[Federal Register Volume 59, Number 183 (Thursday, September 22, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-23459]


[[Page Unknown]]

[Federal Register: September 22, 1994]


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NUCLEAR REGULATORY COMMISSION
 

Public Workshop on the Seismic Revisit of the Individual Plant 
Examination of External Events (IPEEE) for Severe Accident 
Vulnerabilities

AGENCY: Nuclear Regulatory Commission.

ACTION: Notice of workshop and availability of Draft NRC report on 
Seismic Revisit of Individual Plant Examination of External Events 
(IPEEE).

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SUMMARY: The NRC plans to conduct a workshop to discuss the results of 
the seismic IPEEE revisit and solicit questions and comments. A draft 
report on the staff position is being prepared and will be available on 
October 7, 1994 at the NRC Public Document Room (PDR), Gelman Building, 
2120 L Street NW., Washington, DC.

DATES: October 21, 1994; 9:00-5:00.

ADDRESSES: The NRC Auditorium, 11555 Rockville Pike, Rockville, MD 
20852-2738.

FOR FURTHER INFORMATION CONTACT:
John T. Chen, Office of Nuclear Regulatory Research, U.S. Nuclear 
Regulatory Commission, Washington, D.C. 20555. Telephone (301) 415-
6549.

SUPPLEMENTARY INFORMATION: On June 28, 1991 the NRC issued Generic 
Letter 88-20, Supplement 4, Individual Plant Examination of External 
Events (IPEEE) for Severe Accident Vulnerabilities, and NUREG-1407, 
Procedural and Submittal Guidance for IPEEE. The Generic Letter 
requested all licensees to perform an IPEEE to identify plant-specific 
vulnerabilities to severe accidents due to external events and report 
the results to the NRC. NUREG-1407 provides guidance for conducting the 
IPEEE. Key elements of the development of the IPEEE guidance included 
assigning earthquake review level and review scope for the seismic 
events. In this development, for central and eastern U.S. plants, the 
process of assigning plants to appropriate review categories has relied 
largely on the use of available seismic hazard results: those developed 
by Lawrence Livermore National Laboratory (LLNL) in 1989 and Electric 
Power Research Institute (EPRI) in 1989. However, grouping of the 
plants relied heavily on a grouping technique with a number of 
attributes using seismic hazard on a relative basis. In 1993, based on 
a re-elicitation of LLNL ground-motion and seismicity experts, revised 
seismic hazard results were issued in NUREG-1488. The revised mean 
hazard results are significantly lower than the 1989 LLNL results, and 
are much closer to the 1989 EPRI hazard results. These results prompted 
the NRC to revisit the seismic IPEEE program and consider the potential 
impact of the revised LLNL results. The Draft Report will be discussed 
during the workshop. A detailed agenda will be available on October 14, 
1994 at the PDR.
    Members of licensees' staff who are involved in seismic IPEEE 
performance are encouraged to attend, along with other interested 
members of the public. Those persons who wish to make a brief 
presentation at the workshop, should indicate their desire to the 
contact listed above, so that they can be added to the agenda. Early 
notification is recommended since requests will be processed as they 
are received. Written comments will also be accepted up to 4 weeks 
following the workshop.

    Dated in Rockville, Maryland this 15th day of September 1994.

    For the Nuclear Regulatory Commission.
Joseph Murphy,
Acting Director, Division of Safety Issue Resolution, Office of Nuclear 
Regulatory Research.
[FR Doc. 94-23459 Filed 9-21-94; 8:45 am]
BILLING CODE 7590-01-M