physics

WASH-740

WASH-740 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 WASH-740 rather than just read about it. In short: WASH-740 was a report published by the U.S. Atomic Energy Commission (USAEC) in 1957.

Key takeaways

WASH-740 belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WASH-740 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WASH-740 from memory before moving on to harder problems.

Reference excerpt

WASH-740 was a report published by the U.S. Atomic Energy Commission (USAEC) in 1957. This report, called "Theoretical Possibilities and Consequences of Major Accidents in Large Nuclear Power Plants" (also known as "The Brookhaven Report"), estimated maximum possible damage from a meltdown with no containment building at a large nuclear reactor. The conclusions of this study estimated the possible effects of a "maximum credible accident" for nuclear reactors then envisioned as being 3400 deaths, 43,000 injuries and property damage of $7 billion ($57bn adjusted for inflation in 2012 since 1957). The estimate of probability was one in a hundred thousand to one in a billion per reactor-year. When WASH-740 was revised in 1964-65 to account for the larger reactors then being designed, the new figures indicated that there could be as many as 45,000 deaths, 100,000 injuries, and $17 billion in property damage ($125bn adjusted for inflation since 1964). However, the assumptions underlying the results were unrealistic (including the worst meteorological conditions, no containment building, and that half the reactor core is released into the atmosphere as micrometre-sized pellets without any examination of how this might occur). These were due to conservatism (estimating the maximum possible damage) and the need to use atomic bomb fallout data, which had been collected from tests (computers in 1955 being greatly insufficient to do the calculations). As knowledge, models and computers improved the conclusions of this report were replaced by those of first WASH-1400 (1975, The Rasmussen Report), then CRAC-II (1982), and most recently NUREG-1150 (1991). Now all of these studies are considered obsolete (see the disclaimer to NUREG-1150), and are being replaced by the State-of-the-Art Reactor Consequence Analyses (SOARCA) study.

See also Nuclear safety in the U.S. Nuclear power Nuclear power plant Nuclear accidents in the United States WASH-1400

External links Serious Accidents (in Nuclear Power Plants) Nuclear Power Pro/Con History of WASH-740 Archived 2006-05-18 at the Wayback Machine Reactor Safety: 1953-1978 Archived 2006-10-16 at the Wayback Machine The 1957 WASH-740 report

Worked examples

Example 1 — a first encounter with WASH-740

Start with the simplest possible case. Write down what WASH-740 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 WASH-740 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 WASH-740 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 WASH-740

In research: WASH-740 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 WASH-740 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: WASH-740 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Nuclear power stubs, Nuclear safety and security, United States Atomic Energy Commission, so understanding it makes those chapters shorter.
In everyday life: Look for WASH-740 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 WASH-740 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WASH-740 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 WASH-740 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WASH-740 in simple terms?

WASH-740 was a report published by the U.S. Atomic Energy Commission (USAEC) in 1957.

Why does WASH-740 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 WASH-740?

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 WASH-740.