ML061000476

Monitoring of the Radioactive Gaseous Waste Management System Procedure Number 35430-C Rev 24

ML061000476
Person / Time
Site:	Vogtle
Issue date:	02/23/2004
From:	Carter B Southern Nuclear Operating Co
To:	Office of Nuclear Reactor Regulation
References
35430-C, Rev 24
Download: ML061000476 (15)

Text

Approved By Procedure Number Rev B. D. Carter Vogtle Electric Generating Plant 35430-C 24 Date Approved M1ONITORING OF TIHE RADIOACTrIE GASEOUS WASTE NIANAGENIENT Page Number 02/23/2004 SYSTEMI 1 of 15 MONITORING OF TlHE RADIOACTIVE 4 GASEOUS WASTE MANAGEMENT SYSTEM 1 li PROCEDURE USAGE REQUIREMENTS- SECTIONS Continuous Use: Procedure must be open and readily available at the work NONE location. Follow procedure step by step unless otherwise directed.

11 Reference Use: Procedure or applicable section(s) available at the work ALL I location for ready reference by person performing steps. ATTACHMENTS I

Information Use: Available on plant site for reference as needed. ALL SECTIONS i

I i

Printed March 16, 2006 at 10:29

Approved By _ ., . . Procedure Number Rev B. D. Cartel Vogtle Electric Generating Plant - 35430-c 24 Date Approved MONITORING OF TIIE RADIOACTIVE GASEOUS WASTE MANAGEMENT Page Number W 02/23/2004 SYSTEM 2 of 15 INFORMATION USEl 1.0 PURPOSE This procedure provides instructions for monitoring the Gaseous Waste Management System in accordance with the Technical Requirements Manual.

2.0 DEFINITIONS 2.1 Xe-133 equivalence - Equivalent activity derived by multiplying the activity of the nuclide of interest by its dose factor.

2.2 Dose factor - factor assigned to each nuclide of interest that is a ratio of the dose derived from an equivalent amount of Xe-I 33.

3.0 PRECAUTIONS 3.1 Follow appropriate Radiological Control practices when handling radioactive samples.

3.2 Transfer of samples to a counting vial should be done in the laboratory hood.

3.3 The Technical Requirements Manual for the Gaseous Waste Processing System requires that:

3.3.1 The concentration of oxygen in the Gaseous Waste Processing System shall be limited to less than or equal to 2% by volume whenever the hydrogen concentration exceeds 4% by volume.

3.3.2 With the concentration of oxygen in the Gaseous Waste Processing System greater than 2% by volume but less than or equal to 4% by volume, reduce the oxygen concentration to the above limits within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

3.3.3 With the concentration of oxygen in the Gaseous Waste Processing System greater than 4% by volume and the hydrogen concentration greater than 4% by volume, immediately suspend oxygen additions and all additions of waste gases to the system and reduce the concentration of oxygen to less than or equal to 4% by volume, then reduce the oxygen concentration to less than or equal to 2% by volume within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

3.4 The Technical Requirements Manual for the Gaseous Waste Processing System requires that:

3.4.1 The quantity of radioactivity contained in each gas decay tank shall be limited to les than or equal to 2.0 E+5 Curies of noble gases (as Xe-133 equivalent).

Printed March 16, 2D06 at 10:29

IApproved

__ D By Date Approved Vogtle Electric Generating Plant , t MONITORING OF TIHE RADIOACTIVE GASEOUS WASTE rItANAGEMI ENT Procedure Number Page Numter Rev 02/23/2004 SYSTEM 3 of 15 3.4.2 With the quantity of radioactive material in any gas decay tank exceeding the above limit, immediately suspend all additions of radioactive materials to the tank and within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> reduce the tank contents to within the limit. Submit required reports, refer to applicable Chemistry procedures.

3.5 Table I of this procedure contains ODCM table 3-1 and Technical Requirement Manual section 13.12.1 with required aztions.

3.6 Hydrogen is a colorless, odorless gas that burns with a non-luminous flame, which can be invisible under bright light. At atmospheric conditions, hydrogen gas is combustible ranging from 4% to 74% by volume. H-lvdrogen has a lower explosive limit of 13% in air at atmospheric pressure.

3.7 Before breaching a hydrogen related system, the system should be purged and atmospheric concentrations verified below the LEL. Also, when working on a hydrogen related system, use non-sparking tools when the possibility of exceeding LEL exists.

