> Subject: Re: Powernet: RE: Process to reduce PCE's >
> As Jerry Barber points out, I've done a ton of research to reduce PCEs and > also analyze the associated garment monitoring efforts. If you use laundered > cloth PCs, then they end up being monitored after a wash. If the monitoring > limit is 50K, and you only utilize the standard BETA monitoring and setpoint, > then particles as large as 500K to 1,000,000 dpm can get through ........ > especially on the inside of the garment. If you use a 20 or 50K setpoint > with GAMMA monitoring, what you want will be what you get. > > When I was at Palo Verde, we switched to disposable PC's and it was without a > doubt the radiologically appropriate thing to do; i.e., workers in clean > garments to minimize PCEs. > > Michael Lantz, CHP > Manager, Technical Services > Global Dosimetry Services > 602 677 3020 > > Sent from my iPad > > On Dec 8, 2010, at 5:33 PM, "Barber, Jerry" <[email protected]> wrote: > >> We have also gone to disposable PCs. That definitely helped us. The last >> year we used launderable PCs we could show we had numerous PCEs due to them. >> If you don't switch to disposable make absolutely sure you are using very >> conservative limits for the laundry monitor setpoints your vendor uses (we >> thought we were using 20K but they had snuck in 50K without anyone on site >> remembering authorizing it). I would recommend rejecting at some value < >> 20K (10K or even 5K - Mike Lanz has good info on the actual sensitivity you >> are likely getting with real contamination ???) >> >> We also have been much more aggressive with decon and have added additional >> double SOPs (for S/Gs, Coming out of Cavity, areas around our cavity drain >> valve which has unfortunately allowed overflows onto the floor in the past). >> We have aggressive shiftly mopping and vaccuming routines in high traffic >> areas and are quick to do additional decon when shiftly routines show a >> noticeable increase in contamination levels. >> >> We are using a lot more "raywall" around high contamination areas and oil >> cloth which really seems to help with our nuisance particle contamination. >> >> We also require hoods for almost all entries, with very few exceptions. >> >> Probably the biggest thing we have done is to be aggressive in coding our >> PCEs. Unless it is likely that RP dropped the ball by not properly >> surveying an area and/or specifying appropriate contamination dress or >> inadequate job coverage for certain higher risk activities, etc., the PCE >> gets coded to the Radiation Worker. These individuals have much more to do >> with whether they get contaminated or not than RP. A Nuclear Condition >> Report is generated for each PCE and the individual's organization gets it >> if it is coded radworker practices. In addition, all workers are restricted >> from the RCA if the PCE is attributed to poor radiation worker practices and >> they and their supervision get to talk to the Shift Outage Manager before >> this is lifted. Coupled with a very challenging PCE goal that is before >> site management every shift, these changes have helped to significantly >> reduce PCEs at Robinson. >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On Behalf Of >> ALBISHARAT Sasha(A) - BRUCE POWER >> Sent: Wednesday, December 08, 2010 11:28 AM >> To: [email protected] >> Subject: Powernet: Process to reduce PCE's >> >> Good day, >> >> We are having a challenging time in trying to reduce the number of PCEs >> we get. I would like to know if any of the plants have had similar >> problems in the past and what they have done to reduce this number? >> Also, for plants that perform well in this area what do you do to keep >> this number low? >> >> As a note - we function in a self-protection model.. RP oversight of all >> rad work is not currently possible for us. >> >> Thank you >> >> Sasha Albisharat >> Bruce A Health Physicist >> Ph: 519-361-2673 ext. 13959 >> pager: 519-370-3194 >> >> ----------------------------------- >> Powernet - a service of the Health Physics Society Power Reactor Section >> >> Powernet archives at http://www.mail-archive.com/[email protected]/ >> >> Reply to: [email protected] >> If Questions, contact Mike Russell, CHP at [email protected] >> ----------------------------------- >> Powernet - a service of the Health Physics Society Power Reactor Section >> >> Powernet archives at http://www.mail-archive.com/[email protected]/ >> >> Reply to: [email protected] >> If Questions, contact Mike Russell, CHP at [email protected]
