NOC-AE-14003204, Response to Request for Additional Information Regarding License Amendment Request - Proposed Revision to Administrative Controls Technical Specification 6.9.1.6, Core Operating Limits Report (COLR)

Response to Request for Additional Information Regarding License Amendment Request - Proposed Revision to Administrative Controls Technical Specification 6.9.1.6, Core Operating Limits Report (COLR)

ML15008A088
Person / Time
Site:	South Texas
Issue date:	12/18/2014
From:	Rencurrel D South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NOC-AE-14003204, STI: 34026099, TAC MF4639, TAC MF4640 ALD-1161, Rev. 1
Download: ML15008A088 (19)

Text

Nuclear Operating Company South Texas Pro/ect Electric Generating StatIon PO. Box 289 Wadsworth, Teas 77483 /

December 18, 2014 NOC-AE-14003204 10 CFR 50.90 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 STPNOC Response to Request for Additional Information Regarding License Amendment Request - Proposed Revision to Administrative Controls Technical Specification 6.9.1.6, "Core Operating Limits Report (COLR)"

(TACs MF4639 and MF4640)

References:

1. Letter from G.T. Powell, STPNOC, to NRC Document Control Desk, "License Amendment Request - Proposed Revision to Administrative Controls Technical Specification 6.9.1.6, "Core Operating Limits Report (COLR)",

August 14, 2014 (ML14260A432)

2. E-mail from B.K. Singal, NRC, to L.P. Sterling, STPNOC, "Request for Additional Information (RAI) - License Amendment Request for Revision to Technical Specification 6.9.1.6 (TACs MF4639 and MF4640)", December 1, 2014 On August 14, 2014, STP Nuclear Operating Company (STPNOC) submitted a license amendment request to revise Technical Specification (TS) 6.9.1.6, "Administrative Controls Technical Specification 6.9.1.6," with respect to the revising the TS Administrative Controls section "Core Operating Limits Report (COLR)" [Reference 1]. In e-mail dated December 1, 2014 [Reference 2], the NRC requested additional information related to the STPNOC amendment request. Attachment 1 provides the STPNOC response to the Requests for Additional Information (RAI).

STI: 34026099

NOC-AE-14003204 Page 2 of 3 There are no commitments in this letter.

If there are any questions regarding this letter, please contact Rafael Gonzales at (361) 972-4779 or me at (361) 972-7867.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on 11 1LS 110 /4 D.W. Rencurrel Senior Vice President of Operations rig Attachments:

1. Response to Requests for Additional Information, License Amendment Request, Revision to Administrative Controls Technical Specification 6.9.1.6

2. STP Unit 2 Calibration Plan: 18" LEFM Meters and 18" ASME Nozzle Meters

3. Configuration sketches (SKDTM-24)

NOC-AE-14003204 Page 3 of 3 cc:

(paper copy) (electronic copy)

Regional Administrator, Region IV Steve Frantz U. S. Nuclear Regulatory Commission Morgan, Lewis & Bockius LLP 1600 East Lamar Boulevard Arlington, TX 76011-4511 Balwant K. Singal U. S. Nuclear Regulatory Commission Balwant K. Singal John Ragan Senior Project Manager Chris O'Hara U.S. Nuclear Regulatory Commission Jim von Suskil One White Flint North (MS 8 B1) NRG South Texas LP 11555 Rockville Pike Rockville, MD 20852 NRC Resident Inspector Kevin Polio U. S. Nuclear Regulatory Commission Cris Eugster P. 0. Box 289, Mail Code: MN1 16 L. D. Blaylock Wadsworth, TX 77483 CPS Energy Peter Nemeth Crain Caton & James, P.C.

C. Mele John Wester City of Austin Richard A. Ratliff Robert Free Texas Department of State Health Services

NOC-AE-14003204 Attachment 1 Attachment I Response to Requests for Additional Information, License Amendment Request, Revision to Administrative Controls Technical Specification 6.9.1.6

NOC-AE-14003204 Attachment 1 Page 1 of 1 Response to Requests for Additional Information, License Amendment Request.

Revision to Administrative Controls Technical Specification 6.9.1.6.

By letter dated August 14, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14260A432, STP Nuclear Operating Company (STPNOC, the licensee) submitted a license amendment request (LAR) for South Texas Project (STP), Units 1 and 2, for revision to Technical Specification (TS) 6.9.1.6, "Core Operating Limit Report (COLR)," with respect to the analytical methods used to determine core operating limits.

Specifically, the licensee plans to replace the existing Crossflow Ultrasonic Flow Measurement (UFM) System with a Cameron/Caldon Leading Edge Flow Meter (LEFM) CheckPlus System for measuring feedwater flow.

