51315-6198-241-AY-102 Leak Detection Pit Drain Line Inspection Report

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Product Number: 51315-6198-SG

ISBN: 6198 2015 CP

Author: Brandon Vazquez

Publication Date: 2015

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In October 2012 Washington River Protection Solutions LLC (WRPS) determined that waste had leaked into the annulus of Tank241?AY?102. WRPS conducted an extensive review of TankAY?102 and increased both inspection and monitoring of the tank; however the precise cause and location of the leak could not be determined. In parallel with the leak in the primary tank the TankAY?102 leak detection pit (LDP) was accumulating water through the drain system external to the secondary tank liner. Liquid collecting in the LDP is suspected to be from water intrusion and collects at a rate such that the LDP must be pumped routinely. Following a routine pumping event on June 20 2013 elevated radiation dose rates were noted on the transfer hose and surface contamination readings were found on the transfer pump when it was removed from the Tank AY-102 LDP. These two field readings suggested that tank waste from a secondary liner breach could be leaking into the LDP. As a result WRPS initiated a plan to ascertain the integrity of the secondary tank liner including a robotic inspection of the LDP. This paper provides a description of the design components operational approach and those results gained from the Tank AY-102 LDP drain piping visual inspection. To perform this inspection a custom robotic crawler with a deployment device was designed built and operated by IHI Southwest for WRPS to inspect the 6 in. leak detection pit drain line. These tasks were accomplished from initial award of the contract to completion of the inspection in about two months.