L-MT-13-032, Correction to the MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident: Difference between revisions

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{{#Wiki_filter:Xcel Energy@ Monticello Nuclear Generating Plant 2807 W. CR 75, Monticello Monticello, MN 55362 March 29, 2013 L-MT-13-032 10 CFR 50.54(f) U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
{{#Wiki_filter:Xcel Energy@                                         Monticello Nuclear Generating Plant 2807 W. CR 75, Monticello Monticello, MN 55362 March 29, 2013                                                                 L-MT-13-032 10 CFR 50.54(f)
* Monticello Nuclear Generating Plant Docket No. 50-263 Renewed Facility Operating License No. DPR-22 Correction to the MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident  
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
* Monticello Nuclear Generating Plant Docket No. 50-263 Renewed Facility Operating License No. DPR-22 Correction to the MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident


==References:==
==References:==
: 1. NSPM Letter to NRC, "MNGP Final Response to NRC Request for Information Pursuant to 1 0 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated November 27,2012, ADAMS Accession No. ML12333A348.
: 1. NSPM Letter to NRC, "MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated November 27,2012, ADAMS Accession No. ML12333A348.
: 2. NRC Letter, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated March 12,2012, ADAMS Accession No. ML12053A340.
: 2. NRC Letter, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated March 12,2012, ADAMS Accession No. ML12053A340.
In Reference 1, the Northern States Power Company, a Minnesota corporation (NSPM), d/b/a Xcel Energy, provided the results of the external flooding walkdowns performed at the Monticello Nuclear Generating Plant (MNGP). These results were provided to the NRC as a result of information requested per 10 CFR 50.54(f) in a letter dated March 12,2012 (Reference 2). During subsequent reviews of the flooding walkdown report, NSPM identified two items in the Reference 1 report that require correction.
In Reference 1, the Northern States Power Company, a Minnesota corporation (NSPM),
d/b/a Xcel Energy, provided the results of the external flooding walkdowns performed at the Monticello Nuclear Generating Plant (MNGP). These results were provided to the NRC as a result of information requested per 10 CFR 50.54(f) in a letter dated March 12,2012 (Reference 2). During subsequent reviews of the flooding walkdown report, NSPM identified two items in the Reference 1 report that require correction.
They do not impact the original conclusion of the Reference 1 report that the external flooding program is effective.
They do not impact the original conclusion of the Reference 1 report that the external flooding program is effective.
The purpose of this letter is to provide replacement pages to correct the original report. The enclosure to this letter provides a description of the corrections needed. The attachment to the enclosure contains the replacement pages for the report.
The purpose of this letter is to provide replacement pages to correct the original report.
The enclosure to this letter provides a description of the corrections needed. The attachment to the enclosure contains the replacement pages for the report.
 
Document Control Desk Page 2 If there are any questions on these corrections, or if additional information is needed, please contact Ms. Jennie Eckholt, Licensing Engineer, at 612-330-5788.
Document Control Desk Page 2 If there are any questions on these corrections, or if additional information is needed, please contact Ms. Jennie Eckholt, Licensing Engineer, at 612-330-5788.
Summary of Commitments This letter proposes the following new commitment and no revisions to existing commitments.
Summary of Commitments This letter proposes the following new commitment and no revisions to existing commitments.
Regulatory Commitments Due Date NSPM will submit an updated external flooding walkdown November 20, 2013 report with a summary of the results of the restricted access walkdowns.
Regulatory Commitments                             Due Date NSPM will submit an updated external flooding walkdown         November 20, 2013 report with a summary of the results of the restricted access walkdowns.
I declare under penalty of perjury that the foregoing is true and correct. Executed on March 29, 2013. Mark A. Schimmel Site Vice President, Monticello Nuclear Generating Plant Northern States Power Company -Minnesota Enclosure cc: Administrator, Region III, USNRC Director, Office of Nuclear Reactor Regulation (NRR) NRR Project Manager, MNGP, USNRC Senior Resident Inspector, MNGP, USNRC ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report Page 1 of 3 ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report On March 12,2012, the NRC Staff issued Reference 2 to all NRC power reactor licensees and holders of construction permits in active or deferred status. Enclosure 4 of the March 12, 2012 letter contains specific Requested Actions, Requested Information, and Required Responses associated with Near-Term Task Force (NTTF) Recommendation 2.3, Flooding.
I declare under penalty of perjury that the foregoing is true and correct.
In Enclosure 4 of Reference 2, the NRC requested licensees to perform flooding walkdowns to verify that plant features credited in the current licensing basis (CLB) for protection and mitigation from external flood events are available, functional, and properly maintained.
Executed on March 29, 2013.
Northern States Power Company, a Minnesota corporation (NSPM), d/b/a Xcel Energy, provided the results of Monticello Nuclear Generating Plant's (MNGP) external flooding walkdowns in a letter with an enclosed report dated November 27,2012 (Reference 1). During subsequent reviews of the Reference 1 flooding walkdown report, NSPM identified two items requiring correction.
Mark A. Schimmel Site Vice President, Monticello Nuclear Generating Plant Northern States Power Company - Minnesota Enclosure cc:   Administrator, Region III, USNRC Director, Office of Nuclear Reactor Regulation (NRR)
NRR Project Manager, MNGP, USNRC Senior Resident Inspector, MNGP, USNRC
 
ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report Page 1 of 3
 
ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report On March 12,2012, the NRC Staff issued Reference 2 to all NRC power reactor licensees and holders of construction permits in active or deferred status. Enclosure 4 of the March 12, 2012 letter contains specific Requested Actions, Requested Information, and Required Responses associated with Near-Term Task Force (NTTF)
Recommendation 2.3, Flooding. In Enclosure 4 of Reference 2, the NRC requested licensees to perform flooding walkdowns to verify that plant features credited in the current licensing basis (CLB) for protection and mitigation from external flood events are available, functional, and properly maintained. Northern States Power Company, a Minnesota corporation (NSPM), d/b/a Xcel Energy, provided the results of Monticello Nuclear Generating Plant's (MNGP) external flooding walkdowns in a letter with an enclosed report dated November 27,2012 (Reference 1).
During subsequent reviews of the Reference 1 flooding walkdown report, NSPM identified two items requiring correction.
* Procedure Step Incorrectly Referenced
* Procedure Step Incorrectly Referenced
* Building Incorrectly Classified as Locked High Radiation These corrections are described in more detail in the following sections.
* Building Incorrectly Classified as Locked High Radiation These corrections are described in more detail in the following sections. Two replacement pages are provided in the Attachment to this enclosure to correct the flooding walkdown report.
Two replacement pages are provided in the Attachment to this enclosure to correct the flooding walkdown report. 1.0 Procedure Step Incorrectly Referenced Item 3 in Table 3.6-1, "Deficiency List," of Reference 1 incorrectly references the procedure step 5.2.11.H of the MNGP procedure A.6, "Acts of Nature." The table should reference step 5.2.11.W.
1.0     Procedure Step Incorrectly Referenced Item 3 in Table 3.6-1, "Deficiency List," of Reference 1 incorrectly references the procedure step 5.2.11.H of the MNGP procedure A.6, "Acts of Nature." The table should reference step 5.2.11.W. One replacement page (page 23) is provided in the attachment to this enclosure to correct the flooding walkdown report.
One replacement page (page 23) is provided in the attachment to this enclosure to correct the flooding walkdown report. 2.0 Building Incorrectly Classified as Locked High Radiation Areas or buildings which were not readily accessible during the flooding walkdowns were provided in Table 3.6-3, "Restricted Access," of Reference
2.0     Building Incorrectly Classified as Locked High Radiation Areas or buildings which were not readily accessible during the flooding walkdowns were provided in Table 3.6-3, "Restricted Access," of Reference 1. Item number 25 of this table identified the Compressed Gas Storage Building as a locked high radiation area. However, it was identified during the work order planning process that the areas requiring inspection are not locked high radiation areas and are accessible during normal plant operations. NSPM has entered this issue into the Corrective Action Program, and will complete the walkdown of the Compressed Gas Storage Building by October 31, 2013 per the commitment in Reference 1. One replacement page (page 28) is provided in the attachment to this enclosure to correct the flooding walkdown report.
: 1. Item number 25 of this table identified the Compressed Gas Storage Building as a locked high radiation area. However, it was identified during the work order planning process that the areas requiring inspection are not locked high radiation areas and are accessible during normal plant operations.
Page 2 of 3
NSPM has entered this issue into the Corrective Action Program, and will complete the walkdown of the Compressed Gas Storage Building by October 31, 2013 per the commitment in Reference
 
