ML031920488

Revision to EP-PS-249, EOF Dose Calculator

ML031920488
Person / Time
Site:	Susquehanna
Issue date:	06/24/2003
From:	Susquehanna
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML031920488 (51)

Text

Jun. 24, 2003 Page 1 of 1 MANUAL HARD COPY DISTRIBUTION DOCUMENT TRANSMITTAL 2003-29967 USER INFORMATION:

Nam CH f M EMPL#:28401 CA#:0363 Address: 2 Ph ne*: 54-31 TRANSMITTAL INFORMATION:

TO: _ 06/24/2003 LOCATION: DOCUMENT CONTROL DESK FROM: NUCLEAR RECORDS DOCUMENT CONTROL CENTER (NUCSA-2)

THE FOLLOWING CHANGES HAVE OCCURRED TO THE HARDCOPY OR ELECTRONIC MANUAL ASSIGNED TO YOU:

249 - 249 - EOF DOSE CALCULATOR REMOVE MANUAL TABLE OF CONTENTS DATE: 01/21/2003 ADD MANUAL TABLE OF CONTENTS DATE: 06/23/2003 CATEGORY: PROCEDURES TYPE: EP ID: EP-PS-249 REPLACE: REV:0 REPLACE: REV:0 REMOVE: PCAF 2002-1660 REV: N/A ADD: PCAF 2002-1660 REV: N/A UPDATES FOR HARD COPY MANUALS WILL BE DISTRIBUTED WITHIN 5 DAYS IN ACCORDANCE WITH DEPARTMENT PROCEDURES. PLEASE MAKE ALL CHANGES AND ACKNOWLEDGE COMPLETE IN YOUR NIMS INBOX UPON RECEIPT OF HARD COPY. FOR ELECTRONIC MANUAL USERS, ELECTRONICALLY REVIEW THE APPROPRIATE DOCUMENTS AND ACKNOWLEDGE COMPLETE IN YOUR NIMS INBOX.

Tab 1 EP-PS-249-1 METNENT DATA ACQUISITION OPTIONS The following are sources of meteorological and ventilation data at Susquehanna SES:

A. ACQUISITION OF METNENT DATA FROM THE PICSY TERMINAL

1. From the SSES LOGO display, select E-PLAN MENU or type EPM and [ENTER].

2. All required meteorological and ventilation (METNENT) inputs for the MIDAS dose projections can be obtained by selecting the METNENT DATA display option on the E-PLAN menu.

a. Vent and Primary Met Tower Data is displayed on page 1 of this display.

b. Use the PAGE FORWARD command if the Back-up Tower data is required.

c. Should neither the Primary or Back-up Tower be available, obtain the Downriver Tower data as follows:

1) At the command line, type GD_VMS05B and [ENTER] for Downriver Tower wind speed.

2) At the command line, type GD_VMX09B and [ENTERI for Downriver Tower wind direction.

3) At the command line, type GD_VMX1 OB and [ENTER] for Downriver Tower sigma theta.

4) Press Escape [ESCI to return to the SSES Logo display.

d. Other options - see Step 6 below.

3. If the Primary Met Tower AT data is not available, determine the wind speed corrected stability class as follows:

a. Determine the initial (uncorrected) stability class using the measured value of sigma theta and the Supplemental Meteorological Information Table 1 (or page 2 of the PICSY screen).

b. Determine the wind speed corrected stability classification using the initial classification, the measured wind speed, and, as appropriate, either Table 2 or Table 3.

EP-AD-000-124, Revision 21, Page 1 of 8

Tab 1 EP-PS-249-1

4. The PICSY QUALITY CODES for the display colors are as follows:

YELLOW: DATA ACCEPTABLE RED: DATA EXCEEDS WARNING LIMIT MAGENTA: DATA EXCEEDS ALARM SETPOINT WHITE: DATA SUSPECT

5. If a hard copy printout of the information is required you may either:

a. Select-the PRINT option using the pull down menu (screen copy takes approximately 3 minutes to complete); or

b. Initiate the METNENT DATA LOG option as follows:

1) On the E-PLAN menu, select the FREE FORMAT LOG MENU.

2) To activate the TSC log, press [l1], [22], and [ENTER].

To activate the EOF log, press [l1], [9], and [ENTER].

NOTE: Be sure to read the log description because there are 2 logs for the TSC and 2 logs for the EOF.

3) The log will start printing at the next quarter hour.

4) To deactivate the TSC log, press [F3], [22], and [ENTER].

To deactivate the EOF log, press [F3], [9], and [ENTERI.

6. If historical METNENT information is required, refer to the following instructions:

a. At the command line, type: GDAMETVENT1 and [ENTER].

b. Group point display for that display file will come up. Press the F3] key for history.

(See bottom of screen for F key menu.) A dialog box will appear.

c. The work file name to be used is ARCHIVE.D, which is the default for that field.

d. Enter the desired retrieval time. Click on OK.

e. Group point display will return with values for the specified retrieval time.

f. Press the [F4] key to step through data points from the specified retrieval time to the current time.

NOTE: Not all desired data Is likely to be available for any one particular point In time.

EP-AD-000-1 24, Revision 21, Page 2 of 8

Tab 1 EP-PS-249-1

g. Press the [F4] key if you want to step slowly through the data. Press the [F5] key if you want to step quickly through the data. (See bottom of screen for F key menu for more options.)

h. The group point display will return to real time when history is complete. A message at the top of the screen will alert you that it is returning to real time.

6. To exit the menu, select the [ESC] key.

B. Site-specific meteorological information can be obtained by contacting either ABS Consulting or the National Weather Service (NWS).

1. ABS Consulting ABS Consulting is the primary meteorological contractor for the Susquehanna Steam Electric Station (SSES). ABS Consulting has the ability to interzogate the primary and backup meteorological towers on a real-time basis and provide short and long-term weather forecasts for the site and surrounding area.

ABS Consultinq Provides this emergency service to PPL ONLY during normal working hours. The SSES Project Manager's name, phone number and mailing address are as follows:

ABS Consulting Mark Abrams (301) 907-9100

• (301) 921-2362 (Fax)

ABS Consulting Suite 200 4 Research Place Rockville, MD 20850 EP-AD-000-124, Revision 21, Page 3 of 8

Tab 1 EP-PS-249-1

2. NATIONAL WEATHER SERVICE The National Weather Service's (NWS) primary meteorological support responsibility for a radiological emergency at SSES resides with the NWS office at Binghamton, New York. In the event the Binghamton office is unable to provide this support, the designated backup is the NWS office in State College, Pennsylvania.

The role of the local NWS office is to provide weather information and forecasts in support of emergency response activities at SSES. The NWS can be consulted over the telephone if data interpretations, assessment, or forecasting assistance are needed.

This information will include the following:

• Forecasts at current time and 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> of:

a. 10-meter and 60-meter wind speed and wind direction,_

b. Precipitation rate in inches per 15 minutes, and,

c. Boundary layer atmospheric stability described as STABLE, UNSTABLE, or NEUTRAL.

• Estimates of current 10-meter and 60-meter wind speed and wind direction in the event of complete loss of onsite and ofisite meteorological instrumentation.

• General weather forecast from current time to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> with special emphasis on significant weather occurrences such as major changes in wind speed, wind direction or synoptic weather patterns.

Periodic weather updates at time intervals dictated by the on-going weather and emergency situation.

NOTE: The NWS should ONLY be contacted when meteorological support from ABS Consulting Is not available (i.e., weekends, holidays. and during the overnight hours).

Whenever contacting the NWS, be sure to provide the following information:

• Name, Title, Facility, and Location

• Reason for the call

• Status of the Emergency

• Return telephone number EP-AD-000-124, Revision 21, Page 4 of 8

Tab 1 EP-PS-249-1 The following telephone numbers are UNLISTED and should only be used for EMERGENCY situations.

PRIMARY CONTACT NWS EMERGENCY METEOROLOGICAL SUPPORT OFFICE National Weather Service Office Binghamton Regional Airport 32 Dawes Drive Johnson City, NY 13795 (607) 798-6625 (607) 729-7629 (607) 798-6624 (Fax)

BACKUP CONTACT NWS EMERGENCY METEOROLOGICAL SUPPORT OFFICE National Weather Service Office 227 W. Beaver Avenue, Suite 402 State College, PA 16801 (814) 237-1152 (814) 237-1153 (814) 234-9703 (Fax)

EP-AD-000-124, Revision 21, Page 5 of 8

Tab 1 EP-PS-249-1 PLANT COMPUTER METEOROLOGICAL DATA POINT IDENTIFIERS METEOROLOGICAL AVERAGING PARAMETER POINT ID* UNITS PERIOD PRIMARY TOWER - east of the lant3' hi h dewh1te tower.

