ML14356A177

NRR E-mail Capture - River Bend Station, Unit 1, Request for Additional Information Regarding Heavy Loads

ML14356A177
Person / Time
Site:	River Bend
Issue date:	12/18/2014
From:	Wang A Plant Licensing Branch IV
To:	Burmeister B Entergy Nuclear Operations
References
TAC MF2495
Download: ML14356A177 (3)

Text

NRR-PMDAPEm Resource From: Wang, Alan Sent: Thursday, December 18, 2014 2:58 PM To: BURMEISTER, BARRY M; WILLIAMSON, DANNY H; Joseph Clark (JCLARK@entergy.com)

Cc: Burkhardt, Janet

Subject:

River Bend Station, Unit 1, Request for Additional Information Regarding Heavy Loads (TAC No. MF2495)

Barry, Danny, and Joey, By letter dated July 29, 2013 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML13214A334), as supplemented on September 23, 2014 (ADAMS Accession No. ML14272A180),

Entergy Operations, Inc. (Entergy, the licensee) submitted a license amendment request (LAR) to add a permanent exception to River Bend Station, Unit 1 (RBS) Technical Requirements Manual (TRM) Section 3.9.14, "Crane Travel - Spent and New Fuel Storage, Transfer, and Upper Containment Fuel Pools," to allow for movement of fuel pool gates over fuel assemblies for maintenance. This exception will also be described by revision to Updated Safety Analysis Report (USAR) Section 9.1.2.2.2, "Fuel Building Fuel Storage," and Section 9.1.2.3.3, "Protection Features of Spent Fuel. The US Nuclear Regulatory Commission (NRC) staff has reviewed the Entergy submittals, regarding changes to the TRM and UFSAR and has determined that the following additional information is required to complete its review of the amendment request:

Request for Additional Information (RAI)-1 to the letter dated September 23, 2014, included a description of the methodology used to determine the strike velocity and penetration potential of the gate and associated handling equipment, if dropped through air and/or water. The methodology used was from Topical Report BC-TOP-9A, Revision 2, September 1974, "Topical Report, Design of Structures for Missile Impact" (ADAMS Accession No. ML14093A217). The NRC Topical Report Evaluation included in the document states that the evaluation of punching shear effects due to impact was not included as part of the structural response considerations in the report, but should be addressed in the safety analysis report. Describe the configuration of the spent fuel pool floor liner and address the susceptibility of the liner to punching shear effects. Please note that NRC Information Notice 94-13, Supplement 2, Control and Oversight of Contractors during Refueling Activities and Clarification of Applicability of Section 50.120 of Title 10 of the Code of Federal Regulations to Contractor Personnel, describes the drop of a core shroud bolt that punched through the liner of a spent fuel pool at a U.S. reactor.

RAI-2

The analysis of the gate drop included in Attachment 2 to the letter dated September 23, 2014, treated the 2000 pound gate as a shallow box with dimensions of 24.39 ft in length, 4.771 ft in width, and 0.3958 ft in thickness. This treatment resulted in a determination that the gate density would be less than the density of water (see page 72 of Calculation G13.18.2.7-116 [Attachment 2 to the letter dated September 23, 2014]).

Explain the actual construction of the gate and, considering the sensitivity of the liner damage analysis to effective impact area, address the accuracy of the modeled configuration in predicting the potential for liner penetration.

This request was discussed with Mr. Danny Williamson of your staff on December 18, 2014, and it was agreed that a response would be provided within 60 days from the issuance of this email. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-1445 or via e-mail at Alan.Wang@nrc.gov.

Alan B. Wang 1

Project Manager (River Bend Station)

Nuclear Regulatory Commission Division of Operating Reactor Licensing 2

Hearing Identifier: NRR_PMDA Email Number: 1791 Mail Envelope Properties (C0A338EE37A11447B136119705BF9A3F022BD82672EC)

Subject:

River Bend Station, Unit 1, Request for Additional Information Regarding Heavy Loads (TAC No. MF2495)

Sent Date: 12/18/2014 2:57:55 PM Received Date: 12/18/2014 2:57:56 PM From: Wang, Alan Created By: Alan.Wang@nrc.gov Recipients:

"Burkhardt, Janet" <Janet.Burkhardt@nrc.gov>

Tracking Status: None "BURMEISTER, BARRY M" <BBURMEI@entergy.com>

Tracking Status: None "WILLIAMSON, DANNY H" <DWILL21@entergy.com>

Tracking Status: None "Joseph Clark (JCLARK@entergy.com)" <JCLARK@entergy.com>

Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 3534 12/18/2014 2:57:56 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: