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Three Mile Island Nuclear Station Unit 1 (TMI-1) | Three Mile Island Nuclear Station Unit 1 (TMI-1) | ||
Operating License No. DPR-50 Docket No. 50-289 Confiration of Item in Preventative Maintemnce Program for Reactor Trip Breakers GL 83-28, Item 4.2.1 By letter dated December 12, 1985, the NRC issued a safety evaluation report on the GPUN response to item 4.2.1 (Preventative Maintenance Program for Reactor Trip Breakers) and item 4.2.2 (Maintenance and Trending) of Generic Letter 83-28. The response to item 4.2.2 was found acceptable. For item 4.2.1, confiration of the inclusion of the measurement of the undervoltage trip device roller rivet-armture clearance in the energized position was requested. | Operating License No. DPR-50 Docket No. 50-289 Confiration of Item in Preventative Maintemnce Program for Reactor Trip Breakers GL 83-28, Item 4.2.1 By {{letter dated|date=December 12, 1985|text=letter dated December 12, 1985}}, the NRC issued a safety evaluation report on the GPUN response to item 4.2.1 (Preventative Maintenance Program for Reactor Trip Breakers) and item 4.2.2 (Maintenance and Trending) of Generic Letter 83-28. The response to item 4.2.2 was found acceptable. For item 4.2.1, confiration of the inclusion of the measurement of the undervoltage trip device roller rivet-armture clearance in the energized position was requested. | ||
TMI-l Preventative Maintenance Procedure E-36, Rev.13 (Electrical) Control Rod Drive Trip Breaker Check, Step 6.5, requires the clearance between the rivet and the armture of the undervoltage trip device to be measured. | TMI-l Preventative Maintenance Procedure E-36, Rev.13 (Electrical) Control Rod Drive Trip Breaker Check, Step 6.5, requires the clearance between the rivet and the armture of the undervoltage trip device to be measured. | ||
Measurements are mde with a feeler gauge. The clearance is to be relatively constant for all armture positions which includes the energized position. A range is specified and the as-found and as-lef t clearance is recorded on a data sheet. | Measurements are mde with a feeler gauge. The clearance is to be relatively constant for all armture positions which includes the energized position. A range is specified and the as-found and as-lef t clearance is recorded on a data sheet. | ||
Revision as of 19:43, 10 December 2021
| ML20151Y738 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/10/1986 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 5211-86-2012, GL-83-28, NUDOCS 8602130118 | |
| Download: ML20151Y738 (1) | |
Text
I GPU Nuclear Corporation g g{ Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
February 10, 1986 5211-86-2012 Office of Nuclear Reactor Regulation Attn: J. F. Stolz, Director PWR Projects Directorate No. 6 U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Stolz:
Three Mile Island Nuclear Station Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Confiration of Item in Preventative Maintemnce Program for Reactor Trip Breakers GL 83-28, Item 4.2.1 By letter dated December 12, 1985, the NRC issued a safety evaluation report on the GPUN response to item 4.2.1 (Preventative Maintenance Program for Reactor Trip Breakers) and item 4.2.2 (Maintenance and Trending) of Generic Letter 83-28. The response to item 4.2.2 was found acceptable. For item 4.2.1, confiration of the inclusion of the measurement of the undervoltage trip device roller rivet-armture clearance in the energized position was requested.
TMI-l Preventative Maintenance Procedure E-36, Rev.13 (Electrical) Control Rod Drive Trip Breaker Check, Step 6.5, requires the clearance between the rivet and the armture of the undervoltage trip device to be measured.
Measurements are mde with a feeler gauge. The clearance is to be relatively constant for all armture positions which includes the energized position. A range is specified and the as-found and as-lef t clearance is recorded on a data sheet.
Sincerely, fjd*.
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,g cc: J. Thom R. Conte GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation