05000461/FIN-2015001-01
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Finding | |
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| Title | Failure to perform adequate channel calibration on seismic instrumentation |
| Description | The inspectors identified a Green Finding associated with the licensees failure to perform a channel calibration with appropriate acceptance criteria to determine the functionality of the stations seismic monitoring equipment used for evaluating earthquakes. Specifically, station procedure CPS 9437.21, Triax Time-History Accelerometer Channel Calibration, Revision 39c, did not include steps with clear acceptance criteria to ensure that battery backup power was provided to operate the equipment on a loss of the normal power source as part of the operability requirements. The licensee documented the issue in the corrective action program (CAP) as action request (AR) 02454630. The licensee performed an operability evaluation and determined that the original voltage read by the technicians was outside the band described in the procedure but was within the band described by the vendor and therefore was operable. The licensee also planned to change the surveillance test procedure to clarify the acceptance criteria. The licensees failure to perform a channel calibration with appropriate acceptance criteria to determine the functionality of the stations seismic monitoring equipment used for evaluating earthquakes was a performance deficiency. Specifically, station procedures did not include steps with clear acceptance criteria to ensure that battery backup power was provided to operate the equipment on a loss of the normal power source. The performance deficiency was more than minor because it adversely impacted the protection against external factors attribute of the Mitigating Systems cornerstone objective to ensure the availability, reliability and capability of systems that respond to initiating events to prevent undesirable consequences. Using IMC 0609, Attachment 4 Initial Characterization of Findings, and Appendix A The Significance Determination Process for Findings at Power, issued June 19, 2012, the inspectors answered Yes to the Mitigating Systems cornerstone question, Does the finding involve the ...degradation of equipment...specifically designed to mitigate a seismic...initiating event.... Therefore, the inspectors addressed the questions in Exhibit 4, External Event Screening Questions. The inspectors answered No to the two questions in Exhibit 4. Specifically, 1) if completely failed the seismic monitor would not cause an initiating event or degrade multi-trains or risk-significant systems; and 2) the finding does not involve the total loss of any safety function. The inspectors determined this finding affected the cross-cutting area of human performance in the aspect of conservative bias where individuals use decision making-practices that emphasize prudent choices over those that are simply allowable and a proposed action is determined to be safe in order to proceed, rather than unsafe in order to stop. Specifically, the licensee documented the issue of the voltage being high out of specification and instead of performing additional corrective actions to determine if leaving the voltage out of specification was appropriate marked the step as not applicable and proceeded with the rest of the procedure. [H.14] |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2015001 Section 1R15 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | C Hunt E Sanchez-Santiago J Gilliam J Mcghee M Jones S Bell S Mischke W Schaup |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Clinton - IR 05000461/2015001 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2015Q1
Self-Identified List (Clinton)
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