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A study on thimble plug removal for PWR plants

Abstract

The thermal-hydraulic effects of removing the RCC guide thimble plugs are evaluated for 8 Westinghouse type PWR plants in Korea as a part of feasibility study: core outlet loss coefficient, thimble bypass flow, and best estimate flow. It is resulted that the best estimate thimble bypass flow increases about by 2% and the best estimate flow increases approximately by 1.2%. The resulting DNBR penalties can be covered with the current DNBR margin. Accident analyses are also investigated that the dropped rod transient is shown to be limiting and relatively sensitive to bypass flow variation. 8 refs., 5 tabs. (Author)
Authors:
Song, Dong Soo; Lee, Chang Sup; Lee, Jae Yong; Jun, Hwang Yong [1] 
  1. Korea Electric Power Research Institute, Taejon (Korea, Republic of)
Publication Date:
Dec 31, 1997
Product Type:
Conference
Report Number:
ETDE/KR-99732628; CONF-9710296-
Reference Number:
SCA: 210200; 220504; PA: KR-99:000319; EDB-99:035054; SN: 99002059946
Resource Relation:
Conference: Korean Nuclear Society autumn meeting, Taegu (Korea, Republic of), 24-25 Oct 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the korean nuclear society autumn meeting vol I, October 24-25, 1997 Taegu, Korea; PB: 797 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; 22 NUCLEAR REACTOR TECHNOLOGY; PWR TYPE REACTORS; CLOSURES; REMOVAL; FEASIBILITY STUDIES; BYPASSES; REACTOR COOLING SYSTEMS; DEPARTURE NUCLEATE BOILING; TRANSIENTS; ROD DROP ACCIDENTS; HYPOTHESIS
OSTI ID:
324164
Research Organizations:
Korean Nuclear Society, Taejon (Korea, Republic of)
Country of Origin:
Korea, Republic of
Language:
English
Other Identifying Numbers:
Other: ON: DE99732628; TRN: KR9900319
Availability:
OSTI as DE99732628
Submitting Site:
KR
Size:
pp. 611-616
Announcement Date:

Citation Formats

Song, Dong Soo, Lee, Chang Sup, Lee, Jae Yong, and Jun, Hwang Yong. A study on thimble plug removal for PWR plants. Korea, Republic of: N. p., 1997. Web.
Song, Dong Soo, Lee, Chang Sup, Lee, Jae Yong, & Jun, Hwang Yong. A study on thimble plug removal for PWR plants. Korea, Republic of.
Song, Dong Soo, Lee, Chang Sup, Lee, Jae Yong, and Jun, Hwang Yong. 1997. "A study on thimble plug removal for PWR plants." Korea, Republic of.
@misc{etde_324164,
title = {A study on thimble plug removal for PWR plants}
author = {Song, Dong Soo, Lee, Chang Sup, Lee, Jae Yong, and Jun, Hwang Yong}
abstractNote = {The thermal-hydraulic effects of removing the RCC guide thimble plugs are evaluated for 8 Westinghouse type PWR plants in Korea as a part of feasibility study: core outlet loss coefficient, thimble bypass flow, and best estimate flow. It is resulted that the best estimate thimble bypass flow increases about by 2% and the best estimate flow increases approximately by 1.2%. The resulting DNBR penalties can be covered with the current DNBR margin. Accident analyses are also investigated that the dropped rod transient is shown to be limiting and relatively sensitive to bypass flow variation. 8 refs., 5 tabs. (Author)}
place = {Korea, Republic of}
year = {1997}
month = {Dec}
}