4.0 PROCEDURE 4.1 SYSTEM DESCRIPTION 4.1.1 The Gaseous Waste Processing System (GWPS) is designed to collect, process, and store gaseous wastes generated by plant operations. The system is designed to assure that the release of gaseous effluents from the plant and expected offsite doses are as low as reasonably achievable (ALAR.A) as defined in Appendix I of I OCFR50.

4.1.2 The GWPS is controlled from the waste processing panel. The GWPS consists mainly of two closed loops comprised of a waste, gas compressor, a catalytic hydrogen recombiner and seven waste gas decay tanks (GDTS) to accumulate the fission product gases.

4.1.3 Two waste gas compressor packages are provided to circulate gases around each GWPS system loop. One is normally in use and the other on a standby basis.

4.1.4 Three catalytic hydrogen recombiners are provided for the two units. One recombiner per unit is used in each main process loop to remove hydrogen from the hydrogen-nitrogen fission gas mixtures by oxidation to water vapor. The units are self-contained and are designed for continuous operation.

4.1.5 The Waste Gas Decav tanks are of the vertical cylindrical type constructed of carbon steel. There are a total of 16 waste decay tanks. Seven are used by each unit during normal operation; the remaining two are shared between the two units and arc used for shutdown and startup.

Printed March 16, 2006 at 10:29

Approved By 7 Procedure Numbner Rev B. D. Carter ogtle Electric Generating Plant A& 35430-C 24 Date Approved MONITORING OF TiE RADIOACTI'E GASEOUS WASTE NIANAGEM ENT Page Nun')cr 02/23/2004 __SYSTEM 4 of 15 4.1.6 The oxygen concentration of the Waste Gas System is monitored and controlled to ensure that a flammable hydrogen-oxygen mixture does not occur. The GWPS is provided with two analyzers to monitor oxygen concentrations. One is between the oxygen supply and the hydrogen recombiner package, and one is downstream of the hydrogen recolribiner.

When the hydrogen concentration is above the lower flammability limit of 4 percent, the minimum conc-ntration of oxygen necessary for deflagration is 5 percent. The control function assigned to these analyz7ers is to automartically tciminate the oxygen supply before reaching GVPS oxygen concentrations favorable for hydrogen flammability.

Each hydrogen recombiner package als: includes two hydrogen analyzers. One monitors the process stream entering the hydrogen recombiner, and one monitors the discharge stream.

4.1.7 During normal powver operation, nitrogen gas with entrained fission gases is continuously circulated around each G\WPS process loop by one of the two waste gas compressors in the loop. Fresh hydrogen gas is charged to the VCT, where it is mixed with fission gases which have migrated from the reactor coolant into the vcr gis space. The contaminated hydrogen gas is continuously vented from the VCT into the circulating nitrogen stream to transport the fission gases into the GWPS. The resulting mixture of nitrogen-hydrogen fission gas is pumped by the waste gas compressor to the hydrogen recombiner, where enough oxygen is added to reduce the hydrogen to a low residual concentration by oxidation to water vapor on a catalytic surface. After the water vapor is removed, the resulting gas stream is circulated to a normal operation GDT and back to the waste gas compressor suction to complete the circuit. Refer to Figure 1 for a schematic of the i Gaseous Radioactive Waste System.

4.1.8 Each normal operation GDT is capable of being isolated, and only one tank is valved into operation in each process loop at any time. This minimizes the amount of radioactive gases that could be released as a consequence of any single failure, such as the rupture of any single tank or connected piping. By alternating the use of these tank:., the accumulated activity from one unit is distiibuted among all seven normal operation 3DTs in the process loop.

4.1.9 Radiation detector RE-00 13 is located adjacent to the pipe in the recirculation loop of the inservice Waste Gas Decay Tank. This monitor has been calibrated to allow the determination of the inservice 'Waste Gas Decay Tank radioactivity inventory.

Printed March 16,2306 at 10:29

Approved By ,Ti ting Procedure Number Rev B. D. Carter Vogtle Electric Generating Plant A35430-C 24 Date Approved IMONITORING OF THE RADIOACTIVE GASEOUS WASTE NIANAGENI ENT Page Numnbcr 02/23/2004 S YSTE NI 5 of 15 4.1.10 With continued plant operation, pressure in the nonrnal operation will gradually increase as non-rernovable gases accumulate in the system. The initial system equipment lineup will be from the waste gas compressor to the hydrogen reconibiner and then to the normal operation GDT. As the nonnal operation GDT pressure builds up, compensation must be made by periodic adjustment of the hydrogen recombiner backpressure control valve.

