ML092360535

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Request for Additional Information, Round 2, from Containment and Ventilation Branch, on the Proposed Amendment Re. Alternative Source Term
ML092360535
Person / Time
Site: Point Beach  NextEra Energy icon.png
Issue date: 08/26/2009
From: Justin Poole
Plant Licensing Branch III
To: Meyer L
Florida Power & Light Energy Point Beach
Tam P
References
TAC ME0219, TAC ME0220
Download: ML092360535 (4)


Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 August 26, 2009 Mr. Larry Meyer Site Vice President FPL Energy Point Beach, LLC 6610 Nuclear Road Two Rivers, WI 54241-9516

SUBJECT:

POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION FROM CONTAINMENT AND VENTILATION BRANCH RELATED TO THE PROPOSED ALTERNATE SOURCE TERM AMENDMENT (TAC NOS. ME0219 AND ME0220)

Dear Mr. Meyer:

By letter to the Nuclear Regulatory Commission (NRC) dated December 8, 2008 (Agencywide Documents Access and Management System Accession No. ML083450691), FPL Energy Point Beach, LLC, submitted a request to revise the current licensing basis to implement the alternate source term through reanalysis of the radiological consequences of the Final Safety Analysis Report Chapter 14 accidents.

The NRC staff is reviewing your submittal and has prepared a request for additional information (RAI). The RAI was previously sent to you in draft form by email on August 14, 2009, and is now finalized and made formal in the enclosure to this letter. In a discussion on August 20, 2009, your staff agreed to provide the additional information within 30 days of the formal RAI date.

If your need clarification of the enclosed RAI, please contact me at (301) 415-2048.

(?k~*

JuS!in C. Poole, Project ~

Plant Licensing Branch I~~nager Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-266 and 50-301

Enclosure:

RAI cc w/encl: Distribution via ListServ

REQUEST FOR ADDITIONAL INFORMATION - ROUND 2 CONTAINMENT AND VENTILATION BRANCH OFFICE OF NUCLEAR REACTOR REGULATION POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 PROPOSED AMENDMENT TO ADOPT THE ALTERNATIVE SOURCE TERM SCVB#1 Provide the extent of the control room emergency filtration system (CREFS) and the primary auxiliary building ventilation system (VNPAB) that would be required to be functional to support the alternate source term (AST) licensing amendment request (LAR) by providing drawings suitably marked with the system boundaries and a list of structures, systems, and components that would be upgraded to augmented quality status. Include in the response all new equipment that will be added to modify the CREFS and VNPAB to provide redundancy along with a discussion of the quality status to which such equipment will be designed, procured, installed and tested.

SCVB#2 The CREFS consists of a single filter train with redundant fans. It was stated that four control room ventilation fans, which include the two CREFS fans, will auto-start on the emergency diesel generators upon receipt of a containment isolation signal or high radiation signal. Provide the following information:

2a.

When both the CREFS fans are operating in parallel, discuss the maximum air flow through the filter system and the performance of the emergency air filter with particular attention to residence time for the charcoal filter and the assumptions used in the accident analysis.

2b.

For the situation when all four control room ventilation fans (Le., the two control bUilding heating, ventilation, and air conditioning (HVAC) fans and the two CREFS fans) are auto started, discuss the pressure changes that could occur through the ductwork on a four fan operation versus two-fan operation (Le. one control building HVAC fan and one CREFS fan) and the capability of the ductwork to withstand these conditions. Describe the construction and leakage characteristics of the ductwork, potential for unfiltered in leakage of air that could occur, and its impact on the accident analysis using the AST.

2c.

Describe, according to the emergency operation procedures, how long all four fans will operate until operator action secures one train of fans. Indicate if any other operator actions are also required by any of the emergency operation procedures and the priority of stopping one train of fans relative to the other operator actions.

