ML20080E116

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Rev 0 to Procedure 08-S-04-200, Chemistry Instruction: Operation of Ge(Li) Counting Sys,Safety Related
ML20080E116
Person / Time
Site: Grand Gulf  Entergy icon.png
Issue date: 09/02/1981
From:
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20080E069 List:
References
08-S-04-200, 8-S-4-200, NUDOCS 8308300730
Download: ML20080E116 (12)
v • d • e


Text

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PLANT OPERATIONS MANUAL I

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Volume 08 , 08-S-04-200 Section 04 Revision 0 j f

Date: 9/2/81 l

CHEMISTRY INSTRUCTION

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OPERATION OF Ge(Li) COUNTING SYSTEM SAFETY RELATED Prepared: } w Reviewed: 4/ M , / h f

' Technical ReviC } 'In M en' dent Keview PSRC: /O [/ --

e f/2dds Approved: / w_ </ e- _

Plant Chemist Concurrence: fn! k# "_

Chebistry/ Radiation Control Superintendent List of Effective Pages:

  • Page: Revision 1-11 Rev. 0 Is -

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION

. ITitle: Operation of Ge(Li) INo.: 08-S-04-200 (Revision: 0 lPage: 1 l I Counting System l l l l

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1.0 INSTRUMENT DESCRIPTION The Ge(Li) Counting System is primarily a ganmaa isotopic analysis system. The system uses high resolution lithium-drifted germanium detectors (Ge(Li)). The Ge(Li) Counting System also performs several utility functions such as quality control and data management.

, There are two Ge(Li) Counting Systems, one located in the Counting Room (CR',

I and one located in the Hot Lab (HL). The two systems shall be considered identical, except as noted below. Those components identified as located in the Clean Lab (CL) may be connected to either system.

l The individual components that comprise the Ge(Li) Counting System are:

1.1 H-P 9845T Desktop Computer 1.1.1 H-P 98455, option 312, I/O ROM 1.1.2 H-P 9845B, Qption 313, Mass Storage ROM 1.2 H-P 7906MR, Option 102, Disk Drive 1.3 H-P 13037C, Disk Controller l 1.4 H-P 98041A, Disk Interface 1.5 Canberra Model 7500 Ge(Li) Detector (CR-2, HL-1) 1.6 APT Model SPG-16, Lead Shield (CR-2, HL-1) 1.7 ND 66, MCA (CR-16K, HL-8K) 1.8 ND 575, 80 MHz ADC (CR-3, HL-1) 1.9 Ortec 401A, NIM Bin.

1.10 Ortec 572, Amplifier 1.11 Ortec 459, High Voltage Supply 1.12 APT NDAV-100, LN2 Monitor 1.13 H-P 98035A, Real Time Clock

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CRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTIOk .-

lTitlo: Op 2rcticn of G3(Li) lNo.: 08-S-04-200 lRavisicn: 0 lPcgs: 2 . l l Counting System l l l l.,

1.14 H-P 7225A, X-Y Plotter (CR only) 1.15 TI 820 RO, Impact Printer 1.16 H-P 2621P, CRT/ Terminal (CL only) 1.17 Sykes Conma-Stor II (CL only) 1.18 Anderson-Jacobsen AD342D Modem and Acoustic Coupler (1 set)

2.0 REFERENCES

2.1 Chemistry Precedure 08-S-03-1, Qualifications of Chemistry Program 2.2 Chemistry Procedure 08-S-03-7, Control of Chemistry Support Equipment 3.0 DEFINITIONS 3.1 Daily - Once per day or prior to use, whichever is less frequent.

3.2 Weekly - Once per week or prior to use, whichever is less frequent.

NUfE Computer conumands will be enclosed in brackets, e.g. , [ CONT]. )

s 4.0 PREREQUISITES 4.1 Standard Mixed Ganana Sources 4.2 Eu-152 Source 5.0 PRECAUTIONS 5.1 Power to the instrument should be lef t on to provide system stability.

