05000317/FIN-2014002-03
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Finding | |
|---|---|
| Title | Inadvertent Loss of RCS Inventory During Lowered Inventory Conditions |
| Description | The inspectors identified a self-revealing NCV of Technical Specification (TS) 5.4.1, Procedures, for the failure of Constellation Energy Nuclear Group, LLC (CENG) personnel to adequately implement procedures associated with a local leak rate test (LLRT). Specifically, CENG personnel did not isolate the letdown line in accordance with surveillance test procedure (STP)-O-108D-1, Containment Penetration Local Leak Rate Tests, prior to draining the piping in preparation for an LLRT on chemical and volume control system (CVCS) containment isolation valves. This resulted in inadvertently draining 150 gallons from the reactor coolant system (RCS) while the reactor vessel was in a lowered inventory condition. Immediate corrective actions included entering this issue into their corrective action program (CAP), performing a prompt investigation, and conducting a safety stand-down. In addition, an apparent cause evaluation will be performed to determine any additional corrective actions. The finding is more than minor because it is associated with the configuration control attribute of the Initiating Events cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the failure to isolate the letdown line prior to draining resulted in he loss of 150 gallons of RCS inventory and challenged the critical safety function of inventory control while in a lowered inventory condition. Operator actions were required to identify and isolate the leak to prevent further inventory loss. The inspectors evaluated this finding using IMC 0609.04, Initial Characterization of Findings, issued June 19, 2012, and IMC 0609, Appendix G, Shutdown Operations Significance Determination Process, issued February 28, 2005, and determined that the issue screened to Green (very low safety significance). Specifically, the inspectors determined that adequate mitigating capability remained available and the finding did not represent a loss of control of RCS level due to less than 2 feet of inventory loss when not in midloop. As a result, a Phase 2 quantitative assessment was not required and the issue screened to Green. The inspectors determined that the finding has a cross-cutting aspect in the area of Human Performance, Teamwork, because CENG individuals and work groups did not adequately communicate and coordinate their activities within and across organizational boundaries to ensure nuclear safety was maintained. Specifically, a detailed shift turnover between dayshift and nightshift LLRT operators was not completed to ensure that the oncoming operators were aware of the letdown system configuration [H.4]. |
| Site: | Calvert Cliffs  |
|---|---|
| Report | IR 05000317/2014002 Section 1R20 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | N Floyd P Kaufman S Kennedy T Burns A Bolger A Rosebrook D Schroeder E Torres H. Anagnostopoulus |
| Violation of: | Technical Specification - Procedures Technical Specification |
| CCA | H.4, Teamwork |
| INPO aspect | PA.3 |
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Finding - Calvert Cliffs - IR 05000317/2014002 | ||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2014Q1
Self-Identified List (Calvert Cliffs)
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