ML13260A372

NRR E-mail Capture - Request for Additional Information - Fermi 2 - LAR to Relocate Pressure and Temperature Curves to a Pressure Temperature Limits Report - MF0446

ML13260A372
Person / Time
Site:	Fermi
Issue date:	09/10/2013
From:	Mahesh Chawla Division of Operating Reactor Licensing
To:	Hassoun A Detroit Edison, Co
References
TAC MF0446
Download: ML13260A372 (3)

Text

NRR-PMDAPEm Resource From: Chawla, Mahesh Sent: Tuesday, September 10, 2013 5:06 PM To: Alan I Hassoun Cc: Widrevitz, Dan; Parks, Benjamin; Hardgrove, Matthew; Grover, Ravinder

Subject:

Request for Additional Information - Fermi 2 - LAR to Relocate Pressure and Temperature Curves to a Pressure Temperature Limits Report - MF0446 By letter dated December 21, 2012, (Agencywide Documents Access and Management System Accession No. ML13004A134) Detroit Edison Energy Company, the licensee for Fermi, Unit 2, (Fermi 2), submitted for staff review and approval a license amendment request to implement a Pressure Temperature Limits Report (PTLR). In order to complete its review of the licensees submittal, the Nuclear Regulatory Commission (NRC) staff requires additional information to complete its review. Please arrange a teleconference with the NRC staff to discuss this request in case if any clarification is needed. Thanks

RAI 1

The final two columns of Tables B-5 and B-6 of Enclosure 5 to the submittal refer to shift and ART values. The values contained in these columns represent the 1/4T shift and ART values.

This is not consistent with the column titles. The staff request that the column titles be revised to correctly identify the information contained below them.

RAI 2

Provide a basis for the difference in the margin terms between the Tables B-5 and B-6 of Enclosure 5 and why this is acceptable.

RAI 3

Clarify precisely how the N16 water level nozzle was accounted for in the PTLR including relevant inputs and calculations.

RAI 4

Clarify precisely how the beltline limiting portions of the curve were generated including relevant inputs and calculations.

RAI 5

10 CFR Part 50, Appendix G, Paragraph IV.A states that, the pressure-retaining components of the reactor coolant pressure boundary [RCPB] that are made of ferritic materials must meet the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code [ASME Code],Section III, supplemented by the additional requirements set forth in

[paragraph IV.A.2, Pressure-Temperature (P-T) Limits and Minimum Temperature Requirements"]

Therefore, 10 CFR Part 50, Appendix G requires that P-T limits be developed for the ferritic materials in the reactor vessel (RV) beltline (neutron fluence 1 x 1017 n/cm2, E > 1 MeV), as well as ferritic materials not in the RV beltline (neutron fluence < 1 x 1017 n/cm2, E > 1 MeV). Further, 10 CFR Part 50, Appendix G requires that all RCPB components must meet the ASME Code,Section III requirements. The relevant ASME Code,Section III requirement that will affect the P-T limits is the lowest service temperature requirement for all RCPB components specified in Section III, NB-2332(b).

The P-T limit calculations for ferritic RCPB components that are not RV beltline shell materials may define P-T curves that are more limiting than those calculated for the RV beltline shell materials due to the following:

RV nozzles, penetrations, and other discontinuities have complex geometries that may exhibit significantly higher stresses than those for the RV beltline shell region. These higher stresses can potentially result in more restrictive P-T limits, even if the reference temperature (RTNDT) for these components is not as high as that of RV beltline shell materials that have simpler geometries.

1

Ferritic RCPB components that are not part of the RV may have initial RTNDT values, which may define a more restrictive lowest operating temperature in the P -T limits than those for the RV beltline shell materials.

Consequently, please describe how the P-T limit curves submitted for Fermi 2 and the methodology used to develop these curves, considered all RV materials (beltline and nonbeltline) and the lowest service temperature of all ferritic RCPB materials, consistent with the requirements of 10 CFR Part 50, Appendix G.

Mahesh Chawla Project Manager Phone: 301-415-8371 Fax: 301-415-1222 mahesh.chawla@nrc.gov 2

Hearing Identifier: NRR_PMDA Email Number: 838 Mail Envelope Properties (Mahesh.Chawla@nrc.gov20130910170600)

Subject:

Request for Additional Information - Fermi 2 - LAR to Relocate Pressure and Temperature Curves to a Pressure Temperature Limits Report - MF0446 Sent Date: 9/10/2013 5:06:26 PM Received Date: 9/10/2013 5:06:00 PM From: Chawla, Mahesh Created By: Mahesh.Chawla@nrc.gov Recipients:

"Widrevitz, Dan" <Dan.Widrevitz@nrc.gov>

Tracking Status: None "Parks, Benjamin" <Benjamin.Parks@nrc.gov>

Tracking Status: None "Hardgrove, Matthew" <Matthew.Hardgrove@nrc.gov>

Tracking Status: None "Grover, Ravinder" <Ravinder.Grover@nrc.gov>

Tracking Status: None "Alan I Hassoun" <hassouna@dteenergy.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 3776 9/10/2013 5:06:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: