Reflections on the Fukushima Daiichi Nuclear Accident by Joonhong Ahn Cathryn Carson Mikael Jensen Kohta Juraku Shinya Nagasaki & Satoru Tanaka

Reflections on the Fukushima Daiichi Nuclear Accident by Joonhong Ahn Cathryn Carson Mikael Jensen Kohta Juraku Shinya Nagasaki & Satoru Tanaka

Author:Joonhong Ahn, Cathryn Carson, Mikael Jensen, Kohta Juraku, Shinya Nagasaki & Satoru Tanaka
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham


The heat exchanger tubes are slightly inclined. Both inlet and discharge lines are connected to the shielding/storage pool and are open during normal operation. When the temperature increases inside the containment, the water in the CCC starts to heat up so that a natural circulation flow establishes in the system.

Passive Pressure Pulse Transmitter

The passive pressure pulse transmitters (PPPT) function without electric power supply, external media, or actuation via I&C signals. The PPPTs serve to initiate scram, containment isolation of main steam lines, and automatic depressurization of the RPV. The PPPT consists of a small heat exchanger connected to the RPV via a non-isolatable pipe, as shown in Fig. 12.8.

Fig. 12.8Passive pressure pulse transmitter [13]



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