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Table 2: Unit 2 Reactor: Fukushima Daiichi Nuclear Power Plant - 18 May 2011

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Table 2: Unit 2 Reactor: Fukushima Daiichi Nuclear Power Plant - 18 May 2011

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Table 2: Unit 2 Reactor: Fukushima Daiichi Nuclear Power Plant - 18 May 2011

  1. 1. TABLE 2. UNIT 2 REACTOR: FUKUSHIMA DAIICHI NUCLEAR POWER PLANT: 18 MAY 2011 ASSESSMENT OF STATUS IN TERMS OF FUNDAMENTAL SAFETY FUNCTIONS FOR ACHIEVING A SAFE STATE TEPCO Roadmap Necessary safety function and conditions Observation Evaluation of safe state countermeasures Reactor is subcritical and sub-criticality is - No power spike or power increase ACHIEVED No additionalControl ofReactivity demonstrated and maintained - No significant neutron flux measured and reported Caution: countermeasures reported - Short lived fission products are not reported at the - Continue detection of neutrons The need for boric moment (e.g. La-140) and short-lived isotopes injection is investigated by TEPCO Stable cooling shall be assured - Reactor vessel temperature is: (115.1 °C at NOT ACHIEVED Nos 1, 3, 4, 7, 8, 9, 13, 14, - Keep the coolant temperature feedwater nozzle, reactor pressure vessel Establishment of a long term closed- 16 and 17 Residual heat removal sufficiently below the boiling point at pressure ≤ 1.0 atm based on available loop heat removal circuit is advised atmospheric pressure measurements) - Cover the damaged core adequately - Water level of reactor core is below about with water −1500 mm (A) and −2100 mm (B) from the top - Off-site and back-up power supply of active core shall be available - Off-site power supply and backup power from - Achievement of long term closed-loop portable diesel generators are available heat removal capability - Fresh water injection is provided; however, closed-loop heat removal is not yet established - Containment is leak-tight - Containment is believed to be damaged: latest NOT ACHIEVED Nos 2, 6, 11 and 15 - Containment pressure is maintained measurements show the containment pressure to - Measures to make theContainment below design limits be around atmospheric integrity containment leak-tight should - Hydrogen explosion to be prevented. - Containment probably damaged following be pursued hydrogen explosion at this unit at 21:14 UTC on - Pressure and H2 concentration of 14 March 2011 the containment to be further monitored - Reactor pressure vessel (including - Reactor pressure vessel is assumed to be NOT ACHIEVED Nos 5, 10, 29–46, 50, 54 radioactive material connected systems) should not leak; or leaking, most probably through connected Construction of a cover above the and 55 if so the leakage shall be confined recirculation system (pump seal loss of coolant reactor building has to be pursued Confining within allowable limits accident) - Leakages from the containment should - Containment is believed to be damaged: latest be prevented or controlled, or shall be measurements show the containment pressure confined and reactor pressure vessel pressure to be around atmospheric[Type text]
  2. 2. TEPCO Roadmap Necessary safety function and conditions Observation Evaluation of safe state countermeasures - No additional releases shall be - Intermittent releases have been observed NOT ACHIEVED Nos 12, 47–49, 51–53, 55– anticipated - Radiation monitors are available Measures to prevent radioactive 63Limiting effects of releases - Radiation monitoring measurements - White smoke is observed emanating releases and leaking of water with The transfer of stagnant shall be available continuously from the reactor building high level radioactivity to the water from the turbine - Samples of water in the turbine building floor environment should be further building to the radioactive area show high radioactivity releases from the pursued waste treatment facilities is reactor and the containment to the environment continuing Work to block the trench pit to prevent release of water with high level radioactivity to the environment is continuingSpent fuel pool of Unit 2About 56 tonnes of fresh water was injected into the spent fuel pool of Unit 2 via the fuel pool cooling and clean-up line from 04:09 until 05:45UTC on 10 May.Hydrazine was injected from 04:19 UTC until 05:35 UTC on 10 May.The temperature of the pool was 47 °C at 20:00 UTC on 16 May.

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