ML040150581

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Pre-Submittal Meetingslides - Alternative Source Term License Amendment
ML040150581
Person / Time
Site: Columbia Energy Northwest icon.png
Issue date: 01/14/2004
From:
Energy Northwest
To:
Office of Nuclear Reactor Regulation
References
Download: ML040150581 (27)
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IF NR C/Energy Northwest Meeting Alternative Source Terml License Amendment Pre-submittal Meeting January 14, 2004 ENERGY People Vision Solutions

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-- f Introduction Engineering Management:

Mike Humphreys Robin Feuerbacher Licensing Management:

Doug Coleman Project Team Personnel:

Abbas Mostala Tim Powell Mike Brandon Contractor Support:

Jim Metcalf ENERGY 2

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Agend a AST Submittal Purpose

  • Scope of Technical Specifications Changes
  • SGT JCO Resolution
  • Draw Down Analysis
  • Meteorological Data
  • Control Room Inleakage
  • Dose Analyses and Differences
  • AST Submittal Schedule
  • Accuracy and Completeness
  • Staff Review Topics ENERGY 3

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AST Submittal Purpose Mike Brandon

  • Revision to Technical Specifications and Bases to reflect AST methodology (Reg Guide 1.183)
  • Resolution of standby gas treatment/secondary containment draw down analysis

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I Scope of TS Changes Mike Brandon I

I I-I; TS SECTION CHANGE Definitions Revised DOSE EQUIVALENT I-131 LCO 3.1.7 SLC and Added MODE 3 Table 3.3.6.1-1 Table 3.3.6.2-1, Deleted "during CORE ALTERATIONS" LCO 3.6.4.1,.2 &.3 and added "recently" SR 3.6.1.3.10 Revised secondary bypass leakage from

< 0.74 scfh to 0.04%[volume]/day TS 3.6.1.8 MSLC Deleted in its entirety ENERGY 5

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T V-Scope of TS Changes Mike Brandon

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TS SECTION CHANGE SR 3.6.4.1.1 Replaced > 0.25 inch vacuum wg with > 0 SR 3.6.4.1.4 Deleted this 24 month surveillance to draw down in < 120 seconds SR 3.6.4.3.3 Added new requirement to verify SGT reaches > 5000 cfm in < 2 minutes TS 5.5.7 VFTP Revised SGT System flowrate for filter testing range from "4012 to 4902" to "4500 to 5500" cfm

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v-SGTJCO Resolution Mike Brandon A

  • JCO for nonconformance with 120 second draw down time assumed in Licensing Basis X AST Jco License Amendment will resolve this and establish the new Licensing Basis w The information necessary for staff review and approval will be provided in the AST submittal ENERGY 7

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Draw Down Analysis

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Robin Feuerbacher

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  • Reactor Building (RB) Model
  • Model will use 3 nodes

- ECCS pump room (basement elevation)

- Refueling floor (top floor)

- Remainder of building (RB middle section)

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  • Requirements of SRP 6.2.3
  • Certified 5 %/ 95 % meteorological data
  • Sensitivity analyses being performed a QA database for inputs/assumptions approved by Energy Northwest ENERGY 9

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l--~ i-Meteoro ogical Data Robin Feuerbacher Recent plant meteorological data

  • Expert meteorological vendor Measurement units clearly identified
  • Meteorological data scrubbed for completeness and accuracy by vendor and Energy Northwest
  • Two separate databases maintained by vendor and Energy Northwest for final verification
  • Reasonableness checks performed with vendor and NRC codes ENERGY People Vision
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  • 1 ii w Joint Frequency Distributions compared on-site data at lower elevation with PNNL
  • Four years of recent meteorological data AST (1996-99) verified for
  • Less than five years of data allowed per RG 1.194 n By RG 1.183, meteorological data collected per FSAR
  • Wind speed classes in guidance per RG 1.111 m ENERGY NORTHWEST People*Vision*Solutions

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Meteorological Data

I Robin Feuerbacher Data recovery (%)

1996 1997 1998 1999 Lower elevation* 88.3 91.1 93.7 87.9 90.2 Upper elevation* 86.0 90.9 94.2 85.3 89.1

  • Composite of delta temperature, wind speed, and wind direction available simultaneously

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F-11 1 I Tracer Gas Test completed November 2003 Used ASTM E741 Methodology per RG 1.197 Measured Unfiltered Inleakage (under review)

Single Train results:

Dual Train results:

7 scfm 27 scfm Unfiltered Inleakage input into AST analyses Single Train:

Dual Train:

40* + 10 (ingress/egress) cfm 65* + 10 (ingress/egress) cfm

  • Uncertainty not included per RG 1.197 if < 100 cfm n ENERGY 13 NORTHWEST.

