ML19211C526
| ML19211C526 | |
| Person / Time | |
|---|---|
| Issue date: | 08/30/1979 |
| From: | Butler W Office of Nuclear Reactor Regulation |
| To: | Thadani A Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-09, REF-GTECI-SY, TASK-A-09, TASK-A-9, TASK-OR NUDOCS 8001110606 | |
| Download: ML19211C526 (2) | |
Text
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NUCLEAR REGULATORY COMM!SSION s
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AUG 3 01979 MEMORANDUM FOR:
A. Thadani, A-9 Task Manager, F.: actor Systems Branch, DSS FROM:
W. R. Butler, Chief, Containment Systams Branch, DSS
SUBJECT:
CSB REVIEW STATUS ON TAP A-9 (ATWS)
During a meeting held on August 10, 1979 in Bethesda, GE presented an outline of the methods which will be used to predict the SRV loads during an ATWS event and the difference between local end bulk pool temperature. This was tha first time that the staff has had a description of these methods. Based on our understanding of the approach used in these methods, we would anticipate an extensive review effort to properly evaluate the methods.
The following sumarizes the areas of review required for the ATWS SRV loads and pool temperature limit:
Analytical model for predicting SRV loads for BWR/4 under ATWS conditions; l.
2.
Empirical model incorporating the Caorso data base for SRV load predictions for BWR/5 and BWR/6 under ATWS conditions; 3.
Methodology for calculating local to bulk pool temperature differences for Mark I, II and III; and 4.
Justification for using initial pool temporature lower than design.
We believe that substantial manpower will be required to review the methodologies indicated above.
Further, it is our understanding that all the necessary documentation will not be available for our review until late this year. This situation causes concern with respect to both review schedule and manpower availability.
In light of these concerns, we recomend a technical meeting with GE in the near future to discuss in detail the review areas identified above.
In addition, a more definitive schedule for receipt of the r.ecessary support information should be provided by GE. With this additional infonnation, we believe that we will be in a better position to highlight potential review problems. As you are aware, the two key reviewers are Nelson Su and Larry Ruth. They also are the main contributors for Task A-39. To properly coordinate the efforts on A-39 as well as A-9, this additional information is required.
Contact:
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J T. M. Su, CSB 492-7711 s0011)[g h h
A. Thadani AUG 3 01979 Nelson Su will be available to aid in the necessary coordination to establish the meeting specifics.
i Walter R. Butler, Chief Containment Systems Branch Division of Systems Safety cc:
S. Hanauer J. Kudrick L. Ruth T. Su R. Denise
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