05000338/LER-2018-002, 1J Emergency Diesel Generator Auto-Start
| ML18303A289 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/23/2018 |
| From: | Lane N Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 18-361 LER 2018-002-00 | |
| Download: ML18303A289 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 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)(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)(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)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i) |
| 3382018002R00 - NRC Website | |
text
10CFR50.73 Virginia Electric and Power Company North Anna power *station 1022 Haley Drive Mineral, Virginia 23117 October 23, 2018 Attention: Document Control Desk Serial No.:
18-361 U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
Dear Sirs:
NAPS:
RAP Docket Nos.: 50-338 License Nos:: NPF-4 Pursuant to 10CFR50.73, Virginia Electric and Power Company hereby submits the
- - following Licensee Event Report applicable to North Anna Power Station Unit 1.
Report No. 50-338/2018-002-00 This report has been reviewed by the Facility Safety Review Committee and will be forwarded to the Management Safety Review Committee for its review.
Sincerely, 11 R"j-~
N. Larry Lane Site Vice President North Anna Power Station Enclosure Commitments contained in this letter: None cc:
United States Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, Georgia 30303-1257 NRC Senior Resident lnspectqr North Anna Power Station
NRC FORM 366 (11-2015)
U.S. NUCLEAR REGULATORY COMMISSlm APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 1013112018 LICENSEE EVENT REPORT (LER)
(See Page 2 for required number of digits/characters for each block)
Estimated burden per response to comply with this mandatory collection request: 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />.
Reported lessons learned are incorporated into the licensing process and fed back to industry.
Send comments regarding burden estimate to the FOIA, Privacy and Information Collections Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to lnfocollects.Resource.@nrc.gov, and to the Desk Officer, Office of Information an.d Regulatory Affairs, NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information collection does not display a currently valid 0MB control number, the NRG may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 1. FACILITY NAME North Anna Power Station, Unit 1
- 4. TITLE 1 J Emergency Diesel Generator Auto-Start
- 2. DOCKET NUMBER 05000338
- 3. PAGE 1 OF 3
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR I SEQUENTIAL I REV MONTH NUMBER NO.
09 03 2018 2018
- 002
- 00 10 DAY YEAR 23 2018 FACILITY NAME FACILITY NAME DOCKET NUMBER 05000 DOCKET NUMBER 05000
- 9. OPERA TING MODE.
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
D 20.2201 (b)
D 20.2203(a)(3)(i)
D 50.73(a)(2)(ii)(A)
D 50,73(a)(2)(viii)(A) 1 D 20.2201 (dl D 20.2203(a)(3l(iil D 50.73(a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B)
D 20.2203(a)<1 l D 20.2203(a)(4l D 50.13(a)(2)(iiil D 50.73(a)(2)(ix)(A)
D 20.2203(a)(2l(il D 50.36(c)(1 )(i)(A)
[8l 50.73(a)(2)(iv)(A)
D 50.73(a)(2)(x)
- 10. POWER LEVEL D 20.2203(a)(2)(iil D 50.36(c)(1 )(ii)(A)
D 50.73(a)(2)(v)(A)
D 13.11ca)(4l D 20.2203(a)(2)(iiil D 5o.36(c)(2)
D 50.73(a)(2)(v)(B)
- D 13.11ca)(5l D 20.2203(a)(2)(iv)
D 5o.46(a)(3l(iil D 50.73(a)(2)(v)(C)
D 13.11(a)(1)
D 20.2203(a)(2)(v)
D 50.73(a)(2)(i)(A)
D 50. 73(a)(2)(v)(D)
D 13.11(a)(2)(il 100 D 20.2203(a)(2)(vi)
D 50.73(a)(2)(i)(B)
D 50.73(a)(2)(vii)
D 13.11(a)(2)(iil D 50.73(a)(2)(i)(C)
D OTHER Specify in_ Abstract below or in 1.0 DESCRIPTION OF THE EVENT On 9/3/2018 at approximately 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br /> the 1 J emergency bus (EIIS System - EA) de-energized and
- the 1 J Emergency Diesel Generator (EOG) (EIIS System -
EK, Component - OG) auto-started as a result of a loss of th~ "A" Reserve Station Service Transformer (RSST) (EIIS System -
EA, Component - XFMR). The loss of the "A" RSST was due to a bird strike on the "C" Phase Lightning Arrestor which caused a fault on the "C" phase on the High Side (34.5kV) of the transformer. The auto start of the 1 J EOG is a valid System Actuation and is reportable in accordance with 10 CFR 50.73(a)(2)(iv)(A).
Also, as a result of this event, the Unit 1 "A" Charging pump (EIIS System -
CB, Component - P) auto-started due to logic associated with the loss of the 1 J emergency bus. The pump was secured shortly after the 1 J EOG was aligned as the sole power source for the 1 J emergency bus.
2.0 SIGNIFICANT SAFETY CONSEQUENCES AND IMPLICATIONS
No significant safety. consequences resulted from this. event because the 1J EOG responded as designed to power the 1 J emergency bus within 10 seconds of the loss of power. The 1 J emergency bus was aligned to an additional offsite power source at approximately 1140 hours0.0132 days <br />0.317 hours <br />0.00188 weeks <br />4.3377e-4 months <br /> on 9/3/2018 and the 1J EOG was secured at 1144 hours0.0132 days <br />0.318 hours <br />0.00189 weeks <br />4.35292e-4 months <br />. The health and safety of the public were not affected by this event.
3.0 CAUSE
The direct cause of the loss of the "A" RSST is a bird strike on the "C" Phase Lightning Arrestor.
4.0 IMMEDIATE CORRECTIVE ACTION(Sl The lightning a~restor was damaged as a result of the bird strike and was replaced prior to return!ng the transformer to service.
Page 3 of 3 (11-2015)
U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET North Anna Power Station, Unit 1 05000338 YEAR
- 6. LER NUMBER SEQUENTIAL NUMBER REV NO.
2018 001 00
~.O ADDITIONAL CORRECTIVE ACTIONS.
The "A" RSST is being replaced under a previously planned design change. As part of that design change, animal guards are being installed to mitigate future animal intrusion vulnerabilities.
6.0 ACTIONS TO PREVENT RECURRENCE The "B" and "C" RSSTs are scheduled to be replaced as part of previously planned design changes. These RSSTs will also have animal. guards installed to mitigate future animal intrusion vulnerabilities.
7.0 SIMILAR EVENTS A similar event related to an animal contact in the North Arina switchyard was reported in LER N1 -:2016-003-00.
8.0 MANUFACTURER/MODEL NUMBER N/A
9.0 ADDITIONAL INFORMATION
Unit 2 continued operating at 100 percent power, mode 1, during this event.