ML17252B413
| ML17252B413 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/15/1976 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| 50-237/1974-27A, BBS Ltr. #76-883, LER 74-027-00, LER 74-027A-00 | |
| Download: ML17252B413 (1) | |
Text
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CommonweM'I Edison Dresden Nucle-wer Station R.R. #1 Morris, Illinois *so450 Telephone 815/942-2920
___________ B~~? LTR._/l-7_6-883 De_cembei;-. l~_, 19.79 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations ,£?'Region TII U. S. Nuclear Regulatory Commission 799 Roo~eyelt Road Gien Ellyn, Illinois 60137
.SUBJECT.: Dresden Station Torus-to-Drywell Vacuum Breaker
REFERENCES:
- 1) Letter from B. B. Stephenson to J. F. O'Leary dated July 29, 1974 (Abnormal Occurrence report no.
50-237 /1974-27)
- 2) Drawing number:* M-25.
REPORT NUMBER: 50-237/1974-27A REPORT DATE: December 15, 1976 OCCURRENCE DATE: July 20, 1974 FACILITY:* .Dresden Nuclear Power Station,. Morris, Illinois
. . / .
The referenced Abnormal Occurrence report s:tat;ed that a study was in ....
. progress to evaluate the possible(::iuse of phosphorus-bronze in place of teflon as a bushing material in the toru~~to-drywell vac~um breakers on Units 2 and 3. .-
- The vacuum breaker performance has been monitored for approximately three years. During this period three binding pi;-oblems h.;ive been experienced; two
- with teflon bushings and one with phosphorus-bronze bushings. Based on the results th~s far there is no justification for replace~ent of the teflon bu~hings with phosphorus-bron~e bushings. Additionally, based on the reduced frequency of failures, no other action is planned at this time.
Power St?tion BBS: CES :jo cc: Director of Inspection & Enforcement Director* of Management Information & Program Control File/NRC 13044 DEC 2 3 1976