ML19210D459
| ML19210D459 | |
| Person / Time | |
|---|---|
| Issue date: | 10/31/1979 |
| From: | Denise R Office of Nuclear Reactor Regulation |
| To: | Varga S Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19210D457 | List: |
| References | |
| NUDOCS 7911270086 | |
| Download: ML19210D459 (8) | |
Text
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NUCLEAR REGULATORY COMMISSION g,*
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OCT 311979 MEMORANDUM FOR:
S. Varga, Acting Assistant Director for Light Water Reactors, DPM FROM:
R. P. Denise, Acting Assistant Director for Reactor Safety, DSS
SUBJECT:
BOARD NOTIFICATION: RUPTURE STRAIN AND FLOW BLOCKAGE MODELS IN PWR LOCA CALCULATIONS
Reference:
1.) Memo to D. B. Vassallo, from R. L. Tedesco, Board Notification: Conbustion Engineering Rupture Strain Model in LOCA Calculations, dated February 14, 1979.
2.) Letter to D. F. Ross, Jr., from A. E. Scherer, dated September 18, 1978 The NRC staff has determined that parts of the approved ECCS evaluation models, for all light water reactors, relating to cladding rupture tempera-ture, strain, and flow blockage might, in general, be non-conservative and therefore, might not be in compliance with Appendix K of 10 CFR 50.
Section IB of Appendix K states: "To be acceptable the swelling and rupture calcula-tions shall be based on applicable data in such a way that the degree of swelling and incidence of rupture are not underestimated". This matter has been the subject of a previous recommendation of a board notification (Ref.1) for the Combustion Engineering ECCS model.
The staff has recently reviewed all vendor models and compared them to applicable data from ongoing research programs, including the recent Oak Ridge National Laboratory multi-rod burst tests (MRBT). Our evaluation of this information shows that the other models may also not meet the requirements of Section I.B of Appendix K.
In accord-ance with the requirements of NRR Office Letter No.19, the following informa-tion is provided:
1.
The Item for Notification The staff has again reviewed the rupture temperature, strain, and flow blockage components of the various ECCS evaluation models and compared these models to the available data, including the well-characterized recent (MRBT) tests at Oak Ridge.
Our evaluation indicates that these components of the various ECCS models may lead to an underestimation 1400 M 8 7911270 O frG
S. Varga 007 31 1979 of the degree of swelling and incidence of rupture in significant portions of the cladding temperature range encountered in LOCA analysis.
In particular, rupture strain appears to be underpre-dicted in all PWR models in the low temperature alpha phase of Zircaloy.
Since the rupture, strain, and blockage curves of the models underpredict the data in some areas, these portions of the ECCS models might not be conservative and might not be in compliance with Appendix K of 10 CFR 50 which prohibits underestimation of cladding swelling and incidence of rupture.
We have concluded that it is necessary to seek additional information from licensees and their vendors to determine if these models remain acceptable. Therefore, appropriate licensing boards should be notified of our concern and plans for action.
2.
Relevance and Materiality This item is relevant to all LOCA calculations performed in accordance with the CE, Westinghouse, B&W, GE and EXMON evaluation models.
Be-cause of the way in which this subject is handled in BWR models, the staff has not yet determined the extent of the problem for those reactors.
Studies done in the past for BWR's shaw that the results are not as sensitive as PWR's to these models. Also parts of the BWR data base are different, and need to be examined in view of their application.
3.
Significance The most significant information developed since the issuance of Reference 1 was the recent MRBT results, and the staff assessment of all available data.
Previously we expected that relatively small compensating model changes such as those proposed in Reference 2 could off-set the penalty associated with increasing strains and blockages.
Evaluation of the new data, which fill in some missing gaps, allowed significant improvement in the understanding of the entire relevant data base. As a result, it is likely that higher strains and/or block-ages should be calculated for all the PWR models.
Preliminary staff estimations based on sensitivity calculations indicated that the minor model changes previously considered may not be sufficient to compensate for the larger penalties consistent with the new data. However, case specific calculations by applicants and licensees using their applicable evaluation models will be reauired to determine the effect of the new data on the capability of individual plants to meet the peak cladding temperature requirements of 10 CFR 50.46.