ENCLOSURE

- 2 SCVB#3 Technical specification (TS) surveillance Requirement 3.7.9.6 requires verification that each CREFS emergency fan can maintain a positive pressure of ~ 0.125 inches water gauge in the control room envelope (CRE), relative to the adjacent turbine building during the emergency mode of operation. For the AST amendment, is the CRE required to be pressurized with respect to any other adjacent spaces, including spaces above and below the CRE? If not, provide justification.

SCVB#4 The LAR states that new control room actions are required to restore the VNPAB within 30 minutes following alignment of residual heat removal to the containment sump recirculation mode of operation. The LAR also states that if a loss-of-coolant accident occurs coincident with a loss of offsite power, the VNPAB system will be manually restarted to ensure that the primary auxiliary building vent stack is the source of the release associated with the emergency core cooling system (ECCS) leakage phase of the event. Provide the following additional information:

4a.

Section 5.1.2 of regulatory guide 1.183 states that "assumptions regarding the occurrence and timing of a loss of offsite power should be selected with the objective of maximizing the postulated radiological consequences." Provide a discussion on how this guidance is factored in the AST analysis, and in the emergency operating procedures with respect to starting the VNPAB system.

4b.

Your letter (NRC 2009-0045) dated April 17, 2009, provided proposed TS requirements for the VNPAB. This subject was briefly discussed with your staff in a phone call on June 23,2009. The U.S. Nuclear Regulatory Commission staff's concern is that the surveillance requirement did not include a performance check of the VNPAB in terms of flow, pressure, etc. Please provide a discussion in how credit for VNPAB is taken in the AST dose analysis. Explain how the vent stack becomes the source of all releases during the ECCS leakage phase of the event by mere operation of the VNPAB fans, with no regard for any minimum amount of flow that the fans need to operate at.

4c.

The LAR states that credit is not taken for the VNPAB air filters. However, performance readiness of the VNPAB fans depends on the filter loading conditions. Explain how operators verify that filter plugging will not adversely affect the performance of the VNPAB fans.

August 26, 2009 Mr. Larry Meyer Site Vice President FPL Energy Point Beach, LLC 6610 Nuclear Road Two Rivers, WI 54241-9516

SUBJECT:

POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION FROM CONTAINMENT AND VENTILATION BRANCH RELATED TO THE PROPOSED ALTERNATE SOURCE TERM AMENDMENT (TAC NOS. ME0219 AND ME0220)

Dear Mr. Meyer:

By letter to the Nuclear Regulatory Commission (NRC) dated December 8, 2008 (Agencywide Documents Access and Management System Accession No. ML083450691), FPL Energy Point Beach, LLC, submitted a request to revise the current licensing basis to implement the alternate source term through reanalysis of the radiological consequences of the postulated accidents in the Final Safety Analysis Report.

The NRC staff is reviewing your submittal and has prepared a request for additional information (RAI). The RAI was previously sent to you in draft form by email on August 14, 2009, and is now finalized and made formal in the enclosure to this letter. In a discussion on August 20, 2009, your staff agreed to provide the additional information within 30 days of the formal RAI date.

If your need clarification of the enclosed RAI, please contact me at (301) 415-2048.

Sincerely, IRAJ Peter S. Tam for Justin C. Poole, Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-266 and 50-301

Enclosure:

RAI cc w/encl: Distribution via ListServ DISTRIBUTION:

PUBLIC RidsNrrLABTully Resource LPL3-1 r/f RidsNrrPMPointBeach Resource RidsNrrDorlLpl3-1 Resource GCranston, NRR RidsRgn3MailCenter Resource RidsOgcRp Resource SSun, NRR RidsAcrsAcnw_MailCTR Resource RidsNrrDirsltsb Resource RidsNrrDorlDpr Resource NKaripineni, NRR ADAMS Accession Number: ML092360535 OFFICE LPL3-1/PM LPL3-1/LA NRRlSRXB/BC LPL3-1/BC NAME PTam for JPoole THarris for BTuily RDennig*

LJames DATE 08/25/09 08/25/09 08/19/09*

08/26/09

  • RAI transmitted by memo of 8/19/09.

OFFICIAL RECORD COPY