W3F1-2005-0074, License Amendment Request NPF-38-265 to Allow the Use of Zirconium Diboride and Modify Technical Specification 6.9.1.11, Core Operating Limits Report
| ML053040089 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 10/25/2005 |
| From: | Walsh K Entergy Nuclear South, Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| W3F1-2005-0074 | |
| Download: ML053040089 (15) | |
Text
Ente8gy Entergy Nuclear South Entergy Operations, Inc.
17265 River Road Killona, LA 70057 Tel 504 464 3178 Kevin T. Walsh General Manager. Plant Operations Waterford 3 W3F1 -2005-0074 October 25, 2005 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
SUBJECT:
License Amendment Request NPF-38-265 To Allow the Use of Zirconium Diboride and Modify Technical Specification 6.9.1.11, Core Operating Limits Report Waterford Steam Electric Station, Unit 3 Docket No. 50-382 License No. NPF-38
Dear Sir or Madam:
Pursuant to 10 CFR 50.90, Entergy Operations, Inc. (Entergy) hereby requests an amendment to the Waterford Steam Electric Station, Unit 3 (Waterford 3) Technical Specifications (TS). The proposed change to TS 6.9.1.11, Core Operating Limits Report will result in the addition of a methodology that will allow the use of zirconium diboride (ZrB2) burnable absorber coating on fuel pellets.
The proposed change has been evaluated in accordance with 10 CFR 50.91 (a)(1) using criteria in 10 CFR 50.92(c) and it has been determined that this change involves no significant hazards consideration. The bases for these determinations are included in the attached submittal.
The proposed change includes new commitments as summarized in Attachment 3. The NRC has approved similar Technical Specification changes for other plants, including Arkansas Nuclear One, Unit 2.
Entergy requests approval of the proposed amendment by September 18, 2006 in order to support the fall 2006 refueling outage. Once approved, the amendment shall be implemented within 30 days. Although this request is neither exigent nor emergency, your prompt review is requested.
If you have any questions or require additional information, please contact Dana Millar at 601-368-5445.
W3FI-2005-0074 Page 2 of 3 I declare under penalty of perjury that the foregoing is true and correct. Executed on October 25, 2005.
Sincerely, KTW/DM/cbh Attachments:
- 1. Analysis of Proposed Technical Specification Change
- 2. Proposed Technical Specification Changes (mark-up)
- 3. List of Regulatory Commitments
W3F1-2005-0074 Page 3 of 3 cc:
Dr. Bruce S. Mallett U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 NRC Senior Resident Inspector Waterford 3 P.O. Box 822 Killona, LA 70066-0751 U.S. Nuclear Regulatory Commission Attn: Mr. Nageswaran Kalyanam MS 0-7D1 Washington, DC 20555-0001 Wise, Carter, Child & Caraway Attn: J. Smith P.O. Box 651 Jackson, MS 39205 Winston & Strawn Attn: N.S. Reynolds 1700 K Street, NW Washington, DC 20006-3817 Louisiana Department of Environmental Quality Office of Environmental Compliance Surveillance Division P. O. Box 4312 Baton Rouge, LA 70821-4312 American Nuclear Insurers Attn: Library Town Center Suite 300S 29t S. Main Street West Hartford, CT 06107-2445
Attachment I W3FI-2005-0074 Analysis of Proposed Technical Specification Change
Attachment I to W3F1 -2005-0074 Page 1 of 6
1.0 DESCRIPTION
This letter is a request to amend Operating License NPF-38 for Waterford Steam Electric Station, Unit 3 (Waterford 3). The proposed change will revise the Operating License to supplement the list of the analytical methods referenced in Technical Specification (TS) 6.9.1.11.1 with a methodology that will allow the use of zirconium diboride (ZrB2) burnable absorber coating on fuel pellets.
Approval of the proposed change is requested by September 18, 2006 in order to support the fall 2006 refueling outage.
2.0 PROPOSED CHANGE
The proposed change will add a reference to the topical report (WCAP-16072-P-A) that supports the use of ZrB2 burnable absorber coating on fuel pellets to the list of NRC reviewed and approved analytical methods included in Waterford 3 TS 6.9.1.11.1.