When the nornal operation GDT pressure reaches approximately 20 psig, the backpressure control 'valve will be filly open, so that no mor'Je adjustment can be made.

At this time, the appropriate bypass lines are opened to line up the equipment for flow from the waste gas compressor to the normal operation GDTs and then to the hydrogen recombiner. The hydrogen recombiner backpressure control valve is reset as required for the new arrangement, and the normal operation GD'T pressure indicators are switched by Operation Department to read high range. This arrangement is suitable for operation up to 100 psig.

4.1.11 Degassing operations are different than normal operations of the WGPS.

During nonnal operation, the fission gasses that escape from the RCS into the VCT vapor space are started on the removal process by adding hydrogen to the VCT vapor space then by using nitrogen, basically as a carrier gas. The mixture of hydrogen and fission gasses are routed through the waste gas compressor and the catalytic recombiners.

Degassing operations differ from normal operations in that a system or component has unwanted gasses removed by a procedure not ordinarily used in routine operation.

Examples would be the degassing of the recycle hold up tank; degassing the RCS in preparation for removing the pressure vessel top; degassing the reactor coolant drain tank; or other operations controlled degassing procedures.

When actions refer to degassing, thcre are the types of operations referred to. The type of operation: (i.e. degarsing or routine operation) determines the sampling frequency if an active LCO is in place against WGiPS. The Shift Supervisor will determine the type of operation that we are under (degassing or routine operation) and Chemistry will schedule the sampling frequency to satisfy the LCO action statement accordingly.

Printed March 16,2006 at 10:29

Approved By 4t, . Procedure Number Rev B. D. Carter V'logtle Electric uGenet3t5ng Pl ant 3530-C 24 Date Approved MONITORING OF THE RADIOACTIVE GASEOUS WASTE IANAGE~NIENT Page Nurnmcr 02/23/2004 SYSTE.NM 6 of 15 4.2 FREQUENCY OF RADIOACTIVITY INVENTORY DETERMINATION 4.2.1 The determination of the radioactivity inventory of tanks in the GWPS will be made at the frequency prescribed in Procedure 30025-C, "Periodic Analysis Scheduling Program".

4.2.2 Each tank that has been in scrvice during the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and is not presently in service, needs to hr1-'e its irventolr deenrir'ned friomn the :,istorical (10) minute data recorded by the PFRMS, sYstern for RF-O)013. The (110) minute average used shall be from the three hour period prior to tank sAwitchover or the waste gas system being shutdown, with the period 30 minutes prior to tank switchover or the waste gas system being shutdown being preferred.

4.2.3 In the event that RE-0013 is out of sertvice, the Gas Decay Tanks that have been in service in the previous (24) hours must be sampled and analyzed for contained radioactivity, as outlined in subsection 4.3.3 of this procedure.

4.3 WASTE GpkS DECAY TANMK FRADIONUCLIDE INVENTORY DETERNI I NATI ON 4.3.1 The Gain factor for PERMS monitor RE-0013 was determined bv calculating the monitor response for Xe-133. The response to obtain the maximum allowable activity per tank would exceed the maximum range of the detector; therefore if the monitor is on scale and exceeding the Alarm Set points, the total activity in the individual tank is still below the allowable limits of 2.0 E+5 curies 4.3.2 Use attachments I or 2 to determine the waste uas radionuclid.- inventory Printed March 16.2006 at 10:29

Approved By I . . 6 Procedure Number Rev B. D. Carter Nlogtle Electric Generating Plant 35430-C 24 Date Approved MONITORING OF TIHE RADIOACTIVE GASEOUS WVASTE MIANAGE1.NIENT Page Number 02/23/2004 _ SYSTENI 7 of 15 4.4 SYSTEMI SPECIFICATIONS I The system specifications and corrective actions for the Gaseous Waste Processing System are:

Parameter Speccfication Corrective Actions Oxygen 2%_/ wheict Hi- Reduce the oxygen 40' concentration to within limits (see Notes A & B)

Hydrogen Monitor with 02 concentration Parameter Specification Corrective Actions Total Contained 2.0 E+5 Ci Suspend all additions of Radioactivity noble gases radioactive materials to the (as Xe-I 33) tank and, within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, reduce the tank contents to below the limit.

