ML20207R650
| ML20207R650 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 03/03/1987 |
| From: | Robey R COMMONWEALTH EDISON CO. |
| To: | Vollmer R Office of Nuclear Reactor Regulation |
| References | |
| RAR-87-14, NUDOCS 8703170504 | |
| Download: ML20207R650 (4) | |
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Commonwealth Edison ouad Cities Nuclear Power Station 22710 206 Avenue North Cordova, Illinois 61242 Telephone 309/654-2241 RAR-87-14 March 3, 1987 Mr. R. H. Vollmer, 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 February, 1987, 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, COMMONHEALTH EDIS0N COMPANY QUAD-CITIES NUCLEAR POWER STATION h-R. A. Robey Services Superintendent bb Enclosure cc:
I. Johnson J. Leider/E. Budzichowski t
ill 002N/0061Z F7^3170504 870303 PDR ADOCK 05000254 J
SPECIAL TEST 1-78 Special Test 1-78 was completed February 18, 1987. The purpose of this i
test was to renitor the pressure transients which accompany the uncontrolled ignition of hydrogen in the Off-Gas System piping. The results of this test will be used to formulate recommendations for eliminating hydrogen recombination outside of the'recombiner-(off-gas-fires).
Safety Evaluation
.1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the Final Safety Analysis Report is not increased because this test involves system monitoring only and does not alter the performance of the Off-Gas System.
2.
The possibility for an accident or malfunction of a differsnt type than any previously evaluated in the Final Safety Analysis Report is not created because this test involves system monitoring only and does not alter the performance of the Off-Gas System.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this test involves system monitoring only and does not alter the performance of the Off-Gas System.
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I Modification M-4-2-85-47 Description The essence of_this modification was to install Reactor Building ventilation damper control, indication, and reset capabilities in the Control Room.on Panel 912-1.
This wis the Station commitment to HED 1.1.1.A/V-4 that resulted from DCRDR based on NUREG 0737. The modification parallels existing local damper control, indication, and reset capability.
Evaluation No safety concerns have been raised from the modification. The modifica-tion assures Reactor Building Ventilation System damper isolation from a
' safe' environment, if needed, from a failure to auto-isolate upon the proper signal. Previous manual isolation was present only locally which may prove impossible for certain postulated events.
Modification M-4-2-86-22 Description This modification replaced two electro-mechanical timers with one solid state Agastat time delay relay per division on the Core Spray System.
The time delay relay is used to sequentially load the Core Spray pump to the bus in the event of a Core Spray initiation and loss of off-site power.
The electro-mechanical timers were less reliable and erratic in time.
They were required to return to an "AT HOME POSITION" to be ready for the j
f next start.
On occasions, they would not return to the "AT HOME POSITION."
Because the new Agastat relay was more reliable, and did not require an "AT HOME POSITION" alarm, the two electro-mechanical timers were replaced with one solid state relay.
Evaluation The new time delay relay performs the same function as the two electro-mechanical timers except for the "AT HOME POSITION" annunciator.
By removing the redundancy of two electro-mechanical timers and replacing them with one solid state time delay relay, the possibility of creating a mal-function is not increased because of the reliability of the new time delay relays.
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