ML18139C259
| ML18139C259 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 03/07/1983 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| References | |
| 113, NUDOCS 8303110323 | |
| Download: ML18139C259 (2) | |
Text
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e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 W. L. STEWART VICE PRESIDENT NUCLEAR OPERATIONS March 7, 1983 Mr. Harold R. Denton Office of Nuclear Reactor Regulation Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen:
RELIEF REQUESTS FROM ASME XI FOR Serial No. 113 NO/WDC:acm Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 SURRY POWER STATION UNITS 1 AND 2 10 YEAR INSERVICE INSPECTION The draft SER on the inservice inspection relief requests for Surry Power Station Units 1 and 2 (submittals dated December 15, 1980 - Serial Nos. 944 and 945) has been reviewed.
As a
- result, the following supplemental information is provided.
A review of the hydrostatic testing requirements for class 3 systems in the 74S75 code as well as the 77W78 code reveals no significant difference in testing impact for Surry Power Station.
We maintain that hydrostatic tests are impractical in portions of systems such as component cooling, spent fuel pit cooling, service water, and boric acid transfer.
As additional basis, a hydrostatic test of the boric acid transfer system (which normally contains 13w/o boric acid at 160F) could result in a dilution of boric acid in the operating unit should a test boundary valve leak.
The component cooling and spent fuel pit cooling systems operate with monitored and controlled water chemistry.
Hydrostatic testing of component cooling system involves large boundaries with difficult isolation.
The service water systems operate at very low pressures ranging from 20 feet of water to 45 psig.
It is doubtful that a higher level of quality is assured by a 22 feet of water or 49.5 psig hydro respectively.
We propose that a system inservice test as described in IWD 5221 77W78 be allowed for these cases.
A qualified VT-2 examiner will perform the examination.
Finally, should any repairs be required to these systems a hydrostatic test of the repaired area will be performed as required by article IWA 4000.
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e VIRGINIA ELECTRIC AND POWER Cm,!PANY TO Harold R. Denton Also, a hydrostatic test of the Class 1 piping downstream of the accumulator discharge MOV is not possible.
The required test pressure is 2459 psig.
This is higher than pressurizer PORV open setpoint and only 26.5 psig margin to code safety setpoint.
An inservice test with VT-2 examination has been conducted on this piping at 660 psi which is 1.10 higher than the Tech. Spec.
minimum accumulator pressue and 40 psig less than accumulator RV setpoint.
cc:
Mr. James P. O'Reilly Regional Administrator Region II Very truly yours,
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W. L. Stewart