05000416/LER-2019-006, Failure to Meet Technical Specification 5.5.7 for Division II Standby Gas Charcoal Filter Media Efficiency
| ML19322C805 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 11/18/2019 |
| From: | Emily Larson Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GNR0-2019/00048 LER 2019-006-00 | |
| Download: ML19322C805 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 4162019006R00 - NRC Website | |
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-=~ n ergy GNR0-2019/00048 November 18, 2019 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Entergy Operations, Inc.
P.O. Box 756 Port Gibson, Mississippi 39150 Eric A. Larson Site Vice President Grand Gulf Nuclear Station Tel: 601-437-7500 10 CFR 50.73
SUBJECT:
Grand Gulf Nuclear Station, Unit 1 Licensee Event Report 2019-006-00, Failure to meet Technical Specification 5.5. 7 for B Train Standby Gas C,harcoal Filter Media Efficiency.
NRC Docket No. 50-416 Renewed Facility Operating License No. NPF-29
. Attached is Licensee Event Report 2019-006-00, 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.
This letter contains no new commitments. If you have any questions or require additional information, please contact Jim Shaw at 601-437-2103.
Sincerely,
~' 4 ez_.4A~
Eric A. Larson EAUfas
Attachment:
Licensee Event Report 2019-006-00
GNR0-20.19/00048 Page 2 of 2 cc:
NRC Region IV - Regional Administrator NRC Senior Resident Inspector, Grand Gulf Nuclear Station NRR Project Manager
GNR0-2019/00048 Attachment Licensee Event Report 2019-006-00
NRCFORM366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 03/31/2020 (04-2018)
, the NRC may not conduct or sponsor; and a oerson is not reauired to resoond to the information collection.
- 1. Facility Name
- 2. Docket Number 3.Page Grand Gulf Nuclear Station, Unit 1 05000 416 1 OF3
- 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.
Sequential Rev Facility Name Docket Number Month Day Year Year Number No.
Month Day Year N/A 05000 N/A 09 20 2019 2019
- - 006
- - 00 11 18 2019 Facility Name Docket Number N/A 0500() NIA
- 9. Operating Mode NA NA NA Abstract (Limit to 1400 spaces, i.e., approximately 14 single-spaced typewritten lines)
On September 20, 2019, Division II Standby Gas Treatment System (SBGn was declared inoperable due to the failure to restore Division II SBGT to OPERABLE within the Limiting Condition for Operation (LCO) 3.6.4.3 seven (7) day action completion time.
Test results from the Division II SBGT charcoal filter did not meet the acceptance criteria in Technical Specification (TS) 5.5.7, Ventilation Filter Testing Program (VFTP). The test results were received on September 20, 2019 at 5:14 pm. The charcoal filter sample was obtained on September 4, 2019 at 2:38 am CDT. The charcoal media was considered deficient starting from the September 4, 2019 date of sample, to the discovery date of September 20, 2019, when the results were received. This deficiency placed the station in a condition that is prohibited by TS 3.6.4.3. Upon receipt of the charcoal filter results on September 20, 2019 the station entered TS 3.6.4.3. On September 22, 2019 at 10:05 pm, the charcoal bank was replaced. All testing and acceptance criteria were met, and TS 3.6.4.3 LCO was met on September 23, at 1 :41 am.
The cause of the failure not being detected beforehand was contributed to inadequate monitoring and inadequate identification of adverse trends.
This report is made pursuant to 1 O CFR 50. 73(a)(2)(i)(B) for any operation or condition which was prohibited by the plant's Technical Specification.
There were no consequences to the general safety of the public, nuclear safety, industrial safety and radiological safety for this event.
NRC FORM 366 (04-2018)
Plant Conditions
Grand Gulf Nuclear Station (GGNS) Unit 1 was operating at approximately 100 percent power in MODE 1. There were no structures, systems, or components that were inoperable that contributed to the event.
Description
On September 20, 2019, test results were received indicating that a sample from the Division II charcoal filter of the Standby Gas Treatment System (SBGT)[VVF] had an efficiency of 98.90 percent which did not meet the Acceptance Criteria (greater than or equal to 99.5 percent) listed in Technical Specification (TS) 5.5.7, Ventilation Filter Testing Program (VFTP). The charcoal filter sample was obtained on September 4, 2019 at 2:38 am CDT. The charcoal media was considered deficient starting from the September 4, 2019 date of sample, to the discovery date of September 20, 2019, when the results were received: As a result, this deficiency placed the station in a condition that is prohibited by TS Limiting Condition for Operation (LCO) 3.6.4.3 Standby Gas Treatment System. Upon receipt of the charcoal filter results on September 20, 2019 the station entered TS 3.6.4.3 Condition A On September 22, 2019 at 10:05 pm, the charcoal bank was replaced. All testing, leak tests and Dioctyl-phthalate (DOP) testing were completed verifying that all Acceptance Criteria were met. TS 3.6.4.3 Condition A was exited on September 23, 1 :41 am.
The failed sample was obtained from the SBGT charcoal filter on September 4, 2019 at 2:38 am CDT and it was not replaced until September 22, 2019 at 10:05 pm. This exceeded the seven (7) day Completion Time for the SGTS listed in TS LCO 3.6.4.3 Condition A which placed the station in a condition prohibited by Technical Specifications.
Reportability
This event is reportable under 1 O CFR 50. 73( a)(2)(i)(B), Any operation or condition which was prohibited by the plant's Technical Specification.
Direct Cause:
The Direct Cause is failure of the charcoal filter media.
Causal Factors:
The failure was not detected beforehand because of inadequate monitoring and inadequate identification of adverse trends.
Immediate Corrective Actions
The charcoal filter was replaced and tested to verify the acceptance criteria was met.
Corrective Actions
Established a trend in the System Notebook folder. Revising the model Work Order procedure, and include the trend in the System PM P.
. NRC FORM 3668 (02-2018)
Page.2 of 3 (04-2018)
U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB:. NO. 3150-0104 EXPIRES:'. 3/31/2020 LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET (See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.gov/reading-rrn/doc-collections/nuregs/staff/sr1022/r31)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. LERNUMBER YEAR Grand Gulf Nuclear Station, Unit 1 05000-416 2019
Safety Significance
SEQUENTIAL
'NUMBER
- - 006 REV NO.
- - 00 The function of the SBGT system is to ensure that radioactive materials that leak from the primary containment into the secondary containment following a Design Basis Accident (OBA) are filtered and adsorbed prior to exhausting to the environment (T.S. Bases 3.6.4.3). This failure was limited to the Division II SBGT. Each train is capable of treating 100 percent of the Auxiliary Building volume. Division I SBGT was OPERABLE and AVAILABLE during this event. The capability of Division 11 SBGT was independent of the power level or operating ~ode of the plant at that particular time.
Therefore, there were no actual consequences to safety as a result of this event.
Previous Similar Event:
A five-year review of similar events was conducted, and no similar events were revealed. Page 3 of 3