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EPID:L-2021-LRM-0037, Summary of April 8, 2021, Teleconference with Entergy Operations, Inc. to Discuss Forthcoming LAR Concerning Reactor Coolant System Primary Activity and Primary-to-Secondary Leak Rate (Open) |
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Pre-Submittal Meeting - ANO-1 LAR Related to RCS Primary Activity and Primary-to-Secondary Leak Rate
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Summary of Teleconference with Entergy Operations, Inc. to Discuss Forthcoming LAR Concerning Reactor Coolant System Primary Activity and Primary-to-Secondary Leak Rate
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2021-04-08
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[Table view] |
Text
Pre-Submittal Meeting ANO-1 LAR Related to RCS Primary Activity and Primary-to-Secondary Leak Rate April 8, 2021
Agenda
- Dose Models
- Source Term
- Proposed Technical Specification Values
- Preliminary Dose Results
- Thermal Hydraulic Model
- Determination of Flashing Fraction 1
Purpose Discuss the proposed changes to the ANO-1 Technical Specifications (TS) for RCS activity and Primary-to-Secondary leakage.
- These changes are the result of a proposed revision to the steam generator flashing fraction due to the identification of a non-conservative TSs in 2018.
- Describe how the proposed flashing fraction was determined and the subsequent impacts to applicable technical specifications.
2
=
Background===
- Current Technical Specification (TS) Values
- TS 3.4.12 Dose Equivalent Iodine
< 60 µCi/gm
- TS 3.4.12 RCS I-131 Primary Activity
< 1.0 µCi/gm
- TS 3.4.13 RCS Primary-to-Secondary Leak Rate 150 gallons per day
- Based on the use of Alternate Source Term (10 CFR 50.67)
- Approved in October 2009 3
Background (continued)
- October 2018, it was identified that the off-site dose consequences for the ANO-1 Steam Generator Tube Rupture (SGTR) event were non-conservative.
- Failed to consider post-trip High Pressure Injection (HPI) flows during event.
- Maintains Reactor Coolant System (RCS) pressure at a higher level, leading to a higher primary-to-secondary leak rate.
- Extends timing to isolate the ruptured SG
- Potential higher release 4
Background (continued)
- While working to resolve the issue, it was identified that a potentially non-conservative value was used for the flashing fraction.
- Flashing fraction is the fraction of the RCS leakage that vaporizes when it enters the secondary, rather than entering the SG liquid.
- Same flashing fraction was used in the Main Steam Line Break (MSLB) and Rod Ejection events dose analyses.
- ANO-1 took compensatory measures to limit the RCS Primary Activity and Primary-to-Secondary leak rate to bring the potential dose consequences under the acceptance criteria in accordance with current NRC guidance based on using a flashing fraction of 100%.
5
Methodologies and Inputs
- Dose Analyses performed with RADTRAD
- Maintained the previous release points
- Maintained the previous X/Qs
- ANSI 18.1 Source Term
- Revised Thermal-Hydraulics
- Revised flashing fraction
- Thermal-Hydraulics analysis revised using RELAP5/MOD2-B&W
- New flashing fraction determined using Computational Fluid Dynamics (CFD) and heat transfer calculation methods.
6
Source Term
- With no event-induced fuel failures, just the RCS source term.
- For Rod Ejection, maintaining the source term
- The Rod Ejection event induces fuel failures 7
Thermal-Hydraulic Model (closed)
- Modeled with RELAP5/MOD2-B&W, performed by Framatome
- Doubled-ended tube rupture at full power
- 9.6 minutes for early trip case (makeup/letdown mismatch), 21.6 minutes for delayed trip
- No operator actions until 20 minutes after tube rupture
- Single failure of ADV Block Valve on Unaffected SG
- Operator dispatched, opened at 70 minutes 8
Preliminary Results
- A flashing fraction of 40% of the flow from the ruptured tube at 4 minutes after the scram in the SGTR event
- A flashing fraction of 100% everywhere else in all other analyses.
- RCS Dose Equivalent Iodine (DEI) - 24 µCi/gm (60 µCi/gm)
- RCS Primary Activity - 0.25 µCi/gm (1.0 µCi/gm)
- Primary-to-Secondary Leak Rate - 39 gallons per day (gpd) per steam generator (150 gpd) 9
Preliminary Results
- Pre-Existing Spike:
- Exclusion Area Boundary (EAB) 6.1 rem TEDE
- Low Population Zone (LPZ) 1.0 rem
- Control Room (CR) 4.8 rem
- Accident-Induced Spike:
Preliminary Results
- Pre-Existing Spike:
- Accident-Induced Spike:
Preliminary Results
- EAB 3.3 rem TEDE
- LPZ 2.2 rem
- CR 4.95 rem
- EAB 0.7 rem TEDE
- LPZ 0.5 rem
- CR 1.1 rem 12
Conculsions
- TS 3.4.12 DEI
< 24 µCi/gm (< 60 µCi/gm)
- TS 3.4.12 RCS I-131 Primary Activity
< 0.25 µCi/gm (< 1.0 µCi/gm)
- TS 3.4.13 RCS Primary-to-Secondary Leak Rate 39 gpd (150 gpd) 13
Schedule
- LAR submittal expected by the end of April 2021
- Standard approval timeframe requested (13 months) 14
CLOSED SESSION 15
