operating models operating modes operating name operating noise operating normally operating now operating nuclear operating off operating officer operating on him operating on me operating on the market operating on the same operating options operating organization operating out operating panel operating parameter operating parameters operating part operating partner operating performance operating period operating permit operating permits operating personnel operating phase operating phases operating plan operating platform operating point operating points operating policies operating position operating positions operating power operating practices operating pressure operating pressures operating principle operating principles operating problems operating procedure operating procedures operating process operating processes operating profit operating profit margin operating profits operating program operating properly operating protocol operating range operating ranges operating rate operating ratio operating reactors operating regulations operating reliability operating requirements operating reserve operating reserves operating restrictions operating result operating results operating revenue operating revenues operating right operating rod operating room operating rooms operating rules operating safety operating schedule operating season operating section operating security operating segment operating segments operating sequence operating services operating simultaneously operating site operating sites operating situation operating software operating sounds operating space operating speed operating speeds operating staff operating standards operating state operating states operating station operating status operating step operating steps operating structure