ML14052A034
| ML14052A034 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/20/2014 |
| From: | David Loveless Division of Reactor Safety IV |
| To: | Jeremy G. Browning Entergy Operations |
| D. Loveless | |
| References | |
| IR-14-002 | |
| Download: ML14052A034 (5) | |
See also: IR 05000313/2014002
Text
February 20, 2014
Jeremy Browning, Site Vice President
Arkansas Nuclear One
Entergy Operations, Inc.
1448 SR 333
Russellville, AR 72802-0967
SUBJECT:
ARKANSAS NUCLEAR ONE - REQUEST FOR INFORMATION REGARDING
THE NRC INTEGRATED INSPECTION REPORT 05000313/2014002 AND
Dear Mr. Browning:
As part of an ongoing inspection related to the failure of Arkansas Nuclear Ones alternate AC
diesel generator, the Nuclear Regulatory Commission is continuing to conduct an evaluation of
the risk under the significance determination process.
In order to minimize the impact to your onsite resources and to ensure that the best available
information is used in our risk evaluation, we have enclosed a request for information needed
for the significance determination process. It is important that answers to our questions are
up-to-date and complete in order to ensure that Arkansas Nuclear One receives full credit for
the safety features of the plant in the significance determination.
We have discussed the schedule for this evaluation with your staff and understand that our
regulatory contact for this effort will be Stephenie L. Pyle. If there are any questions about
this inspection or the material requested, please contact me at (817) 200-1161,
(David.Loveless@nrc.gov).
This letter does not contain new or amended information collection requirements subject
to the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). Existing information
collection requirements were approved by the Office of Management and Budget, control
number 3150-0018. The NRC may not conduct or sponsor, and a person is not required to
respond to, a request for information or an information collection requirement unless the
requesting document displays a currently valid Office of Management and Budget control
number.
UNITED STATES
NUCLEAR REGULATORY COMMISSION
REGION IV
1600 E. LAMAR BLVD.
ARLINGTON, TX 76011-4511
J. Browning
- 2 -
In accordance with 10 CFR 2.390 of the NRCs Rules of Practice, a copy of this letter and its
enclosure will be available electronically for public inspection in the NRC Public Document
Room or from the Publicly Available Records (PARS) component of NRCs document system
(ADAMS). ADAMS is accessible from the NRC web site at http://www.nrc.gov/reading-
rm/adams.html (the Public Electronic Reading Room).
Sincerely,
/RA/
David P. Loveless
Senior Reactor Analyst
Division of Reactor Safety
Docket Nos.: 50-313, 50-368
Enclosure:
Arkansas Nuclear One Fire Scenarios - Request for Information
cc w/enclosure: Electronic Distribution for Arkansas Nuclear One
J. Browning
- 3 -
Regional Administrator (Marc.Dapas@nrc.gov)
Deputy Regional Administrator (Steven.Reynolds@nrc.gov)
DRP Director (Kriss.Kennedy@nrc.gov)
DRP Deputy Director (Troy.Pruett@nrc.gov)
Acting DRS Director (Jeff.Clark@nrc.gov)
Senior Resident Inspector (Brian.Tindell@nrc.gov)
Resident Inspector (Matt.Young@nrc.gov)
Resident Inspector (Abin.Fairbanks@nrc.gov)
Branch Chief, DRP/E (Greg.Werner@nrc.gov)
Senior Project Engineer, DRP/E (Michael.Bloodgood@nrc.gov)
Project Engineer, DRP/E (Jim.Melfi@nrc.gov)
ANO Administrative Assistant (Gloria.Hatfield@nrc.gov)
Public Affairs Officer (Victor.Dricks@nrc.gov)
Public Affairs Officer (Lara.Uselding@nrc.gov)
Project Manager (Michael.Orenak@nrc.gov)
Branch Chief, DRS/TSB (Ray.Kellar@nrc.gov)
ACES (R4Enforcement.Resource@nrc.gov)
RITS Coordinator (Marisa.Herrera@nrc.gov)
Regional Counsel (Karla.Fuller@nrc.gov)
Technical Support Assistant (Loretta.Williams@nrc.gov)
Congressional Affairs Officer (Jenny.Weil@nrc.gov)
RIV/ETA: OEDO (Ernesto.Quinones@nrc.gov)
R:\\_REACTORS\\_ANO\\2014\\ANO2014002-Rpt-DPL-140220.docx ML14052A034
ADAMS: No x Yes
x SUNSI Review Complete
Reviewer Initials: DPL
x Publicly Available
x Non-Sensitive
Non-publicly Available
Sensitive
PE:DRP/E
SRA:DRS/EB2
C:DRS/EB2
C:DRP/E
J. Melfi
D. Loveless
G. Miller
G. Werner
E: /RA/
/RA/
/RA/
/RA/
02/18/2014
02/20/2014
02/18/2014
02/19/2014
OFFICIAL RECORD COPY T=Telephone E=E-mail F=Fax
J. Browning
- 4 -
Enclosure
Arkansas Nuclear One Fire Scenarios - Request for Information
From:
David P. Loveless
Senior Reactor Analyst
(817) 200-1161
To:
Stephenie L. Pyle
Licensing Manager, Arkansas Nuclear One
(479) 858-4704
Subject: Information Request to Support Significance Determination
On February 13, 2014, Mr. Jason Hall of your organization provided an email forwarding a list of
445 postulated fire scenarios that result in a fire-initiated loss of offsite power. As stated in that
email, this represented an increase of 251 scenarios from a list previously provided by your
staff, because a logic gate in your probabilistic safety assessment model masked some of these
scenarios. As a result of the additional scenarios, and their higher associated fire ignition
frequencies, the previous screening method used to analyze the risk of the alternate ac diesel
generator overspeed trip issue no longer provides an acceptable bounding risk analysis. As a
result, we are requesting additional information.
The following information is requested in order to support ongoing significance determination
activities.
Requested Information
For each of the 445 postulated fire scenarios, please answer the following question:
Does the postulated fire in the scenario directly fail the function of the alternate ac
generator?
For each postulated fire scenario that does not directly affect the function of the
alternate ac diesel generator, please answer the following questions:
1. What is the characterization and limitations of the scenario?
2. What credit was given for suppression in the scenario?
3. Is the alternate ac generator specifically credited for success for the scenario?
4. What other front-line components were affected by the postulated fire besides offsite
power?
Inspector Contact Information:
David P. Loveless
(817) 200-1161
David.Loveless@nrc.gov