ML20206A219

Forwards Results of Testing & Insp to Confirm Adequacy of Main Steam Safety Valve Inlet Piping Configuration as Requested in Section 3.2.1.9 of NUREG-1177.Related Info Encl

ML20206A219
Person / Time
Site:	Davis Besse
Issue date:	03/31/1987
From:	Shelton D TOLEDO EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-NUREG-1177 1364, TAC-M65345, NUDOCS 8704070450
Download: ML20206A219 (12)

Text

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TOLEDO

%sEDISON DONAU) C. SHELTON vc. w ew,.r (419]249 2399 Docket No. 50-346 License No. NPF-3 Serial No. 1364 March 31, 1987 United States Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 Gentlemen:

This letter provides the results of testing to confirm the adequacy of the Davis-Besse Main Steam Safety Valve (MSSV) inlet piping configuration as requested in Section 3.2.1.9 of NUREG-1177, Safety Evaluation Report Related to Restart of Davis-Besse Nuclear Power Station, Unit No. 1, Following the Event of June 9, 1985 (Log No. 2020). This letter also provides, as requested in Section 3.2.1.9 of NUREG-1177, Toledo Edison's plan for inspecting MSSVs at each refueling outage (Attachment 1).

With regard to the inlet piping configuration, the piping inlet nozzles to the MSSVs are smaller in diameter (5.189 inches) than illustrated by the vendor drawings (6 inch minimum nating bore). A concern had been raised that the increase in flow resistance associated with the reduced inlet diameter may cause the valve's relief capacity to be lower than certified by the National Board of Boiler Inspectors (NBBIs).

To address the concern over the reduced inlet diameter, a scale model of the MSSVs was tested at the NBBIs facility on November 13, 1985. The test valve was a Number 3 Orifice Dresser Model 3737, alternately fitted with one of two different inlets, one which modeled the NBB1 certification test and one which modeled the Davis-Besse as-built plant configuration. The tests consisted of opening the valve to full lift under steam pressure and measuring the discharge by the weighed condensate method. The test results, documented in NBBI's letter dated November 22, 1985 (Attachment 2), show no difference in rated valve capacity attributable to the differ-ence in inlet configurations. For both inlet configurations, measured discharge capacities were well above rated capacity. There was less than a 1% difference in measured capacity for the two inlet configurations. The 8704070450 870331 PDR ADOCK 05000346 PDR THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEOO. OH!O 43652 at>\

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' Docket No. 50-346 4 License No. NPF-3 e

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Serial No. 1364 Page 2 i'

j test results were reviewed-by the valve vendor, Dresser Industries, who concurred in a letter dated November. 26, 1985, (Attachment 3) that the.

as-built inlet configuration does not reduce rated capacity or introduce valve chatter. The test was witnessed by the Davis-Besse NRC Resident Inspector, Mr. D. Kosloff.

Very t yours, CS:DJS:pif

//nlQ Attachments-cc: DB-l'NRC Resident Inspector A. B. Davis, Acting Regional Administrator (2 copies) i t

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Docket No. 50-346 License No. NPF-3 Serial No. 1364

-Attachment 1 ATTACHMENT 1 9

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D ckst No. 50-346 License No. NPF-3 Serial No. 1364 i Attachment 1 MSSV TESTING / INSPECTION PLAN Objectives

1. Meet or exceed the minimum requirements defined in the Davis-Besse Technical Specifications for all MSSVs.

2. Augment the testing / inspection on the valves / valve positions that 1

have had the greatest failure history.

J I 3. Define acceptance criteria for initial testing to act as a go/no go criteria for further inspection.

Minimum Refueling Testing / Inspection

1. With the plant in Mode 3 and steam pressure greater than 800 psig all the MSSVs will be inspected for visual and audible leakage. Any valve found to be leaking will be tested to verify setpoint. If the leakage persists the valve will be disassembled, inspected and repaired.

2. Setpoint will be verified on each of the 1050 psig setpoint valves and each of 1070 psig setpoint valves each refueling (eight valves total). The remaining MSSVs will be tested on an 10xN/60 (N-number of months since last refueling) frequency each refueling to assure the testing / inspection plan meets the minimum requirements of the Technical Specifications. Failures of the 1090 psig setpoint and 1100 psig setpoint valves will require additional valves to be tested. .

Failures of the 1050 psig and 1070 psig setpoint valves will not re-a quire the testingjef, additional valves.

Criteria for the "As Found" Condition i Valves with setpoints that are within 3% of desired setpoint and adjust-able will be adjusted to 1% of desired setpoint.

i Valves with setpoints that are outside 3% of desired setpoint will be d

inspected to find potential causes for the setpoint change. (Note inspection may include disassembly and internals inspection.)

Valves with leakage that persist through the testing will be inspected to determine the cause of the leakage.

1 Acceptance Criteria for "As Left" Valves Valve setpoint within 1% of desired as defined by Davis-Besse Technical Specifications.

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Dock 2t No. 50-346 r Liceitse No. NPF-3

! ~ Serial No. 1364 Attachment 2 I

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ATTACHMENT 2 l

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a.i. e u m a c.<o November 22, 1985 Toledo Edison Mr. Larry Huston 300 Madison Avenue Toledo OH 43652

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SUBJECT:

Special Test Procedure Dated October 29, 1985

Dear Mr. Huston:

On November 13, 1985, tests were conducted at the National B'ard o Testing Laboratory for the purpose of obtaining experimental operational ar.d flow data for a dresser 3737 A Special valve using two different inlet config-urations. These tests were conducted in accordance with the Special Test Procedure dated October 29, 1985 using steam as the test medium. Enclosed are copies of the test results, reported as test numbers 11,353S and 11,354S.

Several deviations to the test procedure were agreed upon on the day of the tests and are noted on the reverse of the flow test results. The flow results are repc rted on line 13 of Test Report Form B and coefficients of discharge were reported on line 15.

We hope this information will be of value to you in your work. The errer analysis requested will be forwarded under separate cover.

Yours truly, 4 f. 8S Joseph F. Ball, P.E.

Assistant Manager, ,

Pressure Relief Department I JFB/cjh Enclosures cc: Ronald Huffman, Dresser l

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NATIONAL BOARD TESTING LABORATORY

TEST REPORT FORM 8 STEAM CONDENSATE WElGHT METHOD

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A. Manufacturer. Assembler or Repair Firm 'IT)LEDO EDISO9

8. Test Numbers 11.353S ll.354S

c. Date 11-13-85 11-13-85 l

0. Vala Type Dresser 3737 ASpecial l E. Inlet Sire. In. 24 FL 24 FL i F. Outlet Size, in. 6 FL 6 FL G. Stamped Set Pressure, psic 100 100 H. Stamped Capacity. Ibsthr 13529 13529

