ML13137A102

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NRR E-mail Capture - Monticello Nuclear Generating Plant - Requests for Additional Information (Scvb) Supporting the EPU and Mellla+ Reviews
ML13137A102
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 04/24/2013
From: Beltz T
Plant Licensing Branch III
To: Fields J
Northern States Power Co
References
TAC MD9990, TAC ME3145
Download: ML13137A102 (3)


Text

NRR-PMDAPEm Resource From: Beltz, Terry Sent: Wednesday, April 24, 2013 6:59 AM To: 'Fields, John S.'

Cc: 'Hammer, Steven J.'; Sallman, Ahsan; Carlson, Robert

Subject:

Monticello Nuclear Generating Plant - Requests for Additional Information (SCVB) Supporting the EPU and MELLLA+ Reviews (TAC Nos. MD9990 and ME3145)

Attachments: Monticello - Request for Additional Information (SCVB) on GEH Response to RAI 10(b).docx

Dear Mr. Fields:

The U.S. Nuclear Regulatory Commission (NRC) staff in the Containment and Ventilation Branch of the Office of Nuclear Reactor Regulation is currently supporting the review of your license amendment requests associated with an Extended Power Uprate and Maximum Extended Load Line Limit Analysis Plus (MELLLA+)

expanded operating domain. The NRC staff has determined that additional information is required to complete its review.

The requests for additional information (RAI) are attached. The NRC staff discussed the content of the draft RAIs with representatives from Xcel Energy and GE-Hitachi in an April 23, 2013, teleconference. Please provide a response to the attached RAIs no later than May 24, 2013.

Please let me know if you have any questions or concerns.

Sincerely, Terry A. Beltz, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation (301) 415-3049 Terry.Beltz@nrc.gov 1

Hearing Identifier: NRR_PMDA Email Number: 698 Mail Envelope Properties (Terry.Beltz@nrc.gov20130424065800)

Subject:

Monticello Nuclear Generating Plant - Requests for Additional Information (SCVB) Supporting the EPU and MELLLA+ Reviews (TAC Nos. MD9990 and ME3145)

Sent Date: 4/24/2013 6:58:35 AM Received Date: 4/24/2013 6:58:00 AM From: Beltz, Terry Created By: Terry.Beltz@nrc.gov Recipients:

"'Hammer, Steven J.'" <Steven.Hammer@xenuclear.com>

Tracking Status: None "Sallman, Ahsan" <Ahsan.Sallman@nrc.gov>

Tracking Status: None "Carlson, Robert" <Robert.Carlson@nrc.gov>

Tracking Status: None

"'Fields, John S.'" <John.Fields@xenuclear.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 1049 4/24/2013 6:58:00 AM Monticello - Request for Additional Information (SCVB) on GEH Response to RAI 10(b).docx 17616 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

REQUEST FOR ADDITIONAL INFORMATION (RAI)

FROM THE CONTAINMENT AND VENTILATION BRANCH OF THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING THE REVIEW OF THE EXTENDED POWER UPRATE AND MELLLA+

LICENSE AMENDMENT REQUESTS NORTHERN STATES POWER COMPANY - MINNESOTA (NSPM)

MONTICELLO NUCLEAR GENERATING PLANT DOCKET NO. 50-263 Please provide additional information in reference to NSPM letter dated March 21, 2013 (Agencywide Documents Access and Management System Accession No. ML13085A033), , GEH Response - RAI 10(b).

Refer to NEDC-33322P, Revision 2, Section 2.6.3.1.1 Section 2.6.3.1.1- Short Term Gas Temperature Response The drywell air space temperature limit is specified in Table 2.6-1. The limit is increased for EPU from 335 °F to 340 °F.

The GEH response to RAI 10(b) states the following:

The peak drywell temperatures reported under EPU/MELLLA conditions in Table 2.6-1 of NEDC-33322P were obtained from a long-term containment response calculation for a small steam line break accident (SBA) at 102% of EPU power and 100% core flow with the SHEX code.

NRC Staff Comment The GEH response to RAI 10(b) appears to conflict with the NEDC-33322P Revision 2, Section 2.6.3.1.1.

The RAI response implies that the drywell gas temperature values in Table 2.6-1 of NEDC-33322P are based on a long term SBA analysis using SHEX code.

Section 2.6.3.1.1 of NEDC-33322P is referring to the short term drywell gas temperatures listed in Tables 2.6-1.

1. Please provide clarification as to whether the peak drywell temperatures of 335 °F, 336 °F, and 338 °F listed in Table 2.6-1 are based on short term SBA analysis or long term SBA analysis with SHEX code.
2. Please provide additional clarification (e.g., footnote(s)) in Table 2.6-1 to further differentiate between long term and short term SBA analyses.