ML13136A012

NRR E-mail Capture - Monticello Nuclear Generating Plant; Request for Additional Information (Emcb) Extended Power Uprate License Amendment Request

ML13136A012
Person / Time
Site:	Monticello
Issue date:	05/10/2013
From:	Beltz T Plant Licensing Branch III
To:	Fields J Northern States Power Co
References
TAC MD9990
Download: ML13136A012 (3)

Text

NRR-PMDAPEm Resource From: Beltz, Terry Sent: Friday, May 10, 2013 12:13 PM To: 'Fields, John S.'

Cc: 'Hammer, Steven J.'; Tsirigotis, Alexander; Carlson, Robert

Subject:

Monticello Nuclear Generating Plant - Request for Additional Information (EMCB) re:

Extended Power Uprate License Amendment Request (TAC No. MD9990)

Attachments: Monticello - Request for Additional Information (EMCB) Regarding EPU LAR (TAC No.

MD9990).docx

Dear Mr. Fields:

By letter dated November 5, 2008, Northern States Power Company, a Minnesota Corporation (NSPM, the licensee), submitted a license amendment request (LAR) for the Monticello Nuclear Generating Plant (MNGP).

The proposed amendment would change the MNGP operating license to increase the maximum authorized power level by approximately 13 percent of current licensed thermal power. The extended power uprate (EPU) would represent an increase of approximately 20 percent above the original licensed thermal power level.

The U.S. Nuclear Regulatory Commission staff in the Mechanical and Civil Engineering Branch of the Office of Nuclear Reactor Regulation has identified areas where additional information is needed to complete its review related to the EPU LAR. The requests for additional information (RAIs) are attached.

The details of the RAIs were discussed with NSPM staff during a teleconference on May 10, 2013, to ensure a clear understanding of the questions raised by the NRC staff.

Please provide a response to these RAIs no later than May 31, 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: 697 Mail Envelope Properties (Terry.Beltz@nrc.gov20130510121300)

Subject:

Monticello Nuclear Generating Plant - Request for Additional Information (EMCB) re: Extended Power Uprate License Amendment Request (TAC No. MD9990)

Sent Date: 5/10/2013 12:13:12 PM Received Date: 5/10/2013 12:13:00 PM From: Beltz, Terry Created By: Terry.Beltz@nrc.gov Recipients:

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

Tracking Status: None "Tsirigotis, Alexander" <Alexander.Tsirigotis@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 1406 5/10/2013 12:13:00 PM Monticello - Request for Additional Information (EMCB) Regarding EPU LAR (TAC No. MD9990).docx 17764 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: ZZZ

REQUEST FOR ADDITIONAL INFORMATION MECHANICAL AND CIVIL ENGINEERING BRANCH OF THE OFFICE OF NUCLEAR REACTOR REGULATION RELATING TO THE LICENSE AMENDMENT REQUEST FOR EXTENDED POWER UPRATE NORTHERN STATES POWER COMPANY - MINNESOTA (NSPM)

MONTICELLO NUCLEAR GENERATING PLANT DOCKET NO. 50-263 (TAC NO. MD9990)

1. With regard to the condensate and feedwater modifications, in your letter [L-MT-12-114] dated January 21, 2013 (Agencywide Documents and Access System Accession No. ML130390220),

Enclosure 1, page 56 of 80, Item 26, indicates that a Complete discussion regarding jet impingement and pipe whip were requested by the NRC.

Page 62 of 80 states that piping evaluations resulted in a new limiting (for flooding) postulated 14"-line crack at the inlet to the 14 feedwater heater. Also, The new crack did not result in any new jet impingement or pipe whip targets. Page 62 of 80 shows that Pipe whip and jet impingement analyses are pending for the Condensate pump, Feedwater pump, and piping replacement modifications.

Please provide further clarification to your response.

2. If the initial information in PUSAR regarding the paragraph that discusses the 90% and 63% of the RWCU HELB M&E releases is no longer accurate and has been deleted in the revised pages of the PUSAR, then the mark-up or revision to the RAI-6(a) [response Item 26 in L-MT-12-114] response needs to reflect that. As it currently exists in the submittal, it indicates that a question was asked for the 90% and 63%

increases and that an answer has not been provided.

Please provide further clarification to your response.

3. Tables 26-1 and 26-2 contain data for HELB flood levels, HELB temperatures and HELB pressures which show increases at EPU conditions compared to CLTP.

Please provide an evaluation of this data for the increases shown and determine whether the impacted structures, systems, and components are structurally adequate to perform their intended design functions for the increases in differential pressures, temperatures and flooding levels.

4. In a previous response (2009 era) to RAI-6(b), NSPM stated that these parameters were evaluated for plant areas and structures. At that time, though, the HELB analyses and modifications were incomplete.

Now that the analyses are complete, the licensee has shown how these parameters have increased for EPU.

If the effects of the increase in these parameters have been evaluated and shown to be acceptable, then please verify that statement.