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| | issue date = 11/24/2015 | | | issue date = 11/24/2015 |
| | title = 11/18/2015, Summary of Conference Call Confirming Staff Understanding of Basis for Closing Open Item in Grand Gulf Reevaluated Flood Hazard Staff Assessment of Response to 10 CFR 50.54(f) Information Request- Flood Causing Mechanism Reevalu | | | title = 11/18/2015, Summary of Conference Call Confirming Staff Understanding of Basis for Closing Open Item in Grand Gulf Reevaluated Flood Hazard Staff Assessment of Response to 10 CFR 50.54(f) Information Request- Flood Causing Mechanism Reevalu |
| | author name = Marshall M L | | | author name = Marshall M |
| | author affiliation = NRC/NRR/JLD | | | author affiliation = NRC/NRR/JLD |
| | addressee name = Shams M K | | | addressee name = Shams M |
| | addressee affiliation = NRC/NRR/JLD | | | addressee affiliation = NRC/NRR/JLD |
| | docket = 05000416 | | | docket = 05000416 |
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Category:Memoranda
MONTHYEARML24297A6392024-10-30030 October 2024
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Quarterly Report on the Status of Public Petitions Under Title 10 of the Code of Federal Regulations, Section 2.206 - April 1 to June 30, 2019
ML19204A1492019-07-16016 July 2019
FEMA Region IV Memo 07-16-19: Hurricane Barry Preliminary Capabilities Assessment
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FEMA Region VI Memo 07-15-19: Hurricane Barry Preliminary Capabilities Assessment
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Safety Evaluation Input for Grand Gulf Nuclear Station Unit 1, License Amendment Request to Implement Technical Specification Task Force-425, Revision 3, Relocate Surveillance Frequencies to Licensee Control
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Cancelling Numerous Inspection Report Numbers
ML16287A5902016-11-17017 November 2016
Renewal of Full-Power Operating Licenses for Grand Gulf Nuclear Station Unit 1 (TAC No. ME7493)
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Communications Plan Regarding the Renewal of the Grand Gulf Nuclear Station Unit 1, Operating License
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License Renewal Application
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Advisory Committee on Reactor Safeguards Review of the Grand Gulf Nuclear Station, Unit 1, License Renewal Application - Transmittal of Final Safety Evaluation Report
ML16088A2042016-03-28028 March 2016
Memo T Bowers from s Ruffin, Technical Assistance Requests - Review 2015 Tri-Annual Decommissioning Funding Plans for Multiple Independent Spent Fuel Storage Installations W/ Encl 2 (Template)
ML16088A2052016-03-28028 March 2016
Enclosure 1 - (72.30 DFP Reviews to Be Completed 2015) - Memo T Bowers from s Ruffin, Technial Assistance Requests - Review 2015 Tri-Annual Decommissioning Funding Plans for Multiple Independent Spent Fuel Storage Installations
ML15324A0862015-11-24024 November 2015
Summary of Conference Call Confirming Staff Understanding of Basis for Closing Open Item in Grand Gulf Reevaluated Flood Hazard Staff Assessment of Response to 10 CFR 50.54(f) Information Request- Flood Causing Mechanism Reevaluation
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Issuance of Amendment Request for Changing Five Technical Specifications Allowable Values
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Summary of Telephone Conference Call Held on August 29, 2012, Between the NRC and Entergy, Concerning RAI Pertaining to the Grand Gulf Nuclear Station, LRA
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Draft Information Memo - May 1, 2005 Thru May 27, 2005
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Draft Information Memo for April 1, 2004 to April 30, 2004 - Marilyn R. Wohl
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Draft Information Report for October 3, 2003, to November 24, 2003
2024-05-08
[Table view] |
Text
November 24, 2015
MEMORANDUM TO: Mohamed K. Shams, Chief Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation
FROM: Michael L. Marshall, Jr., Senior Project Manager
/RA/ Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF CONFERENCE CALL CONFIRMING STAFF UNDERSTANDING OF BASIS FOR CLOSING OPEN ITEM IN THE GRAND GULF NUCLEAR STATION, UNIT 1 REEVALUATED FLOOD HAZARD STAFF ASSESSMENT OF RESPONSE TO 10 CFR 50.54(f)
INFORMATION REQUEST - FLOOD-CAUSING MECHANISM REEVALUATION (CAC NO.
