ML20080E123
| ML20080E123 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 06/27/1983 |
| From: | MISSISSIPPI POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20080E069 | List:
|
| References | |
| 08-S-04-220, 8-S-4-220, NUDOCS 8308300732 | |
| Download: ML20080E123 (32) | |
Text
_ _ _ _ _ _ _ - _ _
PLANT OPERATIONS MANUAL l
O Volume 08 l
08-S-04-220 i Ssetion 04 Revision 0 Date: 6-27-83 CHEMISTRY INSTRUCTION VENTILATION EXHAUST GASEOUS MONITORING SYSTEMS OPERATION SAFETY RELATED l
Prepared: 7[
Reviewed: my Am / h[ d Technical Review / Independent Review
[
Approved: d&w [/((/[]
Chemis t ry/ Rad ia t ion ' Cor.t ro l S upe rint end ent Concurrence: ///A y70- 4/et./r3 Assistadt Plant Manager ' '
List of Effective Pages:
Page ymmm . -
..t..itmp Acts. I-II A v51 List of TCN's Incorporated: ;, ,
p Revision dk..)J TCN No. .3, J, , di .. .J ,
o WORD PROCESS::NG T a
0 p 8308%$
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., GRAND GULF NUCLEAR STATION -
. CHEMISTRY INSTRUCTION
' Title V&ntilation Exhau;t Gar 4ous No.: 08-5-04-220 ;Rcvision: O Patger 1
. . . Monitoring Systems' Operation l
l 1.0 PURPOSE i To provide instructions for operating the radiological monitoring subsystems which monitor gaseous effluents from the Fuel Handling Area, Standby Gas Treatment A and B, and the Containment, Turbine and Radwaste Buildings.
2.0 REFERENCES
2.1 GEK-73680, Process Radiation Monitoring System,Section III, June, 1979, MP&L Access Number 460000943 2.2 Eberline Instrument Corporation Technical Manuals as follows:
2.2.1 Particulate, Iodine and Noble Gas Monitor, Model SPING-4, MP&L Access Number 460001758 2.2.2 Accident Ranoe Monitor, Model AXM-1, MP&L Access Number 460001760
{ 2.3 Applicable MP&L Calibration and Sampling Procedures 3.0 DEFINITIONS f
3.1 General Electric and Eberline Ventilation Monitoring Subsystems - The
_ Vent Release Sampling and Monitoring Subsystems which continually
(- sample and monitor the gases being vented through the exhaust venta from the Fuel Handling Area SBGT A and B Containment, Turbine and Radwaste Buildings. (The SBGT monitors do not have a GE subsystem). A small portion of the bulk gas volume is extracted by isokinetic probes and inlet lines from the ventilation system just prior to discharge into the atmosphere. The representative gas sample is passed through the detector systems where particulates (if any) and lodines (if any) are filtered and measured, (particulates and iodine are measured in line by the Eberline System only) then passed through the noble gas detector's chambers for measurement before being returned to the ventilation exhaust. The two systems (General Electric and Eberline), which serve as "back up" systems to each other, sample and monitor the same ventilation streams and provide the means by which gaseous, particulate and iodine grab samples may be obtained for analysis.
3.2 General Electric Monitoring Subsystems 3.2.1 Each subsystem continuously monitors the flow and gama radiation intensity of the ventilation exhaust gases. Particulates and iodines are continuously filtered. Although there are no provisions for continuous monitoring of the activities collected by the filters, the particulate and iodine filters are easily changed-out for periodic laboratory analyses. The general components of the subsystems are:
m
GRAND GULF NUCLEAR STATION ,
CHEMISTRY INSTRUCTION ,
Titlas Ventilcticn Exhiunt Ga;cous No.: 08-5-04-220 Rsvision: 0. Pcge.: 2
- Monitoring System 2' Oparction ,
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- a. Isokinetic probes and inlet lines which extend into the ' .)
exhaust vents
- b. Sampling panels containing exchangeable filters and the necessary valves for regulating sample flow
- c. Radiation sample chambers with 3 G-M tubes
- d. Vacuum pumps
- e. Log count rate meters (LCRMs) with trip circuits
- f. A trip auxiliary unit
- g. Two strip chart recorders with one pen for each system 3.2.2 Sample Panels - The panels from which ventilation and sample flow rate is controlled and from which grab samples (iodines and particulates) may be obtained. The panels are identified as follows:
- a. SD17-P001.- Radwaste Building Vent
- b. SD17-P002 - Containment Building Vent
- c. SD17-P003 - Fuel Handling Area Vent /
- d. SD17-P004 - Turbine Building Vent 3.2.3 Radiation Monitoring Panels - The panels located in the Operations_
Control Room by which alarm setpoints may be established, continuous radiation monitoring of gaseous effluents may be maintained, and routine radiation source checks may be performed are identified as follows:
- a. P600 (1) Strip Chart Recorder,1D17-RR-R600 (a) Red Pen - Redwaste Building Ventilation (b) Black Pen - Containment Building Ventilation l
, GRAND GULF NUCLEAR STATION .
, CHEMISTRY INSTRUCTION Titist Wentilctinn Exhaust G = ous Ns.: 08-5-04-220 . Revision: 0 lPaga 3 Monitoring Systema' Opnration (2) Strip Chart Recorder, 1D17-RR-R607 -
(a) Red Pen - Fuel Handling Area Ventilation l (b) Black Pen - Turbine Building Ventilation 1
- b. H13 - P604 Housing the following Log Count Rate Meters (LCRM)
(1) K602 - Radweste Building Vent (2) K603 - Containment Building Vent (3) K619 - Fuel Handling Area Vent (4) K620 - Turbine Building Vent 3.3 Eberline Monitoring System i
Each Eber11ne Monitoring System consists of the SPING-4 Monitoring Subsystem which is operable during normal conditions and the Accident (
Monitoring Subsystem (AXM-1) which automatically goes into operation when the radiation level at the SPING-4 Mid-range noble gas monitor (CH-7) is sufficiently high to cause the activation of the high radiation alarm, or when the SPING-4 is placed in the " PURGE" condition. Each subsystem is
('-
' equipped with the necessary flow control valves, vacuum pumps, LCRM's, particulate and iodine filter holders (in the SPING-4 and GSP-1 detector l chambers), gaseous sampling ports, alpha detectors (SPING-4 only), beta '
and gamma detectors. The SPING-4 subsystem and the AXM-1 subsystem, which consists of the Grab Sample Pallet (GSP-1), the Noble Gas Pallet (NGP-1) and the Data Acquisition Module (DAM-4), are self-contained microcomputer based radiation detector systems. Both systems utilize a micro-computer which performs the tasks of data acquisition, history management, operational status checks, alarm determinations and actuations, and operator / system communication at the control terminal. A digital display is maintained, providing total display of data, status and alarm points. In general terms, activity is sensed by the detector, creating a signal which is processed by the IB-X interface, then input into the input-output board where these signals are converted to count <
rate by the microcomputer which performs all mathematical calculations and control functions. !
