Equipment and procedural modifications to improve the reliability of Terry turbines used in nuclear service

Conference · Wed Jan 01 04:00:00 EST 1986 · Trans. Am. Nucl. Soc.; (United States)

OSTI ID:6820315

McNeill, H

Terry turbines are used to drive auxiliary feedwater and emergency cooling water pumps for pressurized water (PWR) and boiling water reactor (BWR) nuclear power plants. The record indicates that of all nuclear plants in service or under construction, approx.95% of the installations using turbo pump systems have called for Terry solid wheel turbines. A case study has been completed by the US Nuclear Regulatory Commission (NRC) to review past operating experience involving overspeed trips of PWR auxiliary feedwater (AFW) turbine-driven pumps, and BWR high-pressure coolant injection (HPCI) and reactor core isolation cooling (RCIC) turbine-driven pumps. As this study pointed out, that although the reliability of PWR AFW systems was of primary concern, the operational problems of AFW, HPCI, and RCIC systems were quite similar. Similarly, this paper is concerned with the PWR AFW systems with extension possible to BWR HPCI and RCIC systems. Data are presented to show how modifications can be made to the AFW turbine system to improve reliability and address the deficiencies resulting from spurious overspeed trip, water induction, and delayed restart of PG governor systems. The effect of water induction has been evaluated and data are presented from tests conducted at Terry. Procedural improvements are discussed briefly.

• OSTI ID: 6820315
• Report Number(s): CONF-861102-
• Conference Information: Journal Name: Trans. Am. Nucl. Soc.; (United States) Journal Volume: 53
• Country of Publication: United States
• Language: English

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