RS-09-128, Revision 6 to Exelon Nuclear Standardized Radiological Emergency Plan Implementing Procedure EPIP-07, Calculation of Station Noble Gas and Particulate Release Rate to Determine Dsep Classification

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Revision 6 to Exelon Nuclear Standardized Radiological Emergency Plan Implementing Procedure EPIP-07, Calculation of Station Noble Gas and Particulate Release Rate to Determine Dsep Classification
ML092610274
Person / Time
Site: Zion  File:ZionSolutions icon.png
Issue date: 09/17/2009
From: Simpson P
Exelon Generation Co, Exelon Nuclear
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-09-128 EPIP-07, Rev 6
Download: ML092610274 (22)
v • d • e


Text

Exelon Generation Exel6n Nuclear www.exeloncorp.com g3oo'JVinfield Road Warrenville, IL 6o555 RS-09-128 10 CFR 50.4 10 CFR 50 Appendix E September 17, 2009 U . S. Nuclear Regulatory Commission ATTN : Document Control Desk Washington, DC 20555-0001 Zion Nuclear Power Station, Units 1 and 2 Facility Operating License Nos. DPR-39 and DPR-48 NRC Dock et Nos. 50-295 and 50-304

Subject:

Revision to Exelon Nuclear Standardized Radiological Emergency Plan Implementing Procedure in accordance with 10 CFR 50, Appendix E, Section V, "Implementing Procedures," Exelon Generating Company, LLC (EGC) is submitting changes to the following Emergency Plan procedure.

Procedure No. Revision Title EPIP-07 6 CALCULATION OF STATION NOBLE GAS AND PARTICULATE RELEASE RATE TO DETERMINE DSEP CLASSIFICATION These changes were evaluated under the requirements of 10 CFR 50 .54(q) and were determined not to result in a decrease in the effectiveness of the Emergency Plan. The revised procedure was implemented on August 20, 2009, and is being submitted within 30 days of implementation as required by 10 CFR 50, Appendix E. A copy of the revised procedure is provided in the attachment to this letter .

There are no commitments in this letter. If you have any questions concerning this letter, please contact Amy Hambly at (630) 657-2808 .

Respectfully, Patrick R. Simpson Manager - Licensing

Attachment:

EPIP-07, Revision 6, "Calculation of Station Noble Gas and Particulate Release Rate to Determine DSEP Classification"

Attachment EPI P-07 "Calculation of Station Noble Gas and Particulate Release Rate to Determine DSEP Classification" Revision 6

EP I P-07 Revision 6 CALCULATION OF STATION NOBLE GAS AND PARTICULATE RELEASE RATE TO DETERMINE DSEP CLASSIFICATION August 20, 2009 Zion Station UNIT 1, 2 AND COMMON Summary of Changes in this Revision :

" Added additional instructions for obtaining noble gas and particulate readings from 2RIA-PR49 .

" Added Attachments 7 and 8 for converting ORT-PR30A(B) voltage to pCi/cc for noble gas and particulate.

" Added instructions for obtaining ORT-PR30A(B) readings from the SFNI DAS PI Process Book.

" Removed references to "Point History" Program .

