ML12089A490

E-MAIL - Draft Balance of Plant Request for Additional Information for Mur Review

ML12089A490
Person / Time
Site:	Byron, Braidwood
Issue date:	03/29/2012
From:	Mozafari B Plant Licensing Branch III
To:	Byam T, Gullott D, Holden L, Simpson L Exelon Corp
Mozafari B
References
TAC ME6587, TAC ME6588, TAC ME6589, TAC ME6590
Download: ML12089A490 (2)

Text

From: Mozafari, Brenda Sent: Thursday, March 29, 2012 3:25 PM To: Leslie.Holden@exeloncorp.com; timothy.byam@exeloncorp.com; Lisa.Simpson@exeloncorp.com; David.Gullott@exeloncorp.com

Subject:

DRAFT BALANCE OF PLANT REQUEST FOR ADDITIONAL INFORMATION FOR MUR REVIEW

((TAC NOS. ME6587,ME6588, ME6589 AND ME6590)

Leslie, Pursuant to 10 CFR 50.90, by letter to the Nuclear Regulatory Commission (NRC) dated June 23, 2011, the Exelon Generation Company, LLC (the licensee), submitted a license amendment request (LAR) for the Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2. The proposed measurement uncertainty recapture power uprate would increase the current licensed thermal power at Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, by approximately 1.63 percent. The NRC staff has identified additional information (shown below) that is needed to complete the technical review.

After you have had time to consider your response, we can schedule a call to provide any clarifications and discuss your planned response. I will provide the question formally after our discussion, however we would expect the question to be responded to by letter within 30 days of this email (by April 27, 2012). Please let me know when you are ready for a telecon for clarification and discussion of the path forward.

Thanks, Brenda L. Mozafari Senior Project Manager, NRR/DORL U.S. Nuclear Regulatory Commission 301-415-2020 email: brenda.mozafari@nrc.gov BRAIDWOOD STATION, UNIT NOS. 1 & 2, AND BYRON STATION, UNIT NOS 1 & 2 REQUEST FOR FOLLOW-UP ADDITIONAL INFORMATION REGARDING MEASUREMENT UNCERTAINTY RECAPTURE (MUR) POWER UPRATE TAC NOS.

ME6587, ME6588, ME6589, ME6590 BALANCE OF PLANT BRANCH - RAI - 6 Section 3.6.1.1 of the Braidwood and Byron Updated Final Safety Analysis Report (UFSAR),

Design Basis, contains the criteria related to the classification of high energy and moderate energy fluid systems at Braidwood and Byron. Further, Section 3.6.1.1.1 of the Braidwood and Byron UFSAR, Definitions, defines a high energy fluid system at these facilities as one where either or both of the following requirements are met: maximum operating temperature exceeds 200 °F or maximum operating pressure exceeds 275 psig. Additionally, Section 3.6.1.1.1 of the Braidwood and Byron UFSAR defines a moderate energy fluid system as those systems which are either in operation or maintained pressurized (above atmospheric pressure) during normal

plant conditions and meet the following requirements: maximum operating temperature is 200

°F or less and maximum operating pressure is 275 psig or less. However,Section VII.6.B of to the Braidwood and Byron measurement uncertainty recapture (MUR) power uprate submittal states:

High-energy pipe breaks are analyzed for piping for which the maximum operating pressure exceeds 275 psig and the maximum operating temperature equals or exceeds 200 deg F. High-energy pipe cracks are postulated in piping for which either the operating pressure exceeds 275 psig or the operating temperature equals or exceeds 200 deg F.

a) Address the apparent discrepancy between the MUR power uprate license amendment request submittal and the UFSAR criteria related to the classification of high and moderate energy systems at Braidwood and Byron.

b) Confirm that the evaluations performed to support the implementation of the MUR power uprate at Braidwood and Byron appropriately considered the criteria stipulated in the UFSAR related to high and moderate energy fluid system classification and high energy line break and moderate energy line crack postulation.

Brenda L. Mozafari Senior Project Manager, NRR/DORL U.S. Nuclear Regulatory Commission 301-415-2020 email: brenda.mozafari@nrc.gov