ML19077A367

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March 14, 2019 Pre-submittal Meeting TS DNBR Safety Limit Change LAR Meeting Slides
ML19077A367
Person / Time
Site: Harris Duke Energy icon.png
Issue date: 03/14/2019
From: Martha Barillas
Plant Licensing Branch II
To:
Barillas M DORL/LPL2-2 301-415-2760
References
Download: ML19077A367 (12)


Text

Harris Nuclear Plant Pre-Submittal Meeting

March 2019

License Amendment Request to Modify the Departure from Nucleate Boiling Ratio Safety Limit to Address Transition to New Fuel Type 2

Duke Energy Attendees Art Zaremba (Manager, Nuclear Fleet Licensing)

Dennis Earp (Fleet Regulatory Affairs)

Jeff Abbott (Manager, Safety Analysis)

James Reed (Safety Analysis) 3 3

Outline Background Information Technical Content Precedent Proposed Changes Applicable Regulatory Requirements/Criteria 4

Background Information Starting with Cycle 24 (Spring 2021), HNP will start transitioning from Framatome Inc. 17x17 HTP fuel to their GAIA fuel design 8 GAIA LTAs introduced in Cycle 20 core in non-limiting locations Cycle 21 design utilized 8 Cycle 22 design utilized 4 No hydraulic dissimilarities between fuel types that would adversely affect performance of the reactor core in full core (GAIA or HTP) or LTA mixed core configurations 5

Background Information NRC has previously reviewed and approved FramatomesTopical Report ANP-10341P-A,

The ORFEO-GAIA and ORFEO-NMGRID Critical Heat Flux Correlations

[ADAMS Accession No. ML18236A371]

NRC has previously reviewed and approved the following Duke Energy methodologies for

use by HNP:

DPC-NE-2005-P-A, Revision 5, Thermal Hydraulic Statistical Core Design Methodology,

[ADAMS Accession No. ML16049A630]

DPC-NE-3008-P-A, Revision 0, Thermal-Hydraulic Models for Transient Analysis,

[ADAMS Accession No. ML18060A404 (Package)]

DPC-NE-3009-P-A, Revision 0, FSAR/UFSAR Chapter 15 Transient AnalysisMethodology,

[ADAMS Accession No. ML18060A404 (Package)]

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Background Information Changes necessary to implement GAIA fuel into Duke Energy methods:

Validation of the ORFEO-GAIA critical heat flux correlation used with the VIPRE-01 thermal hydraulic code Calculation of a safety limit for Duke Energys implementation of the ORFEO-GAIA correlation and inclusion in TS 2.1.1.a Calculation of a statistical core design limit for GAIA fuel using the ORFEO-GAIA correlation Development of a mixed core penalty using VIPRE-01 to apply to analysis results for cores containing both 17x17 HTP and GAIA fuel 7

Technical Content Duke Energy is utilizing the same approach used in the Framatome Topical Report in implementing and validating the ORFEO-GAIA correlation with VIPRE-01 The limits and conditions applicable to the ORFEO-GAIA and ORFEO-NMGRID correlations will apply to Duke Energys use of the correlations with VIPRE-01 Submitting a proposed appendix to DPC-NE-2005-P-A that contains the details of the GAIA VIPRE-01 model and details and results of Duke Energys evaluation of the ORFEO-GAIA correlation with VIPRE-01 Establishes safety limit for GAIA fuel Calculation of statistical design limit for GAIA fuel Addressing the application of expanded VIPRE-01 models with mixed cores 8

Precedent Duke Energy reviewed the LARs and NRC approvals of other licensees (listed below), and the approach Duke Energy intends to take is similar to other licensees.

Arkansas Nuclear One: Application dated May 13, 2009 (ADAMS Accession No.

ML091340153); Supplement dated July 8, 2009 (ADAMS Accession No. ML092050637);NRC Safety Evaluation dated September 18, 2009 (ADAMS Accession No. ML092460118)

Modified DNBR safety limit based on a new fuel design and the associated DNB correlations Callaway Plant, Unit 1: Application dated May 8, 2015 (ADAMS Accession No. ML15132A137);

Supplement dated November 9, 2015 (ADAMS Accession No. ML1533A192); NRC Safety

Evaluation dated February 29, 2016 (ADAMS Accession No. ML16020A516)

Adjusted DNBR safety limit and addition of methodology for determining core operating limits 9

Proposed Changes Technical Specification 2.1.1.a Current 7KHGHSDUWXUHIURPQXFOHDWHERLOLQJUDWLR '1%5 VKDOOEHPDLQWDLQHGIRU

the HTP DNB correlation.

Proposed 7KHGHSDUWXUHIURPQXFOHDWHERLOLQJUDWLR '1%5 VKDOOEHPDLQWDLQHGIRU

WKH+73'1%FRUUHODWLRQIRU+73IXHODQGIRUWKH25)(2-GAIA DNB correlation for GAIA fuel.

Technical Specification 6.9.1.6.2 Addition of ANP-10341P-A, The ORFEO-GAIA and ORFEO-NMGRID Critical Heat Flux Correlations Adjust page format to remove extraneous space between listed methodologies 10

Applicable Regulatory Requirements/Criteria 10 CFR 50.36, Technical Specifications Defines a safety limit as a limit upon important process variables that are found to be necessary to reasonably protect the integrity of certain physical barriers that guard against the uncontrolled release of radioactivity General Design Criterion (GDC) 10, Reactor Design Requires that specified fuel design limits are not exceeded during steady state operation, normal operational transients, and anticipated operational occurrences Accomplished by having a DNB design basis, which corresponds to a 95% probability at a 95% confidence level (95/95 DNB criterion) that DNB will not occur 11

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