3.0 BACKGROUND
A change in the burnable absorbers is planned for Waterford 3 Cycle 15 (fall 2006). The change reflects a transition from Erbia integral burnable absorber, which is mixed in the fuel, to a burnable absorber using ZrB2 coating. Zirconium diboride burnable absorbers were introduced to Westinghouse cores in the mid-1980's as Integral Fuel Burnable Absorbers (IFBA). The description of IFBA was originally documented in WCAP-10444-P-A, 'Reference Core Report Vantage 5 Assembly" September 1985. The use of ZrB2 burnable absorbers in Combustion Engineering (CE) fuel assemblies is addressed separately in WCAP-16072-P-A, "Implementation of Zirconium Diboride Burnable Absorber Coatings in CE Nuclear Power Fuel Assembly Designs".
The topical report, WCAP-1 6072-P-A, includes a detailed description of the ZrB2 burnable absorber and summarizes the evaluation of the effects of the ZrB2 material characteristics on design and safety analyses, including loss of coolant accident (LOCA) analyses. The current reload methodologies can be used with the implementation of the ZrB2 burnable absorber.
Changes in the safety analyses or safety methods are addressed directly or via reference through WCAP-16072-P-A.
Waterford 3 TS 2.1.1.2 requires that the peak fuel centerline temperature be maintained less than 50800F (decreasing by 580F per 10,000 MWDIMTU for burnup and adjusting for burnable poisons per approved topical reports). Therefore, the impact of ZrB2was evaluated in relationship to the fuel centerline temperature. By design ZrB2 is coated onto the outer surface of the uranium dioxide (UO2) fuel pellets prior to loading into the fuel rod cladding tubes rather than being mixed with the U0 2 directly as is done with other integral fuel burnable absorber materials. Therefore, ZrB2 does not impact the U0 2 melting point since it is coated onto the outer surface of the pellet and not mixed into the U0 2.
Attachment I to W3F1-2005-0074 Page 2 of 6
4.0 TECHNICAL ANALYSIS
The final NRC Safety Evaluation (SE) for WCAP-16072-P-A, "Implementation of Zirconium Diboride Burnable Absorber Coatings in CE Nuclear Power Fuel Assembly Designs" includes five conditions and limitations which require response. The conditions and Waterford 3's responses are below.
Condition 1 A license amendment is required to add this TR to the Core Operating Limits Report analytical methods listed in the licensee's TS.
Response I This license amendment request includes the TS change required by this condition.
Condition 2 Plant-specific core design guidelines or cycle-specific calculation shall be used to verify that required power margins in the axial cutback regions are maintained within safety analysis limitations.
Response 2 Cycle specific evaluations will be performed as part of the reload efforts to verify that required power margins in the axial cutback regions are maintained within the safety analysis limitations.
Condition 3 Plant TS SRs [surveillance requirement] on MTC [moderator temperature coefficient]
validate the physics predictions and ensure that plant operations remain within allowable limits. In addition to current SRs, licensees shall confirm that the peak positive HFP [hot full power] MTC is within the TS limits at the highest RCS [reactor coolant system] soluble boron concentration predicted during full power operation.
The peak positive HFP MTC shall be derived by adjusting the measured MTC at HFP BOC [beginning of cycle] conditions to the maximum HFP soluble boron concentration expected during the cycle. In order to ensure a conservative adjustment, a direct measurement of MTC is required at the highest RCS soluble boron concentration predicted during full power operation. This direct measurement is only required for the first application of ZrB2 IFBA in a CE [Combustion Engineering] 14 x 14 or 16 x 16 fuel assembly design. During the first cycle implementation, Westinghouse shall provide the staff with a letter containing the following information:
- i. Measured HFP BOC MTC (TS SR),
ii. Measured HFP MTC at highest RCS soluble boron concentration, and iii. Calculated HFP MTC at highest RCS soluble boron concentration, and iv. Demonstrated accuracy of the calculated HFP MTC within current analytical uncertainties.
. to W3Fl-2005-0074 Page 3 of 6 In addition, plant procedures used to perform MTC surveillances shall be updated, where appropriate, to reflect the calculated peak positive HFP MTC along with ZrB2 IFBA's distinctive trend in RCS critical boron concentration.
