ML21215A115

NRR E-mail Capture - (External_Sender) Correction to WBN Chiller Replacement LAR

ML21215A115
Person / Time
Site:	Watts Bar
Issue date:	07/26/2021
From:	Wells R Tennessee Valley Authority
To:	Kimberly Green NRC/NRR/DORL/LPL2-2
References
Download: ML21215A115 (2)

Text

From: Wells, Russell Douglas <rdwells0@tva.gov>

Sent: Monday, July 26, 2021 9:31 AM To: Green, Kimberly Cc: Hulvey, Kimberly Dawn; Brown, Michael Anthony; Paul Schoepf; Carter, Thomas John

Subject:

[External_Sender] Correction to WBN Chiller Replacement LAR Kim A very specific methodology for attaching temporary chilled water to the safety related chillers was included in TVA letter to NRC, CNL-20-012, dated May 19, 2020, Application to Modify the Watts Bar Nuclear Plant Unit 1 and Unit 2 Technical Specifications for Main Control Room Chiller Completion Time Extension (WBN-TS-18-16), (ML20140A342). Specifically, in Section 3.2.1 of the enclosure to the TVA letter, TVA informed NRC that Connection to the AHU coils will be made by isolating the chilled water piping, removing the flex hoses between the AHU coils and the chilled water piping and then connecting the temporary chilled water supply and return hoses to the AHU coils using existing flange connections.

The above license amendment request was approved by the NRC in a letter to TVA, Watts Bar Nuclear Plant, Units 1 and 2 - Issuance of Amendment Nos. 145 and 51 for One-Time Change to Technical Specification 3.7.11 to Extend the Completion Time for Main Control Room Chiller Modifications (EPID L-2020-LLA-0114), dated May, 2021 (ML21078A484). Contrary to the quoted statement in the TVA letter to the NRC, TVA now plans to install permanent branch connections in order to connect the hoses using a permanent branch connection with isolation valve and flange. While this methodology is a more efficient and safer design it differs from what TVA informed the NRC. It is TVAs opinion that the difference in the design has no impact on the NRC safety evaluation. Therefore, TVA does not plan to submit a correction letter.

Please let me know if you have questions or comments. Thanks Russell D. Wells Senior Program Manager Nuclear Fleet Licensing W. 423-751-8130 M. 434-221-9318 E. rdwells0@tva.gov 1101 Market Street LP 4B-C, Chattanooga, TN 37402-2801

Hearing Identifier: NRR_DRMA Email Number: 1299 Mail Envelope Properties (DM8PR09MB6120EDA7600B77C75C9CD8578EE89)

Subject:

[External_Sender] Correction to WBN Chiller Replacement LAR Sent Date: 7/26/2021 9:31:03 AM Received Date: 7/26/2021 9:31:41 AM From: Wells, Russell Douglas Created By: rdwells0@tva.gov Recipients:

"Hulvey, Kimberly Dawn" <kdhulvey@tva.gov>

Tracking Status: None "Brown, Michael Anthony" <mabrown6@tva.gov>

Tracking Status: None "Paul Schoepf" <PSCHOEPF@ENERCON.COM>

Tracking Status: None "Carter, Thomas John" <tjcarter@tva.gov>

Tracking Status: None "Green, Kimberly" <Kimberly.Green@nrc.gov>

Tracking Status: None Post Office: DM8PR09MB6120.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 1808 7/26/2021 9:31:41 AM Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: