ML19211C420
| ML19211C420 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point, Susquehanna, Columbia, Limerick, LaSalle, Zimmer, Shoreham, Bailly File:Long Island Lighting Company icon.png |
| Issue date: | 12/20/1979 |
| From: | Anderson C Office of Nuclear Reactor Regulation |
| To: | Hanauer S Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-08, REF-GTECI-CO, TASK-A-08, TASK-A-8, TASK-OR NUDOCS 8001110330 | |
| Download: ML19211C420 (4) | |
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UNITED STATES j
NUCLEAR REGULATORY COMMISSION y
c wAsmNGTON, D. C. 20555 CEC 2 01979 Task Action Plan A-8 Docket Nos.: 50-358, 50-352/353, 50-367, 50-373/374, 50-387/388, 50-410, 50-322, 50- P 314 MEMORANCUM FCR:
S. H. Hanauer Director, Unresolved Safety Issues Program, NRR FROM:
C. J. Anderson, A-8 Task Manager, Containment Systems Branch, DSS APPLICANT:
Members of MARK II Owners Group
SUBJECT:
MEETING WITH MARK II OWNERS TO DISCUSS LONG TERM PROGRAM STATUS (November 14,1979)
Backcround
~
The staff recently completed the review of alternate loads proposed by the MARK II owners as a part of the PARK II Lead Plant Program. With the completion of the review of these remaining Lead Plant Tasks, the staff has turned its attention to the review of the MARK II Long Tem Program. The function of this meeting was to discuss the status of several of the Long Tem Program tasks in advance of the final documentation of these tasks. These discussions were conducted to provide the staff and our consultants an oppor+wnity to identify *ask problems prior to completion of the task.
The significant items discussed in the meeting included: the Creare multivent tests, the 4T condensation oscillation tests, the dynamics lateral load model, the improved chugging load, foreign tests and load combinations.
An attendance list and a copy of the meeting handouts are enclosed.
Sum ary A sumary of the discussicns of the Long Tem Program Tasks is provided below.
1.
Generic Procram Status Sumary Mr. Davis of General Electric provided an overview of the MARK II generic long tem program. The total generic program, including the Lead and Long Tarm Pro-gram (LTP), was aporoximately 85% complete at the end of October 1979. A detailed schedule was presented to shcw the status of milestones for several of the more important LTP tasks. A table of the LTP task documentation was also discussed.
Documentation for the LTP LOCA related steam tests will not be available until the 1735 350 g 330 P
DEC 2 01979 S. H. Hanauer third quarter of 1980. These late dates for task documentation jeopardize the staff's October 1979 schedule for cc=pletion of the LTP review.
Mr. Soben of General Electric discussed the generic positions of the MARK II own-ers for the LTP. He identified those areas where the ownr.r proposed deviating from the staff's lead plant acceptance criteria.
2.
Creare Multivent Test Procram - Task A.ll Mr. Patel of Creare discussed the status of the Creare multivent steam tests.
The objective of this program is 1) to establish the trend of chugging wall loads with the number of vents to confirm that the lead plant approach utilizing single vent data is conservative and 2) to quantify the multivent effect in the LTP to allcw refinement of the lead plant bounding load in the LTP. The first phase of this test program is complete. This includes multivent tests at 1/10 and 1/6 scale. The phase I test report will be submitted to the NRC in June 1980. The staff questioned the ability of the Creare tests to address phasing questiens raised as a result of preliminary observations of related foreign tests.
3.
Main Vent lateral Loads - Task A 13 Mr. Davis of General Electric discussed the status of the A.13 vent lateral Icads task. The lead plant criteria for lateral loads includes a very conservative static and dynamic load specificaticn. The MARK II cwners prepcsed a less conser-vative single vent dynamic lateral load for the GP. The results of several large scale single and dcuble vent tests were studied by the MARK II cwners to confirm the MARK II owners' load specification. Preliminary results of the confirmatory study indicate that the proposed LTP dynamic lateral lead is conservative.
In addition to the single vent dynamic lateral load studies, the MARK I! cwners have also conducted studies to extend the single vent dynamic lateral, load for ap-plication to 28 in. downcomers and to multiple vents. A review of tests in dif-ferent facilities with varying vent diameters (12 to 24 in.) indicates that the dynamic lateral load can be extrapolated to 28 in. vents. In addition, a statis-tical procedure similar to that utilized in the lead plant prcgram was used to extend the single vent lateral load to a multivent dynamic lateral load pecifi-cation.