Response 3 An MTC test at the highest RCS soluble boron concentration predicted during full power operation to confirm that the MTC is within the TS limits at the peak boron concentration is not required since Arkansas Nuclear One, Unit 2 was the Combustion Engineering lead plant for the use of ZrB2 as a burnable absorber coating on the fuel pellets and validated the methodology.
Plant procedures will be modified as needed to reflect the calculated peak HFP MTC along with ZrB2 IFBAs distinctive trend in RCS critical boron concentration.
Condition 4 Prior to startup following a Condition IlIl or IV event, licensees must evaluate clad hydriding to ensure that hydrides have not precipitated in the radial direction (in accordance with section 3.2 of this SE).
Response 4 In the event of a Condition IlIl or IV event at Waterford 3, an evaluation of fuel structural integrity with respect to radial hydriding will be performed prior to power ascension. This commitment refers only to an actual Condition IlIl or Condition IV occurrence at the plant that could potentially result in fuel damage, and would not allow for an immediate plant restart. The evaluation would likely be similar to the information provided in RAI [request for additional information] response in Items 6 of Appendix H of WCAP-16072-P-A, relying on the fact that the conditions necessary to allow radial hydriding would not have existed, and therefore the possibility of radial hydriding need not be considered further. Since this condition applies to an actual event and not to licensing calculations for this event, such evaluation would be based on best estimate assumptions and/or known plant conditions.
Condition 5 CEN-372-P-A constraints and limitations with regard to rod internal pressure and DNB propagation must continue to be met. In addition, licensees must ensure that the following two conditions are satisfied:
- a. For Condition I (normal), Condition II (moderate frequency), and Condition IlIl (infrequent) events, fuel cladding burst must be precluded for ZrB2 IFBA fuel rods.
Using models and methods approved for CE fuel designs, licensees must demonstrate that the total calculated stress remains below cladding burst stress at the cladding temperatures experienced during any potential Condition II or Condition IlIl event. Within the confines of the plant's licensing basis, licensees
- to W3Fl-2005-0074 Page 4 of 6 must evaluate all Condition II events in combination with any credible, single active failure to ensure that fuel rod burst is precluded.
- b. For Condition IV non-LOCA events which predict clad burst, the potential impacts of fuel rod ballooning and bursting need to be specifically addressed with regard to coolable geometry, RCS pressure, and radiological source term.
Response 5 The constraints and limitations of CEN-372-P-A will continue to be met. Analyses as part of the Waterford 3 reload efforts will be performed in support of the generic implementation of ZrB2fuel.
5.0 REGULATORY ANALYSIS
5.1 Applicable Regulatory Requirements/Criteria The proposed change has been evaluated to determine whether applicable regulations and requirements continue to be met. Entergy has determined that the proposed change does not require any exemptions or relief from regulatory requirements, other than the Technical Specification (TS), and does not affect conformance with any General Design Criterion (GDC) differently than described in the Updated Final Safety Analysis Report (UFSAR).
5.2 No Significant Hazards Consideration The proposed change will modify Waterford Steam Electric Station, Unit 3 (Waterford 3)
Technical Specifications (TS) 6.9.1.11, Core Operating Limits Report (COLR) to support the use of zirconium diboride (ZrB2) burnable absorber coating on fuel pellets. Specifically WCAP-16072-P-A, implementation of Zirconium Diboride Burnable Absorber Coatings in CE Nuclear Power Fuel Assembly Designs" will be added to the list of NRC approved methodologies that can be utilized to determine the core operating limits.
Entergy Operations, Inc. has evaluated whether or not a significant hazards consideration is involved with the proposed amendment(s) by focusing on the three standards set forth in 10 CFR 50.92, 'Issuance of amendment," as discussed below:
- 1.
Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated?
Response: No.
The proposed change will add topical report WCAP-16072-P-A to the NRC reviewed and approved analytical methods used to determine the core operating limits. The topical report has been previously approved by the NRC for use in Combustion Engineering core designs and as such, the proposed change is administrative in nature and has no impact on any plant configurations or on system performance that is relied upon to mitigate the consequences of an accident. In addition, prior to the use of the ZrB2 burnable absorber coating, fuel design will be analyzed with applicable NRC staff approved codes and methods.
