05000324/LER-2020-005, (Bsep), Unit 1 Re Condition Prohibited by Technical Specifications Due to Ventilation Charcoal Sample Lab Results
| ML21021A366 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 01/21/2021 |
| From: | Krakuszeski J Duke Energy Progress |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA-20-0388 LER 2020-005-00 | |
| Download: ML21021A366 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 3242020005R00 - NRC Website | |
text
January 21, 2021
~ ~ DUKE
~ ENERGY Serial: RA-20-0388 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
Subject:
Brunswick Steam Electric Plant, Unit Nos. 1 and 2 Renewed Facility Operating License Nos. DPR-71 and DPR-62 Docket Nos. 50-325 and 50-324 Licensee Event Report 1-2020-005 John A. Krakuszeski Vice President Brunswick Nuclear Plant 8470 River Rd SE Southport, NC 28461 o: 910.832.3698 10 CFR 50.73 In accordance with the Code of Federal Regulations, Title 10, Part 50.73, Duke Energy Progress, LLC, is submitting the enclosed Licensee Event Report (LER). This report fulfills the requirement for a written report within sixty (60) days of a reportable occurrence.
This document contains no regulatory commitments.
Please refer any questions regarding this submittal to Ms. Sabrina Salazar, Manager - Nuclear Support Services, at (910) 832-3207.
Sincerely, gA~-~
John A. Krakuszeski SBY/sby
Enclosure:
Licensee Event Report
U.S. Nuclear Regulatory Commission Page 2 of 2 cc (with enclosure):
Ms. Laura Dudes, NRC Regional Administrator, Region II Mr. Andrew Hon, NRC Project Manager Mr. Gale Smith, NRC Senior Resident Inspector Chair - North Carolina Utilities Commission
Abstract
At 14:36 Eastern Standard Time on November 25, 2020, with Unit 1 and 2 in Mode 1 at approximately 100% power, the 2B Control Room Emergency Ventilation (CREV) subsystem was declared inoperable on both units per Unit 1 and Unit 2 Technical Specification (TS) 3.7.3, CREV System, as a result of receiving notification that the 2B charcoal adsorber efficiency laboratory results were below the acceptance criteria. A sample of the 2B CREV charcoal adsorber was sent to a vendor laboratory on November 11, 2020, for analysis as part of the Control Building Emergency Filter System Test.
The failure of the 2B charcoal adsorber to meet acceptance criteria was most likely the result of variations in the charcoal manufacturing process which caused accelerated charcoal surface oxidation. The 2B charcoal filter trays were replaced on November 27, 2020, and the subsystem was returned to operable on November 28, 2020, following completion of operability testing.
There was no impact on the health and safety of the public or plant personnel. The safety significance of this event is minimal. The 2A CREV subsystem remained operable during this time period; only one filtering train is required for system operation with the other serving as the fully redundant standby train.
This event is being reported in accordance with 10 CFR 50.73(a)(2)(i)(B) due to having a condition prohibited by Technical Specifications.
(See Page 3 for required number of digits/characters for each block)
(See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1022/r3/)
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I Page 3 of 3 In addition to the aforementioned completed corrective action, procedure and work order guidance are planned to be updated by June 30, 2021, to include notes and instructions for accelerated sample removal and laboratory test result receipt such that a failure can be corrected, and the unit repaired, within 7 days of the CREV system being initially removed from service.
Any changes to the corrective actions or completion schedules will be made in accordance with the sites corrective action program.
Previous Similar Events
No events have occurred within the past three years in which the CREV charcoal adsorber efficiency laboratory results were below the acceptance criteria.
Commitments
No regulatory commitments are contained in this report.