The NRC staff has reviewed the information provided in this application and determined that additional information is required in order to complete its review. The staff's request for the following additional information:

Test Fidelity and Test Range

• Please provide summary of planned tests representative of the STP configuration.

• Please provide summary of planned test variations to address configuration differences.

NRC Request - RAI I Please provide summary of planned tests representative of the STP configuration.

STPNOC Response:

Attached is the calibration plan for Unit 2 (Attachment 2). The calibration plan calibrates four (4)

LEFM flow measurement spool pieces in piping configurations representative of STP Unit 2, containing Feedwater Piping Loops A, B, C and D. The plan configurations model an upstream portion of the piping as outlined in the attached configuration sketches (Attachment 3).

The STP Unit 2 calibration plan is provided with this RAI response. Unit 2 is being calibrated first to support a spring 2015 installation. A similar calibration plan will be prepared to support the fall 2015 installation in Unit 1.

NRC Request - RAI 2 Please provide summary of planned test variations to address configuration differences.

STPNOC Response:

Attached is the calibration plan for Unit 2 (Attachment 2). The calibration that will be performed for STP Unit 2 regarding the LEFM units is representative of the site configuration. Due to laboratory space constraints STP Feedwater Piping Loops A and D will be calibrated in two phases.

NOC-AE-14003204 Attachment 2 Attachment 2 STP Unit 2 Calibration Plan: 18" LEFM Meters and 18" ASME Nozzle Meters

NOC-AE-14003204 Attachment 2 Page 1 of 7 Prepared by: Effective Date: Number:

David Markowski 12/17/2014 ALD-1 161 e CAM ERON Reviewed by: Page: Revision:

Don Augenstein 1 of 7 1 STP UNIT 2 CALIBRATION PLAN: 18" LEFM METERS AND 18" ASME NOZZLE METERS 1.0 PURPOSE This plan calibrates four (4) LEFM flow meters and (4) ASME nozzles in piping representative of their installation sites at the South Texas Project (STP) Nuclear Power Plant (NPP) Unit 2. The test plan models an upstream portion of the installation piping (refer to SKDTM-24). The final results are calibration coefficients'.

2.0 SCOPE This calibration plan applies to the four (4) 18" LEFMV/+ spool pieces manufactured by Cameron for the STP Unit 2 NPP. In addition the following plan incorporates the pipe models that will be employed during collection of the nozzle calibration data (in accordance with PTC-6 recommendations). The LEFM meters and nozzles shall be installed into the calibration facility in accordance with the referenced documents.

3.0 RESPONSIBILITIES 3.1 Test Facility Responsibilities An independent laboratory, Alden Research Laboratories (ARL), shall be responsible for providing calibrated equipment and test facilities for this test. In addition ARL will be responsible for the Nozzle meter calibration. The nozzles will be calibrated using a 20 point calibration in accordance with PTC-6 recommendations. In order to achieve maximum flow rates and maximum Reynolds numbers, ARL will run their flow loop at their maximum conditions allowable with respect to the model. These test conditions are expected to be in the range as noted in Table 1.

Table 1: Calibration Parameters Parameter Range Fluid Temperature 85°F to 1 10°F (varies with time)

(29°C to 43°C)

Fluid Pressure Less than 65 psig (46,000k g/m2)

Flow Rate 2000 to 16,000 gpm (450 to 3650 cubic meters/hr)

Reynolds Number 0.5 x 106 to 4.2 x 106 3.2 Cameron Responsibilities The Cameron Engineering Department shall be responsible for completing the calibration plan and documenting the results of the test. Only the latest revision of all procedures shall be used for this calibration.

3.3 Prerequisites Prior to the start of the test plan, the applicable sections of the referenced procedures shall be completed.

' Referred to as the meter factor for the LEFM and as the flow coefficient "C" for the nozzle meters.

NOC-AE-14003204 Attachment 2 Page 2 of 7 Prepared by: Effective Date: Number:

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Don Augenstein Page:

2 of 7 Revision:

1

4.0 REFERENCES

4.1 EFPOI Field Engineering Quality Control and Safety Procedure 4.2 EFP02 Control of Field Installation and Test Equipment 4.3 EFP55 LEFM Profile Factor Determination at a Flow Measurement Facility

" 25-point calibration table only 4.4 EFP68 Commissioning Procedures for LEFMV"+ C Systems

• SNRc

" Non-Fluid Delay 4.5 STP Unit 2 loops A, B, C and D Piping Isometrics References

