ML19345G407
| ML19345G407 | |
| Person / Time | |
|---|---|
| Issue date: | 12/06/1980 |
| From: | Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| FRN-45FR65474, RULE-PR-50, TASK-OS, TASK-RS-220-5 ACRS-1798, NUDOCS 8104070185 | |
| Download: ML19345G407 (8) | |
Text
(
DATE ISSUED:
12/6/8) l, s' N
MINUTES OF THE ACRS SUBCOMMITTEE MEETING ON p
ny N
CLASS 9 ACCIDENTS g
NOVEMBER 21, 1980
/&
The ACRS Subcomittee on Class 9 Accidents met on November 21, 1980 in Washington, DC to review the NRC Research activities in support of degraded core cooling rulemaking, and the related FY 82 budget.
ATTENDEES: ACRS members present were ii. Kerr, Chaiman, D. Okrent, S. Lawroski, E
C. Siess, P. Shewmon, H. Etherington, and D. Ward.
ACRS consultants attending were G. Schott and M. Sichel.
PRESENTATIONS MADE BY:
C. Kelber, NRC/RES G. Arlotto, NRC/0SD W. Butler, NRC/NRR J. Griffith, DOE M. Silberbert, NRC/RES R. Curtis, NRC/RES Attached is a list of documents provided to the Subcommittee and the meeting agenda.
No written or oral comments were received from the public.
NRC Research Activities in Support of Degraded Core Cooling Rulemaking C. Kelber gave an overview of NRC Research activities relating to degraded core cooling rulemaking, and responded to ACRS comments on the 1982 research budget.
Drs. Kerr and Okrent indicated that NRC should reflect on: (a) what information a research programs are ner.Nsary for rulemaking, and the capability of the research program to supply the necessary information; (b) what infomation and research programs are of secondary importance or usefulness; and (c) what information and NRC should have clearly defined and programs are of peripheral importance.
well-founded goals to guide the research program.
>810/ 0 7 0175 7&
' ~ Class 9 Accident. November 21,'1980 Dr. Kelber indicated that short-tem research needs include iodine behavior during accidents. This is needed in deciding whether to require iodine blocking agents and in determining the warning time for evacuation. Experiments on behavior of iodine are underway.
A secand short-tem need is infomation on hydrogen mitigation features for ice condenser containments.
The current degraded core research is basically a reorientation of previously existing programs.
It can be expected to supply about one-half to one-third of what NRC believes to be the necessary information far rulemaking. The remainder will come from programs yet to be initiated.
t g
Some additional points made by Dr. Kelber were:
o The Staff believes that the proposed PBF/ESSOR series of severe fuel damage tests are necessary and should be pursued.
o RES Staff is stretched thin for present and futur workioad.
o The Staff misunderstood the ACRS recommendation concerning funds for LMFBR research.
(It was the Committee intent that the fund be specifically earmarked for such research and not be diverted elsewhere.
It was not the Comittee's intent to give advice on accounting procedures.)
o Degraded core rulemaking is expected to last two to four years.
Steering Comittee on Degraded Core Cooling Activities of the Degraded Core Cooling Steering Comittee were described by Mr. Arlotto,NRC/0SD.
The Committee was fomed October 15, 1980, to coordi-nate rulemaking activities on degraded cooling, siting, engineered safety l
features requirements, and emergency planning.
Currently the Steering Comit-tee is not responsible for determining infomation needs for rulemaking. The Subcomittee reconmended that the Steering Comittee undertake this responsi-bility.
It was noted that the Advance Notice of Rulemaking emphasizes mitigation over prevention.
} ~~ ~T ~T L L-
~
g.
- -. = = - =.
- November 21, 1980 Class 9 Accidents The Steering Cocrnittee is responsible for defining the scope of the proposed A
Mr. Arlotto indicated the rules will likely be deteministic.
rules.
first-draft degraded cosling rule will be ready by about April 1981, along with an action 11an for rulemaking. The rulemaking is primarily aimed at new plants, ratMr then plants operating or under construction.
Licensing Activities on Hydrogen Control Mr. Butler, NRC/NRR, summarized recent hydrogen-related actions.
Commissioner Gilinsky has issued a memorandum suggesting that the Commission meet to discuss whether construction should be halted on BWRs and ice condensers containments are not already constructed. The purpose would be to decide whether Within a few weeks, the containments should be built to a higher design pressure.
the Commission will meet to decide whether to require a construction halt.
Letters have been issued to near-term plants with ice condensers and Mark III containments requiring analyses of containment strength, hydrogen mitigation GE has systems, and survivability of equipment subjected to hydrogen burns.
performed a probabilistic analysis to show that the likelihood of core uncovery is lower for the BWR-6 than for the WASH-1400 BWR.
GE concludes that hydrogen The Staff and mitigation features on Mark III containments are not necessary.
Commission will review GE's analysis.
The Containment Systems Branch (CSB) t.2s issued a user need request to RES.
i The objective is to obtain information on hydrogen generation with respect to rate amount, and combustion properties. The infomation will be used to j
establish design criteria for hydrogen mitigation features and for rulemaking-Infomation obtained by RES will be reviewed under a related issues.
technical assistance program rather than by CSB. The wort scope that RES l
will be expected to perform has yet to be defined.
DOE Programs in LWR Safety The Mr. Griffith, DOE, summarized the Department's programs on LWR safety.
large-containment facility at HEDL has been made available to EPRI for hydrogen transport and mixing studies.
Also, source term investigations of TMI-2 and past The source term program may acquire a high reactor accidents are being performed.
priority in the future.
l
~ ~ ~ ~
g.