We are in the process of preparing more detailed technical information for the applicants and licensees to evaluate and to further assess the significance. We ex-pect to send this information to the applicants, licensees, and appropriate hearing boards and other interested parties in early November.
1400 319
S. varga OCT 31 IS/9 4.
Relation to Projects This relates to all LOCA calculations performed with the GE, CE, Westinghouse, B&W and EXXON LWR evaluation models.
Also, any models derived from these models or the NRC "WREM" model may be affected.
I recommend that appropriate boards be informed of this concero and our plans to follow up with technical discussions with all partiac.oncerned, s
Richard P. Denise, Acting Assistant Director for Reactor Safety Division of Systems Safety cc:
R. Mattson F. Schroeder D. Vassallo D. Ross L. Phillips N. Lauben K. Kniel R. Meyer D. Eisenhut R. Tedesco S. Levine T. Murley
)/100 320 W. Johnston L. Tong H. Denton E. Case
DISTRIBUTION OF BOARD NOTIFICATION Allens Creek (Docket No. 50-466)
Black Fox (Cont'd)
Texas PubTic Interest Research Mr. Maynard Human G ro u p ~, ' I nc.
Dr. W. Reed Johnson Mr. & Mrs. Robert S. Framson Michael I. Miller, Esq.
Bryan L. Baker Mr. Paul M. Murphy J. Morgan Bishop Dr. Paul W. Purdom Margaret Bishop Dr. M. J. Robinson Dr. John H. Buck Mr. Richard S. Salzman Dr. E. Leonard Cheatum Jerome E. Sharfman, Esq.
Carolina Conn Mr. Frederick J. Shon J. Gregory Copeland, Esq.
Mr. Clyde Wisner Elinore P. Cumings Sheldon J. Wolfe, Esq.
Stephen A. Doggett, Esq.
Mrs. Ilene H. Younghein Mr. John F. Doherty Michael C. Farrar, Esq.
Cherokee (Docket No. STN50-491-3)
R. Gordon Gooch, Esq.
Ms. Jacquelyn Dickman Robin Griffith Dr. John H. Buck Carro Hinderstein Dr. Donald P. deSylva Leotis Johnston Dr. Walter H. Jordan Jonathan Kamras J. Michael McGarry, III, Esq.
Rosemary N. Lemmer William L. Porter, Esq.
Mr. Gustave A. Linenberger M. Richbourg Roberson, Esq.
Richard Lowerre, Esq.
Alan S. Rosenthal, Esq.
D. Marrack Richard S. Salzman, Esq.
Brenda A. McCorkle Hon. John R. Mikeska Diablo Canyon (Docket No. 50-275, 323 0.L.)
Jack R. Newman, Esq.
Mrs. Elizabeth Apfelberg Charles Andrew Perez Andrew Baldwin, Esq.
Mr. F. H. Potthoff, III Elizabeth S. Bowers, Esq.
Mr. Wayne Rentfro Mr. Glenn 0. Bright Alan S. Rosenthal, Esq.
Philip A. Crane, Jr., Esq.
Mr. William J. Schuessler Mr. Frederick Eissler Hon. Jerry Sliva David S. Fleischaker, Esq.
Glen Van Slyke Mrs. Raye Fleming Patricia L. Streilein Arthur C. Gehr, Esq.
Mrs. Connie Wilson Mr. Richard B. Hubbard Sheldon J. Wolfe, Esq.
Dr. W. Reed Johnson Yale I. Jones, Esq.
Black Fox (Docket No. STN-50-556/7)
Janice E. Kerr, Esq.
Mr. Alan P. Bielawski Mr. John Marrs Mr. Lawrence Burrell Dr. William E. Martin Jan Eric Cartwright Bruce Norton, Esq.
Mr. Vaughn L. Conrad John R. Phillips, Esq.
Andrew T. Dalton, Jr., Esq.
Alan S. Rosenthal, Esq.
Mrs. Carrie Dickerson Richard S. Salzman, Esq.
Mr. Gerald F. Diddle Mr. James 0. Schuyler Mr. T. N. Ewing Mr. Gordon Silver Joseph R. Farris, Esq.
Mrs. Sandra A. Silver Joseph Gallo, Esq.
Paul C. Valentine, Esq.
Martha E. Gibbs, Esq.
