05000400/LER-2022-008, Automatic Actuation of Auxiliary Feedwater System
| ML22353A591 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/19/2022 |
| From: | Gunter W Duke Energy Progress |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| RA-22-0340 LER 2022-008-00 | |
| Download: ML22353A591 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation |
| 4002022008R00 - NRC Website | |
text
£ ~ DUKE
~ ENERGY~
William Gunter Nuclear Support Services Manager Shearon Harris Nuclear Power Plant 5413 Shearon Harris Road New Hill, NC 27562-9300 10 CFR 50.73 December 19, 2022 Serial: RA-22-0340 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 2022-008-00 Ladies and Gentlemen:
Duke Energy Progress, LLC, submits the enclosed Licensee Event Report 2022-008-00 in accordance with 10 CFR 50. 73 for Shearon Harris Nuclear Power Plant, Unit 1 (HNP). This report describes a condition associated with the automatic actuation of the auxiliary feedwater system following an attempt to start the 'B' main feedwater pump. This event had no significance with respect to the health and safety of the public.
There are no regulatory commitments contained within this report.
Please refer any questions regarding this submittal to Sarah McDaniel at (984) 229-2002.
Sincerely, William Gunter Enclosure: Licensee Event Report 2022-008-00 cc:
P. Boguszewski, NRC Senior Resident Inspector, HNP M. Mahoney, NRC Project Manager, HNP NRC Regional Administrator, Region II
Abstract
Shearon Harris Nuclear Power Plant, Unit 1 400 3
Automatic Actuation of Auxiliary Feedwater System 10 30 2022 2022 008 00 12 19 2022 3
000
Sarah McDaniel, Regulatory Affairs Engineer (984) 229-2002 X
SJ 33 N007 Y
On October 30, 2022, at 20:57 Eastern Daylight Time, Shearon Harris Nuclear Power Plant, Unit 1 (HNP), was in Mode 3 at 0%
power. An automatic actuation of the auxiliary feedwater (AFW) system occurred during an attempt to start the B main feedwater pump (MFP). Prior to the event, the A MFP was removed from service due to its power supply, the A electrical auxiliary bus, being under clearance. The B MFP switch was taken to start and the B MFP breaker did not close, which resulted in a valid AFW system actuation signal for loss of the last running MFP. The A and B motor-driven AFW (MDAFW) pumps were in service for steam generator inventory control prior to the AFW system actuation and remained in service following the event. The MDAFW flow control valves (FCVs) automatically opened as designed when the AFW actuation signal was received. Operations took action to control the AFW flow rate by throttling the FCVs. This event is being reported in accordance with 10 CFR 50.73(a)(2)(iv)(A) as an event that resulted in an automatic actuation of the AFW system. The AFW system responded to plant conditions as designed. The cause of the B MFP failure to start was an open limit switch alignment deficiency on the B MFP recirculation line condenser isolation valve. Misalignment of the limit switch prevented meeting the start permissive for the B MFP. The limit switch on the B MFP recirculation line condenser isolation valve was adjusted to obtain proper alignment. Procedural guidance will be revised to require start permissive verification checks prior to starting a MFP. This event did not impact public health and safety.Page of 05000-
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
E. Safety Analysis
The actuation of the AFW system was valid and the system responded to plant conditions as designed. The condition did not result in a safety system functional failure and had no adverse impact on the health and safety of the public.
F. Additional Information
There have been no events similar to the event documented in this LER in the past three years.
3 3
Shearon Harris Nuclear Power Plant, Unit 1 400 2022 008 00