ML20132E061
| ML20132E061 | |
| Person / Time | |
|---|---|
| Issue date: | 12/10/1996 |
| From: | Ali S, Guttmann J NRC (Affiliation Not Assigned), NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | NRC (Affiliation Not Assigned), NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| References | |
| NUDOCS 9612200320 | |
| Download: ML20132E061 (3) | |
Text
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UNITED STATES g
S NUCLEAR REGULATORY COMMISSION f
WASHINGTON, D.C. 20656-4001
+,*****,o i
December 10, 1996 MEMORANDUM T0:
THE FILES FRON:
Jack Guttmann, Sr. Reliability & Risk Assessment ngineer Probabilistic Risk Analysis Branch Division of Systems Technology, RES,>'gj^,p*"^
a Syed Ali, Structural Engineer Civil Engineering and Geosciences Bran A-Division of Engineering, NRR
SUBJECT:
MEETING'
SUMMARY
- MEETING WITH THE ASME RESEARCH ON NUCLEAR RISK-BASED INSERVICE INSPECTION PROGRAM Date:
November 7-8, 1996 i
location:
1828 L-Street, NW, Suite 906 Washington, DC 20036 Or> : Thursday, ~ November 7-and Friday, November >8,1996,wthe ASME-Research discussed its ongoing activities to develop risk-informed inservice inspection j
programs.
The purpose for this meeting was to discuss results from benchmark 4
calculations between the industry's and NRC's structural reliability computer code results. Good comparisons were observed for the small and large leak calculations. Some significant differences were observed for the break probability calcula~tions (see attached comparison's). Discussions focused on
~
the input parameters used in the break calculations.
Excellent comparisons were observed for the cases where leak detection was not credited. Drs.
Simonen and Bishop were requested to continue their investigations into the reasons for the differences between the industry's and NRC's calculations.
The meeting led to agreement on acceptable assumptions for welding defects (flaw density and flaw size) to be used in the analysis of failure probabilities. The NRC stated that it was in the process of quantifying the uncertainties in the calculated failure probabilities.
Discussions also focused on the proposed integration of risk calculations.
[
s During the recent months, the scope of the PRA was significantly expanded.
)9 The new scope includes calculating the consequences from a leak, a disabling leak, and a full break. The potential consequences from a leak is jet rg l impingement and spray that can disable a component or system. A disabling t
1eak is a break size that can result in:
200021 D'2 N
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J PDR ORG EPSA 4
December 10, 1996 The ASME and the NRC agreed to a conference call to discuss the status of the above activities. The conference call was scheduled for November 25, 1996 at 1:30 p.m. EST.
This meeting was publicly noticed (see Attachment).
]
Attachments:
- 1. Attendees List
- 2. Presentation Material
- 3. Public Notice Distribution:
PRAB
Subject:
File Central : Files- (T-5 C3)-
PDR WHodges BSheron MCunningham i
GBagchi MMayfield SAli DJeng SDinsmore DJackson GMillman FSimonen (PNNL)
DWhitehead (SNL)
RArt (ASME)
Document Name: G:ASMEll-7.MTG g
To r.c.i... copy or a 4.c
. i.aic i se box: c - copy without.it.chmeni/ ncio.ure
'E' = copy enclosure
'N' = No copy 0FFICE DST /PRAB lE DST /PRAB
[A/
DE/ECGB lcr DEfEC F l
pF Ilipff )
NAME JGuttmann/mb ARamey-Smith SAli GBagclii hCMingham DATE tr / is /96
/ / /,y/ /96
- / />5 /96 W/A /96 d,/ta/96 0
- FICIAL RECORD COPY (RES File Code) RES 2C and -2C-1A IRC HLE CHITIA COPY
. The ASME and the NRC agreed to a conference call to discuss the status of the above activities. The conference call was scheduled for November 25, 1996 at 1:30 p.m. EST.
Attachments:
- 1. Attendees List
- 2. Presentation Material Distribution:
PRAB
Subject:
File Central Files (T-5 C3)
PDR WHodges BSheron MCunningham GBagchi MMayfield SAli DJeng SDinsmore DJackson GMillman FSimonen (PNNL)
DWhitehead (SNL)
RArt (ASME)
Document Name: G:ASME11-7.MTG Ta receive a copy of this document, inshcate in the box: "C" = copy without attachment / enclosure
'E' = copy with attachment /enclosurc
'N' = No copy 0FFICE DST /PRAB lE DST /PRAB ()#f u DE/ECGB E
DE/ECGB l
DST:PRAB l
NAME JGuttmann/mb ARamey-Smith SAli.44-/l GBagchi MCunningham DATE
/s / /5"/96 M /s//96
// //5 /96
/ /96
/ /96 0:FICIAL RECORD COPY (RES File Code) RES 20 and -2C-1A