This is very helpful Tom. Thanks for your excellent detail memory! So it sounds like the issue you're recalling may exist for various PWR plant designs. In situations where fuel failure has been relatively high, you can see dose rates on those in-yard tanks going above 2.5 mrem/hr. The RWST and the SIRW are analogous tanks holding large quantities of refueling water.
The specific tanks I was wondering about, though, are the holdup tanks used to store what is left after being processed through the plant's cleanup systems, especially demineralizers and filters. In Combustion plants, these are referred to simply as the Holdup Tanks. Together with the Reactor Makeup Water Tanks, they represent the main stored activity outside of the plant buildings. So the Holdup Tanks would have less radioactivity than any of the reactor water storage tanks. Does anyone have experience of elevated doses for these Holdup Tanks? Tim > I donât know if you are interested in Westinghouse plants but I was the > RPM at Trojan for 25 years including the years with significant failed > fuel. Our Refueling Water Storage tank which held reactor and refueling > canal water was located outside adjacent to the spent fuel and containment > buildings. We had hot spots on contact with the bottom flange of the tank > of over 100 mr/hr and general areas (@30 cm) of 30 mr/hr. We had to build > a structure around the base of the tank for security purposes and we had > the structure sized to keep the dose rates outside the structure below 5 > mr/hr. Later we had to use rope barriers to demarcate the 2 mr/hr area. > > I worked at Palisades way back in the 70âs and seem to remember similar > results for the SIRW tank (that is a long time ago to try to recall) > > Regards > > Tom Meek, CHP (semiretired) > > > > From: Tim Lloyd [mailto:[email protected]] > Sent: Thursday, June 2, 2016 8:33 AM > To: [email protected] > Subject: [powernet] Dose Rates on In-Yard Holdup Tanks > > > > > I have a question for operators of CE plants. > > Does anyone have experience of high dose rates on holdup tanks located in > the yard outside the plant building? If not, do you have a feel for the > types of dose rates that are typical on these storage tanks? > > Best regards, > > > Tim Lloyd > > Timothy M. Lloyd, P.E. > Principal Engineer, Nuclear Operations and Radiation Analysis > Westinghouse Electric Company > Products: Spent Fuel Radiation Analysis ; Radiation Engineering & Analysis > 236 Glenwood Avenue > Santa Cruz, CA 95060 > +1 831 227-8453 (office/mobile) > [email protected] <mailto:[email protected]> > > > > Powernet - a service of the Health Physics Society Power Reactor Section To post message: Send or Reply to: [email protected] To unsubscribe: send message to [email protected] archive(Nov2015->): http://www.mail-archive.com/[email protected]/ archive(<Oct2015): http://www.mail-archive.com/[email protected]/ If questions, contact E. Scott Medling, CHP at [email protected]
