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Intervenor Exhibit I-GANE-6,consisting of Re Replacement of Moving Air Particulate Monitor Detector
	ML20115G074
Person / Time
Site:	Neely Research Reactor
Issue date:	05/20/1996
From:	Copcutt B; Neely Research Reactor, ATLANTA, GA
To:	;
References
	REN-I-GANE-006, REN-I-GANE-6, NUDOCS 9607180237
	Download: ML20115G074 (6)
	v • d • e

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/" M. . . , "'q Georgia Institute of Technology T[g.{[0 NEELY NUCLEAR RESEARCH CENTER 3

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I. 900 ATLANTIC DAIVE N.a [ 2 ATLANTA. GED AGIA 30332-0425 96 JUL 10 A{0;1(_

0FFICE nF S narc ~r >ECRETMY c. r July 24,'1990j,j 4 w' 1t MzMoRAMooM To2 R.A. Karam /

From: B. Copeutt /30 7 A~._b

Subject:

Replacement of moving air particulate monitor detector Yesterday the moving air particulate monitor (MAP-1) detector was replaced due to increased background pulses being generated by the system. Yesterday morning, operators noticed that the MAP background was approximately 6 cps instead of the usual l cps.

Checks were made of the filter bank monitor and kanne chamber and both showed normal background levels. The MAP filter paper was hand monitored with a portable instrument and also showed no detectable activity levels. A check of system electronics revealed that spurious pulses were being generated by the detector / preamp assembly.

The detector was replaced with another thin end window type GM tube. Exact specifications for the old detector were not available. The old detector was manufactured by Nuclear Chicago, a company that has long been out of business. The new tube, a Ludlum Model 44-7 (see attached brochure) has identical end window dimensions and otherwise appears comparable to the old. The protective wire screen was removed before the tube was installed in the MAPI system. A full annual calibration was carried out on the replacement detector and it was observed that the new system has an increased efficiency compared to the old (approximately 70h greater response for Ra-226 and 50% gre' ster for Co-60) .

cc: B.K. Revsin NUCLEAR REGULATORY COMMISSION Docket No. So -/6 a- Resd EXHlBIT NO. (.o in the rnatter of_h d ,1 J D D statt O Applicant 21ntervenor O other Q Eldentified B%eceived O Rejected Reporter 6) d oj pg Date ,f[Z e / 9 (, Witness 6c, Te'e n 542507 GTAIOCAATL Fan. 404 894 3120 (Ven y 404 8944951) 8 I A U ut o' tee Umversdy System o' Georg a An Ecual Edxaison and Empoyment Opportunay insntution

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. . - ' W/4'f/ 9 SV- -

NEELY NUCLEAR RESEARCH CENTER 3

Minor Change Procedure 4200

Number By: Revision 00 tvannen IN GTRR DESIGN Approved 04/28/t Date: / /

Page 3 of 4 APPENDIX A '

10 CFR 50.59 SAFETY EVA1'tATION QUESTIONNAIRE FACILITY MODIFICATION NO: N TITLE:

GM 7?shp NDuermen en M RPI 1.

Will the probability of the occurrence or the consequences of an accident or malfunction of equipment important to safety previously increased?

evaluated in the safety analysis report be

[yes/no] A/ C .

2. Will the possibility for an accident or malfunction of a difforent type than evaluated previously in the safety ,

analysis report be created? [yes/no) A/c

)

3. Will the margin of safety as defined in the basis for any technical specification be reduced? [yes/no) /d o 4.

Is the proposed change an unreviewed safety question?

[yes/no] rd o EQ21: If additional space is needed to justify conclusion (s) please attach extra sheet (s).

n. nmc ,j w.s h. G-

@R , i, d: h.>-21. elcw La Lk- ~ wL (Mc sJ 4T4yfu ). s (-e y c oATE:

PREPARED BY:

% =2 'f M' APPROVALS:

Director NNRC:

b/J M.d}thu- h/c2Y,/90 Nuclear Safeguards Committee: # ' -

!> udlum BETA-GAMMA DETECTORS i

i i

The Detector holder features a rotary beta shield with 1,000 mg/cm8 stainless steel wall thickness.

3 OPERATING POINT: 900 volts.

DIMENSIONS: 1-3/16" diameter by 6%" long.

C LL:_.- LLL== WEIGHT: 12 oza.

3 Wall. THICKNESS: 30 mg/cm8 stainless steel.

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EFFICIENCY FOR RADIUM 226: 1,700 counts per min.

per MR/Hr.

QUENCH: Halogen.

MODEL 44-6 THIN WALL GElGER-MUELLER PRODE

'7 . .s L (l <b,'

)t W f(M V WINDOW: 1.4 to 2.0 mg/cm8 mica.

WINDOW DIAMETER: 1-3/32" diameter.

Ammm.,44PY. . Y. AY.c

~

T="" WALL: 0.046 inches stainless steel, plus 0.062 aluminum y *e: w m eu..-. m ~ golge7, MOUNTING: Aluminum holder.

DIMENSIONS: 1%" diameter by 5%" long.

WElGHT: 10 oz.

Replaceable GM tube MODEL 44-7 Removable protective wire screen.

END WINDOW GEIGER-MUELLER PROBE WINDOW: 1.5 to 2 mg/cm8 mica WINDOW DIAMETER: 1.75" MOUNTING: ANminum holder, handle and window protector.

DIMENSIONS: 2%" wide,11" long 1.050" dia. Handle.

WEIGHT: 12 oz.

i MODEL 44 9 l PANCAKE GEIGER-MUELLER PROBE The beta scintillator is similar in performance to a 1.5 mg/cm' end window G. M. detector with the added advantage of lower gamma background and the ability to utilize discnmanation. Carbon 14 f ;

detection is possible with reasonable gamma re}ection.

NE/102 plastic crystal,0.01 thick. (thinner DETEC~.

crystals on request) k,

~

WINDOW: 1 mg/cm8 aluminized mytar.

EFFICIENCY: Function of discnmination setting.

OtMENSIONS: 6%" long by 2" diameter.

WEIGHT: 12 oz.

MODEL 44-1 BETA SCINTILLATOR LUDLUM MEASUREMENTS,INC.

501 Oak Street

Sweetwater Texas 79556 e Telephone (915) 235-5494 12-1 60 Pr.eted in U $ A

RS-67 bC f b CAUBRATION DA A SHEET MANUFACTURER /MODEL NUMBER: # At I SERIAL NUMBER: y/A NEXT CAUBRATION DATE: 7 -17 cr i LAST CAUBRATION DATE: i 'i - U PULSER SERIAL NUMBER: 1"d*,Ec_ VOLTMETER SERIAL NUMBER: -fA l CHECKED: /4 BATTERY / BATTERIES REPLACED: s/A ZERO CHECK: oe GEOTROPlSM CHECK: YA-HIGH VOLTAGE: 9 oo y,I N ees RANGE AS FOUND AS LEIT LIMITS 3.1 31 17 2.99-1.c*

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ML20115G074

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