Index (индекс)

Criticality safety index (CSI) (индекс безопасности по критичности (ИБК)) – a number defined for a package, overpack or cargo container with fissile nuclear materials, used for monitoring the total amount of packages and containers with fissile nuclear materials. (NP-053-04)

Comment

This term is fully equivalent to the same term in the IAEA Glossary – “Criticality Safety Index (CSI)” (Индекс безопасности по критичности (ИБК)).

Transport index (TI) (транспортный индекс (ти)) – a number assigned to a package, overpack, cargo container, reservoir or unpacked materials with low relative activity or with surface radioactive contamination, used for radiation safety control during transportation of radioactive materials. (NP-053-04)

Comment

A corresponding term in the IAEA Glossary is “Transport Index (TI)” (Транспортный индекс (ТИ)).

INDICATION (ИНДИКАЦИЯ) – information function of a control system aimed at displaying information for operations personnel with the aid of automated instruments. (NP-026-04)

INDUSTRIAL SITE (Промышленная площадка) – territory, on which main plant facilities are located. (PRB AS-99)

Comment

A corresponding term in the IAEA Glossary is “Site area” (Территория площадки).

INHERENT SAFETY OF REACTOR UNIT (ВНУТРЕННЯЯ САМОЗАЩИЩЕННОСТЬ РУ) – a property of the unit ensuring safety based on natural feedbacks, processes and characteristics. (OPB-12)

Comment

This term was introduced into the Russian regulatory framework under the influence of the Main safety principles of nuclear power plants (INSAG-3), issued by the International Nuclear Safety Advisory Group of the IAEA General Directorate in 1988, which were later updated in the report INSAG-12. However, neither these reports, nor IAEA standards or IAEA Glossary provide definition of the equivalent term. The term appears in the text dealing with safety principles as the “Inherent Safety” principle.

INITIAL CRITICALITY OF POWER UNIT (ФИЗИЧЕСКИЙ ПУСК БЛОКА АС) – see POWER UNIT STARTUP (ПУСК БЛОКА АС).

INITIAL STATE OF FULL SCOPE SIMULATOR (ИСХОДНОЕ СОСТОЯНИЕ ПМТ) – set of values of parameters of the simulator characterizing a specific state of the prototype unit, from which modeling process can start. (NP-003-97)

initiating event (Инициирующее событие)¹⁹ – event, occurrence of which leads directly to unsuccessful end state or can lead to such state in case of failure to perform safety functions. Based on the specifics of PSA methodology, IEs are divided into three classes: internal IE; IE caused by internal impacts; external IE: IE, caused by external impacts. (RB-032-04, RB-024-11)

Initiating event caused by external impacts (инициирующее событие, вызванное внешнним воздействием) – an initiating event caused by natural or technogenic phenomena, external with respect to the power unit. (RB-032-04)

Initiating event caused by internal impacts (инициирующее событие, вызванное внутренним воздействием) – an initiating event caused by fire, flood, missile, or other technogenic impact within the nuclear power unit, which is not an internal initiating event. (RB-032-04)

Internal initiating event (инициирующее событие внутреннее) – an initiating event caused by failures of plant systems and components, or errors of the plant personnel actions. (RB-032-04)

INITIATING EVENT (ИСХОДНОЕ СОБЫТИЕ) – failure of a plant system (component), external event or operator’s error, or combinations thereof defined in the Federal rules and regulations, leading to deviations from normal operation and creating a potential for violation of safe operation limits and (or) conditions. Initiating event includes all consequential dependent failures. (OPB-12)

Comment

A corresponding term in the IAEA Glossary is “Initiating event” (Исходное событие).