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EPIP-07 Revision 6 Table of Contents A. PURPOSE . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . .3 B . SCOPE . . . . . . .. . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. . . . . . . . .. . . . . . . . . . . . .. . . .. . . . . . . . .3 C. REFERENCES . . . . . . . . . . . . . . . . . . . . .. . . .. . . . . . . . .. . . .. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 D . PREREQUISITES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .. . . .. . . . . . . . .. . . .. . . . . . . . . . . . .. . . . . . .3 E. PRECAUTIONS . . . . . . . . .. . . .. . . . . . . . .. . . .. . . . . . . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .3 F. LIMITATIONS AND ACTIONS . . . . . . . . . . . . .. . . . . . . . . . . . .. . . .. . . . . . . . .. . . .. . . . . . . . . . . . .. . . . . . . . .. . . . . . . . .4 G. MAIN BODY . . .. . . .. . . . . . . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 1 . Vent Stack Pathway .. . . . .. . . . . . . .. . . .. . . . . . . . .. . . .. . . . . . . . .. . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . .5 2 . Fuel Building Pathway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . .5 3 . Total Station Release .. . . .. . . . . . . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 4 . Follow-up Activities . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . .. . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . ..7 ATTACHMENT 1 : Vent Stack Noble Gas Release Rate Determination . . . . . . . . . . . . . .8 ATTACHMENT 2 : Fuel Building Noble Gas Release Rate Determination . . . . . . . ..10 ATTACHMENT 3: Total Station Noble Gas Release Rate Determination . . . . . . . . . .11 ATTACHMENT 4: Vent Stack particulate Release Rate Determination . . . . . . . . . . . . 12 ATTACHMENT 5: Fuel Building Particulate Release Rate Determination . . . . . . . . . 16 ATTACHMENT 6: Total Station particulate Release Rate Determination . . . . . . . . . . 18 ATTACHMENT 7 : ORT-PR30A Fuel Building Exhaust Noble Gas Monitor . . . . . . . . 19 ATTACHMENT 8: ORT-PR30B Fuel Building Exhaust Particulate Monitor . . . . . . . . 20

EP I P-07 Revision 6 A. PURPOSE The purpose of this procedure is to provide a method to estimate the station noble gas and particulate release rates to determine if a DSEP classification exists during an unplanned or abnormal release .

B. SCOPE Applies to personnel assessing unplanned station radioactive releases .

C. REFERENCES

1. Section 5 .0 of the DSEP, Classification of Emergencies D. PREREQUISITES None E. PRECAUTIONS None

EPIP-07 Revision 6 F. LIMITATIONS AND ACTIONS

1. The Operating Staff should obtain RadChem Supervision support for an independent calculation of the Maximum Instantaneous Release Rate.
2. If the release cannot be assessed because the monitors used in this procedure are not on scale or are inoperable, Then obtain a noble gas grab sample and particulate filters to assess the release.
3. The only available noble gas at Zion Station is Kr-85 . It is only present in the fuel rods stored in the fuel building spent fuel pool .
4. When this procedure has been completed, Then RadChem Supervision should calculate the release rate and quantity based on isotopic data in order to report the percentage of the 10CFR20 release rate and incorporate the release quantities into the applicable effluent release reports .

EP I P-07 Revision 6 I G. MAIN BODY- RELEASE QUANTIFICATION

1. Vent Stack Pathway 1 .1 . DETERMINE the release concentration out the U2 stack pathway And USE Attachment 1 to determine the stack noble gas release rate . Use Attachment 4 to determine the stack particulate release rate.

1 .1 .1 . If 2RIA-PR49 SPING is operable, Then , USE the channel 5 value on Attachment 1 as the stack noble gas release concentration .

1 .1 .2 . If the SPING is inoperable, Then , obtain and analyze a noble gas sample from the SPING . Use the isotopic result on Attachment 1 as the stack release concentration .

1 .1 .3. If 2RIA-PR49 SPING is operable, Then USE the channel 1 value on Attachment 4 as the stack particulate release concentration .

1 .1 .4. If the SPING is inoperable, Then obtain and analyze the channel 1 particulate filter from the SPING . Use the isotopic result on Attachment 4 as the stack release concentration .

2. Fuel Building Pathway 2 .1 . DETERMINE the release concentration out the fuel building ventilation pathway And USE Attachment 2 to determine fuel building noble gas release rate. Use Attachment 5 to determine the fuel building particulate release rate.

2.1 .1 . If ORT-PR30A is operable, Then, use the monitor value on Attachment 2 as the fuel building noble gas release concentration .

2 .1 .2. If ORT-PR30A is inoperable, Then , obtain and analyze a noble gas sample from ORT-PR30A. Use the isotopic results on Attachment 2 as the fuel building release concentration.