1Om Wind Direction vmaO3 degrees 15 minutes 1Om Wind Speed vmaO6 mph 15 minutes Delta T A' vmaOl 0CI50m 15 minutes Delta T 'B3 vmaO2 0C/50m 15 minutes 60m Wind Direction vmaO4 degrees 15 minutes 60m Wind Speed vmaO7 mph 15 minutes 1Om Sigma Theta vma1O degrees 15 minutes 60m Sigma Theta vmx24 degrees 15 minutes Precipitation Rate vmaO9 in/hr 15 minutes Ambient Temperature vmtO8b OF1 hour BACKUP TOWER - across from the SSES Learning Center.

1Oim Wind Direction I vmaO5 degrees 15 minutes 1Om Wind Speed vmaO8 mph 15 minutes 1Oim Sigma Theta vma12 degrees 15 minutes DOWNRIVER TOWER - on Rout 93 just east of escopeck. D _

1Om Wind Direction I vmxO9b degrees . 2 minutes**-

1Om Wind Speed vmsO5b mph I 2 minutes**

1Om Sigma Theta vmx1 Ob degrees 2 minutes*"

• Letters are given here In lower case to differentiate the letter o from the number 0.

EP-AD-000-1 24, Revision 21, Page 6 of 8

Tab 1 EP-PS-249-1 SUPPLEMENTARY METEOROLOGICAL INFORMATION TABLES TABLE 1 ATMOSPHERIC STABILITY CLASSIFICATION Stability Class Delta (Alternate) Plume Width Temperature Sigma Theta @10 miles  % of Hrs at Code Title ( 0C/50m) (degrees) (miles) SSES A Very Unstable *-.95 22.5 5.7 6 B Unstable -.94 to -.85 17.5 to 22.4 4.3 3 C Slightly Unstable -.84 to -.75 12.5 to 17.4 3.3 4 D Neutral -.74 to -.25 7.5 to 12.4 2.3 35 E Slightly Stable -.24 to .75 3.8 to 7.4 1.6 32 F Stable .76 to 2.0 2.1 to 3.7 1.1 12 G Very Stable >2.0 <2.1 .75 8 TABLE 2 TABrE 3 DAYTIME NIGHTTIME (08:00 to 18:00) (18:00 to 08:00 Initial Stability Class/ FINAL Initial Stability Classl FINAL Wind Speed (MPH) VALUE Wind Speed (MPH) VALUE A A Wind Speed < 7 A Wind Speed < 6 F 7 SWind Speed < 9 B 6 < Wind Speedc8 E 9 < Wind Speed < 13 C Wind Speed 2 8 D Wind Speed 13 D B

Wind Speed < 9 Wind Speed < 5 F 9 Wind Speed < 13 C 5 Wind Speed < 7 E Wind Speed 213 D Wind Speed 2 7 D C C Wind Speed < 13 C Wind Speed < 5 E Wind Speed 2 13 D Wind Speed > 5 D D, E, F, G D Any wind speed. D Any wind speed. D E

Wind Speed < 11 E Wind Speed 2 11 D Example: If wind speed is 9 mph and sigma F,G theta is 18 degrees @ 10 a.m., the initial Wind Speed < 7 F stability class from Table 1 is B" and the wind speed corrected stability class from Table 2 is 7 Wind Speed < 11 E "Co. Wind Speed 11 D EP-AD-000-124, Revision 21, Page 7 of 8

Tab 1 EP-PS-249-1 TABLE 4 WIND SECTORS AND DISTANCES. '

Wind From Affected Affected EPB* On-Site Team Site Boundary  % of Hrs Sector Degrees Sector Sector Distancemi) Distance (ml) Distance (mQ) Affected SSES 348 -11 N S 0.34 0.25 0.38 6 12 - 33 NNE SSW 0.34 0.37 0.39 9 34 - 56 NE SW 0.34 0.33 0.61 12 57 - 78 ENE WSW 0.34 0.39 1.22 11 79-101 E W 0.34 0.37 1.03 6 102 - 123 ESE WNW 0.34 0.41 0.61 4 124 - 146 SE NW 0.34 0.35 0.66 4 147 - 168 SSE NNW 0.34 0.29 0.59 4 169- 191 S N 0.34 0.29 0.59 5 192 - 213 SSW NNE 0.34 0.39 0.78 7 214- 236 SW NE 0.34 0.42 0.58' 11 237 - 258 WSW ENE 0.34 0.52 0.49 7 259 - 281 W E 0.34 0.45 0.48 4 282 - 303 WNW ESE 0.34 0.18 0.50 3 304 - 326 NW SE 0.34 0.20 0.43 3 326 - 348 NNW SSE 0.34 0.20 0.41 5

• EPB distances established at Exclusion Area Boundary distance of 1800 ft.

EP-AD-00-124, Revision 21, Page 8 of 8

Tab 2 EP-PS-249-2 MIDAS OPERATING PROCEDURE TABLE OF CONTENTS SECTION PAGE A. INTRODUCTION/SYSTEM STARTUP 2 B. MENU B: FORWARD CALCULATIONS 4 C. MENU C: EVENT TREE NUREG-1228 CALCULATIONS 10 D. MENU D: DEFAULT ACCIDENT CALCULATIONS 14 E. MENU E-W: BACK CALCULATIONS 17 F. MENU G: BLOWOUT PANEL CALCULATIONS 23 G. DESCRIPTION OF INFORMATION PROVIDED ON THE MIDAS DOSE

SUMMARY

REPORT 29 H. INFORMATION FOR DISTANCES BETWEEN 10 AND 50 MILES 33 I. ACCIDENT DESCRIPTIONS 34 EP-AD-000-1 12, Revision 21, Page 1 of 40

Tab 2 EP-PS-249-2 A. INTRODUCTIONISYSTEM STARTUP

1. The following conventions are used in this procedure to describe computer operations:

a. Bold, upper case text (i.e., CURRENT DATE), denotes text which appears on the screen.

b. Underlined, uppercase text (i.e., LOGIN) denotes text to be typed.

c. Bracketed, upper-case text (i.e., [ENTER]), denotes special keys which are to be pressed.

d. Most mouse selections can be made with a single click.

• Single click RESET to cancel previous screen selections.

• Double click RESET to back out of present menu.

• Double click to EXIT menu.

2. The met and vent spreadsheet will appear with all of the meteorological and ventilation release rate parameters across the top of the page. The current time period is highlighted in the left-hand column. The first time interval is 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> before the current time and the last time interval is 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> after the current time.

3. All required meteorological and ventilation data for MIDAS can be obtained using the METNENT DATA ACQUISITION OPTIONS tab.

4. To start MIDAS on a DOS computer.

a. Tum ON each component (monitor, computer, and printer) of the computer system on which MIDAS is loaded.

b. At the MIDAS logon screen, enter the password MIDAS and [ENTER].

c. At the MIDAS MAIN MENU screen, select A MIDAS (Dose Calculator) and [ENTER].

d. The system will then display the CURRENT DATE. If the date is correct, press [ENTER]. If this date is incorrect, type the correct date using the format which is illustrated in the prompt and press [ENTER].

e. The system will then display the CURRENT TIME, which is stored in the computer system's clock (24-hour clock format). If the time is correct, press [ENTER]. If this time is incorrect, type the correct time using the format which is illustrated in the prompt and press [ENTER].

EP-AD-000-1 12, Revision 21, Page 2 of 40

Tab 2 EP-PS-249-2

f. The MIDAS logon screen will now appear for 20 seconds.

g. The ACCIDENT MENU SELECTION screen will appear. Select the appropriate calculation option and CONFIRM your selection.

5. To exit MIDAS on a DOS computer, double-click EXIT on each menu screen that appears. At the SECURITY MENU, press [F8] to log off.

6. To start MIDAS on a Windows computer:

a. Turn on each component (monitor, computer, and printer) of the computer system on which MIDAS is loaded.

b. At the WINDOWS LOGIN Screen, press [CANCEL].

c. On the System Desktop, double click on the MIDAS Icon.

d. The system will then display the CURRENT DATE. If the date is correct, press [ENTER]. If the date is incorrect, type the correct date using the format which is illustrated in the prompt and press [ENTER].

e. The system will then display the CURRENT TIME, which is stored in the computer system's clock (24-hour clock format). If the date is correct, press [ENTER]. If the date is incorrect, type the correct time using the format which is illustrated in the prompt and press [ENTER].

f. The MIDAS logon screen will now appear for a short time.

9. The ACCIDENT MENU SELECTION screen will appear. Select the appropriate calculation option and CONFIRM your selection.

7. To exit MIDAS on a Windows computer, double-dock EXIT on each menu screen that appears until you return to the System Desktop.

a. On the System Desktop, select START, SHUTDOWN, SHUTDOWN THE COMPUTER, and press [YES].

