ML20004E823
| ML20004E823 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 06/04/1981 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| NJK-81-203, NUDOCS 8106150341 | |
| Download: ML20004E823 (4) | |
Text
_
' CommonwrIth Edison s
C Quad Citira NuclItr P wer Station h
S G-22710 206 Avenus North Corcova,Illmois 61242 Telephone 309/654-2241 NJK-81-203 June 4, 1981 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 experiments _ completed during the month of May 1981, for Quad-Cities Station-Units One and Two, DPR-29 and DPR-30.
A summary of the safety evaluation is being reported in
' compliance wi_th 10 CFR 50.59 Thi rty-nine copies are provided for your use.
Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION be). Jbv-ut N. J. Kalivianakis Station Superintendent bb
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M-4-1-73-ll3 Description of Modification
-This modification installed three new control room aiarms to notify the control rcxxn operator that the Group 1, 2, or 3 isolated logic circuitry is not reset.
Previously, it was possible to reset the
" Group Isolation Trip" alarm without resetting the relay assembly.
The new alarms will also energize upon power failure to any seal-in relay-during normal plant operation.
'Sunnary of Safety Analysis Since only alarms are being added, there are no safety implications.
The modifications will not result in any changes to the Technical Specifications or the FSAR, nor will the reliability-or operability of the Primary Containment isolation System change.
The addition of the alarms will not reduce the margin of safety because there is no change in the " Isolation Trip" part of the system.
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.i SPECIAL TEST l-50 was completed on May 12, 1981
- This test was esed to gather baseline data for the Inservice Inspection
- program including suction pressure, discharge pressure, flow rate, dif ferential pressure, speed, and vibration af various pumps.
Summary of the Safety Evaluation The probability of an occurrence or the consequences of an accident or malfunction previously evaluated in the SAR is not increased because th.
test i s similar to the surveillance currently eeing performed periodically.
The probability of an accident or malfunction of a different type than
~ evaluated in the SAR is not created because the test is similar to the surveillances currently being performed periodically.
The margin of safety as defined in the basis for any Technical Specification is not reduced because all operations are within the limitations and guidelines of the Technical Specifications.
SPECIAL TEST l-52 was completed on May 19, 1981 This test was performed to determine the flow rate through the ECCS room coolers and Diesel Generator heat exchangers for indication of flow blockage in response to IE Bulletin 81-03 Summary of the Safety Evaluation The only equipment affected by this test are the ECCS room coolers.
These coolers are intended for long term reliability for the ECCS Systems.
If they were required, there would be ample time for the coolers - to be returned. Thus, the probability of an occurrence or con-sequence of an accident analyzed in the SAR is not increased.
Cooling water will, at all' times be available to the Diesel Generators.
The cooling water pump will not be disabled in any way.
The ECCS room coolers, which are valved out, could be returned if they are required.
Thus, there is no possibility of an accident not addressed in the SAR resulting from this test.
The operability of the Diesel Generators and ECCS Systems is not af fected.
Since no system, vital to plant operations, are affected, the margin of safety is not reduced.
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a SPECIAL TEST 2-34 was completed on May 12, 1981 This test was used to gather baseline data for the Inservice inspection program including suction pressure, discharge pressure, flow rate, differential pressure, speed, and vibration of various pumps.
Summary of the Safety Evaluation The probability of an occurrence or the consequences of an accident or malfunction previously evaluated in the SAR is
..>t increased because the test is similar to the surveillance currently be.ng performed periodically.
The probability of an. accident or malfunction of a different type than evaluated in the-SAR is not created because the test is similar to the surveillances currently being performed periodically.
The margin of safety.as ' defined in the basis for any Technical Specification is not reduced because all operations are within the limitations and guidelines of the Technical Specifications.
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