ML23052A067

NRR E-mail Capture - Abilene Christian University - Audit Question Regarding the Acu CP Technical Topics Audit

ML23052A067
Person / Time
Site:	05000610
Issue date:	02/21/2023
From:	Edward Helvenston NRC/NRR/DANU
To:	Towell R Abilene Christian University (ACU)
References
Download: ML23052A067 (2)

Text

From: Edward Helvenston Sent: Tuesday, February 21, 2023 8:16 AM To: Rusty Towell; Lester Towell; Jordan Robison; Tim Head; Alexander Adams Cc: Richard Rivera; Zackary Stone; Michael Wentzel; Michelle Hayes

Subject:

Abilene Christian University - Audit Question Regarding the ACU CP Technical Topics Audit

Dear Dr. Towell,

Please see below for an additional question the NRC staff has prepared for Abilene Christian University (ACU) for the current CP Technical Topics Audit. The NRC staff would like to discuss this question within the scope of the Audit (see audit plan dated 1/13/2023, ML23013A089), and I am providing this in advance to facilitate discussion during an audit meeting. Once ACU is ready to discuss, please let us know and we can set up a meeting. We will add this e-mail, with the question, to public ADAMS. If you have any questions, please let Richie, Zack, or I know.

Question Question Number Gen-7 The PSAR uses the terms safety-related, non-safety-related, and important to safety to describe various MSRR structures, systems, and components (SSCs). The principal design criteria (PDCs) listed in PSAR Section 3.1 refer to SSCs as well as design conditions and functions that are important to safety. Other portions of the PSAR commonly refer to safety-related SSCs, including in discussing meteorological, hydrological, and seismic loading in PSAR Sections 3.2, 3.3, and 3.4. With respect to design of SSCs for seismic loading, PSAR Section 3.4 states that SSCs designated Seismic Category I are safety-related SSCs and those SSCs required to support shutdown and maintain the MSRR in a safe shutdown condition.

PSAR Section 3.5 states that MSRR systems and components are important to safety if they perform safety functions during normal operations or are required to prevent or mitigate the consequences of operational transients or accidents.

PSAR Section 3.5.2.1 states that:

Safety-related is a classification applied to items relied on to remain functional during and following a postulated accident to ensure the

• integrity of the MSRR facility safety-related infrastructure.

• capability to shut down the MSRR and maintain it in a safe shutdown condition.

However, it is not clear to the staff if the PSAR provides a consistent definition of the terms safety-related, non-safety-related, or important to safety, or if these terms are used consistently throughout the PSAR.

The NRC staff also notes that some codes and standards cited in the PSAR may use and/or contain definitions for these terms. It is not clear whether definitions in these codes and standards are intended to apply to the MSRR.

The NRC staff notes that an understanding of these concepts will be important in classifying and understanding the importance of various SSCs at a more detailed level. The staff requests clarification on the definitions of each of these terms and how ACU is applying them to categorize the SSCs in the MSRR design.

Thanks, Ed Ed Helvenston, U.S. NRC Non-Power Production and Utilization Facility Licensing Branch (UNPL)

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

Office of Nuclear Reactor Regulation (NRR)

O-6B22 (301) 415-4067

Hearing Identifier: NRR_DRMA Email Number: 1951 Mail Envelope Properties (BY5PR09MB595616B4FEB015EAA9398583E0A59)

Subject:

Abilene Christian University - Audit Question Regarding the ACU CP Technical Topics Audit Sent Date: 2/21/2023 8:16:06 AM Received Date: 2/21/2023 8:16:00 AM From: Edward Helvenston Created By: Edward.Helvenston@nrc.gov Recipients:

"Richard Rivera" <richard.rivera@nrc.gov>

Tracking Status: None "Zackary Stone" <Zackary.Stone@nrc.gov>

Tracking Status: None "Michael Wentzel" <Michael.Wentzel@nrc.gov>

Tracking Status: None "Michelle Hayes" <Michelle.Hayes@nrc.gov>

Tracking Status: None "Rusty Towell" <rxt01a@acu.edu>

Tracking Status: None "Lester Towell" <ldt20a@acu.edu>

Tracking Status: None "Jordan Robison" <jcr20b@acu.edu>

Tracking Status: None "Tim Head" <tlh07b@acu.edu>

Tracking Status: None "Alexander Adams" <axa20j@acu.edu>

Tracking Status: None Post Office: BY5PR09MB5956.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 2990 2/21/2023 8:16:00 AM Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: