Double Sampling in MARSSIM

["Abelquist, Eric" <AbelquiE@ORAU.GOV>]

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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