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Additional resources for Accid. Anal. - Nuclear Powerplants with PHWRs

Example text

The fuel channels should not fail due to overheating. Relevant event combinations None. 6. 1. Initiating events A loss of Class IV electric power to the HTS pumps causes them to run down and eventually stop. Particular cases of partial loss of forced circulation include a partial loss of Class IV power, a single HTS pump shaft seizure and a single pump trip. 2. Safety aspects Flow reduction causes a mismatch between reactor power and coolant flow that can lead to fuel overheating and HTS pressurization.

NS-R-1, IAEA, Vienna (2000). [2] INTERNATIONAL ATOMIC ENERGY AGENCY, Safety Assessment and Verification for Nuclear Power Plants, Safety Standards Series No. 2, IAEA, Vienna (2001). [3] INTERNATIONAL ATOMIC ENERGY AGENCY, Accident Analysis for Nuclear Power Plants, Safety Reports Series No. 23, IAEA, Vienna (2002). [4] ATOMIC ENERGY CONTROL BOARD, Draft Regulatory Guide C-006 (Rev. 1): Safety Analysis of CANDU Nuclear Power Plants, AECB, Ottawa (1999). [5] ATOMIC ENERGY CONTROL BOARD, Requirements for Shutdown Systems for CANDU Nuclear Power Plants, AECB Regulatory Policy Statement R-8, AECB, Ottawa (1999).

Because the PHWR HTS is near saturation, limited film boiling does not lead to an excessive sheath temperature rise. dual failure. Single failure plus assumed unavailability of a special safety system or subsystem. end-fitting. Mechanical component at each end of a fuel channel which permits a connection to the feeder pipe. event class. For the purposes of accident analysis, AECB (Canada) divides events into five event classes, generally on the basis of frequency. Each event class has its own public dose acceptance criterion.

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