ML19273B813
| ML19273B813 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 05/09/1979 |
| From: | Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 7906180148 | |
| Download: ML19273B813 (1) | |
Text
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'o NUCLEAR REGULATORY COMMISSION PDR:HQ
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REGION IV LPDR 7 -) ),..
611 RYAN PLAZA DRIVE, SUITE 1000 o
f ARLINGTON, TEXAS 76011 May 9, 1979 Docket No. 50-267 Public Service Company of Colorado ATTN: Mr. C. K. Millen Senior Vice President P. O. Box 840 Denver, Colorado 80201 Gentlemen:
In accordance with Mr. Seyfrit's transmittal letter of April 9,1979, the enclosed Preliminary Notification (s) relating to the Nuclear Incident at Three Mile Island is forwarded for your infonnation.
Sincerely, LY G. L. Madsen, Chief, Reactor Operations and Nuclear Support Branch
Enclosure:
1.
PNO-79-67N1 cc w/ enclosure:
D. W. Warembourg, Nuclear Production Manager Fort St. Vrain Nuclear Station P. O. Box 368 Platteville, Colorado 80651 L. Brey, Quality Assurance (Same Address) 7906180MF
IMMEDIATE PRELIMINARY NOTIFICATION May 7 1979 FRELIMINARY NOTIFICATION OF AN EVENT OR UNUSUAL OCCURRENCE - PNO-79-67AM This preliminary notification provides updated information of safety or public interest significance.
Facility: Three Mile Island Unit 2 Middletown, Pennsylvania
Subject:
NUCIIAR INCI ENT AT THREE MILE ISLAND Operational Status:
1.
Three of four trains of an independent, additional charcoal filter system are presently in operation.
Iodine concentrations in the gaseous effluent are consistently below continuous release limits and below normally detectable levels most of the time.
2.
Hydrostatic testing of the existing decay heat removal system ("B" loop) is in progress.
3.
The pressurizer has been taken " solid" to demonstrate continued decay heat removal capability with the primary coolant system completely filled and to obtain confirmatory information on pressurizer level.
4.
Measursment of the liquid level inside containment is planned in the near futuro by meneuring the hydrublall-head un the sump discharge piping using a recently installed Heice gage.
5.
A measurement was made of the radioactivity inside the containment building.
It indicates that the present dose level from gases within the building is about 100 R/hr.
Othar radiation ocureco auch..
activity deposited on the containment walls and water on the reactor building floor also contribute to the dose levels in the containment but cannot be directly estimated at this time.
Environmental Status Environmental radiation levels continue to be consistent with natural background levels. Approximately thirteen minor releases have occurred during the past week (May 1-6) in conjunction with venting of the primary make-up tank.
Aerial and ground surveys taken during these releases indicated radiation levels at background, except for the periods 2000-2100 hrs on 5/1, 1500-2000 bra on 5/3, and 0700-0800 hrs on 5/4, when aerial measurements reported I-131 at MDA levels and ground survey readings were 0.034 to 0.04 mr/hr. During the period May 1-6, approximately 37 air samples were collected and all were less than MDA.
Vegetation samples collected following the releases were all less than MDA.
EPA air and water samples collected during the period April 26 to May 3 showed no evidence of. fission products (0.1-0.2 picoeuries per cubic meter I-131 for air, and 130 picocuries per liter I-131 :or water).
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IMMEDIATE PRELIMINARY NOTIFICATION 79051404Su
Continued May 7, 1979 Page 2 PNO-79-67AM
Contact:
RCPaulus, IE x27246: DThompson, IE, x28487 Distribution:
Transmitted H St 4t' HT r
Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Comm!)sioner Ahearne C. C. Kammerer, CA (For Distribution)
Commissioner Gilinsky'.20 Transmitted: MNEB fl.
P. Bldg M J. G. Davis, IE L. V. Gossick, EDO H. R. Denton, NRR Region I eb "hI H. L. Ornstein, EDO R. C. DeYoung, NRR Region II M'_7Af J. J. Fouchard, PA R. J. Mattson, NRR Region III ((*330 N. M. Haller, MPA V. Stello, NRR Region IV _ft:3J R. G. Ryan, OSP R. S. Boyd, NRR Region V H. K. Shapar, ELD SS Bldg (MAIL)
W. J. Dircks, NMSS J. J. Cummings, OIA S. Levine, RES R. Minogue, SD IE (THI) Site (Provide copy to STATE)
C. Abraham, PA (Middletown - THI-Information Center)
-White House Situation Room FDAA (Provide copies to the Administrator and the Operations Center)
EPA DOE /EOC PEMA BRP (State of PA)
DCPA HEW Handen rry (FAA)
IMMEDIATE PRELIMINARY NOTIFICATION