ML23096A225

BWXT Nuclear Operations Group, Inc., Submittal of 60-Day Written Report for Event Notification Number EN-56336

ML23096A225
Person / Time
Site:	BWX Technologies
Issue date:	04/04/2023
From:	Freudenberger R BWXT
To:	Document Control Desk, Office of Nuclear Material Safety and Safeguards
Shared Package
ML23096A244	List: ML23096A225
References
23-019
Download: ML23096A225 (1)

Text

eWXroFFICIAL BVVX Technologies, Inc.

usE ONLv April 4, 2023 23-019 ATTN: Document Control Desk Director, Office of Nuclear Material Safety & Safeguards U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Reference:

License No. SNM-42, Docket 70-27

Subject:

60-Day Written Report for Event Notification Number EN-56336

Dear Sir or Madam,

Enclosed please find the BWXT Nuclear Operations Group, Inc. - Lynchburg (BWXT NOG-L) 60-Day Written Report for Event Notification (EN) 56336. The EN was reported under 10 CFR Part 70 Appendix A (b)(2).

On the evening of January 19, 2023, a spill occurred from overfilling the Annular Waste Organic Tank in BWXT NOG-L's Uranium Recovery Facility. On January 20, 2023, during the next periodic inspection of the ventilation duct drain, personnel noted the presence of organic solution, indicating some of the overflowed waste solution had been drawn into the ventilation ductwork.

The initial event assessment determined that the solution had flowed out of the waste tank's overflow line and vent onto the floor, with some solution being drawn into the ventilation system and later identified in the duct drain. The overflow line is one of three IROFS credited in the accident sequence for waste organic solution entering the ventilation ductwork. On February 3, 2023, it was discovered that the overflow line from the Annular Waste Organic Tank contained an intact rupture disc. Liquid could not flow freely through the overflow line due to the obstruction created by the rupture disc. Therefore, the IROFS function of the overflow could not be credited in the accident sequence as documented in the Integrated Safety Analysis. Subsequent to this discovery, BWXT NOG-L Safety and Licensing management determined the event to be reportable in accordance with Appendix A(b)(2) of 10 CFR Part 70. The event was reported on February 3, 2023 within twenty-four hours of determination as EN-56336. The enclosed report provides an event description, background information, assessment of safety significance, identified causes, and an extent of condition review summary.

z:_ E ? 2_

tJf-./SS20 Document transmitted herewith contains OUO markings not applicable (VAfsS Official Use Only Information when QUO enclosure(s) is removed.

People Strong BWXT Nuclear Operations Group, Inc.

P.O. Box 785 Lynchburg. VA 24505 USA INNDVATIDN DRIVEN >

OFFICIAL USE ONLy t:+1.434.522.6000 www.bwxt.com

OFFICIAL USE ONLY If you have questions or require additional information, please contact Daniel Ashworth, Manager of Licensing and Safety Analysis, at dlashworth@bwxt.com or 434-522-5472.

Sincerely, 7U.

Richard J. Freudenberger Manager, Environment, Safety, Health and Safeguards BWXT Nuclear Operations Group, Inc., Lynchburg Enclosure cc: NRC, Region II NRC, Resident Inspector NRC, James Downs, NMSS/DFM People Strong BWXT Nuclear Oper:::i.ticn::. Group, Inc.

P.O. Box 785 Lynchburg, VA 24505 USA , INNDVATIDN DRIVEN>

OFFICIAL USE ONLy 1:+1.434.522.GOOO www. bwxt .com

Official Use Only Official Use Only