ML19262A593
| ML19262A593 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point, Salem File:Consumers Energy icon.png |
| Issue date: | 08/16/1979 |
| From: | Mattson R NRC - TMI-2 LESSONS LEARNED TASK FORCE |
| To: | Cunningham G NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD) |
| Shared Package | |
| ML18081A723 | List: |
| References | |
| NUDOCS 7912070102 | |
| Download: ML19262A593 (8) | |
Text
'an arco UNITED STATES
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NUCLEAR RFGULATORY COMMisslON
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VvASHINGTON, D. C. 20555
,,.....,... ' 8-e +4lL.>/,f AUG 161979 g~v H*
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!!OTE TO: Guy H. Cunningham, TTI, Acting Deputy Chief Hearing Counsel FROM:
Roger J. flattson, Jirector, TMI-2 Lessons Learned Task Force
SUBJECT:
BOAP.D QUESTION CONCERilIl1G CLASS 9 ACCIDENTS In response to your request of July 27, 1979, I have attached our response to the Salem spent fuel pool Doard question on Class 9 accidents, c:rc Roger J. I ttson, Director TMI-2 Lessons Learned Task Force
Enclosure:
As Stated cc:
Barry Smith Janice l'oore Gary Zech Walt Pasedag Robert Tedesco John Voglewede John Guibert Fred Anderson 1522 236 7912070 j[O2
t
'QUESTI0f The proposed Annex to Appendix D,10 CFR Part 50, appears to define e Class 9 accident as a sequence of failures which are more severe than those which the safety features of the plant are designed to prevent.
The sequences of failures
-Y at Three Mile Island produced a breach of the containment and a release of
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radiation which could not be grevented by the safety features. Was the occur-rence at Three Mile Island therefere a Class 9 accident? Was the rfsk to the health and safety and the environment "rcmote in probability" or " extremely low" at Three Mile Island, as those terms are used in the Annex?
RESPONSE
The proposed Annex (1) to Appendix D,10 CFR Part 50, states "the occurrences in Class 9 involve sequences of postulated successive failures more severe than those postulated for the design basis for the protective systems and engineered safety features of the plant." The accident at inroe Mile Island Unit 2 involved a sequence (3) of successive failures (i.e. small-break loss-of-coolant accident and failure of the cmergency core cooling system) core severe than those postulated for the design basis of the plant. Therefore, we conclude that the accident at Three Mile Island was a Class 9 event. However, at no time during the TMI-2 accident were the radiological consequences to the public more severe than those calculated for the design basis of the plant.
The common definition of Class 9 accidents are ti ose events whose consequences are severe but whose probability of occurrence is extremely low. The accident at Three Mile Island did occur, yet the release of radioactive material to the offsitu
- Atomic Safety and Licensing Board in the matter of Public Service Electric and Gas Company Salem Nuclear 3enerating Station Unit 1 Spent Fuel Pool Expansion Docket 50-272 July 10,1979 1522 237
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population was very small. We conclude that the cccident at fMI-2 can only be considered a Class 9 event from the standpoint of possible, rather than actual, radiological consequences of the given sequence of failures.
-+
In response to the final question of the risk to health and safety and the environment being " remote in probability" or '7xtremely low" at Three Mile Island, we conclude tnat the radioactive material released during the Tl11-2 accident " represents minimal risks (that'is, a very small number) of additional health effects to the offsite population." (4) 1522 238 H*
4 d
1.
Proposed Annex to Appendix D,10 CFR 50.
Originally published in the Federal Reaister on December 1,1971 (36 FR 22851).
Although the Annex was never adopted as part of the Code, it is currently carried as Appendix I to Regulatory Guide 4.2 (listed below).
2.
Regulatory Guide 4.2, Revision 2, " Preparation of Environmental Reports for Nuclear Power Stations," NUREG-0099, July 1976.
3.
" Investigation into the March 28, 1979 Three Mile Island Accident,"
NRC Office of Inspection and Enforcement, NUREG-0600, August 1977.
4.
" Population Dose and Health Impact of the Accident at the Three Mile Island Nuclear Station," Preliminary Estimate Prepared by the Ad Hoc Interagency Dose Assessment Group, NUREG-0558, May 1979.
1522 239
UNITCD STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD 4
In the Matter of
)
Docket No. 50-272 4
PUBLIC SERVICE ELECTRIC &
Proposed Issuance of Amendment GAS COMPANY to Facility Operating License
.o.
DPR *
(SalemHuclearGenerating
)
i Station, Unit No. 1)
).
l l
CERTIFICATE OF SERVICE l
I hereby certify that copies of "NRC STAFF RESPONSE TO BOARD OVESTION NO. 4 REGARDING THE OCCURRENCE OF A CLASS 9 ACCIDENT AT THREE MILE ISLAND" and
" BOARD QUESTIONS CONCERMING CLASS 9 ACCIDENTS" in tne above-captioned pro-ceeding have been served on the following by deposit in the United States i
nail, first class or, as indicated by an asterisk', through deposit in the i
Nuclear Reg,ulatory Commission's internal mail system, this 24th day of August, 1979.
