05000400/LER-2020-001-01, Automatic Reactor Trip During Turbine Control System Digital Electro-Hydraulic System Maintenance
| ML20181A414 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 06/29/2020 |
| From: | Dills J Duke Energy Progress |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA-20-0210 LER 2020-001-01 | |
| Download: ML20181A414 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(x) |
| 4002020001R01 - NRC Website | |
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John R. DIiis Plant Manager Shearon Harris Nuclear Power Plant 5413 Shearon Harris Road New Hill, NC 27562-9300 984.229.2000 10 CFR 50.73 June 29, 2020 Serial: RA-20-021 O ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Shearon Harris Nuclear Power Plant, Unit 1 Docket No. 50-400/Renewed License No. NPF-63 Subject: Licensee Event Report 2020-001-01 Ladies and Gentlemen:
Duke Energy Progress, LLC, submits the enclosed Licensee Event Report (LER) 2020-001-01 in accordance with 10 CFR 50.73 for Shearon Harris Nuclear Power Plant, Unit 1 (HNP). This LER is a supplement to LER 2020-001-00 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20142A454), submitted on May 21, 2020.
On March 23, 2020, an automatic reactor trip occurred fallowing actuation of the Reactor Protection System. All safety systems functioned as expected. The trip occurred during restoration from a planned maintenance evolution impacting the auto-stop turbine trip function of the digital electro-hydraulic system utilized for turbine control. The turbine control system has since been fully restored and the unit restarted. This event had no impact on the health and safety of the public.
There are no regulatory commitments contained within this report.
Please refer any questions regarding_ this submittal to Chuck Varley at (984) 229-2477.
-
Sincerely.
Enclosure: Licensee Event Report 2020-001-01 cc:
J. Zeiler, NRC Senior Resident Inspector, HNP M. Mahoney, NRC Project Manager, HNP NRC Regional Administrator, Region 11
John R. Dills Plant Manager Shearon Harris Nuclear Power Plant 5413 Shearon Harris Road New Hill, NC 27562-9300 984.229.2000 10 CFR 50.73 June 29, 2020 Serial: RA-20-0210 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Shearon Harris Nuclear Power Plant, Unit 1 Docket No. 50-400/Renewed License No. NPF-63 Subject: Licensee Event Report 2020-001-01 Ladies and Gentlemen:
Duke Energy Progress, LLC, submits the enclosed Licensee Event Report (LER) 2020-001-01 in accordance with 10 CFR 50.73 for Shearon Harris Nuclear Power Plant, Unit 1 (HNP). This LER is a supplement to LER 2020-001-00 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20142A454), submitted on May 21, 2020.
On March 23, 2020, an automatic reactor trip occurred following actuation of the Reactor Protection System. All safety systems functioned as expected. The trip occurred during restoration from a planned maintenance evolution impacting the auto-stop turbine trip function of the digital electro-hydraulic system utilized for turbine control. The turbine control system has since been fully restored and the unit restarted. This event had no impact on the health and safety of the public.
There are no regulatory commitments contained within this report.
Please refer any questions regarding this submittal to Chuck Yarley at (984) 229-2477.
Sincerely, John R. Dills Enclosure: Licensee Event Report 2020-001-01 cc:
J. Zeiler, NRC Senior Resident Inspector, HNP M. Mahoney, NRC Project Manager, HNP NRC Regional Administrator, Region II
NRC FORM 366 (04-2020)
U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT (LER)
(See Page 2 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/)
APPROVED BY OMB: NO. 3150-0104 EXPIRES: 04/30/2020
NRC FORM 366 (04-2020) 05000
- 3. Page 1
OF
- 4. Title
- 5. Event Date Month Day Year
- 6. LER Number Year Sequential Number Rev No.
- 7. Report Date Month Day Year
- 8. Other Facilities Involved Facility Name Docket Number 05000 Facility Name Docket Number 05000
- 9. Operating Mode
- 10. Power Level
- 11. This Report is Submitted Pursuant to the Requirements of 10 CFR §: (Check all that apply) 20.2201(b) 20.2201(d) 20.2203(a)(1) 20.2203(a)(2)(i) 20.2203(a)(2)(ii) 20.2203(a)(2)(iii) 20.2203(a)(2)(iv) 20.2203(a)(2)(v) 20.2203(a)(2)(vi) 20.2203(a)(3)(i) 20.2203(a)(3)(ii) 20.2203(a)(4) 50.36(c)(1)(i)(A) 50.36(c)(1)(ii)(A) 50.36(c)(2) 50.46(a)(3)(ii) 50.73(a)(2)(i)(A) 50.73(a)(2)(i)(B) 50.73(a)(2)(i)(C) 50.73(a)(2)(ii)(A) 50.73(a)(2)(ii)(B) 50.73(a)(2)(iii) 50.73(a)(2)(iv)(A) 50.73(a)(2)(v)(A) 50.73(a)(2)(v)(B) 50.73(a)(2)(v)(C) 50.73(a)(2)(v)(D) 50.73(a)(2)(vii) 50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B) 50.73(a)(2)(ix)(A) 50.73(a)(2)(x) 73.71(a)(4) 73.71(a)(5) 73.77(a)(1) 73.77(a)(2)(i) 73.77(a)(2)(ii)
Other (Specify in Abstract below or in Page of 05000-
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
D. Corrective Actions
The TCS has been restored and the reactor is back online. The restoration sequence contained within the Quadvoter replacement procedure will be revised to use a sequence that will not result in a significant AST header pressure change.
E. Safety Analysis
The reactor trip is considered a normal scram and was not accompanied by complications. Main Feedwater was available throughout the event and was quickly restored as the steam generator's feed source after the reactor trip. All Engineered Safety Features [B] and Reactor Protection Systems [J] functioned as designed. No loss of reactor coolant system (RCS)
[AB] inventory or excessive RCS cooldown occurred. Pressurizer [PZR] safety valves [RV] did not actuate. Thus, this event is low risk significant per Probabilistic Risk Assessment analysis. This event had no impact on the health and safety of the public.
F. Additional Information
There have been no events similar to those documented in this LER in the past three years. There have been two other LERs and one LER supplement submitted in the past three years due to a loss of Quadvoter function. These include LER 2018-003-00, submitted August 30, 2018, LER 2019-001-00, submitted June 17, 2019, and LER 2019-001-01, submitted September 16, 2019. However, these LERs document a loss of safety function as a result of AST Quadvoter SOVs unable to cycle. All solenoids were able to operate as designed to trip the reactor during the reactor trip on March 23, 2020.
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