(Cont'd) i400 32i
Distribution of Board Notification Erie (Docket No. STN-50-581/1 Greene Co. (Cont'd)
Elizabeth S. Bowers, Esq.
Andrew C. Goodhope, Esq.
Dr. Frederick P. Cowan Mr. John Nickolitch Thomas A. Kayuha, Esq.
Ms. Rosemary S. Pooler Mr. Frederick J. Shon Arthur L. Reuter, Esq.
Jay Silberg, Esq.
Daniel Riesel, Esq.
Mr. Robert W. Tufts William J. Spampinato, Esq.
Mr. Richard E. Webb Nancy Spiegel, Esq.
Mayor George A. Turner, Jr.
FNP (Docket No. STN-50-437)
Algird F. White Jr., Esq.
Mr. George B. Ward Mr. Harold P. Abrams Hartsville (Docket No. STN-50-518-El)
Mr. Mitchell Attalla Dr. John H. Buck Glenn 0. Bright, Esq.
Leroy J. Ellis, III, Esq.
Dr. John H. Buck Alvin H. Guttennan, Esq.
Vincent W. Campbell, Esq.
William B. Hubbard, Esq.
Mary M. Cheh, Esq.
Dr. J. V. Leeds, Jr.
Troy B. Conner, Jr., Esq.
Robert Pyle, Esq.
Barton Z. Cowan, Esq.
Dr. Forrest J. Remick Thomas M. Daugherty, Esq.
Alan S. Rosenthal, Esq.
John J. Degnan Mr. Jerome E. Sharfman Michael C. Farrar, Esq.
John F. Wolf, Esq.
Harold P. Green, Esq.
Dr. David L. Hetrick Hope Creek (Docket No. 50-354/5)
Richard M. Hluchan, Esq.
Peter Buchsbaum, Esq.
Keith A. Onsdorff, Esq.
Mr. David A. Caccia Dr. Glenn L. Paulson Troy B. Conner, Jr., Esq.
Robert M. Rader, Esq.
Mark L. First, Esq.
Anthony Z. Roisman, Esq.
Richard Fryling, Jr., Esq.
Dr. Willard W. Rosenberg Mr. Ernest E. Hill Richard S. Salzman, Esq.
William Horner, Esq.
Dr. David R. Schink Dr. W. Reed Johnson Carl Valore, Jr., Esq.
Ms. Judith H. Johnsrud James A. Walker Dr. John R. Lamarsh Ellyn R. Weiss, Esq.
Pr. Paul Mecray, Jr.
Mr. John H. Williamson Dr. Oscar H. Paris Sheldon J. Wolfe, Esq.
F. Michael Parkowski, Esq.
Richard S. Salzman, Esq.
Greene County (Docket No. 50-549)
Jerome E. Sharfman, Esq.
Citizens to Preserve the Hudson Valley Jamesport (Docket No. 50-516/7)
Daniel K. Catskill Environmental Protection & Progress Lewis R. Bennett, Esq.
Conmi ttee Mr. Peter D. G. Brown Ms. Shirley L. Bachrach Albert K. Butzel, Esq.
Joel Blau, Esq.
Hon. Donald Carson Mrs. Laetitia deK. Bradley Hon. Edward D. Cohen Mr. William C. Chapek Jeffrey C. Cohen, Esq.
Dr. E. Leonard Cheatum Dr. Richard F. Cole Jeffrey C. Cohen, Esq.
David H. Engel, Esq.
Mr. Ralph S. Decker Dr. George A. Ferguson Carl G. Dworkin, Esq.
(Cont'd) 900 322
Distribution of Board Notification Jamesport (Cont'd)
North Anna (Docket No. 50-338/9 0.L.;
Dr. Harris Fischer Mr. Dean P. Agee Ms. Adelaide Flatau Mrs. June Allen Joseph C. Gramer, Esq.
Mr. R. B. Briggs Dr. Caryl R. Granttham Dr. John Buck Dr. W. Reed Johnson Mrs. Margaret Dietrich Mr. A. E. Kintigh Michael C. Farrar, Esq.
Frederick H. Lawrence, Esq.
Richard Foster, Esq.
Irving Like, Esq.
Anthony J. Gambardella, Esq.