Note A) With the concentration of oxygen in the Gaseous Waste Processing System greater than 2% by volume but less than or equal to 4% by volume, reduce the oxygen concentration to the above limits within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

Note B) W'ith the concentrction of oxygen in the Gaseous Waste Processing System greater than 4% by volume and the hydrogen concentration greater than 4% by volume, immediately suspend oxygen additions and all additions of waste gases to the system and reduce the concentration of oxygen to less than or equal to 4% by volume, then reduce the oxygen concentration to less than or equal to 2%/o by volume within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

4.5 CALCULATION OF Xe-133 EQUIVALENT ACTIVITY I 4.5.1 Calculate Xc-l 33 Equivalence using the Attachment 3 to the procedure.

4.6 SY'STEM1 MONITORS I The GWPS is normally monitored by on-line hydrogen and oxygen monitorS. A minimum of the inlet hydrogen monitor and two oxygen monitors per recombiner are required by the Technical Requirements Manual Printed March 16,, .006 at 10:29

Approved By Procedure Number Rev B. D. Carter _ _ ogtlc Electric Gcierading Plant jr& 35430-C 24 Date Approved NIONITORING, OF TlHE RADIOACTIVE GASEOUS WASTE NIANAG EN1 ENT Page Nunrber 02/23/2004 SYSTEM 8 of 15 4.6.1 Oxygen Monitors 4.6.1.1 Action B.1 and B.2 - WAith the outlet Oxygen Monitor Channel inoperable, operation of the system may continue provided grab samples are taken and analyzed at Icast once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and the oxygen concentration remains less than 1 percent.

4.6.1.2 Action A. l - With lhc Inlet O.(ygeu cIlontitcr Chainel! inopenliiile, operation may continue if irlet hydrogen monitor is OPERABLE.

4.6.1.3 Action D.l and D.2 and D.3 - With both oxygen channels or both the inlet oxygen and inlet hydrogen monitors inoperable, suspend oxygen supply to the recombiner. Addition of waste gas to the system may continue provided grab samples are taken and analyzed at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> (luring degassing operations or at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during other operations and the oxygen concentration remains less than I percent.

4.6.2 Hydrogen Monitors 4.6.2.1 Action D.1 and D.2 and D.3 - WVith one or more hydrogen monitors inoperable, suspend oxygen supply to the recombiner. Addition of waste gas to the system may continue provided grab samples are taken and analyzed at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during degassing operations or at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during other operations and the oxygen concentration remains less than 1 percent.

5.0 REFEREN'CES 5.1 VEGP Technical JR'quirements Manofl 5.2 NUREG 1.1(09 Oct 1977 Revision I 5.3 PROCEDURES 5.31 35516-C, "Operation Of The Nuclear Sampling System-Gaseous" 5.3.2 33035-C, "Gamma Spectroscopy For Radiochemistry" 5.3.3 301 70-C, "Cneniistiy Department Interface Agreements" 5.3.4 30090-C, "Chemistry Technical Specifications Surveillance Performance Coordination" 5.4 ODCM END OF PROCEDURE TEXT Printed March 16. 2006 at 10:29 . ..... --

Approved By . E . Procedure Number Rev B. D. Carter I XogtIe dleetr CGenerating Plant 35430-C 24 Date Approved MiONITORING OF THE RADIOACTIVE GASEOUS WASTE MANAGEMENT Page Numrer

) 02/23/2004 SN'STEM 9 of 15 DATA SHEET 1 UNIr GDT#

A. PERMS MONITOR RE-6013 MEITHOD Date/Time of reacting CURRENT 10 MIN AVG RE-0013 reading ucilcc [] [1 GDT EQUIV Xe 133 Calculation: .1 ecci (RE-0013 reading in uci/cc) x 1.699 E +01 i

'i! t I

TOTAL CURIES Xe 133 EQUIV_

III

[ ] Yes [ ] No Monitor operable (ixE-(0 1I3)

Calculated by: Date IReviewed by: Date i

Ii I

j Printed March 16,2)06 at 10:29

Approved By . Procedure Number Rev B. D. Carter Vogtle Electric Gednerating Plant AK 35430-C 24 Date Approved NI ONITOWING OF TlHE RADIOACTIVE GASEOUS WASTE NIANAGENIENT Page Nuirber 02/23/2004 I SYSTEIM 10 of 15 DATA SHEET 2 Sheet I of I TOTAL EQUIVALENT Xe-133 UNIT GDT #_

B SAMPLING AND ANALYSIS M4ETHOD EQIJI*\1LENT XENON-133 A.CTIVITY WORKSH EET' NUCLIDE ACTIVITY uCi/cc DOSE FACTOR EQUIVALENb Xe-133 Ar-41 X 3.01 E+1 Xe-131M X 3.11E-1 Xe-1 33 X 1.00 4 Xe-1 33M X 8.54E-1 1 Xe-135 X 6.16E0 ri i

