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Extended Station Blackout Analysis for VVER-1000 MWe Reactor

Abstract

Post Fukushima, the plant behaviour for an extended station black-out (ESBO) scenario with only passive system availability for about 7 days has become imperative. Thermal hydraulic analysis of ESBO with the availability of passive heat removal system (PHRS), passive first stage and second stage hydro accumulators were carried out to demonstrate the design capabilities. Two different cases having primary leak rates of 2.2 tons/hr and 6.6 tons/hr were analyzed to study sustenance of natural circulation. For the study, out of 4 PHRS trains, one PHRS train was assumed to be in failure mode. The objective here is to predict the core cooling capability for a period of 7 days under ESBO conditions with the available water inventories from first and second stage hydroaccumulators only. Over simplified energy balance studies cannot ascertain sustenance of natural circulation in the primary system, steam generators (SGs) and PHRS. The analysis was carried out by using system thermal hydraulic safety code RELAP5/SCDAP/MOD 3.4. It is inferred that the inventory in the first stage accumulators and second stage accumulators compensate the leak and decay heat is removed effectively with the help of passive heat removal systems. It is also observed that even after 7 days of  More>>
Authors:
Gaikwad, A. J.; Rao, R. S.; Lakshmanan, S. P.; Gupta, A., E-mail: avinashg@aerb.gov.in [1] 
  1. Atomic Energy Regulatory Board, Mumbai (India)
Publication Date:
Oct 15, 2014
Product Type:
Conference
Report Number:
IAEA-TECDOC-CD-1749
Resource Relation:
Conference: 5. International Conference on Topical Issues in Nuclear Installation Safety: Defence in Depth - Advances and Challenges for Nuclear Installation Safety, Vienna (Austria), 21-24 Oct 2013; Other Information: 3 refs., 1 tab., 13 figs.; Related Information: In: International Conference on Topical Issues in Nuclear Installation Safety: Defence in Depth — Advances and Challenges for Nuclear Installation Safety. Proceedings of an International Conference held in Vienna, Austria, 21-24 October 2013| 353 p.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; AFTER-HEAT; COOLING; ENERGY BALANCE; FAILURES; LEAKS; NATURAL CONVECTION; OUTAGES; R CODES; REACTOR SAFETY; STEAM GENERATORS; THERMAL HYDRAULICS; WATER; WWER TYPE REACTORS
OSTI ID:
22318542
Research Organizations:
International Atomic Energy Agency, Safety Assessment Section, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISBN 978-92-0-158214-0; ISSN 1684-2073; TRN: XA14M7058024739
Availability:
Available from INIS in electronic form. Also available on-line: http://www-pub.iaea.org/MTCD/publications/PDF/TE-1749_CD_web.pdf and on 1 CD-ROM from IAEA, Marketing and Sales Unit, Publishing Section, E-mail: sales.publications@iaea.org; Web site: http://www.iaea.org/books
Submitting Site:
INIS
Size:
page(s) 279-289
Announcement Date:
Mar 24, 2015

Citation Formats

Gaikwad, A. J., Rao, R. S., Lakshmanan, S. P., and Gupta, A., E-mail: avinashg@aerb.gov.in. Extended Station Blackout Analysis for VVER-1000 MWe Reactor. IAEA: N. p., 2014. Web.
Gaikwad, A. J., Rao, R. S., Lakshmanan, S. P., & Gupta, A., E-mail: avinashg@aerb.gov.in. Extended Station Blackout Analysis for VVER-1000 MWe Reactor. IAEA.
Gaikwad, A. J., Rao, R. S., Lakshmanan, S. P., and Gupta, A., E-mail: avinashg@aerb.gov.in. 2014. "Extended Station Blackout Analysis for VVER-1000 MWe Reactor." IAEA.
@misc{etde_22318542,
title = {Extended Station Blackout Analysis for VVER-1000 MWe Reactor}
author = {Gaikwad, A. J., Rao, R. S., Lakshmanan, S. P., and Gupta, A., E-mail: avinashg@aerb.gov.in}
abstractNote = {Post Fukushima, the plant behaviour for an extended station black-out (ESBO) scenario with only passive system availability for about 7 days has become imperative. Thermal hydraulic analysis of ESBO with the availability of passive heat removal system (PHRS), passive first stage and second stage hydro accumulators were carried out to demonstrate the design capabilities. Two different cases having primary leak rates of 2.2 tons/hr and 6.6 tons/hr were analyzed to study sustenance of natural circulation. For the study, out of 4 PHRS trains, one PHRS train was assumed to be in failure mode. The objective here is to predict the core cooling capability for a period of 7 days under ESBO conditions with the available water inventories from first and second stage hydroaccumulators only. Over simplified energy balance studies cannot ascertain sustenance of natural circulation in the primary system, steam generators (SGs) and PHRS. The analysis was carried out by using system thermal hydraulic safety code RELAP5/SCDAP/MOD 3.4. It is inferred that the inventory in the first stage accumulators and second stage accumulators compensate the leak and decay heat is removed effectively with the help of passive heat removal systems. It is also observed that even after 7 days of ESBO a large inventory is still available in the second stage accumulators and the primary system remains subcooled. (author)}
place = {IAEA}
year = {2014}
month = {Oct}
}