ML100840084

University of Irvine License Renewal E-mail from George Miller Regarding Revised Maximum Dose from a Mha

ML100840084
Person / Time
Site:	University of California - Irvine
Issue date:	03/23/2010
From:	Geoffrey Miller University of California - Irvine
To:	Geoffrey Miller, Cindy Montgomery Research and Test Reactors Licensing Branch, University of California - Irvine
MONTGOMERY C, NRR/DPR/PRLB 415-3398
References
Download: ML100840084 (2)

Text

From:George Miller [gemiller@uci.edu]Sent:Tuesday, March 23, 2010 3:06 PM To:Montgomery, Cindy; George Miller (gemiller@uci.edu)

Subject:

Correction to FAQ response submitted- Appendix F.

Ms Montgomery:

In UCI's recent submission to your RAI, I have reviewed the response, and realized that the

thyroid exposure predicted for our MHA was over estimated in several

ways.

In addition to not adjusting for a realistic operating schedule instead

of "infinite operation at full

power", we did not allow for any plating of iodine isotopes on surfaces

that would significantly

reduce the airborne concentration, and hence significantly reduce the

anticipated thyroid

exposure rate and hence the total calculated exposure.

In Oregon State University's SAR, they adopted a method which suggests

halogen release

plates out to reduce the airborne concentrations to less than 25% of the

initial release.

Thus I wish to revise my dose rate expected to the thyroid in the

unlikely event of a water "free" fuel element cladding rupture, to 0.25 x 0.45 rads/second = 0.11

rads/second .

Given this rate and the 2 minute evacuation time for personnel from the

facility, the revised

maximum dose would be 13.2 Rads to the thyroid.

I hope you can accept this late revision to provide a more realistic, but still very conservative

estimate of potential exposure.

Thank you.

Regards.E-mail Properties Mail Envelope Properties (4BA910FA.9090906)

Subject:

Correction to FAQ response submitted- Appendix F.Sent Date:3/23/2010 3:05:44 PM Received Date:3/23/2010 3:05:44 PM From:George MillerCreated By: gemiller@uci.edu

Recipients:

Cindy.Montgomery@nrc.gov (Montgomery, Cindy)

Tracking Status: None gemiller@uci.edu (George Miller (gemiller@uci.edu))

Tracking Status: None Post Office:

uci.eduFilesSizeDate & TimeMESSAGE36253/23/2010 Options Expiration Date:

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