ML18142A036
| ML18142A036 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 08/17/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML18130A402 | List: |
| References | |
| 367, NUDOCS 8408240280 | |
| Download: ML18142A036 (4) | |
Text
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VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 W. L. STEWART VICE PRESIDENT NucLEAR OPERATIONS August 17, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen:
Serial No. 367 NO/DWL,RCB:acm Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION ADDITIONAL INFORMATION REGARDING 12/9/83 ASME SECTION XI RELIEF REQUEST In your letter of June 6, 1984, you requested that Vepco provide additional information in order to complete your review of Vepco's ASME Section XI relief request submitted for Surry Units 1 and 2 dated December 9, 1983 (Serial No.
647).
The requested information is provided as an attachment to this letter.
If you require any additional information or clarification on the attached information, please contact us at your convenience.
cc:
Mr. James P. O'Reilly Regional Administrator USNRC, Region II Mr. D. J. Burke NRC Resident Inspector Surry Power Station vl!JZn4u~s, W. L~
l
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e ADDITIONAL INFORMATION REQUESTED ASME SECTION XI RELIEF REQUESTS SURRY UNITS 1 AND 2 DATED 12/9/83
- 1.
Request for relief from the 100% surface examination required fo_r the Surry Unit 1 nonregenerative heat exchanger integrally welded supports:
RESPONSE
Upon further evaluation, it has been decided to withdraw this request.
- 2.
Request for relief from post-repair hydrostatic test requirements following installation of valve 2-MS-76 in Surry Unit 2:
- a.
Provide additional details and data with regard to the extent of system leakage and the inability of your pumps to cope with this leakage and achieve the required hydrostatic test pressure.
Provide pump curves if they may aid you in your explanation.
RESPONSE
An auxiliary feed pump (motor driven) was utilized to provide pressure for the hydrostatic test.
This pump was successfully utilized in our steam generator hydrostatic tests providing the required 1356 psig test pressure.
The pump was placed in a recirculation mode with the test boundary pressurized using a hose connection (l ") from a drain on the discharge side of the pump.
Pressure was increased by limiting discharge flow in the main recirculation flow path.
As stated in the relief request, a
maximum pressure of 1210 psig was reached.
This corresponds to an available flow rate of approximately 330 gpm in the recirculation flow path (Pump curve is attached).
Actual flow rate through the one-inch hose connection was not measured, however the discharge flow of the pump was limited to near shut-off conditions, directing the flow through the hose connection for the test.
The large leak within the test boundary was entirely internal as no external leakage was located within the test boundary.
The test boundary was limited to single valve closure as evidenced by the drawing.
(FM-11548-64A).
Normal hydrostatic test pumps have limited flow rates at high pressures and are unable to maintain pressure with significant leakage.
The auxiliary feed pump provided high pressure at a high flow rate and provided the best pressure source available at the station.
The boundary valves utilized in the test are exposed to an environment which can cause deterioration of the valve internals through several mechanisms; steam
- cuts, corrosion etc, As no back-up isolation valves exist, complete pressurization of
'A' steam generator would be necessary to test the replaced valve at the required pressure.
2
- b.
What is the design temperature for the piping in question?
RESPONSE
The design temperature is 560°F.
- c.
What is the lowest pressure setting among the safety or relief valves provided for overpressure protection within the boundary of the piping that was required to be included in the test?
RESPONSE
Design pressure is 1085 psig (no permanent relief or safety valve within test boundary).
- d.
Provide a
legible copy of your drawing 11548-FM-64A.
provided with your original request was illegible.
RESPONSE
Print 11548-FM-64A is enclosed.
The copy
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