05000454/FIN-2011002-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | A finding of very low safety significance (Green) and associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified by the licensee for the failure to ensure that the ECCS mode of operation of residual heat removal would be capable of performing its mitigating function in Mode 4 following residual heat removal system realignment from its decay heat removal mode of operation. Specifically, the operability requirements of RH in Mode 4 defined by TS 3.5.3 were not translated into applicable procedures or specifications of the system in that neither the procedures nor design prevented the conditions that would lead to steam void formation during a LOCA that initiates at this Mode resulting in steam binding of the system pumps and/or an adverse water-hammer. The performance deficiency was determined to be more than minor because it was associated with the Mitigating Systems cornerstone attribute of Equipment Performance and adversely affected the cornerstone objective of ensuring the capability of systems that respond to initiating events to prevent undesirable consequences. An SDP Phase II evaluation concluded that the finding screened as having very low safety significance. The licensee entered this concern in their corrective action program as IR 1147124 and, as an interim measure, implemented a standing order for the residual heat removal system to establish controls to ensure that at least one residual heat removal train would be protected in its ECCS mode of operation in Mode 4. In addition, at the time of this inspection, the licensee planned to implement permanent procedural changes to ensure the operability of at least one residual heat removal train while in Mode 4. |
| Site: | Byron  |
|---|---|
| Report | IR 05000454/2011002 Section 4OA7 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Ng C Thompson B Bartlett J Robbins J Cassidy M Jones E Duncan J Gilliam W Lyon C Tilton J Miller J Whitman |
| INPO aspect | |
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Finding - Byron - IR 05000454/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2011Q1
Self-Identified List (Byron)
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