ML20084A252
| ML20084A252 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 12/18/1973 |
| From: | Cobean W CONSOLIDATED EDISON CO. OF NEW YORK, INC. |
| To: | James O'Reilly US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084A234 | List: |
| References | |
| AO-3-2-17, NUDOCS 8304050141 | |
| Download: ML20084A252 (2) | |
Text
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(? CU Consolidate:I Edison Company of Now York. Inc.
be U 4 i Ang P! ace, N York, N Y 10003 mtw d
December 18, 1973 Re:
Indian Point Unit No. 2 Facility Operating License DPR-26 A.O. 3-2-17 Mr., James P.
O'Reilly, Director Regulatory Operations, Region I U. S. Atomic Energy Commission 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear fir. O'Reilly,
The following report of Abnormsl-Occurrence No. 3-2-17 is provided purauant to the requirements of Section G.12. 2 (a ) of the Technical Specifications to Facility Operating License No.
DP R-2 6.
On December 17, 1973 an analysis of the results of periodic tests and calibration checks relating to pressuriser level in-dicated that the setting for one of three bistables associated with high pressurizer level reactor trip was slightly above that required by Technical Specificat ion 2. 3.1.C (l).
At the time of theoc periodi-c tests and calibration checks, the reactor was in the cold shutdown condition for maintenance work associated with repairs to the feedwater piping for No 22 steam generator.
This particular bistable device is part of a two out of three logic system which provides for a reactor trip signal on high pres-suriter level.
The setpoint was found to be at 92.25% of span in-stead of the 192t of span required by the Technical Specifications.
The other two bistables of the system were found to be operating correctly.
The channel associated with this r*avice was recalibrated and re'ested satisfactorily.
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. We believe'the obcerved discrepancy to be the result of in-strument Grift an! have reques*ed our Engineering Department to provide a detailed analyses of the capability of the instrument buses to sustain the applied loading and the harmonic wave effect
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on power syplies, b3ntables, converters etc.
As part of the analy-the offect of voAtage swings on the equipment listed abovo
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Mr. James P. O'Reilly December 18, 1973 Re Indian Point Unit No. 2 Facility Operating License DPR-26 A.O. 3-2-17 will be evaluated.
Based on these analy'ces, appropriate cor-rective action will be taken.
Mr. Bert Davis of your office was notified of this occurrence by Mr. John Mahopeaco by tele-phone on December 17, 1973.
Very truly yours,
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O(L% % M o ~, ks GLW Warren R. Cobean, Jr., Manager Nuclear Power Generation cc:
Mr. John F. O' Leary
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