ML052240279

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Operating License, License Amendment Request- LAR 04-0440, Emergency Feedwater System Pump Testing Criteria
ML052240279
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 08/10/2005
From: Archie J
South Carolina Electric & Gas Co
To: Martin R
Document Control Desk, Office of Nuclear Reactor Regulation
References
LAR 04-0440
Download: ML052240279 (13)
v • d • e


Text

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Jeffrey B.Archie Vice President, Nuclear Operations

,it SCE&GOz A SCANA COMPANY August 10, 2005 803-345-4214 Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTN: Mr. Robert E. Martin

Dear Sir/ Madam:

Subject:

VIRGIL C. SUMMER NUCLEAR STATION DOCKET NO. 50/395 OPERATING LICENSE NO. NPF-12 LICENSE AMENDMENT REQUEST - LAR 04-0440 EMERGENCY FEEDWATER SYSTEM PUMP TESTING CRITERIA

Reference:

Letter from S. A. Byrne, SCE&G, to NRC Document Control Desk, dated August 24, 2004 South Carolina Electric & Gas Company (SCE&G), acting for itself and as agent for South I Carolina Public Service Authority, hereby submits a response to your verbal questions, discussed over the telephone on June 9, 2005, related to the above referenced amendment request. The LAR permits the V. C. Summer Nuclear Station to revise the test acceptance criteria for the Emergency Feedwater Pumps.

If you have any questions or require additional information, please contact Mr. Ronald B. Clary at (803) 345-4757.

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

Exed ted dn efreyB. Archie PARIJBA/mb Attachment cc: N. 0. Lorick P. D. Ledbetter S. A. Byrne K. M. Sutton N. S. Carns T. P. O'Kelley T. G. Eppink (w/o Attachment) RTS (LAR 04-0440)

R. J. White File (813.20)

W. D. Travers DMS (RC-05-0125)

NRC Resident Inspector A-1 SCE&G I Virgil (. Summer Nuclear Station P.O. Box 88

Document Control Desk Attachment LAR 04-0440 RC-05-01 25 Page 1 of 12

Subject:

LICENSE AMENDMENT REQUEST - LAR 04-0440 TECHNICAL SPECIFICATIONS 4.7.1.2

1. The SCE&G submittal states that the requested EFW pump performance requirements (3800 feet total developed head (TDH) at 90 gpm for the motor driven pumps, and 3140 feet TDH at 97 gpm for the turbine driven pump) are more conservative than the existing requirements (1600 psig discharge pressure at 90 gpm for the motor driven pumps, and 1330 psig discharge pressure at 97 gpm for the turbine driven pump). The NRC asked for further discussion of why the requested requirement is more conservative than the existing requirement.

Pump performance is function of suction pressure (Condensate Storage Tank level) if pump performance is specified as a discharge pressure (typically measured in psig), i.e. an increase in suction pressure will result in an equivalent increase in discharge pressure when a constant pump performance is assumed. Therefore, a given discharge pressure can be achieved through a range of pump performances depending on the level in the Condensate Storage Tank. A more direct method of measuring pump performance is to measure the pumps TDH (typically measured in feet of water). The suction pressure is subtracted from discharge pressure to determine TDH, thereby eliminating the influence of Condensate Storage Tank level on the indicated pump performance. Specific evaluation of the VC Summer Emergency Feedwater Pumps yields the following comparison between the original performance requirement measured in discharge pressure (psig), and the requested requirement presented in TDH (feet).

Motor Driven Pump:

If the CST is assumed to be empty (water elevation at 437 feet), then the pump suction pressure at 90 gpm is approximately 9 psig. If the CST is assumed to be filled to the overflow elevation (approximately 471 feet per Curve Book Figure Vl-12, dated 2-7-00) then the pump suction pressure would be approximately 25 psig.

Therefore, the range of TDH which could result in a 1600 psig discharge pressure is 1575 to 1591 psig or 3638 to 3675 feet. This is less than the requested requirement of 3800 feet. Therefore, the requested performance requirement is more conservative than the existing one.

