a best estimate source sequence

English translation: order, timing and quantity of the release of radioactive sources

20:24 Oct 3, 2016
English language (monolingual) [PRO]
Science - Nuclear Eng/Sci
English term or phrase: a best estimate source sequence
Numerous specialized (non-standard) requests were also made by the IAEA to refine and apply a best estimate source sequence for atmospheric transport modelling (ATM ) calculations. Simulations were performed on high resolution (5 km grid mesh) and medium resolution (50 km grid mesh) to estimate the atmospheric spreading in the immediate region, and for greater distances (trans-North Pacific), respectively.
Masoud Kakouli Varnousfaderani
Türkiye
Local time: 16:10
Selected answer:order, timing and quantity of the release of radioactive sources
Explanation:
The model of atmospheric spreading needs input values, these are:
- date and time of each release
- quantity of each release
the order of these releases is the best estimate sequence, estimate because there are uncertainties about the exact time and quantities
In case of an explosion the time is rather precisely defined, but a leaking buidling may have very large uncertainty for the rate of release, and quantities may be widely unknown, and reestimated after comparison of the model to the actually observed values
Selected response from:

Didier Fourcot
Local time: 14:10
Grading comment
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
3 +2best estimate of the characteristics of release events in a nuclear accident
Piyush Ojha
4 +1order, timing and quantity of the release of radioactive sources
Didier Fourcot


Discussion entries: 1





  

Answers


2 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +2
best estimate of the characteristics of release events in a nuclear accident


Explanation:
Slides 10 and 11 of the presentation referenced below give some indication of what is meant. It seems a source term refers to a single event of release of radioactive material and a source sequence is a sequence of such events within a geographical area and time span sufficiently small to be regarded as a single episode (i.e. accident). A source term is characterised by its geographic location, duration of the event, rate of release (which varies during the event), kind of radioactive material released etc. It seems from slide 11 that there were four events in Fukushima (each contributing one term to the source sequence): explosions at Reactors 1, 3 and 2 respectively (in that order), followed by a fire near Reactor 4.

A best estimate source sequence is just that, a source sequence constructed as well as one can from measurements taken near the site.


    https://www.wmo.int/pages/prog/sat/meetings/documents/CBS-MG-12_Doc_03-01-08_EER.ppt
Piyush Ojha
United Kingdom
Local time: 13:10
Native speaker of: Native in EnglishEnglish, Native in HindiHindi
PRO pts in category: 8

Peer comments on this answer (and responses from the answerer)
agree  Yvonne Gallagher: yes, and 2 terms being asked here
10 hrs

agree  Yasutomo Kanazawa
12 hrs
Login to enter a peer comment (or grade)

12 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +1
order, timing and quantity of the release of radioactive sources


Explanation:
The model of atmospheric spreading needs input values, these are:
- date and time of each release
- quantity of each release
the order of these releases is the best estimate sequence, estimate because there are uncertainties about the exact time and quantities
In case of an explosion the time is rather precisely defined, but a leaking buidling may have very large uncertainty for the rate of release, and quantities may be widely unknown, and reestimated after comparison of the model to the actually observed values

Didier Fourcot
Local time: 14:10
Works in field
Native speaker of: Native in FrenchFrench
PRO pts in category: 24

Peer comments on this answer (and responses from the answerer)
agree  acetran
1 day 4 hrs
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