Xe-1 35M X 1.06E+1 Xe-1 37 X 4.83E0 i ki Xe-1 38 X 3.0OE+1 I I

Kr-83M X 2.57E-4

'I I

Kr-85 X 5.48E-2 Kr-85M X 3.98E0 r j Kr-87 >1 2.01E+1 I Kr-88 X 5.00E+1 i

Kr-89 X 5.65E+1 EQUIVALENT Xe-1 33 ACTI 'ITY Date/Time of Sample Gas Decay Tank Pressure __PSIG Equivalent Xe- 133 Activity_ uCi/cc TOTAL EQUIVALENT e-133 CALCULATION:

r(GD7'1s~ig+ 14.7) 1.0E-0

[1.699 E + 07cc] 14.7 [Equivalent Xenon][1.O E -06 Ci]

TOTAL CURIES Xe-1 33 EQUINV__

Calculated oy: Date Reviewed by: -Date Printed March 16, 2006 at 10:29

Appmnved By I- 9r--

U I'mcedure Number Rev

'. D. Carter Viogtlc Electric Gncralting Plant A 35430-C 24 Dax Arprov cd I. MONiTORING OF THIE RADIOACTIVE GASEOUS WASTE MANAGEMENT SYSTEM Pag-e Number 02/23/2004 I1I nf 15

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jI saji E REL IE1 GASEOUS RADIOCTIVE WASTE SYSTEMVI LINED UP FOR LOW PRESSURE OPERATION TO TANK 6 UNIT I (UNIT 2 IDENTICAL)

FIGURE 1 Printtd March 16, 2006 at 10:29

C- r r-Approved By I

.'gtle Lcctr.. .. C.. (N~

ifg PI' 111t ~.4PIrocedure 1 35430-C Number Rev B. I. Cart r i ... 24 IDatc A-.I,,.- s NiONITORIN- OF TIHE RADIOACTIVIE GASEOUS WASTE MANAGEMENT SYSTEM Page Number 102/23/2004 12 of 15_

TARr.F I IGAr(,TU GASEOU'S

- EE EFF1LU-ZT M0 1\ITORING YNST"1RUMENTATTON

'DC1 2and T-ZCHNICkL REQUIRtEMENTS MANUAL ACTIONS MINIMUM CHANNELS INS - R JEV lT OPERAS"LE APPLICAB ILIri' ACTION

1. GASECUSO'VASTE PROCESSING SYSTEM notel ia. Nc'_,!e Gas Activity Monitor - Providing Alarm, and Automatic Termination of ,j 45 Release (ARE-0014) (Common)

b. Effluent System Flow Rate Measuring Device (AFT-0014) (Common) 1 46

2. GASEOUS WASTE PROCESSING SYSTEM Explosive Gas Monitoring System note 2

a. Hydrogen Monitor 1/recomnbiner D

b. Oxygen Monitor 2/recombiner D or B

3. CONDENSER AIR EJECTOR AND STEAM PACKING EXHAUST SYSTEM note 1

a. Noble Gas Activity Monitor 1 47 (RE-1 2839C)

b. Iodine Sampler 1 (RE-1 2839B)

c. Particulate Sampler 1 51 (RE-1 2839A)

d. Flow Rate Monitor 1 46 (FT-1 2839) (FT-1 2862)

e. Sampler Flow Rate Monitor 1 46 (Fl-1 321) note 1- ODCM requirements note 2- Technical Requirements Manual requirements Printed March 16, 2006 at 10:29

ApproveLd By ~ *~4Procedure Number Rev Bl.D. Carter ogtle Electric Generating PIant A 35430-C 24 Date Approved MO Ni1 0 1ING OF T11E RADIOACTIVE GASEOUS WASTE NIANAGENI ENT Page Numbcr 0223/2004 SYSTENI ]13 of 15 REFERNCE USE Sheet I of 1 ATTIACHMENT I 1.0 WASTE GAS DECAY TANIC RADIONUCLIDE INVENTORY DETERMINATION 1.1 Per-ns Monitor RE-0O 13 Method 1.1.1 ENSURE PERMS monitor RE-001 3 is in oreration, if not use the Grab Sampling Met4hodology 1.1.1.1 RE-0013 must be operational using the following parameters:

a. GAIN FACTOR = 3.70E-02 ftCi Xe-133/cc/cpm

b. HIGH A0,ARM = 2.35 x 10n3 lCi Xe-133/cc

c. ALERT ALARM = 2.35 x 102 pCi Xe-133/cc f#! 1.1.2 ENSURE PERMS monitor RE-0013 is not in alarm, if it is in alarrn use the Grab Sampling Methodology 1.2 If the current reading and the latest (10) minute readings indicate 0.OOE+00, observe the pro'ious (6) ten minute averages.

