ML070580315

Issuance of License Amendment 235 Regarding Auxiliary Feedwater System Allowed Outage Time

ML070580315
Person / Time
Site:	Millstone
Issue date:	02/28/2007
From:	Nerses V NRC/NRR/ADRO/DORL/LPLI-2
To:	Christian D Dominion Nuclear Connecticut
Miller G, NRR/DORL, 415-2481
References
TAC MD0029
Download: ML070580315 (11)

Text

February 28, 2007 Mr. David A. Christian Sr. Vice President and Chief Nuclear Officer Dominion Nuclear Connecticut, Inc.

Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711

SUBJECT:

MILLSTONE POWER STATION, UNIT NO. 3 - ISSUANCE OF AMENDMENT RE: AUXILIARY FEEDWATER SYSTEM ALLOWED OUTAGE TIME (TAC NO. MD0029)

Dear Mr. Christian:

The Commission has issued the enclosed Amendment No. 235 to Facility Operating License No. NPF-49 for the Millstone Power Station, Unit No. 3, in response to your application dated February 7, 2006, as supplemented by letters dated August 14, 2006, and January 2, 2007.

The amendment makes a change to the Technical Specifications to increase the allowed outage time from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days for the inoperability of the steam supply to the turbine-driven auxiliary feedwater (AFW) pump or the inoperability of the turbine-driven AFW under certain operating mode restrictions.

A copy of the related Safety Evaluation is also enclosed. Notice of Issuance will be included in the Commission's biweekly Federal Register notice.

Sincerely,

/RA/ G. E. Miller for Victor Nerses, Senior Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-423

Enclosures:

1. Amendment No. 235 to NPF-49

2. Safety Evaluation cc w/encls: See next page

February 27, 2007 Mr. David A. Christian Sr. Vice President and Chief Nuclear Officer Dominion Nuclear Connecticut, Inc.

Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711

SUBJECT:

MILLSTONE POWER STATION, UNIT NO. 3 - ISSUANCE OF AMENDMENT RE: AUXILIARY FEEDWATER SYSTEM ALLOWED OUTAGE TIME (TAC NO. MD0029)

Dear Mr. Christian:

The Commission has issued the enclosed Amendment No. 235 to Facility Operating License No. NPF-49 for the Millstone Power Station, Unit No. 3, in response to your application dated February 7, 2006, as supplemented by letters dated August 14, 2006, and January 2, 2007.

The amendment makes a change to the Technical Specifications to increase the allowed outage time from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days for the inoperability of the steam supply to the turbine-driven auxiliary feedwater (AFW) pump or the inoperability of the turbine-driven AFW under certain operating mode restrictions.

A copy of the related Safety Evaluation is also enclosed. Notice of Issuance will be included in the Commission's biweekly Federal Register notice.

Sincerely,

/RA/ G. E. Miller for Victor Nerses, Senior Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-423

Enclosures:

1. Amendment No. 235 to NPF-49

2. Safety Evaluation cc w/encls: See next page DISTRIBUTION:

Public RidsNrrDssSpwb RidsNrrDorlLpl1-2 RidsOgcRp RidsAcrsAcnwMailCenter RidsRgn1MailCenter LPL1-2 R/F GHill (2) RidsNrrPMVNerses RidsNrrLACRaynor RidsNrrDirsItsb THerrity Accession Number: ML070580315 - Package No: ML070590053 - TS: ML OFFICE LPL1-2/PM LPL1-2/LA SBPB/BC ITSB/BC OGC LPLI-2/BC NAME VNerses CRaynor JSegala TKobetz DRoth HChernoff GMiller for SLittle for DATE 2/28/07 2/28/07 2/2/07 2/20/07 2/28/07 2/28/07 Official Record Copy

Millstone Power Station, Unit No. 3 cc:

Lillilan M. Cuoco, Esquire Mr. Joseph Roy, Senior Counsel Director of Operations Dominion Resources Services, Inc. Massachusetts Municipal Wholesale Building 475, 5th Floor Electric Company Rope Ferry Road Moody Street Waterford, CT 06385 P.O. Box 426 Ludlow, MA 01056 Edward L. Wilds, Jr., Ph.D.

Director, Division of Radiation Mr. J. Alan Price Department of Environmental Protection Site Vice President 79 Elm Street Dominion Nuclear Connecticut, Inc.

Hartford, CT 06106-5127 Building 475, 5th Floor Rope Ferry Road Regional Administrator, Region I Waterford, CT 06385 U.S. Nuclear Regulatory Commission 475 Allendale Road Mr. Chris Funderburk King of Prussia, PA 19406 Director, Nuclear Licensing and Operations Support First Selectmen Dominion Resources Services, Inc.

