05000416/LER-2019-006-01, Failure to Meet Technical Specification 5.5.7 for B Train Standby Gas Charcoal Filter Media Efficiency
| ML21049A273 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  (NPF-029) |
| Issue date: | 02/18/2021 |
| From: | Franssen R Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GNRO-2021/00006 LER 2019-006-01 | |
| Download: ML21049A273 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 4162019006R01 - NRC Website | |
text
GNRO-2021/00006 February 18, 2021 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
SUBJECT:
Grand Gulf Nuclear Station, Unit 1 Supplemental Licensee Event Report 2019-006-01, Failure to meet Technical Specification 5.5.7 for B Train Standby Gas Charcoal Filter Media Efficiency.
Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 Renewed License No. NPF-29 Attached is Supplemental Licensee Event Report 2019-006-01, Failure to meet Technical Specification 5.5.7 for B Train Standby Gas Charcoal Filter Media Efficiency. This report is being submitted in accordance with 10 CFR 50.73(a)(2)(i)(B), for any Operation or Condition Prohibited by Technical Specifications and a condition that could have prevented the fulfillment of a safety function, pursuant to 10 CFR 50.73(a)(2)(v)(C).
This letter contains no new Regulatory Commitments. Should you have any questions concerning the content of this letter, please contact Jeff Hardy, Manager Regulatory Assurance at 269-764-2011.
Sincerely, Robert Franssen RF/fas Attachments: Licensee Event Report 2019-006-01 Robert Franssen Site Vice President Grand Gulf Nuclear Station Tel: 601-437-7500 Entergy Operations, Inc.
P.O. Box 756 Port Gibson, Mississippi 39150 10 CFR 50.73
GNRO-2021/00006 Page 2 of 3 cc:
NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150 U.S Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
GNRO-2021/00006 Page 3 of 3 Attachment Licensee Event Report 2019-006-01
NRC FORM 366 (08-2020)
U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08/31/2023 LICENSEE EVENT REPORT (LER)
(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/)
- 1. Facility Name Grand Gulf Nuclear Station, Unit 1
- 2. Docket Number 05000416
- 3. Page 1 OF 3
- 4. Title Failure to meet Technical Specifications 5.5.7 for Division II Standby Gas Charcoal Filter Media Efficiency
- 5. Event Date
- 6. LER Number
- 7. Report Date
- 8. Other Facilities Involved Month Day Year Year Sequential Number Rev No.
Month Day Year Facility Name N/A Docket Number 05000 N/A 09 20 2019 2019 - 006 -
01 02 18 2021 Facility Name Docket Number N/A 05000 N/A
- 9. Operating Mode
- 10. Power Level 1
100 Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocollects.Resource@nrc.gov, and the OMB reviewer at: OMB Office of Information and Regulatory Affairs, (3150-0104), Attn: Desk Officer for the Nuclear Regulatory Commission, 725 17th Street NW, Washington, DC 20503; e-mail: oira_submission@omb.eop.gov. The NRC may not conduct or sponsor, and a person is not required to respond to, a collection of information unless the document requesting or requiring the collection displays a currently valid OMB control number.
LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET (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/)
- 3. LER NUMBER Grand Gulf Nuclear Station, Unit 1 05000-416 YEAR SEQUENTIAL NUMBER REV NO.
2019
- - 006
- - 01
Immediate Corrective Actions
The charcoal filter was replaced and tested to verify the acceptance criteria was met.
Corrective Actions
System engineering established trending of charcoal sample and performance in the System Notebook. Included trending in the System PMP. Performance Monitoring Plan was revised to address both Divisions I and II.
Revised the SBGT Work Order (WO) procedures for Division I and II. The revised procedures to provide for the generation of a CR when the charcoal sample results exceed the Alert limit.
Revised the Control of Limiting Conditions for Operation procedure (02-S-01-17) to strengthen LCO tracking. Added Section 6.21 - Material Sampling of Technical Specification Required Systems, for avoiding a loss of safety function while TS related materials are being sampled and tested off site.
Safety Assessment
There were no actual consequences for this event. There was no radiological release from the Secondary Containment as a result of this event. There were no other actual consequences to safety of the general public, nuclear safety, industrial safety and radiological safety.
SBGT Division I quarterly surveillance test was planned, scheduled and performed using an approved procedure. This procedure directed the declaration of inoperability and included appropriate procedural steps for immediate restoration of SBGT Division I in the event of a condition requiring system initiation and actuation. The surveillance was performed to demonstrate operability of the system as required by TS. The SBGT Division I was operable before the 11-minute test and operable after the 11-minute test, with no abnormalities noted during the test. Previous successful tests and subsequent successful tests support that SBGT Division I did not show any indication of degradation.
Although a kill switch was used during the testing of the standby gas treatment SBGT system valve test, the established procedural controls ensure the system would be able to meet its safety function if required. Therefore, in accordance with NEI 99-02, Regulatory Assessment Performance Indicator Guideline, this event is not being counted as a loss of safety function for performance indicator purposes.
Previous Similar Events
None.