- to W3Fl-2005-0074 Page 5 of 6 Therefore, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.
- 2.
Does the proposed change create the possibility of a new or different kind of accident from any accident previously evaluated?
Response: No.
The proposed change adds a reference to the topical report that allows the use of ZrB2 as a burnable absorber coating on the fuel pellet. The topical report has been previously approved by the NRC for use in Combustion Engineering core designs and as such, the proposed change is administrative in nature and has no impact on any plant configurations or on system performance that is relied upon to mitigate the consequences of an accident. In addition, prior to the use of the ZrB2 burnable absorber coating, fuel design will be analyzed with applicable NRC staff approved codes and methods. This change is administrative in nature and does not create a new or different type of accident than previously evaluated because the design requirements for the facility remain the same.
Therefore, the proposed change does not create the possibility of a new or different kind of accident from any previously evaluated.
- 3.
Does the proposed change involve a significant reduction in a margin of safety?
Response: No.
The proposed change will add WCAP-16072-P-A to the list of referenced topical reports. The topical report has been previously approved by the NRC for use in Combustion Engineering core designs and as such, the proposed change is administrative in nature and has no impact on any plant configurations or on system performance that is relied upon to mitigate the consequences of an accident. In addition, prior to the use of the ZrB2 burnable absorber coating, fuel design will be analyzed with applicable NRC staff approved codes and methods.
Therefore, the proposed change does not involve a significant reduction in a margin of safety.
Based on the above, Entergy concludes that the proposed amendment(s) present no significant hazards consideration under the standards set forth in 10 CFR 50.92(c), and, accordingly, a finding of 'no significant hazards consideration" is justified.
5.3 Environmental Considerations The proposed amendment does not involve (i) a significant hazards consideration, (ii) a significant change in the types or significant increase in the amounts of any effluent that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed amendment meets the eligibility criterion for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10 CFR
- to W3F1-2005-0074 Page 6 of 6 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed amendment.
6.0 PRECEDENCE NRC letter to Arkansas Nuclear One, Unit 2 (ANO-2) dated March 23, 2005 includes the NRC's Safety Evaluation (SE) for changes that were proposed for ANO-2 in support of core reload activities. One of the proposed changes was the addition of the Westinghouse topical report WCAP-16072-P-A. ANO-2 was the Combustion Engineering lead plant for implementing ZrB2 as a burnable absorber coating on fuel pellets and therefore direct measurement of MTC at the highest boron concentration required by Condition 3 of the topical report is not required to be performed by Waterford 3. The NRC asked ANO-2 one additional question in regard to the use of ZrB2. The response to the question is included in Waterford 3's response to Condition 4 of the topical report.
W3FI -2005-0074 Proposed Technical Specification Changes (mark-up) to W3FI-2005-0074 Page 1 of 2 ADMINISTRATIVE CONTROLS CORE OPERATING LIMITS REPORT COLR (Continued)
- 6) "CESEC - Digital Simulation for a Combustion Engineering Nuclear Steam Supply System," (CE letter LD-82-001 and NRC SE to CE dated April 3. 1984). (Methodology for Specification 3.1.1.1 and 3.1.1.2 for Shutdown Margins, 3.1.1.3 for MTC, 3.1.3.1 for Movable Control Assemblies - CEA Position. 3.1.3.6 for Regulating and group P CEA Insertion Limits, and 3.2.3 for Azimuthal Power Tilt).
- 7) "Qualification of Reactor Physics Methods for the Pressurized Water Reactors of the Entergy System," ENEAD-01-P. (Methodology for Specifications 3.1.1.1 and 3.1.1.2 for Shutdown Margins, 3.1.1.3 for MTC, 3.1.3.6 for Regulating and group P CEA Insertion Limits, 3.1.2.9 Boron Dilution (Calculation of CBC & IBW), and 3.9.1 Boron Concentration).
- 8) 'Fuel Rod Maximum Allowable Gas Pressure,' CEN-372-P-A. (Methodology for Specification 3.2.1, Unear Heat Rate).
