05000400/LER-2022-001, Essential Services Chilled Water Chiller Inoperable Due to Pre-Rotation Vane Actuator Control Arm Position
| ML22070A034 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 03/10/2022 |
| From: | Hoffman D Duke Energy Progress |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA-22-0067 LER 2022-001-00 | |
| Download: ML22070A034 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| 4002022001R00 - NRC Website | |
text
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David S. Hoffman Plant Manager Shearon Harris Nuclear Power Plant 5413 Shearon Harris Road New Hill, NC 27562-9300 10 CFR 50.73 March 10, 2022 Serial: RA-22-0067 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 2022-001-00 Ladies and Gentlemen:
Duke Energy Progress, LLC, submits the enclosed Licensee Event Report 2022-001-00 in accordance with 10 CFR 50.73 for Shearon Harris Nuclear Power Plant, Unit 1 (HNP). This report describes a condition impacting the 'A' Train of the Essential Services Chilled Water (ESCW) System. Analysis of the condition concluded that the 'A' Train of the ESCW System was inoperable for a period longer than permitted by Technical Specifications prior to discovery of the condition. Additionally, there were periods in which the 'B' Train of the ESCW System was inoperable for planned maintenance while the condition was present. 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 Chuck Yarley at (984) 229-2477.
Since~u(~
David S. Hoffman Enclosure: Licensee Event Report 2022-001 -00 cc:
J. Zeiler, NRC Senior Resident Inspector, HNP A. Hon, NRC Project Manager, HNP NRC Regional Administrator, Region II
Abstract
Shearon Harris Nuclear Power Plant, Unit 1 400 4
Essential Services Chilled Water Chiller Inoperable Due to Pre-Rotation Vane Actuator Control Arm Position 1
10 2022 2022 001 00 3
10 2022 Mode 1 100%
Chuck Yarley (984) 229-2477 D
On January 10, 2022, a Reactor Auxiliary Building operator for the Shearon Harris Nuclear Power Plant, Unit 1, noted that the 'A' Train Essential Services Chilled Water System chillers compressor pre-rotation vane (PRV) was mispositioned. This resulted in the chiller being declared inoperable at 07:57 on January 10th. Maintenance personnel identified that the PRV control arm had slipped at its tapered connection to the associated control shaft due to reduced torque on the cap screw holding it in place. The chiller was declared operable on January 11th at 21:09, following successful completion of corrective maintenance.
The cause of the slippage was inadequate guidance within maintenance procedure CM-M0259, "Essential Chiller Compressor Maintenance," which presented a latent error trap for installation of the cap screw over an adjacent cam plate. This resulted in torque loss on the fastener while the chiller was in operation. The cap screw was previously installed during a maintenance activity involving a replacement of the compressor and the PRV actuator in August 2021. To address this condition, the cap screw was retorqued to proper specification and the adjacent cam plate was validated to no longer interfere with the cap screw.
CM-M0259 was revised to provide guidance for proper cap screw installation.Page of 05000-
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
Note: Energy Industry Identification System (EIIS) codes are identified in the text within brackets [].
F. Additional Information
No LERs have been issued by HNP in the past three years for a similar issue.
4 4
Shearon Harris Nuclear Power Plant, Unit 1 400 2022 001 00