ML20030B709
| ML20030B709 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 08/11/1981 |
| From: | Jabbour K Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8108240015 | |
| Download: ML20030B709 (8) | |
Text
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/l AUG1119bl Docket Hos:
50-413/414 h
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APPLICA!iT:
Duke Power Company FACILITY:
Catawba Nuclear 5tation, Units 1 and 2 StBJECT:
SU!! NARY OF MEETING Oti THE RADIOLOGICAL CONSEQUENCES OF A LIQUID PATHWAY RELEASE FRGl A POSTULATED CORE tlELT ACCID 3T On July 21, 1981, the NRC staff met in Bethesda with representatives froa Duke Power Co1pany to discuss the radiological consequences of a liquid pathway release from a costulated core melt accident at Catawba. A list of attendees is attached (Enclosure 1).
Duke representatives initiated the discussion by stating that Catawba OL application wa: tendered on flarch 26, 1979 and the NRC acceptance review was delayed because of THI-2 and construction scnedule slippage. On April 7,1931, Duke filed an update to the Catawba OL application. Since their application was su5mitted prior to the July 1,1980 date mentione(Crass 9 in the Comission's Statenent of Interim Policy dated June 13,1930 on accidents, they feel that the NRC staff should perform the Class 9 analysis,
i The NRC staff reiterated that it is the Comission policy to require this analysis. Because of the present workload in the Hydrologic and Geo-technical Engineering Branch (HGEB), they have asked the applicant to perform the liquid pathway analysis for Catawba as stated in the HGEB cor.r.1ents for Catawba acceptance review.
Subsequent discussions centered on the Liquid Pathway Generic Study (LPGS),
NUREG-0440, the special features related to Catawba site which are different from the generic study site features such as the dewatering system, groundwater flow, drinking water, fishing and other itens as stated in Enclosure 2.
At the conclusien of the meeting, the NRC staff asked the applicant to address the ite'is that are specific to Catawba site and to include the operating cu;Nar)
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NRC FOTiM 318 (10,809 NRCM O240 0FFICIAL RECOFiD COPY
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I Duke Power Co.npony t procedures for' turning-off the punps in the dewatering systera in case of an accident. Duke agreea to subnit their liquia pathway analysis in late October 1981 for NRC staff review.
Y Kancan Jabbour, Project lianager Licensing Branch #4 Division of Licensing,tiRR
Enclosures:
As statea cc: See next page CISTRIBUTION Docket File LB#4 r/f D. Eisenhut E. Adensam K. Jabbour M. Duncan S. Hanauer R. Tedesco R. iollmer T. Murley R. Mattson l
R. Hartfield, MPA l
R. Codell M. Fliegel DELD OIE (3) bec: LPDR NRCPDR NSIC/ TIC TERA ACRS (10) l l
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CATAWBA Mr. William O. Parker Vice President - Steam Production Duke Power Company P.O. Box 33189 ce:
Charlotte, North Carolina 28242 cc: William L. Porter, Esq.
_ North Carolina Electric Membership Duke Power Company Corp.
P.O. Box 33189 3333 North Boulevard Charlotte, North Carolina 28242 P.O. Box 27306 Raleigh, North Carolina 27611 J. Michael McGarry, III, Esq.
Debevoise & Libernan Saluda River Electric Cooperative, 1200 Seventeenth Street, N.W.
Inc.
Washington, D. C.
20036 207 Sherwood Drive Laurens, South Carolina 29360 North Carolina MPA-1 P.O. Box 95162 Janes W. Burch, Director Raleigh, North Carolina 27625 Nuclear Advisory Counsel 2600 Bull Street Mr. R. S. Howard Columbia, South Carolina 29201 Power Systems Division Westinghouse Electric Corp.
Mr. Peter K. VanDoorn P.O. Box 355 Route 2, Box 179N Pittsburgh, Pennsylvania 15230 York, South Carolina 29745 Mr. J. C. Plunkett, Jr.
NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 Mr. Jesse L. Riley, President Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28208 Richard P. Wilson, Esq.
Assistant Attorney General S.C. Attorney General's Office P.O. Box 11549 Columbia, South Carolina 29211 Walton J. McLeod, Jr., Esq.
General Counsel South Carolina State Board of Health J. Marion Sims Building 2600 Bull Street Columbia, South Carolina 29201 I
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i ENCLOSURE 1 LIST OF ATTENDEES July 21,1981
~
4 NRC DUKE POWER COMPANY K. Jabbour D. Blackman E. Adensam (part-time)
C. Reeves R. Gonzales M. Tully
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M. Fliegel A. Snow 1
R. Codell i
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ENCLCSURE 2 ll Hydrologic Engineering Section Core Meltdown Liquid Pathway Analysis 1.
