ML17192A540
| ML17192A540 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Sequoyah, Quad Cities  |
| Issue date: | 02/29/1980 |
| From: | Janacek R COMMONWEALTH EDISON CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17192A541 | List: |
| References | |
| NUDOCS 8003050550 | |
| Download: ML17192A540 (7) | |
Text
e Commonwealth Edlsorl
- bne. First National Plaza. Chidgo, Illinois AdciressFie-PiY. io:-**Pasi--011ke sox 767 Chicago, Illinois 60690-_
February 29, 1980 Mr. Thomas A. IPtx>lito, Chief Operating Reactors - Branch 3 Division of Operating Heactors u.s. Nuclear Regulatory Corranission -
Washington, DC 20555
Subject:
Dresden Station Units 2 and 3 Quad Cities Station Units 1 and 2 Response to Request for Information concerning Fire Protection Safe Shutdown Analysis NRC'Docket Nos~ 50~237/249/254/265 References (a):
T._ A. Ippolito letter-to D. L. Peoples dated October 22, 1979 (b):
R. F. Janecek letter. to T. !\\.Ippolito dated January 23, 1980
Dear Mr. Ippolito:
Reference (b) provided a partial response to a request for information in-Reference (a) concerning our Fire Protection Safe Shutdown analysis at Dresden
- 2/3 and Quad Cities. to this letter contains our resp:mse to Item 8 (1) of Reference.(a) for Quad Cities.* The control cirduit design required to respond to Items 8(c) and B(e) are not complete at this time.
Our response to these items will be provided by June l,* 1980-. contains our response t6 Items 8 (e) and 8 (l) of.
Reference (a) for Dresden 2/3. Three COT)ies of the indicated drawings are provided for your use.
Please-address any a&Htional questions you may have concerning this matter to this office.
One (1) signed original and fifty-nine (59) copies of this transmittal are provided for your use~
Attachment V~ry truly yours, Robert P. Janecek Nuclear Licensing Administrator Boiling Water Reactors
,J -
Quad Cities 1/2 Question 8(1)
Demonstrate that repair procedures for cold shutdown.systems are de-veloped and material for repairs is maintained on site.
Response.
The Quad Cities Safe Shutdown Analysis for fire describes the means for taking the plant from hot shutdown to cold shutdown.
The analysis does not rely on repairs or addition of materials; therefore, repair procedures are.not necessary.
Question 8( e)
Dresden 2/3 Demonstrate that alternate shutdown power sources, including all breakers, have isolation devices on control circuits that are routed through the area to be avoided, even if the breaker is to be operated manually.
Response
The equipment that would be needed to provide for a safe shutdown for fire is identified in the Dresden 2/3 Safe Shutdown Analysis and its supplements.
This equipment is:
- 1.
Control Rod Drive Pumps
- 2.
~ondensate Transfer Pumps*
The power supplies necessary to provide power to these pumps are:
- 1.
4KV bus supply from Diesel Generators.
- 2.
4KV bus supply from opposite unit.
- 3.
4KV bus supply to Control Rod Drive Pumps.
- 4.
4KV bus supply to the 480 Volt bus supply to the MCC feeding the
- Condensate Transfer Pumps.
- 5.
480 Volt supply to the Condensate Transfer Pumps.
Copies of the following drawings provide the details of the isolation devices of control circuits for the ~ower sources identified above.
Unit 2 Service Bus Circuit Breaker Draw,i ng Bus 23-1 Feed -
DG 2/3 23-1 2333 l 2E2345 Rev.
Bus 24-1 Feed -
DG 2 24-l; 2422 12E2346 Rev.
Bus 23-1 BT to Bus 23 23-1 2329 12E2344 Rev.
Bus 24-1 BT to Bus 24 24-1 2430 12E2344 Rev.
Bus 23 BT to Bus 23-1 23 2302 12E2344 Rev.
Bus 24 BT to Bus 24-1 24 2411 12E2344 Rev.
Bus 24-1 BT to Bus 34-1 24-1 2432 12E2346 Rev.
Bus 23 Feed to CRD Pump 2A 23 2301 l 2E2416 Rev.
Bus 24 Feed to CRD.Pump 2B 24 2414 12E2416 Rev.
Bus 23-1 Feed to. Transformer 28 23-1 2327 12E2349 Rev.
Bus 24-1 Feed to Transformer 29 24-1 2426 12E2349 Rev.
Transformer 28 Feed to 480 Volt Bus 28 28
- MF28 l 2E2349 Rev.
Transformer 29 Feed to 480 Volt Bus 29 29 MF29 12E2349 Rev.
Bus 28 Feed to Bus 28-2 28 12E2374 Rev.
Bus 29 Feed to Bus 29-2 29*
l 2E2374 Rev.
Bus 28-2 Feed to Cond. Trans. Pump 2A 2B-2 l 2E2370 Rev.
Bus 29-2 Feed to Cond. Trans. Pump 2B 29-2 l 2E2370 Rev.
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F.nclosure 2 Dresden 2/3 Question 8(1)
Demonstrate that repair procedures for cold shutdown systems are de-veloped and material for repairs is maintained on site.
Response
A review rif the Dresden 2/3 Safe Shutdown Analysis and Supplement 1 to that analysis indicates that no credit is taken for system repairs to enable the plant to be taken to cold shutdown.
Therefore, no repair procedures or materials for repair are necessary.
.e
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