Safety of Soviet-designed nuclear powerplants : hearing by United States. Congress. Senate. Committee on Energy and

By United States. Congress. Senate. Committee on Energy and Natural Resources

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Additional info for Safety of Soviet-designed nuclear powerplants : hearing before the Committee on Energy and Natural Resources, United States Senate, One Hundred Second Congress, second session ... June 16, 1992

Sample text

Appropriate measures shall be taken to protect the occupants for a protracted time against hazards resulting from a severe accident. 88. After certain PIEs, various systems and components important to safety will need emergency power. It shall be ensured that the emergency power supply is able to supply the necessary power in any operational state or in a design basis accident, on the assumption of the coincidental loss of off-site power. The need for power will vary with the nature of the PIE, and the nature of the safety duty to be performed will be reflected in the choice of means for each duty; in respect of number, availability, duration, capacity and continuity, for example.

20. In the design of reactivity control devices, account shall be taken of wear-out, and effects of irradiation, such as burnup, changes in physical properties and production of gas. 21. The reactor coolant system, its associated auxiliary systems, and the control and protection systems shall be designed with sufficient margin to ensure that the design conditions of the reactor coolant pressure boundary are not exceeded in operational states. Provision shall be made to ensure that the operation of pressure relief devices, even in design basis accidents, will not lead to unacceptable releases of radioactive material from the plant.

In judging the adequacy of the means of shutdown, consideration shall be given to failures arising anywhere in the plant that could render part of the means of shutdown inoperative (such as failure of a control rod to insert) or could result in a common cause failure. 18. The means of shutdown shall be adequate to prevent or withstand inadvertent increases in reactivity by insertion during the shutdown, including refuelling in this state. In meeting this provision, deliberate actions that increase reactivity in the shutdown state (such as absorber movement for maintenance, dilution of boron content and refuelling actions) and a single failure in the shutdown means shall be taken into account.

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