August 22, 2003

MEMORANDUM TO: Michael T. Lesar, Chief

Rules and Directives Branch

Division of Administrative Services

Office of Administration

FROM: Joseph G. Giitter, Acting Branch Chief / RA /

Probabilistic Risk Analysis Branch

Division of Risk Analysis and Applications

Office of Nuclear Regulatory Research

SUBJECT: PUBLICATION OF NOTICE FOR COMMENT ON NUREG/CR-6595

REVISION 1, “AN APPROACH FOR ESTIMATING THE FREQUENCIES

OF VARIOUS CONTAINMENT FAILURE MODES AND BYPASS

EVENTS, DRAFT REPORT FOR COMMENT” IN THE FEDERAL

REGISTER

Please publish the attached notice for public comment and availability provided in the

attachment on NUREG/CR-6595 Revision 1, “An Approach for Estimating the Frequencies of

Various Containment Failure Modes and Bypass Events, Draft Report for Comment” in the

Federal Register. The attachment includes the signed original, 4 copies of the notice, and a 

diskette with the notice on it in WordPerfect.

Attachment: As stated

Distribution:

WDean, EDO AThadani, RES SNewberry, RES MCunningham, RES

PBaranowsky, RES MDrouin, RES WBrochardt, NRR MTschiltz, NRR

MReinhart, NRR SRichards, NRR GParry, NRR PRAB r/f

MFields, NRR MSnodderly, ACRS DRAA r/f D. O’Neal r/f

C:\ORPCheckout\FileNET\ML032370084.wpd

August 22, 2003 (10:20AM)

DISTRIBUTION: DRAA r/f, PRAB r/f, D. O’Neal

OAR in ADAMS? (Y or N) Y ADAMS ACCESSION NO.: TEMPLATE NO. RESPublicly Available? (Y or N) Y DATE OF RELEASE TO PUBLIC SENSITIVE? N 

To receive a copy of this document, indicate in the box: "C" = Copy without attachment/enclosure "E" = Copy with

attachment/enclosure "N" = No copy

OFFICE DRAA/PRAB DRAA/PRAB DRAA/PRAB

NAME D. O’Neal* H. Hamzehee* J. Giitter*

DATE 8 / 13 /2003 8 / 15 /2003 8 / 22 /2003
2

15.10 Notice of availability.

[7590-01-P]

NUCLEAR REGULATORY COMMISSION

NUREG/CR-6595, Revision 1, An Approach for Estimating the Frequencies of Various

Containment Failure Modes and Bypass Events, Draft Report for Comment

AGENCY: Nuclear Regulatory Commission.

ACTION: Announcement of issuance for public comment, availability.

SUMMARY: The Nuclear Regulatory Commission has issued for public comment a document

entitled: NUREG/CR-6595 Revision 1, “An Approach for Estimating the Frequencies of Various

Containment Failure Modes and Bypass Events, Draft Report for Comment”. 

DATES: Please submit comments by October 31, 2003. Comments received after this

date will be considered if it is practical to do so, but the NRC staff is able to ensure consideration

only for comments received on or before this date.

ADDRESSES: NUREG/CR-6595 Revision 1, “An Approach for Estimating the Frequencies of

Various Containment Failure Modes and Bypass Events, Draft Report for Comment” is available

for inspection and copying for a fee at the NRC Public Document Room, Public File Area O1-

F21, 11555 Rockville Pike, Rockville, Maryland. Publically available documents created or

received at the NRC after November 1, 1999, are available electronically at the NRC’s Electronic
3

Reading Room at http://www.nrc.gov/reading-rm/adams.html. From this site, the public can gain

entry into the NRC’s Agencywide Document Access and Management System (ADAMS), which

provides text and image files of NRC’s public documents. If you do not have access to ADAMS

or if there are problems in accessing the documents located in ADAMS, contact the NRC Public

Document Room (PDR) Reference staff at 1-800-397-4209, 301-415-4737 or by email to

pdr@nrc.gov.

A free single copy of NUREG/CR-6595 Revision 1, “An Approach for Estimating the

Frequencies of Various Containment Failure Modes and Bypass Events, Draft Report for

Comment”, to the extent of supply, may be requested by writing to Office of the Chief

Information Officer, Reproduction and Distribution Services Section, U.S. Nuclear Regulatory

Commission, Printing and Graphics Branch, Washington, DC 20555-0001; facsimile: 301-415-

2289; e-mail: DISTRIBUTION@nrc.gov.

Please submit comments to Chief, Rules and Directives Branch, Office of Administration,

U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001. You may also deliver

comments to 11545 Rockville Pike, Rockville, Maryland, between 7:30 a.m. and 4:30 p.m.

Federal workdays, or email to: NRCREP.gov.

FOR FURTHER INFORMATION CONTACT: Daniel O’Neal, Division of Risk Analysis and

Applications, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission,

 Washington, DC 20555-0001. Telephone: 301-415-4146, e-mail: dmo@nrc.gov.
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SUPPLEMENTARY INFORMATION: NUREG/CR-6595 Revision 1, “An Approach for Estimating

the Frequencies of Various Containment Failure Modes and Bypass Events, Draft Report for

Comment” incorporates updated information and expands on the NUREG/CR-6595 report,

published in January 1999. The updated full power analyses take into account recent direct

containment heating studies and information gathered from the Individual Plant Examination

Level 2 studies. In addition, a new chapter provides event trees which reflect containment

insights for shutdown conditions.

Dated at Rockville, Maryland, this day of 2003.

FOR THE NUCLEAR REGULATORY COMMISSION.

_________________________________

Scott F. Newberry, Director

Division of Risk Analysis and Applications 

Office of Nuclear Regulatory Research