PNP 2013-050, Confirmatory Action Letter - Revision of Commitments to Address Safety Injection Refueling Water Tank and Control Room Concrete Support Structure Leakage
| ML13171A219 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/20/2013 |
| From: | Vitale A Entergy Nuclear Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| PNP 2013-050, EA-12-155 | |
| Download: ML13171A219 (4) | |
Text
Entergy Entergy Nuclear Operations, Inc.
Palisades Nuclear Plant 27780 Blue Star Memorial Highway Covert, MI 49043 269.764.2000 Anthony J. Vitale Site Vice President PNP 2013-050 June 20,2013 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Subject:
Confirmatory Action Letter - Palisades Nuclear Plant Revision of Commitments to Address Safety Injection Refueling Water Tank and Control Room Concrete Support Structure Leakage Palisades Nuclear Plant Docket 50-255 License No. DPR-20
References:
- 1.
Entergy letter to NRC (PNP 2012-064), Safety Injection Refueling Water Tank Leakage and Corrective Actions, dated July 12, 2012 (ADAMS Accession No. ML12194A573)
- 2.
Dear Sir or Madam:
NRC Order EA-12-155, Confirmatory Action Letter - Palisades Nuclear Plant Commitments to Address Safety Injection Refueling Water Tank and Control Room Concrete Support Structure Leakage, dated July 17, 2012 (ADAMS Accession No. ML12199A409 Entergy Nuclear Operations, Inc. (END) submitted Reference 1 containing commitments related to monitoring and repairs of the safety injection refueling water (SIRW) tank at the Palisades Nuclear Plant (PNP). Subsequently, the Nuclear Regulatory Commission (NRC) issued a Confirmatory Action Letter (CAL) dated July 17,2012 (Reference 2), which reiterated those commitments.
As a result of successful repairs to the SIRW tank, it is necessary to revise the CAL commitments. This letter closes three commitments, and revises two commitments made in Reference 2. The commitment summary is provided in Attachment 1.
PNP 2013-050 Document Control Desk Page 2 Sincerely, AJV/bed : Commitment Summary CC Administrator, Region III, USNRC Project Manager, Palisades, USNRC Resident Inspector, Palisades, USNRC Commitment Summary The following commitments are being closed:
CAL Commitment 1:
ENO will measure and trend leakage daily from the SIRW tank in accordance with the approved Operational Decision-Making Issue (ODMI) document until such a time as the SIRW tank is no longer classified as degraded/nonconforming for this adverse condition. The degradation growth rate will be calculated to determine the need for future SIRW tank inspections. ENO will re-perform the growth rate calculation periodically, depending on changes in observed leakage rate.
Resolution:
Modifications have been made and maintenance has been performed to the SIRW tank that returned the tank to an operable status. The degraded/nonconforming condition no longer exists.
CAL Commitment 2:
ENO will declare the SIRW tank inoperable and shut down the plant, as required by Technical Specifications, prior to, or upon reaching:
- a.
The ODMI calculated leakage rate of 38 gallons per day from the SIRW tank or;
- b.
The predicted time allowed (tallow defined in American Society of Mechanical Engineers (ASME) Code Case N-705, "Evaluation Criteria for Temporary Acceptance of Degradation in Moderate Energy Class 2 or 3 Vessels and Tanks," dated October 12, 2006), at which the detected degradation will grow to the maximum structurally allowable size, becomes less than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
ENO will notify the NRC prior to changing any of the limits specified in the above criteria. NRC staff will not provide concurrence on the proposed limit change.
Resolution:
Modifications have been made and maintenance has been performed to the SIRW tank that returned the tank to an operable status. The degraded/nonconforming condition no longer exists.
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CAL Commitment 3:
If monitoring determines that the SIRW tank is actively leaking, ENO will take appropriate actions to repair the tank within 26 months of the identification of the leak, as specified by ASME Code Case N-705.
Resolution:
Modifications have been made and maintenance has been performed to the SIRW tank that returned the tank to an operable status. The degraded/nonconforming condition no longer exists.
The following commitments are being revised:
Current CAL Commitment 4: ENO will continue inspections of the concrete support structure above the control room, control room hallway, and the concrete support structure ceiling as prescribed in the approved ODMI. These inspections are to ensure that the temporary modifications installed to prevent impact to safety-related structures, systems and components are performing their intended functions.
Revised commitment: ENO will continue inspections of the concrete support structure above the control room, control room hallway, and the concrete support structure ceiling as prescribed in the approved Operations Standing Order. These inspections are to ensure that the temporary modifications installed to prevent impact to safety-related structures, systems and components are performing their intended functions.
Justification: The previous SIRW tank ODMI is being canceled and an Operations Standing Order has been issued.
Current CAL commitment 5: ENO will correct the adverse condition related to cracking of the concrete support structure around the ceiling of the control room, which could lead to water intrusion, prior to restart from the 2013 refueling outage.
Revised commitment: ENO will correct the adverse condition related to cracking of the concrete support structure around the ceiling of the control room, which could lead to water intrusion, prior to restart from the next refueling outage.
Justification: The refueling outage may be rescheduled to early 2014.
Additional corrective actions and monitoring will be tracked by site processes, in accordance with 10 CFR 50, Appendix B.
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