ML20044G592
| ML20044G592 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 05/24/1993 |
| From: | Donnelly P CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20044G593 | List: |
| References | |
| NUDOCS 9306030362 | |
| Download: ML20044G592 (1) | |
Text
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l-l Consumers -
POWBr e.,rien u oonn.i,y Plant Manager e
w POWERING hiKN0GAN5 MtD6 MESS l
B'O Rock Point Nuclear Plant.10269 US-31 North, Charlevon, MI 49720 l
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May 24, 1993 l
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NUCLEAR REGULATORY COMMISSION DOCUMENT CONTROL DESK WASHINGTON, DC 20555 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT'- TECHNICAL SPECIFICATION CHANGE REQUEST - REPLACEMENT OF REACTOR PROTECTION SYSTEM CB-REll UNDERVOLTAGE BREAKERS AND REVISION OF THE RELEASE DEVICE TRIP RANGE..
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During the 1993 Refueling Outage, a modification to replace the. original type "TE" General Electric CB-REll breakers with General Electric recommended type l.
"TED" will proceed ("TE" type are no longer available). Surveillance testing I
has demonstrated that the breakers are showing evidence of' aging, and replace-ment before failure is prudent. The replacement will enhance the mechanical and electrical properties, and the seismic and quality features will exceed the original breaker qualifications.
A Technical Specification Change is requested because the replacement breaker l
trip range is based on 35 to 70% of nominal 120 Vac on the undervoltage l
release device coil. This results in a trip. voltage of 42 - 84 Vac or a design scram setting and tolerance of 63 plus or minus 21 Vac. This differs from the-existing scram setting and tolerance.of 52 plus or-minus 20 volts.
Attachment I contains proposed new Technical Specification pages. Attachment 2 l
contains existing Technical Specification pages marked up to show the proposed a
changes.
j Patrick M Donnelly
]
Plant ~ Manager 1
cc: Administrator, Region.III, USNRC NRC Resident Inspector - Big Rock Point.
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