W. Taylor Reveley, III, Esq.
..'chael W. Maupin, Esq.
Richard S. Salzman, Esq.
Dr. Kenneth A. Mcrallom Dr. Arthur Tamplin Dr. Paul W. Purdom Ms. Jean H. Tiedke William H. Rodgers, Jr., Esq.
Edward J. Walsh, Jr., Esq.
Alan S. Rosenthal, Esq.
Sheldon J. Wolfe Esq.
Mr. Janes M. Torson Ira Lee Zebrak, Esq.
Ellyn R. Weiss, Esq.
Marble Hill (Docket No. STN-50-546/7)
Pebble Springs (Docket No. 50-514/5)
Elizabeth S. Bowers, Esq.
Elizabeth S. Bowers, Esq.
Peter Bradford James W. Durham, Esq.
Dr. John H. Buck J. Carl Freedman Charles W. Campbell, Esq.
Donald W. Godard Walker C. Cunningham, Jr., Esq.
Ms. Bernice Ireland Thomas M. Dattilo, Esq.
Kathleen H. Shea, Esq.
Michael C. Farrar, Esq.
Dr. Walter H. Jordan Mrs. David G. Frey Frank Josselson, Esq.
Victor Gilinsky Mr. Lloyd K. Marbet Robert Gray Dr. William E. Martin Joseph B. Helm, Esq.
Dr. Lawrence R. Quarles Mrs. Marie Horine Alan S. Rosenthal, Esq.
Richard Kennedy Richard S. Salzman, Esq.
George A. Leininger, Jr., Esq.
Richard M. Sandvik, Esq.
Mr. Gustave A. Linenberger Peter F. Manning, Esq.
Perkins (Docket No. STN-50-488-90)
David K. Martin, Esq.
Elizabeth S. Bowers, Esq.
Ralph C. Pickard Dr. John H. Buck Donald J. Ridings, Esq.
Mrs. Mary Davis Richard S. Salzman, Esq.
Dr. Donadl P. deSylva Robert C. Slover Dr. Wal ter H. Jordan Dr. Quentin J. Stober Quinten Lawson, Esq.
Ted R. Todd, Esq.
J. Michael McGarry, III, Esq.
Harry H. Voigt, Esq.
William G. Pfefferkorn, Esq.
Michael J. Walro, Esq.
William L. Porter, Lsq.
William A. Raney, Jr., Esq.
McGuire (Docket No. 50-369/70)
Alan S. Rosenthal, Esq.
Shelley Blum, Esq.
Richard S. Salzman, Esq.
Michael C. Farrar, Esq.
Dr. Cadet H. Hand, Jr.
Phipps Bend (Docket No. 50-553/4)
Robert M. Lazo, Esq.
Dr. John H. Buck Dr. Emmeth A. Luebke Mr. Ernest E. Hill J. Michael McGarry, III, Esq.
William B. Hubbard, Esq.
William L. Porter, Esq.
W. Walter LaRoche, Esq.
Jesse L. Riley Ms. Phylis Pierce (Cont'd) 1A00 323
Distribution of Board Notification Phipps Bend (Cont'd)
Skagit (Docket No. STN-50-522/3)
Alan S. Rosenthal, Esq.
Canadian Consulate General Richard S. Salzman, Esq.
Richard D. Bach, Esq.
Dr. David R. Schink Dr. John H. Back Thomas F. Carr, Esq.
Pilgrim (Docket No. 50-471)
Valentine B. Deale, Esq.
Mr. & Mrs. Alan R. Cleeton James W. Durham, Esq.
The Board of Selectmen Michael C. Farrar, Esq.
William S. Abbott, Esq.
Donald W. Godard Dr. John H. Buck Warren Hastings, Esq.
Laurie Burt, Esq.
Dr. Frank F. Hooper Dr. A. Dixon Callihan Roger M. Leed, Esq.
Dr. Richard F. Cole Mr. Nicholas D. Lewis Michael C. Farrar, Esq.
Mr. Gustave A. Linenberger Andrew C. Goodhope, Esq.
Robert Lowenstein, Esq.
Henry Herrmann, Esq.
Mr. Lloyd K. Marbert Patrick J. Kenny, Esq.
Patrick R. McMullen George H. Lewald, Esq.