1.3 If these previous ieadings are also O.OOE-FOO and the channel is operating normally (i.e.

no low fail alarms, ton of scale alarms, power failure) then these zero readings may be uscsd. Refier tc, 1.5 below.

1.4 Record the current monitor reading or the latest (10) minute average (pCi/cc) and the tank number of the in-service tank of Data Sheet 1.

i.5 Check if current reading or (1 0) minute averagc is used on Data Sheet 1.

NOTE A separate data sheet must be used for each tank in service in the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

1.6 Calculate conained Xe-133 activity using the formula on Data Sheet l.

1.7 When using the zero reading for this calculation, log *5.1 curies because the total activity of the tank wvill be <5. curies.

P'rinted March 16.e 006 at I0:29

Approved By PntProcedure Number Rev B. D. Carter I "

Iogtle Electric Generating Plant 24 Dat: Approved - NIMONITORIN(C OF TIHE RADIOACTIVE GASEOUS WASTE MANAGEMENT Page Number i 02/23/2004 SYSTEM _____14 of 15 REFERENCE- USE Sheet I of 1 ATTACHMENT 2 1.0 Waste Gas Decay Tank Sampling Method NOTE:

All GDT's in service in the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> shall be sampled for contained.

activity.

1.1 Prior to sampling Gas Decay Tanks (GDT's). contact Operations Department to verify which GDT is in service and what GDT's have been in service in the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

1.2 Sample Location 1.2.1 Samples of the GWP'S are collected locally cn "B" level of the Aux Building in accordance with Procedure 33015-C "Obtaining Gaseous Samples for Radioactivity i Analysis."

1.2.2 Samples of the GWPS are collected at the Nuclear Sampling System Gaseous Sample Panel 1211 -P5-NSG in accordance with Proctedure 35516-C "Operation Of The Nuclear Sampling System - Gaseous" 1.3 Determine the Xe-I 33 equivalent activity per Atta2hment 3 of this procedure.

Printed March 16. 2006 at 10:29

Approved By ~7 lcrc ~ PatProcedure Plumber Rev B.~~~~

IB.D. Carter D.Votr l 7gtle E~lect~ric lgie ~ Gener ating Plant A ecang35430-C dr ume 24 vl Datc Approved MONITORING OF TIHE RAD)IOACTIVE GASEOUS WASTE MIANAGENIENT Page Number 02/23/2004 SVSTENM 15 of 15 REFEREN CE USEE Sheet I of I ATTACHMENT 3 1.0 CALCULATION OF Xc-133 EQUJIVALENT ACTIVITY Analyze a gas decay tank sample in accordance with Procedure 33035-C, "Gamma Spectroscopy For Radiochemistry".

NOTE Normal method is option from menu on the gamma spectroscopy system.

The manual method provided here is not routinely used. The computer.

generated data sheet may be used lor documentation in lieu of Data Sheet 2.

1.2 Use the gamma spectroscopy computer prog amr to calculate the Xc-l 33 equivalence or; 1.2 Calculate the Xe-133 equivalence manually.

• 1.2.1 Enter uci/cc of each nuclide reported frorn the gamma spectrum analysis in column 2 of Data Sheet 2, Equivalent Xenon Activity Worksheet.

1.2.2 Multiply the activity by the appropriate dose factor for the nuclide of interest and enter the product in the right hand column.

1.2.3 Total the values in the right-hand column for Equivalent Xc-133 activity 1.2.4 Multiply the equivalent Xe- 133 activity by the volume of gas in the Decay Tank

[1.699 7 cc(psihtank+/-i 14.7)]

(14.7) 1.2.5 Multiply by I E-6; this will give the total Xc-133 equivalent activity in Curies for the Gas Decay Tank. (See Data Sheet 2) 1.2.6 Notify laboratory supervision of any out-of-specification conditions.

1.2.7 Report analysis results to Operations in accordance with applicable Chemistry procedures, or a phone call to Operations will suffice as an alternative.

x..

Printed March 16. 2006 at I1029