5.2 Handle radioactive samples in accordance with radiological safety procedures.

5.3 Exercise extreme care to keep the detector and shield free from radioactive contamination.

5.4 Prior to use, ensure required functional checks and calibrations are current.

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION l

Title:

Operation of Ge(Li) lNo.: 08-S-04-200 l Revision: 0 lPage: 3 l

.I Counting System l l l l

.h 5.5 The Ge(Li) crystals mast be maintained at liquid nitrogen temperatures at all times. Liquid nitrogen must be maintained in the devars at all times with the gross weight of the dewars and nitrogen greater than 45 pounds.

5.6 The Ge(Li) crystal cold finger should never be removed from the liquid nitrogen for more than 45 seconds.

5.7 The Ge(Li) Counting System has a manual reset on loss of electrical power. The high voltage to the Ge(Li) crystals must be turned off and adjusted to zero prior to re-energizing the system.

5.8 On loss of power, the disk drive should be turned off prior to re-energization.

5.9 Disk fault lights should be reported immediately to the Lead Laboratory t Chemist.

5.10 When shutting down the disk drive, the RUN/STOP switch is placed in the STOP position and the DOOR OPEN light must illuminate prior to shutting l off the disk drive power.

f 5.11 Immediately set the RUN/STOP switch to STOP whenever a loud grinding noise is detected in the disk drive.

( 6.0 INSTRUCTIONS 6.1 Instrument Startup 6.1.1 Adjust high voltage power supply to ZERO.

6.1.2 Turn Nim Bin ON.

6.1.3 Turn high voltage power supply power ON.

6.1.4 Slowly increase the high voltage to the operating voltage listed in the Instrument Log Book.

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4 tore Voltage should be increased at a maximum rate of 1000 volts per )

minute.

6.1.5 Turn environmental cabinet air conditioner ON.

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION l

Title:

Operation of Ge(Li) INo.: 08-S-04-200 l Revision: 0 lPage: 4

  • l l Counting System l l l l .

6.1.6 Turn disk drive power CN.

NOTE Verify DOOR OPEN light is illuminated. Report any other disk drive fault lights to the Lead Laboratory Chemist.

6.1.7 Turn disk controller ON.

6.1.8 Turn disk interface ON.

6.1.9 Turn I/O Expander ON.

6.1.10 Insert the systee operating cartridge in the disk drive.

6.1.11 Place RUN/STOP switch to RUN.

NOTE The DRIVE READY light should illuminate af ter approximately 60 seconds. If the DRIVE FAULT illuminates, do not set the RUN/STOP switch to STOP. Report any abnormal conditions to the Lead Laboratory Chemist. ~

6.1.12 Depress the AUTO LOAD key on the HP 9845 computer. )

6.1.13 Place a "Ge(Li) Counting" tape in the right hand tape drive

(":T15") of the HP 9845 computer.

6.1.14 Turn HP 9845 computer ON.

6.1.15 For the CR system, turn the TI 820 printer ON.

NOTE Verify printer display is 001. Report any other displays to the Lead Laboratory Chemist. ,

6.1.16 Turn the ND66 MCA power ON.

6.1.17 The remaining switch settings should be verified per the Instrument Log Book.

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION

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Title:

Operation of Ge(Li) lNo.: 08-S-04-200 l Revision: 0 lPage: 5 l 1 l Counting System l l l l p

i 6.1.18 The interconnection of the equipment should be verified per the Instrument Log Book.

6.1.19 The instrument may be placed in the standby mode by any or all of the following steps:

a. Disk drive RUN/STOP switch to 0FF
b. HP 9845 computer power OFF ~
c. TI 820 printer power OFF
d. ND 66 MCA power OFF 6.2 Instrument Operation I

i 6.2.1 Verify instrument startup in accordance with section 6.1.

