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					Water injection volume (averaged discharge flow rate) by Fire Engines (1) Fukushima Daiichi Unit-1 <Estimation>
                Data Base for Unit-1
         date         Estimated flow Estimated flow
                        rate (m3/h)    rate (m3/h)                      Actions                                              Remarks
                       (Fresh water)    (Seawater)
 2011/03/11 12:00             0              0
  2011/03/12 4:00             0              0

                                                     ・Mar 12th about 4:00                        Alternative water injection line established at 20:50 on Mar 11th
  2011/03/12 4:00          7.8              0        1300L of freshwater, carried by fire        using diesel-driven fire pumps (DDFP). Pumps started up, ready
                                                     engines, injected into reactor via fire     for water injection upon reactor depressurization. But DDFP
                                                     protection system lines                     shutdown confirmed at 01:25 on Mar 12th.
                                                                                                 Freshwater injection at about 04:00 on March 12th was
  2011/03/12 4:10          7.8              0        ・04:00 to 05:46                             assumed to have been at a constant flow rate. Its time duration
                                                     Water injection by fire engines interrupted is unknown but assumed to be 10minutes here for making graph.

  2011/03/12 4:10           0               0
  2011/03/12 5:46           0               0

                                                                                                 In the early stage, water was pumped up from the fire
                                                                                                 prevention water tank and fire engines were moved to the
                                                     ・5:46                                       turbine building side for water injection. Later, water was
                                                     Freshwater injection started into reactor   injected via the continuous injection line connecting the fire
  2011/03/12 5:46          8.8              0        via fire protection system lines by fire    prevention water tank and fire protection system line water
                                                     engines                                     supply port.
                                                                                                 The freshwater injection from 05:46 was intermittent at the
                                                                                                 beginning. It is shown in the chart, assuming a continuous flow,
                                                                                                 since it is unknown when the continuous injection started.

                                                     ・14:53
 2011/03/12 14:53          8.8              0        Freshwater injection to reactor by fire
                                                     engines. About 80,000L in total
                                                     completed.
                                                     ・14:53 to 19:04
                                                     Water injection line being configured with Unit-1 R/B exploded at 15:36, damaging the hoses for seawater
 2011/03/12 14:53           0               0        the Unit-3 water pit that contained        injection being prepared in parallel with freshwater injection
                                                     seawater due to tsunami, as the water
                                                     source
 2011/03/12 19:04           0               0
                                                     ・19:04
 2011/03/12 19:04           0              10.8                                                            is         estimated using
                                                     Seawater injection started by fire engines Flow ratefire roughly and its design discharge pressure gage
                                                                                                 value of      engine
                                                     to reactor via fire protection system lines
                 Data Base for Unit-1
        date           Estimated flow Estimated flow
                        rate (m3/h)    rate (m3/h)                      Actions                                              Remarks
                       (Fresh water)    (Seawater)
                                                       ・21:45 to 23:50
 2011/03/12 21:45            0             10.8        Seawater injection by fire engines
                                                       temporarily halted
 2011/03/12 21:45            0              0
 2011/03/12 23:50            0              0
 2011/03/12 23:50            0             10.8        ・23:50                                     Flow rate is roughly estimated using discharge pressure gage
                                                       Seawater injection resumed                 value of fire engine and its design
                                                       ・March 14th 01:10 to 20:00
  2011/03/14 1:10            0             10.8        Seawater injection temporarily halted
                                                       because seawater inventory in the Unit-3
                                                       water pit decreased
  2011/03/14 1:10            0              0
 2011/03/14 20:00            0              0
 2011/03/14 20:00            0             10.8        ・20:00                                     Flow rate is roughly estimated using discharge pressure gage
                                                       Seawater injection resumed                 value of fire engine and its design
  2011/3/17 14:00            0             10.8

in service
out of service
                                      Water injection volume (averaged discharge flow rate) by Fire Engines (1) Unit-1

                            12
                                       Fresh water
                            10         Seawater
Averaged flow rate (m3/h)




                             8


                             6


                             4


                             2


                             0
                              3/11      3/12      3/12     3/13      3/13      3/14     3/14      3/15     3/15      3/16    3/16
                              12:00      0:00     12:00     0:00     12:00      0:00    12:00      0:00    12:00      0:00   12:00

				
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