Writing Academic English 4th Edition

82 Partn IWritinganEssay

MODEL

Chronological

OrderEssay

(Process)

INTRODUCTORY

PARAGRAPH

BODYPARAGRAPH 1

UnderstandingChernobyl

A nuclearpowerplantcontainsa nuclearreactorthatusescontrollednuclear

fissionstoproduceelectricity.The.reactorconsistsoffuelrodsalternatingwith

controlrodsinsidea verylargecontainercalledthereactorcore.Thefuelrods

containrqdioactivefuelsuchasuranium-235,andthecontrolrodscontain

neutron^6 -absorbing^7 substancessuchasboronandcadmium.Byvaryingthe

depthofthecontrolrodswithinthecore,onecanincreaseordecreasethe

absorptionofneutrons,therebyspeedinguporslowingdownthefissionprocess.

If necessary,therodscanbedroppedallthewayintothecoretostopthe

Ifeverishly:veryquickly

2contamination:pollution

3catastrophic:terrible,disastrous

4justified:appropriate,right

snuclearfission:nuclearreactionresultingfromsplittinga nucleus

6neutron:electricallyneutralparticleinsideanatom

7 absorbing:takinginsideitself,asa spongeabsorbswater