EP-AD-000-1 12, Revision 21, Page 3 of 40

Tab 2 EP-PS-249-2 B. MENU B: FORWARD CALCULATIONS REQUIRED INPUTS ENGINEERING OR OPERATIONS SUPPORT IS REQUESTED FOR THESE CALCULATIONS.

PLANT CONDITIONS

• TIME OF REACTOR SHUTDOWN

• RELEASE START TIME DURATION OF RELEASE PROJECTION TIME ACCIDENT SOURCE TERM SELECTION MET DATA

• 10 M WIND SPEED

• 10 M WIND DIRECTION STABILITY CLASS

• PRECIPITATION RATE VENT DATA SITE TOTAL NOBLE GAS RELEASE RATES SITE TOTAL 1-131 RELEASE RATES (if available from Chemistry or as directed by RPC/DASU)

SITE TOTAL PARTICULATE RELEASE RATES (if available from Chemistry or as directed by RPC/DASU)

1. The MET/VENT DATA CONTROL TABLE screen will appear.

a. Select START NEW SCENARIO and then CONFIRM, OR

b. If you have already initiated calculations and wish to modify either the existing met spreadsheet file or vent spreadsheet, select CURRENT SCENARIO EDIT and CONFIRM.

NOTE: CURRENT SCENARIO EDIT will include releases/doses from previous time steps, if applicable.

c. Other options are available in the lower right hand section of the display if you wish to RESET or change your initial selection or EXIT the screen.

EP-AD-000-1 12, Revision 21, Page 4 of 40

Tab 2 EP-PS-249-2

2. The METEOROLOGICAL DATA spreadsheet will appear with all of the required meteorological parameters across the top of the page. Place the cursor on the data period corresponding to the start of release. Input the following met data:

NOTE 1: If the met data remains the same for successive time periods, the operator need only enter the met data once. MIDAS will persist the data to future time periods automatically.

NOTE 2: If a value is to be repeated in a field it can still be manually copied down the spreadsheet using the K (copy last) key while that value is highlighted.

a. In the column labeled 1M SPD, enter the wind speed from the 10 meter onsite (primary) meteorological tower in MILES PER HOUR (MPH).

NOTE: If the primary meteorological tower-data is not available, refer to the Met Vent Data Acquisition Options tab for other options.

If the primary meteorological tower wind speed remains at "zero" during freezing and/or other inclement weather, that data point is likely invalid, and the backup tower wind speed should be used if available.

b. In the column labeled 10M WD, enter the wind direction from the 10-meter onsite (primary) meteorological tower in DEGREES FROM (DEG FM).

c. In the column labeled STAB CLS, enter the actual value forAT in DEGREES CENTIGRADE (preferred method) or the wind speed corrected stability class (Letter Code) if the primary tower data is not available. MIDAS will convert the letter entry to a numerical value.

d. In the column labeled RAIN-LMH, enter the precipitation rate in INCHES PER 15 MINUTES (IN15M). Divide the PICSY precipitation rate (incheslhr) by 4. If the precipitation rate is not available, estimation may be made by using the following table:

NO PRECIPITATION 2(zero)

DRIZZLE or MIST LIGHT STEADY RAIN MEDIUM HEAVY DOWNPOUR HEAVY

e. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

EP-AD-000-1 12, Revision 21, Page 5 of 40

Tab 2 EP-PS-249-2

3. A WEATHER SELECTION screen will appear if any of the meteorological data inputs are missing from the spreadsheet

a. If this screen appears, select RESET until you have returned to the METIVENT DATA CONTROL TABLE screen.

b. Select CURRENT SCENARIO EDIT and enter any missing meteorological values on the spreadsheet.

c. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

4. The vent (GASEOUS VENT AND FLOW) spreadsheet will appear next. Enter current vent data. The data entry for each 15-minute period is as follows:

NOTE: Vent data may be entered in a regular numerical presentation (10000) or in scientific notation (1.OE+04).

a. In the column labeled TOT NG RELEASE, enter the site total noble gas release rate in gCi/min.

b. In the column labeled TOT 1-131 RELEASE, enter the site total 1-131 release rate in iCi/min. Unless valid data is available from Chemistry or data is authorized for use by the RPC/DASU, the 1-131 release rate should be calculated as follows:

TOT NG RELEASE (CVmin)/1000 = TOT 1-131 RELEASE (Ci/min)

c. In the column labeled TOT P RELEASE, enter the site total particulate release rate in gCi/min. Unless valid data is available from Chemistry or data is authorized for use by the RPCIDASU, the particulate release rate should be calculated as follows:

TOT NG RELEASE (Cimin)/10,000 = TOT P RELEASE (Ci/min)

d. When the data entry is complete, press the X key to save the information and exit the spreadsheet.

EP-AD-000-1 12, Revision 21, Page 6 of 40

Tab 2 EP-PS-249-2

5. From the ACCIDENT SOURCE TERM SELECTION screen, select an appropriate accident source term, then CONFIRM. Select RESET if you wish to change your previous selection.

If no specific information on the type of release is available from Engineering, use the following as a guide in the selection of appropriate accident source term.

a. Obtain Reactor Power from Engineering, Operations, or as follows:

1) From PICSY, select Unit #1 or Unit #2 formats to view affected unit.

2) Type STA and press [ENTER].

3) 'Reactor Power" is in the top left section.

4) Click on MET VENT to return to the MetNent data display.

b. If the reactor is operating at or greater than 10% power, select the ATWS source term.

c. If reactor power is at less than 10%, select the LOCA (Clad Failure) source term.

d. If conditions indicate a fuel handling incident and a release from the refueling floor (Reactor Building floor 818'), select Fuel.Handling Accident.

6. The RELEASE TIMING SELECTION screen will appear next. There are three lines to the screen.

a. On Line 1, select TRIP DATE (date and time of reactor trip). Using the calendar wheel, enter the appropriate date and time of reactor trip.

CONFIRM to close the calendar wheel.

1) The time of reactor trip must be equal to or earlier than the START OF RELEASE.

2) The time of reactor trip can be set up to roughly one year (8,190 hours0.0022 days <br />0.0528 hours <br />3.141534e-4 weeks <br />7.2295e-5 months <br />) prior to the START OF RELEASE.

EP-AD-000-1 12, Revision 21, Page 7 of 40

Tab 2 EP-PS-249-2 NOTE (1): MIDAS assumes the reactor must be shutdown before a release can occur. The TRIP DATE triggers the start of decay for the accident mix.

NOTE (2): Even during an ATWS, where a release is in progress and the reactor has not shut down, a TRIP DATE must be entered to run MIDAS. It is recommended the same date and time for the START OF RELEASE be used for the TRIP DATE. Entering a date and time for reactor trip has no impact on decay of the ATWS mix.

b. On Line 2, select START OF RELEASE. Using the calendar wheel, enter the appropriate date and time of the start of release. CONFIRM to close the calendar wheel.

1) If START NEW SCENARIO was selected-4he START OF RELEASE dateltime entered should be the current dateltime at which you are starting the calculation.

2) If CURRENT SCENARIO EDIT was selected, the previously entered START OF RELEASE should still be used, if met/vent date have been entered for each 15-minute period since that START OF RELEASE. Otherwise, select RESET until START NEW SCENARIO is selected.

NOTE: The START OF RELEASE is defined as the date and time of the first vent data entry.

c. On Line 3, select REMAINING DURATION of the release. Using the numpad enter the duration of release, in minutes, and select EN or press

[ENTER] to close the numpad. If the duration of release is not known, use the default of 360 minutes.

NOTE: The REMAINING DURATION (DURATION OF RELEASE) can use forecasted or persisted data for up to 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> into the future.

d. Select CONFIRM to continue with the calculation or RESET to change any of your previous choices.

EP-AD-000-1 12, Revision 21, Page 8 of 40

Tab 2 EP-PS-249-2

7. The PPL

SUMMARY

DATA SELECTION screen allows the user to select different options for the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET.

a. Select the projection time from the left-hand column if other than the default of six hours is needed.

NOTE: The 0.25-hour projection time should be used with extreme caution. Projected doses can be substantially underestimated.

b. Select the PEAK SECTOR dose rate option; then CONFIRM. If you wish to change any of your previous choices, select RESET.

NOTE: The PEAK SECTOR is used to determine the highest dose rate in all 16 sectors. The alternate selection (CURRENT AFFECTED SECTOR) is applicable-only when estimated dose rates from the current release period alone are requested by the RPCIDASU.

8. After the calculations have completed, the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET will be displayed on the screen.

a. If you want to select a different projection time or sector. designation from the PPL

SUMMARY

DATA SELECTION screen, select RESTART REPORT.

b. If you wish to view additional report options, select CONTINUE and, on the next page, MORE REPORTS.

c. If you wish to continue with the next calculation, double click EXIT. This will return you to the ACCIDENT MENU SELECTION screen where the dose calculation process can be repeated using updated input values.

d. If a hard copy is desired of any printout or plot displayed on the screen, press [PRINT SCRNJ.

NOTE: If a hard-copy printout is made of the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET, be sure to fill in the required information documenting the name of the dose calculator and approver.

EP-AD-000-1 12, Revision 21, Page 9 of 40

Tab 2 EP-PS-249-2 C. MENU C: EVENT TREE NUREG-1228 CALCULATIONS REQUIRED INPUTS ENGINEERING OR OPERATIONS SUPPORT IS REQUESTED FOR THESE CALCULATIONS.

PLANT CONDITIONS

• RELEASE PATHWAY

• CORE CONDITION, INCLUDING PERCENT OF CLAD FAILURE OR FUEL MELT

• CONTAINMENT CONDITIONS

• FILTRATION

• PROJECTION TIME MET DATA

• 10 M WIND SPEED

• 10 M WIND DIRECTION

• STABILITY CLASS

• PRECIPITATION RATE

1. The EVENT TREE NUREG-1228 SELECTION screen will appear.

a. Using information provided by Engineering Support or Operations, select one cell in each row of the menu. When a cell in the current row is selected, the next row then appears.

NOTE: Event tree menu selections, which include a definition of plant release parameters, are included (Section I) for each NUREG-1228 accident release scenario.

b. Using information provided by Engineering Support, select percent clad failure or percent fuel melt as follows:

(1) Left-click on percent clad failure (fuel melt).

(2) Using the numpad on the screen, input the percent clad failure (fuel melt) provided by Engineering Support, the EN (ENTER).

(3) CONFIRM your entry if correct. If incorrect, re-perform steps (1) and (2).

c. CONFIRM entries to continue with the calculation or RESET if you wish to change any of your selections. You may also double-click EXIT to return to the ACCIDENT MENU SELECTION screen.

EP-AD-000-1 12, Revision 21, Page 10 of 40

Tab 2 EP-PS-249-2

2. The METNENT DATA CONTROL TABLE screen will appear.

a. Select START NEW SCENARIO and then CONFIRM.

b. Other options are available in the lower right hand section of the display if you wish to RESET your initial entries or EXIT the screen.

3. The METEOROLOGICAL DATA spreadsheet will appear with all of the required meteorological parameters across the top of the page.

NOTE: Ensure met data is entered for the current time. MIDAS will persist the data to future time periods automatically.

a. In the column labeled IOM SPD, enter the wind speed from the 10-meter onsite (primary) meteorological tower in MILES PER HOUR (MPH).

NOTE: If the primary meteorological tower data is not available, refer to the Met Vent Data Acquisition Options tab for other options.

If the primary meteorological tower wind speed remains at

'zero during freezing and/or other inclement weather, that data point is likely invalid, and the backup tower wind speed should be used if available.

b. In the column labeled IOM WD, enter the wind direction from the 10-meter onsite (primary) meteorological tower in DEGREES FROM (DEG FM).

c. In the column labeled STAB CLS, enter the actual value for AT in DEGREES CENTIGRADE (preferred method) or the wind speed corrected stability class (Letter Code) if the primary tower data is not available. MIDAS will convert the letter entry to a numerical value.

d. In the column labeled RAIN-LMH, enter the precipitation rate in INCHES PER 15 MINUTES (INI15M). Divide the PICSY precipitation rate (inches/hr) by 4. If the precipitation rate is not available, estimation may be made by using the following table:

NO PRECIPITATION O(zero)

DRIZZLE or MIST LIGHT STEADY RAIN MEDIUM HEAVY DOWNPOUR jEAVY EP-AD-000-1 12, Revision 21, Page 11 of 40

Tab 2 EP-PS-249-2

e. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

4. A WEATHER SELECTION screen will appear if any of the meteorological data inputs are missing from the spreadsheet.

a. If this screen appears, select RESET until you have returned to the METNENT DATA CONTROL TABLE screen.

b. Select CURRENT SCENARIO EDIT and enter any missing meteorological values on the spreadsheet.

c. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

5. The PPL

SUMMARY

DATA SELECTION screen allows the user to select different options for the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET.

a. Select the projection time from the left-hand column if other than the default of six hours is needed.

NOTE: The 1-hour projection time should be used with caution.

Projected doses can be underestimated.

b. Select the PEAK SECTOR dose rate option; then CONFIRM. If you wish to change any of your previous choices, select RESET.

NOTE: The PEAK SECTOR is used to determine the highest dose rate in all 16 sectors. The alternate selection (CURRENT AFFECTED SECTOR) is applicable only when estimated dose rates from the current release period alone are requested by the RPCIDASU.

6. After the calculations have completed, the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET will be displayed on the screen.

a. If you want to select a different projection time or sector designation from the PPL

SUMMARY

DATA SELECTION screen, select RESTART PROGRAM.

b. If you wish to view additional report options, select CONTINUE and, on the next page, MORE REPORTS.

c. If you wish to continue with the next calculation, double click EXIT. This will return you to the ACCIDENT MENU SELECTION screen where the dose calculation process can be repeated using updated input values.

EP-AD-000-1 12, Revision 21, Page 12 of 40

Tab 2 EP-PS-249-2

d. If a hard copy is desired of any printout or plot displayed on the screen, press [PRINT SCRN].

NOTE (1): If a hard-copy printout is made of the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET, be sure to fill in the required information documenting the name of the dose calculator and approver.

NOTE (2): Engineering Support or Operations concurrence with the selections may be documented by their representatives' signatures on the printout.

EP-AD-000-1 12, Revision 21, Page 13 of 40

Tab 2 EP-PS-249-2 D. MENU D: DEFAULT ACCIDENT CALCULATIONS REQUIRED INPUTS ENGINEERING OR OPERATIONS SUPPORT IS REQUESTED FOR THESE CALCULATIONS.

MET DATA

• 10 M WIND SPEED

• 10 M WIND DIRECTION

• STABILITY CLASS

• PRECIPITATION RATE SOURCE TERM

• ACCIDENT SOURCE TERM SELECTION

• PERCENT OF CLAD FAILURE OR FUEL MELT

• PROJECTION TIME

1. The METVENT DATA CONTROL TABLE screen will appear.

a. Select START NEW SCENARIO and then CONFIRM.

b. Other options are available in the lower right hand section of the display if you wish to RESET your initial entries or EXIT the.screen.

2. The METEOROLOGICAL DATA spreadsheet will appear with all of the required meteorological parameters across the top of the page.

NOTE: Ensure met data is entered for the current time. MIDAS will persist the data to future time periods automatically.

a. In the column labeled 10M SPD, enter the wind speed from the 10-meter onsite (primary) meteorological tower in MILES PER HOUR (MPH).

NOTE: If the primary meteorological tower data is not available, refer to the Met Vent Data Acquisition Options tab for other options.

If the primary meteorological tower wind speed remains at "zero" during freezing and/or other inclement weather, that data point is likely invalid, and the backup tower wind speed should be used if available.

EP-AD-000-1 12, Revision 21, Page 14 of 40

Tab2 EP-PS-249-2

b. In the column labeled 1M WD, enter the wind direction from the 10-meter onsite (primary) meteorological tower in DEGREES FROM (DEG FM).

c. In the column labeled STAB CLS, enter the actual value for AT in DEGREES CENTIGRADE (preferred method) or the wind speed corrected stability class (Letter Code) if the primary tower data is not available. MIDAS will convert the letter entry to a numerical value.

d. In the column labeled RAIN-LMH, enter the precipitation rate in INCHES PER 15 MINUTES (IN15M). Divide the PICSY precipitation rate (inches/hr) by 4. If the precipitation rate is not available, estimation may be made by using the following table:

NO PRECIPITATION g(zero)

DRIZZLE or MIST LIGHT STEADY RAIN MEDIUM HEAVY DOWNPOUR IHEAVY

e. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

3. A WEATHER SELECTION screen will appear if any of the meteorological data inputs are missing from the spreadsheet.

a. If this screen appears, select RESET until you have returned to the METIVENT DATA CONTROL TABLE screen.

b. Select CURRENT SCENARIO EDIT and enter any missing meteorological values on the spreadsheet.

c. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

4. From the ACCIDENT SOURCE TERM SELECTION screen, select an appropriate accident source term, then CONFIRM.

5. A PERCENT FAILURE FOR LOCA screen will appear if the clad failure or fuel melt accident source term is selected. Input the percent of clad failure or fuel melt using the numpad and CONFIRM.

