ML19207C398
| ML19207C398 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 08/29/1979 |
| From: | Short T OMAHA PUBLIC POWER DISTRICT |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7909110580 | |
| Download: ML19207C398 (12) | |
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Omaha Public Power District
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1623 MANNEY a
OMAMA, NE5RASMA 68102 e TELEPHONE 536 4000 AREA CODE 402 August 29, 1979 M". Robert W. Reid Operating Reactors Branch No. 4 Df vision of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Reference:
Docket No. 50-285
Dear Mr. Reid:
In response to a telephone conversation held with Mr. Sy Black, of your staff, c,n Auaust 16, 1979, please find attached the following information in support c: tie District's letter of June 14, 1979: : Neutron Dose Equivalent Rates using TLD's and Neutron REM Counter :
General Description and Specifications for Portable Neutron REM Counter, Model PNR-4 s :
Calibration data for PNR-4 Sincerely,
,T. E. Short
' Assistant General Manager TES/BJH/ rh xc:
LeBoeuf, Lamb, Leiby & MacRae 1333 New Harpshire Avenue H.W.
Washington, D. C.
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L NEUTRON DOSE EQlCVALENT RATES Below are the readings of the test badges and the neutron REM counter.
Placement of the badges are as follows:
Group 1 - In containment equipment hatch door.
Gioup 2 - Outside contair. ent equipment hatch door.
Group 3 - Inside auxiliary i filding wall.
Group 4 - Outside auxiliary building wall.
Neutron Dose Rates TLD Neutron Dose Rates with Neutron REM Ratio =
Group 1 Badge with TLD's (mrem /hr)
Counter (mrem /hr)
REM Counter 1
17.7 Note (1) 2 17.2 3
16.5 4
14.4 5
5.9 Group 2 1
6.6 5.5 1.2 2
6.7 5.5 1.2 3
6.7 5.0 1.3 4
4.1 Note (2) 5 5.2 4.0 1.3 6
5.6 4.5 1.2 7
5.3 4.5 1.2 8
5.1 Note (2) 9
- 3. 9 3.5 1.1 10 0.1 3.0
- 3. 3 E-02 11 4.2 3.5 1.2 1;3 ATTACHMENT 1 (7 pages) s
Neutron Dose Rates TLD Neutron Dose Rates with Neutron REM Ra ti o =
Badce wi th TLD's (mrem /hr)
Counter (mrem /hr)
REM Counter 9
12 2.6 3.5 0.7 13 3.0 3.0 1.0 14 3.9 3.5 1.1 15 2.3 2.0 1.2 16 4.1 3.5 1.2 17 3.9 4.0 1.0 18 3.6
- 3. 5 1.0 19 2.6 2.5 1.0 20 2.6 2.5 1.0 21 3.6 3.0 1.2 Group 3 1
0.2 0.5 0.4 2
0.2
- 0. 5 0.4
- 3. -
0.2
- 0. 5 0.4 4
0.2
- 0. 5 0.4 5
0.2 0.5 0.4 10 0.1 0.5 0.2 11 0.2 0.5 0.4 12 0.2 0.75
- 0. 3 13 0.2 0.5 0.2 14 0.1 0.5 0.2 19 0.2
- 0. 5 0.4 20 0.1 0.5 0.2 1
21 0.2 0.5 0.4 22 0.2 0.5 0.4 9 $,0 1
Neutron Dose Rates TLD Neutron Dose Rates with Neutron REM Ra ti o =
Badae wi th TLD's (mrem /hr)
Counter (mrem /hr)
REM Counter 23 0.2 0.5 0.4 24 0.2 0.75
- 0. 3 25 0.2 0.5 0.4 26 0.2 0.5 0.4 27 0.2 0.5 0.4 28 0.2 0.5
- 0. 4 29 0.4
- 0. 5 0.8 30
- 0. 2
- 0. 5 0.4 31 0.3 0.5
- 0. 6 32 0.3 0.5 0.6 33 0.2 0.5 0.4 34 0.2
- 0. 5 0.4 35 0.2 0.5 0.4 36
- 0. 2 0.5 0.4 37 0.2 0.5 0.4 38
