ML20206G613

Forwards SER Informing That Staff Finds That Util May Remove Consideration of Dynamic Effects Associated with Postulated Rupture of Analyzed Portions of Pressurizer Surge Line Piping from Licensing Basis of Millstone,Unit 2

ML20206G613
Person / Time
Site:	Millstone
Issue date:	05/04/1999
From:	Eaton R NRC (Affiliation Not Assigned)
To:	Necci R NORTHEAST NUCLEAR ENERGY CO.
Shared Package
ML20206G617	List: ML20206G613 ML20206G622
References
TAC-MA4126, NUDOCS 9905100085
Download: ML20206G613 (5)

Text

,/fh b y~g g4 T UNITED STATES

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r j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2000H001 l'

k***** May 4, 1999 Mr. R. P. Necci Vice President - Nuclear Oversight and Regulatory Affairs Northeast Nuclear Energy Company '

P. O. Box 128 Waterford, CT 06385

SUBJECT:

STAFF REVIEW OF THE SUBMITTAL BY NORTHEAST NUCLEAR ENERGY l COMPANY TO APPLY LEAK-BEFORE BREAK STATUS TO THE l PRESSURIZER SURGE LINE, MILLSTONE NUCLEAR POWER STATION, l UNIT 2 (TAC NO. MA4126) l

Dear Mr. Necci:

By letter dated November 9,1998, Northeast Nuclear Energy Company (NNECO) submitted a request for NRC review and approval of its leak-before-break (LBB) evaluation conceming the i

Millstone Nuclear Power Station Unit 2 pressurizer surge line piping. NNECO's submittal was made in accordance with the provision of Title 10 of the Code of Federal Regulations, Part 50 (10 CFR 50),' Appendix A, General Design Criteria 4, which permits licensees to exclude the dynamic effects associated with postulated pipe ruptures from the facility's licensing basis if

" analyses reviewed and approved by the Commission der :unstrate that the probability of fluid ,

l

' system piping rupture is extremely low under conditions consistent with the design basis for the piping." _ LBB evaluations utilizing the guidance of NUREG-1061, Volume 3 and/or Draft Standard Review Plan Section 3.6.3 have been previousy approved by the staff as a method for making such a demonstration. NNECO also supplentnted their original submittal with

) responses on February 26 and March 5,1999, to the NF:C staff's requests for additional information.

The staff has completed its evaluation of the NNECO st.braittal. The information provided by l NNECO in its submittal and in response to the NRC staf rs questions was sufficient to permit the staff to indopendently evaluate the licensee's conclusions. While the results of the staff's l evaluation do differ from NNECO's in some respects, the staff agrees with the licensee's conclusion that LBB behavior has been demonstrated for the pressurizer surge line piping given the licensee's commitment to incorporate operational limits on the pressurizer-to-hot leg temperature gradiant as stated in their February 26,1999, letter. Therefore, the staff finds that NNECO may remove consideration of the dynamic effects associated with the postulated

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R. P. Necci rupture of the analyzed portions of pressurizer surge line piping from the licensing basis of Millstone Nuclear Power Station, Unit 2. The SE which addresses the technical basis for the staffs finding is enclosed. This completes our efforts for TAC No. MA4126.

Sincerely,

,l j')p/i{.f~' Ronald B. Eaton, Sr. Project Manager, Section 2 Project Directorate i Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-336

Enclosure:

Safety Evaluation cc w/ encl: See next page i

  ;       R. P. Necci                                                                          May 4, 1999 rupture of the analyzed portions of pressurizer surge line piping from the licensing basis of Millstone Nuclear Power Station, Unit 2. The SE which addresses the technical basis for the staffs finding is enclosed. This completes our efforts for TAC No. MA4126.

