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research-article

ANALYSIS OF LOSS OF HEAT SINK FOR ITER DIVERTOR COOLING SYSTEM (new Tungsten divertor design) USING MODIFIED RELAP/SCDAPSIM/MOD 4.0

[+] Author and Article Information
Satya Prakash Saraswat

Nuclear Engineering and Technology Programme, Indian Institute of Technology Kanpur, Kanpur 208016, India
satyasar@iitk.ac.in

Dipanjan Ray

Engineering and Technology Programme,Indian Institute of Technology Kanpur, Kanpur 208016, India
dipanjan@iitk.ac.in

Prabhat Munshi

Nuclear Engineering and Technology Programme,Indian Institute of Technology Kanpur, Kanpur 208016, India
pmunshi@iitk.ac.in

Chris Allison

Innovative Systems Software, Idaho Falls, ID 83406, USA
iss@cableone.net

1Corresponding author.

ASME doi:10.1115/1.4042707 History: Received April 25, 2018; Revised January 17, 2019

Abstract

The present work includes thermal hydraulic modeling and analysis of Loss Of Heat Sink (LOHS) accident for the ITER divertor cooling system. The analysis is done for new design of full tungsten divertor. The new design is also analyzed for different local heat loads ranging from 10 MW/m2 to 20 MW/m2 (while maintaining the total heat load 200 MW) under the steady state fluid conditions. The LOHS event is selected since divertor is the most sensitive component to loss or reduction in coolability of divertor primary heat transport system as it receives large heat flux from plasma. The main objective of this analysis is to find margins to unwanted conditions like overstress temperatures of structure and elevated water level in pressurizer. The analysis is done by modified thermal hydraulic code RELAP/SCDAPSIM/MOD 4.0. The results obtained are compared with results of old divertor design which uses CFC layer to show that how the new design of divertor behaves compared to the older design under the accident scenario. A detailed model of DV-PHTS loop and its ancillary system is presented. The analysis shows that under the accident scenario (a) the divertor structure temperature at the critical sites (Inner Vertical Target (IVT) and Outer Vertical Target (OVT)) is always with in the design limit and does not affect the structural integrity of the divertor. (b) The water level in the pressurizer increases moderately and finely controlled by the PID controller and pressurizer safety valve does not open.

Copyright (c) 2019 by ASME
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