Advanced Test Reactor (ATR) Complex Warm Waste Pond Liner Replacement
LOCATION: Idaho National Laboratory, Idaho
TIMEFRAME: Phase One Summer 2016 with Phase Two in the Spring Of 2017
SCOPE OF WORK: Warm waste pond liner replacement. Construction of Sand Bag Berm, Double 45 Mil CSPE Liners, Nonwoven Geotextile & Geocomposite Layers Including Appurtenances, Radiation II Training
PROJECT PARTNERS: Owner: US Government – Battelle Energy Alliance, LCC (BEA) General Contractor: C&H Construction Company INC. Engineer: JUB & Walsh Installation and Materials Supplier: Layfield USA
Background Information and Challenge
Liner removal and typical anchor trench was not an option due to radioactive contamination within and around the perimeters of the two waste ponds. The engineered detail was to leave the existing double liner system in place and build an elevated berm on the existing ground elevation in order to not disturb the potential radioactive contamination under the ground surface. This made a difficult transition to avoid bridging between the existing slope elevation and the new sandbag berm.
During the construction process, it was determined that the east pond could be needed to store liquid coming from the reactor above the original design elevation and, therefore, the pond needed to be watertight between the existing berm and the new sandbag berm in a worst case scenario. It was also determined that Radiation II training was required for all personal inside the posted areas
Solution and Results
The sandbag berm was built to maintain the existing slope angle to minimize the possibility o f bridging. On Pond #2, a prefabricated skirt was seamed to the existing 20+ year old CSPE liner and extended up and over the sandbag berm.
A water tight barrier was formed between the existing top of berm and the top of the new sandbag berm. Allowing the water from Pond #1 to be pumped Into Pond #2 allowing the installation of the double-lined system