ML21194A050

Change of Commitment Date for NEI Open Phase Initiative

ML21194A050
Person / Time
Site:	Calvert Cliffs
Issue date:	07/13/2021
From:	Haaf T Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML21194A050 (4)

Text

Thomas P. Haaf Site Vice President Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657 410-495-5200 Office 717-327-7728 Mobile www.exeloncorp.com Thomas.Haaf@exeloncorp.com July 13, 2021 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318

Subject:

Change of Commitment Date for NEI Open Phase Initiative

Reference:

1. Letter from T. P. Haaf (CCNPP) to Document Control Desk (NRC), dated July 20, 2020, Change of Commitment Date for NEI Open Phase Initiative In Reference 1, Calvert Cliffs Nuclear Power Plant (Calvert Cliffs) submitted a letter deferring the full implementation of the Open Phase Condition (OPC) Detection system until June 30, 2021. The purpose of this letter is to notify the NRC that Calvert Cliffs plans to extend the completion date to Oct 30, 2021.

As previously communicated, Calvert Cliffs selected and installed on both units the OPC Detection system that was developed by Schweitzer Engineering Laboratories (SEL). The subsequent installation of a third 13kV service transformer along with several associated 13kV busses required changes to the existing OPC detection algorithm. As a result, a new monitoring period was entered to evaluate algorithm performance. The final set of data for this evaluation has been collected and is currently being analyzed. During the monitoring period, the system will have alarms enabled to notify Operations of potential Open Phase Conditions. At the conclusion of the monitoring period, Calvert Cliffs will remain in Alarm-Only mode using the guidance from NEI 19-02. This short extension to fully implement OPC detection will not adversely impact the safe operation of Calvert Cliffs Units 1 and 2.

Attachment (1) lists the changed commitment.

Should you have questions regarding this matter, please contact Mr. Larry D. Smith at (410) 495-5219.

Respectfully, Thomas P. Haaf Site Vice President TPH/KG/lmd

Document Control Desk July 13, 2021 Page 2

Attachment:

(1) Summary of Regulatory Commitments cc: (Without Attachments)

NRC Project Manager, Calvert Cliffs NRC Regional Administrator, Region 1 NRC Resident Inspector, Calvert Cliffs S. Seaman, MD-DNR

ATTACHMENT (1)

SUMMARY

OF REGULATORY COMMITMENTS Calvert Cliffs Nuclear Power Plant July 13, 2021

ATTACHMENT (1)

SUMMARY

OF REGULATORY COMMITMENTS The following table identifies commitments made in this document. (Any other actions discussed in the submittal represent intended or planned actions. They are described to the NRC for the NRCs information and are not regulatory commitments.)

COMMITTED COMMITMENT TYPE COMMITMENT DATE OR One-Time Action Programmatic OUTAGE (Yes/No) (Yes/No)

Full implementation of the NEI Open October 30, Yes No Phase Initiative 2021 1