ML20056A706
| ML20056A706 | |
| Person / Time | |
|---|---|
| Issue date: | 01/16/1990 |
| From: | Minners W NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Beckjord E NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| Shared Package | |
| ML20056A707 | List: |
| References | |
| REF-GTECI-015, REF-GTECI-NI, TASK-015, TASK-15, TASK-OR NUDOCS 9008090067 | |
| Download: ML20056A706 (3) | |
Text
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E W ASHING T ON, D. C. 20555 a
JANli 10:
MEMORANDUM FOR:
Eric S.
Beckjord, Director Office of Nuclear Regulatory Research FROM:
Warren Minners, Director Division of Safety Issue Resolution j
Office of Nuclear Regulatory Research j
SUBJECT:
APPROVED TASK ACTION PLAN (TAP) FOR GENERIC SAFETY ISSUE 15, " RADIATION EFFECTS ON REACTOR VESSEL SUPPORTS" j
I have approved the TAP for GSI-15; a copy is enclosed for your information.
As is the case with all such documents, it is subject to revision and reissue upon receipt of new relevant findings.
The work is. proceeding in response to your memorandum to R. W.
Houston, dated February 8, 1989.
1 The issue will address the concern that low-temperature, low-flux irradiation may-embrittle reactor pressure vessel (RPV) supports more rapidly than expected.
The basis for such a concern arose from a recent study of neutron radiation embrittle-ment of the ORNL High Flux Isotope Reactor RPV based on tests of surveillance samples.
It was concluded that the steel samples were embrittled more rapidly than expected, that the result was due to low-temperature, low-flux irradiation and that similar conditions might occur in RPV supports.
Additional impetus came from the ACRS.
Review of GSI-15 in the light of the new findings resulted in a reprioritization to "high" status.
- However, preliminary review by the staff failed to confirm a need for an immediate fix of the safety concern.
On the other hand, so many parameters are involved (initial material properties, response to neutron radiation, radiation parameters, design details, loads and loading rates, and others), many of which are subject to large variability, that the uncertainty in any conclusion is too large to dismiss.
Therefore, to reach a sound basis for resolu-tion of the issue will demand input from many directions.
Please note, as the TAP clearly shows, that the route to resolu-tion of GSI-15 depends on several programs beyond the immediate control of DSIR.
There are eight projects (discussed in Part C, "Related Work," of the TAP) which are ongoing or planned, each or all of which could affect the GSI-15 resolution.
The pace and direction of the eight projects depend to varying degrees on the RES budget over the next three years and thus can impact GSI-15.
DSIR, therefore, needs to be part of the decision-making process.
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jag 3 t 333 To ensure thorough coordination among the sevisral organizations and programs included in the TAP, DSIR should be part of the concurrence chain for actions involving Items 1 through 8 in Section C (pp. 10-14), GSI-15 TAP.
If you have any questions or comments, please contact me, the EIB Branch Chief or the GSI-15 Task Manager.
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' Warren Minners, Director Division of Safety Issue Resolution Office of Nuclear Regulatory Research
Enclosures:
As stated
Contact:
R. E. Johnson X23909 cc:
Carlyle Michelson, Chairman, ACRS Denwood_Ross, Deputy Director for Research, RES Lawrence C, Shao, Director, Division of Engineering, RES Themis P. Speis, Deputy Director for Issue Resolution, RES S.
Rolfe, Univ. of Kansas E.
Ripling, MTL, Chicago W. Cooper, Teledyne
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