You need JavaScript to view this

Control of water chemistry in operating reactors

Abstract

Water chemistry plays a major role in fuel cladding corrosion and hydriding. Although a full understanding of all mechanisms involved in cladding corrosion does not exist, controlling the water chemistry has achieved quite some progress in recent years. As an example, in PWRs the activity transport is controlled by operating the coolant under higher pH-values (i.e. the ``modified`` B/Li-Chemistry). On the other hand, the lithium concentration is limited to a maximum value of 2 ppm in order to avoid an acceleration of the fuel cladding corrosion. In BWR plants, for example, the industry has learned on how to limit the copper concentration in the feedwater in order to limit CILC (Copper Induced Localized Corrosion) on the fuel cladding. However, economic pressures are leading to more rigorous operating conditions in power reactors. Fuel burnups are to be increased, higher efficiencies are to be achieved, by running at higher temperatures, plant lifetimes are to be extended. In summary, this paper will describe the state of the art in controlling water chemistry in operating reactors and it will give an outlook on potential problems that will arise when going to more severe operating conditions. (author). 3 figs, 6 tabs.
Authors:
Riess, R [1] 
  1. Siemens AG Unternehmensbereich KWU, Erlangen (Germany)
Publication Date:
Feb 01, 1997
Product Type:
Conference
Report Number:
IAEA-TECDOC-927; CONF-9310467-
Reference Number:
SCA: 210200; PA: AIX-28:034574; EDB-97:060676; SN: 97001775150
Resource Relation:
Conference: Technical committee meeting on influence of water chemistry on fuel cladding behaviour, Rez (Czech Republic), 4-8 Oct 1993; Other Information: PBD: Feb 1997; Related Information: Is Part Of Influence of water chemistry on fuel cladding behaviour. Proceedings of a technical committee meeting; PB: 499 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; WATER CHEMISTRY; CONTROL; REACTOR MONITORING SYSTEMS; BURNUP; CORROSION; FUEL CANS; PWR TYPE REACTORS; REACTOR OPERATION
OSTI ID:
462444
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1011-4289; Other: ON: DE97622401; TRN: XA9743704034574
Availability:
INIS; OSTI as DE97622401
Submitting Site:
INIS
Size:
pp. 407-420
Announcement Date:

Citation Formats

Riess, R. Control of water chemistry in operating reactors. IAEA: N. p., 1997. Web.
Riess, R. Control of water chemistry in operating reactors. IAEA.
Riess, R. 1997. "Control of water chemistry in operating reactors." IAEA.
@misc{etde_462444,
title = {Control of water chemistry in operating reactors}
author = {Riess, R}
abstractNote = {Water chemistry plays a major role in fuel cladding corrosion and hydriding. Although a full understanding of all mechanisms involved in cladding corrosion does not exist, controlling the water chemistry has achieved quite some progress in recent years. As an example, in PWRs the activity transport is controlled by operating the coolant under higher pH-values (i.e. the ``modified`` B/Li-Chemistry). On the other hand, the lithium concentration is limited to a maximum value of 2 ppm in order to avoid an acceleration of the fuel cladding corrosion. In BWR plants, for example, the industry has learned on how to limit the copper concentration in the feedwater in order to limit CILC (Copper Induced Localized Corrosion) on the fuel cladding. However, economic pressures are leading to more rigorous operating conditions in power reactors. Fuel burnups are to be increased, higher efficiencies are to be achieved, by running at higher temperatures, plant lifetimes are to be extended. In summary, this paper will describe the state of the art in controlling water chemistry in operating reactors and it will give an outlook on potential problems that will arise when going to more severe operating conditions. (author). 3 figs, 6 tabs.}
place = {IAEA}
year = {1997}
month = {Feb}
}