ML23157A331

Hermes CP Doc - Hermes CP Audit Questions 87-91 for Preliminary Safety Analysis Report Section 4.5 and Chapter 13

ML23157A331
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Site:	Hermes
Issue date:	06/06/2023
From:	NRC
To:	NRC/NRR/DANU
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From: Samuel Cuadrado de Jesus Sent: Tuesday, June 6, 2023 5:52 PM To: KairosPower-CPDocsPEm Resource

Subject:

Hermes CP Audit Questions 87-91 for Preliminary Safety Analysis Report Section 4.5 and Chapter 13 Attachments: Audit Questions 87 to 91 Hermes PSAR Chapters 4.5 and 13_Redacted.pdf Samuel Cuadrado de Jesús Project Manager Advanced Reactor Licensing Branch (UARL)

Division of Advanced Reactors and Non-Power Production and Utilization Facilities (DANU)

U.S. Nuclear Regulatory Commission Phone: 301-415-2946 Samuel.CuadradoDeJesus@nrc.gov

Hearing Identifier: KairosPower_CPDocs_Public Email Number: 42 Mail Envelope Properties (SA1PR09MB739228791FC37DDA80B5B0C08852A)

Subject:

Hermes CP Audit Questions 87-91 for Preliminary Safety Analysis Report Section 4.5 and Chapter 13 Sent Date: 6/6/2023 5:52:10 PM Received Date: 6/6/2023 5:52:13 PM From: Samuel Cuadrado de Jesus Created By: Samuel.CuadradoDeJesus@nrc.gov Recipients:

"KairosPower-CPDocsPEm Resource" <KairosPower-CPDocsPEm.Resource@nrc.gov>

Tracking Status: None Post Office: SA1PR09MB7392.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 333 6/6/2023 5:52:13 PM Audit Questions 87 to 91 Hermes PSAR Chapters 4.5 and 13_Redacted.pdf 132571 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

c. Is equation 5.5 or 5.6 used for both uptake and release? If so, does the diffusivity, D, for uptake correspond to the diffusivity in Flibe or graphite? For the release does D correspond to tritium transport in graphite?

d. The perfect absorber means mass transfer from the Flibe to graphite is not limited by tritium diffusion into graphite. How is this represented in the various diffusion equations?

88 MHA Table 13 shows the release fractions are (( )) for the pebbles. ((

Tritium

))

89 MHA ((

Tritium

)) If not, how is the pebble inventory ((

)) release determined?

90 MHA The reflector inventory corresponds to (( )) Are the release fractions from Table 17 of Tritium (( )) used for the MHA release as a function of time ((

)) Are the release fractions based on the ((

))

91 MHA (( )) assumes a (( )) Flibe TS which equates Tritium to a total Flibe tritium concentration of (( )) The staff is expecting the OL Chapter 14, Section 3.3 coolant system activity limit to include an upper bound Flibe activity. Is the staffs understanding correct?