2.1 .3. If ORT-PR30B is operable, Then use the monitor value on Attachment 5 as the fuel building particulate release concentration .

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EPIP-07 Revision 6 2 .1 .4. If ORT-PR30B is inoperable, Then obtain and analyze the monitor particulate filter. Use the isotopic results on Attachment 5 as the fuel building particulate release concentration .

EP I P-07 Revision 6

3. Total Station Release 3.1 . COMPLETE Attachment 3 . Sum attachments 1 and 2 to determine the total station noble gas release rate .

3 .2. COMPLETE Attachment 6. Sum Attachments 4 and 5 to determine the total station particulate release rate.

3.3. Compare the total station release rate to release rate limits in Section 5 .0 of the DSEP 3.4 . Classify event if release rate limits of EAL's RU-1 or RA-1 are exceeded .

4. Follow-up Activities 4.1 . As soon as possible after initial calculations using monitor data, RadChem should obtain and analyze noble gas samples and particulate filters from the affected release pathways .

4.2 . RadChem should recalculate release rates using available isotopic analysis .

4 .3. RadChem should CALCULATE And DOCUMENT total activity released for inclusion in applicable effluent release reports .

EPIP-07 Revision 6 ATTACHMENT 1 Vent Stack Noble Gas Release Rate Determination (2RIA-PR49)

1. Determine the maximum noble gas release concentration out the U2 stack pathway using step (1 .1) or (1 .2):

1 .1 If SPING channel 5 is operable, Then document the maximum U2 stack noble gas concentration using one of the following methods :

1 .1 .1 Obtain "U2 Stack Noble Gas Lo Rang" reading from the 2RIA-PR49 PI Process Book.

1 .1 .2 At the SPING control terminal select `Hist Min', key in '01-05' select `enter', select `+/T' to review the one-minute averages for the previous 24 minutes of history, and record the highest available reading .

1 .1 .3 If the SPING printer is available, Then , at the SPING control terminal, use the `Hist Min' command to print the most recent one-minute averages for channel 5 . Record the highest reading for channel 5.

U-2 stack noble gas concentration p.Ci/cc .

1 .2 If SPING is inoperable, Then , OBTAIN and document isotopic data for the highest level possible during the release . (Notify RadChem to collect and analyze a gas grab sample or use data RadChem may have already collected in response to monitor high alarms) .

U-2 stack noble gas isotopic results ~ICi/cc .

EPIP-07 Revision 6 I ATTACHMENT 1 (continued)

2. DETERMINE the maximum U2 stack flow during the release period using step (2.1) or (2 .2) as listed in priority :

2.1 OBTAIN "U2 stack flow" data for the period of the release from the 2RIA-PR49 PI Process Book.

RECORD the U2 stack flow rate yielding the highest flow for any one-minute interval during the release period AND calculate the flow rate in cc/sec .

U2 cfm

  • 472 = cc/sec 2.2 RECORD the number of operating U2 Aux Building exhaust fans for the period of the release And CALCULATE the stack flow rate in cc/sec .

) U2 ( * (67,000 cfm)

  • 472 = cc/sec
  1. fans
3. CALCULATE the noble gas release rate for the U2 vent stack.

U2 (concentration gCi/cc) (from step 1 .1 or 1 .2) *

(flow cc/sec) (from step 2 .1 or 2 .2) = u Ci/sec

4. After initial calculations are performed, Rad Chem should re-perform release rate determinations (the maximum release rate during the release) using available isotopic analyses .

Name/Date

EP I P-07 Revision 6 ATTACHMENT 2 Fuel Building Noble Gas Release Rate Determination (ORT-PR30A)

1. Determine the maximum noble gas release concentration out the fuel building ventilation pathway using step (1 .1) or (1 .2):

1 .1 If ORT-PR30A (noble gas) is operable, Then, document the release concentration using ORT-PR30A data from the DAS display or the "Rad Monit - Noble Gas" reading from the SFNI DAS PI Process Book.. Use the maximum recorded voltage reading during the period of the release, and convert to ~iCi/cc using Attachment 7.