3.3.1 SPING-4 Subsystem
- a. The particulate, iodine, low-range and mid-range noble gas detectors are housed in the SA-13 Sampler Assembly. The high range noble gas monitor is contained in the SA-9 assembly.
v
GRAND GULF AICLEAR STATION CHEMISTRY INSTRUCTION, Title Vcntilction Exhaur.t Gazeous No.: 08-5-04-220 Ravision O Page 4 '
Monitoring Systema' Opsrs, tion ,
Sample intake entering the SA-13 Sampler Assembly passes ).
first through a filter paper on which any particulate is deposited, then through the charcoal cartridge which traps the lodines, then into the gas chamber for low and medium range, then into the SA-9 gas chamber for the high range noble gas measurement and finally, to the sample outlet. The plumbing is configured so that the SA-13 and SA-9 can be flushed from a separate inlet by way of motor actuated valves. There are also two separate grab sample ports for access to the sample influent.
- b. Each SPING-4 subsystem interfaces 9 channels of measurements into its Microcomputer Controlled Radiation Monitoring System.
The 9 channels serve as follows:
(1) Channel 1, Beta Particulate Detector (2) Channel 2, Alpha Particulate Detector for background detection and subtraction from CH-1 (3) Channel 3, Iodine-131 Detector (4) Channel 4, Energy above Iodine-131 for background detection and subtraction from CH-3 (5) Channel 5, Noble gas, low range (beta gas) detector )
(6) Channel 6, Area Gamma Detector (7) Channel 7, Noble gas, mid range (gamma gas) detector (8) Channel 8, Gamma Background Detector (9) Channel 9, Noble gas, high range (gamma gas) detector
- c. SPING-4 Monitors (1) Alpha and Beta Particulate Monitors The particulate filter is monitored by a beta scintillation detector from one side (Eberline Model RDA-3A and a solid state alpha detector on the other side (Eberline Model RDS-1). Counts from the beta detectors provide the measure of the beta-emitting isotopes on the filter. The alpha detector measures the radon levels in the sample to provide a measure of the
., GRAND GULF NUCLEAR STATION -
CHEMISTRY INSTRUCTION i
Titla Tcntilction Exhtuat Graeous No.: 08-S-04-220 Ravision: O Pag 3: 5
. . Monitoring Systems' Operation t .
(~5 a
l contribution of these daughter products to the Beta i l particulate levels. This contribution is corrected by subtracting a factored amount of the alpha measurement from the beta measurement. This technique tends to nullify the effects of fluctuating radon / thoron levels on the particulate measurement. The RDA-3A Beta Scintillation Detector is interfaced via the 18-2 interface and the RDS-1 alpha detector is interfaced via the 18-3C interface.
(2) Iodine Monitor The charcoal cartridge is monitored by a 2 x 2 inch NaI (T1) gamma detector. This detector (Eberline Model RDA-2A) is gain stabilized to minimize the effects of drift caused by fluctuations in temperature and/or aging. The measurement is accomplished using a single channel analyzer (SCA) with its window calibrated to the 364 kev energy of I-131. An additional SCA is provided with its window calibrated to an energy above I-131 energy (400-450 kev) to provide a measure of the background in the iodine window. The effects of a fluctuating background can be nullified in the iodine
/_' measurement by measuring and subtracting the background.
- The RDA-2A is interfaced via the 18-2 Interface box.
(3)' Low Range Noble Gas Monitor (same as Beta Particulate Monitor)
The gas chamber is monitored by a Beta detector (Eberline Model RDA-3A). Background correction for this channel is derived from the gamma background detector, an energy compensated GM detector (Eberline Model 10450-828).
Since the external (ambient) gamma radiation has a measureable effect on the Beta measurements (particulate and gas), the gamma background channel is used as a source of subtraction for both the gas measurement and the particulate measurement. The RDA-3A is interfaced via the 18-2 Interface.
(4) Medium Range Noble Gas Monitor An energy compensated GM detector monitors the gas volume for the medium range noble gas measurement, with its output proportional to the gamma content of the sample.
An additional identical detector is provided in the w'
GRAND GULF NUCLEAR STATION ,
CHEMISTRY INSTRUCTION.
Nn.: 08-5-04-220 devisions 6 Title Vantilation Exhrust Gareous O Pages .
Monitoring Systema' Oparation I I
sampler shield as a measure of the external backg'round at .)
the sampler. The effects of 's fluctuating external background on the medium range gas channels are nullified by measuring and subtracting 'the beckground.
s The GM, detector is interfaced via the 1B-4 interface. -
(5) High Range Noble Gas Monitor . ,
An energy compensate'd GM detector monitors the gas volume for the high range noble gas measurement. .Its output is proportional to the gamma content of the sample. A check source is supplied for an electronics check. The GM detector is interfaced via the 18-4 interface.
3.3.2 AXM-1 The AXM-1 comprises fuur (4) major assemblies as follows:
- a. The Data Aquisition Module (DAM-4-6), which contains the ,
microcomputer, lu,the heart of the AXM-1 system. The software programs which control the systen are stored in Read Only Memory (ROM) and therefore, are fixed. Only the parameters of the system may be varied. The DAM-4-6 program for the AXM-1 recognizes five (5) active channels. They are:
(1) Channel 1 - (SA-16) p, articulate and iodine filter gamma activity at the Grab Sample ~ Pallet (GSP-1); processed via the IB-4A-HT-CC interface (2) Channel 2 - (SA-15) ~ Noble Gas Channel Background Subtraction; processed via the IB-4A-HT-CC Interface (3) Channel 3 - (SA-15) High Range Noble Gas at the Noble Gas Pallet (NGP-1); processed. via the IB-4A-HT-CC Interface (4) Channel 4 - (SA-14) Intermediate Range Noble Gas at the NGP-1; processed via the IB-48-HT-CC Interface (5) Channel 10 - Sample Flow Rete (Analog)
- b. The Grab Sample Pallet (GSP-1)-assembly comprises a panel '
mounted on a base with hand and motor actuated ball valves, an air flow meter, a compound vacuum pressure gauge, a metering '
valve, a terminal box, an IB-4A-HT-CC interface box,- and the-shielded SA-16 iodine and particulate sample assembly whichs
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4
-s
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. GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titla Ycntiittion Exhaust Ga:cous No.: 08-5-04-220 Rsvisicn O Pcg2 7 Monitoring Systems' Operat' ion
{~% .
can be removed and transported intact to the laboratory for
~
h analysis. The GSP-1 contains all necessary elements to perform the following functions:
(1) Collect particulate and iodine samples at a rate of 1/60 of the normal sampler flow rate. -
(2) Obtain gaseous grab samples.
(3) Purge the assembly of radioactive gases.
(4) Remove safely the collected particulate and iodine samples to a laboratory for analysis,
- c. The Bulk Filter Assembly (BFA-1), located inline prior to the mid-range and high range noble gas monitors, contains 2 charcoal cartridges and 1 particulate filter which filters the sample stream, assuring a gaseous only sample enters the SA-14 and SA-15 detectors' chambers.
- d. The Ncble Gas Pallet (NGP-1) is comprised of two (2) noble gas sampler assemblies (SA-14 and SA-15), a junction box, two (2)
IB AA-HT-CC interface boxes, one (1) IB-48-HT-CC interface box, a CSM-2 check source mechanism, a 1 to 10 L/M flow meter, a compound vacuum-pressure gauge, and a differential pressure switch which measures any pressure drop across the flow meter and provides a signal should the pressure drop, or the sample
~
flow stop.
3.3.3 Background Considerations for the SPING-4 and the AXM-1
- a. Each detector in the system is optimized to respond to the type of radiation it is intended to measure. However, a l detector typically is not totally non-responsive to other types of radiation. Also, a detector cannot tell the difference between radiation from the source it is intended to measure or from some interfering source. For instance, the beta scintillation dstector viewing the particulate filter will respond to all radioactivity whether it originates from fission products, radon daughters, noble gas or ambient gamma
- rays penetrating the lead shield. Therefore, a positive reading on a given detector may be an increase in the radiation of interest, or it may be an increase in some interferlng radiation.
r
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION . ,
Titls: Vtntilstion Exhaust Gaseous No.: 08-5-04-220 Revision: 0 'Pggas 8 Monitoring Syntems' Cperation >
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- b. Beta Particulate Channel >
.)
(1) Redon Daughters These are retained on the filter paper in the same manner as other particulates. The decay of the radon daughter.
includes emission of both beta and alpha particles.
Therefore, the count rate from the alpha particulate detector is a good measurement of the intensity of the redon daughters. This assumes there are no alpha emitting isotopes other than radon in the sampled air stream.
'(2) Noble Gas Any noble gas present in the free air space around this detector will contribute to its response. This response will be identical to the beta gas channel except in magnitude since the free space is sr. aller than the beta gas chamber volumei- Therefore, the beta gas channel -
could be used as a subtraction source to reduce the effect of noble gas on the beta particulata detector.
Data taken with Kr-85 indicates ~ the particulate channel's count rate (due to noble gas) is about 40% of the beta gas channel's count rate. -}
(3) Ambient Gamma A small portial of any gamma radiatimi present will penetrate the, lead shielding and cause the detector to respond. The amount of this response ~ depends on the direction and energy spectrum of the gamma radiation.
Two possibilities exist for measurement and subsequent subtraction of the. gamma background. One is the gamma area monitor and the other is the imbedded G-M tube (gamma background detector). Studies of trends is the best way to determine which f either.) would be the best subtraction source.
(4) Iodines Under some conditions, icdine isotopes can be retained on the particulate filter and contribute to the detector's response. This effect is dependent on the chemical form of the iodine as well as the temperature, humidity and other r arameters. Since it is highly variable, it cannot be measured and subtracted, but the user should be aware -
it exists.
)
t- _ __m_ _ _ _ . _ _ _ _ - _ _ _ _ _ _ _ _ . _ _ _ . _ _ _ _ . _ _ _ . _ _ _ _ _ . - _ _ _ _ _ _ _ . _ _ _ _ _ _ - . _ - . _ _ _ _ - _ . . _ _ _ _ _ _ _ _ _ _ _ _ _ . _
. GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Tit 19: Ventilction Exhxuct Gareoua No.: 08-S-04-220 lRavicion: O Prge: 9
. Monitoring. Systems' Operation
() c. Iodine Channel -
(1) Noble Gas Noble gas present in the free air space as well as any l
" held-up" in the filter cartridge can contribute to the l detector response. The normal set-up has the adjacent energy window (i.e., 400-450 kev) subtracting from the I-131 window (i.e. , 339-389 kev). Therefore the isotopic mix of the noble gases and the resultant gamma yields and energies determine what the ratio of responses in the two channels would be.
(2) Ambient Gamma ,
(a) Any gamma which penetrates the lead shield and reacts in the crystal will cause a response if its detected energy spectrum falls within one of the energy windows. The ratio of the response of the two channels depends on both direction and energy spectrum of the gamma, but in practice remains relatively constant.
(b) Since the detector cannot differentiate between g gamma radiation (of the same energy) from noble gas versus ambient, the selection of a subtraction factor may be somewhat of a compromise.
- d. Noble Gas Channels The only intefering radiation in the noble gas channels would be ambient gamma penetrating the lead shields. The same logic as in paragraph 3.3.3b.(3) above applies.
3.4 Detector Ranges (uC1/cc at approximately 60 L/M), Excluding the AXM-1 Monitors 3.4.1 GE detectors 10 to 1.0E6 CPM 3.4.2 SPING-4 detectors (uCi/cc at approxmately 60 L/M)
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- - - - ' - - - - - - - - - - - - - - - -- = = -- - -- --- - - --
r GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION - ,
Iltlos Vcntilction Exhaust Grieoua No.: 08-5-04-220 .Rsvicion: 0 Paga 10 Monitoring Systems' Operation -
- a. CH-1, beta particulate ---- 6.3E-12 to 2.4E-6 9
- c. CH-3, Iodine-131 --- 1.4E-11 to 3.82E-6
- d. CH 4, Energy above I-131 is the same detector as CH-3 and not an additional detector. Values from CH-4 are used for background subtraction for CH-3.
