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This paper introduces a design modification developed to convert the close-coupled RHR and LPSI pumps to a coupled configurationĭesign of Electrical System for Inhibitor Injection Pump’s Motor PAQ 01/02/03 RSG-GAS The closed-coupled pump design requires disassembly of the casing cover from the lower pump casing while performing these routine maintenance tasks. Periodic mechanical seal of motor bearing replacement often is considered routine maintenance. Traditionally RHR and LPSI pumps have been a significant maintenance item for many utilities. Typically the pump impeller is mounted on an extended motor shaft (close-coupled configuration) and a mechanical seal is employed at the pump end of the shaft. Because these pumps are subjected to rather severe temperature and pressure transients, the majority of pumps installed in the RHR service are vertical pumps with a single stage impeller. Residual Heat Removal (RHR) and low pressure safety injection (LPSI) pumps installed in pressurized water-to-reactor power plants are used to provide low-head safety injection in the event of loss of coolant in the reactor coolant system. Residual heat removal pump and low pressure safety injection pump retrofit program The vibration phenomena illustrate the importance of carrying out test in the plants under conditions as close as possible to those of actual accident. This constitutes a potential common mode of failure of the safety injection system and the containment spray system pumps.
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This fault was not revealed either during the low pressure safety injection and containment spray system pump qualification test under accident conditions or during the special tests on a test bench carried out to attempt to replicate the fault and to identify ways of remedying it. This paper covers a fault encountered in the safety injection pump motors of the French 900 MWe unit nuclear power stations. The vibration phenomena illustrate the importance of carrying out tests in the plants under conditions as close as possible to those of actual accident situations This fault was not revealed either during the low pressure safety injection and containment spray system pump qualification tests under accident conditions or during the special tests on a test bench carried out to attempt to replicate the fault and to identify ways of remedying it. International Nuclear Information System (INIS) The vibration phenomena illustrate the importance of carrying out tests in the plants under conditions as close as possible to those of actual accident situations. Vibration of safety injection pump motorsĮnergy Technology Data Exchange (ETDEWEB)