I l 6.2.2 Verify instrument is within prescribed calibration due dates. ,

6.2.3 Verify required functional checks have been performed.

6.2.4 Select the program to perform the desired task from the sof tware

{ package described in the following Chemistry Instructions:

a. Chemistry Instruction 08- 212, Germanium Spectroscopy Software. *
b. Chemistry Instruction 08-S-04-213, Quality Control Sof tware.
c. Chemistry Instruction 08-S-04-214, Liquid Radwaste Software.
d. Chemistry Instruction 08-S-04-215, Gaseous Radwaste Sof tware.
e. Chemistry Instruction 08-S-04-216, Utility Software. l
f. Chemistry Instruction 08-S-04-217, Data Base Software. ,
g. Chemistry Instruction 08-S-04-218, Sampling Schedule Software.
h. Chemistry Instruction 08-S-04-219, Remote Terminal Handling Software.

6.2.5 Load the selected program into the HP 9845 computer by either:

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION l

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Operation of Ge(Li) INo.: 08-S-04-200 l Revision: 0 lPage: 6 l l Counting System l l l I, -

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a. [ LOAD "FINAME: C12"], [ EXECUTE] where FINAME is the program file specifier.
b. Press ' appropriate special function key.

6.2.6 Start the program by pressing the (RUN] key.

6.2.7 set the desired I/O devices using the following select codes:

a. Thermal printer - 0
b. External printer - 5
c. Plotter '- 7, 5
d. Real time clock - 9
e. Multichannel analyzer - 11 -
f. Disk drive - 12
g. Graphics - 13
h. Left tape drive - 14 .
i. Right tape drive - 15
j. Citr - 16 6.2.8 Respond to the program prompts and instructions. Refer to appropriate software instructions for additional information on each program.

6.2.9 When the instrument will not be used for the following eight hours, it may be placed in the standby mode.

6.3 Ge(Li) Counting ,

6.3.1 Verify instrument startup in accordance with step 6.1.

6.3.2 Verify instrument is within prescribed calibration due dates.

6.3.3 Verify required functional checks have been performed.

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, GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION h

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Title:

Operation of Ge(Li) INo.: 08-S-04-200 l Revision: 0 lPage:- 7 l f; l Counting System l l l l

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6.3.4 Prepare the sample per Chemistry Instruction 08-S-04-14, Sample

-Preparation for Counting.

6.3.5 Samples should be centered on shelf 2 or higher, except for marinelli beakers and 1 liter bottles.

6.3.6 Close and latch the shield lid.

6.3.7 Load and run the GSMCA program in accordance with section 6.2 to acquire a spectrum and transfer the data to the HP 9845 ,

computer. l 6.3.8 Use the OSRAP program to analyze the spectrum.

6.3.9 Refer to Chemistry Instruction 08-S-04-212, Germanium Spectroscopy Software, for additional information.

6.4 Functional Check 6.4.1 Daily Source Count

a. Verify instrument startup in accordance with section 6.1. '
b. Place an Eu-152 source of known count rate on shelf 2 and 2

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( .. close shield.

c. Load and run the GSMCA program in accordance with section 6.2 to acquire a spectrum for 600 seconds and transfer data to the HP 9845 computer, t
d. Use the QCNDLY program to analyze the spectrum.

(1) The results of the QCNDLY program will be stored in file QFILEn. Where n is the detector number.

(2) The source number and fractional amount of the source (N.F) will be on the Eu-152 source. -

(3) The assay date and time will be on the Eu-152 source.

e. If the current date is wrong or the time varies from correct time by + 1 minute, the GSCLCK program must be run to correct the internal clock.

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  • s GRAND GULF NUCLEAR STATION 7 CHEMISTRY INSTRUCTION l

Title:

Operation of Ge(Li) lNo.: 08-S-04-200 l Revision: 0 lPage: 8 1

l Counting System l l l l,

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f. Report any test failure, i.e. , flag = 0, to the Lead Laboratory Chemist.
g. Refer to Chemistry Instruction 08-S-04-213, Quality Control Software, for additional information.

6.4.2 Weekly Background Count

a. Verify instrument startup in accordance with section 6.1.
b. Load and run the GSMCA program in accordance with section 6 4.

