ML20084J590
| ML20084J590 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 08/25/1972 |
| From: | Palmer F COMMONWEALTH EDISON CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| FAP-72-162, NUDOCS 8305180321 | |
| Download: ML20084J590 (2) | |
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QU A D CITIE S NUCLEAR POWE R S T A TIO N Address Reply to:
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August 25, 1972 4E]Ni% Nr
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0 Mr. J. F. O ' Le ary
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Director, Directorate of Licensing U. S.
Atomic Energy Commission Washington, D.
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20545
SUBJECT:
License DPR-30, Quad-Cities Nuclear Power Station Unit 2, Section 6.6.C.1 of the Technical Specifications Dear Mr. O' Leary This is to report a condition relating to the operation of the plant where a Main Steamline Isolation Valve may have had a closure time of greater than 5 seconds as specified by the Technical Specifications, Table 3 7.1.
Problem and Investigation On July 2, 1972 the reactor was critical at 75 per cent power during the startup test program.
While conducting the quarterly timing test on the Main Steamline Isolation Valves, valve AO 2-203-2A was found to close in 6.5 seconds as timed by a stop watch in the control room.
A visual inspection of the valve revealed, no abnormalities.
After this inspection the valve was closed from the control l
room and timed at 4.6 seconds.
A third closure test was then performed and the valve closure time was 4.9 seconds.
Prior to this test the subject valve had been exercised by a partial closure ' urveillance test most recently on i
s July 1, 1972.
The last timing test had been performed on May 14, 19 72 and the valve closure time was 4.5 seconds.
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Mr. J. F. O ' Le ary August 25, 1972 Conclusions It is suspected that the recorded valve closure of greater than five seconds was the result of an inaccurate timing by stop watch on the first closure.
For this reason station management did not consider this to be an abnormal occurrence.
In subsequent discussions with Region III inspectors, however, it was decided to report this item since it may be indicative of a situation where valve closure becomes abnormally slow due to the time interval since the last operation of the valve.
Very truly yours, COMMONWEALTH EDISON COMPANY Quad-Cities Nuclear Power Station
.xes' F. A. Palmer Superintendent FAP/zm 9
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