Turbine Driven Pump:

If the CST is assumed to be empty (water elevation at 437 feet), then the pump suction pressure at 90 gpm is approximately 9 psig. If the CST is assumed to be filled to the overflow elevation (approximately 471 feet per Curve Book Figure Vl-

Document Control Desk Attachment LAR 04-0440 RC-05-0125 Page 2 of 12 12, dated 2-7-00) then the pump suction pressure would be approximately 25 psig.

Therefore, the range of TDH allowed by a 1330 psig discharge pressure is 1305 to 1321 psig or 3014 to 3051 feet. This is less than the requested requirement of 3140 feet. Therefore, the requested performance requirement is more conservative than the existing one.

2. South Carolina Electric and Gas utilized the Pipe-Flo software to determine the revised Emergency Feedwater Pump parameters presented in Licensing Amendment Request 04-0440. The NRC asked for further description of this software, including a discussion as to why South Carolina Electric and Gas believes that this software provides accurate results.

The requested change to the operating license is supported by analysis that utilizes a hydraulic model of the Emergency Feedwater System that was developed using the Pipe-Flo software which has been developed by Engineered Software (http://www.enq-software.com). In general, this software utilizes the methods and data contained in Crane Technical Paper 410 'Flow of Fluids through Valves, Fittings and Pipe", which is a standard reference for solving fluid flow problems. In particular, Pipe-Flo uses the Darcy-Weisbach equation to calculate pressure drops, and the Hardy Cross method of network analysis to converge on a solution.

Engineered Software has conducted and documented extensive validation testing to demonstrate that the Pipe-Flo software will accurately analyze a piping network.

Further, South Carolina Electric and Gas has also performed validation testing of the software and has found no technical errors associated with the operation of the software. South Carolina Electric and Gas considers Pipe-Flo to be "industry standard" software because it is used by many companies in a variety of diverse fields. The Engineered Software web site identifies the following companies (and many others) as being Flo-Series / Pipe-Flo users.

Power Generation & Utilities

  • American Electric Power

. Entergy

  • Exelon
  • Southern Company
  • TXU
  • West Valley Nuclear Services Engineering Design & Consultinq
  • Bechtel Corp.
  • Black & Veatch
  • Fluor-Daniel Corp

Document Control Desk Attachment LAR 04-0440 RC-05-01 25 Page 3 of 12

  • Parsons Corp.

General Industrial

  • General Electric
  • Westinghouse Aerospace & Defense
  • Los Alamos National Laboratories
  • NASA
  • Boeing
  • General Dynamics
  • Lockheed Martin Educational Institutions
  • Carnegie Mellon University
  • Purdue University
3. The NRC asked for a summary of the old and new calculations performed to determine the Technical Specification acceptance criteria for EFW pump performance. The summary was to include the assumptions, a description of the methodology and the results. The following table compares a summary of the two calculations.

Old Method New Method Assumptions 1. Pump suction pressure = 1. CST Level = 0 feet, pump suction 0 psig pressure calculated to be

2. Pump degradation is a approximately 9 psig.

constant percent of head 2. Pump degradation modeled as a loss for all flows. decrease in pump speed, so both

3. EFW flow control valves head and flow are decreased in do not leak. accordance with the affinity laws.
3. EFW flow control valves leak, therefore 5 gpm leaks by to an isolated (faulted) steam generator.

Methodology 1. Determine pump 1. Determine a composite pump curve performance requirement which is a composite of actual test (discharge pressure and data and a calculated dead head flow). point. This pump curve is below the

2. Compare performance factory curve.

requirement with factory 2. Degrade composite pump curve pump curve and observe (hypothetically reduce pump speed, percent margin available and use affinity laws to degrade (6.8%). pump curve) to develop a degraded

3. Reduce available margin composite curve that will provide

Document Control Desk Attachment LAR 04-0440 RC-05-01 25 Page 4 of 12 to allow for degradation in required flow to the steam pump speed due to generators. This step is degraded diesel generator accomplished by iteratively inserting voltage and frequency degraded composite curves into the (6.8% - 1.99% - 4%). pipe-flo model until the system

4. Reduce factory pump meets design requirements.

curve by 4%, and 3. Account for degraded diesel determine acceptance generator voltage and frequency by criteria as the discharge adjusting pump speed and thus the pressure at the pump curve.

surveillance test flow rate. 4. Insert the adjusted pump curve from step 4 into the pipe-flo model. Run the pipe-flo model with the surveillance test configuration to determine the TDH developed by the pump when design basis conditions are satisfied.

Results 1. A discharge pressure of 1. A TDH of 3800 feet at 90 gpm 1600 psig at 90 gpm (motor driven pumps), and 3140 (motor driven pumps), and feet at 97 gpm (turbine driven 1330 psig at 97 gpm pump) will allow the EFW system to (turbine driven pump) will meet design basis requirements allow the EFW system to assuming zero level in the CST, meet design basis allowing 5 gpm leakage to the requirements assuming 0 isolated steam generator and psig suction pressure and allowing for degraded diesel allowing for degraded generator voltage and frequency.

diesel generator voltage and frequency.

4. The NRC asked for the pump curves that were used in the original and new analyses.

The figure below presents the curves that were used for both the original and new evaluations of the turbine driven EFW pump. The curves for the motor driven pumps are similar.

The factory curve is the curve developed by the manufacturer at the factory (before installation in the system). This curve was used as a starting point for the original analysis.

The old Surveillance Requirement curve is the final curve generated by the original analysis. The difference between the factory Curve and the old Surveillance

Document Control Desk Attachment LAR 04-0440 RC-05-01 25 Page 5 of 12 Requirement curve was considered to be the margin in the EFW pump performance (allowable degradation). I The composite curve is the starting point for the new analysis. This curve is a conservative (low) combination of actual test data, and a calculated dead head point. This curve is considered to be conservative because it represents a level of pump performance below the factory curve. The new Surveillance Requirement curve is the final curve generated by the new analysis. This curve allows for degraded diesel generator frequency and voltage, as well as 5 gpm leakage to an isolated steam generator. It can be seen that the new Surveillance Requirement curve is more conservative (higher) than the old Surveillance Requirement curve in the region that the surveillance is conducted (below 100 gpm). The new Surveillance Requirement curve is considered to be more conservative because it requires a higher level of pump performance.

Turbine Driven EFW Pump Curves 3400.-

3200=

a,3000- f n 2800-

= 2600 -

2400 2200 0 200 400 600 800 1000 Flow (gpm)

-- l Factory Curve - Composite Curve (New)

-i- NewSurveillance Requirement OldSurveillance Requirement

5. The NRC requested further information on how TDH was determined in the surveillance test.

Document Control Desk Attachment LAR 04-0440 RC-05-0125 Page 6 of 12 Surveillance testing is performed via:

STP-220.001A (Attachment IlA calculates TDH) for Motor Driven Pump A STP-220.001A (Attachment IIIB calculates TDH) for Motor Driven Pump B STP-220.002 (Attachment VI calculates TDH) for Turbine Driven Pump.

Pertinent pages of these attachments are provided for reference.

In all cases, TDH is calculated as 2.30 X (Pd-Pi-le)

Where:

2.30 = the conversion factor between psi and feet of water at a water density typical for EFW pump testing.

Pd = discharge pressure (psi)

Pi = suction pressure (psi) le = instrument error (psi)

An instrument error of 13 psi has been calculated for mechanical gauges, An instrument error of 6.2 psi has been calculated for electronic measurement.

Note that TDH is not corrected for the difference in elevation between the suction and discharge taps. This is a conservative omission because the discharge taps are higher than the suction taps. Thus the calculated TDH is slightly less (approximately 5 feet) than the actual TDH.

Document Control Desk Attachment LAR 04-0440 RC-05-01 25 Page 7 of 12 STP-220.001A ATTACHMENT IIIA -

PAGE 1 OF 3 REVISION 8

,, - .. , ,- - -: -: . .STTS  :.'-

TRAIN A PUMP AND VALVE TEST DATA SHEET 5.1.2 Record XPP0021A, EMERGENCY FEEDWATER PUMP A,start method.

(Check the applicable box)

-] 6.4 Manual Actuation of XPPOO21A, EMERGENCY FEEDWATER PUMP A, from the' Main Control Board

-[ 6.6 K633 Train A Steam Generator Low-Low Level Relay Go Circuit Testing iI 5.5.1 The required Initial Conditions for this test have been satisfied.

I SS/CRS Signature 5.5.2 The Precautions listed inSection 2.0 have been discussed with all personnel involved in the performance of the test.

Date -.

1 SSICRS Signature Date I

- i 6.4 - Manual Actuation of XPP0021A, EMERGENCY FEEDWATER PUMP A,frow the Main Control Board No, 6.4.2.C XPPOO21B peak suction pressure -_ ' (*100 psig)

IP103522 cal due date 6.6 K633 Train A Steam Generator Low-Low Relay Go Circuit Testing 6.6.3 XPPOO21A, EMERGENCY FEEDWATER PUMP A,starts: YES- _ NO___

No1 6.6.5 XPPOO21B peak suction pressure " '_'_-_'_'___(* 100 psig) iP103522 cal due date '___ -'__ '-_

6.8.3.A Flow Calculation to convert %'Flow to GPM L"

t.i Flow'Calculation: Q=14.29 %Flow - -14.29 V_' = __ GPM 14

.i 6.8.3.E Total Developed Head Calculation:.

TDH=2.30x(Pd -Pii-13)L2. 13)= _-_1)=-_ Ft.

Calculations Performed By Signature Date Calculations Verified By:

Signature ' Date

to) 9 Uf CO)

°DO tD C STP-220.001A ATTACHMENT IIIA PAGE 2 OF 3 M 0 0 REVISION 8 STTS # M 0 00 XPPOO21A, EMERGENCY FEEDWATER PUMP A TRAIN A PUMP AND VALVE TEST DATA SHEET CD cn (GROUP A PUMP TEST)

TEST QUANTITY o - FLOW (GPM)

Convert % flow to GPM on page 1 of 3.

Pd - Pump Discharge Press (PSIG)

Pi- Pump Inlet Press (PSIG) dP - Differential Press (PSID) dP = Pd - Pi TDH Total Developed Head (Ft)

TDH = 2.30 x (Pd - Pi - 13)

VIBRATION (IN/SEC)

XPPOO21A- 7V, (PIV)

XPPOO21A - 8H, (PIH)

XPP0021A- 10V, (POV)

XPP0021A- 11H, (POH)

XPP0021A- 12A, (POA)

  • Values shown include measurement uncertainty (see Enclosure 10.1)

Document Control Desk Attachment LAR 04-0440 RC-05-0125 Page 9 of 12 STP-220.001A ATTACHMENT IIIB PAGE 1 OF 3 REVISION 8 STTS #

TRAIN B PUMP AND VALVE TEST DATA SHEET 5.1.2 Record XPPOO21 B,EMERGENCY FEEDWATER PUMP B.start method.

(Check the applicable box)

[ 6.5 Manual Actuation of XPPOO21 B,EMERGENCY FEEDWATER PUMP B, from the Main Control Board l 6.7 K633 Train B Steam Generator Low-Low Level Relay Go Circuit Testing 5.5.1 The required Initial Conditions for this test have been satisfied.

l SS/CRS Signature Date 5.5.2 The Precautions listed in Section 2.0 have been discussed with all personnel involved in the performance of the test.

I SS/CRS Signature Date 6.5 Manual Actuation of XPPOO21 B, EMERGENCY FEEDWATER PUMP B,from the Main Control Board C02 N01 6.5.2.C XPPOO21A peak suction pressure (* 100 psig)

IP103512 cal due date 6.7 K633 Train B Steam Generator Low-Low Relay Go Circuit Testing 6.7.3 XPPOO21B, EMERGENCY FEEDWATER PUMP B,starts: YES_ NO_

C02_>

N01 6.7.5 XPPOO21A peak suction pressure _ (* 100 psig)

IP103512 cal due date 6.9.3 A Flow Calculation to convert %Flow to GPM Flow Calculation: Q= 14.29 4%Flow 14.29 q = GPM 6.9.3.E Total Developed Head Calculation TDH=2.30x(Pd-Pi-13)=2.30( - -13)= Ft.

