APR: your source for nuclear news and analysis since April 16, 2010

Wednesday, April 27, 2011

NISA 'instructs' TEPCO to report....

TEPCO has been ordered by NISA to provide an operational history, including all the way back to the original Great East Japan Earthquake, including all of the following parameters for all plants:

· The water level inside the Reactor Pressure Vessel
· The pressure inside the Reactor Pressure Vessel
· The temperature inside the Reactor Pressure Vessel
· The pressure inside the drywell of the Primary Containment Vessel
· The pressure inside the Pressure Suppression Chamber of the Primary
Containment Vessel
· The water level inside the Pressure Suppression Chamber of the Primary
Containment Vessel
· The temperature inside the Pressure Suppression Chamber of the Primary
Containment Vessel
· The temperature inside the Primary Containment Vessel
· Density of gas inside the Primary Containment Vessel
· The temperature inside the Spent Fuel Pool
· The flow rate of the Emergency Core Cooling System
· The density of radioactive materials at the exhaust outlet of radioactive
wastes and the emission monitoring facilities
· The contents of the alarms set off by the alarming devices
· The track record of the Isolation Cooling Condenser System
· The operation track record of the Reactor Core Isolation Cooling System
· The operation track record of the High Pressure Core Injection System
· The opening and closing track record of the Safety Relief Valves
· The opening and closing track record of the Primary Containment Vessel
Ventilation
· The track record of power securement and power restoration
· The operation track record of substitutional measures of water injection
such as fire pumps and seawater injection, etc.
· The track record of the treatment of accumulated water in the Turbine
Buildings, the Vertical Shaft, and the Duct for the outside

It was noted in the NISA order that these are necessary for NISA to ensure that TEPCO takes appropriate steps from here on out. Clearly, in addition to this, NISA wants to know the details of the several mentioned (and presently not functioning) core cooling systems to see what it can glean from this information (Isolation Condenser Cooling, HPCI, RCIC). It also wants records of relief valve lifts.

We don't want to start name calling early, but these sorts of orders continuing to occur are beginning to make it seem as if NISA is suspicious of TEPCO's management, or else is suspicious of its transparency, or at least suspicious of TEPCO's ability to collect and report this sort of data to it and the press. There is some data being updated a few times a day, which is mainly concerned with a few operable remotely indicated parameters, but this list is far more extensive than what is being reported now and has been detailed in immediate actions after the tsunami.

8:25 AM Eastern Wednesday 4/27
ATOMIC POWER REVIEW

1 comment:

  1. Just from what we think we know, this list is a bear.
    It seems unlikely that much of the instrumentation has survived the abuse it has received since March 11.
    Additionally, the site is nuclear swimming pool.
    So how is the skeleton crew on site to collect this data? Dipsticks?
    Maybe there is a separate need for reactors to have some basic, bulletproof instruments, much like airplanes do, so that when the system goes on the frizz, there is still a "limp home" mode that can be executed.

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