Town of Waterford 5000 Dominion Boulevard 15 Rope Ferry Road Glen Allen, VA 23060-6711 Waterford, CT 06385 Mr. David W. Dodson Mr. J. W. "Bill" Sheehan Licensing Supervisor Co-Chair NEAC Dominion Nuclear Connecticut, Inc.

19 Laurel Crest Drive Building 475, 5th Floor Waterford, CT 06385 Rope Ferry Road Waterford, CT 06385 Mr. Evan W. Woollacott Co-Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, CT 06070 Senior Resident Inspector Millstone Power Station c/o U.S. Nuclear Regulatory Commission P. O. Box 513 Niantic, CT 06357 Ms. Nancy Burton 147 Cross Highway Redding Ridge, CT 00870

DOMINION NUCLEAR CONNECTICUT, INC.

DOCKET NO. 50-423 MILLSTONE POWER STATION, UNIT NO. 3 AMENDMENT TO FACILITY OPERATING LICENSE Amendment No. 235 License No. NPF-49

1. The Nuclear Regulatory Commission (the Commission) has found that:

A. The application for amendment by Dominion Nuclear Connecticut, Inc. (the licensee) dated February 7, 2006, as supplemented on August 14, 2006, and January 2, 2007, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and regulations set forth in 10 CFR Chapter I; B. The facility will operate in conformity with the application, the provisions of the Act, and the rules and regulations of the Commission; C. There is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations; D. The issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public; and E. The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.

2. Accordingly, the license is amended by changes to the Technical Specifications as indicated in the attachment to this license amendment, and paragraph 2.C.(2) of Facility Operating License No. DPR-65 is hereby amended to read as follows:

(2) Technical Specifications The Technical Specifications contained in Appendix A, as revised through Amendment No. 235, are hereby incorporated in the license. The licensee shall operate the facility in accordance with the Technical Specifications.

3. This license amendment is effective as of the date of issuance, and shall be implemented within 60 days of issuance.

FOR THE NUCLEAR REGULATORY COMMISSION

/RA/

Harold K. Chernoff, Chief Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

Attachment:

Changes to the License and Technical Specifications Date of Issuance: February 28, 2007

ATTACHMENT TO LICENSE AMENDMENT NO. 235 FACILITY OPERATING LICENSE NO. NPF-49 DOCKET NO. 50-423 Replace the following page of Facility Operating License No. NPF-49 with the attached revised page. The revised page is identified by amendment number and contains a marginal line indicating the area of change.

Remove Insert 4 4 Replace the following pages of the Appendix A, Technical Specifications, with the attached revised pages. The revised pages are identified by amendment number and contain marginal lines indicating the areas of change.

Remove Insert 3/4 7-4 3/4 7-4 3/4 7-5 3/4 7-5

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3/4 7-5a

SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 235 TO FACILITY OPERATING LICENSE NO. NPF-49 DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION, UNIT NO. 3 DOCKET NO. 50-423

1.0 INTRODUCTION

By letter dated February 7, 2006 (Agencywide Documents Access and Management System Accession Number ML060460361), as supplemented by letters dated August 14, 2006, and January 2, 2007 (Accession Numbers ML062270634 and ML070030072, respectively),

Dominion Nuclear Connecticut, Inc. (DNC, the licensee) submitted a request for changes to the Millstone Power Station, Unit No. 3 (MPS3) Technical Specifications (TSs) to the Nuclear Regulatory Commission (NRC or the Commission). The license amendment request (LAR) proposed to revise Section 3.7.1.2 of the current custom TSs (CTSs) for MPS3 to increase the allowed outage time from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days for the inoperability of the turbine-driven auxiliary feedwater (AFW) pump under certain conditions, and makes other minor changes. The proposed changes are based on the NRC-approved TS Task Force Change Traveler (TSTF) 340, Revision 3, and TSTF 439, Revision 2.

The supplements dated August 14, 2006, and January 2, 2007, provided additional information that clarified the application, did not expand the scope of the application as originally noticed, and did not change the NRC staffs original proposed no significant hazards consideration determination as published in the Federal Register on April 11, 2006 (71 FR 18372).