- g. CH-7, High Range Noble Gas (1) Xe-133, 1.0E-1 to 1.4E5
)
(2) Kr-85, 3.7E-1 to 5.2E5 3.4.3 AXM-1, NGP-1 Detectors [ gamma-bequerel MeV/cc ( 8q.MeV/cc)]
- a. CH-3, High Range Noble Gas --- 4.14E2 to 4.14E7
- b. CH-4, Intermediate Range Noble Ges --- 2.29E-1 to 2.29E4 3.4.4 AXM-1, GSP-1 The range is the same as for the CH-3, NCP-1 High Range Noble Gas monitor.
3.5 Accident Condition For purposes of an effluent release rate greater than the instantaneous release rate allowed by the GGNS Technical Specifications or an effluent release rate high enough to cause the normal range (low range) instrumentation to go off scale high.
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titica Vtntilttion Exhruat Gz::aus No.: 08-S-04-220 lRLvision: 0 lPegas 11 Monitoring Systems' Operation !
(~s i 4.0 PREREQUISITES "
4.1 Check I&C calibration stickers to affirm that I&C calibration due dates l
have not been exceeded.
4.2 Inform Operations Shift Supervisor prior to operating the sample panel or valves.
4.3 Apparatus Required 4.3.1 Filter holder assemblies 4.3.2 Charcoal filters l
4.3.3 Particulate filters 4.3.4 Marinelli beakers f 4.3.5 Tygon (or equivalent) tubing
}
l 4.4 Reagents Required None 4.5 Attachments 4.5.1 Attachment I - Grsneral Electric Vent Release Radiation Monitoring Subsystem 4.5.2 Attachment II - Accident Range and SPING Gaseous Effluent Monitoring Block Diagram 5.0 PRECAUTIONS Be cognizant of high voltages associated with the monitoring systems and the radiological conditions that may be encountered while performing the functions cf this procedure.
6.0 INSTRUCTIONS I NOTE At any point in this instruction where a function is neither desired or required, the operator may proceed, or return to any step to achieve the desired objective. This instruction includes the following sections:
Non-Panel Grab Sample Points, 6.1 s
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION ,
Titlos Ventilttion Exhaunt Gar:aun No.: 08-S-04-220 RLvicion: O Page: 12 ,
Monitoring Systems' Operation
'i Gaseous Grab Samples, 6.1.1 Particulate and Iodine Grab Samples, 6.1.2 General Electric Sample Panel, 6.2 Gaseous Grab Samples (None), 6.2.1 Particulate and Iodine Grab Samples, 6.2.2 General Electric, 3034 and 3014 Vial Sampler, GaseoJs $8mpling, 6.3 SPING-4 Monitors Data Collection and Sampling, 6.4 Sample Count Data, 6.4.2 Background Count Data, 6.4.3 and 6.4.4 Grab Sampling, 6.4.5 AXM-1 Monitors Data Collection and Sampling, 6.5 Background Check, Non-Accident Condition, 6.5.1 Sample Data Collection, 6.5.2 Filter Change-Out, 6.5.3 Grab Sampling, 6.5.4 Accident Conditions, 6.6
])
NOTE This instruction assumes that an individual having the authority to grant permission to operate the valves and switches on the ventilation monitoring systems has granted permission for the chemist to proceed.
6.1 Non-Panel, Grab Sample Points NOTE This section applies to existing sampling points such as the sampling point located on the 136' elevation of the Radwaste Building, and to similar sample points which may be added in the future.
NOTE Noble gas, particulate and iodine grab sampling can be done simultaneously by attaching the Marinelli beaker, in series, to the filter holder assembly, preferably to the outlet (iodine filter portion) end of the assembly. The following steps, however, do not follow this approach.
GRAND CULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titlo V;ntilr_ tion Exhau;t G wsoua No.: 08-S-04-220 Ravision: O Page 13
. Monitoring Systems' Operation 6.1.1 Gaseous Grab Samples 9
- a. As applicable, record the following:
(1) Ventilation Exhaust Flow Rate (2) Activities from the ventilation exhaust noble gas monitors (SPING-4 CH-5 low range, CH-7 mid-range, CH-9 high range) as per Steps 6.4.1 and 6.4.2.a, b or c.
- b. Attach the sampling tubing and apparatus as follows:
(1) Marinelli beaker inlet tubing to the sample outlet (2) Marinelli beaker outlet tubing to the vacuum pump inlet (3) The vacuum pump outlet to the sample point inlet
- c. Open the Marinelli stopcocks and the sample inlet and outlet '
valves.
- d. Turn the vacuum pump ON.
- e. Allow the vacuum flow to stabilize, then record the time.
- f. Allow the sample to purge for five minutes.
- g. Note the time while simultaneously closing the sample outlet and inlet valves, then close the Marinelli stopcocks.
- h. Turn the vacuum pump Off.
- 1. Remove the sample and apparatus from the sampling ports.
J. Record the noted time (Step 6.1.1.g) and date,
- k. If necessary, notify Operations shift supervision that sampling has been completed.
6.1.2 Particulate and Iodine Grab Samples
- a. As applicable, record the following:
b I
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION ,
Title Vantilttion Exhaust Garcous No.: 08-5-04-220 Ravision O Paga: 14
- Monitoring Systems' Operation .
(1) Ventilation Exhauct Flow Rate 9 (2) Activities from the particulate and iodine monitors (SPING-4 CH-1 Beta Particulate, CH-2-Alpha Particulate, CH-3 Iodine-131, CH-4-Energy above Iodine-131) as per Steps 6.4.1 and 6.4.2.a, b or c.
- b. Install the filter holder assembly with the particulate filter end of the assembly serving as the inlet into the assembly.
- c. Do Steps 6.1.1.c through 6.1.1.f, as applicable.
- d. Note the time while closing the sample inlet and outlet valves.
- e. Do Steps 6.1.1.h through 6.1.1.k, as applicable.
6.2 General Electric Sample Panel SD17 6.2.1 Gaseous Samples Since ventilation exhaust gaseous samples may also be obtained at the GE panels, obtain gaseous samples acccrding to Sections 6.1, 6.3, 6.4, 6.5 or 6.6, as. applicable. At GE panels,. sample from effluent side cf particulate sampler using same procedure listed in 6.2.2.a thru 6.2.2.d plus into from 6.1.1. -)
6.2.2 Particulate and Iodine Grab Samples
- a. Record sample flow start date and time.