EP-AD-000-1 12, Revision 21, Page 15 of 40

Tab 2 EP-PS-249-2

6. The PPL

SUMMARY

DATA SELECTION screen allows the user to select different options for the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET.

a. Select the projection time from the left-hand column if other than the default of six hours is needed.

NOTE: The 1-hour projection time should be used with caution.

Projected doses can be underestimated.

b. Select the PEAK SECTOR dose rate option; then CONFIRM. If you wish to change any of your previous choices, select RESET.

NOTE: The PEAK SECTOR is used to determine the-highest dose rate in all 16 sectors. The alternate selection (CURRENT AFFECTED SECTOR) is applicable only when estimated dose rates from the current release-period alone are requested by the RPC/DASU.

7. After the calculations have completed, the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET will be displayed on the screen.

a. If you want to select a different projection time or sector designation from the PPL

SUMMARY

DATA SELECTION screen, select RESTART PROGRAM.

b. If you wish to view additional report options, select CONTINUE and, on the next page, MORE REPORTS.

c. If you wish to continue with the next calculation, double click EXIT. This will return you to the ACCIDENT MENU SELECTION screen where the dose calculation process can be repeated using updated input values.

d. If a hard copy is desired of any printout or plot displayed on the screen, press [PRINT SCRN].

NOTE: If a hard-copy printout is made of the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET, be sure to fill in the required information documenting the name of the dose calculator and approver.

EP-AD-000-1 12, Revision 21, Page 16 of 40

Tab 2 EP-PS-249-2 E. MENU E-W: BACK CALCULATIONS REQUIRED INPUTS ENGINEERING OR OPERATIONS SUPPORT IS REQUESTED FOR THESE CALCULATIONS.

PLANT CONDITIONS

• TIME OF REACTOR SHUTDOWN

• RELEASE START TIME

• DURATION OF RELEASE

• ACCIDENT SOURCE TERM SELECTION

• PROJECTION TIME MET DATA

• 10 M WIND SPEED

• 10 MWIND DIRECTION

• STABILITY CLASS PRECIPITATION RATE FIELD DATA

• 3 FT (CW) SURVEY METER READING

• DISTANCE FROM PLANT IODINE CARTRIDGE NET CPM, IODINE CONCENTRATION PlCi/cc, OR DEFAULT IODINE MIX

1. The MET/VENT DATA CONTROL TABLE screen will appear.

a. Select START NEW SCENARIO and then CONFIRM.

b. If you have already initiated calculations and wish to modify the existing met spreadsheet file, select CURRENT SCENARIO EDIT and CONFIRM.

c. Other options are available in the lower right hand section of the display if you wish to RESET your initial entries or EXIT the screen.

EP-AD-000-1 12, Revision 21, Page 17 of 40

Tab 2 EP-PS-249-2

2. The METEOROLOGICAL DATA spreadsheet will appear with all of the required meteorological parameters across the top of the page.

NOTE: Ensure met data is entered for the current time. MIDAS will persist the data to future time periods automatically.

a. In the column labeled I OM SPD, enter the wind speed from the 10-meter onsite (primary) meteorological tower in MILES PER HOUR (MPH).

NOTE: If the primary meteorological tower data is not available, refer to the Met Vent Data Acquisition Options tab for other options.

If the primary meteorological tower wind speed remains at "zero" during freezing and/or other inclement weather, that data point is likely invalid, and the backup tower wind speed should be used if available.

b. In the column labeled 1OM WD, enter the wind direction from the 10-meter onsite (primary) meteorological tower in DEGREES FROM (DEG FM).

c. In the column labeled STAB CLS, enter the actual value for AT in DEGREES CENTIGRADE (preferred method) or the wind speed corrected stability class (Letter Code) if the primary tower data is not available. MIDAS will convert the letter entry to a numerical value.

d. In the column labeled RAIN-LMH, enter the precipitation rate in INCHES PER 15 MINUTES (IN/15M). Divide the PICSY precipitation rate (inches/hr) by 4. If the precipitation rate is not available, estimation may be made by using the following table:

NO PRECIPITATION 2(zero)

DRIZZLE or MIST LIGHT STEADY RAIN MEDIUM HEAVY DOWNPOUR HEAW

e. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

EP-AD-00-1 12, Revision 21, Page 18 of 40

Tab 2 EP-PS-249-2

3. A WEATHER SELECTION screen will appear if any of the meteorological data inputs are missing from the spreadsheet.

a. If this screen appears, select RESET until you have returned to the MET/VENT DATA CONTROL TABLE screen.

b. Select CURRENT SCENARIO EDIT and enter any missing meteorological values on the spreadsheet.

c. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

4. From the ACCIDENT SOURCE TERM SELECTION screen, select an appropriate accident source term, then CONFIRM.

If no specific information on the type of release is available from Engineering, use the following as a guide in the selection of an appropriate accident source term:

a. Obtain Reactor Power from Engineering, Operations, or as follows:

1) From PICSY, select Unit #1 or Unit #2 formats to view affected unit.

2) Type STA and press [ENTER).

3) "Reactor Power" is in the top left section.

4) Click on MET VENT to return to the Met/ent data display.

b. If the reactor is operating at or greater than 10% power, select the ATWS source term.

c. If reactor power is at less than 10%, select the LOCA (Clad Failure) source term.

d. If conditions indicate a fuel handling incident and a release from the refueling floor (Reactor Building floor 818'), select Fuel Handling Accident.

EP-AD-000-1 12, Revision 21, Page 19 of 40

Tab 2 EP-PS-249-2

5. The next screen is the FIELD MONITOR PARAMETER SELECTION screen.

Select the appropriate cells and input the information requested using the numpad on the screen or enter the data using the computer keyboard. Once the data entry is complete, CONFIRM to continue with the calculation.

a. Enter Field Team or ERMS Fixed Monitor gamma (EDE) dose rate whichever is appropriate.

b. Enter the distance of the Field Team or Fixed Monitor from the plant as noted on the RMS Report or for the on-site team as noted on Table 4 of EP-AD-000-1 24.

c. If iodine air sample data is available, enter either the IODINE CARTRIDGE reading in net counts per minute or an IODINE CONCENTRATION value in IgCi/cc. A zero (0) value may be entered for the net count per minute or j+/-Ci/cc measurement,-f indicated.

d. If iodine data is not available, select the DEFAULT MIX option to characterize the iodine source term.

6. On the RELEASE TIMING SELECTION screen, enter the estimated remaining duration for the release, then CONFIRM. If the duration of release is not known, use the default of 360 minutes.

7. The PPL

SUMMARY

DATA SELECTION screen allows the user to select different options for the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET.

a. Select the projection time from the left-hand column-if other than the default of six hours is needed.

NOTE: The 1-hour projection time should be used with caution.

- Projected doses can be underestimated.

b. Select the PEAK SECTOR dose rate option; then CONFIRM. If you wish to change any of your previous choices, select RESET.

NOTE: The PEAK SECTOR is used to determine the highest dose rate in all 16 sectors. The alternate selection (CURRENT AFFECTED SECTOR) is applicable only when estimated dose rates from the current release period alone are requested by the RPC/DASU.

EP-AD-000-1 12, Revision 21, Page 20 of 40

Tab 2 EP-PS-249-2

8. After the calculations have completed, the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET will be displayed on the screen.

a. If you want to select a different projection time or sector designation from the PPL

SUMMARY

DATA SELECTION screen, select RESTART PROGRAM.

b. If you wish to view additional report options, select CONTINUE and, on the next page, MORE REPORTS.

c. If you wish to continue with the next calculation, double click EXIT. This will return you to the ACCIDENT MENU SELECTION screen where the dose calculation process can be repeated using updated input values.

d. If a hard copy is desired of any printout or plot displayed on the screen, press [PRINT SCRN].

NOTE: If a hard-copy printout is made of the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET, be sure to fill in the required information documenting the name of the dose calculator and approver.

e. Remote Monitoring System perimeter monitoring location dose rates can be displayed by MIDAS using the perimeter monitoring dose rate screen option.

NOTE: The displayed values are only numeric dose estimates based on MIDAS calculations. They are not real-timen readings from the perimeter monitor system.

Directions for accessing the MIDAS perimeter monitor dose rate screen option are as follows:

1) At the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET screen, select CONTINUE.

2) On the next screen select MORE REPORTS.

3) From the MORE REPORTS SELECTION screen, select FM GAMMA DOSE RATE PLOT and CONFIRM.

4) From the REPORT PARAMETER SELECTION screen, choose the appropriate projection time and CONFIRM.

5) From the MAP SELECTION screen, select MAP SCALE and input 1.25 miles, then CONFIRM.

EP-AD-000-1 12, Revision 21, Page 21 of 40

Tab 2 EP-PS-249-2

6) On the next screen, select MAP FEATURES.

