ML26043A105
| ML26043A105 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 02/12/2026 |
| From: | Welt H Constellation Energy Generation |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| BYR LTR 2026-0006 | |
| Download: ML26043A105 (0) | |
Text
Constellation_
BYR LTR 2026-0006 February 12, 2026 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Byron Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455 10 CFR 50.55a
Subject:
Byron Station Submittal of the Snubber Program Plan for the Fifth Test Interval In accordance with the American Society of Mechanical Engineers (ASME) Operations and Maintenance of Nuclear Power Plants (OM Code), Subsection ISTA-3200, "Administrative Requirements," paragraph (a), attached for your information is a copy of the Byron Station Snubber Program Plan which complies with the requirements of ASME Code 2022 Edition. The fifth test interval for Units 1 and 2 began on July 16, 2025, and ends on July 15, 2037.
There are no regulatory commitments contained in this letter.
Should you have any questions concerning this report, please contact Zoe Cox at 779-231-6606.
Respectfully, IHU
Harris Welt Site Vice President Byron Station
Attachment:
ER-BY-330-1008, Rev 0, Snubber Program Plan, Fifth Test Interval cc: Regional Administrator - NRC Region Ill NRC Senior Resident Inspector-Byron Station NRC Project Manager, NRR-Byron Station Illinois Emergency Management Agency-Division of Nuclear Safety
BYR LTR 2026-0006 U.S. Nuclear Regulatory Commission Page 2 of 2 bee: Kevin Lueschen, Director, Licensing and Regulatory Affairs -Cantera (ECopy w/o atts)
Rebecca Steinman, Manager, Licensing (ECopy w/o atts)
Document Control Desk Licensing (ECopy with atts)
Zoe Cox, Regulatory Assurance Manager - Byron Station (ECopy w/o atts)
Jerry Armstrong, NRC Coordinator-Byron Station (ECopy w/o atts)
Constellation.
CONSTELLATION ENERGY GENERATION LLC BYRON GENERATING STATION 4450 North German Church Road Byron, IL, 61010 SNUBBER INSERVICE PROGRAM PLAN UNIT 1 FIFTH SNUBBER INTERVAL Commercial Service Date:
NRC Docket Number:
Fifth Interval:
September 16, 1985 50-454 July 16, 2025, through July 15, 2037 UNIT 2 FIFTH SNUBBER INTERVAL Commercial Service Date:
NRC Docket Number:
Fifth Interval:
Document Number:
Revision Number:
August 2, 1987 50-455 July 16, 2025, through July 15, 2037 ER-BY-330-1008 00 ER-BY-330-1008 Revision 0 Page 1 of 6 GSES PREPARED TRANSMITTAL PREPARED BY:
DATE:
-G-le_n_P-alm_e_r (-Pa-lm_e_r G-ro_u_p l-nt-er-na-tio-na-1) _____
REVIEWED BY:
SC,tltr ~<J.d.i DATE:
-S-c-ott-E-sp-os-ito;::;..(4cl'sESiS_E_S) __________
APPROVED BY: ~
~ ~.
Matt King (GSES) m;r-:
DATE:
CONSTELLATION ENERGY GENERATION ACCEPTANCE REVIEWED BY:
APPROVED BY:
Digitally signed by O'Donnell, O'Donnell, Serena J SerenaJ Date: 2026.01.21 11 :52:57 -06'00' DATE:
Snubber Program Engineer M
P t
- k Digitally signed by Murray, Patrick
- Urray, a rl(
Date: 2026.0l.2112:05:00 -06'00' DATE:
Engineering Programs Manager 01/14/26 01/14/26 01/14/26
CONSTELLATION ENERGY GENERATION LLC BYRON NUCLEAR POWER STATION UNITS I & 2 REVISION CONTROL SHEET ER-BY-330-1008 Revision 0 Page 2 of 6 Each time this document is revised, the following table should be completed to provide a detailed record of the revision history. Major changes should be outlined within the table below. Minor editorial and formatting revisions are not required to be logged.
REVISION DATE REVISION
SUMMARY
0 07/16/25 Initial issuance.
Developed by GSE Solutions as part of the Byron Generating Station Fifth Interval Snubber Program Update.
1 01/14/26 Reformatted to be consistent with other fleet documents.
Prepared: G. Palmer Reviewed: S. Esposito Approved: M. King TABLE OF CONTENTS SECTION
1.0 GENERAL
2.0 EXAMINATION, TESTING AND MONITORING REQUIREMENTS:
3.0 EXAMINATION AND TESTING METHODS:
4.0 EXAMINATION AND TESTING FREQUENCY:
6.0 EXAMINATION, TESTING AND MONITORING EVALUATION:
7.0 REPAIR, REPLACEMENT, AND MODIFICATION REQUIREMENTS:
8.0 SCHEDULING
9.0 REPORTS AND RECORDS:
1 GENERAL CONSTELLATION ENERGY GENERATION LLC BYRON NUCLEAR POWER STATION UNITS 1 & 2 ER-BY-330-1008 Revision 0 Page 3 of 6 1.1.
The examination, service life monitoring and testing of all safety related snubbers at Byron Nuclear Power Station (Byron) will be implemented and performed in accordance with ER-BY-330-1007, "Snubber In service Testing Program Procedure" to ensure the required operational readiness of these snubbers during a seismic or other event(s), initiating dynamic loads.
1.2.
The Snubber program, as defined within ER-BY-330-1007, establishes visual examination, operational readiness testing and service life monitoring requirements, pertaining to those mechanical and hydraulic snubbers that are required for safe shutdown of the reactor, maintaining the safe shutdown condition, mitigating the consequences of an accident, or to ensure the integrity of the reactor coolant pressure boundary.
1.2.1.
