ML20049J545

Forwards Response to Questions Raised by Seismic Qualification Review Team on 820125

ML20049J545
Person / Time
Site:	Grand Gulf
Issue date:	03/12/1982
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20049J546	List: ML20049J545 ML20049J547 ML20049J549 ML20049J550 ML20049J551 ML20049J553 ML20049J555 ML20049J559
References
AECM-82-95, NUDOCS 8203180335
Download: ML20049J545 (6)

Text

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MISSISSIPPI POWER & LIGHT COMPANY

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m edBAnddu Helping Build Missi.ssippi P. O. B O X 164 0, J AC K S O N, MIS SIS SIP PI 3 9 2 05 March 12, 1982

\m I ik %g Mn E AR PHODUcDoN (X PARTMF NT p U. S. Nuclear Regulatory Commission ,

, #) C Office of Nuclear Reactor Regulation 9 . -

Washington, D. C. 20555 2 ,,7 9 O '3 Attention: Mr. Harold R. Denton, Director Uh ~

Dear Mr. Denton:

\

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416 and 50-417 File: 0260/L-814.1/M-001.0 Re: AECM-82/95 Response to Seismic Qualification Review Team Questions AECM-82/74 Mississippi Power & Light Company (MP&L) is providing the following information in response to <1uestions raised by the Seismic Qualification Review Team (SQRT) during a telephone confe.;nce call on January 25, 1982.

This information is also in support of concerns identified in the rand Gulf Safety Evaluation Report as Outstanding Issue 1.9(6).

1. Concern Provide the following information in regard to computer code "F-1":

a) Description of GE Computer Code SAP 4G07 b) Mathematical model used during finite element analysis

Response

The following information is provided: O O)

Attachment 1: FSAR Pages 3.9-8 & 3.9-17; describes SAP 4G07 as a verified ,g GE computer code. j Attachment 2: NED0-10909, GE SAP 4G07 user's manual; describes how to use //

the GE SAP 4G07 computer code. ged, Attachment 3: Finite Element Analysis; describes the mathematical model l,8,

usedbyGEtoperformthefiniteelementanalysisonthe(,n/Yo*

fuel transfer system hatch. PDZ LPDA.

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2. Concern pJ 7tS VM Provide the following information for control room panel H13-P601: gqg a) copy of DRF # A00-696 b) copy of FDDR implementing field fix on controller F.h h

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Member Middle South Utilities System L

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AECM-82/74 MIIISSIPPI POWER Q LICHT COMPANY Pago 2

Response

The following information is provided:

a) Attachment 4: FDDR # JB1-1644, Rev. 0; Field fix of Controller E51-R600. H13-P601.

b) DRF # A00-696; k'yle Test Report #58459, " Seismic Testing of Two Reactor Mode Switch Assemblies".

DRF # A00-696 is considered by the General Electric Company to be proprietary information. As such, DRF

1. A00-696 is being provided under separate cover to the NRC in Mississippi Pcwer & Light Company Ictter AECM-82/95.

3, concern Issue concerns the pressure indicator switch Model No. 510DU237028. The NRC ir dicated that their review of Environ Laboratories Engineering Report No. 8849 test results showed that the test unit was returned to Rosemount Inc. for further evaluation. NRC reviewer asked (1) why was the test unit sent back to Rosemount after the ll-g vibration test and (2) what did Rosemount do with the returned units.

Response

Attachment 5 provides MP&L's response to the questions raised by SQRT.

4. Concern Issue concerns the RHR solenoid valve Model No. 75GG001. The NRC reviewer asked that in view of the fact that several natural frequencies below 33 Hz were found, how do we address multi-mode and multi-frequency concerns in the report as the tests performed were single frequency and single axis.

Response

Attachment 6 provides MP&L's response to the question raised by SQRT.

5. Concern Provide information on modification made to Limitorque Actuators for hydrodynamic loads.

Response

Limitorque Test Report B0084 is provided as Attachment 7.

Attachment 7 contains a picture of the modified seismic bracket for the Limitorque actuators as well as a copy of Test Report No. B0084. The only Limitorque actuators requiring modification for seismic consideration are the SMB/HBC models mounted on Henry Pratt butterfly valves (Specifications 9645-M-257.0/M-258.0) which are subjected to hydrodynamic loads. Per Limitorque Test Report No. B0084 (includes Acton Lab. Report No. 15780),

r AECM-82/74 MICCISSIPPI POWER O LICHT COMPANY Prge 3 special high frequency brackets were installed prior to testing to replace the stock bracket which connects the motor and gear box. The actuators successfully passed the hydrodynamic loads vibration testing. The Limitorque actuators for gate and globe valves (specifications 9645-M-242.0 and 9645-M-251.0) did not require modification and successfully passed the hydrodynamic loads vibration testing. This is documented in Limitorque Test Report No. B0085 (includes Acton Lab Report No. 15780-1).

6. Concern HPCS Service Water Pumps. Specification No. 9645-M-087.0. The SQRT personnel raised questions in regard to the methodology used in performing the analysis on the HPCS service water pump.

Response

The following information and actions have been taken:

a) A conference call between the NRC, Nutech, Bechtel and MP&L was held on February 2, 1982.

b) The conference call resulted in the conclusion that the HPC3 service water pump was qualified.

c) The NRC requested technical information on the HPCS service water pump be provided to them in order they may make an independent review of the analysis, d) Attachment 8 provides general information on the HPCS service water pump.

e) Proprietary arrangement has been worked out between the NRC and Could in order for the NRC to obtain proprietary shop drawings and informa-tion from Could Pump, Inc.

f) MP&L has forwarded a letter to Gould requesting the proprietary information be sent to the NRC.

