ML14058A083: Difference between revisions

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| author name = Aird D
| author name = Aird D
| author affiliation = NRC/RES/DRA
| author affiliation = NRC/RES/DRA
| addressee name = Ferrante F J
| addressee name = Ferrante F
| addressee affiliation = NRC/NRR/DRA
| addressee affiliation = NRC/NRR/DRA
| docket = 05000269, 05000270, 05000287
| docket = 05000269, 05000270, 05000287
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=Text=
=Text=
{{#Wiki_filter:qFerrante, FernandoFrom:Sent:To:Cc:
{{#Wiki_filter:q Ferrante, Fernando From:                       Aird, David  '[--  j Sent:                       Friday, January 13, 2012 1:25 PM To:                         Ferrante, Fernando Cc:                         Perkins, Richard


==Subject:==
==Subject:==
Aird, David '[-- jFriday, January 13, 2012 1:25 PMFerrante, FernandoPerkins, RichardRE: GI-204 Dam Failure Comm. Plan AnswerFernando, Thanks for taking a look at my various responses.
RE: GI-204 Dam Failure Comm. Plan Answer Fernando, Thanks for taking a look at my various responses. I agree that we are converging on the same answer and now understand why not to take ownership of the IPEEE responses especially considering the questionable numbers assigned to dam failures.
I agree that we are converging on the same answer andnow understand why not to take ownership of the IPEEE responses especially considering the questionable numbers assigned to dam failures.
-.. r)*vid______________________
-..
naviri Outside of Scope In the Oconee Nuclear Station     su mi
naviriOutside of ScopeIn the Oconee Nuclear Station su mi/icensee estimated the im-pact from flooding due to failure of a large upstream dam but also concluded that it this is alow probability event and, therefore, did not pose a severe accident vulnerability.-
    /icensee estimated the im-pact from flooding due to failure of a large upstream dam but also concluded that it this is a low probability event and, therefore, did not pose a severe accident vulnerability.-
Outside of Scope On Oconee, one of the confusions on what the dam frequency represents is that the licensee parsed failuremodes by separating seismic and treating the probability of failure due to overtopping individually (using limitedhydrologic data). This approach came from an earlier PRA study effort titled NSAC-60, specific to Oconee. Thefailure modes which the licensee included were primarily embankment piping and foundation failures with avery narrow focus on dams that met the same characteristics of Jocassee Dam, resulting in a lower value thanwould generally be obtained by using dam failures from all failure modes and years of operations of thegeneral large dam population (which is how they derived the value listed in the IPEEE, which again was basedon NSAC-60 approach).
Outside of Scope
Outside of Scope  
 
: Richard, "Thanks,David AirdReliability and Risk EngineerRES/DRA/PRB (301) 251 -7926Mailstop:
On Oconee, one of the confusions on what the dam frequency represents is that the licensee parsed failure modes by separating seismic and treating the probability of failure due to overtopping individually (using limited hydrologic data). This approach came from an earlier PRA study effort titled NSAC-60, specific to Oconee. The failure modes which the licensee included were primarily embankment piping and foundation failures with a very narrow focus on dams that met the same characteristics of Jocassee Dam, resulting in a lower value than would generally be obtained by using dam failures from all failure modes and years of operations of the general large dam population (which is how they derived the value listed in the IPEEE, which again was based on NSAC-60 approach).
CSB-4CO7M Location:
Outside of Scope
04-C25:3}}
 
Richard, "
: Thanks, David Aird Reliability and Risk Engineer RES/DRA/PRB (301) 251 - 7926 Mailstop: CSB-4CO7M Location: 04-C25
:3}}

Latest revision as of 08:42, 4 November 2019

Email from D. Aird, RES to F. Ferrante, NRR GI-204 Dam Failure Comm. Plan Answer
ML14058A083
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 01/13/2012
From: David Aird
NRC/RES/DRA
To: Ferrante F
NRC/NRR/DRA
Shared Package
ML14055A421 List: ... further results
References
FOIA/PA-2012-0325
Download: ML14058A083 (3)
v • d • e


Text

q Ferrante, Fernando From: Aird, David '[-- j Sent: Friday, January 13, 2012 1:25 PM To: Ferrante, Fernando Cc: Perkins, Richard

Subject:

RE: GI-204 Dam Failure Comm. Plan Answer Fernando, Thanks for taking a look at my various responses. I agree that we are converging on the same answer and now understand why not to take ownership of the IPEEE responses especially considering the questionable numbers assigned to dam failures.

-.. r)*vid______________________

naviri Outside of Scope In the Oconee Nuclear Station su mi

/icensee estimated the im-pact from flooding due to failure of a large upstream dam but also concluded that it this is a low probability event and, therefore, did not pose a severe accident vulnerability.-

Outside of Scope

On Oconee, one of the confusions on what the dam frequency represents is that the licensee parsed failure modes by separating seismic and treating the probability of failure due to overtopping individually (using limited hydrologic data). This approach came from an earlier PRA study effort titled NSAC-60, specific to Oconee. The failure modes which the licensee included were primarily embankment piping and foundation failures with a very narrow focus on dams that met the same characteristics of Jocassee Dam, resulting in a lower value than would generally be obtained by using dam failures from all failure modes and years of operations of the general large dam population (which is how they derived the value listed in the IPEEE, which again was based on NSAC-60 approach).

Outside of Scope

Richard, "

Thanks, David Aird Reliability and Risk Engineer RES/DRA/PRB (301) 251 - 7926 Mailstop: CSB-4CO7M Location: 04-C25
3
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