ENS 43870
ENS Event | |
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02:04 Dec 28, 2007 | |
Title | Loss of Spds Capability for Greater than One Hour |
Event Description | At 2004, while performing a routine surveillance (Manual Scram Functional Test) the operator performing the surveillance identified that the Plant Management Information System (PMIS) terminals in the control room did not respond as expected to the surveillance. The expected response would have displayed an 'RPS channel trip' message.
PMIS is the computer system which implements the Safety Parameter Display System [SPDS] and dose determination. Dose determination was available using manual calculations. This system also supports the ERDS (Emergency Response Data System) and the core monitoring system. Additional investigation found that the PMIS displays had stopped updating at 1950. Attempts to cause the system to fail over to the backup computer (the 'A' computer) thus restoring functionality were unsuccessful. Information Technology (IT) personnel were called and responded to the plant. IT personnel manually restarted the 'A' computer and switched the input/output (I/O) devices to the 'A' computer. Personnel have verified the Technical Support Center and Emergency Offsite Facility systems are also functional. Functionality of the SPDS system and its related systems was verified to be restored at 2330. The backup system ('B') remains out of service and will be addressed tomorrow. This event is reported under 50.72(b)(3)xiii, Any event which results in a major loss of emergency assessment capability. The licensee notified the NRC Resident Inspector. |
Where | |
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Cooper ![]() Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
Time - Person (Reporting Time:+0.33 h0.0138 days <br />0.00196 weeks <br />4.52034e-4 months <br />) | |
Opened: | Robert Alexander 02:24 Dec 28, 2007 |
NRC Officer: | John Knoke |
Last Updated: | Dec 28, 2007 |
43870 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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