05000416/LER-2019-001, Automatic Reactor Shutdown Due to Activation of Generator Lockout
| ML19112A058 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 04/22/2019 |
| From: | Emily Larson Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GNRO-2019/00019 LER 2019-001-00 | |
| Download: ML19112A058 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i) |
| 4162019001R00 - NRC Website | |
text
- ~Entergy.
GNR0-2019/00019 April 22, 2019 A TIN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Entergy Operations, Inc.
P.O. Box756 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 2019-001-00, Automatic Reactor Shutdown Due To Activation of Generator Lockout Docket No. 50-416 License No. NPF-29 Attached is Licensee Event Report 2019-001-00, Automatic Reactor Shutdown Due To Activation of Generator Lockout. This report is being submitted in accordance with 10 CFR 50. 73(a)(2)(iv)(A) for an even or condition that resulted in an automatic actuation of the reactor protection system, as specified by 10 CFR 50. 73(a)(2)(iv)(B).
This letter contains no new commitments. If you have any questions or require additional information, please contact Douglas Neve at 601-437-2103.
Sincerely, Cat---
Eric A. Larson EAL/saw
Attachment:
Licensee Event Report 2019-001-00 (See Next Page)
GNR0-2019/00019 Page 2 of 2 cc:
NRC Region IV - Regional Administrator NRC Senior Resident Inspector, Grand Gulf Nuclear Station NRR Project Manager
GNR0-2019/00019 Attachment Licensee Event Report 2019-001-00
NRC FORM 366 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 person is not reauired to respond to the information collection.
- 1. Facility Name
- 12. Docket Number
- 3. Page Grand Gulf Nuclear Station, Unit 1 05000416 1 OF3
- 4. Title Au111111r11;._ f"?-- :~111 ShLJ11:,,.,-,;, n11A To -.-:t= :;:;.L1,-,ij of~.=,*-,.=,,.,:,i" I nr.krnJt
- 5. Event Date
- 6. LER Number
- 7. Report Date
- 8. Other Facilities Involved Sequential Rev Facility Name Docket Number Month Day Year Year Month Day Year N/A Number No.
OSOOON/A 02 23 2019 2019
- - 001
- - 00 04 22 2019 Facility Name Docket Number N/A OSOOON/A
- 9. Operating Mode
- 11. This Report is Submitted Pursuant to the Requirements of 1 O CFR §: (Check all that apply) 1 D 20.2201 (b)
D 20.2203(a)(3)(i)
D 50.73(a)(2)(ii)(A)
D 50.73(a)(2)(viii)(A)
D 20.2201 (d)
D 20.2203(a)(3)(ii)
D 50.73(a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B)
. D 20.2203(a)(1)
D 20.2203(a)(4)
D so.73(a)(2)(iii)
D 50.73(a)(2)(ix)(A)
D 20.2203(a)(2)(i)
D 50.36(c)(1 )(i)(A) 1:81 50.73(a)(2)(iv)(A)
D 50.73(a)(2)(x)
- 10. Power Level D 20.2203(a)(2)(ii)
D 50.36(c)(1 )(ii)(A)
D 50.73(a)(2)(v)(A)
D 73.11(a)(4)
D 20.2203(a)(2)(iii)
D so.36(c)(2) 0'50. 73(a)(2)(v)(B)
D 73. 71 (a)(S) 100 D 20.2203(a)(2)(iv)
D so.46(a)(3)(ii)
D 50.73(a)(2)(v)(C)
D 73.77(a)(1)
D 20.2203(a)(2)(v)
D 50.73(a)(2)(i)(A)
D 50.73(a)(2)(v)(D)
D 73.77(a)(2)(ii)
D 20.2203(a)(2)(vi)
D 50.73(a)(2}(i)(B)
D 50.73(a)(2)(vii)
D 73.77(a)(2)(iii)
D 50.73(a)(2)(i)(C)
D Other (Specify in Abstract below or in
Corrective Actions
YEAR 2019 SEQUENTIAL NUMBER
- - 001 The negative sequence relay set-point was adjusted back to 9 percent and an audible alarm now alerts the control room staff of any of the protective schemes sensing a condition warranting generator protection.
Grand Gulf Design Engineering and key stakeholders reviewed critical components and safety related engineering changes completed during the time period between September 2016 and February 2019 along with pending modifications for extent of cause in the execution of standards.
The cause of the event is not finalized and this section will be supplemented upon completion of the review.
Safety Significance
REV NO.
- - 00 The incorrect set-point resulted in an automatic unplanned Reactor SCRAM as a result of Generator Lockout and Turbine Trip signals. All safety system responded as designed. There were no other actual consequences to safety of the general public, nuclear safety, industrial safety and radiological safety for this event.
Previous Similar Events
Entergy conducted a three year review, as described in NUREG-1022 guidance, and no similar events were revealed.