2CAN089201, Forwards ANO Unit 2 PRA Summary Rept for Severe Accident Vulnerabilities, Per Generic Ltr 88-20

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: 2CAN089201, Forwards ANO Unit 2 PRA Summary Rept for Severe Accident Vulnerabilities, Per Generic Ltr 88-20 ML20141M563
References
2CAN089201, 2CAN89201, GL-88-20, TAC-M74377, NUDOCS 9209010212
Download: ML20141M558 (3)

Text

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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.

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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, Ijt [?NY 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.

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a E/ James SUBSCRIBED AND SWORN TO before me, a Notary Public in and for the County and State above named, this SM. day of _[ g ,

1992.

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l / Ndtary Public Hy Commission Expires:

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