ML17252A894
| ML17252A894 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 08/16/1973 |
| From: | Zarakas P Consolidated Edison Co of New York |
| To: | O'Leary J US Atomic Energy Commission (AEC) |
| References | |
| Download: ML17252A894 (2) | |
Text
Peter Zarakas Vice President *
~egulatory.. D.ock~t
- fBI
Dear Mr.' O'Leary:
August 16, 1973 Indian Point Unit No. 2 AEC Docket No. 50-247 Facility Operating
'License DPR-26 The following report of Abnormal Occurrence No. 3-2-10 is provided pursuant to the requirements of Section 6.12.2 (a) of the Technical Specifications of Facility Operating License DPR-26.
On August 2, 19 7 3, during the performance o.f periodic test-.
and calibration procedure PT-MI~ it was discovered that the limiting safety system setting of Channel III of the Overpowe*r-Overtemperature Del ta-T Reactor Trip* Circuitry for (q1= - qb) > ~I 2 was below that required by Technical Specification 2.3.1.B.
At the time of the occurrence, the reactor was shutdown with the primary* coolant system at 350°F.
The discrepancy is believed-to have resulted from an improper adjustment of the channel.
To correct the situ-
.at ion, Char:inel*III was recalibrated and tested satisfac-torily.
During future calibration checks, particular attention will be paid to t~ese instruments to enable a more definitive determirtation as to the cause of the problem.
In considering the* safety implications of the occurrence, it should be noted that the discrepancy in this instrument was detected during a routine surveillance test, which is performed monthly.
Furthermore, there are three other trip-circuits (Channel I, II and IV) providing complete reactor protection against an excessive axial flux tilt.
Channel III, incidentally, was still operational for
Mr. John F. O'Leary
--.---~-
- August 16, 1973
~e:
Indian Point Unit No. 2 AEC Docket No. 50-247 Facility Operating License DPR-26 an axial tilt of qb > qt.
For these reaso'ns, the safety implications to the occurrence are considered to be negligible.
truly yours, Copy to Mr. James P. O'Reilly