ML17252A890
| ML17252A890 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 10/26/1973 |
| From: | Cobean W Con Edison, Consolidated Edison Co of New York |
| To: | O'Leary J US Atomic Energy Commission (AEC) |
| References | |
| Download: ML17252A890 (2) | |
Text
.. *
'... ':_~ t:" r;.-*-
Regtiratory:
L,.~
.e vy.
Consolidated Edison Company of New York, Inc.
4 Irving Place, New York, NY 10003 Mr. John F. O'Leary Directorate of Licensing Office of Regulation October 26, 1973 Re:
Indian Point Unit No. 2 AEC Docket No. 50-247 Facility Operating License DPR-26 A.O. 3-2-13 U.S. Atomic Energy Commission Washington, D. c.
20545
Dear Mr. O'Leary:
The following report is provided pursuant. to the requirements of Section 6.12.2(a) of the Technical Specifica~ions for Faci-lity Operating License DPR-26.
On October 11, 1973, approximately one hour after a reactor shutdown from 50% of rated power, portable instrumentation in the Primary Auxiliary Building indicated that an unplanned re-lease of gaseous and particulate radioactivity had been made within the building.
The release was limited to the P.A.B.
and was removed from there via the normal plant vent system over a period of approximately one hour.
Immediately upon receipt of the alarm from the portable monitor, investigative charcoal and millipore samples of the plant vent effluen.tt: were taken and analyzed.
In addition, a sample of the portable monitor filter paper was also analyzed for particulate activity.
a~
. <~t::,";
An investigation was undertaken to determine the cause of the..,in~:.,... -
dicated release.
- Plant components* and piping which handle. waste or radioactive gases were examined as possible sources.
No faults in equipment or operating procedures were found during the investi-gation which could directl~ account for the release.
However, the PAB ventilation system had.been automatically shut down in connec-tion with a safeguards signal which followed the reactor shutdown.
On the basis of this,. and the fact that no equipment malfunction or improper procedure was uncovered, we have concluded that no unplanned release from the site did occur, and that the presence of airborne activity in the PAB resulted only from the building vent-ilation system being in a shutdown condition during a period of 79.23
.:;..--.,-:....--fl'
_Mr. John F. O'Leary 2 -
October 26, 1973 Re:
Indian Point Unit No.2 AEC Docket No.40-247 Facility Operating License DPR-26 A.O. 3-2-13 time in which liquid waste was being processed.
Under normal circumstances, radioactive gases liberated from the liquid waste are directed to the plant vent via the PAB.ventilation system.
In this case, since the ventilatio~ system was secured, such gases accumulated within the building and this, in turn caused annuncia-tion o.f the aforementioned alarms.
Based on airborne activity levels recorded by two monitors located within the PAB, the amount of activity which accumu-lated in the building during the period of time the ventila-tion system was secured is estimated to be approximately one curie, the major portion of which was a mixture of xenon and krypton gases.
The accumulation of I-131 and particulates with a half-life greater than 8 days is estimated to have been 35)1 ci and 7_,µ.ci, respectively.
The maximum conceritration5of airborne activity measured within the building, 3.25 x 10-
µci/cc, is well below the applicable limit specified in 10 CFR 20, and the rate at which the gas was released from the site following restoration of the ventilation system was less than 10% of the Technical Specification limit.
Warren R. Cobean, Jr.
Manager - Nuclear Power Generation Department
- cc:
Mr. James P.
- O 'Reilley Regulatory Operations, U.S.A.E.C.