ML031690033
| ML031690033 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/06/2003 |
| From: | Mecredy R Rochester Gas & Electric Corp |
| To: | Clark R Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML031690033 (13) | |
Text
Robert C. Mecredy LJZ5MD--Vice President Always at Your Servke Nuclear Operations June 6, 2003 Mr. Robert L. Clark Office of Nuclear Regulatory Regulation U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001
Subject:
Supplementary Information Associated with the Control Room Emergency Air Treatment System (CREATS) Actuation Instrumentation Change (LCO 3.3.6)
Rochester Gas and Electric Corporation R.E. Ginna Nuclear Power Plant Docket No. 50-244
Reference:
Letter from Robert C. Mecredy (RG&E) to Guy S. Vissing (NRC), "Application for Amendment to Facility Operating License Control Room Emergency Air Treatment System (CREATS) Actuation Instrumentation Change (LCO 3.3.6)",
dated May 3, 2000.
Dear Mr. Clark:
In the above Reference, RG&E submitted a proposed change to the Improved Technical Specifications associated with the Control Room Emergency Air Treatment System (CREATS)
Actuation Instrumentation requirements. Subsequent to the submittal, as the result of discussions with the NRC staff, RG&E would like to provide additional information associated with the response of the new CREATS Actuation Instrumentation to high energy (> 1.5 MeV) gamma radiation.
The new CREATS Actuation Instrumentation radiation monitors are based on a Model ZP 1320 Geiger-Mueller (GM) tube. This GM tube is equivalent to, and can be cross referenced to, a number of other manufacturer model numbers. Three separate cross reference sources are provided in Attachment 1. Attachment 2 is an energy response curve for a similar Model 713 GM tube. Attachment 3 is a copy of an evaluation of various GM tubes for N-16 gamma radiation response (6 MeV). The Model Ni 17-1 is the equivalent to our GM tube and was provided by the same supplier. The intent of this information is to provide a basis for the ability of the new CREATS Actuation Instrumentation radiation monitors (and GM tubes in general) to conservatively detect radiation at an energy > 1.5 MeV, and thereby bound the analysis previously provided.
An equal opportunity employer 4 S )
89 East Avenue I Rochester, NY 14649 tel (585) 546-2700 vww.rge.com 6o015 ILoo151 ~~~~~~~~~~~~~~~~
Energy East Company
I declare under penalty of pe-jury under the laws of the United States of America that I am authorized by RG&E to make this submittal and that the foregoing is true and correct.
Any questions concerning this submittal should be directed to Tom Harding at (585) 771-3384.
Very truly yours, Executed on June 6, 2003 Robert C. Mecredy - Cross References of Geiger-Mueller Tubes - Model 713 Energy Response - The N-16 Gamma Radiation Response of Geiger-Mueller Tubes xc: Mr. Robert Clark (Mail Stop O-8-C2)
Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852 Regional Administrator, Region 1 U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 U.S. NRC Ginna Senior Resident Inspector Peter R. Smith, Acting President New York State Energy, Research, and Development Authority 17 Columbia Circle Albany, NY 12203-6399 Mr. Paul Eddy NYS Department of Public Service 3 Empire Plaza Albany, NY 12223-1350
Attachment 1 Cross References of Geiger-Mueller Tubes
18550/ZP1320/MX164 18550/ZP1 320/MX1 64 lOld type number 18550 INew type number llZP1320 IMullard type lMX164 I Detects libeta & gamma radiation Effective range l0,001-100 R/h l lPlateau 1500-650 V I lCathode 28% Cr, 72% Fe lFilling Neon, Argon, Halogen Height 44 mmI Diameter I10 mm I lWeight __
A Symbol
.~
BACK O 2001, Ake Holm, Sweden http://wl.871.telia.com/-u87127077/radctr/18550.htm 6/5/03
cross reference LND, INC.
Phone: 516-678-6141 - - Fax: 516-678-6704 - - E-mail : infolndinc.com Geiger Tube Cross Reference Chart Use the chart below to convert other manufacturer's part numbers toLND part numbers.