Bases A.
Basis for Comparison is highest population doses forecast for LPGS land based sites presented in Chapter 6.
B.
Population dose combines all releases and populations for all times into a norm.
C.
Depends on 1.
populations 2.
dilutions 3.
travel time 4.
source type II. Source Term A.
Inventory of radionuclides in core given in Table A7, LPGS B.
Sump-water release given in table A8 f0%
r, C.
Example only for PWR D.
Sump water releases give largest doses E.
Determine whether or not there are credible liquid releases from BWRs.
Conservatively, sump water releases for PWR will probably bound dissolved releases.
F.
Preliminary screening studies indicate that only Sr-90 and Cs-137 are important ia cases where ground water holdup is long and pathway /J-through surface water.
G.
Where ground water holdup is short, Cs-134 Cs-137 and Sr-90 are important. Anything else in core has less than.a 5% contribution to dose.
H.
In dry site analysis where only use is water wells for drinking, Sr-90 and I-129 are important.
G.
References 1.
LPGS(NUREG0440) 2.
Draft Sandia Liquid Pathway Study (Appendix A) 3.
WASH-1400 b
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- r III. Ground Water Transport A.
For surface water users, population dose should depend only on how much of radioactive release escapes the ground and enters the surface water.
This is function only of travel time. Dispersion equations not necessa ry.
B.
Retardation factors and soil properties such as porosity and permeability should be determined whenever possible from site-specific measurements.
If not possible to do this, conservative handbook values may be used i carefully documented.
C.
Estimate pore velocity by darcy equation or by direct measurements.
A useful measurement is dewatering information where available.
D.
In LPGS case, 87 percent of Sr-90 and 31 percent of Cs-137 released from core eventually reached surface water.
E.
For dry site evaluation, equation B-44 in LPGS will be useful for direct population dose estimates in some cases.
y s.,,- fu < water 7 m speet A.
Steady state models may be used because population dose is insensitive to rate of release, only quantity released.
B.
Factors in surface water d'ese are 1.
dilution 2.
number of drinking water users 3.
commercial and sport fisheries 4.
shoreline use (almost all Cs-137 or Cs-134) 5.
sediment adsorption generally will not make'large difference in e
doses, but may be considered (e.g., Erie example)
C. A's reme er - us7, A' 6
/./c!, Ar c. / or, LACMP 4/e/
V.
Interdistfoo A.
How suitable is site for mitigation measures such as slurry. walls, dewatering, gru ting?
8.
Consider 1.
What structures would interfere with placement of mitigation - v feature?
2.
How suitable is soil for trenching?
z 4
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s F
N 3.
Is there a suitable impermeable layer?
4.
How much time would there be before radionuclides started to escape ground water?
5.
What means could be used for preventing local infiltration of rain water to water table?
C.
References 1.
LPGS (NUREG-0440) 2.
San'dia Draft Liquid Pathway Study, Appendix F 3.
Argonne flational Laboratories study on slurry walls 4.
Three Mile Island geology report by T. Nicholson.
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s MEETING
SUMMARY
DISTRIBUTION e
Docket File a ye G. Lear 4
NRC/PDR S. Pawlicki Local PDR V. Benaroya
(('
TIC /NSIC/ TERA Z. Rosztoczy +
LB #4 r/f W. Haass 4
-4 gh H. Dneton D. Muller i-
~
b E. Case R. Ballard p%
8 D. Eisenhut W. Regan
/,
R. Purple R. Mattson
/
B. J. Youngblood P. Check
- fT.J. i #
A. Schwencer
- 0. Parr F. Miraglia F. Rosa g@
1 J. Miller W. Butler bg1 G. Lainas W. Kreger R. Vollmer R. Houston J. P. Knight T. Murphy R. Bosnak L. Rubenstein
- F. Schauer T. Speis R. E. Jackson W. Johnston Attorney, OELD S. Hanauer OELD W. Gammill 0IE (3)
T. Murley ACRS (10)
F. Schroeder R. Tedesco D. Skovholt N. Hughes M. Ernst K. Kniel NRC Particioants:
G. Knighton A. Thadani D. Tondi J. Kramer D. Vassallo P. Collins D. Ziemann A. Toalston V. Moore M. Srinivasan l
Chief, SPEB: DST l
bec:
Applicant & Service List R. Gamble E. Adensam Project Manager K. Jabbour Licensing Assistant M. Duncan e
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