ML14162A371
| ML14162A371 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/26/2014 |
| From: | Peter Bamford Plant Licensing Branch IV |
| To: | |
| Bamford P | |
| References | |
| TAC MF3659, TAC MF3660 | |
| Download: ML14162A371 (4) | |
Text
LICENSEE:
FACILITY:
SUBJECT:
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 June 26, 2014 Entergy Operations, Inc.
Arkansas Nuclear One, Units 1 and 2
SUMMARY
OF MAY 22,2014, TELECONFERENCE MEETING WITH ENTERGY OPERATIONS, INC., REGARDING NEAR-TERM TASK FORCE RECOMMENDATION 2.1 FLOOD HAZARD REEVALUATION SCHEDULE EXTENSION REQUEST, ARKANSAS NUCLEAR ONE, UNITS 1 AND 2 (TAC NOS. MF3659 AND MF3660)
On May 22, 2014, a Category 1 teleconference public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Entergy Operations, Inc.
(Entergy, the licensee), at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of the teleconference meeting was to discuss the licensee's proposed schedule extension for completion of a flood hazard reevaluation at Arkansas Nuclear One, Units 1 and 2, requested by the NRC, by letter dated March 12, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12053A340). The extension request was submitted on March 12, 2014 (ADAMS Accession No. ML14071A459),
and was supplemented by letter dated April14, 2014 (ADAMS Accession No. ML14105A366).
The proposed extension for completion of the flood hazard reevaluation would be from an original date of March 12, 2014, to a date 6 months after receipt of certain input data from the U.S. Army Corps of Engineers (USACE). A list of attendees is provided in the enclosure.
Highlights from this meeting on May 22, 2014, include the following:
The NRC staff stated that the purpose for the call was for gathering information on the proposed extension only. The NRC staff stated that holding the meeting did not imply approval or disapproval of any of the methods used by the licensee, nor would a decision regarding the proposed extension be made during the meeting.
To date, the licensee has evaluated all hazard mechanisms except for flooding from upstream dam failure. Results of the re-evaluation performed to date indicate that flooding height is below the current licensing basis (CLB). In other words, according to the licensee, local intense precipitation results do not trigger an Integrated Assessment, and interim actions are not needed at this time.
The NRC staff noted that over one-half of the extension period (3.5 months) is for report evaluation, review, and approval. The licensee stated that it might be possible to shorten this time by performing some steps in parallel versus in series; however, it would be difficult to determine if that is feasible at this time.
The licensee proposed determining the hydrostatic/hydrodynamic forces on its inundated structures using results from a one-dimensional (1-D) model. The NRC staff questioned this approach and asked if conservative velocities, such as river centerline velocities, would be used. The licensee stated that it would use a conservative result from its model(s).
The NRC staff asked about the potential need for a 2-D model. The licensee expressed the view that this level of model is not necessary given the results and that use of bounding modeling results and standard guidelines like American Society of Civil Engineers (ASCE) 7-1 0 should be sufficient to conservatively analyze the building loads during the flooding event.
The licensee stated that its schedule assumes results from the USAGE that are approximately the same as the water depths and velocities it has generated to date. The licensee also stated it expects the final water height result to be within its CLB.
One member of the public was in attendance for the teleconference meeting and no public meeting feedback forms were submitted.
Please direct any inquiries to me at 301-415-2833 or at Peter. Bamford@nrc.gov.
Docket Nos. 50-313 and 50-368
Enclosure:
List of Attendees cc w/encls: Distribution via Listserv fl?C:c~~~
Peter Bamford, Proj t Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
LIST OF ATTENDEES MAY 22. 2014. TELECONFERENCE MEETING WITH ENTERGY OPERATIONS. INC.
NEAR-TERM TASK FORCE RECOMMENDATION 2.1 FLOOD HAZARD REEVALUATION SCHEDULE EXTENSION REQUEST NAME ARKANSAS NUCLEAR ONE. UNITS 1 AND 2 DOCKET NOS. 50-313 AND 50-368 ORGANIZATION Peter Bamford Chris Cook Nuclear Regulatory Commission (NRC)
NRC Ken See Ed Miller Rob Kuntz Fernando Ferrante Natalie Mosher Don Bentley Dale James Stephenie Pyle Bryan Ford Steve Saunders Dan Brown Cindy Fasano Carrington Dillon David Leone Christine Stonier Steve Osting NRC NRC NRC NRC Entergy Entergy Entergy Entergy Entergy Entergy AREVA AREVA AREVA Goldberg-Zoino & Associates (GZA)
GZA Public Enclosure The licensee proposed determining the hydrostatic/hydrodynamic forces on its inundated structures using results from a one-dimensional (1-D) model. The NRC staff questioned this approach and asked if conservative velocities, such as river centerline velocities, would be used. The licensee stated that it would use a conservative result from its model(s).
The NRC staff asked about the potential need for a 2-D model. The licensee expressed the view that this level of model is not necessary given the results and that use of bounding modeling results and standard guidelines like American Society of Civil Engineers (ASCE) 7-10 should be sufficient to conservatively analyze the building loads during the flooding event.
The licensee stated that its schedule assumes results from the USAGE that are approximately the same as the water depths and velocities it has generated to date. The licensee also stated it expects the final water height result to be within its CLB.
One member of the public was in attendance for the teleconference meeting and no public meeting feedback forms were submitted.
Please direct any inquiries to me at 301-415-2833 or at Peter.Bamford@nrc.gov.
Docket Nos. 50-313 and 50-368
Enclosure:
List of Attendees IRA/
Peter Bamford, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation cc w/encls: Distribution via Listserv DISTRIBUTION:
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