You are hereBlogs / Ron Rubendra's blog / Japanese Reactor Safety following tsunami (Fukushima Daiichi)

Japanese Reactor Safety following tsunami (Fukushima Daiichi)


Ron Rubendra's picture

By Ron Rubendra - Posted on 13 March 2011

PDF versionSend to friendPrinter-friendly version

As many of you are aware Japan has recently suffered a major tsunami caused by one of the largest earthquakes in recorded history. There has been (a still be determined) enormous loss of life just from this and the situation is still developing.  

What we do know is that there has been major failures in the local infrastructure and judging by the tsunami footage that has been aired, this is not surprising .
As a consequence of this, one of the number of Japanese light water reactors at Fukushima (Unit 1 reactor at the Fukushima Daiichi nuclear power plant), close to the event, has suffered a catastrophic failure of its safety systems. The power reactors are boiling water reactors (BWRs) ranging between (439MW to 1067MW) (this compares to ANSTO’s OPAL research reactor in Sydney of 20MW). These are, I believe, LEU (low enriched uranium) reactors.
News reports indicate that a LOCA (loss of coolant accident) has occurred where the fuel rods are not able to be cooled. The primary coolant systems have failed, as have the backup systems (diesel and electric) from the effects of the tsunami. This has led to possible breach of fuel rod's cladding and the partial release of the source term (indicated by the iodine and caesium fission products) from the reactor containment (this has not been confirmed). The Japanese nuclear authorities have begun implementing their safety management plans and have attempted to flood the reactor with sea water (with boron as a moderator) to try to keep it cool and reduce the nuclear interactions.
The closest residents have been evacuated and they have also started iodine prophylaxis with surrounding residents and implementation procedures to reduce inhalation and ingestion hazards.
The IAEA report that this is a INES Level 4 event ('Accident with Local Consequences') here  
The dose rate was reported to peak at a maximum of 1.2 mSv/hr at the outside of the reactor plant. Other reports indicate 0.065mSv/hr in reactor control room. Other reports of ~100 mSv are here which if correct are significant but not fatal (LD50 is ~5000mSv).  
The NYT has articles here and here  
Background (from here)
·         Japan needs to import some 80% of its energy requirements.
·         Its first commercial nuclear power reactor began operating in mid 1966, and nuclear energy has been a national strategic priority since 1973.
·         The country's 54 reactors provide some 30% of the country's electricity and this is expected to increase to at least 40% by 2017.
·         Japan has a full fuel cycle set-up, including enrichment and reprocessing of used fuel for recycle.
Please discuss and add information.
Thanks
Ron
Ron Rubendra's picture

There's been a lot more news reporting on more events at the reactor. Some of it, I feel, is a bit sensational. The IAEA have some more rational reporting here .

(Let's not forget that while focus on the safety of the reactors is important - the whole east coast is still suffering from the effects of the earthquake/ tsunami and the associated recovery is underway).

Ron Rubendra MARPS

Ron Rubendra's picture

Reported in today's papers that radiation levels are back to normal here

Ron Rubendra MARPS

ARPS Sponsors

Radiation Advice & Solutions Pty Ltd
116 Penning Drive, South Maclean Qld 4280
Contact: Mark Sonter
Tel: +61 7 3297 7653
Fax: +61 7 3297 7653
Email: sontermj@tpg.com.au

 

Domo-Technica Pty Ltd
PO Box 7077, Silverwater NSW 2128
Contact: Michael Anderson
Tel: +61 2 9748 6988
Fax: +61 2 9748 7855
Email: sales@domotech.com.au
Website: http://www.domotech.com.au

Radsmart
13 Cassandra Crescent, Heathcote NSW 2233
Contact: Gordon Mackenzie
Tel: +61 2 9520 6340, 0409 600 646
Email: info@radsmart.com.au
Website: www.radsmart.com.au

Medical and Scientific Services Pty Ltd

255 Marmion St
Cottesloe  WA  6011

Contact: Jonathon Thwaites
Tel: 0419 924 355
Email: jthwaites@admin.uwa.edu.au

InMed Pty Ltd
37/5 Inglewood Place, Baulkham Hills NSW 2153
Contact: Jeff Gibson
Tel: 1300 364 336
Fax: +61 2 8814 5477
Email: sales@inmed.com.au
Website: http://www.inmed.com.au

Tracerco

2 Harris Road, Malaga WA 6090

Web: www.tracerco.com
Email: admin.aus@tracerco.com

Tel: +61 8 9209 3905
Fax: +61 8 9241 9550

Bartolo Safety Management Service
PO Box 264
Jannali  NSW  2226

Contact: William Bartolo
Tel: 02 9528 7676
Fax: 02 9528 7676
Email: bartolo-safety@hotkey.net.au

RADIATION SAFETY SERVICES PTY LTD
Lot J Mackay Marina, Mackay Qld 4720
Tel: +61 7 4955 5944, Fax: +61 7 4965 7099
Email: rss@realtimegrp.com.au
Website: www.radiationsafety.com.au
Perth Office: Tel: +61 8 9475 0099
Melbourne Office: Tel: +61 3 8371 0003

Australian Radiation Services Pty Ltd
PO Box 3103, Nunawading Vic 3131
Contact: Joseph Young
Tel: +61 3 9877 4898
Fax: +61 3 9877 8272
Email: info@australian-radiation-services.com.au
Website: http://www.australian-radiation-services.com.au

 

Calytrix  Consulting Pty Ltd
P.O. Box 83, Stoneville, WA, 6081
Contact:  Nick Tsurikov
Tel:  0405 400 174
Email: nick@calytrix.biz
Website: www.calytrix.biz




SARadiation Pty Ltd
7 Crossley Street
ERINDALE  SA  5066

Contact: Kent Gregory
mobile: 0410 388 018
email:     kent@saradiation.com.au
website:
www.saradiation.com.au



ARPS Tag Cloud

Who's new

  • Peter Douglas
  • Andrew Yule
  • Tracerco
  • Neha Kodwani
  • Aqeel Akber

Who's online

There are currently 0 users and 1 guest online.

Shout Box

There are no shouts to view.
Login or register to post shouts
All Shouts

Events

« October 2014 »
SuMoTuWeThFrSa
1234
567891011
12131415161718
19202122232425
262728293031