- b. Record the value in line with the top edge of the top bevel on the FI-1 float.
- c. Close Valve V-3, then close Valve V-2.
- d. Record the date and time that sample flow was stopped.
- e. Observe and record the value indicated on FI-1.
- f. Determine sample flow as follows:
Step 6.2.2.b value - Step 6.2.2.e = particulate / iodine sample flow
- g. Remove the installed filter holder assembly from the quick disconnects.
)
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titls: Vcntilction Exhaust Gareoua No.: 08-S-04-220 Rnvision: 0 :Pcgo: 15 Monitoring Systems' Operation l m
- h. Install another filter holder assembly containing new filters, -)
with the particulate filter end of the assembly attached at i Valve V2 (system outlet / assembly inlet) and the iodine end of
) the assembly at Valve V3. Cartridge should have direction of I
flow marked on the cartridge.
NOTE If the assembly is reversed, particulate will be collected on I the iodine cartridge and the particulate filter will be torn by the sample flow.
- 1. At the SD17 panel, record the ventilation flow rate, date and time.
J. Observe that the FI-1 value has not changed since Step 6.2.2.e.
- k. Open Valve V2.
- 1. Using the ventilation flow rate taken from the SD17 panel and l the Ventilation Flow vs Total Sample Flow isokinetic chart for the applicable system, throttle open Valve V3 and adjust the sample flow indicated on FI-1 to the required isokinetic flow. I
- m. Record the date, time and the FI-1 value.
- n. Subtract the FI-1 value of Step 6.2.2.e or j from the FI-1 value of Step 6.2.2.1 to obtain the sample flow rate.
- o. If necessary, and if no further functions are to be performed, notify Operations shift supervision that normal operating flows have been re-established, with all valves set to their normal operating alignment,
- p. Verify that the appropriate hi/lo flow alarms ~ have been cleared.
6.3 General Electric, 3034 and 3014 Vial Sampler, Gaseous Sampling NOTE Before a system can be sampled, valve lineup must be established for that system according to the following tables:
L
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION -
Titlos Ventilction Exhrunt G:ccous No.: 08-5-04-220 Rovision: O Pug'3: 16 Monitoring Systems' Operation .
s 1D17-3-34 Panel Valve Lineup .)
VALVE 1D17-SAMPLE F003G F003H F003] F003K F-005 Monitor Only 0 C C C C .
Recombiner Outlet
- O C C 0 0 SJAE A 0 C 0 C 0 SJAE B 0 0 C C 0 1D17-3014 Panel Valve Lineup VALVE 1D17-SAMPLE F003D F003C F003L F003M F003E F003F F009 Monitor Only 0 0 C C C C C Charcoal Beds Combined Effluent
- 0 0 C 0 C C 0 Charcoal Beds Inlet 0 0 C 0 C C 0 Bed D012A Outlet 0 0 C C 0 C 0 Bed D012B Outlet 0 0 C C C 0 0
- Normal Sample and Monitoring Point 0 - Valve Open C - Valve Closed Position the sample container (vial) onto the needle in the sample 3>
6.3.1 vial positioner (see Attachment I).
6.3.2 Affirm that the vial is properly seated and that the micro-switch 53 on the sample box is closed.
6.3.3 Turn power switch S2 to ON.
6.3.4 Turn functional switch, S1 to PUMP DN, EVACUATE VIAL position.
6.3.5 Observe that the green indicator lamps for the SV2 (DS2) Valve, the SV3 (DS3) valve and the SV4 (DSA) vacuum pump are illuminated.
NOTE When the green indicator lamp for the Solenoid Valves SV1 (DS1),
SV2 (DS2), or SV3 (DS3) are illuminated, it indicates that the particular valve is energized and open. When the green lamp for SV4 (DS4) vacuum pump is illuminated, it indicates that the vacuum pump motor has been energized.
, GRAND GULF NUCLEAR STATION . CHEMISTRY INSTRUCTION Titlos Vtntily. tion Exhrust Gm eous No.: 08-5-04-220 lRavision O Pc:ga: 17 Monitoring Systems' Operation l l i
NOTE When step 6.3.1d. is executed, SV2 and SV3 were energized and the K1 relay contacts were closed, providing power to energize the vacuum pump, provided the sample vial wae properly installed.
6.3.6 Check the vacuum gauge and allow the evacuation of the sample vial to the desired level (0 to 30" Hg).
6.3.7 Move the functional switch S1 to the CHECK VACUUM AND PURGE SAMPLE LINE position.
l 6.3.8 Observe that the SV2 and SV4 green indicator lamps are illuminated and that the SV3 lamp is extinguished. .
NOTE Step 6.3.1g. allows confirmation by checking the vacuum gauge, l that the seal between the sample vial and the sampler is adequate.
6.3.9 Check the vacuum gauge to affirm that the vacuum on the sample
(. vial is maintained.
6.3.10 Move the function switch to PURGE position, and purge for the required time.
6.3.11 Move the function switch S1 to FILL VIAL position.
NOTE l
The vacuum pump is de-energized, SV2 closes, SV1 remains open, SV3 opens to allow a gaseous sample to back fill into the sample vial.
6.3.12 Observe that the SV2 and SV4 lamps are extinguished and that the SV1 (DS1) and SV3 (OS3) lamps are illuminated.
6.3.13 After the vacuum pump gauge is stabilized, move the function switch S1 to REMOVE VIAL position.
NOTE All the SV's are de-energized.
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GRkND GULF NUCLEAR STATION CHEMISTRY INSTRUCTI0tl -
Tit 19: Vcntilition Exhrust G :cous No.: 08-5-04-220 R&vicion: 0 lPage 18 Monitoring Systems' Operation (
6.3.14 Observe that all green indicator lamps are extinguished.
6.3.15 Remove the sample container vial .from the sample vial positioner and place the container in a plastic bag and sample transporter.
CAUTION To prevent loss of sample, Step 6.3.1.q should never precede Step 6.3.1.o.
6.3.16 Position the power switch S2 to 0F.
6.3.17 Move functional switch S1 to its INSERT VIAL position.
6.3.18 Assure that valve lineup is restored to its original arrangement.
6.3.19 Notify Operations shift supervision that sampling has been completed.
6.4 SPING-4 Monitors (SA-9 and SA-13) Data Collection and Sampling 6.4.1 As applicable, remove or shield any radioactive sources which may contribute activity to the detectors.
