ML061220456

Attachment 1 to Comanche Peak Conference Call

ML061220456
Person / Time
Site:	Comanche Peak
Issue date:	05/18/2006
From:	Office of Nuclear Reactor Regulation
To:
Thadani M, NRR/DLPM, 415-1476
References
Download: ML061220456 (4)

Text

IRF11 NRR S/G Conference Call Specific Questions

1.

Discuss whether any primary to secondary leakage existed in this unit prior to shutdown.

• None to date.

2.

Discuss the results of secondary side pressure tests.

• Secondary Side pressure tests are not scheduled to be performed in lRFI 1.

3.

For each SG, provide a general description of areas examined, including the expansion zriteria utilized and type of probe used in each area. Also, be prepared to discuss your inspection of the tube within the tubesheet, particularly the portion of the tube below t:,e expansion/transition region.

The following is the base scope inspection plan for the IRF1I1 outage in Octob r 2005. Expansion of the inspection will be based on Tech Spec and EPRI guideline criteria. Inspection will be performed in all four SGs and the inspection scope is the same in all four:

1) 100% full length 0.61" bobbin examination in Rows 3 and greater and 100% 0.61" bobbin inspection in the hot and cold leg straight sections of Rows I and 2

2) 100% +Pt examination of hard rolled tubes at the hot leg top of tubesheet (ITS +/- 3")

3) 100% +Pt inspection of WEXTEX tubes at the hot leg tubesheet (TTS +3" thru tube end hot)

4)

U-bend mid-range +Pt examination of 100% of the tubes in rows 1 through 16

5) 25% +Pt examination of tubes expanded at cold leg baffles B (C2) and D (C3)

6)

+Pt examination of dents, regardless of voltage, at AVB locations (+/-

1.0")

7)

Rotating probe examination of mixed residuals (> 1.5 volts as measured by bobbin) and hot leg dented intersections > 5 volts (as measured by bobbin) according to the requirements of GL 95-05

8)

Rotating probe examination of preheater baffle plate indications and freespan bobbin coil indications for flaw confirmation and characterization

9) 100% +Pt inspection of all dented TSP intersections at the H3 TSP > 2 volts

10) 20% +Pt inspection of freespan dings > 2 volts and < 5 volts between TSH andH3

11) 100%7 +Pt inspection of freespan dings > 5 volts Attachrent 1

12) 20% +Pt freespan paired ding inspection between the top 2 TSPs (hot &

cold legs)

13) 20% +Pt inspection of TIG sleeves installed in IRF09 (inspection extent should be +/- 3' from sleeve ends including TIG weld, expansion in tUbesheet, and the full length in between)

14)

Full length inspection of 100% of the TIG sleeves installed in IRF09 using 0.54 inch diameter bobbin probe to look for restriction (collapse or partial collapse) in the sleeve

15) 100% +Point inspection of Alloy 800 sleeves installed in IRFIO (inspection extent should be +1-3" from sleeve ends including expansion in tubesheet, highest expansion in the freespan, and the full length in between)

16)

+Pt inspection of the hard rolled tubes selected for the installation of Alloy 800 sleeves during IRFI1, if any, in the region of lower roll joint (ITS -

7.0" to -10.0") to confirm that the tube is defect free at this location

17)

Base line +Pt examination of all A800 sleeves installed (if any) during IRFIl 1

18) 100% tube plug video inspection in accordance with site desktop instruction

19)

Tube bundle secondary side video inspection including a limited scope TTS in-bundle inspection and FOSAR at TTS and cold leg baffle plate 13

4.

I)iscuss any exceptions taken to industry guidelines.

No exceptions to industry guidelines have been taken and none are planned.

5.

Provide a summary of the number of indications identified to-date of each degradation mode and SG tube location (e.g., tube-support-plate, top-of-tubesheet, etc.). Also provide information, such as voltages, and estimated depths and lengths of the most significant indications.

• Later

6.

Describe repair/plugging plans for the SG tubes that meet the repair/plugging criteria.

a All crack-like indications, sizable wear greater than 40% at AVBs and baffle plates will be plugged. Also, sizable loose part wear greater than 40% or loose parl wear less than the repair limit and the loose part can not be removed in all areas will be plugged. Depending on the number of TTS repairable indications A800 sleeves will be installed in lieu of plugs.

7.

Discuss the previous history of SG tube inspection results, including any "look backs" performed, specifically for significant indications or indications where look backs are used in support of dispositioning (e.g., manufactluring burnish marks).

History look-ups are performed for all AVB and preheater wear, DFI, MBI, NQI, PLI, DSI, LPI, DE1 DT1, FSD and DNI calls. History lookups are performed by both resolution analyst teams. History look-tips at CPSES are back to the first ISI.

8.

Discuss, in general, new inspection findings (e.g., degradation mode or location of degradation new to this unit).

Later

9.

Discuss your use or reliance on inspection probes (eddy current or ultrasonic) other than bobbin and typical rotating probes, if applicable.

R No other probes are planned for use to disposition indications.

10.

Describe in-situ pressure test plans and results, if applicable and available, including tube selection criteria.

4 Tube selection for in situ testing will follow the methodology prescribed by the EPiJI guideline.

11.

1)escribe tube pull plans and preliminary results, if applicable and available; include tube selection criteria.

it No tube pulls are planned.

12.

Discuss the assessment of tube integrity for the previous operating cycle (i.e., condition monitoring).

• Assessment of tube integrity for the current operating cycle (cycle 11) will follow a methodology consistent with the EPRI tube integrity guideline.

13.

Provide the schedule for SG-related activities during the remainder of the current outage.

• All activities as listed in response to question 3 during the period 10/12 -10/29.

14.

Discuss the following regarding loose palts:

a)

What inspections are performed to detect loose palts, Annulus and Tubelane of the TTS of all 4 SG's.

T-Slot and annulus region of B Baffle Plate (C2) for all 4 SG's.

In-bundle of TTS in response to +Pt inspection (100%).

As applicable response to +Pt inspection of B BP (25%).

U)

Describe if any loose parts were detected and their location within the SG, Later c)

If loose parts were removed from the SG, Later II)

Indications of damage associated with loose parts, and Later The source or nature of the loose parts if known.

Later

15.

Discuss any changes to data analysis guidelines that will be implemented during the outage.

Beyond selected enhancements and clarifications no data analysis guideline changes are currently planned.

16.

Describe any actions (e.g., training) that have been implemented to ensure the quality of the data analysis and resolution will be as high as that ultimately reached during the last outage

'IRFI0).

Actions and training enhancements implemented during IRFIO are canied over into the IRF1 I outage. For example, analysts will be specifically instructed to closely scrutinize freespan regions using all differential and absolute channels and that a voltage threshold for reporting will not be applied.

17.

])escribe any plans for inserting 'Judas' ('cobra') tubes into the data stream.

Ad There are no plans to insert 'Judas' ('cobra') tubes into the data stream in IRFJ 1.