Gary L. Milhollin, Esq., Chairman Mark J. Wetterhahn, Esq.
1815 Jefferson Street Conner, Moore & Corber Madison, Wisconsin 53711 1747 Pennsylvania Avenue, N.W.
Suite 1050 Mr. Frederick J. Shon Washington, D.C.
20006 Atomic Safety and Licensing
~
j Board Panel
. Ccrl Valore., Jr., Esq.
- - ^
U.S. Nuclear Regulatory Commission 535.Tilton Road t
Washington, D.C.
20555 Northfield, N. J. 08225 Dr. James C. Lamb, III 313 Woodhaven Road Lower Alloways CFeek Township Chapel Hill, North Carolina 27514 c/o Mary 0. Henderson Municipal Building Richard Fryling, Jr., Esq.
Hancock's Bridge, New Jersey 08038 Assistant General Solicitor Public Service Electric and I
ris Company 80 Park Place Newark, New Jersey 07101 1522 240 e
,[
c Mr. Alfred C. Coleman, Jr.
~
Mrs. Eleanor G. Coleman Richard M. Hluchan, Esq.
35 "K" Drive F.ebecca Fields, Esq.
d' Pennsville, New Jersey 08070 Deputy Attorney General
}-
State of New Jersey
- Atomic Safety and Licensing 36 West State Street Board Panel "renton, New Jersey 08625 U.S. Nuclear Regulatory Commission Wathington, D.C.
20555 Keith A. Onsdorff, Esq.
Assistant Deputy Public Advocate
- Atomic Safety and Licensing Department of the Public Advocate Appeal Board 520 East State Street U.S. Nuclear Regulatory Commission Trenton, New Jersey 08625 Washington, D.C.
20555 June D. MacArtor, Esq.
- Docketing and Service Section Deputy Attorney General Office of the Secretary Tatnall Building U.S. Nuclear Regulatory Commission.
P.O. Box 1401 Washington, D.C.
20555 Dover, Delaware 19901 Mr. Dale Bridenbaugh M.H.B.' Technical Associates i
,1723 Hamilton Avenue Suite K San Jose, California 95125 t
U% l en i
Barry H/ Smith Counse7forNRCStaff 8
1522 24i
.l UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD
-Y In the Matter of
)
)
-4 CONSUMERS POWER COMPANY
)
Docket No. 50-155 (Big Rock Point Nuclear Power
)
Station)
)
CERTIFICATE OF SERVICE I hereby certify that copies of NRC STAFF RESPONSE TO CONTENTIONS OF CHRISTA-MARIA AND CONTENTIONS OF JOHN P. O'NEILL, II, in the above-captioned proceeding have been served on the following by deposit in the United States mail, first class, or, as indicated by an asterisk, through deposit in the Nuclear Regulatory Commission's intern.1 mail system, this 29th day of November,1979.
- Herbert Grossman, Esq.
Joseph Gallo, Esq.
Atomic Safety and Licensing Isham, Lincoln & Beale Board Panel 1050 17th Street, N.W., #701 U.S. Nuclear Regulatory Comission Washiraton, D. C.
20036 Washington, D. C.
20555 John A. Leithauser
- Dr. Oscar H. Paris Energy Resources Group Atomic Safety and Licensing General Deliv.ery Board Panel Levering, Michigan 49755 U.S. Nuclear Regulatory Comission Washington, D. C.
20555 John O'Neill, II Route 2, Box 44
- Mr. Frederick J. Shon Maple City, Michigan 49564 Atomic Safety an<i Licensing Board Panel Christa-Maria U.S. Nuclear Regulatory Comission Route 2, Box 108c Washington, D. C.
20555 Charlevoix, Michigan 49720 Philip P. Steptoe, Esq.
Ms. JoAnne Bier Michael I. Miller, Esq.
204 Clinton Isham, Lincoln & Beale Charlevoix, MI 49720 1
One First National Plaza Suite 4200 Barbara J. Godwin Chicago, Illinois 60603 306 Clinton Charlevoix, Michigan 49720 1522 242
,. A'
-
- Atomic Safety and Licensing Ms. Marcy Brown Appeal Board Panel 401 Alice Street
?
U.S. Nuclear Regulatory Commission Charlevoix, Michigan 49720 Washington, D. C.
20555 4
Mrs. W. W. Schaefer, Chairman
- Atomic Safety anri Licensing Radioactive Waste Management Board Panel Study Comittee U.S. Nuclear Regulatory Commission Lake Michigan Foundation Washington, D. C.
20555 c/o 3741 Koehler Drive
- Docketing and Service Section U.S. Nuclear Regulatory Commission Karin P. Sheldon, Esq.
Washington, D. C.
20555 Sheldon, Harmon, Roisman & Weiss 1725 I Street, N.W.
Judd L. Bacon, Esq.
Suite 506 Consumers Power Company Washington, D. C.
20006 212 West Michigan Avenue Jackson, Michigan 49201 Mr. Bruce Janssen Box 1889 Lake Shore Drive Boyne City, Michigan 49712 b GM
/WYGES -
Janice E. Moore Counsel for NRC Staff 1522 243
._.