05000456/FIN-2014002-01
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Finding | |
|---|---|
| Title | Inadequate AOP Entry Criteria for Intake Frazil Icing Conditions |
| Description | The inspectors identified a finding of very low safety significance and an associated NCV of Technical Specification (TS) 5.4.1, Procedures, when licensee personnel failed to specify adequate entry conditions in Abnormal Operating Procedure (AOP) 0BwOA ENV-1, Adverse Weather Conditions, utilized to monitor and mitigate a frazil ice event at the lake screen house (LSH). Specifically, the licensee had established a frazil ice entry condition without adequately considering the plant data available to control room operators and without accounting for instrument accuracy and uncertainty. The licensee entered this issue into their Corrective Action Program (CAP) as Issue Report (IR) 1613056, NRC Identified Ice Forming at the LSH CW [Circulating Water] Trash Bars, and IR 1617385, NRC Questions Regarding Frazil Ice. Corrective actions included revising the frazil ice entry conditions based upon essential service water temperature with margin to account for instrument uncertainty and essential service water heat input. The inspectors determined that the performance deficiency was more than minor, because it was associated with the Procedure Quality attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the failure to establish and maintain adequate entry conditions into 0BwOA ENV-1 could result in additional time for ice to accumulate on plant components before mitigating actions would be initiated. Any delay in mitigating this type of event could increase the likelihood of a loss or partial loss of essential service water event or other transient. A detailed risk evaluation was performed by an NRC Regional Senior Risk Analyst (SRA) and the finding was determined to be of very low safety significance (Green). This finding did not have an associated cross-cutting aspect because the inspectors determined that the most significant error occurred when the entry criteria was established in November 2010, and therefore was not indicative of current performance. |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2014002 Section 1R01 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.01 |
| Inspectors (proximate) | A Garmoe E Duncan F Ramirez J Benjamin J Coroju Sandin M Perry T Go |
| Violation of: | Technical Specification - Procedures Technical Specification |
| INPO aspect | |
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Finding - Braidwood - IR 05000456/2014002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2014Q1
Self-Identified List (Braidwood)
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