ML19341B997
| ML19341B997 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 02/11/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 8102280356 | |
| Download: ML19341B997 (2) | |
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a FEB 1 1 1981 DISTRIBUTmm C 0ccket Files ) bcc: TERA LB#1 Rdg NRC/PDR DEisenhut L/PDR JYoungblood NSIC RBirkel TIC Docket Nos 5
MRushbrook ACRS (16) and 50-370 RTedesco SHanauer RVollmer Duke Power Company TMurley ATTN: Mr. William O. Parker, Jr.
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Vice President - Steam. Production RHartfleld, MPA P. O. Box 33189
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OELD 422 South Church Street OIE (3)
Charlotte, North Carolina 28242' l '
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Dear Mr Darker:
Subject:
Sandia Report on Deliberata Ignition in the Ice Condenser Upper Plenum Region of Sequoyah We have received the enclosed Sandia National Laboratory letter report dated February 9,1981, regarding deliberate ignition of hydrogen in the ice condenser upper plenum region of the Sequoyah plant. We request that you provide us with your conments ind technical assessment of this report. Your prompt response will be greatly appreciated Sincerely, l
Robert L. Tedesco, Assistant Director for Licensing l
Division of Licensing
Enclosure:
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Mr. William O. Parker, Jr.
Vice President, Steam Producticn Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 cc:
Mr. W. L. Porter Dr. Cadet H. Hand, Jr., Director Duke Power Company Bodega Marine Lab of California P. O. Box 2178 P. Q. Box 247 422 South Church Street Bodega Bay, California 94923 Charlotte, North Carolina 28242 Richard P. Wilson, Esq.
Mr. R. S. Howard Assistant Attorney General Power Systems Division State of South Carolina Westinghouse Electric Corporation 2600 Bull Street P. O. Box 355 Columbia, South Carolina 29201 Pittsburgh, Pennsylvania 15230 Office of Intergovernmental Relations Mr. E. J. Keith 116 West Jones Street EDS Nuclear Incorporated Raleigh, North Carolina 27603 220 Montgomery Street San Francisco, California 94104 County Manager of Mecklenburg County 720 East Fourth Street Mr. J. E. Houghtaling Charlotte, North Carolina 28202 NUS Corporation 2536 Countryside Boulevard U. S. Environmental Protection Agency Clearwater, F1orida 33515 ATTN: EIS Coordinator Regi i IV Office Mr. Jesse L. Riley, President 345 Courtland Street, N. W.
The Carolina Environme,1tal Study Grcup Atlanta, Georgia 30308 854 Henley Place Charlotte, North Carolina 28207 Mr. Tom Donat Resident Inspector McGuire NPS J. Michael McGarry, III, Esq.
c/o USNRC Debevoise & Liberman Post Office Box 216 1200 Seventeenth Street, N. W.
Cornelius, North Cuolina 28031 Warhington, D. C.
20036 Shelly Blum, Esquire Robert M. Lazo, Esq., Chairman 1402 Vickers Avenue Atomic Safety and Licensing Board Durham, North Carolina 27707 U. S. Nuclear Regulatory Commibion l
Washington, D. C.
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Dr. Emeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
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Sandin National Laboratories ste; February 9, 1981 Ainuquerque ne., ue.,co e n as o: S.cmas E. Iturley and Danuced F. Tess United States Nuclear Regulatory Crmmisuion
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s 4 ect: Deliberate Ignition in the Ice Condenser Upper Plenum Region of Sequoyah In reference 1, Sandia recommended that the igniters located in the upper plenum of the ice condensers (IC) be removed for the Sequoyah Interim Distributed Ignition System (IDIS).
The justification for this suggestion was based on the following reasoning:
We felt that deliberate ignition in the lower com-partment (LC.5 was desirable, and that serious threats to
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containment would most likely arise from situations where LC ignition was prevented.
Lower compartment ccmbustion would not occur if the LC was steam inerted or oxygen deprived.
Small break and large break calculations with the MARCH code shcwed very large and potentially inerting quantities of steam released,at times close to the times of hydrogen release (Figa. 18, 20, 23, and 25 in Ref.1).
LC inerting was, in fact, calculated to occur when the fans were inoperative.
Since the IDIS system is intended to burn lean hydrogen mixtures, and steam inerting in the LC would produce the richest possible hydrogen mixture
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at the ice condenser outlets, we recommended that the igniters there be moved higher up in the upper compartment.
This vould result in the burning of more dilute mixtures and would lessen the possibility of inadvertent local l
detonations occarring in the ice condenser upper plenum region.
.andia has continued its investigation of hydrogen mit'gation systems since the release of the Sequoyah draft (Ref. 1).
Three additional factors concerning igniter placement have been identified which tend to reinforce our earlier conclusions.
These include a re-examination of the assumptions and calculations reported in The first Sandia Drafts, the " anomalous" steam inerting exper$ments performed by Lawrence Livermore Laboratory, and new detonation calculations with the Sandia CSQ computer code.
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