ENS 46820
ENS Event | |
|---|---|
20:13 May 4, 2011 | |
| Title | Changes in Fuel Vendor Calculation Methodology to Comply with the Eccs Performance Requirements of 10 Cfr 50.46(B). |
| Event Description | Oyster Creek has been informed of a change in its vendor's calculation of Peak Cladding Temperature (PCT) and the Maximum Local Oxidation (MLO) that is based on corrections to errors in the previous calculation of record the vendor has identified. Based on 10 CFR 50.46 Appendix K inputs and assumptions, the correction of errors resulted in an increase of 115 degrees F in the PCT for GE11 fuel and 145 degrees F for the GNF2 fuel. The impact on the MLO due to these errors resulted in an increase of 16.0% for GE11 fuel and 33.0% for the GNF2 fuel.
To ensure compliance with the 10 CFR 50.46 requirements, administrative Maximum Average Planar Linear Heat Generation Rate (MAPLHGR) limit adjustments have been applied to bring the PCT and MLO limits below the 10 CFR 50.46 criteria of 2200 degrees F and 17% acceptance criteria. The current LOCA analysis of record remains applicable with the applied MAPLHGR limit adjustments. This notification is being made as a result of the 10 CFR 50.46(a)(3)(ii) requirement to report this issue in accordance with 10 CFR50.72 and 10 CFR50.73. Based on current core thermal power level and existing margin to limits on power operation there is sufficient margin for analyzed accident scenarios requiring ECCS operation including appropriate MAPLHGR compensation to restore the PCT and the MLO within 10 CFR 50.46 acceptance criteria and therefore there is no impact on safe operation. As a result of the MAPLHGR limit adjustment the current LOCA analysis of record remains applicable and therefore, the offsite dose is still bounded by our current safety analysis. Therefore this event is not significant with respect to the health and safety of the public. Corrective Action(s): (1) Administrative adjustments to allowable MAPLHGR limits have been imposed to restore the applicability of the current LOCA analysis of record. (2) Revised MAPLHGR limits have been provided by the fuel vendor and will be implemented into the plant monitoring system, followed by removal of the administrative adjustments to the MAPLGHR. (3) A 10 CFR 50.46 report will be submitted within 30-days. The licensee will notify the NRC Resident Inspector. |
| Where | |
|---|---|
| Oyster Creek New Jersey (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-2.27 h-0.0946 days <br />-0.0135 weeks <br />-0.00311 months <br />) | |
| Opened: | John Clark 17:57 May 4, 2011 |
| NRC Officer: | Pete Snyder |
| Last Updated: | May 4, 2011 |
| 46820 - NRC Website
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Oyster Creek with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
WEEKMONTHYEARENS 468202011-05-04T20:13:0004 May 2011 20:13:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Changes in Fuel Vendor Calculation Methodology to Comply with the Eccs Performance Requirements of 10 Cfr 50.46(B). 2011-05-04T20:13:00 | |