: 1. One replacement page (page 28) is provided in the attachment to this enclosure to correct the flooding walkdown report. Page 2 of 3 ENCLOSURE Description of Corrections and Replacement Pages for Monticello Nuclea'r Generating Plant's External Flooding Walkdown Report 3.0 Updated External Flooding Walkdown Report NSPM originally committed to complete the inspection of flood protection features identified in Table 3.6-3, "Restricted Access," of Reference 1 by October 31,2013. Any deficiencies identified as a result of the completion of these inspections will be provided to the NRC in an updated external flooding walkdown report. NSPM will submit an updated external flooding walkdown report with a summary of the results of the restricted access walkdowns by November 20, 2013.  
ENCLOSURE Description of Corrections and Replacement Pages for Monticello Nuclea'r Generating Plant's External Flooding Walkdown Report 3.0     Updated External Flooding Walkdown Report NSPM originally committed to complete the inspection of flood protection features identified in Table 3.6-3, "Restricted Access," of Reference 1 by October 31,2013. Any deficiencies identified as a result of the completion of these inspections will be provided to the NRC in an updated external flooding walkdown report. NSPM will submit an updated external flooding walkdown report with a summary of the results of the restricted access walkdowns by November 20, 2013.


==References:==
==References:==
: 1. NSPM Letter to NRC, "MNGP Final Response to NRC Request for Information Pursuant to 1 0 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated November 27,2012, ADAMS Accession No. ML12333A348.
: 1. NSPM Letter to NRC, "MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated November 27,2012, ADAMS Accession No. ML12333A348.
: 2. NRC Letter, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated March 12,2012, ADAMS Accession No. ML12053A340.
: 2. NRC Letter, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident,"
Page 3 of 3 ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report Attachment Replacement Pages for MNGP's External Flooding Walkdown Report (Markup) Page 23 Page 28 2 pages follow No. Description of Feature 1 Penetrations in Plant Administration Building (PAB) 939 Telephone Room 2 Windows in PAB Lunchroom 3 Conflict with steps in Procedure A.6 to protect tank T-44 4 Seal gap between the Intake Structure and access tunnel or between the tunnel and Turbine Building (Procedure A.6, Step 5.2.9.1) Table 3.6-1: Deficiency list Condition Actions Provides a path for flood Revise Procedure A.6 to water to enter the PAB remove pathway. Control Building.
dated March 12,2012, ADAMS Accession No. ML12053A340.
Provides a potential path Actions to mitigate effects for flood water to enter the from flood water could PAB Control Building.
Page 3 of 3
include, but are not limited to 1) replacing windows or 2) revising Procedure A.6 to include sandbag berm in PAB Control Buildin(:J.
 
Current step 5.2.11.8 is not Revise Procedure A.6 to in agreement with step clarify protection of tank 5.2.11.W regarding T-44. protection of tank T -44 if the ring levee option is not chosen. Successful completion of Revise Procedure A.6 to step 5.2.9.1 may not be provide improved method assured as currently of sealing the gap. written. --Monticello Nuclear Generating Plant External Flooding Walkdown Report CAP Action Anticipated Request No. Completion Date 01358177 February 15, 2013 01358177 February 15, 2013 01358177 February 15, 2013 01353929 February 15, 2013 Page 23 No. Location 18 Intake Structure Tunnel Extension Elev. 916' -West Wall 19 Intake Structure Elev. 916' (East Wall Tunnel Extension) 20 Reactor Building Elev. 935' -Steam Chase 21 Condenser Room (Turbine Building Elev. 911 ') 22 Condensate Resin Receiver Tank Room (Turbine Building Elev. 908') 23 Steam Jet Air Ejector Room (Turbine Building Elev. 911 ') 24 Condensate Demineralizer Area (Turbine Building Elev. 937') 25 Compressed Gas Storage Building 26 Diesel Fuel Oil Storage Tank (Elev. 930') Table 3.6-3: Restricted Access Description/Justification Work Order No. Conduit Penetrations  
ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report Attachment Replacement Pages for MNGP's External Flooding Walkdown Report (Markup)
/Install 466385, Task 11 Scaffolding  
Page 23 Page 28 2 pages follow
& Verify Conduit Penetrations Sealed. Inspect Open Conduit 466385, Task 27 Penetration.
 