The examination boundaries include the snubber assembly from pin-to-pin, inclusive.
Integral and nonintegral snubber attachments outside the examination boundaries will be evaluated within the Byron ISi program, in accordance with the requirements of the ASME Code,Section XI, Code of Record.
1.2.2.
The snubbers included in this program are listed within Procedure BVP 200-6T1 and BVP 200-6T2. Visual Examination of Safety Related Snubbers, in accordance with ER-BY-330-1007.
1.3.
The Snubber Program described in ER-BY-330-1007 adheres to the requirements of ASME OM Code, Section 1ST, 2022 Edition, as required by 10CFR50.55a(b)(3)(v).
1.4.
The snubber program procedure, ER-BY-330-1007 establishes a visual examination program, an operational readiness testing program and a snubber service life monitoring program for hydraulic and mechanical snubbers in accordance with the requirements of Subsection ISTD, paragraphs ISTD-4000, ISTD-5000, ISTD-6000 respectively, and the applicable paragraphs of Subsection 1ST A.
2 EXAMINATION, TESTING AND SERVICE LIFE MONITORING REQUIREMENTS:
2.1 Visual examinations and oper~tional readiness testing will be performed to the extent specified within ER-BY-330-1007 and in accordance with Constellation fleet administrative procedures ER-AA-330-004 and ER-AA-330-010.
CONSTELLATION ENERGY GENERATION LLC BYRON NUCLEAR POWER STATION UNITS 1 & 2 ER-BY-330-1008 Revision 0 Page 4 of 6 2.2 Snubbers are grouped into defined test plan groups, (DTPG's) by design type, in accordance with ISTD-5252 for testing purposes. The DTPG's at Byron Unit 1 and 2 are specified in BVP 200-6T1, BVP 200-6T2.
2.3 The service life of all program snubbers will be monitored, and snubbers replaced or reconditioned as specified in ER-BY-330-1007 and required by Constellation fleet administrative procedure ER-AA-330-011 to ensure that the service life is not exceeded at or before the next scheduled system or plant outage, or during a period when the snubber is required to be operable. The replacement or reconditioning will be documented, and records retained as required by ER-BY-330-1007, in accordance with ASME, Section 1ST, Subsections ISTA and ISTD.
3 EXAMINATION AND TESTING METHODS:
3.1.
Visual examinations and operational readiness tests will be performed by individuals qualified in accordance with ISTA-1500(e). Visual examinations and operational readiness testing are performed to verify the requirements specified within ER-BY-330-1007 in accordance with ASME, Section 1ST, Subsection ISTA and Subsection ISTD.
4 EXAMINATION AND TESTING FREQUENCY:
4.1.
lnservice visual examinations and operational readiness testing will be performed at the frequency specified within the ER-BY-330-1007. Byron will perform 100% accessible and inaccessible snubber visual examinations every 10 years per ISTD-4253.
4.2.
Preservice visual examinations will be performed whenever new snubber locations are installed, or after system replacements or modifications in accordance with procedure ER-AA-330-004.
5.1.
Byron, Units 1 and 2 will implement Code Case OMN-31 at the beginning of the Fifth Snubber Interval, which allows the extension of the Interval from 10 years to 12 years.
Code Case OMN-31 Rev O is approved for use by the NRC in Regulatory Guide 1.192, Revision 5, published in March 2024.
6 6.1.
6.2.
6.3.
6.4.
7 7.1.
8 8.1.
8.2.
CONSTELLATION ENERGY GENERATION LLC BYRON NUCLEAR POWER STATION UNITS 1 & 2 EXAMINATION, TESTING AND MONITORING EVALUATION:
ER-BY-330-1008 Revision 0 Page 5 of 6 Snubbers that do not appear to conform to the visual examination requirements of the ER-BY-330-1007 and procedure ER-AA-330-004, will be reported for evaluation and appropriate corrective action.
Snubbers that do not appear to conform with the visual examination acceptance requirements and are later confirmed as operable as a result of operational readiness testing may be declared operable for the purpose of establishing the next visual examination interval, provided that the unacceptable condition did not affect operational readiness of the snubber or the supported system.
Snubbers that do not meet the operational readiness testing acceptance criteria in accordance with ER-BY-330-1007 and ER-AA-330-010 will be evaluated to determine the cause of the failure and appropriate corrective action will be taken.
The service life of a snubber is evaluated using manufacturing input and engineering information gained through consideration of the snubber inservice conditions and inservice operational readiness test results, in accordance with ER-BY-330-1007.
REPAIR, REPLACEMENT AND MODIFICATION REQUIREMENTS:
Repairs, replacements and modifications performed on snubbers under this program shall conform, as applicable, to the requirements specified within the Byrons repair and replacement program.
SCHEDULING:
The visual examinations and operational readiness testing schedules will be established, tracked, and maintained within the Byron engineering department.
The snubber inservice operational readiness testing program requires tracking of expanded or additional testing and/or examinations, as specified by ER-BY-330-1007 and, in accordance with Subsection ISTD.
CONSTELLATION ENERGY GENERATION LLC BYRON NUCLEAR POWER STATION UNITS 1 & 2 9
REPORTS AND RECORDS:
ER-BY-330-1008 Revision 0 Page 6 of 6 9.1.
Reports and records will be generated and retained as required by ER-BY-330-1007, in accordance with ISTA-9000 and ISTD-9000.
9.2.
Reports and records for the visual examinations and operational readiness testing will be maintained for all snubbers in the scope of the program.
9.3.
Applicable records and reports, as required for repair and replacements, will be maintained for all snubbers.
9.4.
Records of the service life of all hydraulic and mechanical snubbers included in the inservice testing program, including the date at which the service life commences, and associated installation and maintenance records will be maintained.