05000395/LER-2019-003, Completion of a Technical Specification Required Plant Shutdown
| ML20006D942 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 01/03/2020 |
| From: | Lippard G Dominion Energy South Carolina |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 19-516, VCS-LIC/HK R0 LER 2019-003-00 | |
| Download: ML20006D942 (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)(iii) 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)(i) |
| 3952019003R00 - NRC Website | |
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V. C. Summer Nuclear Station Bradh*am Blvd & Hwy 215, Jenkinsville, SC 29065 Mailing Address:
P.O. Box 88, Jenkinsville, SC 29065 Dominion Energy.com January 3, 2020 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 DOMINION ENERGY SOUTH CAROLINA (DESC)
P Dominion
- rll Energy Serial No.
- 19-516 VCS-LIC/HK RO Docket No. 50-395 License No. NPF-12 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1 LICENSEE EVENT REPORT 2019-003-00 COMPLETION OF A TECHNICAL SPECIFICATION REQUIRED PLANT SHUTDOWN Dominion Energy South Carolina hereby submits Licensee Event Report (LER) 2019-003-00, for VCSNS. This report provides details concerning the completion of a Technical Specification Required Plant Shutdown. This report is submitted in accordance with 10 CFR 50. 73(a)(2)(i)(A).
A Failure Mode Analysis and Root Cause Evaluation are being performed. A supplemental LER will be submitted to provide the results of these investigations.
Should you have any questions, please call Mr. Michael Moore at (803) 345-4752.
George A. Lippard Site Vice President V.C. Summer Nuclear Station Enclosure Commitments contained in this letter: None cc:
G. J. Lindamood - Santee Cooper L. Dudes - NRC Region II S. A. Williams - NRC Project Mgr.
NRC Resident Inspector J. N. Bassett-INPO Marsh USA, Inc.
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 03/31/2020 (04-201 8)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
3.Page V. C. Summer Nuclear Station, Unit 1 05000 395 1
OF 3
- 4. Title Completion of a Technical Specification Required Plant Shutdown
- 5. Event Date
- 6. LER Number
- 7. Report Date
- 8. Other Facilities Involved Month Day Year I
Sequential I Rev Facility Name Docket Number Year Number No.
Month Day Year 05000 11 07 2019 Facility Name Docket Number 2019 -
003 -
00 01 03 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)
D 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) 1 O. 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) 0 50. 73(a)(2)(i)(A)
D 50.73(a)(2)(v)(D)
D 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)
D 50.73(a)(2)(i)(C)
D Other (Specify in Abstract below or in
3.0 CAUSE OF THE EVENT
An FMA and RCA are currently being performed. The event occurred due to blade cracking which led to catastrophic failure. The cause of the blade cracking is under investigation.
4.0 IMMEDIATE CORRECTIVE ACTIONS
The damaged XAA0002A RBCU cooling coil was isolated by closing and removing power from the inlet and outlet SW System valves. All RBCU fan blades for the three operational fans were replaced and the fan assemblies were balanced.
The damaged blades have been sent to a materials analysis laboratory for failure analysis to support development of corrective actions to prevent recurrence.
5.0 ADDITIONAL CORRECTIVE ACTIONS
A temporary repair was made by crimping and soldering the end of the ruptured XAA0002A RBCU cooling coils. The RBCU was removed from service and the inlet and outlet isolation valves, XVG03108B-SW and XVG03109B-SW, were closed. Power was removed from the valves to prevent inadvertent operation.
A repair plan is being developed to determine the most prudent method to restore the cooling coil function as well as the repair of both XAA0002A RBCU fan motors (MFN0096C and MFN0097C) and the XAA0002A RBCU fan (XFN0065A).
Repairs are scheduled for the upcoming 2020 spring outage.
6.0 ACTIONS TO PREVENT RECURRENCE Actions to prevent recurrence are under development. The FMA and RCA will determine the causes and specific corrective actions will be developed.
7.0 SIMILAR EVENTS
None 8.0 MANUFACTURER/MODEL NUMBER The RBCU fans (XFN0064A and XFN0065A) are Joy Axivane Containment Cooling Fans and were procured by the vendor American Air Filter Co. Inc. and manufactured by Joy Mfg. Co.
9.0 ADDITIONAL INFORMATION
None Page 3
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