Verify seal. Complete Inspection  
Monticello Nuclear Generating Plant External Flooding Walkdown Report Table 3.6-1: Deficiency list Description of                                                              CAP Action        Anticipated No.                                  Condition                   Actions Feature                                                                Request No. Completion Date 1  Penetrations in Plant  Provides a path for flood   Revise Procedure A.6 to     01358177      February 15, 2013 Administration Building water to enter the PAB       remove pathway.
/ Locked 466385, Task 26 High Radiation Area Complete Inspection  
(PAB) 939 Telephone    Control Building.
/ Locked 466385, Task 20 High Radiation Area Complete Inspection  
Room 2  Windows in PAB          Provides a potential path   Actions to mitigate effects 01358177      February 15, 2013 Lunchroom              for flood water to enter the from flood water could PAB Control Building.       include, but are not limited to 1) replacing windows or 2) revising Procedure A.6 to include sandbag berm in PAB Control Buildin(:J.
/ Locked 466385, Task 21 High Radiation Area Complete Inspection  
3  Conflict with steps in  Current step 5.2.11.8 is not Revise Procedure A.6 to     01358177      February 15, 2013 Procedure A.6 to        in agreement with step       clarify protection of tank protect tank T-44      5.2.11.W regarding           T-44.
/ Locked 466385, Task 22 High Radiation Area Complete Inspection  
protection of tank T -44 if the ring levee option is not chosen.
/ Locked 466385, Task 23 High Radiation Area Complete Inspection 466385, Task 25 Complete Inspection  
4  Seal gap between the    Successful completion of     Revise Procedure A.6 to     01353929      February 15, 2013 Intake Structure and    step 5.2.9.1 may not be     provide improved method access tunnel or        assured as currently         of sealing the gap.
/ 466385, Task 24 Confined Space Monticello Nuclear Generating Plant External Flooding Walkdown Report Remarks Install cap on conduit as needed. Conduit does not correspond to any known equipment.
between the tunnel and  written.
None. None. None. None. None. None. None. Page 28}}
Turbine Building (Procedure A.6, Step 5.2.9.1)
                                      - -
Page 23
 
Monticello Nuclear Generating Plant External Flooding Walkdown Report Table 3.6-3: Restricted Access No.          Location              Description/Justification   Work Order No.               Remarks 18  Intake Structure Tunnel        Conduit Penetrations /Install 466385, Task 11 Install cap on conduit as Extension Elev. 916' - West    Scaffolding & Verify Conduit                   needed.
Wall                          Penetrations Sealed.
19  Intake Structure Elev. 916'    Inspect Open Conduit           466385, Task 27 Conduit does not correspond (East Wall Tunnel              Penetration. Verify seal.                       to any known equipment.
Extension) 20  Reactor Building Elev. 935' -  Complete Inspection / Locked   466385, Task 26 None.
Steam Chase                    High Radiation Area 21  Condenser Room (Turbine        Complete Inspection / Locked   466385, Task 20 None.
Building Elev. 911 ')          High Radiation Area 22  Condensate Resin Receiver      Complete Inspection / Locked   466385, Task 21 None.
Tank Room (Turbine            High Radiation Area Building Elev. 908')
23  Steam Jet Air Ejector Room    Complete Inspection / Locked   466385, Task 22 None.
(Turbine Building Elev. 911 ') High Radiation Area 24  Condensate Demineralizer      Complete Inspection / Locked   466385, Task 23 None.
Area (Turbine Building Elev. High Radiation Area 937')
25  Compressed Gas Storage        Complete Inspection           466385, Task 25   None.
Building 26  Diesel Fuel Oil Storage Tank  Complete Inspection /         466385, Task 24   None.
(Elev. 930')                  Confined Space Page 28}}

