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264 gal/hr*hr/60min = something alittle over 4 gallons per min.. not much

@dean I thought there were 3? A spray that is up rather high in the well, then the 2 in the illustration?

perhaps looking at it wrong.. hmmmm

I think this is the spray line we've seen spraying on the videos

Low-pressure coolant injection system (LPCI)

The low-pressure coolant injection system, the "heavy artillery" in the ECCS, can be operated at reactor vessel pressures below 465 psi. The LPCI consists of 4 pumps driven by diesel engines, and is capable of injecting a mammoth 150,000 L/min (40,000 US gal/min) of water into the core . Combined with the CS to keep steam pressure low, the LPCI is designed to suppress contingencies by rapidly and completely flooding the core with coolant.

High-pressure coolant injection system (HPCI)

The high-pressure coolant injection system is the first line of defense in the emergency core cooling system. HPCI is designed to inject substantial quantities of water into the reactor while it is at high pressure so as to prevent the activation of the automatic depressurization, core spray, and low pressure coolant injection systems. HPCI is powered by steam from the reactor, and takes approximately 10 seconds to spin up from an initiating signal, and can deliver approximately 19,000 L/min (5,000 US gal/min) to the core at any core pressure above 6.8 atm (690 kPa, 100 psi). This is usually enough to keep water levels sufficient to avoid automatic depressurization except in a major contingency, such as a large break in the makeup water line.

ty elaine

@elaine.. that helps.. on the last page the operative paragraph beginning with From Feb 2 ......... when the temp rises they assume "oh my criticality" so they pump more boric acid in with hopes of stopping it and then sample to see if they have Xe135 levels which are greater than 1 Bq/cm3 - which is their self defined criticality point

Inside of a BWR reactor pressure vessel (RPV), feedwater enters through nozzles high on the
vessel, well above the top of the nuclear fuel assemblies (these nuclear fuel assemblies
constitute the "core") but below the water level. The feedwater is pumped into the RPV from
the condensers located underneath the low pressure turbines and after going through
feedwater heaters that raise its temperature using extraction steam from various turbine stages.
The feedwater enters into the downcomer region and combines with water exiting the water
separators. The feedwater subcools the saturated water from the steam separators. This water
now flows down the downcomer region, which is separated from the core by a tall shroud.
The water then goes through either jet pumps or reactor internal pumps that provide additional
pumping power (hydraulic head). The water now makes a 180 degree turn and moves up
through the lower core plate into the nuclear core where the fuel elements heat the water.
When the flow moves out of the core through the upper core plate, about 12–15% of the
volume of the flow is saturated steam.

www.ansn-jp.org good document.. @elaine or lilly can you copy figure 3 and post in here.. it helps to explain things

they do have a feedwater sparger and a low pressure core spray sparger a high pressure sparger .. all of which would be a good path to get some spray flow in