ML18136A159
| ML18136A159 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 07/11/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7911070567 | |
| Download: ML18136A159 (4) | |
Text
e Distribution
~ocket Files 50-280 TERA and 50-281 ACRS (16Y ocket Nos.
and Mr. W. L. Proffitt Senior Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Ri-chmond, Virginia 23261
Dear Mr. Proffitt:
NRC PDR(2)
. Loca 1 PDR ORB Reading NRR Reading W. Gammill D. Eisenhut B. Grimes T. J. Carter W. Russell Attorney, OELD M OI&E (3)
A. Schwencer D. Neighbors P. Kreutzer J. Buchanan
-We*have reviewecl...your letter dated September 26, 1977, which provided information concerning degraded grid voltage in response to NRC request dated June 3~ 1977.
We have determined* that the additional inrnormation in the enclosure is necessary in order to continue our review.
To enable us to maintain a review schedule con~istent with ouroobjec-tive of resolving this issue by the end of 1979, please submit the requested information and Technical Specification* changes within 45 days of receipt.
t,Je appreciate your cooperati_on on this issue.
Enclosure:
As Stated cc: w/enclosure See next page Sincerely, A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
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L Docket Nos. 50-280 and 50-281 Mr. W. L. Proffitt e
e UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 July 11, 1979 Senior Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261
Dear Mr. Proffitt:
We have reviewed your 1.etter dated September 26, 1977, which provided information concern.ing degraded grid voltage in response to NRC request dated June 3, 1977.
We have determined that the additional information*
in the enclosure is necessary in order to continue our review.
To enable us to maintain a review schedule consistent with our*:objec-tive of resolving this issue by the end of 1979, please submit the requested information and Technical Specification changes within 45 days of.receipt.
We appreciate your cooperation on this issue.
Enclosure:
As Stated cc: w/enclosure s~e n~rt r**sC!~
a~c~~
A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
- e.
Mr. W. Virginia Electric and Power Company cc:
Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535 Richmond, Virginia 23213 Swem Library College of William and Mary WilliamsQurg. Virginia 23185 Donald J. Burke U.S. Nuclear Regulatory Commission Region Il Office of Inspection and Enforcement 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
/
e July 11, 1979
L e
REQUEST FOR ADDITIONAL INFORMATION SURRY UNITS l AND 2 DEGRADED GRID VOLTAGE E'LOSURE..
- 1.
Degraded voltage protection is not provided between 80-90% of nominal voltage. Sustained voltage, even.for a short period qf time9 within this range may cause damage to electrical equipment.
Present an analysis that supports your design of not having protection within this range; or provide appropriate protection between 80-90% of nominal voltage.
- 2.
Describe the s~quence of events, fsuch as lo~d shedding, bus de-energization, load sequencing, etc.) *;f, while on onsite power, the onsite power source is interrupted. Describe the reinstatement or basis for no reinstatement of load shedding,._
- 3.
Describe how the IEEE Std. 279-1971 requirements are satisfied in the design of the voltage monitors of second-level protection.
- 4.
Submit a proposed change to the Surry Units l and 2 Technical Specifications including test schedule for channel check, calibration, and functional testing..