This is the seventh quarterly report on the progress of activities addressing safety issues •associated with-Hanford Site high-level radioactive waste tanks that contain ferrocyanide compounds. In the presence of oxidizing materials, such as nitrates or nitrites, ferrocyanide can be made to explode in the laboratory by heating it to high temperatures [above 285 *C (545°F)]. In the mid 1950s approximately 140 metric tons of ferrocyanide were added to 24 undergroundhigh-level radioactive waste tanks. An implementation plan (Cash 1991)* responding to the Defense Nuclear Facilities Safety Board Recommendation 90-7 (FR 1990

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