ML11125A075
| ML11125A075 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 05/05/2011 |
| From: | Mozafari B Plant Licensing Branch II |
| To: | Duncan R Carolina Power & Light Co |
| Mozafari B | |
| Shared Package | |
| ML11123A266 | List: |
| References | |
| RIS-06-004 | |
| Download: ML11125A075 (3) | |
See also: RIS 2006-04
Text
OFFICIAL USE ONLY
SENSITI\\'E UNCLASSIFIED INFORMATION
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D.C. 20555-0001
May 5,2011
Mr. Robert J. Duncan II
Vice President - Robinson Nuclear Plant
Carolina Power & Light Company
H. B. Robinson Steam Electric Plant,
Unit No.2
3581 West Entrance Road
Hartsville, South Carolina 29550
SUBJECT:
H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO.2 - REVIEW OF
PRELIMINARY ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF
MARCH 28, 2010 OPERATIONAL EVENT
Dear Mr. Duncan,
Enclosed for your review and comment is a copy of the preliminary results of an accident
sequence precursor (ASP) analysis of an operational event that occurred on March 28, 2010, at
the H. B. Robinson Steam Electric Plant, Unit No.2. In accordance with the U.S. Nuclear
Regulatory Commission (NRC) Regulatory Issue Summary 2006-24, "Revised Review and
Transmittal Process for Accident Sequence Precursor Analyses," this event is a higher-risk
event; and therefore, a review by the licensee is requested.
In assessing operational events, the NRC staff strives to make the ASP models as realistic as
possible regarding the specific features and response of a given plant to various accident
sequence initiators. We realize that licensees may have additional systems and emergency
procedures, or other features at their plants that might affect the analysis. Therefore, we are
providing you an opportunity to review and comment on the technical adequacy of the
preliminary ASP analysis, including the depiction of plant equipment and equipment capabilities.
Upon receipt and evaluation of your comments, we will revise the conditional core damage
probability calculations where necessary to consider the specific information you have provided.
The object of our review process is to provide as realistic an analysis of the significance of the
event as possible.
In order for us to incorporate your comments, perform any required reanalysis, and prepare the
final report of our analysis in a timely manner, you are requested to complete your review and to
provide any comments within 60 calendar days from the date of this letter. As soon as our final
analysis of this event has been completed, we will provide for your information the final ASP
analysis and the resolution of your comments.
Document transmitted herewith
contains sensitive unclassified
information. When separated from
the enclosure, this document is
decontrolled.
OFFICIAL USE ONLY - SENSITI't'E UNCLASSIFIED INFORMATION
Of-fICIAL USE ONLY
SENSITIVE UNGl=ASSIFIED INFORMATION
R. Duncan
2
This request is covered under the provisions of the Paperwork Reduction Act of 1995 by the
Office of Management and Budget control number 3150-0104 for NRC staff followup reviews of
events documented in licensee event reports. Your response to this request is voluntary and
does not constitute a licensing requirement.
The enclosed preliminary ASP analysis is predecisional material and, therefore, not publicly
available. The document must be distributed only to those who have a need-to-know to conduct
official business. When completed, the final ASP analysis will be publicly released.
If you have any questions regarding the analysis, please contact me at 301-415-2020.
Sincerely,
- 2~ *L£ £- s
- (. ,
Io~ Brenda L. Mozafari, Senior Project Manager
Plant Licensing Branch 11-2
Division of Operating Reactor Licensing
Office of Nuclear Reactor Regulation
Docket No. 50-261
Enclosure: As stated (Non-Public)
cc w/o encl: Distribution via ListServ
9FFICIAl USE ONLY
SENSITIVE UNCLASSIFIED INFORMATION
OFFICE
LPL2-2/PM
LPL2-2/LA
LPL2-2/BC
LPL2-2/PM
NAME
BMozafari
(FSaba for)
CSoia
DBroaddus
BMozafari
(FSaba for)
DATE
05/05/11
05/05/11
05/05/11
05/05/11