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PEABODY COAL COMPANY
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April 28,1976
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"., G. Rede y Commission Materials Branch f 0]1 4,yM. -g*
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Washington, D., C.
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Attention: Ms. Kitty S. Dragonette !{
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Dear Ms. Dragonette:
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We have ordered a nuclear device to monitor theys#-
rcentage of ash in whole coal. This device is manufactured in England and has been accepted by the U. S. Nuclear Regulatory Commission for licensing purposes.
This device has a total of 8.2 mg (52 millicuries) of ph.tonium contained in sealed sour :es.
A copy of the Nuclear Regulatory Commission's letter accepting the device is attached along with the Radiation Safety Section for removing and replacing the radioactive isotope. We also have on hand a complete manual specific to all phases of this device.
For calibration purposes, we will have to remove the isotope in order to change filtering sections (thin aluminum sheet filters of varying thicknesses).
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We would like to secure licensing privileges so that the writer, d
Mr. Jack J. Ellis and/or Mr. Joe Johnson can legally perform this exercise and also install this equipment at our company's
' Black Mesa Mine near Kayenta, Arizona.
We expect delivery of this instrument at Kayenta, Arizona, within the next month or two.
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. Sincerely, ack No................,,,,
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cc: 'Mr. Jack J. Ellis 9702180117 970106
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NEITZEL96-314 PDR
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, RADIATION SAFETY SECTION 2
WARNINGS Radiation is'omitted from the circular aperturea'in the two inotopo capoulo holders of the.iootopo carrior frame.
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l Whenever the framo la visible avoid-direct exposuro of.
your body to the emitted radiation.
Do not put.your hand or fingers in the radiation path inside the monitor'prosentation unit.
4 If servicing requires the removal of the inotope carrier, cover the isotope holdora with the lead capa provided.
Do not touch the boryllium window of the isotope with charp inotruments which may puncture it.
If 780 isotope capsule is accidentally fractured, or in any way oponod, switch off the equipmont, isolate the area around the machine to provent accoes by other perconnel and call your licensed dioposal organisation to deal with the omorgoney.
Their name 10 at the bottom of this choot.
Find out how the onotell key interlock cystem worka and don't choat it.
It is tl.ero for your c^foty.'
Tho nastor keys must be held by a responsible person.
Don't dis-assemble any part of the presentation unit until the icotope carrior has been turned to the safe position facing the uteel shield.
Don't dis-acoemble any part of the radiation shield assembly until the isotope carrier hao been removed from the unit.
Store the isotope carrier in a'atell pipe with acrowed on end capo and mark thio container for radiation hazard.
4 Refit every screw and bolt when acae,mbling.
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Inserting Icotope Capsulea into Carrier 1.
Cover the radiation apertures with load capo.
2.
Place on bench - with radiation aporturen facing the bench.
4 3
Remove six screws holding the capnule retaining plates in position.
- 4.
Open iootope containi'ng lead pot and look inside it with a mirror.
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5.
Pick up ono inotope with long twoonero and recognise 3
notivo face.
This can bo done with.:
a.
radiation monitor, or b.- looking for wolded coal.around ca'poule.
(the weld io on-the inort_ nido).
6.
Drop capsulo into holder with activo face downwards.
- 7. - Replace retaining' plate and incert holding acrews.
8.
Leave the load capo in pocition until corri'or han boon attached to proportional counter.
Removing Isotope Caps les from Carrier :
This is the revorce of the above.
After omoving the capsule retaining plates the inotopes will fall out when the carrier is inverted.
Installing the Isotope Carrior s 1.
Incert.the cautell master keys into the proportional counter lock and turn _it to expose the beryllium window.
2.
Romove isotope carrier from safe end cover the radiation aportures with load caps.
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3 Attach the carrior frame to the proportional counter with the four scrowe provided.,
4 Remove lead cape from radiation apertures.
5 Turn proportional counter to face the ch'ield in the safe position.
6.
Remove the castell keys.
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Removing the Icotope Carrier s This is the roveroe of the above process.
Action if Lost Source Alarm 1o Raised :
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l If the blue light on control unit is illuminated indicating the t
loss of a radioactive source, the person responsible for the i
health physics of the installation should be informed immediate13 l
' Withdraw the box contining the proportional counter and isotopes l
from the. framework of the ash monit6r presentation system in his prenence tx) ascertain the locs of isotopes'.
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Vithdraw two'enstell keyn, which are captive in the double lock. on tho. proportional counter box, after rotating tho' proportionni counter and radioactive isotopes
.th' rough 180 into its SAFD POSITION.
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Unlock the proportional countor box from the ashThese monitor framework with the two keys reloaned.
keya now becomo captivo in two coparato locks.
Lift off the proportional countor box from the mechino.
The person rouponnible for the hon 1th phyoice of the
.3 installation can now une his two mantor keys to unlock the proportional counter by-inoerting the keys into the doublo lock.
[4 Turn the proportional counter from its SAFE POSITION to J
the WORKING FOSITION and ontablish whether or not ~ the inotopen are - in pince 1 n.
If the iootopeo aro in placo check the proportional counter window for damage, b.
If the window is' undamaged the fault is in the cloctronic equipment.
(If.the window in demaced then u now proportional' counter is required. )
or both isotopen is found to be minoing turn 5
If one the table of the procontation unit by hand and use a radiation monitor to examine the coal bed on the
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i table.
I If the radiation monitor locates the inotopos uae a.
L a picco of wood y" x 1" x 12" to disturb the coal Remove bod and visually expose the isotope' capsule.
i the isotope capaulo using long tweezors and store it in its container, b.
If radiation monitor fa11n to detect the isotope, carefully break up the coal bed after fitting a container to collect any discharged coal from the The isotope table or to the discharge scrapor.
I will be found to be either on the table.or in the J
If the isotope discharco chute or in the container.
capoule is still not expoced, sieve the c'oal
'through a d" ocroon.
The inotopo capsulo'io 0.425' in diameter and will be retained on the screen.
1 Wipe Tonting
,____,p This test should be carried out by licenced personnel at intervals otated by statutory regulationo.
Wipe the following nurfacon f
(1)
Isotope capnule window.
T2)
Icotope capsule holders
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Isotopo carrier frame NOTS s I
The beryllium vindow of the. proportional counter is fragile
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and ' toxic - DO NOT TOUCH IT. -
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To Expoco the Isotopo Currier for tiipo Testing :
1.
Carry out otepa 1, 2 and 3 of coction " Action if Lost Source alarm in raised".
2.
Turn proportional counter to cxpnce icotopo carrior.
3.
After wiping enpsulo holders and capsulo windows cover the aporturca with the lond capa provided.
4.
Now wipo the isotopo carrior framo.
5 Remove load capo and turn proportional counter ;o anfo position.
6.
Remove mantor keys.
7 Return proportional counter box to the monitor.
-o-o-o-o-o-o-o-o-t LICENSED RADIATION EERGENCY CONTACT Namo Addrons Tel. No.
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