LND, NC CENTRONICS MULLARD MPIIJIPS TGM DETECTORS 7121 7P120 IFX146I 18503 f N/A 71210 I L ZP1201 I Li/ ZJ NA N/A 78016 ZP1210 MX20 18520 N/A 78017 1 ZP1220 r MX145 I 1 18545 1 N/A 7807 7 ZP1221 -:N/A F N/A _71 N/A IiI716 1 ZP1300 I K MX163i I 18529 1f 5-1 / C1300 7165 i1L ZP1301 N F N/A 7l N11 1 / C1301 714 _ 1 ZP1310 ir MX151 IF 18509 _ 1 N1161/_C1310 71412 ZP1311 MX189 IF -i r/ N116-1SE / C1312 7149 ZP1313 IN/A I IN/A N/A I I1 713 ::] I ZP1320 I MX164 IF 18550 1 N117-1 / C1320 1 I 713ZZ ZPI1321 N/A I NIA N117-IS / 1321 7139 ____ ZP1324 N/A IF N/A j N/A 72118 ZP130 7MX177 11155 ms II N/A 7124 L I ZP1400 IF MX147 18504 N/A 712 ZP1401 NA J N/A N/A 71210 ZP1402 INA --I N/A N/A 7224 ZP1410 M148 F 1850 11 N/A 72314 ZP1430 MX169 18526 N/A 72327 ZP1431 MX149 18506 N/A 7242 ZP1441 l 7 F 18515 1 N/A 72412 ZP1442 N/A IF N/A I I N/A I II II II II I htq://www.1ndinc.com/crosref htm6 6/5/03
Geiger Mueller Tubes Dead Time Correction 1.7~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GM tubes using conventional counting circuitry 1.T A lll ll11 1 1 S all exhibit counting losses due to the dead time t-I4- .
oEAniME COCREcTONI FtUECUN PATE I
l iYkI IA.` 1I factor, T. The factors cited in the Canberra tube data tables are based on the recommended operating CIe IA
- . SUJtED OUTING Rl E T.0EAD1TiME n.
Im lMaCR0ENS)
I I-mnT 11II4/JUYY III 1 1111 voltages and test circuits. The chart below enables the a ..- , . _- . . ... . .. ................
user to estimate the counting losses due to the dead time factor at high count rates. ._ r 11 Y/S .j 1 m' I. 1WflJl2dLLLLtIJi
. - 1 - . .. - 1 fil Wf %,fl0 ffi&l in 2,1f &,1fl 10 n *MEASURED CONT RATE(COUNTS PERSECOND)
TheFightTubeforYour . lication Direct or Near Equivalent Matrix nhrr Ttib Military Sreo tND TGM Centronic 2000 8767 7311 N1..2. _N1002 2000 Series 2001 N1002-1 Pancake 2006 73118 N1006 2011 7231 N1004 ZP1450 2100 : N202 _________
.2106, -7616 Equiv. _ _ ____.___
. ; 4 j-iE -i; .ii. ;; y lt t 0 ; 21114 . ZP 1400 .
2112 712 N205 :ZP1401
. 22N206 .Oseries ZP141O MICA End 2123 ._ -:N204 ________
>Window 0 P2123 _ N204IMHVI _ _.___
2126 5979 Equiv. 722 N201 __-_:__
2131; 7 7 T7 723 N21 0 ___;_.
P2131 Ai2-N21IBNC":_____-
-2135 72314 _____-_
2200 . 719 N107 2200 Series 2202 721 N106 Thin Wall 2206 720 N114 Beta 2211 725 N112 2216 Ni 19 2300 __ __ _ __ _ 72607777_ __
2305 . __-. __:_:_ N305 ZPI200 2300 Series q!N!2306- ______ _ N320
" 'Thi ck Wall 231 ______-__.__ N309 ________
Gamma 7 ' _ i':
!jj..'2314 _ . . O j'
- 2316- -V ____________4 T- ;; )
- 7A43: N310-
_________________-_____ 2350. ___ _2350 7802178017 - _____- - _
2406 716 N115-1 ZP1300 2411 714 N116-1 ZP1310 2400 Series 2416 713 N117-1 ZP1320
- Miniature 2420 Equivalent to Eurisys Mesures Model 4G60M 2422 Equivalent to Eurisys Mesures Model 3G1 0 2423 Equivalent to Eurisys Mesures Model 4G15 I_____
Attachment 2 Model 713 Energy Response
l0 8
6 4 0 20 0~~~~~~~~~
101 1 2 10 Energy (keV)
Photon Energy Response Of 713 "thin wall" GM tube, normalized to unity at 662 keV with beam perpendlcular to detector wall.