Revision as of 20:03, 4 November 2019

Correction to the MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident
ML13092A055
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 03/29/2013
From: Schimmel M
Xcel Energy, Northern States Power Co
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
L-MT-13-032
Download: ML13092A055 (8)
v • d • e


Text

Xcel Energy@ Monticello Nuclear Generating Plant 2807 W. CR 75, Monticello Monticello, MN 55362 March 29, 2013 L-MT-13-032 10 CFR 50.54(f)

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

  • Monticello Nuclear Generating Plant Docket No. 50-263 Renewed Facility Operating License No. DPR-22 Correction to the MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

References:

1. NSPM Letter to NRC, "MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated November 27,2012, ADAMS Accession No. ML12333A348.
2. NRC Letter, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated March 12,2012, ADAMS Accession No. ML12053A340.

In Reference 1, the Northern States Power Company, a Minnesota corporation (NSPM),

d/b/a Xcel Energy, provided the results of the external flooding walkdowns performed at the Monticello Nuclear Generating Plant (MNGP). These results were provided to the NRC as a result of information requested per 10 CFR 50.54(f) in a letter dated March 12,2012 (Reference 2). During subsequent reviews of the flooding walkdown report, NSPM identified two items in the Reference 1 report that require correction.

They do not impact the original conclusion of the Reference 1 report that the external flooding program is effective.

The purpose of this letter is to provide replacement pages to correct the original report.

The enclosure to this letter provides a description of the corrections needed. The attachment to the enclosure contains the replacement pages for the report.

Document Control Desk Page 2 If there are any questions on these corrections, or if additional information is needed, please contact Ms. Jennie Eckholt, Licensing Engineer, at 612-330-5788.

Summary of Commitments This letter proposes the following new commitment and no revisions to existing commitments.

Regulatory Commitments Due Date NSPM will submit an updated external flooding walkdown November 20, 2013 report with a summary of the results of the restricted access walkdowns.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on March 29, 2013.

Mark A. Schimmel Site Vice President, Monticello Nuclear Generating Plant Northern States Power Company - Minnesota Enclosure cc: Administrator, Region III, USNRC Director, Office of Nuclear Reactor Regulation (NRR)

NRR Project Manager, MNGP, USNRC Senior Resident Inspector, MNGP, USNRC

ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report Page 1 of 3

ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report On March 12,2012, the NRC Staff issued Reference 2 to all NRC power reactor licensees and holders of construction permits in active or deferred status. Enclosure 4 of the March 12, 2012 letter contains specific Requested Actions, Requested Information, and Required Responses associated with Near-Term Task Force (NTTF)

Recommendation 2.3, Flooding. In Enclosure 4 of Reference 2, the NRC requested licensees to perform flooding walkdowns to verify that plant features credited in the current licensing basis (CLB) for protection and mitigation from external flood events are available, functional, and properly maintained. Northern States Power Company, a Minnesota corporation (NSPM), d/b/a Xcel Energy, provided the results of Monticello Nuclear Generating Plant's (MNGP) external flooding walkdowns in a letter with an enclosed report dated November 27,2012 (Reference 1).

During subsequent reviews of the Reference 1 flooding walkdown report, NSPM identified two items requiring correction.

  • Procedure Step Incorrectly Referenced
  • Building Incorrectly Classified as Locked High Radiation These corrections are described in more detail in the following sections. Two replacement pages are provided in the Attachment to this enclosure to correct the flooding walkdown report.

1.0 Procedure Step Incorrectly Referenced Item 3 in Table 3.6-1, "Deficiency List," of Reference 1 incorrectly references the procedure step 5.2.11.H of the MNGP procedure A.6, "Acts of Nature." The table should reference step 5.2.11.W. One replacement page (page 23) is provided in the attachment to this enclosure to correct the flooding walkdown report.

2.0 Building Incorrectly Classified as Locked High Radiation Areas or buildings which were not readily accessible during the flooding walkdowns were provided in Table 3.6-3, "Restricted Access," of Reference 1. Item number 25 of this table identified the Compressed Gas Storage Building as a locked high radiation area. However, it was identified during the work order planning process that the areas requiring inspection are not locked high radiation areas and are accessible during normal plant operations. NSPM has entered this issue into the Corrective Action Program, and will complete the walkdown of the Compressed Gas Storage Building by October 31, 2013 per the commitment in Reference 1. One replacement page (page 28) is provided in the attachment to this enclosure to correct the flooding walkdown report.

