     

One stop shop for your D&D needs..the DDSC! 

www.orau.gov/DDSC

     

     

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