ORT-PR30A voltage reading volts ORT-PR30A concentration pCi/cc.

1 .2 If ORT-PR30A is inoperable, Then , OBTAIN and document isotopic data from ORT-PR30A for the highest level possible during the release (notify Rad Chem to collect and analyze a gas grab sample or use data Rad Chem may have already collected in response to monitor high alarms) .

Fuel building ventilation isotopic results J.Ci/cc .

2. CALCULATE the maximum fuel building noble gas release rate .

Release concentration ~iCi/cc (from step 1 .1 or 1 .2)

  • 7.1 E+06 cc/sec = V,Ci/sec.
3. After initial calculations are performed, RadChem should re-perform release rate determinations (the maximum release rate during the release) using available isotopic analyses .

Name/Date

EPIP-07 Revision 6 ATTACHMENT 3 Total Station Noble Gas Release Rate Determination

1. CALCULATE the total station noble gas release rate.

U2 stack noble gas release rate pCi/sec . (from Aft. 1 step 3.)

Fuel building noble gas release rate [,Ci/sec. (from Aft. 2 step 2 .)

_ pCi/sec total station noble gas release rate

2. COMPARE the total station noble gas release rate to the release rate limits listed in EALs

EPIP-07 Revision 6 ATTACHMENT 4 Vent Stack Particulate Release Rate Determination (2RIA-PR49) 1 . Determine the maximum particulate release concentration out the Unit 2 stack pathway using step (1 .1) or (1 .2):

1 .1 If SPING channel 1 is operable .

1 .1 .1 Document the particulate release concentration using one of the following methods :

1 .1 .1 .1 Obtain "U2 Stack Beta Particulate" reading from the 2RIA-PR49 PI Process Book.

1 .1 .1 .2 At the SPING control terminal select 'Hist Min', key in

'01-01', select `enter', select `+/T' to review the one-minute averages for the previous 24 minutes of history, and record the highest available reading .

1 .1 .1 .3 If the SPING printer is available, Then, at the SPING control terminal, use the ' Hist Min' command to print the most recent one-minute averages for channel 1 . Record the highest reading .

U-2 Channel 1 reading cpm 1 .1 .2 Calculate the corresponding activity (A) using the response conversion factor of 1 .29 E+05 cpm/ACi as follows:

A =count rate cpm (from step 1 .1 .1) - 1 .29 E+05 cpm/V,Ci =

EPIP-07 Revision 6 1 .1 .3 Obtain the channel 10 sample flow reading in cfm for 2RIA-PR49 using one of the following methods, and convert to cc/sec using the calculation below:

1 .1 .3.1 At the SPING control terminal select 'Hist Min', key in

'01-10', select `enter', select'+/T' to review the one-minute averages for the previous 24 minutes of history, and record the lowest reading . If the SPING control terminal is unavailable, obtain the channel 10 sample flow reading locally at either 2RIA-PR49 or 2LP-084 .

1 .1 .3 .2 If the SPING printer is available, Then, at the SPING control terminal, use the 'Hist Min' command to print the most recent one-minute averages for channel 10.

Record the lowest reading:

U-2 Channel 10 reading cfm

  • 472 = cc/sec 1 .1 .4 Calculate the radiation monitor sample volume (SV) based on a ten minute sample time :

SV = 600 sec.

  • Channel 10 flow cc/sec (from step 1 .1 .3.) = cc 1 .1 .5 Calculate the isotopic concentration (C) assuming a filter efficiency of 95% as follows:

C = 1 .05

  • A pCi (from step 1 .1 .2.) - SV cc (from step 1 .1 .4)

~tCi/cc

EPIP-07 Revision 6 ATTACHMENT 4 continued 1 .2 If SPING is inoperable, Then OBTAIN and document isotopic data for the highest level possible during the release. Notify RadChem to collect and analyze the filter paper.

