1. That explosion, in November, was caused by a defective valve on a storage tank, according to Pemex. 2. The sources said the last telemetry data received seemed to indicate a drop in helium pressure, perhaps due to a defective valve. 3. The defective valve was found when reactor operations were temporarily suspended in the course of a routine inspection, the officials said. 4. The last telemetry data received seemed to indicate a drop in helium pressure, perhaps due to a defective valve, he said. |
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