05000263/FIN-2012005-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | A finding of very low safety significance (Green) and associated violation of 10 CFR Part 50, Appendix B, Criterion III Design Control was identified by the licensee for the failure to ensure the ECCS mode of operation of RHR would be capable of performing its mitigating function in Mode 3 following RHR realignment from its shutdown cooling mode of operation to the LPCI mode of operation while greater than 212 degrees Fahrenheit. Specifically, the operability requirements of RHR in Mode 3, as defined by TS 3.5.1, were not translated into applicable procedures or specifications of the system in that the procedures nor the design prevented the condition that would lead to steam void formation during a loss of coolant accident (LOCA) that initiates at this mode resulting in steam binding of the systems pumps and/or an adverse water hammer. The performance deficiency was determined to be more than minor because it was associated with the Mitigating System Cornerstone attribute of equipment performance and affected the cornerstone objective of ensuring the capability of systems that respond to initiating events to prevent undesirable consequences. A Phase II SDP was conducted using IMC 0609, Appendix G. The finding screened as very low safety significance. The licensee entered this concern into its CAP as AR 01286645 and initiated a condition evaluation for TS 3.5.1 ECCS Operating may be non-conservative . In the interim, the licensee has implemented procedure changes to address the potential flashing and water hammer concern, until an analysis is made available that supports LPCI operability in this scenario or until other corrective actions are taken. The licensee plans to evaluate the BWR Owners Group analysis of the postulated Mode 3 LOCA scenario and implement permanent procedural, design and/or licensing basis changes as necessary. |
| Site: | Monticello  |
|---|---|
| Report | IR 05000263/2012005 Section 4OA7 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | P Voss M Learn D Mcneil K Riemer M Phalen S Thomas J Laughlin J Bozga M Jones |
| INPO aspect | |
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Finding - Monticello - IR 05000263/2012005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Monticello) @ 2012Q4
Self-Identified List (Monticello)
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