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At 2351, on September 24, 2001 a manual re … At 2351, on September 24, 2001 a manual reactor trip was initiated in accordance with operating procedures due to the loss of condenser vacuum. At approximately 2243 hours on September 24, 2001 the number 2 Station Power Transformer (XFMR) (SPT) in the Salem Switchyard experienced an electrical fault on one of its associated surge arresters (LAR). The electrical transient initiated by the fault resulted in the loss of the # 2 station power transformer, and for Salem Unit 1, in the loss of three of the six condenser circulating (NN) water pumps (PMP), the loss of its circulating water traveling screens (SCN), as well as the sensing instrumentation for the differential pressure across the traveling screens. With only three of six circulating water pumps operating per unit, both Salem units reduced electrical load to maintain main condenser vacuum. Following the restoration of electrical power to the circulating water bus, one of the remaining Salem 1 circulating water pumps licensed control room operators manually tripped the reactor per the guidance of the abnormal operating procedure. The loss of the SPT is attributed to a failed arrester. Some of the corrective actions taken were: (1) The failed arrester was replaced, and (2) Similar arresters in other transformers were also replaced. This condition is being reported in accordance with the requirements of 10CFR50.73(a)(2)(iv). the requirements of 10CFR50.73(a)(2)(iv). +
At 2351, on September 24, 2001 a manual re … At 2351, on September 24, 2001 a manual reactor trip was initiated in accordance with operating procedures due to the loss of condenser vacuum. At approximately 2243 hours on September 24, 2001 the number 2 Station Power Transformer (XFMR) (SPT) in the Salem Switchyard experienced an electrical fault on one of its associated surge arresters (LAR). The electrical transient initiated by the fault resulted in the loss of the # 2 station power transformer, and for Salem Unit 1, in the loss of three of the six condenser circulating (NN) water pumps (PMP), the loss of its circulating water traveling screens (SCN), as well as the sensing instrumentation for the differential pressure across the traveling screens. With only three of six circulating water pumps operating per unit, both Salem units reduced electrical load to maintain main condenser vacuum. Following the restoration of electrical power to the circulating water bus, one of the remaining Salem 1 circulating water pumps licensed control room operators manually tripped the reactor per the guidance of the abnormal operating procedure. The loss of the SPT is attributed to a failed arrester. Some of the corrective actions taken were: (1) The failed arrester was replaced, and (2) Similar arresters in other transformers were also replaced. This condition is being reported in accordance with the requirements of 10CFR50.73(a)(2)(iv). the requirements of 10CFR50.73(a)(2)(iv). +
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