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During a review of the impact of electrica … During a review of the impact of electrical faults on the systems required to safely shutdown the facility in the event of a control room fire, it was determined that an existing inverter design is incompatible with the center tap design of the ungrounded DC electrical system. Specifically, a postulated fire that results in an electrical short of the Unit 2 Division 2 125/250 VDC distribution system to ground can potentially result in the loss of automatic or manual control of the Reactor Core Isolation Cooling (RCIC) turbine at the Remote Shutdown Panel (RSDP). The current fire safe shutdown analysis credits the RCIC system for post-fire inventory control during a worst-case main control room fire. The postulated loss of the RSDP RCIC control capability is considered an unanalyzed condition.</br></br>The cause of the condition is attributed to the failure to recognize and incorporate critical design characteristics into the design specification. The affected inverter has been modified to eliminate the potential for inverter failure as a result of hard grounds on the 125/250 VDC distribution system. Other installed inverters with susceptible surge suppression will be modified in accordance with the work management process. Additional corrective actions include training and communication of the issue with appropriate individuals and applicable procedure and process enhancements. The actual and potential safety significance of this condition is considered minimal.e of this condition is considered minimal. +
During a review of the impact of electrica … During a review of the impact of electrical faults on the systems required to safely shutdown the facility in the event of a control room fire, it was determined that an existing inverter design is incompatible with the center tap design of the ungrounded DC electrical system. Specifically, a postulated fire that results in an electrical short of the Unit 2 Division 2 125/250 VDC distribution system to ground can potentially result in the loss of automatic or manual control of the Reactor Core Isolation Cooling (RCIC) turbine at the Remote Shutdown Panel (RSDP). The current fire safe shutdown analysis credits the RCIC system for post-fire inventory control during a worst-case main control room fire. The postulated loss of the RSDP RCIC control capability is considered an unanalyzed condition.</br></br>The cause of the condition is attributed to the failure to recognize and incorporate critical design characteristics into the design specification. The affected inverter has been modified to eliminate the potential for inverter failure as a result of hard grounds on the 125/250 VDC distribution system. Other installed inverters with susceptible surge suppression will be modified in accordance with the work management process. Additional corrective actions include training and communication of the issue with appropriate individuals and applicable procedure and process enhancements. The actual and potential safety significance of this condition is considered minimal.e of this condition is considered minimal. +
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