05000397/FIN-2008005-02
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Finding | |
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| Title | Failure to translate design basis into procedures for residual heat removal operating modes |
| Description | The inspectors identified a noncited violation of 10 CFR 50, Appendix B, Criterion III (Design Control) for the failure to properly translate the design basis of the facility into procedures. Specifically, when the residual heat removal system, Trains A, B or C, were used in the suppression pool cooling or mixing modes of operation, the trains were vulnerable to water hammer events that could challenge train operability during a loss of coolant accident coincident with a loss of offsite power. The licensee entered the condition into their corrective action program as Condition Report 182958. The finding was more than minor because, if left uncorrected, it would lead to a more significant safety concern. Specifically, the licensee could use multiple trains of residual heat removal in the suppression pool cooling and mixing modes of operations, which could make them incapable of performing their safety functions during a loss of coolant accident coincident with a loss of offsite power. Using the Manual Chapter 0609, Significance Determination Process, Phase 1 screening worksheet, the issue screened as having very low safety significance (Green) because the finding: 1) was a design or qualification deficiency that could result in loss of operability or functionality; 2) did not involve an actual loss of system safety function; 3) did not result in a loss of a single train for greater than the technical specification allowed outage time; 4) did not result in a loss of safety function of one or risk significant trains of equipment for more than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; and 5) did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding did not have a crosscutting aspect because the concern involved an older design issu |
| Site: | Columbia  |
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| Report | IR 05000397/2008005 Section 4OA5 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Henderson R Cohen T Mckernon L Carson G Replogle W Sifre M Hayes M Bloodgood T Pate |
| INPO aspect | |
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Finding - Columbia - IR 05000397/2008005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2008Q4
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