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research-article

Experimental demonstration of safety during extended SBO in an Integral Test Loop of a natural circulation BWR

[+] Author and Article Information
Arun Nayak

Reactor Engineering Division, Reactor Design and Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
arunths@barc.gov.in

Mukesh Kumar Dhiman

Reactor Engineering Division, Reactor Design and Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
mukeshd@barc.gov.in

Alok Kumar Vishnoi

Reactor Engineering Division, Reactor Design and Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
alokv@barc.gov.in

Vikas Jain

Reactor Engineering Division, Reactor Design and Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
jainv@barc.gov.in

Dinesh Kumar Chandraker

Reactor Engineering Division, Reactor Design and Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
dineshkc@barc.gov.in

1Corresponding author.

ASME doi:10.1115/1.4043198 History: Received September 30, 2018; Revised March 04, 2019

Abstract

Decay heat removal for prolonged period of Station Blackout (SBO) is a safety concern for the nuclear reactors. Aftermath of Fukushima, safety evaluation (performance analysis with severe conditions: stress test) of the reactor systems was carried out worldwide. It includes establishment of grace period of the reactors. Similar exercises for AHWR were also performed and the design of AHWR was established for its robustness against such events. Decay heat removal during extended SBO is such a condition to be qualified. In this regard, experiments in the integral test loop (ITL) were conducted for continuous 7 days of extended SBO. The design was evaluated from safety critical aspects during such an event experimentally. As a result of this experiment, it was concluded that the design of AHWR that includes Isolation condenser for decay heat removal, is capable to remove decay heat for 7 days of SBO with sufficient safety margins.

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