Attachment 3 The N-16 Gamma Radiation Response of Geiger-Mueller Tubes
The N-16 Gamma Radiation Response of Geiger-Mueller Tubes Page 1 of 4
[Note: This article Isreproduced from: Proceedings of the Eighth International Congress of the International Radiation Protection Association (IRPA8), May 17 - 22, 1992, Montreal, Canada, pages 652 - 655.]
The N-16 Gamma Radiation Response of Geiger-Mueller Tubes D. J. Allard, A. M. Nazarali and C. E. Chabot Arthur D. Little, Inc., Acorn Park, Cambridge, MA 02140; WIPP, P.O Box 2078, Carlsbad, NM 88220; University of Lowell, 1 University Ave., Lowell, MA 01854 ABSTRACT - This paper describes an evaluation of various Geiger-Mueller (GM) tubes for N-16 gamma radiation response. The work is an extension of investigations regarding the various radiation response characteristics of these devices. Previously acquired photon energy response data were from 10 kev to 1.25 MeV. Utilizing the 6 MeV gamma ray of N-16, the pair production interaction response with different GM tube styles was studied.
The new relative response ratios of N-16 to Cs-137 are presented with a discussion of results. Additionally, two full energy response curves are presented.
INTRODUCTION AND METHODS Recently evaluations for radiation response characteristics of GM tubes with respect to beta energy, dose rate, photon polar, and photon energy response have been performed in conjunction with the NRPB in the UK (Allard 1987). That work investigated photon energy response from 10 kev to 1.25 MeV. The dominant interactions in this energy range are photoelectric and compton scattering. An investigation presented herein extended the photon energy testing into the 6 MeV range using an N-16 source. At this energy the pair production Interaction will become more apparent with respect to detector response. Various styles of "pancake",
mica end window, thin wall, thick wall and energy compensated GM tubes were included In this study. The mechanical aspects of the various styles are noted in Table 1 and TGM Detectors' product specifications. In this evaluation a portable high voltage supply/digital scaler was set up adjacent to the N-16 source at the University of Lowell's research reactor facility.
This source has been fully characterized for the specific purpose of measuring response of portable radiation protection instruments (Neault, 1980). It should be noted that a 1.5 Inch thick iron plate was placed in front of the source to attenuate the high energy beta component and provided secondary electron buildup. This arrangement also furnished an exposure scenario that is similar to what is encountered in a nuclear power plant. The various GM tubes were irradiated with the N-16 source at known exposure rates, and observed counts and times recorded. Efforts were made to obtain at least 10,000 counts for statistics. Similarly, the same http://hps.org/hpspublications/articles/allard.htm6 6/5/03
The N-16 Gamma Radiation Response of Geiger-Mueller Tubes Page 2 of 4 detectors were irradiated with a calibrated Cs-137 source, The background was measured in each area and corrections applied. Collected data were then used to determine a count rate per unit exposure rate value. A response ratio of N-16 to Cs-137 was then calculated in order to fold this information into the previously acquired photon energy response measurements made at NRPB.
RESULTS AND DISCUSSION Table 1 is a summary of the N-16 to Cs-137 response ratios. As noted, the relative response ratio varied from nearly unity to about two. Considering the interactions and number of secondary charged particles produced, this would be expected. If one were to plot photon fluence versus photon energy, a peak would be observed below 200 keV. This is mentioned in that GM tubes are basically photon counters, and will more or less exhibit the same generally shaped curve. However, differences in GM tube construction does cause notable discrepancies at high photon energies and variable peak spread at low photon energies. Figures 1 and 2 are energy response curves for a bare and energy compensated version of a GM tube. The data presented are a combination of the NRPB and this study's results (i.e. N-16 data point).
Table 1. Ratio of N-16 Gamma Response Relative to Cs-137 I GM _ Comments I N1002/8767 1.88 Through mica window. l l N1002/BNCl 1.9 Through mica window.
l N1003 1.96 Through mica window.
N201 1.71 Through 0.047" SS wall.
l N205 1.90 Through 0.010" SS wall. l N210/BNC 1.58 Through 0.109" SS wall. l H220/7840 I 1.90 llThrough mica window.