7) On the next screen, select CALCULATED PERIMETER MON DOSE RATES and CONFIRM.

8) To exit, select CONTINUE, MORE REPORTS, and EXIT.

EP-AD-000-1 12, Revision 21, Page 22 of 40

Tab 2 EP-PS-249-2 F. MENU G: BLOWOUT PANEL CALCULATIONS REQUIRED INPUTS ENGINEERING OR OPERATIONS SUPPORT IS REQUESTED FOR THESE CALCULATIONS.

PLANT CONDITIONS

• TIME OF REACTOR SHUTDOWN RELEASE START TIME PROJECTION TIME

• BLOWOUT PANEL ASSUMED TO HAVE LIFTED (RELEASE PATHWAY)

• CORE CONDITION, INCLUDING PERCENT OF CLAD FAILURE OR CORE MELT MET DATA 10 M WIND SPEED 10 M WIND DIRECTION

• STABILITY CLASS

• PRECIPITATION RATE

1. The METNENT DATA CONTROL TABLE screen will appear.

a. Select START NEW SCENARIO and then CONFIRM, OR

b. If you have already initiated calculations and wish to modify the existing met spreadsheet file, select CURRENT SCENARIO EDIT and CONFIRM.

NOTE: CURRENT SCENARIO EDIT will include releases/doses from previous time steps, if applicable.

c. Other options are available in the lower right hand section of the display if you wish to RESET or change your initial selection or EXIT the screen.

EP-AD-00-112, Revision 21, Page 23 of 40

Tab 2 EP-PS-249-2

2. The METEOROLOGICAL DATA spreadsheet will appear with all of the required meteorological parameters across the top of the page. Place the cursor on the data period corresponding to the start of release. Input the following met data:

NOTE 1: If the met data remains the same for successive time periods, the operator need only enter the met data once. MIDAS will persist the data to future time periods automatically.

NOTE 2: If a value is to be repeated in a field it can still be manually copied down the spreadsheet using the K (copy last) key while that value is highlighted.

a. Inthe column labeled 1M SPD, enter the wind speed from the 10 meter onsite (primary) meteorological tower in MILES PER HOUR (MPH).

NOTE: If the primary meteorological towerdata is not available, refer to the Met Vent Data Acquisition Options tab for other options.

If the primary meteorological tower wind speed remains at "zero" during freezing and/or other inclement weather, that data point is likely invalid, and the backup tower wind speed should be used if available.

b. Inthe column labeled 1GM WD, enter the wind direction from the 10-meter onsite (primary) meteorological tower in DEGREES FROM (DEG FM).

c. Inthe column labeled STAB CLS, enter the actual value for AT in DEGREES CENTIGRADE (preferred method) or the wind speed corrected stability class (Letter Code) if the primary tower data is not available. MIDAS will convert the letter entry to a numerical value.

d. In the column labeled RAIN-LMH, enter the precipitation rate in INCHES PER 15 MINUTES (IN/15M). Divide the PICSY precipitation rate (incheslhr) by 4. If the precipitation rate is not available, estimation may be made by using the following table:

NO PRECIPITATION 2(zero)

DRIZZLE or MIST LIGHT STEADY RAIN MEDIUM HEAVY DOWNPOUR IHEAVY

e. Type X when all data has been entered to save the data and exit out of the meteorological spreadsheet.

EP-AD-000-1 12, Revision 21, Page 24 of 40

Tab 2 EP-PS-249-2

3. The BLOWOUT PANEL SELECTION screen will appear.

NOTE: Blowout panel locations are shown on Figure 1 of this procedure tab.

a. Using information provided by Engineering Support or Operations, select one cell in each row of the menu. When a cell in the current row is selected, the next row then appears.

b. CONFIRM entries to continue with the calculation or RESET if you wish to change any of your selections. You may also double-click EXIT to return to the ACCIDENT MENU SELECTION screen.

c. On the PERCENT CLAD FAILURE (or PERCENT FUEL MELT) screen, using information provided by Engineering Support, select percent clad failure or percent fuel melt as follows:

(1) Left-click on percent clad failure (fuel melt).

(2) Using the numpad on the screen, input the percent clad failure (fuel melt) provided by Engineering Support, then EN (ENTER).

(3) CONFIRM your entry if correct. If incorrect, re-perform steps (1) and (2).

NOTE: Release rates used by MIDAS are those shown in Table 1 of this procedure tab, multiplied by the percent clad failure (fuel melt).entered, expressed as a fraction (e.g., the multiplier for 50% fuel melt would be 0.5).

4. A WEATHER SELECTION screen will appear if any of the meteorological data inputs are missing from the spreadsheet.

a. Missing information will be indicated by a black box (with white lettering) in the left-hand column.

(1) Left-click on the black box in the left column.

(2) Using the numpad on the screen, input the response to the missing data.

(3) Repeat steps () and (2) to supply any other required information.

(4) CONFIRM your entry if correct. If incorrect, re-perform steps (1) and (2) for the data in error.

EP-AD-000-1 12, Revision 21, Page 25 of 40

Tab 2 EP-PS-249-2

5. The PPL

SUMMARY

DATA SELECTION screen allows the user to select different options for the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET.

a. Select the projection time from the left-hand column if other than the default of six hours is needed.

NOTE: The 0.25-hour projection time should be used with extreme caution. Projected doses can be substantially underestimated.

b. Select the PEAK SECTOR dose rate option; then CONFIRM. If you wish to change any of your previous choices, select RESET.

NOTE: The PEAK SECTOR is used to determine the highest dose rate in all 16 sectors. The alternate selection (CURRENT AFFECTED SECTOR) is applicabi only when estimated dose rates from the current release period alone are requested by the RPCIDASU.

6. After the calculations have completed, the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET will be displayed on the screen.

a. If you want to select a different projection time or sector designation from the PPL

SUMMARY

DATA SELECTION screen, select RESTART PROGRAM.

b. If you wish to view additional report options, select CONTINUE and, on the next page, MORE REPORTS.

c. If you wish to continue with the next calculation, double click EXIT. This will return you to the ACCIDENT MENU SELECTION screen where the dose calculation process can be repeated using updated input values.

d. If a hard copy is desired of any printout or plot displayed on the screen, press PRINT SCRN].

NOTE: If a hard-copy printout is made of the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET, be sure to fill in the required information documenting the name of the dose calculator and approver.

EP-AD-000-1 12, Revision 21, Page 26 of 40

Tab 2 EP-PS-249-2 FIGURE 1 EP-AD-000-1 12, Revision 21, Page 27 of 40

Tab 2 EP-PS-249-2 TABLE I EVALUATION OF UNMONITORED RELEASES FROM STATION BLOWOUT PANELS DIRECTIONS

1. Select the appropriate station blowout panel location.

2. Select an appropriate accident source term mix.

3. Use the corresponding design base release rates for input into MENU B.

4. Enter the release rates for one (1) fifteen-minute time period.

NOTE: If Clad Failure or Fuel Melt mixes are selected, multiply the site total noble gas, 1-131, and particulate release rates by the appropriate fraction of clad failure or fuel melt prior to entering the values onto the vent spreadsheet (e.g., the multiplier for 50% FUEL MELT would be 0.5).

[ I BLOWOUT PANEL LOCATION 3 DESIGN BASIS (SITE TOTAL) RELEASE RATES l NOBLE GAS 1-131 PARTICULATE RCIC PUMP ROOM (uCimin) (pCilmin) (pjCi/min)

[2 ACCIDENT SOURCE TERM Normal Reactor Coolant Activity 1.2E+02* 1.8E+02 1.IE+03 (LOCA) Reactor Depressurization-No FD 2.6E+06 8.4E+04 2.2E+04 (LOCA) 100% Clad Failure 2.1E+09 2.4E+08 9.1E+07 (LOCA) 100% Fuel Melt 4.3E+10 1.3E+09 1.7E+09 HPCI PUMP ROOM (tjCi~min) (pCVmin) (piCI/min) l Normal Reactor Coolant Activity 2.1 E+03* 3.2E+03 1.9E+04 (LOCA) Reactor Depressurization-No FD 4.6E+07 1.5E+06 3.8E+05 (LOCA) 100% Clad Failure 3.7E+10 4.3E+09 1.6E+09 (LOCA) 100% Fuel Melt 7.5E+1 2.3E+10 3.OE+10 HPCIVRCIC ROUTING AREA (PCI/min) l (pCimin) l (uCimin) j Normal Reactor Coolant Activity 3.2E+03* 4.9E+03 2.9E+04 j (LOCA) Reactor Depressurization-No FD 7.OE+07 2.2E+06 5.8E+05 (LOCA) 100% Clad Failure 5.7E+10 6.5E+09 2AE+09 (LOCA) 100% Fuel Melt -1.1E+12 3.5E+10 4.6E+10 RWCU PENETRATION ROOM I (Ci/min) (pCim) l lCmin) l Normal Reactor Coolant Activity 7.3E+03* 5.8E+03 6.6E+04 (LOCA) Reactor Depressurization-No FD 1.6E+08 l 2.6E+06 1.3E+06 (LOCA) 100% Clad Failure 1.3E+11 7.6E+09 5.5E+09 (LOCA) 100% Fuel Melt 2.6E+12 4.1E+10 1.0E+11 RB/TB MAIN STEAM TUNNEL (pC~min) (pCilmin) l (pC/mi)

Normal Reactor Coolant Activity 2.6E+04* 3.9E+04 l 2.3E+05 (LOCA) Reactor Depressurization-No FD 5.6E+08 1.8E+07 4.7E+06 (LOCA) 100% Clad Failure 4.6E+11 5.2E+10 1.9E+10 (LOCA) 100% Fuel Melt J 9.1E+12 2.8E+11 3.7E+11 FD = FUEL DAMAGE Value less than the TRM limit for noble gas release rate.

