ML20132C399
| ML20132C399 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, McGuire  |
| Issue date: | 09/23/1985 |
| From: | Gill R DUKE POWER CO. |
| To: | Hood D Office of Nuclear Reactor Regulation |
| References | |
| TAC-56474, TAC-56475, TAC-57340, NUDOCS 8509270035 | |
| Download: ML20132C399 (6) | |
Text
{{#Wiki_filter:$0 *3(a9 Dunn Powen Go>n>m NUGI.EAll I'HODUGTION del %IIT31ENT l'.O. ISOX 3 31150, 4 22 MOUTIt CItt:HCII MTitt:Irr CIIAllLOTTi!, N.C. 215242 (704) a7a-401: September 23, 1985 Darl Hood, NRC Project Manager Division of Licensing Office of Nuclear Regulatory Commission Washington, D. C. 20555
Subject:
McGuire Nuclear Station Response to Questions Concerning Fire Suppression Pump 'C' In response to your questions of September 10, 1985, the following information is provided:
- 1. Can any fire suppression pump be loaded on the IE diesel?
The repowering of an existing Fire Suppression Pump from a Class 1E Diesel is undesirable due to current loading on the lE Diesels, such an arrangement would cause the power to be unavailable during LOCA situations.
- 2. For fire suppression pump 'C', is the substation part of the grid or can it be separated from it?
Fire Suppression Pump C receives power froa a 44KV substation fed from Riverbend Steam Plant Switchyard. There is no direct connection between the McGuire Switchyard and the 44KV System at Riverbend. The McGuire 52SKV Switchyard has no direct tie to Riverbend, while the 230KV Switchyard is connected to Riverbend via the Schoonover and Norman Lines (see attached). At Riverbend, Units 6 and 7 feed the 230KV Switchyard through step-up transformers 6B and 7B. The 44KC Switchyard is fed from the 100KV Switchyard through a tertiary winding on the step-up transformer for Units 1, 2, and 3 or through
, tie lines such as Mountain Island.
ge Under normal plant conditions, there is no tie between the 230KV k@ Switchyard and the 44KV Switchyard at Riverbend. Units 6 and 7 have 87 the capability to be aligned to the 100KV yard through alternate step- 'O up transformers 6A and 7A; however, if this alignment is used, breakers g oc to the 230KV Switchyard are opened and still no direct connection exists between the 230KV Switchyard and the 44KV Ewitchyard, i oo 54 This isolation allows a total blackout of the McGuire Switchyard for I g om any reason-fault, natural disaster, equipment failure, etc. to occur Q@g with no consequences to the 44KV feeder to Fire Suppression Pump C. Therefore, for any localized blackout situation at McGuire which would cause the loss of Fire Suppression Pumps A and B, Fire Suppressior Pump C would still be available for service. I \
_. _ - . . _ _ _ _ .._ - _ . _ _ _ _ _ _ . _ _ _ = . - - _ _ _ _ _ _ _ _ _ . _ . . _ _ . _ i . Darl Hood, Project Manager ' September 23, 1985 p Page 2 1 Stability studies - are there quantitative type studies that have been performed that could be used to support the " independence" of f the substation? To our knowledge, no quantitative type studies have been performed that could be used to support the independence of the substation. However, a record of power interruptions to Fire Suppression Pump C from May, 1975 to November, 1982 (see Attachment 1) shows the 44KV . line to be reliabic. fu e questions regarding this area of concern, please call.
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, . .I Attachment 1 f
Record of Power Interruption to McGuire C Main Fire Pump Motor e se e DATk DIRATOPM CAUSE
- 1. Hay 14., 1975 1 min no indication
- 2. June 12, 1975 88 min lighting 3 . November 22, 1977 -
19 min no indication
- 4. October 2, 1979 less than 1 min lighting .
- 5. November 4, 1982 137 min line insulator' failure 9
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