ML082890527
| ML082890527 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 10/14/2008 |
| From: | Florida Power & Light Co |
| To: | Office of Nuclear Reactor Regulation |
| Cushing, J S, NRR/DORL/LPLIII-1,415-1424 | |
| References | |
| Download: ML082890527 (13) | |
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- Previous AST Submittal Issues
- Actions to ensure quality submittal
- Key Assumptions in the Analyses
- LAR Format
- Modification Summary
- Relationship to EPU
- Schedule
- Approach to RAls
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FPL 2
- Still relied on KI to meet control room dose limits
- Control Room Ventilation System design relative to
- Modifications required additional review and evaluation PREVIOUS AST SUBMITTAL ISSUES
- LAR 224 Retracted on 1/23/03 Reason regulatory expectations
ACTIONS TO ENSURE QUALITY SUBMITTAL
- Review by senior, experienced engineers in Juno
- Senior level internal challenge/calculation review by Westinghouse
- Review and incorporation of previous RAls and industry OE as applicable
- Technical Challenge Boards
- Review by independent industry experts FPL 4
KEY ASSUMPTIONS IN AST ANALYSIS CurrentAOR AST Submittal Planned AST Submittal (TI0-14844)
(10/1/07)
Cont. leak rate 0.4 w%/day (Administratively reduced to 0.2%)
0.2 w%/day 0.2 w%/day ECCS leakage 400 cc/min 400 cc/min to PAS 150 cc/min to PAS 250 cc/min to RWST (Industry/NRC accepted approach)
Spray flow rate on Recirculation Phase ogpm 900 gpm 900 gpm Manual Throttling N/A Yes No Control Room Ventilation Recirculation Filtration No Yes Yes Analyzed Power level 1549 Mwt 1683 Mwt 1811 Mwt Control Room Unfiltered Inleakage 10 cfm Measured 96+/-173 105 cfm Measured 77+/- 94
< - 200 cfm Measured 77+/-94 CR Dose Results Thyroid: 292.7 (30 rem) (KI reduces dose 10X) 4.8 TEDE rem (LOCA) 4.9 TEDE rem (LOCA) 5
LAR FORMAT
AST MODIFICATION
SUMMARY
- Provide ability for containment spray during post LOCA sump recirculation mode Requires aligning a portion of RHR flow to the suction of the Containment Spray Pumps Close RHR discharge valves to a preset throttle position Add a flow restricting orifice in each Containment Spray line Total RHR flow will stay within GSI-191 limits
- Control Room shielding and ventilation system modifications
- Technical Specification reduction in DEI values and allowable Containment leak rate 7
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AST SCHEDULE AST Licensing LAR Submittal October 2008 NRC review complete January 2010 AST implementation Spring 2010 Control Room Ventilation System Modifications Engineering Complete Spring 2009 Installation Spring 2010 Containment Spray During Sump Recirculation 50.59 Evaluation Complete Prior to AST Submittal Engineering Complete Spring 2010 Installation Unit 2 Fall 2009 Installation Unit 1 Spring 2010 Control Room Shielding Modification Engineering Complete January 2009 Installation Spring 2009 FPL 10
AST APPROACH TO RAls
- Dedicated team to address RAls
- Face-to-Face meetings to review draft RAls
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AST Discussion items Control Room Filtration system classified non safety related (one filter train) o Two fans o
DIG power available manually A portion of ECCS Leakage pathway is the PAS vent XlQ o
Two sets of fans o
DIG power available manually New operator action to place containment spray piggy back on RHR o
Operator action on Loss of instrument air to close caustic tank valves in PAS o
New Operator action to position RHR deluge valve to preset throttle position FHA fuel exceeds RG 1.183 footnote 11 criteria