ML19317D612
| ML19317D612 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/13/1976 |
| From: | Parker W DUKE POWER CO. |
| To: | Rusche R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912060851 | |
| Download: ML19317D612 (1) | |
Text
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44 k i-D Mr. Benard C. Rusche Director of Nuclear Reactor Regulation 2
U. S. Nuclear Regulatory Com=ission Washington, D. C.
20555 g.
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Re: Oconee Unit 1 Docket No. 50-269
Dear Mr. Rusche:
My letter dated March 16, 1976 provided information re,arding the Oconee 1 reactor vessel material surveillance holder tubes and requested an exemption to Appendix H to 10 CFR 50 and a revision to the Oconee Nuclear Station Technical Specifications which would permit Oconee 1, Cycle 3 operation with the reactor vessel material surveillance capsules removed. A meeting on March 23, 1976 with members of your staff discussed the structural integrity of the surveillance specimen holder tubes for continued operation during Cycle 3.
Subsequently, on March 26, 1976 an amendment to Facility Operating License DPR-38 was issued which authorized the operation of Oconee 1, Cycle 3 with the reactor vessel surveillance capsules removed.
Attachments A, B, and C are working copies of the Structural Analysis of Worn Surveillance Specimen Holder Tubes, Detailed Results from Oconee 1 Hot Functional Test Internals Vibration Meaeurements and Surveillance Specimen Holder Tube Vibration Data, respectively, which were presented at the March 23, 1976 meeting.
Subsequent to the above actions, Duke Power Company has been appraised of the results of inspections performet at another Babcock and Wilcox reactor following the removal of the reactor internals.
These inspections revealed evidence of wear to the surveillance holder tube journal bearing located at the bottom of the shroud tube.
Attachment D provides a discussion of this new information and the corrective action planned. As identified in Attachment D, it is currently anticipated that Oconee 1 will be shutdown in the near future to remove the surveillance specimen holder tubes and spring loaded retaining devices for the duration of Cycle 3 operation.
gg j Very truly yours, h
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William O. Parker, Jr.
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