2.0 REGULATORY EVALUATION

Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Appendix A, General Design Criterion (GDC) 34 and GDC 44 reflect the design basis for the MPS3 AFW system with respect to decay heat removal. GDC 34 specifies, in part, that the system safety function shall be to transfer fission product decay heat and other residual heat from the reactor core at a rate such that specified acceptable fuel design limits and the design conditions of the reactor coolant pressure boundary are not exceeded. GDC 44 for cooling water specifies, in part, that a system to transfer heat from structures, systems, and components important to safety, to an ultimate heat sink shall be provided. Both GDCs specify that suitable redundancy in components and features, interconnections, and isolation capabilities shall be provided

TS Limiting Conditions for Operation (LCOs) are defined by 10 CFR 50.36(c)(2)(i) as the lowest functional capability or performance levels of equipment required for safe operation of the facility. Further, when an LCO of a nuclear reactor is not met, the licensee shall shut down the reactor or follow any remedial actions permitted by the TSsuntil the condition can be met.

10 CFR 50.36(c)(3) states that Surveillance Requirements (SRs) are requirements related to test, calibration, or inspection to assure that the necessary quality of systems and components is maintained, that facility operation will be within safety limits, and that the LCOs will be met.

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System Description===

The MPS3 AFW systems consist of two motor-driven AFW pumps and one steam turbine driven AFW (TDAFW) pump. The TDAFW pump has a capacity of 1150 gpm at 2975 feet total developed head (tdh) and the two motor-driven pumps have a 575 gpm capacity each at 2975 feet tdh. The motor-driven AFW pumps automatically start upon receipt of an automatic AFW actuation signal. The TDAFW pump starts automatically by a different set of actuation signals.

Both can be started remotely by operator action at the main control board or at the steam supply board or the switchgear, as appropriate. The MPS3 TDAFW pump design includes three steam supplies, one each from the A, B, and D steam generators (SGs). Each of the TDAFW pump steam supply lines is sized to provide 100 percent of the steam flow that is necessary for operating the TDAFW pump at full capacity. The AFW pumps normally take suction from the demineralized water storage tank (DWST).

The AFW system supplies feedwater to the SGs to remove decay heat from the reactor coolant system upon a loss of normal feedwater, assuming the worst case single failure. In addition, the AFW system is an important mitigation system for other accidents, such as a small-break loss-of-coolant accident. The AFW system also supplies feedwater to the SGs during normal unit startup, shutdown, and hot standby conditions. In order for the AFW system to satisfy flow requirements for the most limiting accident analyses assuming a single failure, at least three independent SG AFW pumps and associated flow paths shall be operable: with two motor-driven feedwater pumps and one steam-driven pump.

Additional clarifications about the operation of the system were provided during a conference call on November 9, 2006. The conference call was documented in a letter to the NRC, dated January 2, 2007, which included revised changes to the AFW TSs. A description of each proposed change and the NRC staffs evaluation follows.

MPS3 TS 3.7.1.2, Proposed Condition A The licensee proposed a new Condition A that addresses the inoperability of the TDAFW pump due to one of the two required steam supplies being inoperable. The allowed outage time for this condition is set to 7 days, consistent with the TSTFs. If operability is not restored in the allowed time, the licensee must transition to Mode 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and continue to Mode 4 within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, which also is consistent with the TSTFs. The format is modified to be more consistent with the current revisions of the MPS3 CTS.

During the November 2006 conference call, the licensee agreed to re-word the condition to ensure no possible conflict with the operable condition requirements of the steam supply was created. While only one supply is physically required to power the TDAFW pump over its entire range, two are required for the steam supply to be considered operable and, therefore, the pump to be considered operable. This is due to the fact that certain events that require operation of the AFW system for mitigation may also result in loss of one steam supply, such as a high-energy line break that results in depressurization of the associated SG.

The 7-day allowed outage time is acceptable based on the full capability of the single steam supply and the low probability of a design-basis accident event requiring AFW system operation that causes the coincident loss of the remaining steam supply. The required time to transition to Modes 3 and 4 are consistent with an orderly shutdown.

The proposed change extends the allowed outage time for the given condition while ensuring safe operation of the facility with respect to the AFW system. Therefore, the proposed TS revision will continue to meet 10 CFR 50.36(c)(2)(i) and is therefore acceptable to the NRC staff.

MPS3 TS 3.7.1.2, Proposed Condition B A new Condition B is proposed that is only applicable immediately after a refueling outage when Mode 2 has not been entered. The allowed outage time of the TDAFW for this condition is set to 7 days, consistent with the TSTFs. If operability is not restored in the allowed time, the licensee must transition to Mode 4 within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, which also is consistent with the TSTFs. The format is modified to be internally consistent with the MPS3 CTS.

In this specific, well-defined condition, the decay heat produced by the fuel in the reactor vessel is very low because approximately one-third of the fuel is new and the remaining fuel has decayed for many days. A single motor-driven AFW pump provides adequate feed to the SGs to remove the limited decay heat present in this well-defined situation. The proposed 7-day allowed outage time is acceptable because the motor-driven AFW system would be able to perform its function for most postulated events, and would only be challenged by very low probability events, such an extended station blackout condition. Additionally, the required time to transition to Modes 4 is consistent with an orderly shutdown.

