From: Fields, John S.To: Gibson, LaurenCc: Eckholt, Gene F.; Rohrer, Rick J.; Gunderson, LynneSubject: [External_Sender] Monticello Nuclear Generating Plant Flood Hazard Reevaluation Report - Response to

Requested Information (CAC No. MF7712)Date: Friday, September 23, 2016 11:03:54 AM

Ms. Gibson,On August 18, 2016, a joint audit call was held between the NRC and Northern States PowerCompany, a Minnesota corporation (NSPM), d/b/a Xcel Energy, related to the Monticello NuclearGenerating Plant’s (MNGP’s) Flood Hazard Reevaluation Report (FHRR) (dated May 12, 2016; ADAMSAccession No. ML16145A179 and ML16145A180). The audit call was held in accordance with theNRC audit plan (ADAMS Accession No. ML16152A125). As a result of the audit call, the NRCrequested on August 30, 2016 that information be submitted on the docket by October 28, 2016.The information request is repeated below along with a response to the request.Requested Information for MNGP

Please provide revised figure(s) to include all critical door opening locations, river reaches,and cross section associated with each of the critical door locations using appropriateannotations and legends.

Northern States Power – Minnesota (NSPM) Response:Eleven figures are attached to this email, which include all critical door opening locations, riverreaches, and cross sections.In addition, as discussed in the August 18, 2016 audit call, NSPM identified that calculation180999.51.1005, Tables 3.0-1 & 5.4-5 contained incorrect information. The tables indicate that Door1 has a water surface outside the door that is 2.09 ft above the door sill. The calculation had actuallydetermined that the water surface outside Door 1 was only 0.5 ft above the door sill. This reportedresult is conservative and therefore the calculation is not being changed. Note that on the enclosedfigure for Door 1, NSPM has included both the original and corrected water surface values.Finally, as discussed in the August 18, 2016 audit call and in a call with A. Minarik on July 7, 2016, thedoor listed on the figure as Door 341 is actually an unnumbered door in the Plant AdministrationBuilding stairway that is adjacent to Door 341. This does not affect any conclusions of the FHRR orLIP analyses. We simply wanted to bring it to your attention.Please contact me if you have any questions.Thank you,John S. Fields763-271-6707Monticello Projects Licensing2807 West County Rd 75, Monticello MN 55362