DCL-19-086, Supplement to License Amendment Request 18-02, License Amendment Request to Revise Technical Specification 5.6.5b, Core Operating Limits Report (COLR) for Full Spectrum Loss-of-Coolant Accident Methodology
| ML19297H634 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/24/2019 |
| From: | Gerfen P Pacific Gas & Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| DCL-19-086 | |
| Download: ML19297H634 (2) | |
Text
Pacific Gas and Electric Company*
October 24, 2019 PG&E Letter DCL-19-086 U.S. Nuclear Regulatory Commission ATTN: Document Control De~k Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Units 1 and 2 Paula Gerten Site Vice President Diablo Canyon Power Plant Mail code 104/6/605 P.O. Box 56 Avila Beach, CA 93424 805.545.4596 Internal: 691.4596 Fax: 805.545.4234 10 CFR 50.90 Supplement to "License Amendment Request 18-02, License Amendment Request to Revise Technical Specification 5.6.5b, 'Core Operating Limits Report (COLR)' for Full Spectrum Loss-of-Coolant Accident Methodology"
Reference:
- 1. PG&E Letter DCL-18-100, "License Amendment Request 18-02, License Amendment Request to Revise Technical Specification 5.6.5b, 'Core Operating Limits Report (COLR)' for Full Spectrum Loss-of-Coolant Accident Methodology," dated December 26, 2018 [ML19003A196]
Dear Commissioners and Staff:
In Reference 1, Pacific Gas and Electric Company (PG&E) submitted a license amendment request (LAR) to revise the Technical Specification 5.6.5b, "Core Operating Limits Report (COLR)" for the Westinghouse Full Spectrum TM Loss-of-Coolant Accident (FSLOCA ') Methodology. Attachment 4 to the Enclosure of Reference 1 provided the Updated Final Safety Analysis Report (UFSAR) changes associated with the FSLOCATM analysis for information only.
During NRC staff review of the LAR (Reference 1), the staff identified an error in the UFSAR changes contained in Attachment 4. Specifically, in UFSAR Table 6.5-2, "Summary of Assumptions Auxiliary Feedwater [AFW] System Design Verification," line item e., "Decay Heat," column "Small Break Loss of Coolant Accident," the reference was revised from "Figure 15.1-7" to "Figure 15.1-6; however Figure 15.1-6, "Residual Decay Heat (Best Estimate LBLOCA 1979 ANS Decay Heat)" was marked as being deleted.
The decay heat curve used in the FSLOCATM analysis is described in to the Enclosure of Reference 1 in UFSAR Section 15.1.10.1 A
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Document Control Desk October 24, 2019 Page 2 PG&E Letter DCL-19-086 (UFSAR page 15.1-14), "Fission Product Decay." Therefore, the correct reference for UFSAR Table 6.5-2, line item e., "Decay Heat," column "Small Break Loss of Coolant Accident," is "Section 15.1.10.1."
The UFSAR change described in this supplement does not impact the significant hazards consideration evaluation, Technical Specifications changes, or the Technical Specification Bases changes contained in Reference 1.
PG&E makes no new or revised regulatory commitments (as defined by NEI 99-04) in this letter.
If you have any questions or require additional information, please contact Mr. Hossein Hamzehee, Regulatory Services Manager, at (805) 545-4720.
I state under penalty of perjury that the foregoing is true and correct.
Executed on October 24, 2019.
Sincen
//AJ~t;+
Paula Gerfen U
Site Vice President kjse/4328/51049726 cc:
Diablo Distribution Scott A. Morris, NRC Region IV Administrator Gonzalo L. Perez, Branch Chief, California Department of Public Health John P. Reynoso, Acting NRC Senior Resident Inspector Balwant K. Singal, NRC Senior Project Manager A
member of the STARS Alliance Callaway
- Diablo Canyon
- Palo Verde
- Wolf Creek