ML18139C251
| ML18139C251 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 03/02/1983 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| References | |
| 085A, 85A, NUDOCS 8303070048 | |
| Download: ML18139C251 (2) | |
Text
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VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261
- w. L. STEWART VrcE PRESIDENT NUCLEAR OPERATIONS March 2, 1983 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:
TECHNICAL EVALUATION REPORTS Serial No. 085A NO/ERS,Jr.:acm Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 ENVIRONMENTAL QUALIFICATION OF SAFETY RELATED ELECTRICAL EQUIPMENT SURRY POWER STATION UNITS 1 AND 2 Your letter of January 26, 1983 requested additional equipment qualification.
In response to that justification for continued operation in our letter This letter supplements our previous letter with concerning reactor coolant system wide range pressure.
information concerning
- letter, we supplied of February 23, 1983.
additional information This parameter serves as an input to the subcooling meter.
This device was installed in response to NUREG-0737 and provides information related to the margin of subcooling in the reactor coolant system.
This device does not perform automatic actuations of safety equipment.
Before this device was installed, operations personnel used pressure and temperature of the reactor coolant system to ascertain the thermodynamic condition of the reactor coolant.
Currently installed instrumentation outside the containment with remote indication in the control room and with a range of O to 3000 psig could be used to infer the reactor coolant system margin to saturation.
One pressure transmitter is located near the boron injection tank and the other is located on the charging/high head safety injection pump discharge header.
Within the capacity/head curve for this pump, these pressure indications less friction losses in the piping represent the reactor coolant system pressure.
With the pumps at runout flow, the coolant system integrity has degraded to a point where margin to subcooling cannot be maintained by the charging pumps.
Other safety systems including accumulators and low head safety injection pumps are operating to cool the reactor core and repressurizing the reactor coolant system is not likely to occur.
I e
V1RGlNJA ELECTRIC AND POWER COMPANY TO Harold R. Denton For Surry Unit 1, qualified equipment is being installed during the.current outage.
For Surry Unit 2, qualified equipment will be installed during the outage planned to begin on May 1, 1983.
The probability of an event occurring prior to having a fully qualified indication of wide range pressure available is very low for Surry Unit 2.
Alternate means of assessing reactor coolant system pressure exist.
Continued operation of Surry Unit 2 is justified. :
Unit 1 Response :
Unit 2 Response cc:
Mr. James P. O'Reilly Regional Administrator Region II Very truly yours, Qcs~
W. L. Stewart