ML20140E217
| ML20140E217 | |
| Person / Time | |
|---|---|
| Issue date: | 02/21/1986 |
| From: | Fraley R Advisory Committee on Reactor Safeguards |
| To: | Stello V NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| Shared Package | |
| ML20140E202 | List: |
| References | |
| ACRS-GENERAL, NUDOCS 8603270336 | |
| Download: ML20140E217 (4) | |
Text
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[, pn AtGg Do UNITED STATES 8
o NUCLEAR REGULATORY COMMISSION ADVISORY COMMITTEE ON REACTOR SAFEGUARDS 7
o, 4;
W ASHINGTON, D. C. 20555 February 21, 1986 MEMORANDUM T0:
Victor'Stello.
Acting Executive Director for Operations FROM:
R. F.
ra ey, Executiv i rector for ACRS
SUBJECT:
CONTAINMENT VENTING GUIDELINE The ACRS has established a Subcommittee on Containment Venting Emergency Procedure Guidelines (EPGs).
The Subcommittee plans to meet in about two months to begin its review of this matter and to review positions and plans by operating utilities, and by the NRC Staff in this regard.
In addition to this, the Subcommittee on Safety Philosophy, Technology and Criteria will be meeting on March 12, 1986 and will, as part of this meeting, be briefed on the progress of the NRC Staff's development of containment performance guidelines.
It would be useful if the NRC Staff would at that time provide a short (approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />) briefing on the status of the NRC work on containment venting.
This information would be used in the planning for the first meeting of the Subcommittee on Containment Venting Procedure Guidelines.
Dr. Okrent, the Subcommittee Chairman, has requested that to help the Subcommittee initiate its review, the Staff be asked to provide the following back-ground information in writing as soon as is practical.
Specific issues can then be identified for the one hour March 12, 1986 discussions.
1.
What is the overall plan of action and schedule of the Staff with regard to containment venting EPGs?
2.
Please provide the ACRS with a copy of the current containment t
venting EPGs for Mark III and indicate the status of the NRC Staff's review of the reactors EPGs and any plants specific implementation of these EPGs.
3.
In its letter of August 18, 1982, on Grand Gulf Station, one of the lead BWR Mark IIIs, the ACRS stated, "MP&L has proposed to include in the Grand Gulf Emergency Procedures a provision for venting the containment in the unlikely event of buildup of pressures above the design basis. The NRC Staff has not completed its review of this proposal.
The ACRS wishes to be advised when the NRC Staff has reached a position on this matter and to have an opportunity to comment generically or specifically." The ACRS had an essentially identical paragraph in its letter of July 17, 1984, on the River gg32 gg36 g 24 EDo --- 001460 O
s, Containment Venting Guideline February 21, 1986-Bend Station. What is the status of the NRC Staff's review of the final or interim basis containment venting EPGs for these and other Mark III reactors. What are the NRC Staff's plans and schedule for ACRS review?
4.
What is the technical and philosophical safety basis for the SER on Radioactivity Release Guidance issued by the Staff on November 23, 1983? What review and approval process did this SER receive?
5.
What is the status of the NRC Staff's consideration of containment venting EPGs for Mark I and Mark-II reactors, for ice-condensers, and for large dry containments? Please. provide and describe the technical and philosophical rationale, as it currently exists.
6.
In a letter dated November 12, 1985, to the NRC from the Mark III Containment Hydrogen Control Owners Group (HC0G), venting is proposed under some conditions, without specification of the offsite radioactive release rate. With regard to this proposal:
(a) What is the technical basis and safety philosophy for such a procedure and what. release rates will be considered.
(b) What are the scenarios during which such procedures might be used and what are the estimated frequencies for these scenarios.
(c)
In the event that these procedures would be used, who would be involved in the decision to use them and who would have the authority to order the use of these procedures.
(d) To what degree are the use of such procedures influenced by differences in containment design.
(e) What is the status of the NRC Staff's review of (a), (b), (c) and (d) above? To what extent has the use of relatively inexpensive filters, such as are being considered by the French, been considered by either the Owners Group or the NRC Staff.
7.
The HC0G letter of November 12, 1985, also proposed other situa-tions as trigger points for venting-related actions. What criteria or analyses will the Staff use in arriving at a judgment concerning their acceptability?
The ACRS looks forward to working with your Staff in arriving at a satisfactory resolution. Dean Houston and Richard Savio are the ACRS Staff members assigned to this review and are available to answer any questions your Staff might have.
Containment Venting Guideline February 21, 1986 cc:
R. Hernan, NRR R. W. Houston, BWR/NRR G. Lainas, BWR/NRR M. Ernst, RES
.O c
DISTRIBUTION eCentral File RSB R/F NRC PDR Local PDR MWHodges E00 #001460 EDO Reading H. Denton D. Eisenhut V. Stello G. Lainas D. Crutchfield OELD OCf. (3)-
-SECY (31-PPAS (ED0 #001460 R. Bernero L. Kriesel D. Nottingham #001460 V. Stello J. Roe T. Rehm J. Sniezek
)
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