ML18139B876
| ML18139B876 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 05/10/1982 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8205240014 | |
| Download: ML18139B876 (4) | |
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Docket Mos. 50-280 50-281 Mr. R. M. Leasburg Vice President - Nuclear Operations Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261
Dear Mr. Leasburg:
I DT STRIBUTI ON ket Fi 1 e PD.R Local PDR ORB Rdg D~ Eisenhut OELD OI&E (1)
D. Neighbors C. Parris NSIC ACRS (10)
We are reviewing your submittal dated March 31, 1982 related to adequacy of station el ec.tric d~;stribution system voltages and degrrcfded grid protection for the Surry PowetS Station, unit Nos. 1 and 2.
We find that we need additional information so that we may continue our review.
Please respond to the enclosed questions within 30 days of receipt of this letter.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, 0MB clearance is not re-quired under P.L.96-511.
Enclosure:
As Stated cc; w/enc1osure See next page Sincerely, C'l,*1,+,2i\\ sif;l'Hld by
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Ste\\11m l\\. \\f arga Steven A. Varga, Chief Operating Reactors Branch #1 Division of Licensing
( 82052.fJC,014 820510 - - -- -
, PDR ADOCK 05000280
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NRCFORM318(10-80)NRCM0240 OFFICIAL RECORD COPY USGPO: 1981-335-960
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Mr. R.H. Leasburg Virginia Electric and Power Company, cc:
Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535 Richmond, Virginia 23213 Mr. J. L. Wilson, Manager P. O. Box 315 Surry, Virginia 23883 Swem Library College of William and Mary Williamsburg, Virginia 23185 Donald J. Burke, Resident Inspector Surry Power Station U.S. Nuclear Regulatory Commission Post Office Box 166 Route l Surry, Virginia 23883 Mr. J. H. Ferguson Executive Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261 James P. O'Reilly Regional Administrator - Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
REQUEST FOR ADDITIONAL INFORMATION SURRY UNITS l AND 2 ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES AND DEGRADED GRID PROTECTION REF. l:
VEPCO letter (R.H. Leasburg) to NRC (S. A. Varga), dated March 31, 1982 The following additional information and/or clarification is requested for continuing the technical evaluation on the voltage analyses, proposed design modifications and operating restrictions submitted in the above reference.
- 1. Your analysis indicates that starting of condensate, high pressure heater drain, bearing cooling, component cooling water reactor coolant or steam generator feedwater pumps during a safety injection (SI) or consequence limiting situation (CLS) could cause spurious actuation of the second level undervoltage relays for the worst case analyzed.
You state that modifications will be made to prevent automatic starting of the condensate, high pressure heater drain, bearing cooling water and component cooling water pumps during a SI or CLS.
Provide design details on this modification.
Additionally confirm that plant operating procedures will be in place to prevent manual starting the above motors during an SI or CLS.
- 2. Transformer overload sensors are placed on the 500/230/36.5 kV auto-transformers and the 230/36.5 transformer to actuate an alarm for possible overload conditions.. What are the settings for these sensors and what actions are taken upon-receiving an alarm?
- 3. Submit a schedule for completing and submitti_ng the following:
(a)
MCC control transformer upgrading results and worst case overvoltage and undervoltage analyses (steady state and transient) at the 120 volt contactor level.
(b)
Results of the possible upgrading of overload heaters.
(c) MOV rerat ing and/or replacement.
- 4.
In the computer model verification, clarify the relationship between the two columns entitled "Measured" and "Voltmeter Reading." Also,
- submit details of the test method used, plant operating mode, bus loading conditions (load percentages), distribution voltage, etc.,
and verification that the percentage errors presented in Appendix M are applicable to both steady state and transient analysis conditions~
- 5. Submit drdft proposed Technical Specifications changes to address limiting conditions for operation, testing; calibration, and surveillance requirements for the proposed undervoltage protection schemes. Also, a test is required to be included in the Technical Specifications to demonstrate the operability of the automatic bypassing and auto-reinstatement of the undervoltage relays when the diesel generators are supplying the Class lE buses _(see NRC letter dated June 3, 1977).
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- 6. Are the following viable source connections?
(a) A single 500/230/36.5 kV autotransformer supplying both 34.5 kV buses 5 and 6 [i.e., breaker LT22 open and LT12 closed (or vice versa), T562 closed and both L402-5 and L402-6 open].
{b)
The 230/36.5 kV transformer supplying both 34.5 kV buses 5 and 6 [i.e., breakers LT12 and LT22 open, T562 closed and L402-5 closed and L402-6 open (or vice versa)].
If these are not viable connections, are there interlocks to prevent these breaker alignments?
- 7. Are there interlocks to prevent closure of both the 34.SkVlow side breakers on the 230/36.5 kV transformer?
- 8. Appendixes I, J and K of Attachment 1 to Reference 1 show simultaneous starting of the containment spray, chargin~, and low head safety injection pumps at T=O.
The discussion on these events in section V.H indicate that during a transient voltage condition the above motors will start sequentially. Clarify the above contradictory information~
- 9. *In section B you state that the feeder cables from the Reserve Station Service transformers (RSST's) to the inplant distribution system busses will be replc!ced.
Confirm with detailed drawings *and description that this modification will comply with GDC-17 requirements regarding physical separation and independence.
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