- 0. 3 0.5 0.6 39 0.2 0.5 0.4 40
- 0. 0
- 0. 5
- 0. 0 41 0.4 0.5 0.8 42
- 0. 3 0.5 0.6 43
- 0. 3 0.5
- 0. 6 44 0.2 0.5 0.4
~
+
45 0.0 0.5 0.0 i
46 0.2 0.5 0.4 940 1;5
Neutron Dose Rates TLD Neutron Dose Rates with Neutron REM Ratio =
Badce wi th TLD's (mrem /hr)
Counter (mrem /hr)
REM Counter 47 0.3 0.5 0.6 48 0.2 0.5 0.4 49 0.2 0.5 0.4 50 0.3 0.5 0.6 51 0.3 0.5 0.6 52 0.2 0.5 0.4 53 0.2 0.5 0.4 54 0.2 0.5
- 0. 4 55 0.2 0.5 0.4 56
- 0. 3 0.5
- 0. 6 57
- 0. 3 0.5
- 0. 6 58 0.3 0.5 0.6 59
- 0. 3 0.5
- 0. 6 60 0.2
- 0. 5
- 0. 4 61 0.2 0.5 0.4 62 0.2
- 0. 5 0.4 63 0.2 0.5
- 0. 4 64 0.2 0.5 0.4 65 0.3 0.5 0.6 66 0.2 0.5 0.4 67 0.2 0.5 0.4 68 0.2 0.5 0.4 4
69 0.2 0.5 0.4 70 0.2 0.5 0.4
Neutron Dose Rates TLD tieutron Dose Rates wi th Neutron REM Ra ti o =
Badce wi th TLD's (mrem /hr)
Counter (mrem /hr)
REM Counter 71 0.2 0.5 0.4 72 0.2 0.5
- 0. 4 Group 4 1
0 tiote (1) 0 2
0 0
3 0
0 4
0 0
5 0
0 6
0 0
7 0
0 8
0 0
9 0
0 10 0
O lT 0
0 12 0
0 13 0
0 14 0
0 15 0
0 16 0
0 17 0
0 18 0
0 19 0
0 20 0
0 i
21 0
0 22 0
0
~,7 5
jr 9'
Neutron Dose Rates TLD Neutron Dose Rates with Neutron REti Ra ti o =
Badce with TLD's (mrem /hr)
Counter (mrem /hr)
REti Counter 23 0
Note (1) 0 24 0
0 25 0
0 26 0
0 27 0
0 28 0
0 29 0
0 30 0
0 31 0
0 32 0
0 33 0
0 34 0
0 35 0
0 36 0
0 37 0
0 38 0
0 39 0
0 40 0
0 41 0
0 42 0
0 43 0
0 44 0
0 45 0
0 46 0
0 940 li8
Neutron Dose Rates TLD Neutron Dose Rates with fleutron REM Ra ti o =
Badge with TLD's (mreWhr)
Counter (mrem /hr)
REM Counter 47 0
ilote (1) 0 48 0
0 49 0
0 50 0
0 51 0
0 52 0
0 53 0
0 54 0
0 fl0TES:
(1) The readings for Group 1 and Group 4 were not taken per mutual agreement between Mr. Block (NRC) and OPPD in a telephone discussion on August 16, 1979.
(2) Data not available.
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1 ME ASURES NEUTRON DOSE RATE FROM THERMAL THROUGH F AST TUBE GIVES HIGH GAMMA REJECTION BF3 O
DETACH ABLE DETECTOR D
g ENERGY SPECTRUM INFORMATION WHEN USED cup WITH 3" SPHERE FOR LOW DOSE RATE MEASUREMENTS, A PORTABLE d {l SCALER MAY BE USED IN LIEU OF COUNT RATE D
j Ala METER (PNR-4/PS 2/SK.1)
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FOUR DECADES DISPLAYED WITHOUT SCALE SWITCHING i
UTILIZES ANY STANDARD D. SIZE BATTERIES BATTERY CONDITION CHECX O,~ > 0N, n O P N R-4 C
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Portable Neutron REM Counter, Model PNR-4 GENER AL DESCRIPTION The l'NR 4 is a portable, battery operated instrument for the detection and measurement of the dose rate from neutron radiation.The instrument detector is a 9 inch diameter, cadmium loaded polyethelene sphere with a BF; tube in the center. This detector has been shown to have a response which closely follows the 4 The theoretical dose from neutrons over the energy range from.025 eV (thermal) to about 10 MeV.
BF tube aHows excellent gamma rejection.
