ML12335A406

Official Exhibit - RIV000022-00-BD01 - Statement by Dr. F. Peter Ford, Transcript of January 26, 2005 Meeting of the ACRS Subcommittee on Thermal Hydraulics (January 26, 2005), at 198

ML12335A406
Person / Time
Site:	Indian Point
Issue date:	01/26/2005
From:	Advisory Committee on Reactor Safeguards
To:	Atomic Safety and Licensing Board Panel
SECY RAS
References
RAS 21600, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01
Download: ML12335A406 (5)

Text

RIV000022 United States Nuclear Regulatory Commission Official Hearing Exhibit Submitted: December 22, 2011 Entergy Nuclear Operations, Inc. EXCERPT In the Matter of:

(Indian Point Nuclear Generating Units 2 and 3) c,.",tJ"oR REGlJ<..q" ASLBP #: 07-858-03-LR-BD01

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Docket #: 05000247 l 05000286 t:~ "0 Exhibit #: RIV000022-00-BD01 Identified: 10/15/2012

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Admitted: 10/15/2012

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Withdrawn:

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~fficial r~an~clipt *~f';Proceeding~ A~BS7=5'02

. NUCLEAR REGULATORYCOMMIS$ION

Title:

Advisory Committee on Reactor Safegua*rds .

Thermal Hydraulic Phenomena Subcommittee

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Docket Number: . (not a'pplicable)

PROCESS USING ADAMS TEMPLATE: ACRS/ACNW-005

'.at:: Location: Rockville, Maryland

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SISP REVIEW COMPLETE

-'u Date: , Wednesday, January 26, 2005 '

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Work Order No.:

• NRC-194 Pages 1-364 NEAL R. GROSS AND CO., INC.

, Court Reporters and Transcribers 1323 Rhode Isla'nd Avenue, N.W. .

Washitigton, D.C. 20005 (202) 234-4433

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197 1 is provided by the licensee. And as licensee said, it 2 is more in the -- they used CHECWORKS. It's a 3 computer program that considers hydrodynamics, heat 4 balance, temperature in particular.

5 As you can see the predictive method is 6 conservative considered to actual measurement.

7 DR. FORD: I'm sorry. Could you explain 8 that?

9 MR. TSAO: Okay.

10 DR. FORD: It looks as though it's equally 11 scattered around the one to one line. So why are you 12 saying it's conservative?

13 MR. TSAO: Well, for example, you can see 14 -- let's see.

15 You can see just for example, this point 16 here the measurement is about 300 mils. The predict 17 value, let's say, from here to here is about 240 mils.

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18' So what it says is that the methodology will predict 19 that the tube wall thinner than measured, therefore it 20 also indicated that the licensee may need to do some 21 monitoring or replacement of that pipe.

22 DR. FORD: But equally there are points on 23 the other side which are not, what you call it --

24 MR. TSAO: Well, that's true. Yes, that's 25 correct. But as you know this is only a prediction.

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198 1 Predictions, hopefully -- well, from the data point 2 you can ~se'~ they are scattered t*ow~rd the conservative 3 side. And also the FAC program according to EPRI is 4 that it's a process. In other words, the licensees 5 would go out, make an inspection, UT or ultrasonic 6 measurements or the pipe thickness and then they will 7 come back and they input that data into the computer 8 code so that to make sure there is a certain accuracy 9 in their predictions.

10 Also predict that the -- in the prediction 11 method they include some safety factors.

12 DR. FORD: It seems to me as "though 13 there's a huge amount of scatter around that one-to-14 one line. And so the question immediately arises as 15 to what is the impact of that in terms of could you 16 get a through wall erosion event taking place when you 17 had predicted it would not have done so?

18 MR. TSAO: It could.

19 DR. FORD: Didyou go through that sort of 20 "what if" argument? I mean if you look at that data 21 base, you don't really have too much confidence in 22 CHECWORKS.

23 MR. TSAO: Well, I wouldn't say they would 24 be relying on CHECWORKS per se.The licensees, not 25 only waterford but other licensees, you know they NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1323 RHODE ISLAND AVE., N.W.

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199 1 ', include other factors. For example, other industry 2 experience. You know if some plants have some problem 3' , with FAC water lines, then they will consider 4 DR. FORD: I recognize that.

5 MR . TSAO: Right.

6, DR. FORD: But this particular EPU is 7 putting a lot of basis on CHECWORKS to manage this 8 problem. And if this a general observation as to how 9 good CHECWORKS is, my confidence is a little bit 10 shattered.

11 MR. TSAO: I should point out that 12 Waterford is not unique. I did the review for license 13 renewal, and I also asked questions. And this is type V 14 of plot that, you know, other licensee has shown me.

15 DR. FORD: Yes, I know.

16 MR. TSAO: In other words, I don't think 17 that licensee is depending solely on what prediction 18 is. They also, you know, include other experiences and 19 inspections. Not only the inspections for the fact, 20 but there are other SME code inspections they have to 21 perform.

22 DR. FORD: I'll ask again. Did you go 23 through the "what if" scenario?

24 MR. TSAO: I have Kris Parcziewski from my 25 branch to elaborate on this.

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200 1 DR. FORD: With that amount of uncertainty 2 in your modeling capability and therefore your 3 management capability, do you not feel uncomfortable?

4 MR. TSAO: No.

5 DR . FORD: No?

6 MR. PARCZIEWSKI: Kris Parcziewski from 7 the Chemical Engineering Branch.

8 To answer your question, those points are 9 predicted. CHECWORKS predicts but in addition there 10 is a correction factor for each individual line which 11 is here at the top right hand side, line correction 12 factor which indicates that it is corrected for each 13 individual line all the points predicted in the line 14 are corrected by this line correction factor. And the 15 line is defined as a portion of the system which has 16 the same chemistry but not necessarily the same 17 temperature. If I answer your question.

18 So all those points are already corrected.

19 Ideally, if they were ideal, they would lie in the 45 20 degree line, the middle line. However, obviously, 21 there is some scatter.

22 DR. FORD: I understand the physics --

23 MR. PARCZIEWSKI: Yes.

24 DR. FORO: of the erosion process .

25 It's highly dependent on ph. High dependent on NEAL R. GROSS COURT REPORTERS .AND TRANSCRIBERS 1323 RHODE ISLAND AVE., N.W.

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