1. ASME Code Section N/A N/A J. Va!w Serial Number SS3569 SS3569 K. Date Code - -

OBSERVED OPERATION DATA AND MEASURED DIMENSIONS L Warn Pressure, psfo - -

M. Set Pressure, psig 100.7 99.5 N. Roset Set Pressure, psig 100.0 -

O. Blowdown, pel 9.2 13.5 P. Roset Blowdown, psi -

14.0 -

c. sore Diameter. in.. (Dn) 1.802 1.802 M. Utt.L.in. .540 .540

• MEASURED TEST DATA AND RESULTS

00. Actual Discharge Area, in n. (A.) 2.550 2.550

01. Barometric Pressure, psla. (Pe) 14.3 14.3

02. Vessel Pressure. (Valve inlet), psig. (P) 110.0 110.0

03. Absoluts Vessel Pressure. psia. (P.). P, = P + Ps 124.3 124.3

04. Calortmeter Temperature. *F 308.7 307.2

05. Exhaust Pressure, ps g 0.3 0.2

08. Period of Test. minutes, m 6 6

07. Condensate weight. Ibs. tuc) 1498.4 1485.2

08. Estimated Leakage. ibsthr. (W1) Trace Trace

08. Condenser Leekage, abethr. tw2) 0.0 0.0

10. Steam Ouality percent or Dog. Supertseet. 'F 9.7* SH 8.5' SH

11. Specific Volume of Saturated Vapor 8

ft tibm. (vie) 3.6050 3.6050

12. Specific Volume at talet conditions.

ft'llbm. (v J 3.6689 3.6618

13. Rolleving Capacity. Ibsthr. Wn w,= + W1 -w2 15116 14969 -

14. Rated Capacity for Measured Set Pres . Ibsthe 14296 14296

15. Coefficient of Discharge,dimensionless.(K.)

Ke = w ,/w,. w, = theoretical capacity. Ibsthe .926 .917

16. Slope, lbsthrtpsia. (S)

S=WJPm W=51.5 x Av x Pa 16324 16324 SEE REVERSE S10E FOR MEMARMS Lab Personnet P. Brown Company Representative L. Huston J. Carvin .D. Kosloff S._F. Harrison, Jr. E. Murphy T. Tarbay J. Schults i

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11,353S 11,354S i REMARKS FOR TEST NUMBERS ,

1. The valve was tested in accordance with SPECIAL TEST PROCEDURE, DATED Oct. 29, 1985, for: Toledo Edison, with the following deviations:

, VIII. WRITTEN PROCEDURE l

3.a. Five percent (SI) blowdown tolerance omitted

4. Overpressure changed from 3% to 10%

2. Prior to testing, the following ammendment was made to the procedure;

) VI. SCOPE OF TESTING 1

Valve description: Valve type was changed from 3700-RT to 3700-T l 3. Test-Number 11,353S - Configuration 1..

4. Test Number 11,354S - Configuration 2 i

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i j l c.'rtify that the data on the reverse side of this sheet was obtained under my supervision in accordance with the provisions of ANSI /ASME PTC 25.31976, the applicable sections of the ASME Boiler and Pressure Vessel Code, and the Na-

} tional Board t.aboratory Ouality Control Manual. To the best of my knowledge and belief, the data is correct and the valves tested were of the same type and design

as indicated.

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THE NATIONAL BOARD OF BOILER Procedure No.SP 2cial Tcat Proc.

@* AND PRESSURE VESSEL INSPECTORS D C E ED BY:

Rev. O Appr-

SUBJECT:

Date October 29. 1985 Test Valve Installation Sheet 1 Drawing Date 11/15/85 Not to Scale

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Date October 29. 1985 Inlet Configuration Dimensions S 2 Drawing Date 11/15/85 Not to Scale C

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Heasured Dimensions (Inches)

Dimension Description Configuration 1 Configuration 2 A Overall length 7-1/16 7-1/8 B Throat Length 4-5/8 -

4-1/2 C Flange Face Thickness 1/4 1/4 D Flange Thickness 1-11/16 1-5/8 E Thread Length 1-3/4 1-7/8 F Throat Diameter 2.500 2.070 G Inlet I.D. Approx. 3-3/4 3-1/2

Dockst No. 50-346 License No. NPF-3 Serial No. 1364 Attachment 3 ATTAC&fENT 3

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DRESSEA INDUSTRIES INDUSTRIAL VALVE OPE RATIONS O sox 1430 DALEXANDRIA. LOUISlANA 71301 f tL. sis /seo a ano O rwx: sio osa s7ss fataxiess4aa e.4 s ts: oivio November 26, 1985 Mr. Randall Kies 300 Madison Avenue Mail Stop 3045 lbledo, Ohio 43652

Subject:

Special Testing of a 3737 Valve at The National Board on November 13, 1985

Dear Mr. Kies:

' Based on the subject test ard the data forwarded to you by The National Board on Novenber 22, 1985, the difference in the actual relieving capacities of the valve when tested with the different inlet configurations were within 1% of each other. Both relievirq capacities were greater than the stamped capacity, but were not m great as to cause chattet. Ita test data indicated that the stamped capacity of the valve was not reduced by the inlet <nnfigurations that you have under the valves.

1 Since you have identical inlet conditions for both your Q and R valves and toth the 0 ard R valves have 6" inlets, we muld expect that the 0 valve would work as well as the R ard that the capacity would not be reduced in these 0 valves either.

I trust that the above is sufficient for your needs, but should you  !

need further information, do not hesitate to call.

Very truly yours, R. A. Cedel Chief Liaison Engineer RAC/sc EXPRESS MAIL aaen *_mwwem *