ML082890527

Meeting with NRC on AST

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 2 ~".

FPL

PREVIOUS AST SUBMITTAL ISSUES

• LAR 224

- Retracted on 1/23/03

- Reason

• Still relied on KI to meet control room dose limits

• Control Room Ventilation System design relative to regulatory expectations

• LAR 241

- Retracted on 1/30108

- Reason

• Modifications required additional review and evaluation 3

FPL

ACTIONS TO ENSURE QUALITY SUBMITTAL

• Review by senior, experienced engineers in Juno

• Benchmarking against other successful AST LARs

• 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 4

FPL

KEY ASSUMPTIONS IN AST ANALYSIS CurrentAOR AST Submittal Planned AST Submittal (TI0-14844) (10/1/07)

Cont. leak rate 0.4 w%/day 0.2 w%/day 0.2 w%/day (Administratively reduced to 0.2%)

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 o gpm 900 gpm 900 gpm Recirculation Phase Manual Throttling N/A Yes No Control Room Ventilation No Yes Yes Recirculation Filtration Analyzed Power level 1549 Mwt 1683 Mwt 1811 Mwt Control Room Unfiltered 10 cfm 105 cfm < - 200 cfm Inleakage Measured 96+/-173 Measured 77+/- 94 Measured 77+/-94 CR Dose Results Thyroid: 292.7 (30 rem) (KI 4.8 TEDE rem 4.9 TEDE rem reduces dose 10X) (LOCA) (LOCA) 5

LAR FORMAT

• Benchmarked to other successful AST LARs including Seabrook, Calvert Cliffs, and S1. Lucie 6 ."".." *.

FPL

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 10 FPL

AST APPROACH TO RAls

• Dedicated team to address RAls

• Face-to-Face meetings to review draft RAls

• Face-to-Face meetings to review draft RAI responses 11 FPL

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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