REFERENCE:

EC-RADN-1018, Evaluation of Unmonitored Releases from Station Blowout Panels, Revision 1, File R2-1.

EP-AD-000-1 12, Revision 21, Page 28 of 40

Tab 2 EP-PS-249-2 G. DESCRIPTION OF INFORMATION PROVIDED ON THE MIDAS DOSE ASSESSMENT

SUMMARY

SHEET

1. CALCULATION TYPE Menu option chosen for the calculation. Examples are Forward Calculation or Event Tree Calculation.

2. CURRENT TIME PERIOD Current meteorological time period used for dose projections provided on quarter hour increments to match met spreadsheet entries.

3. WEATHER CONDITIONS Meteorological data (wind speed, wind direction, affectedLsector, stability class, and precipitation rate) used for the summary report dose projections.

4. REACTOR SHUTDOWN TIME Date and time of reactor shutdown.

5. RELEASE START TIME This is the date and time of first dose calculation as indicated by the first positive vent release rate value entered on the vent data spreadsheet or if the vent spreadsheet is not used, the date and time of the calculation..

NOTE: For MENU C: EVENT TREE NUREG-1228 CALCULATIONS, MENU D: DEFAULT CALCULATIONS, and MENU E-W: BACK CALCULATIONS, it is conservatively assumed that the date and time of reactor shutdown is concurrent with the start of release.

6. PROJECTION TIME This is the time X hours into the future, starting from the beginning of the current meteorological time period. WXis the number of hours the user chooses as the projection time (e.g., 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />).

7. REMAINING DURATION This is the remaining duration of the release for the calculation type chosen. For Event Tree calculations, that is always 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and for Blowout Panel calculations, 0.25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />.

EP-AD-000-1 12, Revision 21, Page 29 of 40

Tab 2 EP-PS-249-2

8. SOURCE TERM (for Forward and Back Calculations)

Identifies the source term used for the current dose projection summary report calculations. Choice of six options:

ATWS-Normal Reactor Coolant Activity (UNDECAYED)

• Normal Reactor Coolant Activity (DECAYED)

• (LOCA) Coolant Activity Leak with Depressurization Spike-No Fuel Damage

• (LOCA) Cladding Failure-Gap Release

• (LOCA) Fuel Melt-Early In-Vessel Release

• Fuel Handling Accident

9. RELEASE CONDITIONS This section lists the release rates used in the calculation. The values are taken from user input for Forward calculations, inferred from user input of event conditions (Event Tree, Default, and Blowout Panel calculations, or inferred from user input of measured data in the field (Back calculations).

10. Content of this section varies by Calculation Type. The objective is to provide information about the assumptions used to infer the Release Conditions for the calculation or to provide additional information about the Release Conditions.

For Forward Calculations, isotopic release ratios are provided. These may be compared to default ratios and used to infer plant conditions, for example, status of filtration.

For Event Tree, Default, and Blowout Panel Calculations, event or default conditions are listed. From those conditions, Release Conditions are inferred.

For Back Calculations, measured field data are listed. From those data, Release Conditions are inferred.

11. DOSE RATE PROJECTIONS This table provides the TEDE, EDE, and THYROID CDE dose rates calculated at the OSCAR and EPB distances. These rate calculations are based on a variable projection/integration period for the current affected sector or peak sector (the usual user selection).

EP-AD-000-1 12, Revision 21, Page 30 of 40

Tab 2 EP-PS-249-2

12. INTEGRATED DOSE PROJECTIONS This table provides a TEDE and THYROID CDE dose projection calculated at the EPB, 2-mile, and 10-mile distances for varying projection times. The projection time will appear in the header line e.g., 4 HOUR INTEGRATED DOSE PROJECTION. The sector designation for this dose projection is based on the maximum calculated dose determined from all sixteen sectors for the given projection time (peak sector option, usually the user's choice) or the calculated dose for the current affected sector. Information for distances between 10 and 50 miles is available using the 'More Reports" feature.

13. PERFORMED/APPROVED The sign-off for calculation results is done for documentation purposes. The intended "approval" does not necessarily mean an independent verification of each input to the calculation but more an interactive discussion between the RPC/HP Level II Dose Calculator and/or DASU/DAST (or dose calculator) to ensure the calculated results are reasonable based on current plant and environmental information.

This sign-off process should occur before the calculated results are used for any emergency classification determinations or protective action recommendations.

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Tab 2 EP-PS-249-2 I ra ~~ ~ ~ ~ I S~ - ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~P 4P EP-AD-00O-1 12, Revision 21, Page 32 of 40

Tab 2 EP-PS-249-2 H. INFORMATION FOR DISTANCES BETWEEN 10 AND 50 MILES

1. From the MIDAS DOSE ASSESSMENT

SUMMARY

SHEET screen, select CONTINUE and, on the next page, MORE REPORTS.

2. Select TEDE 4-DAY DOSE REPORT or THYROID CDE DOSE REPORT, depending on which PAR guide has been exceeded at the 10-mile distance.

3. On the REPORT PARAMETER SELECTION screen, select PROJECTION TIME until the appropriate PROJECTION TIME (0.25,4, 6, or 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />) is displayed on the screen; then select CONFIRM.

NOTE: The 0.25-hour projection time should be used with extreme caution. Projected doses can be substantially underestimated.

4. The screen will now display projected doses at the EPB and at 2, 5,10, 25, and 50 miles. To obtain finer increments of distance, select CONTINUE until the desired range of distances is displayed.

NOTE: An objective is to determine the approximate distance from the plant at which dose projections are less than 1 rem TEDE and 5 rem THYROID CDE. A PAR is then likely to be issued to the next furthest 5-mile distance increment from the plant.

Example: A PAR for distances to 30 miles may be selected if projected doses become less than the PAG values (1 rem TEDE, 5 rem THYROID CDE) between 25 and 30 miles from the plant -

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Tab 2 EP-PS-249-2 ACCIDENT DESCRIPTIONS DEFAULT ACCIDENT DESCRIPTIONS (MENU B AND MENU D)

1. NORMAL REACTOR COOLANT ACTIVITY This accident scenario is defined as the release of reactor coolant system liquid and steam activity from the primary coolant system with no damage to the fuel and no activity spiking. The source term for this accident is normal reactor coolant system liquid and steam activity.

2. LOCA (RX DP-NO FD)

This accident scenario is defined as the release of reactor coolant system liquid and steam activity from the primary coolant system. Depiessurization of the primary coolant system is assumed, resulting in an activity spike in the reactor coolant. The source term for this accident is normal reactor coolant liquid and steam activity plus the depressurization activity spike. There is no fuel damage.

3. LOCA (CLAD FAILURE)

This accident scenario is defined as a Loss-of-Coolant Accident which results in damage to the reactor fuel cladding. The source term for this accident is'normal reactor coolant liquid and steam activity and a percentage of the activity in the fuel clad gap. For Menu D calculations, that percentage is entered as part of the calculation process. For Menu B calculations, the valid vent data entered define the severity of the event.

4. LOCA (FUEL MELT)

This accident scenario is defined as a Loss-of-Coolant Accident which results in damage to the reactor fuel. The source term for this accident is normal reactor coolant liquid and steam activity and a percentage of the activity in the reactor fuel. For Menu D calculations, that percentage is entered as part of the calculation process. For Menu B calculations, the valid vent data entered define the severity of the event.

5. FUEL HANDLING ACCIDENT This accident scenario is defined as a fuel handling accident which results in the release of spent fuel activity. The source term for this accident is spent fuel gap activity assuming a decay time after shutdown of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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Tab 2 EP-PS-249-2

6. ATWS This accident scenario is used for releases from a reactor unit continuing to operate at or greater than 10% power. The source term for this accident is normal reactor coolant system liquid and steam activity. The source term is undecayed; that is, no reactor trip is assumed to have occurred.