INSPECTION (ПРОВЕРКА) – in-service inspection of component or system in order to assess their operability or inoperability state and identify malfunctions. (OPB-12)

Comment

A corresponding term in the IAEA Glossary is “In-service inspection" (Инспекция в процессе эксплуатации).

installation organization (Монтажная организация) – organization performing installation of equipment and pipelines at a nuclear facility and (or) developing technology for installation. (PNAE G-7-008)

instrument (Средство измерений) – hardware designed for measurement purpose. (Federal Law No. 102-FZ “On ensuring unification of measurements”)

instrument GAUGING (follow-up calibration) (Поверка средств измерений) – complex of operations performed in order to verify compliance of instrumentation with metrological requirements. (Federal Law No. 102-FZ “On ensuring unification of measurements”)

INTEGRATED ENGINEERING AND RADIOLOGICAL SURVEY (ОБСЛЕДОВАНИЕ комплексное инженерное и радиационное (КИРО)) – complex of measures performed for designing nuclear power unit decommissioning activities and aimed at collection of information about technical state of buildings, structures, structural elements and equipment, as well as about radiological conditions in the rooms and on the site of the unit, volumetric and surface radioactive contamination of rooms, compartments, equipment and site of the plant unit, qualitative and quantitative composition of radioactive wastes at the unit. (NP-012-99)

INTEGRATED TEST OF ACTUATOR (ПРОВЕРКА КОМПЛЕКСНАЯ ИСПОЛНИТЕЛЬНОГО МЕХАНИЗМА) – test of actuator as a part of reactor protection and control system. (NP-086-12)

INTEGRATED TESTS OF FULL SCOPE SIMULATOR (КОМПЛЕКСНЫЕ ИСПЫТАНИЯ ПМТ) – see TESTS (ИСПЫТАНИЯ).

inter-balance period (Межбалансовый период) – period between two sequential physical inventory-takings. (NP-030-12)

interim storage of radioactive wastes (хранение радиоактивных отходов Промежуточное) – storage of radioactive wastes that were not brought into compliance with radioactive waste acceptance criteria. (Federal Law No. 190-FZ “On radioactive waste handling and amendments to some legislative acts of the Russian Federation”)

Comment

A corresponding term in the IAEA Glossary is “Interim storage” (Промежуточное хранение).

INTERLOCK (БЛОКИРОВКА) – control function aimed to prevent or terminate actions of personnel, automatics or equipment. (NP-026-04)

Intermediate Bulk Container (IBC) (Контейнер средней грузоподъемности для массовых грузов (КСГМГ)) – transportable packaging with the following properties:

a) inner volume of no more than 3 m³;

b) design, enabling mechanical processing of cargo;

c) resistant to loads occurring during handling and transportation of cargo, as confirmed by tests;

d) designed in accordance with the standards outlined in the chapter containing recommendations applicable to intermediate bulk containers, Recommendations of the United Nations Organization on transportation of especially hazardous cargos (section 16 of the UNO publication ST/SG/AC.10/1). (NP-053-04)

Comment

This term is fully equivalent to the same term in the IAEA Glossary “Intermediate Bulk Container (IBC)” (Контейнер средней грузоподъемности для массовых грузов (КСГМГ)

INTERVENTION (Вмешательство) – activities aimed at decreasing the probability, or dose, or harmful effects of radiation exposure of public during radiation accidents, in case of detection of radioactive contamination of environment or increased levels of natural radiation on territories, in buildings and structures. (NRB-99/2009)

Comment

A corresponding term in the IAEA Glossary is “Intervention” (Вмешательство).

INTERVENTION LEVEL (УРОВЕНЬ ВМЕШАТЕЛЬСТВА) – parameters and characteristics determining radiation situation and its dynamics, combination of which requires implementation of measures to protect personnel and public. (OPB-12)

Comment

A corresponding term in the IAEA Glossary is “Intervention level” (Уровень вмешательства).

INTERVENTION LEVEL (УРОВЕНЬ ВМЕШАТЕЛЬСТВА) – level of radiation factor, after exceedence of which certain protective measures should be undertaken. (NRB-99/2009, PRB AS-99)

inundation (Затопление) – formation of free surface of water on a territory as a result of high flood, storm surge or increased water level. (NP-064-05)