05000338/LER-2020-001-01, For North Anna Power Station, Unit 1, Degraded Upper Cylinder Piston Pin Bushing Discovered During Maintenance Activities on Emergency Diesel Generator
| ML20122A056 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/21/2020 |
| From: | Lane N Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 20-141 LER 2020-001-01 | |
| Download: ML20122A056 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 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)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i) |
| 3382020001R01 - NRC Website | |
text
10CFR50.73 Virginia Electric and Power Company North Anna Power Station 1022 Haley Drive Mineral, Virginia 23117 April 21, 2020 Attention: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
Dear Sir or Madam:
Serial No.:
20-141 NAPS:
CVNV 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.
This revision corrects an error in the original submission for the equipment's return to service date.
Report No. 50-338/2020-001-01 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, f"J.P~&
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 Inspector North Anna Power Station
NRC FORM 366 U.S. NUCLEAR REGULATORYCOMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 04/30/2020 (04-2020) 3.Page North Anna Power Station Unit 1 05000 338 1
OF 3
- 4. Title Degraded Upper Cylinder Piston Pin Bushing Discovered during Maintenance Activities on Emergency Diesel Generator
- 5. Event Date
- 6. LER Number
- 7. Report Date
- 8. Other Facilities Involved Month Day Year Year I Sequential I Rev Month Day Year Facility Name Docket Number Number No.
05000 02 18 2020 2020*
001*
Facility Name Docket Number 01 04 21 2020 05000
- 9. Operating 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)
D 20.2201(d)
- o 20.2203(a)(3)(ii)
D 50. 73(a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B) 1 D 20.2203(a)(1)
D 20.2203(a)(4)
D 50.73(a)(2)(iii)
D 50.73(a)(2)(ix)(A)
D 20.2203(a)(2)(i)
D 50.36(c)(1 )(i)(A)
D 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 73.71(a)(4)
D 20.2203(a)(2)(iii)
D 50.36(c)(2)
D 50.73(a)(2)(v)(B)
D 73.71 (a)(5)
D 20.2203(a)(2)(iv)
D 50.46(a)(3)(ii)
D 50. 73(a)(2)(v)(C)
D 73. 77(a)(1) 100 D 20.2203(a)(2)(v)
D 50. 73(a)(2)(i)(A) 050. 73(a)(2)(v)(D)
D 73. 77(a)(2)(i)
D 20.2203(a)(2)(vi) 050. 73(a)(2)(i)(B)
D 50.73(a)(2)(vii)
D 73. 77(a)(2)(ii)
.. D 50.73(a)(2)(i)(C)
D Other (Specify in Abstract below or in 4,o lwmedjate Corrective Actjon YEAR 2020
- SEQUENTIAL NUMBER 001 Subsequent maintenance activities and inspections were performed on 1J EOG number 1 lower piston and the upper piston pin bushings for number 2, number 3, and number 8 with no indication of abnormal wear or degradation.
s,o Additiooal Corrective Actjons The short term corrective actions include:
REV NO.
01
- 1. Engineering will review and modify the elemental analysis wear metal criteria for the EDG lubricating oil to establish a more conservative criterion than vendor recommended thresholds.
- 2. Engineering will present the findings of this event to the Fairbanks Morse Diesel Owners Group for consideration and development of a more conservative elemental wear metal analysis for the Fairbanks Morse Opposed Piston diesel engines in nuclear service.
- 3. Organizational and programmatic analysis review will occur as this event has identified an over reliance on vendor supplied monitoring criteria, specifically related to oil analysis.
s,o Actions to prevent Recurrence Engineering will review and modify elemental analysis wear metal criteria for the EOG lubricating oil establishing a more conservative criterion than vendor recommended thresholds. Lessons learned from this event identified by over reliance on vendor supplied monitoring criteria will be included in leadership training.
z,o Similar Eyents This event is an isolated occurrence therefore no similar events have been reported.
a,o Additiooal lotormatjon
Description
01-EE-EG-1J, 1J Emergency Diesel Generator Manufacturer: Fairbanks Morse Model No.: 38TD8-1/8 NRG FORM 366 (04-2020)