3-NOTE If filter change out is desired, proceed to Step 6.4.3, 6.4.4 or 6.4.5, as applicable, or if flushing and background data collec-tion is required prior to obtaining sample count data, do Steps 6.4.4 a then return to Step 6.4.2.
6.4.2 To obtain count data from the ventilation exhaunt, select one of the following steps (a, b, c or d):
- a. From the SPING-4 Console, obtain the last printout of data, with date, time, vent flow and sample flow collected by the monitoring system in the normal operating mode, or
- b. Obtain the count values from the most recent data collected by c the monitoring system in the normal operating mode by rotating the thumbwheel Channel Selector Switch to the desired channels and recording the values, including date, time, ventilation flow rate and sample flow rate, using the thumbwheel switch to select the desired channels as follows:
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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titlos Ventilation Exhru;t Gaa;oua No.: Od-S-04-220 lRsvision: 0 lPeger 19 Monitoring Systema' Oparrtion l
(,
(1) Channel 1, Beta Particulate -)
(2) Channel 2, Alpha Particulate (3) Channel 3, Iodine-131 (4) Channel 4, Energy above Iodine-131 (5) Channel 5, Noble Gas, low range (beta gas) 1 (6) Channel 6, Area Gamma l (7) Channel 7, Noble Gas, mid-range (gamma gas)
(8) Channel 8, Gamma Detector Background (9) Channel 9, Noble Gas, high range (gamma gas) l (10) Channel 10, Sample Flow Rate 1
(11) Channel 11, Ventilation Effluent Flow Rate
- c. If the data from Steps 6.4.1.a and/or b is unacceptable and/or l unavailable, obtain permission from the I &.C Department and I
select 6.4.2.c(1) or (2), and 6.4.2.c(3).
CAUTION .
The calibration switches should never be operated without permission from the I & C Department.
(1) To obtain present count data at the console, set the SPING-4 Maintenance Mode Calibration Switch and all Channel Switches to ON and allow a minimum of two printouts (10 minutes each) on the console for each channel, then obtain the printout, including ventilation flow rate, sample flow rate, date and time.
NOTE When the SPING-4 is in the Calibrate Mode for all channels, count data for all channels is printed out every 10 minutes on the console. To obtain data at the panel, the chemist must wait ten minues for the counting to be completed, then rotate the thumbwheel Channel Selector Switch to the desired channel number to obtain data for each channel.
- i. _
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION ,
Titlos Vrntilttion Exhaust G::cous No.: 08-5-04-220 Rsvision: G Payye: 20 -
Monitoring Systema' Op ration (2) To obtain present count data at the panel, set the Maintenance Mode Calibration Switch and all Channel 3]
Switches to ON; then, after the first ten-minute count period, rotate the thumbwheel Channel Selector Switch to the desired channel numbers as per Steps 6.4.2.b(1) through (11) and record the values, including date, time, ventilation flow rate and sample flow rate; then, when the second count period is completed, obtain and record those values.
(3) Set the Maintenance Calibrate Switch to 0FF for all channels,
- d. If necessary, notify Operations shift supervision when completed, and request that all alarms be cleared.
6.4.3 Background Check and Filter Change-out when radioactivity levels for all channels are at background
- a. Background Checks are satisfied by Steps 6.4.2.a, b or c.
- b. Filter Change-Out.
(1) Allow the monitoring system to remain in the sampling and analysis mode.
(2) Rotate the SPING-4 thumbwheel Channel Selector Switch to Channel 10, then retst and record the Sample Flow Rate.
(3) Rotate the thumbwheel switch to Channel 11, then read and record the Ventilation Exhaust Flow Rate.
(4) Rotate the thumbwheel switch to the following channels to read the count values for the particulate and iodine channels, if desired:
(a) Channel 1, Beta Particulate (b) Channel 3, Iodine-131 (c) Channel 4, Energy above I-131
, GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titlas Wntilttion Exhrust Ga=;ous No.: 08-S-04-220 RLvision 0 IPage 21
. Monitoring Syatema' Oparation t O' (5) Note the time, while using the filter assembly retracting k
-1 tool to carefully re'nove each assembly, holding each heavy assembly firmly to avoid dropping it.
(6) Transfer the used filters to adequately labeled containers.
(7) Place clean, new filters into each assembly, reinsert the assembly into the proper slot, and note the time.
(8) Record the dates and times noted in Steps 6.4.3.b(5) and (7). -
(9) If necessary, notify Operations shift supervision when completed, and request that all alarms be cleared.
6.4.4 Background Check and Filter Change-Out when radioactivity levels in any channel is above background
- a. Do Steps 6.4.3.b(2) and (3).
- b. If deemed necessary, press the FLUSH Switch, and record the time sample flow was stopped.
i NOTE When FLUSH is' initiated on the SPING-4, the sample (vacuum) pump for the SPING-4 system automatically shuts down, the purge valve V2 opens and the sampling valve V5 closes, taking the SPING-4 off-line and the AXM-2 (which is normally in the standby mode, with its sample inlet valve closed and its purge inlet valve open) is brought on-line as the AXM-1 purge inlet valve closes and the sample inlet valve opens.
- c. When sufficient time has elapsed, rotate the thumbwheel Channel Selector switch to all channels to determine if activity levels are decreasing.
i
- d. When the activity levels no longer indicate a decrease, pull i
out the particulate and lodine detector / filter holder assemblies, remove the used filters and place the filters in adequatley labeled containers.
- e. Place clean, new filters into each assembly, then reinsert the assembly into the proper slot.
v b -
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION ,
Tit 19: Vcntiittion Exhiuat G::eouc No.: 08-S-04-220 Revisinn O Prger 22 Monitoring Systems' Operation 1 -
- f. When sufficient time has elapsed, obtain background data, 9 if required, according to Step 6.4.2a, b or c.
- g. Press the FLUSH Switch to terminate the flush.
- h. Press the PUMP Switch to resume sampling and monitoring.
- 1. Record the time sampling and monitoring was resumed.
J. Do Steps 4.6.3.b(2) and (3).
- k. If necessary, notify Operations shift supervision when completed, and request that all alarms be cleared.
