ML20058G696
| ML20058G696 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 11/29/1993 |
| From: | Link B WISCONSIN ELECTRIC POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-93-126 GL-88-20, TAC-M83661, TAC-M83662, VPNDP-93-200, NUDOCS 9312100085 | |
| Download: ML20058G696 (2) | |
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Wisconsin IElecinc POWER COMPANY 231 w uchmnfo kn 2046.wmu*ee wi 5320UN46 M1412212345 VPNPD-93-200 NRC-93-126 1
November 29, 1993 Document Control Desk U.S.
NUCLEAR REGULATORY COMMISSION Mail Station P1-137 l
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 September 8, 1993, Mr. Anthony T.
Gody Jr. provided WE with a copy of the re-computed 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 of External Events (IPEEE) for Severe Accident Vulnerabilities (Generic Letter 88-20, Supplement 4).
1 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 j
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
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core damage frequency.
This is consistent with the requirements of i
NUREG-1407, " Procedural and Submittal Guidance for the Individual Plant Examination of External Events (IPEEE) for Severe Accident 1
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Document Control Desk November 29, 1993 Page 2 j
i Vulnerabilities."
However, it does represent a change in our previous position of using 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 anrwer any further questions you may have regarding the Point Beach IPEEE.
l Sincerely, s
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/
<2 Bob Link Vice President Nuclear Power SH/alg cc:
NRC Resident Inspector NRC Regional Administrator, Region III Subscribed and sworn to before me this Jf f day of /dninfM 1993.
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.Not,ary Public, State of Wisconsin
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