AN EVALUATION OF CLIFF-EDGE EFFECT UNDER SBO AND LOSS OF EPS SYSTEM COMBINED WITH LOSS OF UHS FOR THE AGED CANDU-6 REACTOR


37th Annual CNS Conference - 2017 June 04-07

Presented at:
37th Annual CNS Conference
2017 June 04-07
Location:
Niagara Falls
Session Title:
2B2 - Thermalhydraulics (II)

Authors:
E.K. Jang (Nuclear Engineering Service & Solution)
S.R. Kim (Nuclear Engineering Service & Solution)
S.D. Yi (Nuclear Engineering Service & Solution)
  

Abstract

This paper deals with the thermal-hydraulic behaviors as affected by the degree of aging in the Primary Heat Transport System (PHTS) under Station Blackout (SBO) and loss of Emergency Power System (EPS) combined with loss of Ultimate Heat Sink (UHS). A cliff-edge effect occurs on a Nuclear Power Plant (NPP) under the severe accident condition. The aging in the PHTS that can affect the cliff-edge leads to lower heat transfer capacity from the primary side to its secondary side, and the overall PHTS behaviors are affected by the aged conditions. Assessments of the NPP under the severe accident condition have become essential to ensure the NPP safety after Fukushima accident. The sensitivity study on the postulated accident is conducted for the aged CANDU-6 reactor. This paper presents that the operator action time get faster to prevent proceeding to the severe accident as aging in the PHTS proceeds.

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