ML023470090
| ML023470090 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/12/2002 |
| From: | Energy Northwest |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML023470090 (18) | |
Text
ENERGY LNORTHWEST People. Vision. Solutions NRC MEETING
1
AST RESUBMITTAL DECEMBER 12, 2002 I
OENERGY NORTHWEST People -Vision. Solutions
,Agenda
- Opening Remarks
- Review of Submittal m Meteorological Data Errors Preparation m MSLB Analysis m Operability Basis m Review of Submittal Issues
- Control Room Ingress/Egress
- Secondary Containment Drawdown Analysis 2
ENERGY ONORTHWEST People.-Vision. Solutions
-Agenda (Cont'd)
- Actions Being Taken by Energy Northwest
"* Meteorological Data Preparation
"* X/Q Modeling and Reanalysis
"* Drawdown Analysis
"* MSLB Analysis
- Project Schedule
- Closing Remarks 3
(ENERGY NORTHWEST People. Vision. Solutions Submittal Errors Meteorological Data Preparation
" Errors related to data preparation and input to ARCON96
"* Incorrect coding of missing or invalid data with 9's
"* Not recognizing orientation of delta T measurement
"* Incorrect wind speed unit selection
"* Conversion to degrees centigrade per 100 meters
"* ARCON96 analysis done by contractor in 1999 4
eENERGY NORTHWEST People. Vision. Solutions
, Submittal Errors (Cont'd)
I m Energy Northwest provided Contractor with.
- Delta T measurements reversed from ARCON96 input format (lower minus upper provided)
- Wind speed data in miles per hour. ARCON96 default is meters/sec
- Delta T in degrees Fahrenheit per 212 feet 5
ENERGY NORTHWEST People. Vision. Solutions Submittal Errors (Cont'd)
"* Contractor verified and approved his analysis per his nuclear QA Class 1 program
"* AST project utilized this previously approved and accepted vendor analysis with one additional review
- Energy Northwest Peer Review included industry expert in ARCON96
"* Preliminary analysis using corrected met data files indicates the control room dose is slightly over 5 Rem limit (keeping other analysis inputs the same) 6
OENERGY NORTHWEST People. Vision. Solutions Submittal Errors (Cont'd)
Main Steam Line Break (MSLB)
"* The gravity term in the force equation was missing
"* A conservatively small drag coefficient was used.
"* Above effects compensated for each other so dose effectively unchanged 7
- ENERGY NORTHWEST People. Vision. Solutions Operability Basis
" The existing JCO for building drawdown remains valid n Basis for JCO is an analysis that utilized NUREG 5055 to calculate X/Q values and it is not impacted by the current met data errors
"- The existing FAO for Control Room inleakage is based on administering KI to Control Room personnel and is not impacted by the current issues 8
O ENERGY NORTHWEST People. Vision-Solutions SubmittaI Issues
- Control Room In-leakage Flow
"* Telecon may have confused issue of ingress/egress versus measured in-leakage
"* Per Lagus, the tracer gas test does not specifically quantify ingress/egress related inleakage
"* One ingress/egress point to Control Room used during test (normal activity was.not restricted however)
"* Normally two ingress/egress points used for Control Room access (both with double doors) 9
CENERGY NORTHWEST People.Vision-Solutions
-Submittal Issues (Cont'd)
- The Control Room has a total of 5 doors (access points). 3 of the doors are not used
- Unfiltered Control Room inleakage attributable to ingress/egress will be addressed by our resubmittal 10
- ENERGY NORTHWEST People. Vision. Solutions Submittal Issues (Cont'd)
Secondary containment drawdown analysis Resubmittal (12/01) was not clear on what GOTHIC analysis was used and what related information from the 1996 submittal was still valid 11
OENERGY NORTHWEST People. Vision -Solutions Actions Being Taken
- Meteorological Data
"* Met data conversion errors have been corrected
"* Revised met data files have been verified by Energy Northwest and a consultant
"* ARCON96 analysis has been re-run using above revised met data files.
12
OENERGY NORTHWEST People. Vision-Solutions Actios -Being Taken (Cont'd)
X/Q Modeling and Reanalysis
"* Refine to more accurately model unfiltered inleakage into Control Room through receptor point within the Radwaste Building
"* For unfiltered Control Room inleakage, utilize ARCON96 X/Q from release point to Radwaste Building HVAC intake point
"* New analysis will model the nuclide buildup within the Radwaste Building which becomes the source for unfiltered inleakage to the Control Room 13
- ENERGY NORTHWEST People-Vision-Solutions Actions Being Taken (Cont'd)
Drawdown Analysis
" Previously submitted (1996) GOTHIC model of the building has not been changed
"* This model will be re-validated prior to re submittal
"* Re-submittal will clarify any changes made from the 1996 GOTHIC analysis, e.g.:
"* GOTHIC updated to version 6.Oa
"* ASHRAE formulation used for boundary condition pressure calculations due to wind on building exterior
"* Bounding condition basis (temperature and wind conditions) not changed 14
@ENERGY NORTHWEST People. Vision Solutions Actions Being Taken (Cont'd)
- MSLB Analysis
"* Submittal will continue to be based on the bubble model currently used corrected by:
"* Gravity term has been added to the force equation
"* Drag coefficient has been revised to 8/3
"* Sensitivity case will be performed based on DG-1111 15
OENERGY NORTHWEST People.-Vision -Solutions Actions Being Taken (Cont'd)
- Dose Analysis
"* Revised met data, updated ARCON96 analysis, and modified transport approach for Control Room unfiltered inleakage
"* No credit for Reactor Building mixing (40%
previously)
"* Control Room tracer gas inleakage test result being investigated to determine appropriate value to use in the analysis 16
(ENERGY NORTHWEST People-Vision. Solutions Actions Being Taken (Cont'd)
" PAVAN offsite X/Q values remain unchanged
"* Resubmittal based on revised dose analysis for each accident (LOCA, FHA, CRDA, and MSLB) 17
ENERGY NORTHWEST People-Vision. Solutions Project Schedule
" Detailed manloading of schedule and funding requests are currently in process.
"* Preliminary schedule indicates resubmittal by July 2003.
"* Resubmittal date to be confirmed by January 6, 2003 18