4cefed wrote:nubnuts...
Can you tell me what tank this is? I've never worked at Millstone (it is Millstone right?) but PWRs are all very similar. I'm trying to figure out what system you would have a borated water tank reading 9R/hr. Is it an equipment drain tank or some kind of sump? Something in radwaste?
millstone is correct. it was the volume control tank.
4cefed wrote:Did you and your crew understand the pre-job briefing correctly? was the GENERAL AREA 9R/hr or was it just one or two spots? What was the contamination level? High enough to justify respirators I guess...
the mop heads that they were using to clean the inside were reading 8R/hour. when hp stuck their survey probe thing in the manyway right after they opened up the hatch it was reading 9R/hour.
4cefed wrote:Did you get fit tested for an actual negative pressure respirator or some kind of PAPR? (The tyvek hood blower thing.)
a group of us were administered the physical and fitted for full-face respirators. now i gots me a nifty sticker on the back of my id badge. i felt special.
4cefed wrote:There has to be a way to reduce the dose rates in the tank first. Installing shielding would be great, unfortunately they would likely ask you guys to erect scaffolding to hand shielding from. (Sucks being a carpenter) Clean out the damn tank. They can get someone to hydrolaze that thing and knock down the dose rates.
for what they needed to do, setting up shielding would have taken more time than their initial goal, while having more guys getting dosed up. like i said, o.d. is roughly 10' and about 10' tall. shielding would have just made the inside that much more cramped.
4cefed wrote:Sounds to me like this is a permit required confined space. You can hammer them on those requirements like having a qualified rescue plan with rescue-trained personnel. Did they sniff the air this shift? This will also be a Locked High Rad Area that requires continuous RP coverage so you will have to have some kind of audible contact with the RPs and I hope some kind of remote monitoring of your dose. That's a lot of paperwork there.
definitely would have been a permit required confined space with hp personnel at the tank at all times. the rescue plan was in the works, but they came to a halt when the smallest hp tried to enter the tank and got hung up on his respirator. even if he did manage to get in, they still weren't sure how they would get him out in an emergency scenario.
4cefed wrote:Still, even soaking up 1.5 REM is nothing to lose sleep over.It should be avoided if possible, but you will not endure any health effects.
i didn't get my alara hat for soaking up dose, lol. we did a tear down the other night and i asked hp to survey the area since there was a sign posted on a nearby pipe claiming 30-90mR in the general area. my foreman made some snide comments about holding the job up blah, blah, blah. but of course he would be the one standing by the green sign watching us work alongside the hot pipe. he's a d!ck.
4cefed wrote:Your post is two days old so I'm assuming this job is over and done with. If you have any questions please let me know if I can help.
job was completed, but no one went in. we went to the big meeting with all the big cheeses and the various trades involved. nobody was all that keen on entering that tank and they decided to just purge the entire thing for the welding that needed to be done. just like we suggested from the beginning. but what do we know?