3 The dose rate is read out by the Eberline LIN-LOG presentation,which eliminates scale switching and multiplying factors,)et retains hnear increments within each decade. Four decades are covered using two meter movements to yield a scale length of about 1.5 inches per decade,which gives maximum readability and ease ofinterpretation. Full scale readings of the four decades are 5,50,500 and 5,000 millirem per hour respectively.
For low dose rate measurements the LIN LOG dose rate meter may be replaced with a portable scaler with an audio speaker. The speaker is used to locate neutron radiation and after location the scaler may be used to obtain sufGcientdata so that a reasonable statistical accuracy may be met. A conversion factor of approx-imately 50 CPM / MREM /hr may be applied to the scaler data to convert to dose rate.Specify PNR-4/PS-2/
SK-1 Neutron Counter.
The counter may be detached from the detector for remote monitoring or ease of carrying.The counter electromes are mounted on three plug-in etched circuit boards for ease of mainten:uice.
The battery pack uses fisc standard "D" size ce!!s of most types commercially available (carbon-zinc, mercury. nickel-cadmium, alkaline). This allows choice of types depending on what feature is considered most important. A batterv condition check is prosided on the front panel.
Aural monitoring capabihty is included by means of a connector on the front panel. Either a headset or an EIC Model SK-1 Speaker may be used.
A Modified-Sphere Neutron Detector, D. E. Hankins, LA-3595.
8 aThe substitution of a BF; tube for the til crystalin neutron REM meters,D. E.Hankins, Health Physics Journal, Volume 14, Num:er 5,May 1968.
SPECIFIC ATIONS RANGES: Four LIN. LOC decades, full seale readings of 5,50,500 and 5K milli REM per hour respectively.
DETECTOR: BF tube in 9" diameter (22.9 cm), cadmium loaded polyethelene sphere.
3 DIREC TION AL RESPONSE ? Within :10"o.
ENERGY RANGE: Thermal to approximately 10 MeV.
CAMM A REJECTION: Up to 500 R,hr, dependent on high voltage setting.
OPERATIONAL CONTROLS: Three position switch (OFF, ON, BATTERY CHECK), H.V. ADJUST.
INDIChTG H: Visual - Scale Markings: 10 divisions per decade with numbers at 1/2 and full decades.
Scale Lcngtn. nominal 6.32"(16 cm)- 1.74" ist and 3rd decades,1.42" 2nd and 4th decades. Response Time: different for each decah and varies with ca!ibration setting. Nominal: 12 sec.1st decade,6 sec.
4 2nd decade,1.5 see. 3rd decade,0.3 sec. 4,th decade. Lmeanty; e8? of full scate oidecade bemg read, when properly eahbrated and drhen with a repetitive signal. Aural - BNC serics coaxial connector. Signal:
direct-coupled squ. ire wave.5V through 22K. Each oulse counted changes state of output.
Continued on the following page qs b.gfplpM PO Box 2 t08. Santa Fe.New Menco BM01005) k
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PORTABLE NEU TRON REM COUNTER, MODEL PNR-4 (continued)
B \\ ITERY BOX AND B ATTERIES: Model BP 1-1, plug-in inodule. containing five carbon.zine "D"ceUs.
t) rical battery life of 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />. Mercury, alkaline.or NiCd "D" sized batteries may be used for special arphcations.
FLECTRONICS: liigh vohage minimum adjustment range 1300 to 2000 volts. HV regulation,less than 125 wits change with battery change frem S to 6.0 volts. HV output impedance approximately 6 meg-ohms. Counter input sensitivity variable from I, to 50 mi'livolts by card-mounted adjustment. Counter niput unpedance approumately 40K. Paired pulse resolving' time less than 5 microseconds. Calibrated b:. 4 chassis-mounted adjustments. Typical range from 1/2 to 2 times nominal calibration point.
ENVIRONMENTALCAPABILirlES: All critical points are sealed with O-nngs or glands. Shock resistant.
TEMPERATURE CAPABILITIES: Operates from -40*F to +140*F (-40 C to 60*C), depending on type of "D" cells used.
INSTRUMENT FINISH : Baked gray hammertone en.unei and chrome-plated fittings.
SIZE: 17" H x 9-1/2" L x 9" W (43.2 x 24.1 x 22.9 cm). Instrument 4" W (10.2 cm).
WE!CliT: Approx:mately 19 l/2 lbs.(8.9 Kg).
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