ML20205Q408

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Forwards Responses to Five Questions from NRC Re Radioactivity on Equipment & in Air Conditioning Sys,News on Reactor Incident & Any Info on Polish Radiation Situation
ML20205Q408
Person / Time
Issue date: 05/06/1986
From: Senseney R
NRC
To: Evers T
NETHERLANDS, GOVT. OF
Shared Package
ML20205N459 List:
References
FOIA-86-335 NUDOCS 8704030521
Download: ML20205Q408 (9)
v • d • e


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. .- s QUESTION 1: Equipment being used to measure radioactivity what to do to clean them, to make them read accurately in next use?

ANSWER:

Instruments may be cleaned with freon, acetone, or other liquids using paper towels and cotton swabs. Concerns are (1) that the counting volumes and surfaces dry completely because moisture can change the instrument behavior, (2) that the cleaning liquids leave no residue because the residue could affect the instrument behavior, and (3) that paper towels, cotton swabs and similar materials leave no paper fragments, fibers or lint in the electronics or in the counting volumes. Care should be taken that solvents do not damage painted surfaces or destroy instrument markings. Solvents like acetone must be used only with special care around circuit boards; freon is preferable. Special care should be taken around delicate parts such as thin windows a'nd electrodes.

The proper function and response of radiation detection instrumentation is verified in several ways during routine use:

a. verification that the instrument has been calibrated (i.e., responds I accurately and effectively to the radiation it is designed to measure) in accordancewitharecognizedcalibrationstandards(e.g.,ANSN323-1978);
b. the instrument should be checked for physical damage (such as a damaged probe, stuck meter needle, dents, moisture, frayed cords) which would
affect its proper operation;
c. a battery check should be perfonned to verify that there is sufficient power to operate the meter;
d. instruments should be response checked in a known radiation field prior to use to be sure they respond to radiation; i
e. instruments which have been used on an area where they would become radioactively contaminated should be surveyed for radiation prior to being removed from such areas.

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QUESTION 2: Air conditioning systems in offices, etc., - what can be done to minimize problem?

ANSWER:

Radioactive particulates may collect on air conditioning / heating system filters.

As a precautionary measure, filters at a few locations should be surveyed to see if the buildup of activity might warrant special precaution in servicing air conditioning / heating systems.

To minimize the potential for exposure to radioactive materials during passage of a radioactive cloud or plume:

a. keep all building doors and windows closed
b. turn off building ventilation and air conditioning systems - avoid a negative pressure on the building
c. control drinking water sources - use canned or bottled water or beverages-if practical
d. minimize use of the public water supply if contamination of that source is expected.

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00ESTION 3: Any late news ~on reactor incident? Was it a meltdown? Human error? Fire still burning? Radiation still emerging?

ANSWER:

No information on the cause of the reactor accident is available yet. It is known that a fuel damage accident of unspecified extent occurred. If radiation is still emerging, it will be at a much lower rate than when the accident began.

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QUESTION 4: Any information on Polish' radiation situation?

ANSWER:

On May 6, 1986 USNRC received from Mike Jankowski, IAEA, two pages of data regarding radiation levels in Poland over the period April 28 through May 3, 1986, and one page regarding measurements in Yugoslavia (see Attachment 1).

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  • BETA ACTIVITY APR!L 28 APRIL 29 APRIL 30 MAY 1 MAY 2 MAY 3 BEFORE ACCIDEN
  • 0.245Vk!//,

per cubic Per hour -

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.03- .05- 0.55- 0.1 110 4.9 6.7 meters Milk Ng7 -

.30- 42- 23- 35- 37-2000 1170 945 990 583 42 Surface -

Water -

4.4 1,3- 0.2- 0.5-0.7- .07 40 89 103 417 59 7

5.7- 0.2- 0.3- 0.3 0.7-l Nap 48 74 101 111 37 . 04 I

Grass per i kilograms -

2400- 3200- 2700- 3600- 2440-

{ 50000 105,000 87,000 49,000 3223 I

52.000 Soil 2-3 133- 158- 185- 395- 559-centimeters #

brams 1870 12958 8701 3300 15955 4

! Fallout - 2j 26- 185- 84- 37 35 B4 per l

sq. asters 2h 19,514 1000 23.000 2968 per day Meat ~

i Per kilograms ih* jh* 51- 50- 50-182 99 183 788 l

i GreenVe9s(Fresh) - - 2600- 480- 238- 2600- 132 j Per Kile9 rams 2847 1000 82000 17.000 i

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ISOTOPIC COMP 051T10N IN AIR CONCENTRATION j ,

IN WAR $AW BETWEEN APRIL 28-MAY 3. 1986 s... ._

Bq' cubic meter Iodine 132 minimum 260 - maximun Tellurium 132 - 1.2 /164 Cesius 137 - 0.2 / 19

' Iodine 134 - 0.1 /:10 s

1-103 - 0.1 / 29 .

I-131 - 1.6 / 186 e

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i' INFollMATION FROM YUG0s AVIA Measurements from Western Yugoslavia on May 5. 1986 Average milk - 100 Sq I-131 per liter Maximum - 770 Sq I-131 per lihr Cesium 137 detected in milk - measurement value 4 Bq CS 137 per liter

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Detected 131 in drinking water in yubjlana (second largest city in Yugoslavia) values about 1 Bq per 1<ter Measurements in the northwestern part of Yugoslavia on May 6..

Dose rate 1 meter above ground 16 microra per hour above grass- 100 microra per hour ,

Milk - other radionuclides of I-133. Tellurium 132. Cesium 134. Ra 103 Lanothium 140 are detected and measurements will be reported tomorrow.

Wednesday. May 7.

Traces of Neptuium 239 gannaspectra alpha spectrometry measurements are in progress l

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s' QUESTION 5: " Positive Void Coefficient" - meaning?

ANSWER:

When a reactor has a " positive void coefficient" (of reactivity) the power tends to increase whenever the void (i.e., gas or steam) volume increases.

Some examples are: (1) if a gas bubbles through the liquid, the power tends to increase; (2) if the power goes up, more water boils and thus more void volume is present. This causes the power to go up, which in turn causes more void volume. Consequently, it is easier to lose control.

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