NRC 2011-0016, License Amendment Request 241, Alternative Source Term, Dose Analysis Revision
| ML110270085 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 01/27/2011 |
| From: | Meyer L Point Beach |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| NRC 2011-0016 | |
| Download: ML110270085 (4) | |
Text
January 27,201 1 NRC 201 1-0016 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units I and 2 Dockets 50-266 and 50-301 Renewed License Nos. DPR-24 and DPR-27 License Amendment Request 241 Alternative Source Term Dose Analvsis Revision
References:
(1)
FPL Energy Point Beach, LLC letter to NRC, dated December 8, 2008, License Amendment Request 241, Alternative Source Term (ML083450683)
(2)
NextEra Energy Point Beach, LLC letter to NRC, dated January 21,201 1, License Amendment Request 261, Extended Power Uprate, Response to Request for Clarification NextEra Energy Point Beach, LLC (NextEra) submitted License Amendment Request (LAR) 241 (Reference I ) to the NRC pursuant to 10 CFR 50.90. The proposed amendment would revise the current licensing basis to implement the alternative source term (AST) through reanalysis of the radiological consequences of the Point Beach Nuclear Plant (PBNP) Final Safety Analysis Report (FSAR) Chapter 14 accidents.
During an NRC desk audit of the Extended Power Uprate (EPU) boron precipitation analysis at Westinghouse's Rockville, Md. Offices on January 20, 201 1, the NRC reviewed specific information related to the margins in the analysis. In response to NRC information requests during the audit, NextEra made two Regulatory Commitments related to emergency operating procedure revisions and provided additional information supporting the margins and conservatisms in the boron precipitation analysis (Reference 2).
During a telephone conference with the NRC on January 24, 201 I, NextEra was informed that additional margin was required between the time that cold leg injection is initiated during post-loss of coolant accident (LOCA) recirculation, and the time boron precipitation is calculated to occur.
In order to accommodate this additional time margin, a revision to the AST LOCA dose analysis is required. Enclosure 1 provides results of the revision to this dose analysis.
NextEra Energy Point Beach, LLC, 6610 Nuclear Road, Two Rivers, WI 54241
Document Control Desk Page 2 This letter contains no new Regulatory Commitments and no revisions to existing Regulatory Commitments.
The information contained in this letter does not alter the no significant hazards consideration contained in Reference (1) and continues to satisfy the criteria of 10 CFR 51.22 for categorical exclusion from the requirements of an environmental assessment.
In accordance with 10 CFR 50.91, a copy of this letter is being provided to the designated Wisconsin Official.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on January 27,201 1.
Very truly yours, NextEra Energy Point Beach, LLC Larry Meyer Site Vice President Enclosure cc:
Administrator, Region Ill, USNRC Project Manager, Point Beach Nuclear Plant, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC PSCW
ENCLOSURE I NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS I AND 2 LICENSE AMENDMENT REQUEST 241 ALTERNATIVE SOURCE TERM DOSE ANALYSIS REVISION During an NRC desk audit of the Extended Power Uprate (EPU) boron precipitation analysis at Westinghouse's Rockville, Md. Offices on January 20, 201 1, the NRC reviewed specific information related to the margins in the analysis. In response to NRC information requests during the audit, NextEra Energy Point Beach, LLC (NextEra) made two Regulatory Commitments related to emergency operating procedure revisions, and provided additional information supporting the margins and conservatisms in the boron precipitation analysis (Reference I
).
During a telephone conference with the NRC on January 24, 201 I, NextEra was informed that additional margin was required between the time that cold leg injection is initiated during post-loss of coolant accident (LOCA) recirculation and the time boron precipitation is calculated to occur.
As identified in Enclosures 1 and 3 of License Amendment Request (LAR) 241, Alternative Source Term (AST) (Reference 2), the AST dose analysis for a LOCA assumed three hours of operation of the containment spray (CS) system during post-LOCA recirculation. In order to accommodate additional margin for the extended power uprate (EPU) boron precipitation analysis, the AST dose analysis for LOCA described in LAR 241 (Reference 2), and subsequently modified by Reference (3), has been revised assuming two hours of operation of the CS system during post-LOCA recirculation.
The revised dose analysis used the AST methodology that was submitted to the NRC in Reference (2). The assumptions are the same used in Reference (2), as modified by Reference (3), with exception of the CS time discussed above.
The revised LOCA doses in rem total effective dose equivalent (TEDE), replacing the LOCA doses presented in References (2) and (3), are:
Exclusion Area Boundary 14.2 Low Population Zone 1.6 Control Room - All Pathways (excludes shine) 4.65 Control Room - Shine 0.28 Control Room - Total Dose 4.93 The dose analysis presented in Reference (4) regarding the use of the mitigating filter system without crediting the control room emergency filtration system (CREFS) was evaluated.
NextEra determined that for the worst-case large break LOCA, the control room dose would meet the 5 rem TEDE dose limit based on the use of the mitigating filtration unit and administration of potassium iodide (KI), without credit for CREFS.
Page I of 2
References (1)
NextEra Energy Point Beach, LLC letter to NRC, dated January 21,201 1, License Amendment Request 261, Extended Power Uprate, Response to Request for Clarification (2)
FPL Energy Point Beach, LLC letter to NRC, dated December 8,2008, License Amendment Request 241, Alternative Source Term (ML083450683)
(3)
NextEra Energy Point Beach, LLC letter to NRC, dated September 3, 2010, License Amendment Request 241, Alternate Source Term, Response to Request for Additional Information (MLI 024601 15)
(4)
NextEra Energy Point Beach, LLC letter to NRC, dated April 20, 2010, License Amendment Request 241, Alternate Source Term, Proposed Technical Specifications for Control Room Emergency Filtration System (CREFS) (MLl01100605)
Page 2 of 2