ML19011A345
| ML19011A345 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 01/11/2019 |
| From: | Joel Wiebe Plant Licensing Branch III |
| To: | Steinman R Exelon Generation Co |
| References | |
| Download: ML19011A345 (2) | |
Text
1 NRR-DMPSPEm Resource From:
Wiebe, Joel Sent:
Friday, January 11, 2019 11:24 AM To:
Steinman, Rebecca L:(GenCo-Nuc) (Rebecca.Steinman@exeloncorp.com)
Subject:
Preliminary RAIs Regasrding Byron Request to Use ATF LTAs Preliminary RAIs are sent to ensure the information request is clear and understandable.
Based on the Supplement Dated December 18, 2018 (ADAMS Accession No. ML18352B11), and the Audit Conducted on January 4, 2019, the NRC staff requires the following information to complete its review.
- 1) As discussed in the supplement dated December 18, 2018, the ADOPTTM Lead Test Rods (LTRs) may be limiting in certain transient conditions. Clarify why this is consistent with Byron TS 4.2.1 or provide appropriate proposed updates to the technical specifications, with justification.
- 2) GDC 10-Reactor Design, states: The reactor core and associated coolant, control, and protection systems shall be designed with appropriate margin to assure that specified acceptable fuel design limits are not exceeded during any condition of normal operation, including the effects of anticipated operational occurrences. The following information is needed to provide reasonable assurance of acceptable performance under normal operations, including the effects of anticipated operational occurrences.
Page 12 of 20 of Exelons March 8, 2018 (ADAMS Accession No. ML18067A431), letter states that the current PAD code is capable of modeling ADOPTTM fuel pellets. The letter then subsequently discusses the material properties and fuel performance models that are being updated for coated cladding and uranium silicide fuel, resulting in a fuel performance code designated as PAD-ATF. Separately on page 14 of 20, there is a paragraph discussing the fuel performance of the ADOPTTM pellets that states that the ADOPTTM pellet has essentially the same heat capacity, thermal diffusivity, thermal expansion coefficient, and melting temperature as standard uranium dioxide.
Clarify these statements to state whether or not PAD-ATF is applicable to the ADOPTTM pellet or if the current PAD code (without the modifications for uranium silicide and the coated clad) is applicable to the ADOPTTM pellet. Include a list of which models (if using PAD-ATF) or inputs (if using PAD) are changed for ADOPTTM pellets versus standard UO2 pellets. State whether the known ADOPTTM material properties, including irradiated properties, have been considered in the LTR design and safety assessments.
Hearing Identifier:
NRR_DMPS Email Number:
754 Mail Envelope Properties (SN6PR0901MB2447A2EC160A108512DB18F58B850)
Subject:
Preliminary RAIs Regasrding Byron Request to Use ATF LTAs Sent Date:
1/11/2019 11:23:41 AM Received Date:
1/11/2019 11:23:00 AM From:
Wiebe, Joel Created By:
Joel.Wiebe@nrc.gov Recipients:
"Steinman, Rebecca L:(GenCo-Nuc) (Rebecca.Steinman@exeloncorp.com)"
<Rebecca.Steinman@exeloncorp.com>
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