ML19345D699

Submits Monthly Mgt Ltr 8 for Oct 1980 Re Containment Analysis Support for Sep.

ML19345D699
Person / Time
Site:	Palisades, Oyster Creek, Ginna
Issue date:	11/24/1980
From:	Cummings G, Vreeland D LAWRENCE LIVERMORE NATIONAL LABORATORY
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
CON-FIN-A-0241, CON-FIN-A-241, TASK-06-02.D, TASK-06-03, TASK-6-2.D, TASK-RR IF80-294, NUDOCS 8012160490
Download: ML19345D699 (3)

Text

-e . w m ...

-y-A

,dfd NUCLEAR SYSTEMS SAFETY PROGRAM TF80-294 November 24, 1980 Mr. D. G. Eisenhut Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Monthly Management Letter #8 October, 1980 NRC FIN #A-0241 Containment Analysis Support for SEP

Dear Mr. Eisenhut:

1. Program Objective and CNcription The purpose of this program is to enable the U.S. NRC staff to resolve containment safety issues addressed in SE0 Safety Topics VIO-2.0 and VI-3. These safety topics are concerned with the ability of the containment to withstand the increase in containment atmosphere pressure and temperature due to a postulated break of a high energy line inside the containment. In addition, the program will define the appropriate p' essure and temperature conditions for the environmental qualification of equipment.

To accomplish the objectives of this program, the existing docket information is reviewed and evaluated for each SEP facility. Based on this review, audit and/or original analyses may be performed to complete the SEP safety topic review.

2. Progress - October 1 through October 31, 1980 There were no milestones scheduled for completion during the month of October. However, there were 5 SEP facilities scheduled to be finished by September of which three are nearing ccmpletion. This has been do principally t' oroblems encountered with the reflood modeling mentioned earlier in th- tember Monthly Management Letter. Most of these problems ht %en resolved this month and we expect to be back on schedule within .. next few months. This is provided there are no future problems encountered with the next few SEP facilities such as inadequate information to carry out the analysis. The status and specific progress made with each SEP facility is as follows: $

m =100MD

- , . t . - _ _ . . _ -

~

Mr. D. G. Eisenhut page 2 November 24, 1980 TF80-294 a) Palisades - A considerable effort has been expanded attempting to find a set of RELAP4 - M007 options which allow the code to run with results which reasonably complies with the SRP. The Aerojet "A" implicit correlation was made to work and generally provides a Carryover Rate Fraction (CRF) of 0.8 + 0.1 during the course of the

transient. The moving mesh detailed Eeat transfer model has found to be unnecessary, and its removal has reduced the total estimated run time from eight to two hours per run.

In addition to calculating reflood using RELAP4, various methods were tried to simulate reflood using CONTEMPT. Energy sources and rate of mass and energy release were computed for different sets of assumptions using the results of blowdown. The energy sources are then released at a constant rate to the containment. Results of this methodology and a comparison with the RELAP4 reflood result will be presented to the NRC in November.

b) Ginna - The blowdown and containment models have been completed.

Currently, work is being performed on the reflood calculation in much the same manner as Palisades.

c) Oyster Creek - The blowdown calculation using a cold-leg recirculation line break for containment peak pressure has been completed. Currently, work is being performed on the CONTEMPT model

.! which has been unstable during vent clearing.

3. Meetings 10-21-80 LLNL-EI Technical Meeting to discuss reflood difficulties.

Attendees LLNL - D. Vreeland, EI - G. Niederauer, G. Sawtelle, R. Breeding.

4. Funding FY80 C/0: $ 66K FY81: 0 Total FY81 Funds Available: $ 66K Costs (M0/YTD): $ 26K/$26K Liens: 0 Total Obligations: $ 26K Sincerely, L,d 4.J David Vreeland Principal Investigator Y tj i) '

ltih QpLus~n/'J Garth Cumnings j NSSP/ Reactor Safety Program Leader

Mr. D. G. Eisenhut psge 3 November 24, 1980 TF80-294 DGV:km cc: W. Russell B. Bowman y J. Shapaker R. Bailey 7 C. Tinkler B. Grenier E. Adensam E. Redden W. J. Gallagher i

1 i

1 1

l l

l l

l