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Fort St. Vrain circulator operating experience

Abstract

Fort St. Vrain, on the system of Public Service Company of Colorado, is the only high-temperature gas-cooled power reactor in the United States. Four helium circulators are utilized in this plant to transfer heat from the reactor to the steam generators. These unique machines have a single stage axial flow helium compressor driven by a single stage steam turbine. A single stage water driven (pelton wheel) turbine is the back-up drive utilizing either feed water, condensate, or fire water as the driving fluid. Developmental testing of the circulators was accomplished prior to installation into Fort St. Vrain. A combined machine operating history of approximately 250,000 hours has shown these machines to be of conservative design and proven mechanical integrity. However, many problems have been encountered in operating the complex auxiliaries which are necessary for successful circulator and plant operation. It has been 15 years since initial installation of the circulators occurred at Fort St. Vrain. During this time, a number of significant issues had to be resolved dealing specifically with machine performance. These events include cavitation damage of the pelton wheels during the initial plant hot functional testing, cracks in the water turbine buckets and cervic coupling, static shutdown seal  More>>
Authors:
Publication Date:
Aug 15, 1988
Product Type:
Conference
Report Number:
IWGGCR-17; CONF-8711106-
Reference Number:
AIX-20-016544; EDB-89-031697
Resource Relation:
Conference: Meeting on gas-cooled reactor coolant circulator and blower technology, San Diego, CA, USA, 30 Nov - 2 Dec 1987; Related Information: In: Gas-cooled reactor coolant circulator and blower technology. Proceedings of a specialists meeting held in San Diego 30 November - 2 December 1987.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; VRAIN REACTOR; BLOWERS; FAILURES; MAINTENANCE; OPERATION; PERFORMANCE TESTING; REPAIR; SPECIFICATIONS; ENRICHED URANIUM REACTORS; GAS COOLED REACTORS; GRAPHITE MODERATED REACTORS; HELIUM COOLED REACTORS; HTGR TYPE REACTORS; POWER REACTORS; REACTORS; TESTING; 210300* - Power Reactors, Nonbreeding, Graphite Moderated
OSTI ID:
7955681
Research Organizations:
Public Service Co. of Colorado, Denver (USA)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE88705385
Submitting Site:
INIS
Size:
Pages: 31-38
Announcement Date:
Mar 15, 2013

Citation Formats

Brey, H. L. Fort St. Vrain circulator operating experience. IAEA: N. p., 1988. Web.
Brey, H. L. Fort St. Vrain circulator operating experience. IAEA.
Brey, H. L. 1988. "Fort St. Vrain circulator operating experience." IAEA.
@misc{etde_7955681,
title = {Fort St. Vrain circulator operating experience}
author = {Brey, H. L.}
abstractNote = {Fort St. Vrain, on the system of Public Service Company of Colorado, is the only high-temperature gas-cooled power reactor in the United States. Four helium circulators are utilized in this plant to transfer heat from the reactor to the steam generators. These unique machines have a single stage axial flow helium compressor driven by a single stage steam turbine. A single stage water driven (pelton wheel) turbine is the back-up drive utilizing either feed water, condensate, or fire water as the driving fluid. Developmental testing of the circulators was accomplished prior to installation into Fort St. Vrain. A combined machine operating history of approximately 250,000 hours has shown these machines to be of conservative design and proven mechanical integrity. However, many problems have been encountered in operating the complex auxiliaries which are necessary for successful circulator and plant operation. It has been 15 years since initial installation of the circulators occurred at Fort St. Vrain. During this time, a number of significant issues had to be resolved dealing specifically with machine performance. These events include cavitation damage of the pelton wheels during the initial plant hot functional testing, cracks in the water turbine buckets and cervic coupling, static shutdown seal bellows failure, and, most recently, degradation of components within the steam drive assembly. Unreliable operation particularly with the circulator auxiliaries has been a focus of attention by Public Service Company of Colorado. Actions to replace or significantly modify the existing circulators and their auxiliaries are currently awaiting decisions concerning the long-term future of the Fort St. Vrain plant. (author). 10 refs, 7 figs, 2 tabs.}
place = {IAEA}
year = {1988}
month = {Aug}
}