6.4.5 Grab Sampling (SPING-4)
NOTE Grab sampling is normally accomplished by utilizing the nor-panel grab sample points, Section 6.1. Grab sampling, using the SPING-4 panel may be used as desired, or as an alternative sampling method, when for any reason, normal sampling points cannot ba used.
- a. Gaseous Samples )
(1) If the SPING-4 is in the purge ' mode, press the pump ON switch and allow the system to circulate for approximately 5 minutes.
(2) Obtain and record the ventilation and sample flow rates.
(3) Attach the inlet and outlet tubes on the Marinelli beaker to the sample inlet and outlet valves at V3 and V4.
(4) Open the Marinelli beaker stopcocks.
(5) Open Valves V3 and V4 and close Valve V1.
(6) Record the time .ind date.
1 (7) Allow the flow to ctabilize, note the sample flow rute, and if different from Step 6.4.5a.(2), record the value.
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Tit 19:
Ventliction Exhaust G neous No.: 08-S-04-220 Rsvision: O Pcgs: 23 Monitoring Systems' Operation i m f
(8) At approximately 5 minutes after the flow rate J stabilizes, note the time, close both Marinelli beaker stopcocks, and quickly open Valve V1.
(9) Close Valves V3 and V4.
(10) Record the time and date the stopcocks were closed in -
i Step 6.4.5.a(8). l (11) Remove the sampling tubing from the sampling ports.
(12) If necessary, notify Operations shift supervision that sampling has been completed and request that all alarms )
be cleared.
- b. Particulate and Iodine Sampling (SPING-4)
(1) Do Steps 6.4.3.b(2) and (3). ,
(2) Attach the filter holder assembly as follows:
(a) Attach the assembly inlet (particulate filter end) to the left sample port (at V4) directly under the DISPLAY III A panel of the SPING-4 monitor. 1 f
(h) Attach the assembly outlet (iodine filter end) to the sample port (at V3) on the right.
(3) Assure Valve V1 is closed. 1 (4) Assure vacuum pump is ON.
(5) Slowly open Valves V3 and V4 and record the time.
(6) Observe the sample flow rate, and if different from the value in Step 6.4.5.b(1), record the value.
(7) When the desired sampling ti:ae is reached, open Valve VI, then close Valves V3 and V4 simultaneously. ,
(8) Record the date and the exact time that Valves V3 and V4 were closed.
(9) Remove the sampling apparatus.
U
GR NO GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Title VIntiletion Exhrust Gaseous No.: 08-5-04-220 Ravision: O Pcgs: 24 ,
Monitoring Systems' Operation (10) If necessary, notify Operations chift supervision that i sampling has been completed and request that all alarms be cleared.
6.5 AXM-1 Monitors Data Collection and Sampling NOTE The AXM-1 system reniaAns in the purge mode except when:
- 1. the SPING-4 is inopertaive,
- 2. high radiation levels at the SPING-4 Mid-range noble gas monitor have initiated the FLUSH command in the SPING-4, taking the SPING-4 subsystem 0FF-LINE, or when
- 3. The SPING-4 is in the FLUSH Mode for any reason.
NOTE Steps 6.5.1.a and b assumes the AXM-1 is in the purge mode, and that the particulate and iodine filters in the SA-16 (GSP-1) are free of radioactive contaminants.
6.5.1 Background Check, Non-Accident Condition ,
- a. Rotate the DAM-4 thumbwheel Channel Selector Switch to the desired channel numbers, read and record the values, as necessary, for the following channels:
(1) Channel 1, SA-16, Particulate and Iodine (GSP-1)
(2) Channel 2, SA-15, Noble gas Channel Background Subtraction (3) Channel 3, SA-15, High Range Noble Gas (NGP-1)
(4) Channel 4, SA-14, Mid-range Noble Gas (NGP-1)
(5) Channel 10, Sample (or purge) Flow Rate, as appicable (6) Channel 11, Ventilation Exhaust Flow Rate, as applicable
- b. Record the date and time, m applicable.
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, GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION l
Titlas Vinti1& tion Exhaust Greeous No.: 08-5-04-220 Ravision: O Pega 25 Monitoring Systems' Operation
! ('N I 6.5.2 Sample Data Collection i
- a. If, for any reason, the SPING-4 Subsystem is inoperative and the AXM-1 is operating, proceed to Step 6.5.2.d.
- b. Initiate the operation of the AXM-1 Subsystem by pressing the FLUSH Switch on the SPING-4.
- c. If the PUNP on the AXM-1 did not activate, prese the AXM-1 Pump switch, and assure that the pump is ON.
- d. After allowing sufficient itme (ten minues or more) for count i data collection, do Steps 6.5.1.a and b.
- e. Record the date, time, the Sample Flow Rate from Channel 10 and the Ventilation Exhaust Flow rate taken from Channel 11.
- f. If necessary, notify Operations shift supevision when completed, and request that all alarms be cleared.
6.5.3 Filter Change-Out
- NOTE t
Steps 6.5.3.a through h assumes that the AXM-1 is in the sampling and analysis mode. If the system is not on-line because of high radiation, filters can be changed out according to Step 6.5.3.f as desired, without using valves V3, V4 and V5.
1
- a. Rotate the DAM-4 thumbwheel Channel Selector Switch to CH-10, read and record tha $ ample Flow Rate, then rotate the switch to Channel 11, reac and record the Ventilation Exhaust Flow Rate.
- b. Open valve V3, close valves V4 and V5, then record the date and time the flow was stopped.
- c. Reverse the Channel Selector Switch to Channel 2, read and record the count value, as necessary, then repeat this step for Channel 1.
- d. If the radiation level in the SA-16 is low enough that the ,
assembly can be opened safely, preceed to Step 6.5.3.f
- e. If the radiation level in the SA-16 assembly is too high, or if contamination is possible should the assembly-be opened at the panel, disconnect the detectors, release the clamps holding the SA-16 assembly, remove the assembly and replace it with another prepared assembly, then proceed to Step 6.5.3.g.
a
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION -
Titlo: Vtntilation Exh ust Gcccous No.: 08-S-04-220 Rsvision: U Pag 3: 26 -
Monitoring Systems' Operation -
].
- f. Withdraw the detector / filter holder assembly from the SA-16, place the used filters in adequately labeled containers, replace the used particulate and iodine filters with new filters, then reinsert the assembly into the SA-16.
- g. If no other functions are to be performed, open Valves V4 and VS, then close Valve V3 and note the time.
