ML19208A848
| ML19208A848 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/26/1979 |
| From: | Walbridge W SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 7909180009 | |
| Download: ML19208A848 (6) | |
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- SACRAMENTO MUNICIPAt. UTILITY DISTRICT O 6201 s Street Box 15G, sacramento, california 95313; 0 16) 452-3211 7/ C -
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April 26,1979
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lluclear Regulatory Commission it'
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Attention: Mr. R. h. Engelken, Director
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Region V Office of Inspection f/
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and Enforcement 1920."crth Ca!itornia Boulevard i,4'aW,,1 Malnut Creek Plaza, Suite 202 Walnut Creek, California 94596 Docket flo. 50-312 Rancho Seco fluclear Generating Station, Unit flo. 1
Dear Mr. Engelken:
The Sacramento Municipal Utility District has reviewed IE Bulletin tio. 79-04, dated March 30, 1979. This Bulletin requests certain information regarding the analytical weights for swing check valves manufactured by Velan Engineering Corporation.
In response to
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this Bulletin, a report is attached which shows that a re-evaluation was required for only two valves. This evaluation shows that modifications are not required to the piping systems or their supports because of change:.
in valve weights.
Ue, therefore, consider no further action to be required as a result of this Bulletin.
Sincerely yours, /.' < ~
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.wh Wm. C. Walbridge U
General Manager sus
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7P107 7909180009
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RANCl!O SECO NUCLEAR gem: RATING STATION, UNIT 1 JOB NO. 12334 TASK NO.
r/ALUATION OF /dNALYTICAL WEIGHTS FOR VALVES MANUFACTURED BY VELAN ENGINEERING CORPORATION.
IN RESFCNSE TO NRC IE BULLETIN No. 79-04
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P00R RillNAL By:
D. J. Freeland April 18, 1979
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The following is presented in response to the United States Nuclear Regulatory Commission Of fice of Inspection and Enforcement IE Eulletin No. 79-04, dated March 30,1979, " Incorrect Weights for Swing Check Valves Manu-factured by Velan Engineering Corporation."
1.0 The Seismic Category I piping systems of Rancho Seco Nuclear Generating Station, Unit 1, which incorporate 3, 4, or 6 inch diameter Velan swing chach valves are listed in Table 1.
2.0 The valve weights used for the piping system dead weight and seismic analyses, the valve weights supplied by Velan, and the valve weights specified in NRC Bulletin No. 79-04 are listed in Table 2.
The Analytical values are esticates based on catalogue data or vendor supplied informa-tion.
It should be noted that the IE Eulletin va'.es are for 1500 psi valves.
3.0 Comparison of analytical valve weights with specified weights shows that reevaluation is only required for the analysis including valves SIM-002 and SIM-045.
Both valves are installed in a configuration like that shown below.
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SIM-045)
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4"-Sch. 160 A%
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In the vicinity of the valves, the maxiaum weight stress calculated by Bechtel program ME-553 is 1525 psi, the maximum seismic stress for the rigid configuration calculated by EDS Nuclear program PISOLSF is 26 psi, and the longitudinal pressure stress (4 inch sch 160 pipe at 3050 psi) is 6462 psi. The audition to the piping system of 13 lb. for weight, and 90 lb. for seismic will not significantly add to the overall stresses when compared to the allowable value of 1.2Sh = 21,360 psi (SA376 TP304 at 200F).
The adjacent pipe restraints 3U-23822-1 and 3U-23620-2 are designed for a caximum downward force of 2300 lb. and insignificant horizontal seiscic loads (less than 10 lb.).
The use of a 3 inch diameter dummy stub with 2bX2X inch shear plates is more than adequate to accomodate the added loads.
Thus, codifications are not required to the piping systems or their supports because of changes in valve weights.
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O TABLE 1.
Velan 3, 4, and 6 Inch Diameter Scismic Category I Swing Check Valves Rancho Seco Nuc1 car Cencrating Station, Unit i Vnive Size Class Line No.
Service No.
(in.)
(psi)
FWS-047 6.0 900 31823-6"-DB Aux Fced Pump to Steam Generator FWS-048 6.0 900 31920-6"-DB Aux Feed Pump to Steam Generator FWS-061 6.0 900 31820-6"-DB Aux Feed Pump to Steam Generator FWS-062 6.0 900 31821-6"-DB Aux Fced Pump to Steam Generator MSS-051 6.0 900 30804-6"-DB2 Steam Generator to Aux Feed Pump Turbine M SS-052 6.0 900 30802-6"-DB2 Steam Generator to Aux Feed Pump Turbine SIM-002 4.0 1500 23620-4"-CA Make-up Pump Discharge to RPV SIM-045 4.0 1500 23822-4"-CA H.P. Injection Pump Discharge to RPV SIM-058 4.0 1500 23820-4"-CA H.P. Injection Pump Discharge to RPV FWS-057 6.0 900 Spare tg FWS-060 6.0 900 Sparc Cl' O.{
MSS-001 3.0 600 Sparc IT YT MSS-002 3.0 600 Sparc w
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TABLE 2.
Velan Swing Check Valve Weights Rancho Seco Nuclear Generating Station, Unit 1 Pining Analysis Velen Engineering IE 79-04 Reevaluation Valve No.
Prob.
Weight Drawing No.
Weight Weight Required No.
(ib.)
(2/72)
(ib.)
(ib.)
FWS-047 76 1630 P2-0309-N-13 580 450 No FWS-048 76 1630 P2-0309-N-13 580 450 No FWS-061 80A 800 P-35150-24 445 450 No' FWS-062 92 670 P-35150-24 445 450 No MSS-051 79 445 P-35150-26 445 450 No MSS-052 79 445 P-35150-24 445 450 No SIM-002 8
133/6:i*
P-35150-17 150 135 Yes SIM-045 8
133/60' P-35150-17 150 135 Yes CC SIM-058 83 175 P-35150-17 150 135 No C
P-35150-24 445 450 7;
FWS-057 Y'
P-35150-24 445 450 FWS-060 P2-0309-N-14 90 85 MSS-001 P2-0309-N-14 90 85 MSS-002
- Dead Weight Analysis /Scismic Analysis
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