-~.
a
. Novemb:r 21, 1930 Class 9 Accidents Severe Accident Phenomenology and Mitigation Research (SAPM)
Gr. Silberberg, NRC/RSR, su rerized research programs on the progra subelements The of Fuel Melt Behavior and Fission Product Release and Transport of SAPM.
objective is to obtain information on feel melting and relocaticn, debris for=a-tion, attack.of the lower vessel, melt-concrete interaction, coo ability, and con-tainment loadings. Projects intended to supply the information were summarized.
The MARCH code was discussed. The Staff ind!cate: that MARCH is not adequate A
for current needs.
Several models in MARCH neec significant improvement.
Differences comparison is being perf ormed between MARCH anc KESS, a German code.
between the two codes will be resolved. When the two codes provide cor: parable results, confidence in MARCH will be increased.
Mr. Curtis, NRC/RSR, summarized research programs in the Mitigation subelemera These include investigations of core catchers, vented-filtered of S APM.
containments, passive contain. ment cooling, hydrogen control, and core reten-tion tunneling. The last item explores the feasibility of tunneling under the base mat to install core catchers in operating plants.
~
Dr. Shewman noted one omission from the Staff's research program on mitigation.
He suggested a dedicated, high reliability pipe to deliver water to the reactor and/or to the reactor cavity.
Executive Session on Advance Notice of Rulemaking The Subcommittee did not offer specific comments on the Advance Notice of Dr. Okrent suggested, however, that each Subcommittee member draft Rulemaking.
his own rules to help clarify and formulate ideas on the subject, and to serve as a basis for stimulating discussion at a future meeting.
Future Meetings No meetings are scheduled at this time.
e wm
\\
i.
Class 9 Accidents Mtg of 11/21/80 l
List of Documents Memo from Kelber to Bernero on Summary on Summary of Thoughts on 1.
Rulemaking Context.
Degraded Cooling Rulemaking - SECY 80-478.
2.
Degraded Cooling Rulemaking - SECY 80-357.
3.
RES Plan of Work for Degraded Core Cooling.
4.
Degraded Cooling Steering Committee - 10 slides.
5.
Licensing Activities on Hydrogen Control Requirements - 3 slides.
6.
DOE Programs Relating to Class 9 Accidents - 2 slides.
7.
Severe Accident Phencmenology Research - 11 slides.
8.
Severe Accident Mitigation Research - S slides.
9.
Draft Chapter 4 from ACRS Report to Congress, 10,
)
11/19/80
- TENT ATIVE PRESENTATION SCHE 33LE -
Class 9 Accidents Subcomittee Meetinc Room 1046,1717 H St., N.W.
Washington, D.C.
November 21, 1980 Organization Presentation Approx.
~
Speaker Time Time MEETIN3 WITH THE NRC STAFF AND CONSULTANTS 8:45 am 1.0 Subcomittee Chairman's Opening Remarks (Closed Session) 2.0 NRC Research Activities in NRC/RSR 20 min 8:50 am C. Kelber Support of Degraded Core Cooling Rulemaking (includ-ing research outside of Decision Unit No. 4) (Closed Session)
NRC/RSR 10 min 9:30 pm 3.0 Response to Committees C. Kelber Comments in NUREG-0699 on FY 82 Budget on Line Items 4a through 4c (Closed Session)
NRC/RSR 10 min 9:45 pm 4.0 Long Range Budget for Severe C. Kelber Accident Phenomena and Mitiga-tion Research (Closed Session) 10:00 - 10:15 am Coffee Break 5.0 Discuss Charter and Approach of NRC/OSD 20 min 10:15 am G. Arlotto Steering Group to Coordinate Degraded Core Cooling and Related Rules (0 pen Session)
NRC/CSB 20 min 11:15 am Hydrogen Generation and Control 6.0 n lter et.al y
During Accidents (0 pen Session) u
' Approach to developing an MRC Position
'Information needs & schedule
'How position might affect operating plants
..-=~=~:..--~---
~
Class 9 Mtg
- PRESENTATION SCHEDULE -
Organization Presentation Approx.
Speaker Time Time 11:45 am DOE 7.0 DDE Class 9 Related Research J. Griffith (Closed Session)
I h
12:00-1:00 pm 00 FY 82 Budget Discussion (Closed Session) 8.1 Fuel Melt Behavior (4a)
NRC/RSR 10 min M. Silberberg
' Budget
' Approach to satisfying rulenaking information needs
- Key issues
- Programs l
- Status i
f
' Foreign Research on Fuel Melt Cehavior and its use in this Country 8.2 Fission Product Release NRC/RSR 10 min M. Silberberg and Transport (4b) l
' Budget
' Approach to satisfying rulemaking infomation needs
- Key issues
- Programs
- Status l
' Foreign Class 9 Research on l
Fission Product Release and Transport and its use in this Country
- u.. _
7
.,, Class 9 Mtg 3
- PRESENTATION SCHE 00LE -
Organization Presers: tion Approx.
Speaker Time Time 8.3 Severe Accident Mitigation NRC/RSR 15 min R. Curtis (4c)
M. Silberberg
- Budget (b
' Approach to satisfying rulemaking information needs
- Key issues
- Programs
- Status
' Foreign P.esearch on Severe Accident Mitigation and its use in this Country 1:0.0 - 2:00 pm Lunch Break 2:00 pm 9.0 Executive Session (0 pen Session)
- ACRS input into Advance i
Notice of Rulemaking on l
Degraded Cooling - Pre-paration of Comments 4:00 pm 10.0 Executive Session (Closed Session)
I
- Preparation of Class 9 Accident Section (Line Items 4a through 4c) of Report to Congress on FY 82 Budget
- Discuss ACRS Follow-up Activities on Stratton and Ring Comments l
5:00 pm ADJOURNENT 4
___