ML20092D924
| ML20092D924 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 06/05/1984 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| NJK-84-191, NUDOCS 8406220204 | |
| Download: ML20092D924 (2) | |
Text
(. l Quad Citias Nucisar Powir Station
@ Commonwealth Edison 22710 206 Avenue North Corcova, Illinois 61242 1 Telephone 309/654-2241 NJK-84-191 June 5, 1984 Mr. Edson Case, Deputy Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Case:
Enclosed please find a listing of those changes, tests, and experiments completed during the month of June, 1984, for quad-Cities Station Units I 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 NUCLEAR POWER STATION
,a/A ,
N. J. Kalivianak s Station Superintendent NJ K:0K/bb Enclosure cc B. Rybak f
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Drywell Cooler, RBCCW Pump Trip Logic Change M-4-2-80-31 g Description L
- In December, 1980, a Unit Two scram and Group l i solation occurred.
The Electromatic. Relief Valves were used to control Reactor pressure. -
- A ' leaky flange on a relief valve discharge line caused the Drywell to exceed 2-psig.~ The high pressure tripped the Drywell coolers and RBCCW pumps, thus eliminating any method of cooling the Drywell and reducing the pressure. This modification eliminates the 2 psig trip of the
[ coolers and pumps. The coolers and RBCCW pumps will only trip on a loss of off-site power, Evia Bus 13 and Bus 14 undervoltage- relays. The Drywell coolers are designed to operate up to approximately 5 psig. The coolers are administrative 1y controlled to be tripped if pressure rapidly exceeds 5.psig to prevent damage to the Drywell coolers.
, Evaluation l
4 The 2 psig trip of the Drywell coolers and RBCCW pumps was originally installed to prevent the blower motors from overheating ~dueto the higher air density. Their operation will have no affect on the cxisting auto-
, matic load 'shed features of the circuitry that are initiated by a loss of
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