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

From kanterella
(Redirected from ML13092A055)
Jump to navigation Jump to search

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)


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