2CAN089201, Forwards ANO Unit 2 PRA Summary Rept for Severe Accident Vulnerabilities, Per Generic Ltr 88-20
| ML20141M558 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/28/1992 |
| From: | James Fisicaro ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20141M559 | List: |
| References | |
| 2CAN089201, 2CAN89201, GL-88-20, TAC-M74377, NUDOCS 9209010212 | |
| Download: ML20141M558 (3) | |
Text
7 s
9m; 2:o n,,.
Ente ca"= * *"'"' '"'
Fore 3, Eb 137G ~
Opera ons ww -
w sat s &3100 August 28, 1992-2CAN085201 U. S. Nutlear Regulatory Commission.
Document Control Desk-Mail St'ation P1-137 Wr.shington, DC 20555
Subject:
= Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No.-NP' 6 Individual Plant Examination for Severo Accident Vulnerabilities -
Generic Letter 88-20 (TAC _No. M74377)
Gentlemen:
By NRC Ger.oric Latter (GL) 88-20 dated November 23, ':1988 (OCNA118827),
licensees were requested to perform an Individual Plant fxamination (IPE) for anvere accident vulnerabilities - and o submit - the results to the NRC.
By 'let ter dated ' March 13, 1992 ~ (OCAN039204), Entergy _ Operations atf g
Arkansas Nuclear One ( ANO) -informed the Staff. that we would complete - the IPE for ANO-2 and submit the results by[ August 31, 1992 Enclosed is the ANO-2 Probabilistic Risk. Assessment (PRA) summary report as required by GL ' 88-20, IPE for Severd Accident ' Vulnerabilities. ' -The.
IPE scope included a Level I PRA, a limited Level II PRA, and-an' internal:
- i flooding analysis.
Objectives for 'the ANO-2 -IPE were established consistent with L GL 20 and the submittal-l guidance-of L NUREG-1335.
Entergy Operations' personne1' were. involved.:In_. all aspects _of the
~
development, quantification~,- and documentation?of the PRA models used Jin the ANO-2 IPE..Entergy Operations' perso;mel also contribtited well'over
-50% of the total engineering effort.(approximately 8_ person-years) to the project.
As a-result, the 7PE provided a ' comprehencive, dctalled analysis-of the -
severe accident behavior _ for-ANO-2 and quantifled ithe: overall> likelihood y
of ' core. damage. and f tssion - product - release. -
The !:IPE results show -- no
~ indication that any plant unique severe accident vulnerabilities exist _ati.
ANO-2, and no plant unique modifications.:are deemed ' necessary hased on.
.the results of.our evaluation..The overall core.. damage frequency of 3.<e
.x;10**lper
<tr is'below the-NRC's Severe \\ccident'Po. icy' Statement _ goal.
of less tt - IL x.10-' per-. reactor ' year and is ; consistent : with - other PWR '
-PRAs.
TL pot'ential for early (relative to core damage) _ large _of f-sits -
releases was concervatively determined to exist ~for 6.9%-of the core melti
. frequency. -The ANO-2 IPE also estimates. the ' risk-for. Unresolved Safety Issue A-45, Generic Issue (GI)-23, and-GI-105 which are discussed -in the enclosed summary report.
4
' llc
O. S. NRC August 28, 1992-Page 2 Alt. hough no plant specific vulnerabilities hnve been identified, a number of. insights have been gained. pertaining to. sensitive-plant features-(i.e., areas where changes can have significant impact on plant risk) and.
regarding areas of potential plant improvement. (both procedural - and hardware).
These areas are also discussed : in detail in the attached report.
This information is being provided to you under affirmation pursuant to 10CFR50. 54( f).
If you have any further questions, please do not besitat e to contact me or my staff.
Very truly ours, I [?NY jt v}^JaesJ['isicato D rect
- Licensing JJF/NDM/ jf Enclosure cc
Mr. James h. Milhoan U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 NRC Senior Resident Inspector Arkansas Nuclear One - ANO-1 & 2 Number 1, Nuclear Plant Road Russellville, Ah 72801 Mr. Thomas W. Alexion NRR Project Manager, Region IV/ANO-1 U. S. Nuclear Regulatory Commission NRR Hai? Stop 13-11-3 One White Flint North
'11555 Rockville Pike Rockville, Maryland 20852----
Ms. Sheri R Peterson NRR Project Manager, Region.IV/ANO-2 U. S. Nuclear Regulatory Commission NRR Mall Stop_13-11-3 One' White Flint North 11555 Rockville Pike Rockville, Maryland 20852 I
a STATE OF ARKANSAS
)
)
SS COUNTY,OF LOGAN
)
Affirmation l
- 1. Dale E. James, bning duly sworn, subscribe to and say that I am l
Supervisor, Licensing at ANO for Entergy Operations, that I have full authority to execute this a f firmation; that I have read the document numbered 2CAN089201 and know the contents thereof; and that to the best of y knowledge, information and belief the statements in it are true.
d W
?
/
E/ James a
SUBSCRIBED AND SWORN TO before me, a Notary Public in and for the County and State above named, this SM. day of _[
g 1992.
l JLllff,
4 /M$4 'r &
l
/ Ndtary Public Hy Commission Expires:
7dat, 2000 1
l y
t
{
l l
l l
l l
~-
..