Calculations Performed By: /

Signature Date Calculations Verified By: /

Signature Date

-0)0>-)

X;r- > 0 0

CO I ;a 0) 0 CD O 0 C 3

STP-220.001A O o 3DCD ATTACHMENT 1B > J PAGE2OF3 . C 0 0

REVISION88 -i STTS # 0 XPPOO21 B. EMERGENCY FEEDWATER PUMP B TRAIN B PUMP AND VALVE TEST DATA SHEET 0 CD CO (GROUP A PUMP TEST)

TEST QUANTITY Q - FLOW (GPM)

Convert % flow to GPM on page 1 of 3.

Pd - Pump Discharge Press (PSIG)

Pl - Pump Inlet Press (PSIG) dP - Differential Press (PSID) dP - Pd - PI TDH Total Developed Head (Ft)

TDH = 2.30 x fPd - Pi - 13)

VIBRATION (IN/SEC)

XPP0021B -7V, (PIV)

XPP0021B - 8H, (PIH)

XPPOO21B - 1V, (POV)

XPP0021B -11H. (POH)

XPPOO21B - 12A, (POA)

  • Values shown include measurement uncertainty (see Enclosure 10.1)

I..

Document Control Desk Attachment LAR 04-0440 RC-05-01 25 Page 11 of 12 STP-220.002 ATTACHMENT VI PAGE 1 OF3 REVISION 7 STTS #

TURBINE DRIVEN EMERGENCY FEEDWATER PUMP AND VALVE TEST DATA SHEET 5.8.1 The required Initial Conditions for this test have been satisfied.

SSICRS Signature Date 5.8.2 The Precautions listed in Section 2.0 have been discussed with all personnel involved In the performance of the test.

l SS/CRS Signature 6.8.7.8 Flow Calculation to convert % Flow to GPM Flow Calculation: Q= 14.38 Flow = 14.38 ,F/ = GPM

- Calculation Performed By: I Signature Date Calculation Verified By: I Signature Date 6.8.7.1 Total Developed Head (TDH) Calculation:

TDH = 2.30 X (Pd - Pi - 6.2 psi)

TDH = 2.30 X ( - - 6.2 psi) = ft Calculation Performed By:.

Signature Date Calculation Verified By: I Signature Date

CDO I U C

'STP-220.002. 0 _ 0 CD =)

A1TACHMENT VI.

PAGE 2 OF 3

.REVISION7 C)0 N ~ ~ :S rrS # _ __ _

CHANGE A 0 xPP0008 TURBINE DRIVEN EMERGENCY FEEDWATER PUMP AND VALVE TEST DATA SHEET, CD (GROUP B PUMP TESTI. . . Cn 7;-

TEST QUANTITY DATA RANGES OFIST QUANTITIES INSTALLED PLANT' MEASURED REFERENCE ACCEPTBE AET RQIE CIN INSTRUMENTS Main Steam Line Pressure (PSIG) NA286P15 0 -FLOW (GPM) -Actual -107127 2 0.

Cilcuiatlon .(49.0- 51.0%) (49.0%).(40%

(1) Fiowv Uncertainty _______

N SPEED (RPM) .. A..090-~4110- . *. 4200 Pd - Pump Discharge Presis (PSIG) ____1336_2___

Pi1 Pump' Iniet Press. (-PSIG) ______

dlP - Differential Press (PSID) dP=Pd-'Pi.

Lub'e Oil Filter Outlet Press (PSIG)(2) 5->10 XPPOO08 -8H, PiH012>068 XPPOO08 -1 OV, POV>0.

XPPOO08 - II H, POH017>

XPPOOO8 - 12A. POA: .7

.(1) 98.9 -99.7 GPM are the nominal flow value percentages that Include flow measurement uncertainty.:'

(2) The acceptable range for Lube Oil Filter Outlet Press is not an IST value but does affect operability. See Step 8.3.5 and Eniclosure'10A.1.

I

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