Both fire pumps running with no fire actuations and header pressure stable at 135 psig: cause is loss of normal AC power to BOTH fire pump battery chargers. The diesel-driven fire pumps normally start on low header pressure (<85 psig and time-delayed <75 psig), but also include an independent battery that auto-starts both fire pumps on loss of normal AC power.

If both Salem fire pumps are inoperable (at least one fire pump and one fire pump water supply NOT available), per S2.OP-AB.FIRE-0002 step 3.5: open the backup fire suppression water supply cross-tie valves from Hope Creek. If the Hope Creek cross-tie cannot be established within 24 hours, then the unit must be in Hot Standby within 6 hours, Hot Shutdown within the following 6 hours, and Cold Shutdown within the subsequent 24 hours. Hot Standby (not Hot Shutdown) is the first required mode within 6 hours of the 24-hour action time expiring.