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Cobalt reduction of NSSS valve hardfacings for ALARA

Abstract

This report informs NSSS designer that replacement of materials is one of the major means of ALARA implementation, and describes that NSSS valves with high-cobalt hardfacing are significant contributors to post-shutdown radiation fields caused by activation of cobalt-59 to cobalt-60. Generic procedures for implementing cobalt reduction programs for valves are presented. Discussions are presented of the general and specific design requirements for valve hardfacing in nuclear service. The nuclear safety issues involved with changing valve hardfacing materials are discussed. The common methods used to deposit hardfacing materials are described together with an explanation of the wear measurements. Wear resistance, corrosion resistance, friction coefficient, and mechanical properties of candidate hardfacing alloys are given. World-wide nuclear utility experience with cobalt-free hardfacing alloys is described. The use of low-cobalt or cobalt-free alloys in other nuclear plant components is described. 17 figs., 38 tabs., 18 refs. (Author).
Authors:
Kim, Joo Hak; Lee, Sang Sub [1] 
  1. Korea Atomic Energy Research Institute, Taejon (Korea, Republic of)
Publication Date:
Jul 01, 1994
Product Type:
Technical Report
Report Number:
KAERI-AR-404/94
Reference Number:
SCA: 220200; PA: AIX-27:015073; EDB-96:035844; NTS-96:014555; SN: 96001546121
Resource Relation:
Other Information: PBD: Jul 1994
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; ALARA; STEAM LINES; VALVES; COBALT 60; COBALT 59; MECHANICAL PROPERTIES; STELLITE
OSTI ID:
186444
Research Organizations:
Korea Atomic Energy Research Inst., Daeduk (Korea, Republic of)
Country of Origin:
Korea, Republic of
Language:
Korean
Other Identifying Numbers:
Other: ON: DE96614573; TRN: KR9500209015073
Availability:
INIS; OSTI as DE96614573
Submitting Site:
KRN
Size:
110 p.
Announcement Date:

Citation Formats

Kim, Joo Hak, and Lee, Sang Sub. Cobalt reduction of NSSS valve hardfacings for ALARA. Korea, Republic of: N. p., 1994. Web.
Kim, Joo Hak, & Lee, Sang Sub. Cobalt reduction of NSSS valve hardfacings for ALARA. Korea, Republic of.
Kim, Joo Hak, and Lee, Sang Sub. 1994. "Cobalt reduction of NSSS valve hardfacings for ALARA." Korea, Republic of.
@misc{etde_186444,
title = {Cobalt reduction of NSSS valve hardfacings for ALARA}
author = {Kim, Joo Hak, and Lee, Sang Sub}
abstractNote = {This report informs NSSS designer that replacement of materials is one of the major means of ALARA implementation, and describes that NSSS valves with high-cobalt hardfacing are significant contributors to post-shutdown radiation fields caused by activation of cobalt-59 to cobalt-60. Generic procedures for implementing cobalt reduction programs for valves are presented. Discussions are presented of the general and specific design requirements for valve hardfacing in nuclear service. The nuclear safety issues involved with changing valve hardfacing materials are discussed. The common methods used to deposit hardfacing materials are described together with an explanation of the wear measurements. Wear resistance, corrosion resistance, friction coefficient, and mechanical properties of candidate hardfacing alloys are given. World-wide nuclear utility experience with cobalt-free hardfacing alloys is described. The use of low-cobalt or cobalt-free alloys in other nuclear plant components is described. 17 figs., 38 tabs., 18 refs. (Author).}
place = {Korea, Republic of}
year = {1994}
month = {Jul}
}