ML25008A259
| ML25008A259 | |
| Person / Time | |
|---|---|
| Site: | 99902069 |
| Issue date: | 01/08/2025 |
| From: | NRC |
| To: | NRC/NRR/DANU |
| References | |
| Download: ML25008A259 (5) | |
Text
From:
Cayetano Santos Sent:
Wednesday, January 8, 2025 4:44 PM To:
Tomkins@kairospower.com; Joe-Nimique Cilliers Cc:
Brian Bettes; Josh Borromeo
Subject:
Audit Questions Related to Kairos Core Design and Analysis Methodology Topical Report Attachments:
4th set of audit questions Kairos core design TR for Prop Review FINAL Public Version_Redacted.pdf Jim and Joe-Nimique, Attached is the fourth set of audit questions related to the NRC staffs audit of Kaiross core design and analysis methodology topical report. This is the public version in which the proprietary and export-controlled information has been redacted. The non-public version has been shared with Kairos via the Box secure portal.
Please let me know if you have any questions.
Tanny Santos
Hearing Identifier:
KairosPower_PreApp_Public Email Number:
19 Mail Envelope Properties (MW4PR09MB901031BBEDA586EE5C0076F5E5122)
Subject:
Audit Questions Related to Kairos Core Design and Analysis Methodology Topical Report Sent Date:
1/8/2025 4:43:34 PM Received Date:
1/8/2025 4:43:00 PM From:
Cayetano Santos Created By:
Cayetano.Santos@nrc.gov Recipients:
"Brian Bettes" <Brian.Bettes@nrc.gov>
Tracking Status: None "Josh Borromeo" <Joshua.Borromeo@nrc.gov>
Tracking Status: None "Tomkins@kairospower.com" <Tomkins@kairospower.com>
Tracking Status: None "Joe-Nimique Cilliers" <JCilliers@kairospower.com>
Tracking Status: None Post Office:
MW4PR09MB9010.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 419 1/8/2025 4:43:00 PM 4th set of audit questions Kairos core design TR for Prop Review FINAL Public Version_Redacted.pdf 347743 Options Priority:
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Official Use Only - Proprietary and Export Controlled Information UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 KAIROS POWER, LLC - KP-FHR CORE DESIGN AND ANALYSIS METHODOLOGY TOPICAL REPORT FOURTH SET OF AUDIT QUESTIONS (EPID NO. L-2024-TOP-001 3)
. Section 5.3.5 "In ut Uncertainties " lists Please describe how these input uncertainties for ((
)) in the methodology.
[Question 5.3-1) Section 4, "Modeling Tools," states that "[t]he verification process consists of software benchmarking and numerical solution verification, and is described further in Section 5." However, no substantial description is found on verification of numerical solution in section 5, "Validation, Verification, and Uncertainty Anal sis."
Section 5.3.4 "Numerical Error and Solution Verification " brief! describes
)) Discuss the key observations and important conclusions for the methodology from this process.
[Question 5.4-3) Section 5.4, "Methodology for Updating NRFs [Nuclear Reliability tors] with O Official Use Only - Proprietary and Export Controlled Information
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[Question 7.1-1] Section 7.1, "Conclusions" states "The DEM methodology described in Section 3.3 of this topical report is acceptable for generating both a random packed pebble bed and TRISO distributions to use for a Serpent 2 baseline model geometry (Section 3.4) in thermal hydraulic validation benchmarks. These benchmarks, described in Section 5.3, are then used to inform the orous media models described in Section 3.5." Please describe how the es not exist in the topical report. Provide the reference to the correct section.
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[Question B.2-1 ] Please describe the reflector section B.2.2.1.2 "Reflector Heat Transfer."
[Question B.2-2] In Table B.1 -1, "Pebble Bed Cylinder Configurations," which cylinder is the most representative of the test reactor core?
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