RS-19-002, ECCS Evaluation Model Error - 10 CFR 50.46 30-Day Report

ECCS Evaluation Model Error - 10 CFR 50.46 30-Day Report

ML19009A421
Person / Time
Site:	Quad Cities
Issue date:	01/09/2019
From:	Simpson P Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-19-002
Download: ML19009A421 (6)

Text

Exelon Generation,_

RS-19-002 January 9, 2019 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Quad Cities Nuclear Power Station, Units 1 and 2 4300 Winfield Road Warrenville, IL 60555 630 65 7 2000 Office 10 CFR 50.46 Renewed Facility Operating License Nos. DPR-29 and DPR-30 NRC Docket Nos. 50-254 and 50-265

Subject:

ECCS Evaluation Model Error - 1 O CFR 50.46 30-Day Report

Reference:

Letter from P.R. Simpson (Exelon Generation Company, LLC) to U.S. NRC, "10 CFR 50.46 Annual Report," dated May 2, 2018 In accordance with 1 O CFR 50.46, "Acceptance criteria for emergency core cooling systems for light-water nuclear power reactors," paragraph (a)(3)(ii), Exelon Generation Company, LLC, (EGC) is submitting the attached information to fulfill the 30-day reporting requirement for Quad Cities Nuclear Power Station (QCNPS), Units 1 and 2.

In the referenced letter, EGC submitted the most recent 1 O CFR 50.46 report for Quad Cities Nuclear Power Station, Units 1 and 2, describing the cumulative changes in the peak cladding temperature (PCT) for the current emergency core cooling systems evaluation model.

Framatome Inc. subsequently notified EGC of four errors and an input change impacting the ATRIUM 10XM Large Break Loss of Coolant Accident (LBLOCA) analysis. A 30-day report is required since the cumulative sum of the absolute magnitudes of the respective PCT changes resulting from these errors and input change is greater than 50°F.

The revised PCT value remains well below the 1 O CFR 50.46 acceptance criteria of 2200°F; therefore, a reanalysis is not required due to these errors and input change.

Attachments 1 and 2 provide updated information regarding the cumulative changes to the PCT values for the limiting ATRIUM 10 XM LBLOCA analysis for Quad Cities Nuclear Power Station, Units 1 and 2. Attachment 3 contains the associated Assessment Notes. There are no impacts to the Westinghouse LBLOCA analysis results reported in the referenced letter.

U.S. Nuclear Regulatory Commission January 9, 2019 Page 2 There are no regulatory commitments contained in this submittal. Should you have any questions regarding this letter, please contact Ms. Rebecca L. Steinman at (630) 657-2831.

R~R Patrick R. Simpson Manager - Licensing Exelon Generation Company, LLC Attachments:

1. Quad Cities Nuclear Power Station Unit 1, 1 O CFR 50.46 Report (Framatome Fuel)

2. Quad Cities Nuclear Power Station Unit 2, 1 O CFR 50.46 Report (Framatome Fuel)

3. Quad Cities Nuclear Power Station Units 1 and 2, 1 O CFR 50.46 30-Day Report Assessment Notes cc:

NRC Regional Administrator - Region Ill NRC Senior Resident Inspector, Quad Cities Nuclear Power Station

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