ML18064A745
| ML18064A745 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 05/01/1995 |
| From: | Haas K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9505100152 | |
| Download: ML18064A745 (2) | |
Text
consumers Power KurtM. Haas Plant Safety and Licensing Director POW ERIN&
MICHlliAN"S l'IUlliRESS Palisades Nuclear Plant: 27780 Blue Star Memorial Highway, Covert, Ml 49043 May 1, 1995 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT AMENDMENT 163, PRESSURE-TEMPERATURE LIMITS, SUPPLEMENTAL INFORMATION On October 5, 1994, Consumers Power Company submitted a Technical Specifications (TS) change request proposing revised Pressure - Temperature (PT) limits because the accumulated reactor vessel (RV) fluence was approaching the value used to calculate the existing TS limits. Subsequent to that submittal, materials from the retired steam generators were tested for copper and nickel content. These material were from the same heats as used in the Palisades reactor vessel axial welds.
The results of that testing showed higher than expected copper content.
Since this higher copper content and the associated increased chemistry factor had significant impact on the Palisades Pressurized Thermal Shock (PTS) analysis, the NRC asked if the proposed PT limits were similarly affected.
We explained that the PT limits were determined by the more limiting circumferential weld material rather than axial weld material, which was limiting for PTS.
The PT limits were, therefore, unaffected.
NRC personnel asked that we confirm that explanation in writing.
The PT limit TS change request was approved on March 2, 1995, as TS Amendment 163.
The PT limits (10CFR50 Appendix G) are unaffected by the orientation of weld material; the PTS screening limits (10CFR50.61) are higher for circumferential welds than for axial welds.
Materials similar to the tested steam generator weld material (heats W5214 and 348009) were used only in RV axial welds.
The Appendix G PT limits were bounded by the circumferential weld material (heat 27204).
The higher copper content of the RV axial weld materials only affected the chemistry factor for that material, increasing the adjusted reference temperature from the previously calculated 263°F to 271°F; the circumferential weld materials, with an adjusted reference temperature of 287°F, was still most restrictive for the PT limits.
( --* 9505100152* 950501- -
PDR ADOCK 05000255 p
- 1\\DD' I 0
SUMMARY
OF COMMITMENTS This letter contains no new commitments or rev1s1ons to former commitments.
It completes the commitment to submit this explanation made in our February 22, 1995 letter on this subject.
I !
Kurt M. Haas Director, Plant Safety & Licensing CC Administrator, Region III, USNRC Resident Inspector, Palisades Attachment