ML18324A674

Request for Additional Information (FINAL)- LAR to Allow 2SRV/SVs OOS at High Pressure

ML18324A674
Person / Time
Site:	Peach Bottom
Issue date:	11/15/2018
From:	Jennifer Tobin Plant Licensing Branch 1
To:	Bryan Hanson Exelon Nuclear
Tobin J
References
EPID L-2018-LLA-0151
Download: ML18324A674 (2)

Text

From: Tobin, Jennifer To: "Helker, David P:(GenCo-Nuc)"

Cc: "Gropp Jr, Richard W:(GenCo-Nuc)"; "Neff, David B:(GenCo-Nuc)"

Subject:

Peach Bottom Units 2 and 3 - Request for Additional Information (FINAL)- LAR to Allow 2SRV/SVs OOS at High Pressure (EPID L-2018-LLA-0151)

Date: Thursday, November 15, 2018 2:05:00 PM

Dear Mr. Helker,

By letter dated May 30, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18150A387), Exelon Generation Company, LLC (EGC, the licensee) requested changes to the Technical Specifications (TSs) for Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3, to allow continued operation with two Safety Relief Valves/Safety Valves (SRVs/SVs) out-of-service and to increase the Reactor Coolant System Pressure Safety Limit.

The Nuclear Regulatory Commissions (NRC) staff is reviewing your submittal and has determined that additional information is needed to complete its review. The specific request for additional information (RAI) is provided below. A clarification phone call was held November 15, 2018. In that call, you noted that the draft RAIs transmitted November 8, 2018 did not contain proprietary information. As a result of the call, the draft RAIs have been clarified. A response to these RAIs is requested by December 10, 2018.

If you have any questions, please contact me at (301) 415-2328. A copy of this e-mail will be made publicly available in ADAMS.

Thanks, Jenny OFFICE OF NUCLEAR REACTOR REGULATION REACTOR SYSTEMS BRANCH REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATIONS 2.1.2 AND 3.4.3 PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 DOCKET NOS. 50-277 AND 50-278 INTRODUCTION By application, dated May 30, 2018 (Agencywide Documents Access and Management System (ADAMS)

Accession No. ML18150A387), Exelon Generating Company, LLC submitted a License Amendment Request (LAR) for Peach Bottom Atomic Power Station, Units 2 and 3 (PBAPS). The proposed LAR would revise PBAPS Technical Specifications to allow continued operation with two Safety Relief Valves/Safety Valves (SRVs/SVs) out-of-service and to increase the Reactor Coolant System Pressure Safety Limit (SL).

RAI-SRXB-1: ASME Overpressure Analysis with New Reactor Pressure Safety Limit Draft GDCs 9, 33 and final GDC 31 require overpressure protection during power operation be provided by relief/safety valves (SRVs/SVs) and protection system. The LAR proposed to raise a new reactor coolant system pressure safety limit so that the impact of the ASME overpressure analysis with 2 SRVOOS can be accepted. To facilitate the staff review, provide the following information associated with the analysis as provided in the LAR:

1. Peach Bottom technical specification bases 2.1.2 indicates the RCS pressure SL is selected to be the lowest transient overpressure allowed by the applicable codes. Please verify the locations for the peak vessel pressure as reported in Tables 1 and 2 of the LAR are consistent with the TS bases.

2. A verification of whether a TRACG statistical pressure adder had been applied to the peak vessel pressure as reported in the Tables 1 and 2 of LAR. Note that it is known that an adder will be applied to the peak steam dome pressure. However, it is not clear if an adder will also be applied to the peak vessel pressure

to be reported. Provide justification if the TRACG statistical pressure adder is not applied,

3. Justify that if the steam dome pressure were to approach the proposed reactor steam dome limit of 1340 psig the corresponding peak vessel pressure will still be below the ASME limit of 1375 psig with margin.