Temperatures measured at the bottom of the Unit 3 Reactor Pressure Vessel at Fukushima Daiichi Nuclear Power Station
Here are the measurement results of temperatures at the bottom of the Unit 3 Reactor Pressure Vessel at Fukushima Daiichi Nuclear Power Station.
Monitoring points
Temperature
- Temperature Unit:℃、Water Injection Unit：m3/h
○Measurement value
(2025/04/03 11:00)
| Temp(1) | Temp(2) | Temp(3) | Temp(4) | Temp(5) | Temp(6) | Water Injection |
| 18.2 | 16.6 | 16.8 | 16.8 | 16.1 | 15.6 | 3.8 |
The meaning of the name in the graph and the table is shown below:
Temp(1) VESSEL BOTTOM ABOVE SKIRT JOT(TE-2-3-69F1)
Temp(2) VESSEL BOTTOM ABOVE SKIRT JOT(TE-2-3-69F2)
Temp(3) VESSEL BOTTOM ABOVE SKIRT JOT(TE-2-3-69F3)
Temp(4) VESSEL WALL ABOVE BOTTOM HEAD(TE-2-3-69H1)
Temp(5) VESSEL WALL ABOVE BOTTOM HEAD(TE-2-3-69H2)
Temp(6) VESSEL WALL ABOVE BOTTOM HEAD(TE-2-3-69H3)
Water Injection Volume of water injection to RPV
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For reference: The following is the “Limiting Conditions of Operations” designated in the implementation plan for temperatures
at the bottom of the Reactor Pressure Vessel:
・Temperature at the bottom of the Reactor Pressure Vessel: Within 80℃
Announcement
- On March 26, 2021, temperatures at 3 points (TE-2-3-69L1, TE-2-3-69L2 and TE-2-3-69L3) in the Bottom Head section of the Unit 3 Reactor Pressure Vessel (RPV) were excluded from planned data monitoring. Accordingly, “Temperature measurement points (Figure)” have been updated.
- Data may change or be missing due to equipment failure or regular inspections.
- Temperature may change due to change of water injection flow rate to the reactor.
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Instrument equipment is removed, installed or inspected for regular inspections at Unit 1 - 4.
During the work period, the indicated value will fluctuate or be absent, but the equipment will return to a measureable state at a defined time.
