ML14097A407
| ML14097A407 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/07/1979 |
| From: | Paulus R, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-067AM, PNO-79-67AM, NUDOCS 7905140253 | |
| Download: ML14097A407 (2) | |
Text
IMMEDIATE PRELIMINARY NOTIFICATION May 7 1979 PRELIMINARY NOTIFICATION OF AN EVENT OR UNUSUAL OCCURRENCE -
PNO-79-67AM This preliminary notification provides upated information of safety or public interest significance.
Facility:
Three Mile Island Unit 2 Middletown,,,Pennsylvania
Subject:
NUCLEAR INCIDENT AT THRIE M1ILE ISLAND Operational Statust
- 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 dcay 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 inforrmation on pressurizer level.
- 4.
Measurement of the liquid level inside containment is planned in the near future by measuring the hydrostatic head on the sump discharge piping using a recently installed Heise 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. Other radiation sources such as activity deposited on the containmenL 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 hrs 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 picocuries per cubic meter 1-131 for air, and 130 picocuries per liter 1-131 for water).
CONTINUED
- IMEDIATE PRELIMINARY NOTIFICATION"-."-'-'
7905140263
Continued Page 2 May 7, 1979 P..g, 2 PNO-79-67AM Contact-RCPaulus, IE x27246; DThompson, IE, x28487 Distr:bution:
Transmitted H St -4 1(
Chaom n
Kliendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Commissioner Gilinasky (For Distribution)
Transmitted MNBB 1120 P. Bldg ITD!
J.
G. Davis, iE L.
V. Cossick, EDO H. R. DenJo, NRR Region i
- 11. IL.
Ornstein, EDO)
R. C. DeYoung, NRR Region II I
Z J. J. Fouchard, PA R. J, Mattson, NRR Region III J]J._2 X. M. Haller, MPA V. Stello, NRR Region IV R. G. Ryan, OSP R. S. Boyd, NRR RegionIV V
H. K. Shapar, ELD SS Bldg (MAIL)
W. J. Dircks, NHSS J. J. Cummings, OA S. Levine, RES R. Minogue, SD It (TMl) Site _(Provide copy to STATE)
C. Abraham, A tuat o
(Middletown-TMI-Information Center)
White House Situation Room ____
PA rovide copies to the Administrator and the Operations Center)
EPA DOE/EOc PEIIA BRP (State of PA)
DCPA HEW Randa f
t (AA)
IMMEDIATE PRELIMINARY NOTIFICATION