ML20002A745
| ML20002A745 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 11/14/1980 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20002A746 | List: |
| References | |
| NUDOCS 8011210465 | |
| Download: ML20002A745 (4) | |
Text
i SOUTH CAROUNA ELECTRIC & GAS COMPANY POST OF FICE SON F64 CotuMe:A, SOUTH CARoWNA 292t8 L C. PhcHots,Jn.
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November 14, 1980 n-u. e n..,a,,,
Mr. liarold R. Denton, Director Office of Muclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Subj ect : Virgil C. Summer Nuclear Station, Unit #1 Emergency Operating Procedures Docket No. 50-395
Dear Mr. Denton:
Enclosed are the following V.C. Summer Nuclear Station Emergency Operating Procedures:
E0P-1, " Safety Injection Actuation"; EOP-5, " Reactor Trip"; E0P-13,
" Natural Circulation"; and E0P-14, " Inadequate Core Cooliag".
These procedures incorporate comments generated by the Nuclear Regulatory Commission and their Consultant, Pacific Northwest Laboratories, and have been demonstrated to be functional on the Westinghouse Simulator at Zion, Illinois.
Two (2) remaining areas of concern expressed by the NRC representative are:
a) Justification for de-energizing Balance of Plant 460V buses XSW1B1 and XSWICI in response to ATUS situations.
b)
Relationship of the Shift Technical Advisor in implementing procc-dures.
Enclosure I shows the electrical loads on 480V buses XSW1B1 and ICl. As shown, none of the loads are required for the safe shutdown of the unit.
- Further, due to the distribution of Balance of Plant electrical leads, no secondary plant systems will be made completely inoperable except for the Rod Drive MG Sets which will trip the Reactor and the Main Turbine El!C Fluid Pumps which will trip the Main Turbine. The Reactor Trip and Turbine Trip are the points of de-energi-zing buses XSUlB1 and XSWIC1. Please note that these buses are completely inde-pendent of the ESF Electrical Distribution System. Also, during plant startup operations, buses have been tripped with no effect shown on the remainder of the BOP Distribution System. Therefore, South Carolina Electric and Gas Company feels that this action for an ATWS situation is the fastest, easiest method of initiating a Reactor / Turbine Trip when automatic or manual trips do not function properly.
It does not rely on communicating with an outside operator and does not rely on that outside operator going f rom wherever he may be to the appropri-ate panel to open a breaker.
The Shift Technical Advisor (STA) will be an integral non-operating part of each shift.
lie has received the training to analyze unusual plant situations, and since he has no operating duties, can monitor plant conditions for indica-tions that the operators either over'aok or may be outside the scope of the pro-cedures they may be using. llis main function is to perform this monitoring, 8013 e 10 %5 g
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V.C. Summer Nuclear Station Emergency Operating Procedures Mr. Harold R. Denton - NRC November 14, 1980 analyze the conditions, and advise the Shift Supervisor of developing problems.
He can further recommend corrective actions to mitigate the problem. However, it would be inappropriate to insert specific signoff points in the procedures for the STA for three main reasons. First, it would imply that his signoff would be required before proceeding further, in effect, giving the STA command authority that he does not have.
Secondly, it u uld imply that the only place he would have any say in implementing the procedure or of fering advice would be at that specific point and this is also not true.
Finally, it would single out the STA for a unique case, which he may be; however, a case could then be made that each member of the team is unique with specific duties and therefore should have signoff points.
It is much cleaner to treat the signoffs as being directed to the " primary user" while other persons report conditions and actions to him.
In reference to the E0P-14, " Inadequate Core Cooling", South Carolina Electric and Gas Company is pursuing with Westinghouse Owners Group the basis for their 1200"F minimum limit on the Incore Thermocouples as a symptom of inadequate core cooling.
Very truly yours,
(( ')htkg
/L
/
T.C. Nichols, Jr.
//
ENCLOSURES KWW/ ARK /bsg cc: Messrs. B.A. Bursey V.C. Summer C.H. Fischer W.A. Williams T.C. Nichols E.H. Crews D.A. Nauman 0.S. Bradham O.W. Dixon J.B. Knotts R.B. Clary J.L. Skolds A.R. Koon KPCP/Whitaker file (2)_
s Enclosure I XSWlB1 and XSWIC1 Electrical Loads XSWIB1 1.
Turbine Closed Cycle Cooling Pump B.
Pump A is still available from XSWlA1.
2.
Alternate Feed to Substation. Normal feed is from XSWlA1.
3.
}hin Condenser Vacuum Pump B.
Pump C will be de-energized on IC1, but Pump A is still available. Turbine is tripr7d and decreasing vacuum is not a major concern at this time.
4.
Cencrator Stator Cooling Water Pump B.
Pump A is energized from XSWlA1.
5.
Rod Drive MG Set B. - Desired to be de-energized.
6.
EHC Fluid Pump B. - Desired to be de-energized.
7.
Auxiliary Condenser Vacuum Pump B.
Pump A will be de-energized on XSW1C1, however, auxiliary condensers are open to the main condensers.
8.
Main Transformer Coolers. With turbine trip heat load on, main transformer will be greatly reduced so the cooling fans are not essantial.
9.
Open Cycle CW Booster Pump B.
Fain cooling loads have been removed on plant shutdown.
10.
Feed to XMC-1BlX. This motor control center has an ATU (Automatic Transfer Unit) which will receive power from an alternate source without loss of function.
XSWICI 1.
QA Office Building. - Not required far a plant operation, j
2.
Exhaust Hood Spray Pump B. - Not required during shutdown, Pump A is avail-able from 1A1.
3.
Rod Drive F0 Set A. - Desired to be de-energized.
4 EHC Fluid Pump A. - Desired to be de-energized.
5.
Main Condenser Cleaning Pit Sump Pump. - Not required for shutdown.
6.
Motor Control Center XMCIClX. This motor control center has an ATU (Automatic Transfer Unit) which will receive power from an alternate source without loss of function.
7.
Main Condenser Vacuum Pump C - Normally not running.
Vacuum Pump A still available from XSWlAl.
(1 of 2)
w Enclosure I.
XSWICI (contd.)
8.
Turbine Closed. Cycle Cooling Pump A. - Pump B is still available.
9.
Auxiliary Condenser Vacuum Pump A. - Pump B is also de-energized on vsWlB1, however, auxiliary condensers are open to the main condenser to help maintain' vacuum during feed pump coastdown.
j 10.
Open Cycle CW Booster Pump A.
Main cooling loads have been removed j
on plant shutdown. System is equipped with a bypass around the pumps i
to maintain cooling water flow from the circulating water system.
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(2 of 2)
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