A report documenting the results of the varicus dynamic lateral load subtasks is in preparatien and will be submitted to the NRC in Decemcer 1979.
4.
Generic Imoreved Chuccine Load - A.16 The MARK II owners discussed the status of the milestenes associated with comple-tion of the generic improved chugging load task. The major task milestones have been completed. A final report documenting this task is currently scheduled to be submitted in February 1980. The staff stated that confirmation of the meth-odology, censidering the results of the large scale multivent Japanese test, was imcortant to resolve staff questions raised during previous meetings with the MARK II owners.
1735 351 e
EC20iE S. H. Hanauer 5.
4T C0 Tests - A.17 The purpose of these additional 4T tests is to resolve questions raised by the staff in NUREG 0487 dealing with vent length effects in establishing the conden-sation oscillation load specification.
Modification of the original 4T test facility has been completed. The shakedcwn tests and 9 scheduled tests have been completed. The total test matrix includes 23 tests at varying conditions of vent submergence, initial drywell air centent pool temperature, break size, break submergence and break type (i.e., steam anc liquid). In additien, tests will be conducted to investigate the effect of a vent riser. The testing program is scheduled to be completed in February 1980.
The MAR.< II owners plan to discuss preliminary observatiens frem these tests some time during the first quarter of 1980. Preliminary cbservations from other related test programs indicate that some vent length related modificatiens to the original CO load specifications may be appropriate. This modification would prob-ably consist of a load specification at frequencies in the 7 to 20 HZ range. Hew-ever, insufficient analyses have been perfomed related to the tests to establish the necessity of a change in the.. original C0 load.
6.
GXSS Tests The GKSS large scale multivent, steam tests were discussed with the MARK II owners.
This included a description of the test facility, the test matrix, testing schedule and preliminary observations of the completed shakedown tests. The staff noted the close phasing of the chugging events and the similarity of chugging events cc-curring at the exit of each vent during gross pool chugging. The staff emchasized the need for a MARK II generic task to include a review of the foreign la.rge scale multivent tests to confim the lead plant loads and provide a basis for the pro-cosed LTp reduced leads.
7.
Load Cor.binations - SRSS A draft copy of the Brookhaven studies en resconse cc:tination methcdologies was released by the staff for cer:xnent in October 1979. The MARK II cwners' cements related to the BNL report were presented by Dr. Kennedy. A cecy of the presenta-tien slides is attached.
Dr. Hou of NRC stated that additicnal BNL studies wculd be required before Critericn 2 of the Newmark-Kennedy criteria could be accepted.
Mcweve), he was optimistic about the ultimate acceptability of criterion 2.
He stated that further efforts to evaluate the modified criterien I wculd probacly be included in a future review program.
The MARK II owners stated that February 1980 appeared to be the best time for the next generic MARK II owners /NRC staff meeting. This meeting would incluoe most of the topics discussed in this meeting.
N Clifford J. Andersen, A-8 Task Manager Centainment Systems Branch Division of Systems Safety
Enclosure:
As stated 1735 352 Cistribution:
.See attached,Jages
Meeting Notice Distribution 4
Distribution:
Docket Files D. Ross NRR Reading File T. Novak CSB Reading file K. Kniel H. Denton Z. Rosztoczy E. Case R. Tedesco R. Boyd S. Hanauer R. DeYoung V. Benaraya D. Skovholt W. Butler W. Haass R. Satterfield R. W. Houston F. Rosa P. Collins D. Muller D. Vassallo R. Vollmer J. Stolz W. Krecer R. Baer V. Moore S. Varga R. Ballard W. Gammill W. Regan C. Heltemes M. Ernst T. Speis G. Lear D. Eisenhut J. Youngblood D. Crutchfield R. Denise P. Check C. Stepp G. Lainas J. Kudrick A. Schwencer J. Shapaker D. Ziemann j NRC POR B. Grimes Local PDR '
G. Knighton Receptionist T. Ippolito OELD R. Reid OSD J. Miller I&E(3)
R. Clark R. Fraley, ACRS (3)
F. Pagano T. Su R. Mattson C. Tan F. Schroeder C. Grimes J. Knight S. Fabic R. Bosnak R. Cudlin S. Pawlicki M. Aycock F. Schauer C. Anderson A. Thadani 1735 353