ML18113A598
| ML18113A598 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 11/03/1978 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7811070190 | |
| Download: ML18113A598 (4) | |
Text
e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,VIRGINIA 23261 November Mr. Darrell G. Eisenhut, Assistant Director for Systems and Projects Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Eisenhut:
Serial No. 603/101978 PO/DLB/RWC:scj Docket Nos.
50-280 50-281 License Nos.
DPR-32 DPR-37 This is in response to your letter of October 19, 1978 regarding the testing of the inside recirculation spray (IRS) pumps, the outside recircu-lation spray (ORS) pumps, and the low head safety injection (LHSI) pumps.
Our conclusions, regarding each of these pumps, are discussed below.
LHSI Pump There is absolutely no evidence of less than totally acceptable opera-tion of these pumps.
The pump manufacturer continues to judge every aspect of pump operation as excellent. Previously reported bearing/shaft wear (Unit Nos.land 2) after more than 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> of operation is equivalent to the accepted short term (48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />) test results for the modified North Anna LHSI pumps (Table 1).
The Surry LHSI pump is manufactured by the Byron Jackson Pump Company.
This pump has shown none of the unusual vibration evidenced by the original Ingersoll-Rand LHSI pumps at North Anna and Beaver Valley.
Inspection results after 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> of operation show virtually no bearing/shaft wear compared to approximately.060 to.100 inches at both North Anna and Beaver Valley after less than 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.
We see no technical justification for requiring long term testing of the LHSI pumps at Surry.
ORS Pumps We have judged the 6 day and 450 hour0.00521 days <br />0.125 hours <br />7.440476e-4 weeks <br />1.71225e-4 months <br /> tests of the modified ORS pumps at North Anna to be generic and directly applicable to the modified pumps at Surry.
As explained in our letter of July 26, 1978, our decision not to do long term testing is based on the similarity of North Anna and Surry ORS pumps. Table 2 lists design data for the North Anna and Surry ORS pumps.
There is little difference in operating conditions, performance, materials or overall dimensions.
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VIRGINIA ELECTRIC AND POWER COMPA?IY TO Mr. Darrell G. Eisenhut 2
Due to the similarily of these pumps and due to the nature of the minor differences which do exist, we consider the North Anna test results to be directly applicable to Surry.
No further testing is considered necessary.
IRS Pumps We have inspected one IRS, after approximately 60 separate pump tests in the dry condition, and found no evidence of excessive wear.
In addition we have received assurance from the manufacturer that such testing is not detrimental to pump performance.
Accordingly we have concluded that the present test methods are satisfactory. Since there has been no evidence of unsatisfactory performance we do not consider additional inspections or testing to be necessary.
Conclusion We believe that existing information and test results justify our conclusion that the LHSI, ORS, and IRS pumps will perform satisfactorily under accident conditions. Design information and inspection and test results have been forwarded in previous correspondence and summarized above.
Throughout our discussions and correspondence on this issue we have shared a common concern over the consistent disparity between the conclu-sions of our consultants and those of your staff.
We are concerned that the position of your staff may unduly reflect the views of a consulting organiza-tion whose area of expertise and theoretical emphasis may not be entirely appropriate or sufficient for the review of this issue.
We therefore request that arrangements be made for a complete review of this entire issue by an independent applications oriented consultant with specific expertise in similar pump applications.
We are eager to cooperate in any way possible toward the prompt resolu-tion of this concern and would be glad to meet with you to discuss this request.
Very truly yours, 4". /)/,£J;~lt't-u-~
C. M. Stallings Vice President-Power Supply and Production Operations
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Table l
- LHSI Pump Wear Data (Average Maximum Wear, Inches)
North Anna Unit No. 1 10 hr. operation (1)
Bearing
.060 -.100 Shaft
-.005 48 hr. test (2)
.0022
.ODll 23 day testC2)
.0032
.0017 Surry Unit Nos. 1 & 2
.002*
.001*
- bearing/shaft design diametric clearance.011 -.014, measured.011 -
.016
References:
- 1. Vepco Serial No. 554 dated December 3, 1977
- 2.
Vepco Serial No. 386 dated July 14, 1978
- 3. Vepco Serial No. 296 B & C dated July 26, and September 29, 1978.
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- Table 2 ORS DESIGN COMPARISON SURRY l & 2 NORTH ANNA 1 & 2 Manufacturer BWC BWC Type JVCR JVCR (2 stage)
(2.stage)
Speed (rpm) 1770 1770 Flow (gpm) 3500 3700 Head ( ft) 230 287 Shaft Material A564 Hll50 A564 Hll50 journal*
chrome plate chrome plate Hardness (Re)*
> 55
> 55 Finish (RMS)*
< 16 (16 Diameter (in) 2.498 2.498 Length (ft-in.)
53-10 52 (No.-length) 4, approx. 10 ft. 7, approx. 65 inches Bearing Material Inside diameter vertical separation Shaft/Bearing Design radial Clearance (in)
- following modification NiGr/c*
2.518 69"
.007-.009 NiGr/c*.
- 2.518 65 11 *
.* 007-.009