• 7G362PFW0833, Sheet 7 Rev 0

" 7G369PFW0833, Sheet 8 Rev 6

" 7G369PFW0833, Sheet 3 Rev 6

" 7G362PFW0833, Sheet 4 Rev 1 4.6 Sketch SKDTM-24 Rev 2 4.7 Nozzle drawing 16595-01-S Rev D

NOC-AE-14003204 Attachment 2 Page 3 of 7 Prepared by: Effective Date: Number:

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Don Augenstein 3 of 7 1 5.0 CALIBRATION PROCEDURE OVERVIEW The tests require that the LEFM'/+ spool piece section be set-up in accordance with the appropriate referenced procedures (non-fluid tau only and SNRc). A single 8-path LEFM transmitter will be required to support these tests. Table 2 (following) summarizes the tests performed with a commentary as to the test purpose.

Cameron performs tests to demonstrate hydraulic insensitivity. These parametric tests perturb the model to explore the possibility of sensitivities. Cameron's approach is to radically perturb both the inlet conditions and the model components.

It is noted that if the Cameron engineer determines an alteration to the test sequence is required - then he/she reserves the right to make modifications based upon sound engineering judgment. In addition the test sequence may be altered in an effort to more efficiently perform the noted tests.

Table 2: Test Overview ASME Nozzle Calibration Overview Description Test Commentary Straight Pipe Tests A-3, D-2 (D-3) Purpose is to collect data in order to compute the sensitivity between straight pipe calibration (per ASME PTC 6) and the model calibration.

Plant Model Calibration A-1 Baseline for parametric tests (including B-i(B-3) straight pipe and changes to the inlet C-l(C-2 & C-3) conditions).

D-I Model Perturbation A-2, B-2 Upstream hydraulics changed - potentially changing swirl.

LEFM Calibration Overview Description Test Commentary Model Test (correct distance A-3, B-1, D-3 Model test for parametric comparisons between nozzle and LEFM)

Model Test (correct distance C-1 Loop C only: Model test for parametric between elbow and LEFM) comparisons Distance to nozzle/elbow A-i, B-3, C-3, Sensitivity to distance to major upstream changed D- 1 feature Upstream disturbance A-2, B-2, C-2, Sensitivity to effect of upstream sensitivity D-2 disturbances

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Don Augenstein 4 of 7 1 Table 3 provides an estimate of the test plan schedule. The plan attempts to optimize the model sequence to minimize setup time.

6.0 CALIBRATION PROCEDURE Testing will be performed on the spool pieces in the piping configurations outlined below. Testing will be done with a variety of piping configurations including a model of the system. Both pumps shall be used for all the piping configurations and all the flow rates (Note: One pump is an option for the lowest flow rates).

The laboratory shall match the model's pipe length dimensions as specified in this procedure and reference sketches within +/-2 inches (+50 mm). The pipe size and schedule of the upstream pipe that the laboratory uses shall be those specified in the attached drawings. Alternate pipe size and schedules may be used if they agree with the pipe inside diameter (for example 16 inch standard schedule has comparable inside diameters to 18 inch heavy schedule).

Note 1: For all tests, confirm flow rates at maximum flow that the lab can provide without cavitation. The laboratory may have inadequate line pressure such that the fluid might cavitate at the higher flows.

Therefore - some testing is required to determine the maximum test flow rate.

Note 2: The flows to be tested will extend from the maximum flow ARL can provide using the standard Cameron 25-point calibration method from the meter's 10:1 turndown up to the maximum available. For parametric tests - the lowest flow rates are optional or may be substituted for intermediate flow rates.

Note 3: Reference the attached sketch of the models.

6.1 Loop A Test 6.1.1 A-i Parametric test for LEFM (model configuration upstream of nozzle but LEFM is closer than in plant at 18' 10-1/2" downstream of nozzle)

A-I Model test for ASME nozzle Parametric test with LEFM spool piece transducers installed in the horizontal plane per page 2 of SKDTM-24 with a pipe extension installed off the end of the header. Distance between the nozzle discharge (item A3) and the LEFM inlet (item A4) set at 18' 10-1/2". Perform an ASME PTC-6 twenty (20) point calibration. (Test A-I reference SKDTM-24) 6.1.2 A-2 Parametric for LEFM (upstream hydraulics perturbation test)

A-2 Model test for ASME nozzle (upstream hydraulics perturbation test)

Install a 25% restriction/blockage on the bottom of the 36" header. Remainder of the piping remains the same.

6.1.3 A-3 Model test for LEFM (correct length between LEFM and nozzle)

A-3 Straight pipe test for ASME nozzle 36 Inch header is removed and nozzle installed in a straight pipe configuration. 29' 1-1/8" of pipe is between the nozzle outlet (item A3) and the LEFM inlet (item A4) - please reference test A-3 on SKDTM-24.