The proposed change extends the allowed outage time for the given condition while ensuring safe operation of the facility with respect to the AFW system. Therefore, the proposed TS revision will continue to meet 10 CFR 50.36(c)(2)(i) and is therefore acceptable to the NRC staff.

MPS3 TS 3.7.1.2, Proposed Condition C A new Condition C is proposed for when one AFW pump is inoperable due to reasons other than those described in Condition A or B and the plant is in MODE 1, 2, or 3. Proposed Action C requires restoration of the pump to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. If unable to restore to the pump to operable status, then the plant must transition to Mode 3 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and Mode 4 within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. These requirements are generally consistent

with the existing Condition A of TS 3.7.1.2 in the MPS3 CTS. The new condition action statement extends the time to cool down to Mode 4, after reaching Mode 3, from 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. This time frame is consistent with an orderly shutdown.

The proposed change is consistent with the current MPS3 TSs, with the exceptions evaluated for Conditions A and B. The allowed outage time for the given condition will continue to ensure safe operation of the facility with respect to the AFW system. Thus, the proposed TS revision will continue to meet 10 CFR 50.36(c)(2)(i) and is therefore acceptable to the NRC staff.

Therefore, the change is acceptable.

MPS3 TS 3.7.1.2, Proposed Condition D A new Condition D is proposed for when two AFW pumps are inoperable in Modes 1, 2, or 3.

Proposed Condition D requires the plant to transition to Mode 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. These requirements are consistent with the existing Condition B of TS 3.7.1.2 in the MPS3 CTS. If the inoperability continues, the plant must continue to Mode 4 within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. The new condition action statement extends the time to cool down to Mode 4, after reaching Mode 3, from 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

The proposed change maintains the currently required actions for the given condition while extending the required time to reach Mode 4 from 3 to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The NRC staff has reviewed this change and finds that the proposed TS will continue to ensure safe operation of the facility with respect to the AFW system. Therefore, the proposed TS revision will continue to meet 10 CFR 50.36(c)(2)(i) and is therefore acceptable to the NRC staff.

MPS3 TS 3.7.1.2, Proposed Condition E Proposed Condition E directs that no Mode changes be initiated with three AFW pumps inoperable. It is applicable in Modes 1, 2, or 3. It requires immediate action be undertaken to restore at least one pump to operable status and suspends all other LCOs that would require a mode change until one pump is restored to operable status. It is identical to existing Condition C of TS 3.7.1.2 in the MPS3 CTS. Therefore, the change is acceptable.

MPS3 TS 4.7.1.2.1 Proposed Surveillance Requirements The 31-day requirement to verify the position of the valves in the AFW and Steam Supply flow path is reworded by replacing the required verification of all control and isolation valves being open with an allowance that they may be closed if they are capable of being manually realigned to the AFW mode of operation.

This change requires verification of AFW system operability at the same frequency as the current TSs. The allowance for the system to be considered operable in the situation where control and isolation valves are out of alignment, provided they can be manually realigned, would continue to allow the system to perform its design function. The NRC staff has reviewed the propsed SR and finds that it will continue to assure that the necessary quality of systems and components is maintained, that facility operation will be within safety limits, and that the LCOs will be met, thus meeting 10 CFR 50.36(c)(3). The proposed change is therefore acceptable.

4.0

SUMMARY

Based on the information provided and considerations discussed above, the NRC staff finds that the proposed revision to MPS3 TS 3.7.1.2 will continue to meet 10 CFR 50.36(c)(2)(i) and 10 CFR 50.36(c)(3) and are therefore acceptable.

5.0 STATE CONSULTATION

In accordance with the Commissions regulations, the Connecticut State official was notified of the proposed issuance of the amendment. The Connecticut State official agreed with the NRC staffs conclusion as stated in Section 7.0 of this Safety Evaluation.

6.0 ENVIRONMENTAL CONSIDERATION

The amendment changes a requirement with respect to surveillance requirements. The NRC staff has determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant change in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that the amendment involves no significant hazards consideration, and there has been no public comment on such finding (71 FR 18372). Accordingly, the amendment meets the eligibility criteria for categorical exclusion as set forth in 10 CFR 51.22(c)(9). Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendment.

7.0 CONCLUSION

The NRC staff concludes that: (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activity will be conducted in compliance with the Commissions regulations, and (3) the issuance of the amendment will not inimical to the common defense and security or health and safety of the public.

Principal Contributor: T. Herrity Date: February 28, 2007