(1) Verify that there are no sources inside or in the general area of the shield.

(2) Collect a background spectrum for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> with the sample stand in the shelf 2 position.

(3) Transfer the spectrum to the HP 9845 computer.

c. Use the QCBKG program to analyze the background spectrum.

(1) The results of the QCBKG program will be stored in file 5 QCBKGn. Where a is the detector number. .

d. Report any test failure, i.e. , flag = 0, to the Lead Laboratory Chemist.
e. Refer to Chemistry Instruction 08-S-04-213, Quality Control Software, for additional information.

6.4.3 Weekly System Check

a. Verify instrument startup in accordance with section 6.1.

'b . Load and run the GSGETM program in accordance with section 6.2. -

(1) Transfer spectrum WTEST from the fixed disk (:D12) to the HP 9845 computer.

c. Load the GSRAP program to analyze the spectrum.

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION

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Title:

Operation of Ge(Li) lNo.: 08-S-04-200 l Revision: 0 lPage: 9 l l Counting System l l l l O

i (1) Use parameters as stored with spectrum.

d. Examine printout for consistency with previous results.
e. Refer to Chemistry Instruction 08-S-04-212, Gasuna Spectroscopy Software, for additional information.

6.5 Calibration 6.5.1 Verify instrument startup in accordance with section 6.1.

6.5.2 Obtain calibration sources meeting requirements of Reference 2.2.

6.5.3 Load and run the GSEDAT program in accordance with section 6.2 to enter the calibration source data.

6.5.4 The standards should be prepared per Chemistry Instruction 08-S-04-14, Sample Preparation for Counting.

6.5.5 Samples should be centered on the shelf and the lid closed when counting.

l l 6.5.6 Load and run the GSMCA program in accordance with section 6.2. I L

6.5.7 Acquire a spectrum for sufficient time to accumulate greater than 10,000 net counts in each peak used in the efficiency curve determination.

6.5.8 Transfer the spectrum to the HP 9845 computer using the GSMCA 3 program.

6.5.9 Use the GSEECL program to calculate the efficiency curves for each geometry code and shelf number.

a. Geometry codes for each geometry are:

(1) ILMB liter marinelli beaker ,

f (2) 4 LMB liter marinelli beaker (3) ILBT liter poly bottle (4) OGVL - 14 ml off gas vial C

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION l

Title:

Operctica of G3(Li) INa.: 08-S-04-200 lRsvision: 0 lPcgs: 10 -

l l Counting System l l J .

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(5) CART - charcoal cartridge (6) 1DVL - 1 dram Vial (7) WPCH planchet (8) FILT - filter paper - 47 mm (9) WHAT - Whatman 542 filter

b. Acceptable shelf numbers are:

(1) 0 - directly on top of crystal (2) 1 - first shelf of sample holder approximately 1 cm from crystal (3) 2 - second shelf of sample holder approximately 3 cm from crystal (4) 3 - third shelf of sample holder approximately 10 cm from crystal (5) 4 - fourth shelf of sample holder approximately 15 cm from crystal.

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6.5.10 The efficiency curve % difference shall *2e less than +.5% for each peak used in the calibration.

6.5.11 Sources for Functional Checks

a. Center the check source on shelf 2 and close shield,
b. Count the sample at least 10 times for 600 seconds and calculate the average count rate.
c. Calculate the fractional amount of the source in relation to ~

the calibration daea stored by the CSEDAT program for the appropriate source.

d. Label the check source with the correct source number and fractional amount (NF) and assay date and time.

GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION

  • 'lTitle: Operation of Ge(Li) lNo.: 08-S-04-200 l Revision: 0 lPage: 11 l

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. l Counting System l l l l

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i 6.5.12 Refer to Chemistry Instruction 08-S-04-12, Gamma Spectroscopy Sof tware, for additional information.

7.0 DOCUMENTATION / CORRECTIVE ACTION 7.1 Document results on proper reporting forms per Chemistry Procedure 08-S-03-3, Document Control.

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