7. Concern MP&L committed to stiffen the 40 MW fan support channels with bracing to eliminate the potential for low frequency. The NRC requested they be provided with a copy of the design used to stiffen the 40 MW fan and also a copy of the analysis that was performed to verify the design.

Response

A copy of the design and analysis for the 40 MW fan modification is provided as Attachment 9.

8. Coacern MP&L committed to strengthening the ASCO Solenoid Valve mounting plates.

The NRC requested they be provided with a copy of the design used to strengthen the mounting plates and also a copy of the analysis that was performed to verify the design.

. . o AECM-82/74 MISSISSIPPI POWER O LICHT COMPANY Pags 4

Response

Copies of the Field Change Notices (FCN) for strengthening the ASCO Solenoid Valve Mounting plates are provided as Attachment 10. MP&L will forward to the NRC SQRT a copy of the analysis performed on the design change implemented by the FCN's in Attachment 10 by April 15, 1982.

If you have any questions or require further information, please contact this office.

Yours ly,

/ '

-/

kg-L. F. Dale

/ Manager of Nuclear Services RAB/Silli/JDR: rg Attachments: 1. FSAR Pages 3.9-8 and 3.9-17

2. CE SAP 4G07 Computer Code User's Manual (NED0-10909)

3. Finite Element Analysis Model

4. FDDR # JB1-1644

5. Response to Pressure Indicat6r Switch Questions

6. Response to RHR Solenoid Valve Questions

7. Limitorque Test Report L0084

8. HPCS Service Water Pump Technical Information

9. 40 MW Fan Modification Design and Analysis

10. ASCO Solenoid Valve Mounting Plate Field Change Notices cc: Mr. N. L. Stampley (w/o)

Mr. R. B. McGehee (w/o)

Mr. T. B. Conner (w/o)

Mr. G. B. Taylor (w/0)

Mr. Richard C. DeYoung, Director (w/o)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Attacilment 1 to AECll-82/74 gg .

FSAR 3.9.1.2 Computer Programs Used in Analysis 3.9.1.2.1 Computer Programs used for NSSS Equipment The following subsections discuss computer programs used in the analysis of specific components. (Computer programs were not used in the analysis of all components; thus, not all compo-nents are listed.)

The NSSS programs can be divided into two categories:

GENERAL ELECTRIC (GE) PROGRAMS The verification of the following GE programs has been per-formed in accordance with the requirements of 10 CFR 50, Appendix B. Evidence of verification is documented in GE Design Record files.

(a) SEISM (m) TSFOR (b) STRESINT (n) LUGST (c) MASS (o) PDA 4

(d) DYSEA (p) PISYS (e) HEATER (q) SAP 4G m

(f) FAP-71 (r) WBHFN y 53 (g) CREEP-PLAST (s)~ ED-6 ,F.

e .

(h) ANSYS (t) ED-8 H l w

(i) ASSIST (u) GEAPL (j) CRDSS (v) SPECA (k) ANSI (u) ASHSD (1) (v)

RVFOR FTFLG VENDOR PROGRAMS The verification of the following vendor programs is assured by contractual requirements between General Electric and the vendors. Per the contractual requirements, the verification of these proprietary programs used in the design of N-stamped equipment is in full compliance with 10 CFR 50, Appendix B.

Byron-Jackson Program Recirculation Pump Amend. 53 1/82 3.9-8

<~ ' ~

gg FSAR pump casing for the various loading conditions imposed by thermal and mechanical loads during plant operating and postulated conditions.

In general, the finite element techniques are used to solve temperature distribution heat transfer transient' analysis problems, and to perform stress analysis for various thermal and mechanical loadings by using the same finite element model

. representing the pump body. The output of this program is in the form of temperature profiles, deflections, and stresses at the modal points of the finite element idealization of the pump structure.

- Accuracy of the computer program methods is demonstrated by comparison with selected sample problems which lend themselves to alternate computation methods to provide closed-form analytical solutions.

3.9.1.2.1.5 ECCS Pumps and Motors The following are the computer programs used in the dynamic analysis to ensure the structural and functional integrity of the ECCS pumps and motor assemblies.

53 3.9.1.2.1.5.1 Structural Analysis / SAP 4G SAP 4G is used to analyze the structural and functional integ-rity of the ECCS pump / motor systems. This is a general struc-tural analysis program for static and dynamic analysis of linear elastic complex structures. The finite element dis-placement method is used to solve the displacements and stresses of each element of the structure. The structure can be composed of an unlimited number of three-dimensional truss, beam, plate, shell, solid, plate strain-plane stress and spring

elements that are axisymmetric. The program can treat thermal and various forms of mechanical loading. T 'he dynamic analysis includes mode superposition, time-history, and response spectrum analysis. Seismic loading and time-dependent pressure can be treated. The program is versatile and efficient in analyzing large and complex structural systems. The output contains displacements of each nodal point as well as stresses at the surface of each element.

3.9.1.2.1.5.2 Effects of Flange Joints Connections /FTFLG The flange joints connecting the pump bowl casings are analyzed using~FTFLG. This program uses the local forces and moments l

l l

Amend. 53 1/82 l 3.9-17 l