Michelle, You should verify you stayed within the ODCM instantaneous NG dose rate limits. Remember the standard NG monitor setpoint methodology is based on the historical average X/Q and the actual source term (some sites use an assumed source term). Given that the met conditions were unusual, one could not claim the annual average X/Q value would be representative of the meteorology and therefore you could not rely on the rad monitor alone to guarantee compliance.
The dose rate during the inversion should be calculated using the actual source term and either a “short term” x/q (which can be generated by XOQDOQ) or calculate the X/Q value using the actual meteorology during the inversion. Short term X/Q values can be 1 or 2 orders of magnitude higher than the annual average X/Q. It should be noted that in the past the NRC has asked licensees to re-evaluate releases using the met data during the time of the release for discharges of specific concern. Have a great day, Jim Jim Key Key Solutions, Inc. 4350 Big Springs Road, Lebanon, TN 37090 615-453-3712 (Office) <mailto:[email protected]> [email protected] 413-403-9805 (e-Fax) From: Powernet <[email protected]> On Behalf Of Paul M Bradley via Powernet Sent: Monday, January 7, 2019 11:39 AM To: [email protected] Cc: Paul M Bradley <[email protected]> Subject: Re: [Powernet] Fuel leak Lessons learned request Just remember everyone…this is NOT a closed group and can be viewed by outside regulatory agencies…. From: Powernet [mailto:[email protected]] On Behalf Of Williams, Michelle Lewis via Powernet Sent: Monday, January 07, 2019 11:50 AM To: [email protected] <mailto:[email protected]> Cc: Williams, Michelle Lewis Subject: [External] [Powernet] Fuel leak Lessons learned request All, As a result of our fuel leak, Vogtle has experienced some recent and unique challenges. Recognizing that there are other issues we haven’t thought of, we were hoping to gain some insights based on experiences you have had recently. To provide an example of what we are asking about, here is an example of a recent issue experienced at Vogtle: Vogtle has to vent containment 2-3 times per week due to slow pressure increases (this is typical for us and not related to the fuel leak). Since our fuel leak was identified last October, we have continued to vent containment due to containment pressure. Two weeks ago, multiple individuals from a particular building (not in the Radiation Controlled Area) were setting off exit monitors while attempting to exit the plant. Upon further investigation, it was determined that the containment venting performed that day had been done while the atmosphere was experiencing a temperature inversion. This lead to noble gases staying very low to the ground and “gassing up” individuals in a particular building (due to wind direction). RP was dispatched and there was no contamination present, it was simply short lived noble gases getting into people’s clothing, similar to what commonly happens in a Radiation Controlled Area. Based on the example provided above, are there any unique issues or key learnings that you had from your most recent fuel leakers? Especially anything that didn’t meet the reporting thresholds for ICES, etc. but still provided valuable learnings. Any experiences would be greatly appreciated. Regards, Michelle Williams RP Superintendent Support Services Plant Vogtle Units 1&2 706.848.4236 tel 919.770.7138 cell _____ CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
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