RICHLAND, Wash. – EM Office of River Protection (ORP) contractor Bechtel National, Inc. continues to make progress on testing secondary safety systems installed to prevent situations that could potentially harm the Hanford Site Waste Treatment and Immobilization Plant (WTP), workers, or the environment. The WTP team has completed testing on six of the 37 systems, called safety instrumented functions (SIFs), in the plant’s Low-Activity Waste (LAW) Facility. The testing demonstrates that hardware and software in these systems work together and function correctly — an important step before handing over safety systems to plant management for commissioning. Included in the testing was a system that detects a potential large leak of steam and isolates the steam inside the LAW Facility to protect safety equipment. The WTP team expects to complete tests on all 37 SIFs and turn over the systems to support commissioning by the end of this fiscal year.