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AST Dose Analyses Robin Feuerbacher

  • STARDOSE computer code for record of analyses RADTRAD for checking purposes by analyst and another independent contractor
  • QA database for inputs/assumptions approved by Energy Northwest

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V Dose Analyses - LOCA Robin Feuerbacher

  • Current Core Inventory Source Term
  • Drywell spray removal credited per SRP model

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Robin Feuerbacher Releases assumed as ground level Containment leakage of 0.50%/day Secondary containment bypass leakage of 0.04%/day

  • 46 scfh MSIV leakage, evenly distributed over 4 lines (may increase pending dose sensitivity analyses and adequate margin to limits)
  • Factor of two reduction in leakages at 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
  • Control Room Emergency Filtration auto-initiated both trains, 1 train manually secured at 30 minutes, no credit for securing one remote intake

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7 r-Differences from

-Previous Submittal-LOCA

  • Revised Control Room (CR) make-up air flows (1300 cfm dual / 800 cfm single train)
  • Reduced unfiltered inleakage (75 cfm dual / 50 cfm single CREF train including CR ingress/egress)
  • Revised ARCON96 and PAVAN atmospheric dispersion factors (X/Qs) for 1996-99 data
  • 20-minute Reactor Building draw down, no mixing credit
  • Dose Conversion Factors based FGR 11 & 12 default data in RADTRAD ENERGY 17 NORTHWEST People -Vision
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Dose Analyses - MSLB Robin Feuerbacher

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  • Activity for release based on Technical Specifications Dose Equivalent Iodine limits
  • MSIV closure time of 6 seconds (>Tech Spec limit)

-Control Room Emergency Filtration (CREF) not credited

  • Direct ground release to environment - no Turbine Building holdup
  • Maximum makeup flow for normal CR ventilation (1100 cfm), no filter credit ENERGY 18 PNORTHWEST People Vision Solutions

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Differences from Previous Submittal-MESLB Direct application of Dose Equivalent 1-131 if l_

"Control Room X/Qs based on RG 1.194 "puff" release model (no steam buoyancy considered)

Off-site X/Qs based on 1996-99 data ENERGY 19 VsNORTHWEST People Vision Solutions

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I-Dose Analyses - CRDA Robin Feuerbacher Fuel damage equals 1.79% of the core

  • Fuel melting occurs in 0.0138% of the core
  • Release fractions of 100% noble gas and 50%

iodine from melted fuel and fraction of core inventory in the fuel gap

  • No credit for CREF filters

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  • Revised CR make-up air flows (same as LOCA analysis)
  • Reduced CR unfiltered inleakage LOCA analysis)

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  • Revised X/Qs for 1996-99 data (same as LOCA analysis)

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  • Solutions 21

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Dose Analyses - FIIA Robin Feuerbacher

  • 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> fuel decay prior to accident Release to the environment occurs over 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> period
  • Fuel damage is 0.528% of the core ENERGY 22

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I Differences from Previous Submittal - FHA

  • Revised CR make-up air flows (same as LOCA analysis)

Reduced CR unfiltered inleakage (same as LOCA analysis)

Revised X/Qs for 1996-99 meteorological data (same as LOCA analysis)

CREF filter efficiency of 95% for gaseous iodine, 99%

for particulate removal (same as LOCA analysis)

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AST Submittal Schedule Robin Feuerbacher

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Activit Meteorological data verified Control room tracer gas tests Atmospheric dispersion factors Dose analyses Secondary cont. draw down analyses CNSRB review and approval NRC submittal Date 11/20/03 - complete 11/10/03 - complete 12/31/03 - complete 2/13/04 2/28/04 4/14/04 4/30/04 S ENERGY w NORTHWEST People Vision Solutions 24

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I Accuracy and Completeness Doug Coleman GENERIC ACTIONS

  • Engineering Reorganization Creation of Design Authority Positions Implementation of the Engineering Electronic Database
  • Quest for Excellence plan m ENERGY 25 WNORTHWEST People -Vision
  • Solutions

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Accuracy and Completeness Mike Brandon SPECIFIC ACTIONS B Line-by-line review Rigorous certification

  • Independent reviews by external experts
  • Independent review by Energy Northwest QA ENERGY 26 NORTHWEST People Vision
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Staff Review. Topics Doug Coleman Anticipated review period

-Coordination of RAIs

  • NRC review team
  • Emerging issues

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