N107 1.61 Through 30 mg/sq.cm SS wall.
l N112 1.65 Through 30 mglsq.m SS wall.
l N114 1.73 Through 30 mg/sq.cm SS wall.
l N115-1 1.09 Through 80 mg/sq.cm SS wall.
I NilS-iSi 1.42 Through 80 mg/sq.cm SS wail with high Zflter.
l N116-1 1.24 Through 80 mg/sq.cm SS wall. l N116-1SE l1.3 Through 80 mg/sq.cm SS wall wlth high Z fiter.
N117-1 1.74 Through 30 mg/sq.cm SS wall. J l Nli7-lS 1 Through 30 mg/sq.cm SS wall with high Z flter.
N118-1 1.03 Through 120 mg/sq.cm SS wall.
N118-iS 1.49 Through 120 mg/sq.cm SS wall with high Z filter. l N302 1.76 Through 0.020" SS wall.
N305 Through 0.010" SS wall.
htp ://hps.org/hpspublications/articles/allard.html 6/5/03
The N-16 Gamma Radiation Response of Geiger-Mueller Tubes Page 3 of 4 l N305S 11 1.99 ll Through 0.010" SSwallwith high Zflter.
NP315-6 1 Through 0.020' SS wail, platinum plated Inside.
NP334-6 1.48 Through 0.012" SS wall, platinum plated Inside.
NP358-6 1.69 Through 0.009" SS wall, platinum plated nside.
GM tubes will respond to any charged particle that enters their sensitive volume. A discharge may be produced by charged particles directly entering the tube through a mica window or thin cathode wall. Alternately a discharge may result from secondary electrons; thus, the construction of any given GM tube will greatly influence an energy response curve by the complex contribution of primary photon transmission/attenuation and secondary particle production/attenuation at various depths in the GM tube window, wall or outer energy compensation filter. Again, the data shown in Figures 1 and 2 are the relative response values for the GM tube on an exposure rate basis. Because Cs-137 is a very common calibration source, by convention 662 keV is used as the normalization point. This allows comparison of tubes that may have quite different gamma ray sensitivities due to overall size.
15 Ene rgy (eV)
Fig. 1: Photon Energy Response of N116-1 miniature "thin wall" GM tube, normalized to unity at 662 keV with beam perpenBdicular to detector wall.
As can be noted in Figure 1, the "thin wall" style GM tube with an 80 mg/sq. cm window provides excellent transmission for low energy photons below 100 keV. However, relative to Cs-137 t does over-respond by nearly a factor of 13 at 70 keV. This results from the high photon fluence being transmitted through the cathode wall, a high Interaction probability, and the subsequent discharge events being counted. In the intermediate energies the response is relatively flat, but does begin to increase slightly above 1 MeV. The latter is due to the ncrease in number of secondary charced particles from pair production. Over-response below about 200 keV http://hps.org/hpspublications/articles/allard.htmI 6/5/03
The N-16 Gamma Radiation Response of Geiger-Mueller Tubes Page 4 of 4 may be reduced by adding a thin layer filter of high atomic number metal over the tube with an appropriate open area. This effectively attenuates a portion of the low energy photon fluence. With proper engineering, one can easily obtain a +/-20% response from 50 keV to 1.25 MeV using a "thin wall" GM tube and energy compensation filter. However, as can be noted by comparing the response curves in Figures 1 and 2, the high atomic number filter actually causes an increased over-response in the 6 MeV range compared to the bare tube. This is no doubt due to energetic secondaries produced in the energy compensation filter, passing through the GM tube cathode wall and causing a discharge.
1.6 ex 1 ' ' ' A2 ' I i];
Energy keV)
Fig. 2: Photon Energy Eesponse of N116-1SE energy compensated miniature "thin wall" GM tube, normalized to unity at 662 keV, same geometry.
Acknowledgement - The authors wish to thank TGM Detectors, Inc.
(Waltham, MA, U.S.A.) and Centronic Limited (Croydon, U.K.) for their financial support of this project.
REFERENCES
- 1. Allard, DJ., Geiger-Mueller Tube Radiation Response Characteristics, Proceedings of the Health Physics Society's 21st Midyear Topical Meeting on Power Reactor Health Physics, Miami, FL, 1987.
- 2. Neault, P.]., The Dosimetry of Nitrogen-16, University of Lowell Masters Thesis, 1980.