Table 1. Comparison of Earthquake Levels Developed

DOE-STD-1024-92

EH-6

The development and utilization of Uniform Hazard Spectra can be enhanced

by a workshop involving the various DOE sites. The extent to which the

NEHRP Uniform Hazard Spectra can be utilized by DOE sites should be

included on the agenda.

Table 1

Comparison of Earthquake levels developed by the DOE SWG, March 19, 1992,

Draft and those developed by TERA, Inc. (included in UCRL-15910) and the

National Earthquake Hazard Reduction Program 1991 Provisions) at the 2E-3 level.

NEHRP 1991 (3)

Site

Proposed Interim (1)

TERA (2)

Provisions

Savannah River

0.06

0.08

0.10

Oak Ridge

0.09

0.15

0.10

Brookhaven

0.06

0.12

0.10

Portsmouth

0.03

0.08

0.05

Princeton

0.08

0.13

0.10

(1)

Reference 1 of this letter.

(2)

UCRL-53582, Rev. 1, Natural Phenomena Hazards Modeling Project: Seismic

Hazard Models for Department of Energy Sites, 1984 (Compilation of 25

TERA, Inc. seismic hazard studies)

(3)

National Earthquake Hazard Reduction Program Recommended Provisions

for the Development of Seismic Regulations for New Buildings, Building

Seismic Safety Council 1991.

RW-1

The subject draft interim DOE-wide position on the use of LLNL and EPRI

probabilistic seismic hazard curves has been reviewed by the Office of Civilian

Radioactive Waste Management (RW-1). The dilemma of using either the LLNL

method or the EPRI method for nuclear facility design has been debated since the

early 1980's. The draft does a suitable job of combining the separate approaches

developed by LLNL and EPRI for probabilistic analysis of seismic hazards for areas

east of 104W (the Rocky Mountain front area). Results of the method recommended

in the Interim Position appear reasonable for the various exempt sites provided in

the report. The correction factors utilized in the Interim Position for recognizing

uncertainty are appropriately conservative for this initial effort.

A-18