ML20113E363
| ML20113E363 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 04/01/1985 |
| From: | Tamlyn T COMMONWEALTH EDISON CO. |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| TKT-85-08, TKT-85-8, NUDOCS 8504160262 | |
| Download: ML20113E363 (3) | |
Text
Commonwe lth Edison Quad Citi.s Nucirr Powir Ststion 22710 206 Avenue North Cordova, Illinois 61242 Telephone 309/654-2241 50-:2 5 'l TKT-85-08 April 1, 1985 Mr. Edson G. Case Deputy Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Case:
Enclosed please find a listing of those changes, tests, and experi-ments completed during the month of March, 1985, for Quad-Cities Station Units 1 and 2, DPR-29 and DPR-30.
A summary of the safety evaluation is being reported in compliance with 10 CFR 50.59.
Thirty-nine copies are provided for your,use.
Respectfully, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCL POWER STATION b
T. K. Tamlyn Services Superintendent i
bb Enclosure cc:
B. Rybak 8504160262 850401 PDR ADOCK 05000254
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!!odification M-4-1/2-84-9
==
Description:==
On'a loss of off-site power, it is now possible for-the 1/2 Diesel Generator to. feed both. Bus 13-1 and Bus 23-1.
That will allow the 'A' RilR lleat Exchanger' to be used on a unit even if none of the RIIR Service Water Pumps on that unit will run.
It was installed as an Appendix R Fire Protection. requirement. A Turbine Building fire during a loss of off-site power could inop all of the RHR Service Water Pumps on a unit. This~ modification will allow Division I RiiR Service Water Pumps from the other unit to supply the ' A' RIIR lleat Exchanger.
. Wiring changes were made to the 1/2 Diesel Generator load breakers at Buses 13-1 and 23-1 for this modification.
' Evaluation
'This modification has no affect on the existing auto start mode of the 1/2 Diesel Generator. ~It will still automatically feed one Bus on'a loss of.off-site power. The second Bus must.be added manually, which isithe design of this modification. No new mode of failure is
, present since contacts were neither added to nor subtracted from the 1/2
- Diesel Generator load breaker's closure circuits.
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W Modification M-4-2-82-37 Description This modification involved replacing the existing 2A and 2B 48 Volt Batteries with new Class 1E seismically qualified batteries and racks.
The new batteries are made up of Gould type 2MCX190 cells, rated at 190 amp-hours.
By comparison, the old cells, Gould type DPR9, were rated at 80 amp-hours.
End-of-life of the old battery (installed in 1968) necessitated the modification._ Installation of the new battery took place during the Unit Two Refuel Outage in January 1984.
Evaluation Since the new battery has more than twice the storage capacity of'the old one, it will supply its loads for a considerably longer time.
Modification M-4-1/2-83-21 Description This modification removed the high temperature heater trip on both trains of Standby Gas Treatment System (SBGTS). The temperature switch is still'in place but has been electrically disabled. The removal of the high temperature heater trip does not affect the way SBCTS is operated. The trip was removed in order to increase the system's reliability and as part of the Environmental Equipment Qualification program.
Evaluation The high temperature trip switches are not necessary for system
. protection. There are other protective devices which ensure that the heater will not over heat. Therefore, the removal of these switches will not impact on the safe operation of the Standby Gas Treatment
. Systems.