ML13059A181

Licensee Slides for 2/28/13 Meeting Via Conference Call with Luminant Generation Company, LLC, (TAC Nos. MC4676 and MC4677)

ML13059A181
Person / Time
Site:	Comanche Peak
Issue date:	02/28/2013
From:	Seawright J Luminant Generation Co
To:	Balwant Singal Plant Licensing Branch IV
Singal B
Shared Package
ML13059A180	List: ML13059A181 ML13059A202
References
TAC MC4677, TAC MC4776
Download: ML13059A181 (17)

Text

CPNPP GSI-191 Closure February 28, 2013 1

Purpose of the Meeting

• To open plant specific discussions with the NRC regarding strainer testing The licensee will discuss the Generic Safety Issue 191 (GSI-191) pump strainer test protocols for bypass and head loss testing and related topics for Comanche Peak Nuclear Power Plant, Units 1 andd 2.

2 The Th licensee li is i considering id i a repeatt h headd lloss ttestt tto include newly identified debris source (fiberglass tape) and would like to discuss the data extrapolation methods from previous testingg to determine if the additional testing g is needed.

2

Background

• CPNPP Strainer Testing - Generic Letter 2004-02 Supplemental Response, ER-ESP-001, Rev. 2, October 13, 2009

[ML093080003/ML093080004]

• Alden Labs Prototype Strainer Flume Testing Testing, March 2006

• Alion Science and Technology Debris Transport Testing, August 2006

• Alden Labs Strainer Flume Testing, March 2008

• NRC Letter dated April 1919, 2010 [ML100950564]

• The NRC staff has no further questions for CPNPP, Units 1 and 2, at this time regarding completion of corrective actions or GL 2004-02. This conclusion is based on the staff's evaluation of your submittals, with emphasis on your responses to an NRC staff request for additional information dated July 15, 2009.

3

Background

• NEI Debris Preparation Protocol (January 30, 2012) [ML120481052 and ML120481057]

• PCI Strainer Test Protocol

• SFSS-TD-2011-001 Rev. 0, SURE-FLOW SUCTION STRAINER

- LARGE FLUME TEST PROTOCOL (LFTP) ELEMENT ISSUES &

RESOLUTION, February 13, 2012

• Plant Specific Decisions and Hold Points

• CPNPP is evaluating bypass testing in a tank versus a flume

• Contingent on a suitable test protocol and appropriate precedent 4

Comparison to Recent Testing

• Strainer Bypass Test Protocol - Tank Test Precedents

• MHI (minimal fiber, LDFG)

• STP (high fiber, LDFG)

• Others ?

• Strainer B Bypass pass Test Protocol - Flume Fl me Test Precedent

• Point Beach (Nukon, LDFG, Mineral wool, Cal-Sil, Asbestos)

• CPNPP Plant specific p debris issues ((lead blanket covers and Glass 69 tape

• Lead blanket covers were included in previous testing

• Glass 69 tape has not been tested (discovered after previous testing)

• Similar to tapes and lead blanket cover materials previously tested

• Quantity is much less than previously tested materials 5

Fibrous Debris

• Latent Fiber (surrogate - treated as Nukon)

• Low Density Fiber Glass (surrogate - treated as Nukon)

• Min Min-KK Fabric (surrogate - shredded Min-K Min K fabric)

• Lead Blanket Covers

• Glass Gl 69 T Tape ZOI Fibrous Debris Preparation: Processing, Storage and Handling,g, Rev. 1,, Januaryy 2012 (aka

( NEI Debris Preparation p

Protocol)

• Suitable for LDFG

• Not suitable for lead blanket covers, Min-K or Glass 69 tape 6

Typical - two Blanket Cover:

or three AlphaMaritex layers y of Fiberglass ib l 1x4 Lancs Fabric 40 lb high impregnated temperature with silicone l d lead rubber shielding blankets 7

WCAP-16727-NP Debris 8

Processed thru chipper/shredder 9

Headloss test - drain down without flow Test 4 Headloss 10

Headloss test - drain down complete Settled fines on top of interceptor Test 4 Headloss Tin powder and 1/64th inch paint chips can be seen 11 on the debris interceptor.

Headloss test - drain down complete Heavier debris load on bottom half Test 4 Headloss 12

Test 4 Head Loss Extrapolation Curve Exponential -

0 7497 ft 0.7497 ft.

Last 75 minutes of 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> test 13

Head Loss

• The extrapolated debris head loss for 30 days (T=2,592,000 sec) using the exponential curve fit is 0.7497 ft of water

• The maximum total strainer head loss due to the design basis debris load extrapolated to 30 days at 212 °F F is 1.55 1 55 feet feet.

• This extrapolation showed a conservative minimum NPSHa margin of 5 feet at 30 days.

• Transport testing of intact tapes and labels showed settling before the strainer.

• Head loss testing assumed 200 sq. ft. of blocked strainer (approx.

5%)

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Gl Glass 69 Tape T Scotch S t h 69 Gl Glass Cloth Electrical Tape is a white glass tape with a high temperature thermosetting silicone adhesive 15

Glass 69 Tape

• There are similarities between the Glass 69 tape and the blanket covers ((e.g.

g embedded fiber in chemical and temperature p

resistance materials)

• Comanche Peak is considering using the same debris preparation method for the Glass 69 tape as was used for the blanket covers

• An alternative could be to use an equivalent quantity of Nulkon as a surrogate for the tape

• Transport testing for blockage and head loss could be performed separately or as part of an integrated head loss test 16

Options

• Perform Bypass Testing in a Tank

• Plant specific debris issues

• Limited precedent

• Protocols critical to acceptable results

• Separate transport testing required for Glass 69 tape

• Perform Bypass Testing in a Flume

• CFD required

• Understood U d t d protocol,t l prior i experience, i iissues addressed.

dd d

• Prototypical

• Conservative

• Would include transport p and head loss testing g of Glass 69 tape

• . Questions and/or Comments?

17