Page 2 of 3

ENCLOSURE Description of Corrections and Replacement Pages for Monticello Nuclea'r Generating Plant's External Flooding Walkdown Report 3.0 Updated External Flooding Walkdown Report NSPM originally committed to complete the inspection of flood protection features identified in Table 3.6-3, "Restricted Access," of Reference 1 by October 31,2013. Any deficiencies identified as a result of the completion of these inspections will be provided to the NRC in an updated external flooding walkdown report. NSPM will submit an updated external flooding walkdown report with a summary of the results of the restricted access walkdowns by November 20, 2013.

References:

1. NSPM Letter to NRC, "MNGP Final Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated November 27,2012, ADAMS Accession No. ML12333A348.
2. NRC Letter, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident,"

dated March 12,2012, ADAMS Accession No. ML12053A340.

Page 3 of 3

ENCLOSURE Description of Corrections and Attachment with Replacement Pages for MNGP's External Flooding Walkdown Report Attachment Replacement Pages for MNGP's External Flooding Walkdown Report (Markup)

Page 23 Page 28 2 pages follow

Monticello Nuclear Generating Plant External Flooding Walkdown Report Table 3.6-1: Deficiency list Description of CAP Action Anticipated No. Condition Actions Feature Request No. Completion Date 1 Penetrations in Plant Provides a path for flood Revise Procedure A.6 to 01358177 February 15, 2013 Administration Building water to enter the PAB remove pathway.

(PAB) 939 Telephone Control Building.

Room 2 Windows in PAB Provides a potential path Actions to mitigate effects 01358177 February 15, 2013 Lunchroom for flood water to enter the from flood water could PAB Control Building. include, but are not limited to 1) replacing windows or 2) revising Procedure A.6 to include sandbag berm in PAB Control Buildin(:J.

3 Conflict with steps in Current step 5.2.11.8 is not Revise Procedure A.6 to 01358177 February 15, 2013 Procedure A.6 to in agreement with step clarify protection of tank protect tank T-44 5.2.11.W regarding T-44.

protection of tank T -44 if the ring levee option is not chosen.

4 Seal gap between the Successful completion of Revise Procedure A.6 to 01353929 February 15, 2013 Intake Structure and step 5.2.9.1 may not be provide improved method access tunnel or assured as currently of sealing the gap.

between the tunnel and written.

Turbine Building (Procedure A.6, Step 5.2.9.1)

- -

Page 23

Monticello Nuclear Generating Plant External Flooding Walkdown Report Table 3.6-3: Restricted Access No. Location Description/Justification Work Order No. Remarks 18 Intake Structure Tunnel Conduit Penetrations /Install 466385, Task 11 Install cap on conduit as Extension Elev. 916' - West Scaffolding & Verify Conduit needed.

Wall Penetrations Sealed.

19 Intake Structure Elev. 916' Inspect Open Conduit 466385, Task 27 Conduit does not correspond (East Wall Tunnel Penetration. Verify seal. to any known equipment.

Extension) 20 Reactor Building Elev. 935' - Complete Inspection / Locked 466385, Task 26 None.

Steam Chase High Radiation Area 21 Condenser Room (Turbine Complete Inspection / Locked 466385, Task 20 None.

Building Elev. 911 ') High Radiation Area 22 Condensate Resin Receiver Complete Inspection / Locked 466385, Task 21 None.

Tank Room (Turbine High Radiation Area Building Elev. 908')

23 Steam Jet Air Ejector Room Complete Inspection / Locked 466385, Task 22 None.

(Turbine Building Elev. 911 ') High Radiation Area 24 Condensate Demineralizer Complete Inspection / Locked 466385, Task 23 None.

Area (Turbine Building Elev. High Radiation Area 937')

25 Compressed Gas Storage Complete Inspection 466385, Task 25 None.

Building 26 Diesel Fuel Oil Storage Tank Complete Inspection / 466385, Task 24 None.

(Elev. 930') Confined Space Page 28

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