05000280/LER-2018-003, Regarding Auto-Start of Emergency Diesel Generators Due to Pilot Wire Lockout on C Reserve Station Service Transformer
| ML19016A133 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 01/08/2019 |
| From: | Mladen F Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 19-001 LER 2018-003-00 | |
| Download: ML19016A133 (4) | |
| 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)(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) |
| 2802018003R00 - NRC Website | |
text
JAN O 8 2019 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555-0001
Dear Sir or Madam:
10CFR50.73 Virginia Electric and Power Company Surry Power Station 5570 Hog Island Road Surry, Virginia 23883 Serial No.:
SPS:
Docket No.:
19-001 TSC 50-280 50-281 License No.: DPR-32 DPR-37 Pursuant to 10CFR50.73, Virginia Electric and Power Company hereby submits the following Licensee Event Report applicable to Surry Power Station Unit 1 and Unit 2.
Report No. 50-280, 50-281 / 2018-003-00 This report has been reviewed by the Station Facility Safety Review Committee and will be forwarded to the Management Safety Review Committee.
Enclosure Commitment contained in this letter: None Very truly yours, F. Mladen Site Vice President Surry Power Station cc:
U.S. Nuclear Regulatory Commission, Region II Marquis One Tower, Suite 1200 245 Peachtree Center Ave., NE Atlanta, GA 30303-1257
- NRG Senior Resident Inspector Surry Power Station
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150*0104 EXPIRES: 03/31/2020 (04-2017)
- ,#"'"o",,..,.
{
LICENSEE t=VENT REPORT (LER)
\\,
- f (See Page 2 for required number of digits/characters for each block) the NRG may not conduct or sponsor, and a person is not required to respond to, the information collection.
(See NUREG-1022, R.3 for instruction and guidance for completing this form b1tQ://www.nrc.goy/rec1_ding-rm/doc-collections/nuregs/staff/sr1022/r3D
- 3. PAGE Surry Power Station, Unit 1 05000 280 1 OF 3
- 4. TITLE Auto-Start of Emergency Diesel Generators due to Pilot Wire Lockout on 'C' Reserve Station Service Transformer
- 5. EVENT DATE MONTH DAY YEAR 11 12 2018
- 9. OPERA TING MODE N
- 10. POWER LEVEL 100 LICENSEE CONTACT Barry Garber
CAUSE
B SYSTEM EA
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED I
SEQUENTIAL I REV FACILITY NAME DOCKET NUMBER YEAR NUMBER NO.
MONTH DAY YEAR Surry Power Station, Unit 2 05000 281 FACILiTY NAME DOCKET NUMBER 2018.
003. 00 01 11 2019 05000.
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 0 20.2201(b)
D 20.2203(a)(3)(i)
O 50.73(a)(2)(ii)(A) 0 50.73(a)(2)(viii)(A)
D 20.2201(d)
D 20.2203(a)(3)(ii)
O 50.73(a)(2)(ii)(B)
- D 50.73(a)(2)(viii)(B) o 20.2203(a)(1)
D 20.2203(a)(4) o so.73(a)(2)(iii) 0 50.73(a)(2)(ix)(A) o 20.2203(a)(2)(i)
D 50.36(c)(1)(i)(A)
[Z] 50.73(a)(2)(iv)(A) 0 50.73(a)(2)(x)
D 2ci.2203(a)(2)(ii)
D 50.36(c)(1)(ii)(A) 0 50.73(a)(2)(v)(A) o 73.71(a)(4) o 20.2203(a)(2)(iii)
D so.36(c)(2) 0 50.73(a)(2)(v)(B)
D 13.11(a)(5) 0 20.2203(a)(2)(iv)
D so.46(a)(3)(ii) 0 50.73(a)(2)(v)(C)
D 73.77(a)(1) 0 20.2203(a)(2)(v)
D 50.73(a)(2)(i)(A)
- 0 50.73(a)(2)(v)(D) o 73.77(a)(2)(i)
D 20.2203(a)(2)(vi)
D 50.73(a)(2)(i)(B)
. D 50.73(a)(2)(vii)
D 73.77(a)(2)(ii)
[i~L.:iii~):,:*H{.:,11: :*
D 50.73(a)(2)(i)(C)
D OTHER Specify in Abstract below or in
- 3. 0 CAUSE OF THE EVENT YEAR 2018
- SEQUENTIAL NUMBER 003 REV NO.
00 A fault on the underground primary feeder cable to 'C' RSST caused the pilot wire lockout actuation and subsequent isolation of power to the 1 'H' and 2'J' emergency busses. The fault occurred at a cable splice location that was overstressed during switching operations. The splice was fully functional while energized at steady state, but was vulnerable when initially energized. A failure evaluation is ongoing, but the preliminary cause of failure is workmanship in the surface preparation of the splice connection which was made in 2009. The failed components were not associated with 'C' RSST replacement activities.
1
4.0 IMMEDIATE CORRECTIVE ACTIONS
Testing was performed on all 34.5 KV cables which supply the 'C' RSST. Faulty splice connectors were repaired prior to returning the 'C' RSST to service.
5.0 ADDITIONAL CORRECTIVE ACTIONS
'A' and 'B' RSSTs supply the primary source of off-site power to the 1 'J' and 2'H' emergency busses, respectively. The cables which feed the 'A' and 'B' RSSTs have shorter underground cable runs than 'C' RSST. Only 'C' and 'A' RSST feeders have underground cable splices. Cables associated with 'A' and 'B' RSSTs will be Tan Delta tested at their next transformer outage opportunity.
6.0 ACTIONS TO PREVENT RECURRENCE Long term actions recommended by the cause evaluation will be tracked by the corrective action program.
7.0 SIMILAR EVENTS
Surry LER 1999-007-00, Undervoltage Actuation Due to a Loss of Reserve Station Service Transformer 8.0 MANUFACTURER/MODEL NUMBER 3M / silicon body cold shrink splice
9.0 ADDITIONAL INFORMATION
While #1 and #3 EDGs were loaded on the 1'H' and 2'J' 4160 V emergency busses, Technical Specification (TS) action statements associated with Unit 1 and Unit 2 emergency electrical systems were reviewed, and associated TS clocks were entered. The event did not cause any additional reportable condition.
There were no other structures, systems, or components that were inoperable at the start of the event that contributed to the event. Page 3
of 3