- 9) "Technical Description Manual for the CENTS Code," WCAP-15996-P-A. (Methodology for Specification 3.1.1.1 and 3.1.1.2 for Shutdown Margins, 3.1.1.3 for MTC, 3.1.3.1 for Movable Control Assemblies - CEA Position, 3.1.3.6 for Regulating and group P CEA Insertion Limits, and 3.2.3 for Azimuthal Power Tilt).
CENPD-132, Supplement 4-P-A. (Methodology for Specification 3.1.1.3 for MTC, 3.2.1 for Linear Heat Rate, 3.2.3 for Azimuthal Power Tilt and 3.2.7 for ASI).
- 11) 'Implementation of ZIRLO Material Cladding in CE Nuclear Power Fuel Assembly Designs," CENPD-404-P-A (Methodology for Specification 3.1.1.3 for MTC, 3.2.1 for Linear Heat Rate, 3.2.3 for Azimuthal Power Tilt, and 3.2.7 for ASI).
- 12) 'Qualification of the PHOENIX-P/ANC Nuclear Design System For Pressurized Water Reactor Cores," WCAP-1 1596-P-A; "ANC: A Westinghouse Advanced Nodal Computer Code," WCAP-1 0965-P-A; and "ANC: A Westinghouse Advanced Nodal Computer Code:
Enhancements to ANC Rod Power Recovery," WCAP-1 0965-P-A Addendum 1.
(Methodology for Specifications 3.1.1.1 and 3.1.1.2 for Shutdown Margins. 3.1.1.3 for MTC, 3.1.3.6 for Regulating and group P CEA Insertion Limits, 3.1.2.9 Boron Dilution (Calculation of CBC & IBW), and 3.9.1 Boron Concentration).
- 13) "Qualification of the Two-Dimensional Transport Code PARAGON,' WCAP-1 6045-P-A (Methodology for Specifications 3.1.1.1 and 3.1.1.2 for Shutdown Margins, 3.1.1.3 for MTC, 3.1.3.6 for Regulating and group P CEA Insertion Limits, 3.1.2.9 Boron Dilution (Calculation of CBC & IBW), and 3.9.1 Boron Concentration).
6.9.1.11.2 The core operating limits shall be determined such that all applicable limits (e.g., fuel thermal limits, core thermal-hydraulic limits, ECCS limits, nuclear limits such as shutdown margin, and transient and accident analysis limits) of the safety analysis are met.
6.9.1.11.3 The CORE OPERATING LIMITS REPORT, including any mid-cycle revisions or supplements thereto, shall be provided upon issuance, for each reload cycle, to the NRC Document Control Desk with copies to the Regional Administrator and Resident Inspector.
AMENDMENT NO. 402*,
45G WATERFORD - UNIT 3 6-20a A82-488, q 9,9,; ift to W3FI-2005-0074 Page 2 of 2 INSERT (14) Implementation of Zirconium Diboride Burnable Absorber Coatings in CE Nuclear Power Fuel Assembly Designs," WCAP-16072-P-A (Methodology for Specification 3.1.1.3 for MTC, 3.2.1 for Linear Heat Rate, 3.2.3 for Azimuthal Power Tilt, and 3.2.7 for ASI).
W3FI-2005-0074 List of Regulatory Commitments to W3F1 -2005-0074 Page 1 of 1 List of Regulatory Commitments The following table identifies those actions committed to by Entergy in this document. Any other statements in this submittal are provided for information purposes and are not considered to be regulatory commitments.
TYPE (C eck one)
SCHEDULED ONE-CONTINUING COMPLETION COMMITMENT TIME COMPLIANCE DATE (If ACTION Required)
Prior to the use of ZrB2 burnable absorber coatings, the fuel design will be analyzed with applicable NRC X
staff approved codes and methods.
Plant procedures will be modified as needed to reflect the calculated peak HFP MTC along with X
ZrB2 IFBAs distinctive trend in RCS critical boron concentration.
In the event of a Condition IlIl or IV event at Waterford 3, an evaluation of fuel structural integrity X
with respect to radial hydriding will be performed prior to power ascension.
Analyses as part of the Waterford 3 reload efforts will be performed in support of the generic X
implementation of ZrB2 fuel.