Title: Temperature rises sharply at Fukushima reactor
Source: AJW by The Asahi Shimbun
Date: February 06, 2012
Tokyo Electric Power Co. reported a spike in temperature in the No. 2 reactor at the crippled Fukushima No. 1 nuclear power plant on Feb. 5, forcing it to increase the volume of cooling water there as a precautionary step.
TEPCO said cooling water may not have reached part of the fuel in the reactor’s pressure vessel while it switched to different piping for injecting water and changed the volume of water.
According to TEPCO, a thermometer at the bottom of the pressure vessel measured 71.7 degrees as of 4 p.m. Feb. 5, up from 52 degrees on Feb. 1. [...]
[T]hermometer readings can sometimes be out by as much as 20 degrees. Therefore, a reading exceeding 80 degrees could mean that conditions for cold shutdown have been compromised. [...]
TEPCO will analyze gas in the reactor within a few days to check whether a chain of nuclear fission has occurred again in the melted fuel.
Read the report here
Published: February 6th, 2012 at 2:42 am ET
- Bloomberg: “Nuclear reaction threat” as temperature rises — Head of Japan nuke institute: “Nobody is sure about the location of melted fuel — A similar incident will probably occur again” February 7, 2012
- Defective Meter? Temperature in Reactor 2 doubles, rises above 100ºC — Tepco assuming low possibility of re-criticality January 14, 2012
- Exposed? Asahi: Water may not be reaching part of melted nuclear fuel from Reactor No. 2, says unnamed Tepco official February 7, 2012
- Asahi: Reactor No. 2 temperature stays high despite Tepco’s stabilization effort — Was back up to 72°C February 8, 2012
- Reactor No. 2 temperature shoots to 75°C — Tepco increasing water injections again — 5°C from warning level February 11, 2012