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Don Augenstein 5 of 7 1 6.2 Loop B Test 6.2.1 B-I Model test for LEFM B-1 Model test for ASME nozzle LEFM transducers are installed in the horizontal plane. There is 10' pipe downstream of nozzle. Perform PTC-6 twenty (20) point calibration.

6.2.2 B-2 Perturbation test for LEFM B-2 Perturbation test for ASME nozzle 25% restriction placed at the inlet to the header. All other remaining piping is unchanged.

6.2.3 B-3 Distance change between nozzle and LEFM B-3 Model test for ASME nozzle Header restriction removed and the LEFM moved downstream from the nozzle such that the distance between items B3 and B4 is 18'.

6.3 Loop C Test 6.3.1 C-I Model test for LEFM (downstream elbows)

C-I Model test for ASME nozzle LEFM transducers are installed in the horizontal plane. Perform a PTC-6 twenty (20) point calibration.

6.3.2 C-2 Parametric test for LEFM (disturbance upstream elbows)

C-2 Model test for ASME nozzle (no change)

Parametric test with 20% restriction plate installed at the inlet to the 450 elbow (item C4) with the restriction in the bottom quadrant of the pipe.

6.3.3 C-3 Parametric test for LEFM (distance to elbows changed)

C-3 Model test for ASME nozzle (no change)

Parametric test with 20% restricting orifice plate removed from joint C4 and a 3' section of piping added downstream of the 900 elbow downstream of C7.

6.4 Loop D Test 6.4.1 D-1 Parametric test for LEFM (model configuration upstream of nozzle but LEFM is closer than in plant at 15' 11-1/2" downstream of nozzle)

D-1 Model test for ASME nozzle LEFM transducers are installed in the horizontal plane. The distance from the nozzle outlet (item D3) and the LEFM inlet (item D4) will be approximately 15' 11-1/2". Perform an ASME PTC-6 twenty (20) point calibration.

6.4.2 D-2 Parametric test for LEFM (Straight pipe upstream of nozzle distances constant)

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Don Augenstein 6 of 7 1 D-2 Parametric test for ASME nozzle (Straight pipe)

Header removed and distance between nozzle outlet (item D3) and LEFM inlet (item D4) unchanged from test D-1.

6.4.3 D-3 Model test for LEFM (correct distance from nozzle)

D-3 Parametric test for ASME nozzle (Straight pipe)

Distance between nozzle outlet (item D3) and LEFM inlet (item D4) at 36' 1-1/8".

Table 3: Schedule Estimates Schedule Plan Schedule_ (Reference SKDTM-24)

Unpack and setup Loop A Commission Loop A Sunday Setup Loop B Commission Loop B (if possible)

Monday Test Test A-A-2 I

Test A-3 Tuesday Test B- 1 Test B-2 Test B-3 Wednesday Setup and Commission Loop C Test C-I Test C-2 Thursday Test C-3 Setup and Commission Loop D Test D- 1 Friday Test D-2 Test D-3 Saturday Contingency/Clean Up Sunday Contingency/Clean Up

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Don Augenstein 7 of 7 1 7.0 TEST DOCUMENTATION 7.1 The commissioning procedure shall be completed for the meter(s).

7.2 The Cameron Test Engineer shall collect all "raw" field data into one volume (directory) and index the data for each test. This data shall contain the LEFM setup data, data logs, and facility data that includes weigh tank measurements of flowrate and water temperature. Each piping component shall be listed for each test configuration (EFP55).

7.3 The Cameron Test Engineer shall collect all "on-site" data analysis sheets into one volume (directory) and index for each test.

7.4 The Cameron Test Engineer shall collect ARL temperature data and the LEFM calculated temperature, and calculated sound velocity.

7.5 The Cameron Test Engineer shall collect normalized velocity distribution (i.e., path by path velocities) and evaluate the values for the Cameron report.

7.6 The Cameron Test Engineer shall summarize the data in a report. The report shall indicate the LEFM meter factor and uncertainty for the selected location.

7.7 The Independent Laboratory, in this case ARL, shall provide a reports for the test sequence and data collected, nozzle calibration data, and a calibration record for all calibrated equipment

NOC-AE-14003204 Attachment 3 Attachment 3 Configuration sketches (SKDTM-24)

NOC-AE-14003204 Attachment 3 Page 1of5

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NOC-AE-14003204 Attachment 3 36" HEADER Page 2 of 5

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NOC-AE-14003204 Attachment 3 3" HEADER Page 3 of 5 LOOP B 520 18.00" O.D.

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NOC-AE-14003204 Attachment 3 Page 4 of 5 I

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