While admitting that the suppression pool at the bottom of the containment vessel had been damaged in the explosion, causing a drop of pressure there, Japanese nuclear authorities emphasized that the containment had not been breached as a result of the explosion and contained no obvious holes.
12.
About 10 minutes after the earthquake, TEPCO operators removed both of Unit 1's isolation condensers from service, and instead chose to activate the HPCI ( High Pressure Coolant Injection ) systems to cool the reactor and the core spray system was activated at 15 : 07 to cool the suppression pool.
13.
The ultimate heat sink was restored when the service seawater system pumps in the pump room were repaired in units 1, 2 and 4 starting March 13 restoring the normal ECCS and heat removal systems to operable status and cooling was switched to the Residual Heat Removal System ( RHR ) portion of the ECCS . The RHR systems were first activated to cool down the suppression pools ( torus ) and drywells to operable status, and water injections were made to the reactors using the Low Pressure Coolant Injection ( LPCI ) mode as needed.
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