MF1102)
On November 18, 2015, U.S. Nuclear Regulatory Commission (NRC) staff from the Japan Lessons-Learned Division in the Office of Nuclear Reactor Regulation and from the Division of Site Safety and Environmental Analysis in the Office of New Reactors spoke with representatives from Entergy Operations, Inc. (the licensee) to confirm the staff's understanding of activities by the licensee that would resolve an open item in staff assessment of the licensee's reevaluation of the flooding hazard at Grand Gulf Nuclear Station, Unit 1 (Grand Gulf). Specifically, the open item concerned proposed blockage assumptions concerning 4-foot culverts and vehicle barrier openings. The participants in the conference call are listed in Enclosure 1 to this memorandum.
BACKGROUND By letter dated March 12, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12053A340), the NRC iss ued a request for information pursuant to Title 10 of the Code of Federal Regulations, Section 50.54(f) (hereafter referred to as the 50.54(f) letter). The request was issued as part of implementing lessons learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 2 to the 50.54(f) letter requested licensees to reevaluate flood-causing mechanisms using present-day methodologies and guidance. By letter dated March 11, 2013 (ADAMS Accession No. ML13071A457), the licensee responded to this request for Grand Gulf Nuclear Station, Unit 1. In response to NRC staff questions, this response was supplemented by letter dated January 9, 2014 (ADAMS Accession No. ML14014A277). By letter dated November 25, 2014, the NRC staff sent the licensee a staff assessment of the information provided. However the staff assessment included three open items, including the following open item:
Justify the proposed blocking assumptions on the onsite drainage system (e.g.,
supported by proposed maintenance and flood protection measures implemented
through emergency procedures or administrative controls) consistent with the Integrated Assessment interim staff guidance (NRC, 2012c). In particular, the licensee is requested to justify the assumed 50 percent blockage of the 4-foot culverts and 30 percent blockage for vehicle barrier openings.
Subsequent to issuance of the staff assessment, the NRC staff realized that the licensee likely had in place practices, which would be documented in procedures that would support the licensee's blockage assumption. In order to confirm the basis for closing the open item, the NRC staff requested a telephone conference with the licensee to verify the staff's understanding of the practices in place that would support the licensee's blocking assumptions.
DISCUSSION During the conference call the licensee confirmed the staff's understanding that inspections are included in procedures for verifying that culvert and vehicle barrier openings are clear of debris. The visual inspections of the culverts are described in the licensee's surveillance procedure 06-TE-1000-V-0001, Revision 101, "CURVERT NO. 1 EMBANKMENT STABILITY/SURVEY" (see Attachment 2). The visual inspections of the vehicle barrier openings are described in the licensee's off-normal event procedure 05-1-02-VI-2, Revision 128, "HURRICANES, TORNADOES, AND SEVERE WEATHER" (see Enclosure 2). Both of these procedures describe how the licensee will implement periodic surveillances, as well as surveillances before and after intense precipitation events.
In addition to confirming the NRC staff's pr ior understanding, the licensee described the immediate area around the culverts and vehicle barrier openings. In particular, the licensee clarified that security screens discussed in staff's issued staff assessment only pertain to the 15-
ft diameter culverts, not the 4-ft diameter culverts. The licensee discussed how there is no historical evidence of blockage during past intense weather events, and that trees around several of the drainage canals had been cut-down and removed to further lessen the chance for leaf debris or fallen trees to block or clog the canals. The licensee, also, discussed how weather forecasts and alerts are transmitted to operators at the site. In addition to privately-operated weather services, the licensee discussed how they receive and monitor weather alerts issued by National Oceanic and Atmospheric Administration's National Weather Service.
Based on the confirmation of the NRC staff's prior understanding, the NRC staff informed the licensee that it had sufficient information to now close the open item. The NRC staff informed the licensee that the NRC staff would document the closure of the open item in a supplement to
the staff assessment.
Docket No. 50-416
Enclosures:
- 1. List of Conference Call Participants
- 2. Bentley, Donald E., Entergy Operations, Inc., email to Hall, Victor, U.S. Nuclear Regulatory Commission, November 18, 2015.
Enclosure 1 CONFERENCE CALL PARTICIPANTS November 18, 2015
Name Organization Hosung Ahn U. S Nuclear Regulatory Commission (NRC) Don Bentley Entergy Operations, Inc. (Entergy)
Dan Brown Areva Andy Campbell NRC Chris Cook NRC Victor Hall NRC Fred Hopkins Entergy
Tori Liggans-Robinson Entergy Michael Marshall NRC Aida Rivera-Varona NRC Enclosure 2
ML15324A086 *via email OFFICE NRR/JLD/JHMB/PM NRR/JLD/JHMB/PM NRR/JLD/LA NAME MMarshall VHall SLent DATE 11/23/2015 11/23/2015 11/23/2015 OFFICE NRO/DSEA/RHM/BC NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME CCook* MShams MMarshall DATE 11/23/2015 11/24/2015 11/24/2015
