05000315/FIN-2017002-06
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Finding | |
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| Title | Single Point Failure Vulnerability in Annunciator System |
| Description | Green . A self -revealed finding occurred on March 30, 2017, when operation of a work station for the control room annunciators caused a loss of all annunciators in the Unit 1 control room. Specifically, a software error coupled with an overflowing cache caused a single point fai lure of the Unit 1 annunciator. When in us e by a control room operator, Server 1 for the annunciator system failed and transferred functions to Server 2 . Server 2 also failed causing a loss of all annunciators for the Unit 1 control room. The licensee restored the system a few hours later and entered the condition into the corrective action program. The inspectors determined that the failure to design the system to preclude loss of a single active component from causing a loss of the annunciator system was a performance deficiency that warranted a significance determination. Using IMC 0612, the inspectors determined the finding was more than minor because it adversely impacted the mitigating system cornerstone objective to ensure the availability of systems that respond to initiating event. Using IMCC 0609, the inspectors determined that support of the Senior Risk Analyst (SRA) was needed because the condition resulted in the loss of a function, the annunciators. The S RA performed a simple detailed analysis and concluded the finding was of very low safety significance. The inspectors did not identify a cross -cutting aspect associated with this finding because it was not reflective of current performance. |
| Site: | Cook  |
|---|---|
| Report | IR 05000315/2017002 Section 4OA3 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | J Ellegood T Taylor T Go V Petrella L Rodriguez B Dickson |
| INPO aspect | |
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Finding - Cook - IR 05000315/2017002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2017Q2
Self-Identified List (Cook)
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