Sincerely, ORIGINAL SIGNED BY: Ronald B. Eaton, Sr. Project Manager, Section 2 Project Directorate i Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-336

Enclosure:

Safety Evaluation cc w/ encl: See next page DISTRIBUTION: i Docket File J. Clifford M. Mitchell ACRS PUBLIC M. Hartzman A. Blough, RI R. Norsworthy (e-mail SE to RCN) PDI-2 R/F R. Eaton OGC J. Zwolinski/S. Black DOCUMENT NAME: G:\MILA4126.WPD IN0lCATE IN BOX: "C"= COPY W/O ATTACHMENT / ENCLOSURE, *E"= COPY WlATTIENCL, "N"=NO COPY OFFICE PDl-2/LA N PDip/PM PDI-2/SC NAME TC Nt n J rd DATE /h/99 / ) /99 h/ /99 OFFICIAL RECORD COPY \ m.

g., [ ' Millstone Nuclear Power Station Unit 2 cc: Ms. L. M. Cuoco Ernest C. Hadley, Esquire Senior Nuclear Counsel - 1040 B Main Street - Northeast Utilities Service Company P.O. Box 549 P. O. Box 270 West Wareham, MA 02576

       . Hartford, CT 06141-0270 Mr. Martin L. Bowling, Jr.

Edward L. Wilds, Jr., Ph.D. . Recovery Officer - Technical Services

       - Director, Division of Radiation            Northeast Nuclear Energy Company Department of En,ironmental Pro'. action   c/o Ms. Patricia A. Loftus 79 Elm Street                              Director- Regulatory Affairs Hartford, CT (M106-5127                    P. O. Box 128 Waterford, CT 06385 Regional Administrator, Region i U.S. N'iear Reguiraory Commission          Mr. J. T. Carlin 475 APandale Road                          Vice President - Human Services Kir.p of Prussie, PA 19406                 Northeast Utilities Service Company P. O. Box 128 rirst Sele:.;tmen                          Waterford, CT 06385 Town cd Waterford 15 Rope Feny Road                          Mr. Atlan Johanson, Assistant Director Waterford, CT 06385                        Office of Policy and Management Policy Development and Planning
       - Mr. Wayne D. Lanning, Director               Division Millstone inspections                      450 Capitol Avenue - MS# 52ERN

,' Office of the Regional Administrator P. O. Box 341441 1 - 475 Allendale Road Hartford, CT 06134-1441

       ' King of Prussia, PA 19406-1415 Mr. M. H. Brothers Charles Brinkman, Manager                  Vice President - Millstone Operations Washington Nuclear Operations              Northeast Nuclear Energy Company.

ABB Combustion Engineering P.O. Box 128

       .12300 Twinbrook Pkwy, Suite 330             Waterford, CT 06385 Rockville, MD 20852 Mr. J. A. Price Senior Resident inspector                  Director- Unit 2 Operations Millstone Nuclear Power Station            Northeast Nuclear Energy Company clo U.S. Nuclear Regulatory Commission     P.O. Box 128 P.O. Box 513                               Waterford, CT 06385 Niantic, CT. 06357 Mr. L. Olivier Mr. F. C. Rothen                           Senior Vice President and Chief
        - Vice President - Nuclear Work Services      Nuclear Officer - Millstone Northeast Utilities Service Company        Northeast Nuclear Energy Company P. O.' Box 128                             P.O. Box 128 Waterford, CT 06385.                     . Waterford, CT 06385

      ~
 -         Millstone Nuclear Power Station
         . Unit 2 cc:

Citizens Regulatory Commission Ms. Nancy Burton ATTN: Ms. Susan Perry Luxton 147 Cross Highway 180 Great Neck Road Redding Ridge, CT 00870 Waterford, CT 06385 Deborah Katz, President '

         . Citizens Awareness Network P. O. Box 83 Shelbume Falls, MA 03170 Ms. Terry Concannon Co-Chair Nuclear Energy Advisory Council Room 4100 Legislative Office Building Capitol Avenue HartfordiCT 06106 Mr. Evan W. Woollacott Co Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, CT 06070 Little Harbor Consultants, Inc.
        ' Millstone - ITPOP Project Office P. O. Box 0630 Niantic, CT 06357-0630 Attomey Nicholas J. Scobbo, Jr.                                   i Ferriter, Scobbo, Caruso, Rodophele, PC                           !

1 Beacon Street,11th Floor Boston, MA 02108 Mr. D. B. Amerine Vice President - Engineering Services Northeast Nuclear Energy Company . P. O. Box 128 Waterford, CT 06385 Mr. D. A. Smith Manager- Regulatory Affairs Northeast Nuclear Energy Company P. O. Box 128 Waterford, CT 06385 I _}}