NOTE (1): For Menu D calculations, design basis assumptions are utilized.

For example, design basis leakage rates are assumed and iodine filtration efficiency of 99% is assumed in those pathways for which filters are in place.

NOTE (2): The source term for Menu D accident types is fixed. Release rate is calculated by MIDAS by dividing the total activity released by a predetermined release duration (6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> for all but fuel handling accidents, for which release duration is 2 heurs).

NUREG 1228 EVENT TREE ACCIDENT TYPES (MENU C)

1. LOCA - DRYWELL RELEASE This accident is a Loss-of-Coolant Accident with an activity release into the drywell which bypasses the suppression pool for which filtration of activity'by the Standby Gas Treatment System takes place before release to the environment.

2. LOCA - WETWELL RELEASE This accident is a Loss-of-Coolant Accident with an activity release through the suppression pool for which filtration of activity by the Standby Gas Treatment System takes place before release to the environment.

3. LOCA- CONTAINMENT BYPASS RELEASE This accident is a Loss-of-Coolant Accident with an activity release to the environment that bypasses the containment and the Standby Gas Treatment System.

4. ZIRCALLOY FIRE IN ONE THREE MONTH OLD BATCH This accident is a zircalloy fire in spent fuel that results in an activity release similar to a core melt. It assumes that the activity is filtered by the Standby Gas Treatment System prior to release.

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Tab 2 EP-PS-249-2

5. SPENT FUEL GAP RELEASE This accident is a release of fuel gap activity from the spent fuel pool with treatment by the Standby Gas Treatment System prior to release.

NOTE: Menu C (from NUREG-1228 Event Tree Analyses) is used to relatively quickly provide a bounding estimate of offsite dose, for situations where there are substantial uncertainties in prediction of source term and any resultant doses.

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Tab 2 EP-PS-249-2 NUREG 1228 MENU STRUCTURE FOR DRYWELL RELEASE CONTAINMENT DRYWELL WETWELL BYPASS SPENT FUEL RELEASE RELEASE RELEASE POOL RELEASE (Clad Failure) (Fuel Melt) (Fuel Melt) Core Condition GAP RELEASE IN-VESSEL VESSEL MELT UNCOVERED SEVERE THROUGH 15-30 MIN DAMAGE UNCOVERED

> 30 MIN

[ SPRAY ON

] SPRAY OFF

] Status of Drywell Containment Spray HOLDUP TIME HOLDUP TIME HOLDUP TIME Drywell Holdup Time:

<1 HOUR 2-12 HOURS 24 HOURS

- Time from Rerease CATASTROPHIC DELAYED (DEFAULT) RELEASE into Containment to CONTAINMENT Start of Release into FAILURE Environment(')

LEAK RATE LEAK RATE DESIGN DESIGN LEAK RATE 100%/DAY 100%/DAY LEAK RATE LEAK RATE 100%/HOUR UNFILTERED FILTERED UNFILTERED FILTERED Catastrophic Failure to Isolate Containment 1%/Day Containment Failure (1) HOLDUP TIME is defined as'drywell holdup time prior to release to the environment.

During this time period, credit is taken for drywell airborne activity removal due to plateout by natural processes and water sprays prior to release to the environment.

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Tab 2 EP-PS-249-2 NUREG 1228 MENU STRUCTURE FOR WETWELL RELEASE I DRYWELL RELEASE WETWELL RELEASE CONTAINMENT BYPASS SPENT FUEL POOL RELEASE RELEASE (Clad Failure) (Fuel Melt) (Fuel Melt) Core Condition GAP RELEASE IN-VESSEL VESSEL MELT UNCOVERED SEVERE THROUGH 15-30 MIN DAMAGE UNCOVERED

> 30 MIN

[ SATURATED I SUB-COOLED

] Conditions in Suppression Pool HOLDUP TIME HOLDUP TIME HOLDUP TIME Wetwell Holdup Time:

<1 HOUR 2-12 HOURS 24 HOURS Time from-Release CATASTROPHIC DELAYED (DEFAULT) RELEASE into Wetwell to Start CONTAINMENT FAILURE of Release into Environmene' LEAK RATE LEAK RATE DESIGN DESIGN LEAK RATE 100%/DAY 100%/DAY LEAK RATE LEAK RATE 100%/HOUR UNFILTERED FILTERED UNFILTERED FILTERED Catastrophic Failure to Isolate Containment 1%/Day Containment Failure (1) HOLDUP TIME is defined as wetwell holdup time prior to release to the environment During this time period, credit is taken for wetwell airborne activity removal due to plateout by natural processes and water sprays prior to release to the environment EP-AD-000-1 12, Revision 21, Page 38 of 40

l I Tab 2 EP-PS-249-2 NUREG 1228 MENU STRUCTURE FOR CONTAINMENT BYPASS RELEASE CONTAINMENT DRYWELL WETWELL BYPASS RELEASE RELEASE RELEASE (Clad Failure) (Fuel Melt) (Fuel Melt) Core Condition GAP RELEASE IN-VESSEL VESSEL MELT UNCOVERED SEVERE THROUGH 15-30 MIN DAMAGE UNCOVERED

> 30 MIN UNFILTERED I FILTERED Is Release Filtered?

RELEASE RATE RELEASE RATE TYPICAL DESIGN Release Rate, in 100%/HOUR 100%/DAY RELEASE RATE Terms of Percent of Core Inventory Catastrophic Failure to Isolate 1%/Day Containment Failure Containment EP-AD-000-1 12, Revision 21, Page 39 of 40

Tab 2 EP-PS-249-2 NUREG 1228 MENU STRUCTURE FOR SPENT FUEL POOL RELEASE CONTAINMENT WE1WELL SPENT FUEL RELEASE BYPASS POOL RELEASE RELEASE ZIRCALLOY FIRE GAP RELEASE GAP RELEASE Condition of Spent IN ONE 3 MONTH FROM ONE FROM 15 Fuel OLD BATCH 3 MONTH OLD BATCHES BATCH (TOTAL POOL)

SPRAY ON SPRAY OFF Status of Containment Spray (Default) into Pool HOLDUP TIME HOLDUP TIME Time from Release

<1 HOUR 2-12 HOURS from Fuel to Start of Release into CATASTROPHIC (DEFAULT) Environment(')

FAILURE OF REACTOR BUILDING LEAK RATE LEAK RATE LEAK RATE Release Rate, in 100%/HOUR 1U00%/DAY 100%/DAY Terms of Percent of UNFILTERED FILTERED Source Inventory Catastrophic Failure of Secondary Containment (1) HOLDUP TIME for a spent fuel pool release is defined as reactor building holdup time prior to release to the environment. During this time period, credit is taken for reactor building airborne activity removal due to plateout by natural processes and water sprays prior to release to the environment.

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Tab 4 EP-PS-249-4 PICSY VENT RELEASE RATES GUIDELINES SITE TOTAL RELEASE RATES pCVmin RELEASE UNUSUAL EVENT ALERT EAL

Reference:

NIA 15.1 15.2 as read in PICSY for 60 min as read in PICSY NOBLE GAS: Any noticeable Increase 2.OOE+6. 2.00E+8 above pre-event values EP-AD-000-088, Revision 1, Page 1 of 1

Tab 6 EP-PS-249-6 IDENTIFICATION OF RELEASE IN PROGRESS There is a radiological release in progress if ANY of the following are true:

1.0 Any release rates above Technical Specifications or Technical Requirements Manual limits, OR 2.0 Entry into the Emergency Plan for the listed EALs:

• 3.0 Fuel Clad Degradation

• 15.0 Radiological Effluents

• 17.0 Spent Fuel Related Incident

• 18.0 Steam Line Break

• 21 Dry Fuel Storage, AND the DSC has been breached, OR 3.0 The Shift Manager/ED/RM has reason to believe that an unmonitored release is in progress even though plant indications are otherwise normal, OR 4.0 Initiation of the Standby Gas Treatment System for treatment of activity within containment, OR 5.0 Any radiological release above normal levels to the environment, detected by effluent monitors 5.1 or environmental monitoring, 5.2 and attributable to a declared event.

5.3 Normal levels are the highest reading in the last 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to the emergency, excluding the current peak value. The Dose Assessment Staff is not required to determine this quantitatively. Dose Assessment Staff should identify a release in progress if:

release rates are visibly higher than known data prior to the start of the event, OR

• information is received from Operations that release rates are above normal levels and are attributable to a declared event.

5.4 Field monitoring readings above instrument lower limits of detection or RMS readings yielding unanticipated alarms.

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