- h. Record sample flow rate, ventilation flow rate, and the date and time noted in Step 6.5.3.g.
- 1. If necessary, notify Operations shift supervision when completed, and request that all alarms be cleared.
6.5.4 Grab Sampling (AXM-1, GSP-1)
- a. Gaseous Samples NOTE For gaseous grab sampling of this subsystem when the SPING-4 is inoperative or when high radiation levels have forced the SPING-4 subsystem offline, refer to Section 6.6.1.
(1) Using the DAM-4 DISPLAY III A channel select switch, J obtain and record the activities from the SA-14 (CH-4 mid-range NG) and SA-15 (CH-3 high range NG) monitors, if necessary.
(2) Record the date and time.
(3) Obtain and record the ventilation (CH-11) and sample flow rates (CH-10).
NOTE If the panel sample flow indicator is to be used in Step 6.5.4.a(9), do not open Valve V3 or close Valves V4 and V5 in the following step. If the SA-16 assembly will not be valved out, used filters in the assembly should be replaced with clean, new filters, as required.
)
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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titlo Vcntflation Exhrust Gaseous No.: 08-S-04-220 :Ravicion: O Pcg3: 27
. Monitoring Systems' Operation l
?
(4) Open Valve V3, assure Valve V6 is open, close Valves V5 ~
and V4, then affirm that the SPING-4 is purging to assure that GSP-1 is sampling.
(5) Attach the Marinelli beaker inlet and outlet tubes to the sampling parts at valves V7 and V8.
(6) Open the Marinelli beaker stopcocks, then open Valves V7 and V8.
(7) Close Valve V6.
(8) Record the date and time.
(9) Allow the flow to stabilize and if the SA-16 was not valved out, note the sample flow rate and if different from Step 6.5.4.a(3), record the value.
(10) At one to five minutes after flow rate stabilization, note the time, close the Marinelli stopcocks, and quickly-open Valve V6.
NOTE Activity levels determine sampling duration.
(11) Close Valves V7 and V8.
(12) If the SA-16 was valved out in Step 6.5.4.a(4), open Valves V4 and VS, then close Valve V3.
(12) Record the time the Marinelli stopcocks were closed in Step 6.5.4.a(10), then remove the sampling tubing from the sampling ports.
(14) If necessary, notify Operations shift supervision that sampling has been completed and request that all alarms as cleared,
NOTE Particulate and iodine grab sampling of this subsystem will be required only when the SPING-4 is inoperative or when high radiation levels at the SPING-4 Mid-range noble gas monitor have initiated the FLUSH command in the SPING-4, taking the SPING-4 off-line.
t i
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Titlos Vcntilation Exhault Grasous No.: 08-5-04-220 Ravision 0- Page: 28 -
Monitoring Systems' Operation ,
(1) Obtain and record the ventilation and sample flow rates. r)
(2) Open valve V3, then close Valves V4 and V5.
(3) Install the filter holder assembly with the particulate end of the apparatus toward Valve V8 and the lodine end toward Valve V7.
(4) Open Valve V8, then V7.
(5) Close Valve V6.
(6) Record the date and time.
(7) Based on sample activity, allow sufficient time for collecting a representative sample.
(8) Open Valve V6, close Valve V8, then close Valve V7.
(9) Record the time and date sample flow through the filter assembly was stopped.
(10) Disconnect the filter holder assembly lines from the sampling ports.
(11) Open Valves V4 and V5, then close Valve V3. )
(12) As necessary, notify Operations shift supervision when sampling is completd, and request that all alarms be cleared.
- 3. Install the filter holder assembly with the particulate filter end of the assembly serving as the inlet into the assembly.
- b. Open the sample outlet and inlet valves.
6.6 Accident Conditions NOTE The normal condition of the Ventilation Exhaust Gaseous Systems in an accident condition is to have the Standby Gas Treatment System operating and all other release points isolated. Each release point has an accident range monitor and is capable of accurately measuring accident releases, however; only the Standby Gas Treatment (SGT) monitors will be
)
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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION
, Titla #cntilEtion Exhiust Ga;cous No.: 08-5-04-220 Rsvicion O Pega 29 Monitoring Syatema' Opsrction (5
needed in an accident condition. If releases occur from other release i points during an accident, the following sections may be used to ensure proper monitoring and sampling.
6.6.1 Gaseous Sampling Section 6.5.4 [AXM-1 (GSP-1) Subsystem] should be used for sampling with the 1 liter or 4 liter marinelli beaker. If the expected concentrations are too high for counting in a marinelli, the following procedure may be used:
- a. Substitute a piece of tygon tubing for the marinelli beaker and attach to the inlet and outlet tubes on the AXM-1.
- b. Establish flow through the tygon tube per Step 6.5.4.a(1) through 6.5.4.a(9).
- c. Evacuate a 14 ml off-gas vial.
- d. Use a Hamilton gas syringe or equivalent to draw a gas sample from the tygon tube and note the time.
NOTE Volume of gas may vary from approximately 1 m1 to 10 ml depending on tne expected concentration of the gas.
I
- e. Transfer the gas to the evacuated off-gas vial.
- f. Record the time noted in Step 6.6.1.d, and secure from gaseous sampling as per 6.5.4.a(10) through (14), as applicable.
6.6.2 Particulate / Iodine Monitors
- a. Install silica gel or silver zeolite cartridges in the SGT monitors.
NOTE The silica gel or silver zeolite cartridges are used to minimize the adsorption of noble gases on the cartridge that may interfere with the detection of I-131.
- b. Install silica gel or silver zeolite cartridges in other release point monitors as deemed necessary.
(_,
GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION Titlos Vantilttian Exhaunt Garcous No.: 08-S-04-220 Rsvision: O Prge 30 Monitoring Systems' Operation 1 -
s 6.6.3 Particulate / Iodine Sampling -1 Section 6.5.3 (AXM-1, GSP-1 Sample Panel) should be used for sampling during accident conditions.
NOTE Silica gel or silver zeolite cartridges may be used to minimize interference from noble gas nuclides.
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' GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION 08-S-04-220 Rev. O Attachment I Page 1 of I cS
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08-S-04-220 Rev. 0
, ,g Attachment II Page 1 of 1 1\ -
ACCIDENT RANGE AND SPING GASEOUS EFFLUENT MONITORING BLOCK DIAGRAM 1 E
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