Water was drained from the T1 and T2 cooling packages, samples taken, and delivered to RPG.
All filters on the T1 and T2 cooling packages were changed except for the T1 demin. line filter which is hard to access and could not be properly drained. This filter will be changed next shutdown when the area is more accessible while the resin cans are being changed.
The field from each filter was measured after removal:
T1 Target Water Filter: 180μSv/hr @ 0.5m, 8.26mSv/hr on contact
T1 Collimator A Filter: 0.86μSv/hr @ 0.5m, 0.61μSv/hr on contact (same as background)
T2 Target Water Filter: 185μSv/hr @ 0.5m, 10.5mSv/hr on contact
T2 Demineralizer Water Filter: 2.10μSv/hr @ 0.5m, 30.0μSv/hr on contact
9000cpm were measured on Isaac's coveralls after completing this work, most likely from laying on the concrete blocks next to the cooling packages to access the filters. Keith's coveralls had 300cpm. Both pairs were bagged and taken to active laundry. The filter cartridges on Isaac's respirator had 700cpm. RPG was notified and Danka will do a gamma spec on the respirator filters.
The T1 and T2 cooling package water will be released after approval from RPG. |