PSAM 16 - Paper Overview

PSAM 16 Conference Paper Overview

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Lead Author: Ching-Han Chen Co-author(s): none

Risk Assessment for Loss of Component Cooling Water Scenarios Based on WOG2000 Model and Considering the Effectiveness of RCP Passive Shutdown Seal
For pressurized water reactors (PWR), the biggest concern with losing component cooling water (CCW) is that the centrifugal charging pump (CCP) has to be manually tripped within 10 to 15 minutes of losing cooling, thus losing the reactor coolant pump (RCP) seal injection flow and thermal barrier cooling. In this situation, the RCP seal will be exposed to the high-temperature primary side cooling water and lead to RCP seal fail, resulting in loss of coolant accident (LOCA). To cope with this issue, many nuclear power plants have decided to replace the RCP seal by the new passive thermal shutdown seal (PSDS). The PSDS is a fail-safe protection device that will significantly reduce leakage from the RCP seal in case of loss of cooling. In Taiwan, Maanshan Nuclear Power Plant (MNPP) has accomplished the installation of RCP passive shutdown seal. Therefore, the purpose of this paper is to evaluate the benefits of RCP passive shutdown seal in the loss of component cooling water scenarios based on WOG2000 model proposed by the Westinghouse Owners Group (WOG) in WCAP-15603-NP, Rev.1. The assessment results show that the overall risk of loss of component cooling water scenarios can be reduced by about two orders of magnitude. The constructed probability risk assessment (PRA) model will be discussed in more detail in the paper and the difference between base and WOG2000 model will also be presented.

Risk Assessment for Loss of Component Cooling Water Scenarios Based on WOG2000 Model and Considering the Effectiveness of RCP Passive Shutdown Seal

For pressurized water reactors (PWR), the biggest concern with losing component cooling water (CCW) is that the centrifugal charging pump (CCP) has to be manually tripped within 10 to 15 minutes of losing cooling, thus losing the reactor coolant pump (RCP) seal injection flow and thermal barrier cooling. In this situation, the RCP seal will be exposed to the high-temperature primary side cooling water and lead to RCP seal fail, resulting in loss of coolant accident (LOCA). To cope with this issue, many nuclear power plants have decided to replace the RCP seal by the new passive thermal shutdown seal (PSDS). The PSDS is a fail-safe protection device that will significantly reduce leakage from the RCP seal in case of loss of cooling. In Taiwan, Maanshan Nuclear Power Plant (MNPP) has accomplished the installation of RCP passive shutdown seal. Therefore, the purpose of this paper is to evaluate the benefits of RCP passive shutdown seal in the loss of component cooling water scenarios based on WOG2000 model proposed by the Westinghouse Owners Group (WOG) in WCAP-15603-NP, Rev.1. The assessment results show that the overall risk of loss of component cooling water scenarios can be reduced by about two orders of magnitude. The constructed probability risk assessment (PRA) model will be discussed in more detail in the paper and the difference between base and WOG2000 model will also be presented.

Paper CH88 Preview

Author and Presentation Info

Lead Author Name: ChingHan Chen (chinghan@iner.gov.tw)

Bio:

Country: Taiwan
Company: Institute of Nuclear Energy Research, Atomic Energy Council
Job Title: Assistant Researcher

PSAM 16 Conference Paper Overview

Welcome to the PSAM 16 Conference paper and speaker overview page.

Paper CH88 Preview

Author and Presentation Info

Download paper CH88.