ML20106H143

Informs That Upon Review of Attachment B of Util , Submitting Facility SG Interim Plugging Criteria 90 Day Rept,Listed Info Found Missing.Missing Info Encl

ML20106H143
Person / Time
Site:	Braidwood
Issue date:	03/08/1996
From:	Tulon T COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ED-96-0210-BRW, ED-96-210-BRW, NUDOCS 9603200264
Download: ML20106H143 (5)

Text

. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

~N g Commonwealth Edison

/ Braidwcod Nuclear Power Station

\\ T 7 Route #1, Box 84

\\

/ Braceville. liknois 60407 Telephone 815/458 2801 March 8,1996 ED-96-0210-BRW Document Control Desk Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Braidwood Station Unit 1 Steam Generator Interim Plugging Criteria 90 Day Report NRC Docket No. STN 50-456

References:

1. March 5,1996 letter from T. J. Tulon to Nuclear Regulatory Commission, Braidwood Station Unit 1 Steam Generator Interim Plugging Criteria 90 Day Report.

2. NRC Generic Letter 95-05, Voltage-Based Repair Criteria for Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Corrosion Cracking.

In Reference 1, Braidwood Station submitted the 90 Day Report as required by Reference 2. Further review of Attachment B of Reference 1, found the following information missing:

1. Table 3-8, containing the tabular form of the non-destructive examination uncertainty distribution used in predicting the end-of-cycle voltage distribution. This information is discussed in Section 3.3 of Reference 1 Attachment B.

2. Figure 3-7, containing the graphical form of the voltage distribution for indications left in service at the beginning of the next operating cycle that were confirmed by a Rotating Pancake Coil (RPC) probe or not RPC inspected. The data for this graph can be obtained from Table 3-1 of Reference 1 Attachment B.

3. Figure 3-8, containing the graphical form of the non-destructive examination uncertainty distribution used in predicting the end-of-cycle voltage distribution. This information is discussed in Section 3.3 of Reference 1 Attachment B.

These tabular and graphical forms are required to be in the 90 Day Report per Section 6.b l

of Reference 2.

j gh TQPP99 9603200264 960308 PDR ADOCK 05000456 P

PDR

\\

l l

Please direct any questions regarding this submittal to Doug Huston, Braidwood Licensing Supervisor, (815) 458-2801, extension 2511.

Very truly yours,

. J. T Station Manager Braidwood Station TJT/LA/gtv-Attachments l

cc:

Senior Resident Inspector - Braidwood Braidwood Project Manager, NRR Regional Administrator-RIII l

l l

l l

Table 3-8 Probe Wear and Analyst Variability - Tabulated Values Analyst Variability IYobe Wear Variability Std. Dev = 10.3%

Mean = 0.0%

Std. Dev = 7.0%

Mean = 0.0%

No Cutoff Cutoff at +/- 15%

Value Cumul.14ob.

Value Cumu!.14ob.

-40.0%

0.00005

< -15.0%

0.00000 38.0 %

0.00011

-l 5.0%

0.01606

-36.0%

0.00024

-14.0%

0.02275 34.0 %

0.00J48

-13.0%

0.03165

-32.0%

0.00095

-12.0%

0.04324

-30.0%

0.00179

-11.0%

0.05804

-28.0%

0.00328

-10.0%

0.07656

-26.0%

0.00580

-9.0%

0.09927

-24.0%

0.00990

-8.0%

0.12655

-22.0%

0.01634

-7.0%

0.15866

-20.0%

0.02608

-6 0%

0.19568

-18.0%

0.04027 5.0%

0.23753

-16.0%

0.06016

-4.0%

0.28385

-14.0%

0.08704

-3.0%

0.33412

-12.0%

0.12200

-2.0%

0.38755 10.0 %

0.16581 1.0%

0.44320

-8.0%

0.21867 0.0%

0.50000

-6.0%

0.28011 1.0%

0.55680

-4.0%

0.34888 2.0%

0.61245

-2.0%

0.42302 3.0%

0.66588 0.0%

0.50000 4.0%

0.71615 2.0%

0.57698 5.0%

0.76247 4.0%

0.65112 6.0%

0.80432 6.0%

0.7I989 7.0%

0.84134 8.0%

0.78133 8.0%

0.87345 10.0 %

0.83419 9.0%

0.90073 12.0 %

087800 10.0 %

0.92344 14.0 %

0.912 %

11.0 %

0.94196 16.0 %

0.93984 12.0 %

0.95676 18.0 %

0.95973 13.0 %

0. % 835 20.0 %

0.97392 14.0 %

0.97725 22.0 %

0.98366 15.0 %

0.98394 24.0 %

0.99010

> 15.0%

1.(KOOO 26.0 %

0.99420 28.0%

0.9 % 72 30.0 %

0.99821 32.0 %

0.99905 34.0 %

0.99952 36.0 %

0.99976 38.0%

0.99989 40.0 %

0.99995

Figure 3-7 l

Braidwood Unit-1 October 1995 Outage Bobbin Voltage Distribution for Tubes Retumed to Service Confirmed by RPC or Not RPC Inspected 180 I

160 5SG-A 140 OSG-B E

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