RadChem should use the minimum sample flow rate observed when performing the isotopic analysis .

Sample flow cfm The duration of the event should be used as the filter exposure time . The duration of the event will be estimated by the Shift Supervisor and provided to RadChem to use for the isotopic analysis along with the recorded sample flow . If the event duration cannot be estimated, a conservative value of 15 minutes will be used . Record duration of event :

Duration of event minutes Record U-2 vent stack particulate isotopic concentration results obtained from RadChem:

Isotopic concentration (C) results : PCi/cc

EPIP-07 Revision 6 ATTACHMENT 4 continued

2. DETERMINE the maximum stack flow for the U2 stack during the release period by either step (2 .1) or (2.2) as listed in priority :

2 .1 OBTAIN "U2 stack flow" data for the period of the release from the 2RIA-PR49 PI Process Book.

RECORD the U2 stack flow rate yielding the highest flow for any one-minute interval during the release period AND calculate the flow rate in cc/sec .

U2 cfm

  • 472 = cc/sec 2.2 RECORD the number of operating U2 Aux Building exhaust fans for the period of the release And CALCULATE the stack flow rate in cc/sec .

U2 ( ) * (67,000 cfm)

  • 472 = cc/sec
  1. fans
3. CALCULATE the total release rate for the U2 vent stack.

U2 (concentration pCi/cc) (from step 1 .1 .5 or 1 .2) * (flow cc/sec) (from step 2 .1 or 2.2) = pCi/sec

4. After initial calculations are performed, RadChem should re-perform release rate determinations (the maximum release rate during the release) using available isotopic analyses .

Name/Date

EP I P-07 Revision 6 ATTACHMENT 5 Fuel Building Particulate Release Rate Determination (ORT-PR30B)

1. Determine the maximum release concentration out the fuel building ventilation pathway using step (1 .1) or (1 .2):

1 .1 If ORT-PR30B (particulate) is operable, Then , document the release concentration using ORT-PR30B data from the DAS display or the "Rad Monit - Particulate" reading from the SFNI DAS PI Process Book. Use the maximum recorded voltage reading during the period of the release, and convert to k,Ci/cc using Attachment 8.

ORT-PR30B voltage reading volts ORT-PR30B concentration pci/cc.

1 .2 If ORT-PR30B (particulate) is inoperable, Then OBTAIN and document isotopic data for the highest level possible during the release. Notify RadChem to collect and analyze the filter paper.

Sample flow cfm The duration of the event should be used as the filter exposure time . The duration of the event will be estimated by the Shift Supervisor and provided to RadChem to use for the isotopic analysis along with the recorded sample flow. If the duration cannot be estimated, a conservative value of 15 minutes will be used . Record duration of event:

Duration of event minutes Record fuel building particulate isotopic concentration results obtained from RadChem :

Fuel building ventilation isotopic results pci/cc.

EP I P-07 Revision 6 ATTACHMENT 5 continued

2. CALCULATE the maximum fuel building release rate .

Release concentration pCi/cc (from step 1 .1 or 1 .2)

  • 7 .1 E+06 cc/sec pCi/sec.
3. After initial calculations are performed, RadChem should re-perform release rate determinations (the maximum release rate during the release) using available isotopic analyses .

Name/Date

EPIP-07 Revision 6 ATTACHMENT 6 Total Station Particulate Release Rate Determination

1. CALCULATE the total station release rate.

U2 stack particulate release rate ~tCi/sec. (from Aft. 4 step 3 .)

Fuel building particulate release rate ACi/sec. (from Att. 5 step 2 .)

pCi/sec total station particulate release rate COMPARE the total station particulate release rate to the release rate limits listed in EALs

EPIP-07 Revision 6 ATTACHMENT 7

EPIP-07 Revision 6 ATTACHMENT 8 ORT-P 308 Fuel Buiding FXhaUSt Particulate Monitor

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