ML20058A786
| ML20058A786 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 11/18/1993 |
| From: | Link B WISCONSIN ELECTRIC POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-93-125 GL-88-20, TAC-M83661, TAC-M83662, VPNPD-93-199, NUDOCS 9312010239 | |
| Download: ML20058A786 (2) | |
Text
7
.o Wisconsin Electnc POWER COMPANY 231 W McNgon PO Box 2046. Mdwoukee WI 53201-2046
[414)221 2345 VPNPD-93-199 NRC 125 November 18, 1993 Document Control Desk U.S.
NUCLEAR REGULATORY COMMISSION Mail Station P1-137 Washington, DC 20555 Gentlemen:
DOCKETS 50-266 AND 50-301 GENERIC LETTER 88-20. SUPPLEMENT 4.
INDIVIDUAL PLANT EXAMINATION FOR EXTERNAL EVENTS (TACS M83661 AND M83662)
POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 In response to a Wisconsin Electric (WE) letter to you dated l
September 8, 1993, Mr. Anthony T.
Gody Jr. provided WE with a copy of the recomputed 1993 Lawrence Livermore National Laboratory (LLNL) seismic hazard curves for the Point Beach Nuclear Plant site.
WE committed to evaluate these'new curves and to respond to you concerning which set of seismic hazard curves (new LLNL or EPRI) we intended to use in the seismic probabalistic safety assessment (PSA) of Point Beach.
The PSA is being used to resolve the seismic portion of the Point Beach Individual Plant Examination i
of External Events (IPEEE) for Severe Accident Vulnerabilities (Generic Letter 88-20, Supplement 4).
g We have completed our evaluation of the new LLNL seismic hazard curves.
As a result of our evaluation, it is our intention to use the 1989 LLNL median uniform hazard spectral shape for the 10,000 year return period earthquake as input for the PBNP seismic PSA.
This spectral shape will be used in conjunction with the mean (arithmetic) peak ground accelerations for both the new 1993 LLNL and EPRI results as the hazard parameter to compute the seismic core damage frequency.
This is consistent with the requirements of NUREG-1407, " Procedural and Submittal Guidance for the Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities."
However, it does represent a change in our 9312010239 931118 pc \\
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- previous position of using the only the EPRI results for both the spectral shape and peak ground acceleration.
We believe that this addresses your concern on this issue.
We would be pleased to answer any further questions you may have regarding the Point Beach IPEEE.
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Sincerely,
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a Bob Link l
Vice President j
Nuclear Power 1
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NRC Resident Inspector NRC Regional Administrator
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