Alan S. Rosenthal, Esq.
Michael B. Meyer Richard M. Sandvik, Esq.
Richard S. Salzman, Esq.
Robert C. Shofield Mr. Lester B. Smith F. Theodore Thomsen, Esq.
Dale G. Stoodley, Esq.
Francis S. Wright St. Lucie (Docket No. 50-389)
Norman A. Coll, Esq.
Seabrook (Docket No. 50-443/4)
Michael C. Farrar, Esq.
Robert A. Backus, Esq.
Michael Glaser, Esq.
Leonard Bickwi t Dr. David L. Hetrick Dr. John H. Buck Martin Harold Hodder, Esq.
Laurie Burt, Esq.
Dr. Frank Hooper Thomas G. Dignan, Jr., Esq.
Dr. W. Reed Johnson Michael C. Farrar, Esq.
Harold F. Reis, Esq.
E. Tupper Kinder, Esq.
Richard S. Salzman, Esq.
Dr. Kenneth A. McCollom Alan S. Rosenthal Esq.
SteHing (Docket No. STN-50-480)
Norman Ross, Esq.
Ecology Action Dr. Ernest O. Salo Dirk 5. Adams, Esq.
Karin P. Sheldon, Esq.
Dr. Geo,rge C. Anderson Ivan W. Smith, Esq.
Dr. John H. Buck Joseph F. Tubridy, Esq.
Gerald Charnoff, Esq.
Ms. Elizabeth H. Weinhold Jeffrey C. Cohen Esq.
Lex K. Larson, Esq.
Shearon Harris (Docket No. 50-400-3)
Ms. Sharon Morey Wake County Public Library Alan S. Rosenthel, Esq.
Mr. Glenn 0. Bright Richard S. Salzman, Esq.
Dr. John H. Buck Thomas Erwin, Esq.
Wolf Creek (Docket No. 50-482)
Michael C. Farrar, Esq.
Mrs. Diane Tegtmeier M. David Gordon William H. Ward, Esq.
Richard E. Jones, Esq.
James T. Wiglesworth, Esq.
Mr. J.oh n M. Wyl i e, II Dr. J. V. Leeds, Jr.
Alan S. Rosenthal, Esq.
Office of the County Clerk Ivan W. Smith, Esq.
Dr. George C. Anderson George F. Trowbridge, Esq.
Dr. John H. Buck it00 (Cont'd) 4
Distribution of Board Notificat,on.
Wolf Creek (Cont'd)
Atomic Safety and Licensing Mr. Ernest H. Cannon, Jr.
Board Panel Hon. John Carlin Atomic Safety and Licensing Appeal
' erald Charnof f, Esq.
Board Panel Edward G. Collister, Jr.
Docketing and Servica Section Michael C. Farrar, Esq.
Ralph Foster, Esq.
William H. Griffin, Esq.
Mr. Gary Haden Treva J-. Hearne, Esq.
Alan S. Rosenthal, Esq.
WPPSS 4 (Docket No. 50-460/513)
~~Dr. John H. Buck Dr. Donald P. deSylva
/
Joseph B. Knotts, Esq.
Robert M. Lazo, Esq.
Nicholas D. Lewis Richard Q. Quigley, Esq.
Richard S. Salzman, Esq.
Jerome E. Sharfman Yellow Creek (Docket No. 50-566/7)
Dr. John H. Buck Mr. Eddie Fuente William B. Hubbard, Esq.
W. Walter La Roche, Esq.
Ira L. Meyers, M.D.
Dr. Oscar H. Paris Alan S. Rosenthal, Esq.
Richard S. Salzman, Esq.
Ivan W. Smi th, Esq.
Hon. A. F. Sunmer Z_invuer (Docket No. 50-358)
Charles Bechhoefer Mr. Glenn 0. Bright Troy B. Conner, Jr., Esq.
Michael C. Farrar, Esq.
W. Peter Heile, Esq.
Tiraothy S. Hogan, Jr.
Dr. Frank F. Hooper Leah S. Kosik, Esq.
David K. Martin, Esq.
William J. Moran, Esq.} Dr. Lawrence R. Quarles ,a Richard S. Salzman, Esq. 'I John D. Woliver, Esq.}}