ML18139C081
| ML18139C081 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 10/25/1982 |
| From: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-B-24, REF-GTECI-EL, REF-GTECI-ES, TASK-2.E.4.2, TASK-B-24, TASK-OR, TASK-TM 606, NUDOCS 8210280266 | |
| Download: ML18139C081 (2) | |
Text
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e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND., VIRGINIA 23261 R.H.LEASBURO V1cE PRESIDENT Nucr.EAB OPERATIONS October 25, 1982 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:
CONTAINMENT PURGING/
CONTAINMENT VACUUM AIR EJECTOR ISOLATION VALVES PROPOSAL SURRY UNITS 1 AND 2 Serial No. 606 NO/TMN/jmj/SP4 Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 During the containment purge valve operability qualification for Surry Power Station Unit Nos. 1 and 2, it was brought to our attention in your letter of October 3, 1981, "Status of Generic Item B-24 and completion of TMI Action Item II.E.4.2.5", that the eight-inch steam jet air ejector isolation valves in the Containment Vacuum System were to be included in our qualification program.
In our letter of December 31, 1981, Serial No. 709, it was requested that Surry Power Station Technical Specification 3, 8. A. 3 be revised to restrict the containment purge valve operation whenever the reactor coolant temperature is,above 200°F.
The specific requirement was intended as an interim change pending conclusion of the containment purge valve qualification program for the 36" containment purge valves.
This effort has been completed. Although we have proven that the valves will operate through a range of dynamic forces of a design basis accident, it is not beneficial to implement the additional modifications to the mechanical and electrical systems in order to meet the guidelines set forth by the Standard Review Plan, section 6.2.4, Revision 1 and the Branch Technical Position CSB 6-4, Revision 1.
For the existing 8 11 steam jet ejector valve in the Containment Vacuum System, a high radiation signal will be wired to activate valve closure in the event of a high radiation signal during system operation.
This valve is seismically qualified and has a closure time of less than five seconds.
To ensure the prevention of a radioactive release, a new automatic isolation valve will be installed on the 8 11 line outside of the containment building.
The new valve will have a closure time not greater than 5 seconds and will be qualified to seismic requirements.
A control system will be provided for automatic isolation and remote manual operation.
8210280266 821025 PDR ADOCK 05000280 p
p VIRGINIA ELECTRIC AND POWER COMPANY TO The Containment Vacuum Air Ejector System in the proposed modified state will only be operated when the Reactor Coolant System is below a temperature of 350°F and a pressure of 450 psig.
This is consistent with Engineered Safe-guards Systems operability requirements.
There are no environmental qualification operability requirements related to harsh environment for the existing automatic isolation valve or the proposed new valve.
This is because the containment vacuum system is not involved in safe shutdown of the facility in the event of an accident.
cc:
Mr. James P. O'Reilly, Regional Administrator Region II Atlanta, Georgia 30303 Mr. Richard C. DeYoung, Director Office of Inspection and Enforcement Washington, D.C.
20555 Very truly yours,