05000482/LER-2025-001, Improperly Breached Control Building Doors Cause a Condition Prohibited by Technical Specifications
| ML25351A282 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 12/17/2025 |
| From: | Carlson E Wolf Creek |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 001274 LER 2025-001-00 | |
| Download: ML25351A282 (0) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 4822025001R00 - NRC Website | |
text
P.O. Box 411 l Burlington, KS 66839 l 620-364-8831 Eric D. Carlson Plant Manager December 17, 2025 001274 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
Subject:
Docket No. 50-482: Licensee Event Report 2025-001-00, Improperly Breached Control Building Doors Cause a Condition Prohibited by Technical Specifications Commissioners and Staff:
The enclosed Licensee Event Report (LER) 2025-001-00 is being submitted pursuant to 10 CFR 50.73(a)(2)(i)(B) regarding an operation or condition prohibited by Wolf Creek Generating Stations Technical Specifications.
This letter contains no commitments. If you have any questions concerning this matter, please contact me at (620) 364-8831 extension 4570, or Dustin Hamman at (620) 364-4204.
Sincerely, Eric D. Carlson EDC/jkt
Enclosure:
LER 2025-001-00 cc:
A. N. Agrawal (NRC), w/e S. S. Lee (NRC), w/e J. D. Monninger (NRC), w/e Senior Resident Inspector (NRC), w/e WC Licensing Correspondence, w/e - WO 25-001274
Abstract
Wolf Creek Generating Station
00482 4
Improperly Breached Control Building Doors Cause a Condition Prohibited by Technical Specifications 10 20 2025 2025 001 00 12 17 2025 6
0
Jason Knust, Lead Licensing Engineer 620-364-8831
All times are Central Daylight Time (CDT).
On 10/20/25, during Refueling Outage 27, 2 doors (Door 31011 and Door 33012) that are part of the control building envelope (CBE) boundary were discovered to be left open during core reload. Door 31011 was tied open without an active breach permit, and Door 33012 was left open in a manner inconsistent with the approved breach plan. Upon discovery, both doors were closed.
Both doors were open at the same time for approximately 13 minutes, from 0906 to 0919. The 2 doors being left open caused the CBE boundary to be inoperable. With the CBE boundary being inoperable while moving irradiated fuel, Technical Specification (TS) LCO 3.7.10 Required Action E.1 and E.2 require that core alterations and movement of irradiated fuel assemblies be suspended immediately. Since the CBE boundary was inoperable for 13 minutes while continuing to move irradiated fuel, this event is being reported under 10 CFR 50.73(a)(2)(i)(B) as an operation or condition prohibited by TS. Page of
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
052 050
SAFETY SIGNIFICANCE
There were no actual safety consequences. Although the CBE boundary was inoperable for a short duration, the CREVS remained functional, and no unfiltered in-leakage occurred. The event did not result in actual exposure or compromise of safety systems. The safety function to protect the control room inhabitants was maintained. During a licensing basis fuel handling accident, the open doors would affect the calculated control room dose; however, the impact is negligible and would not challenge the 5 TEDE control room dose limit.
OPERATING EXPERIENCE/PREVIOUS EVENTS A review of WCGS LERs submitted in the last three years identified no similar LERs.
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Wolf Creek Generating Station (WCGS) 00482 2025 001 00