physics

ONDRAF

ONDRAF is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand ONDRAF rather than just read about it. In short: ONDRAF/NIRAS (Dutch: Nationale instelling voor radioactief afval en verrijkte Splijtstoffen, French: Organisme national des déchets radioactifs et des matières fissiles enrichies, German: Nationale Einrichtung für Radioaktive Abfälle und angereicherte Spaltmaterialien) is the Belgian National Agency for Radioactive Waste and enriched Fissile Material. It is established by Belgian law since 1980.

Key takeaways

ONDRAF belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect ONDRAF to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of ONDRAF from memory before moving on to harder problems.

Reference excerpt

ONDRAF/NIRAS (Dutch: Nationale instelling voor radioactief afval en verrijkte Splijtstoffen, French: Organisme national des déchets radioactifs et des matières fissiles enrichies, German: Nationale Einrichtung für Radioaktive Abfälle und angereicherte Spaltmaterialien) is the Belgian National Agency for Radioactive Waste and enriched Fissile Material. It is established by Belgian law since 1980.

Belgoprocess Belgoprocess is the industrial subsidiary. It manages and executes the industrial activities of the agency. Belgoprocess was founded in 1984 as a subsidiary of Synatom nv. Synatom is the Electrabel subsidiary that manages the fuel cycle for the commercial reactors in Belgium. In 1985 Belgoprocess acquired the staff from Eurochemics. A pilot nuclear reprocessing plant which was being decommissioned. In 1986 Belgoprocess was transferred to ONDRAF/NIRAS. The Site of the former Eurochemics plant in Dessel is known as Belgoproces Site 1. In 1989 Belgoprocess also took over the waste department of SCK•CEN, the study center for nuclear research, in Mol now also known as Belgoproces Site 2.

Site ONDRAF Fleurus In 2012 ONDRAF/NIRAS became responsible for the premises of the now defunct American company Best Medical Belgium, located on the site of the Institute for Radioelements(IRE) in Fleurus Belgium.

Long term storage

cAt-project The cAt-project aims to offer a storage solution for low and intermediate radioactive waste with a short half-life (less than 30 years), so called category A waste. It is to be encased in modular concrete boxes which are stacked inside structures which ultimately will resemble tumuli on a site adjacent to Belgoprocess Site 1. This structure is to be actively monitored for 300 years.

HADES HADES is an underground laboratory, since 1980 it is researching if layers of clay as found in the North-East of Belgium could be used for permanent storage of nuclear waste. It is run by ONDRAF/NIRAS and SCK•CEN through EIG EURIDICE (European Underground Research Infrastructure for Disposal of nuclear waste In Clay Environment).

In 2011 ONDRAF/NIRAS published the Waste Plan which evaluates all proposed storage solutions and concludes by recommending storage it in the aforementioned layers of clay.

References

External links official website Archived 2012-11-12 at the Wayback Machine official website of Belgoprocess ONDRAF profile Archived 2016-03-05 at the Wayback Machine Clay geology in Belgium(behind a paywall) More clay(behind a paywall) Belgian Nuclear Society flyer FANC Wobbing Archived 2012-04-02 at the Wayback Machine IAEA

Worked examples

Example 1 — a first encounter with ONDRAF

Start with the simplest possible case. Write down what ONDRAF claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to ONDRAF before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about ONDRAF ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of ONDRAF

In research: ONDRAF appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses ONDRAF in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: ONDRAF is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1980 establishments in Belgium, Government agencies established in 1980, Government agencies of Belgium, so understanding it makes those chapters shorter.
In everyday life: Look for ONDRAF outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study ONDRAF in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what ONDRAF means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain ONDRAF out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is ONDRAF in simple terms?

Why does ONDRAF matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study ONDRAF?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on ONDRAF.