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TeachMeFinance.com - explain Reactivity Reactivity The term 'Reactivity' as it applies to the area of nuclear science can be defined as ' A term expressing the departure of a reactor system from criticality. A positive reactivity addition indicates a move toward supercriticality (power increase). A negative reactivity addition indicates a move toward subcriticality (power decrease). '. Previous 5 Terms: reach Reactance Reaction Reactive power Reactive Power Next 5 Terms: Reactor coolant system Reactor core Reactor Oversight Process (ROP) Reactor, nuclear Ready reserve About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.