ML20138G803
| ML20138G803 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 12/19/1996 |
| From: | Krieser G WISCONSIN ELECTRIC POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| VPNPD-96-111, NUDOCS 9701020281 | |
| Download: ML20138G803 (2) | |
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i Wisconsin Electnc POWER COMPANY 231 W McNgon, PO Box 2046. Mhoukee WI 53201 2046
[414)221 2345 VPNPD-96-111 Decemb::r 19,1996 e
Document Control Desk US NUCLEAR REGULATORY COMMISSION Mail Station P1-137 Washington, DC 20555 Ladies / Gentlemen, DOCKETS 50-266 AND 50-301 CLOSEOUT FOR RESPONSE TO GENERIC LETTER 92-OL REVISION 1.
SUPPLEMENT l. " REACTOR VESSEL STRUCTURAL INTEGRITY"-
POINT BEACH NUCLEAR PLANT. UNITS 1 AND 2 Nuclear Regulatory Commission (NRC) Generic Letter 92-01, Revision 1, Supplement 1, " Reactor Vessel Structural Integrity," dated May 19,1995, requested addressees to identify, collect, and report any new data pertinent to analysis of structural integrity of their reactor pressure vessels (RPVs). It also requested an assessment of the impact of any new data on RPV integrity analyses relative to the requirements of Section 50.60 of Title 10 of the Code ofFederalRegidations (10 CFR 50.60),10 CFR i
50.61, Appendices G and H to 10 CFR 50, and any potentialimpact on low temperature overpressure (LTOP) limits or pressure-temperature (P-T) limits.
Wisconsin Electric Power Company (WE) provided responses to this Generic Letter Supplement on i
August 16 and November 20,1995, for Point Beach Nuclear Plant Units 1 and 2. In an August 19,1996 letter to WE, the NRC stated that based on these responses, its stafTconsiders the RPV integrity data for Point Beach Nuclear Plant to be complete at this time.
The NRC's August 19 letter also discussed a Babcock and Wilcox Owners Group (B&WOG) report regarding application of the ratio procedure in Position 2.1 ofRegulatory Guide 1.99, Revision 2 (RG 1.99, Rev. 2) to RPV beltline welds made from Linde 80 fluxes. The NRC stafTconcluded that insuflicient information was available to support acceptance of the B&WOG report. Based on this, the NRC requested that WE provide an assessment of the application of the ratio procedure to the Point Beach P-T limit curvas and LTOP limits including an evaluation relative to the margins specified in applicable codes and standards by December 31,1996.
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December 19,1996 Page 2 l
Wisconsin Electric has reviewed the assessments of P-T limit curves and LTOP limits applicable to Point i
Beach Units 1 and 2 and confirmed that these assessments do not use surveillance data in the determination of the adjusted reference temperature (ART) for the limiting Point Beach RPV materials (i.e., Position 1.1 of RG 1.99, Rev. 2 is used in the determination of ART). Consequently, the ratio procedure of Position 2.1 of RG 1.99, Rev. 2 is not applicable to the assessments of P-T limit curves and l
LTOP limits for Point Beach Units 1 and 2. We have also confirmed that acceptable margins as specified in Appendix G to Section llI of the ASME Code exist for the Point Beach RPVs.
If surveillance data is used in future RPV assessments for Point Beach, WE will account for differences in the best estimate copper and nickel contents of beltline and surveillance welds in accordance with regulations effective at that time.
Ifyou have any questions or require additional information, please contact us Sincerely, LO W j
GaryM Krieser Manage -Industry & Regulatory Services Nuclear Power Business Unit JRP/ cms cc:
NRC Regional Administrator, Region III NRC Resident Inspector