ML13330A223
| ML13330A223 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/19/1981 |
| From: | Baskin K Southern California Edison Co |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML13330A224 | List:
|
| References | |
| NUDOCS 8102270736 | |
| Download: ML13330A223 (4) | |
Text
Southern California Edison Company P. 0. BOX Boo 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 K. P. BASKIN
- Feray10, 1981 TELEPHONE MANAGER OF NUCLEAR ENGINEERING.
Fe ruary
,13) 51792 14 SAFETY. AND LICENSING Director of Nuclear Reactor Regulation Attention: D. M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
Subject:
Docket No. 50-206 Systematic Evaluation Program Safe Shutdown Systems San Onofre Nuclear Generating Station Unit 1 On November 20, 1980, we were requested by Mr. S. Nowicki of the NRC and Mr. D. Webber of EG&G to provide certain drawings and information for use in evaluating San Onofre Unit 1 with respect to Safe Shutdown Systems. of this letter is a list of drawings, five (5) copies of which are also enclosed. This set of drawings partially fulfills the request.
The remainder of the requested drawings will be furnished by approximately March 15, 1981. of this letter provides responses to the questions asked by Mr. Webber.
If you have any questions, please let me know.
Very truly yours, Enclosures 8102270 7;5
-2
- 2.
Item:
Are there any interlocks that tie one control circuit to another or two systems together for the following systems:
- a. Condensate/feedwater/auxiliary feedwater?
Response
PS79 provides a "close" signal to all four (4) condensate pumps through the "63" relay.
CV-71.and CV-72 are interlocked with all the condensate pump breaker contacts.
SR contact directly interfaces with annunciator.
- b. Pump G-28 and G-28S
Response
No interlocks
- c. Pumps G-11 and G-11S
Response
No interlocks
- d. Pump G-13A, B, C, G-43, G-43S, G4A and B
Response
PS68 and PS62 contacts go to the annunciator
- e. Pumps G-50A & B, G-3A & B, G-27N & S and G-45A & B
Response
No interlocks
- f. Pumps G8A & B
Response
No interlocks except for temporary SFA modifications to pump control scheme.
- g. Pumps G-15A, B & C
Response
PC-605X is common to all three pumps.
The control switch contact from the other two pumps in series with the other train under-voltage (27x) is interlocked with the control circuit.
List of Drawings for Safe Shutdown Systems Drawing Number Title N-1542 Sh. 57 Rev. 1 Elementary Diagram, Reactor Auxiliaries N-1542 Sh. 54 Rev. 1 Elementary Diagram, Reactor Auxiliaries 714431 Rev. 2 SEP Wiring Digram, Misc. Controls & Devices 5150334 Rev.-3 Elementary Diagram,'Pumps 6-28, G-38S, G-26, G-39 5149182 Rev. 7 Load Sequence Schedule, Load Train 2 5149890 Rev. 5 Elementary Diagram, Various Sphere Isolation Valves 5150353 Rev. 1 Elementary Diagram, Trash System and Aux.
Air Compressor 5149927 Rev. 1 Elementary Diagram, Screen Wash Pump G-43 &
G-43S 5149924 Rev. 1 Elementary Diagram, Instrument Air Compressors K1A, KlB & KlC 5149919 Rev. 3 Elementary Diagram, Salt Water Cooling Pumps G-13A & B 5150627 Rev. 3 Elementary Diagram, Screen Wash System Controls 5150345 Rev. 2 Elementary Diagram, Cir. Water Pumps 64351 Rev. 3 Elementary Diagram, CV Mtr. Feed CV-515 &
CV-737A 64353 Rev. 3 Elementary Diagram, CV Mtr. Feed CV-516, CV-526, CV-528 & CV-737B 64369 Rev. 3 Elementary Diagram, Valve CV-737B & CV-518 64356 Rev. 4 Elementary Diagram, Sphere Spray Valve Control CV-82 & CV-114 64363 Rev. 4 Elementary Diagram, Valve CV-517 64350 Rev. 3 Elementary Diagram, CV Mtr. Feed, CV-517, CV-525 & CV-527 64362 Rev. 5 Elementary Diagram, Valves CV-525 & CV-527 64371 Rev. 4 Elementary Diagram, Valves CV-515, CV-526 &
CV-528 455461 Rev. 2 Elementary Diagram, Seal Water Return PCV-1115A, B & C 455451 Rev. 2 Elementary Diagram, Solenoid Valves 449408 Rev. 6 Elementary Diagram, Sol. Valves FCV-456, 457
& 458, Feedwater Control & By-Pass 455462 Rev. 2 Elementary Diagram, Boric Acid Blend Sys.
FCV-1102A & B 455450 Rev. 2 Elementary Diagram, Demin. Bypass Sol. Valve TCV-1105 455452 Rev. 2 Elementary Diagram, Letdown Isolation Sol.
Valve LCV-1112 445116 Rev. 4 Elementary Diagram, Main Steam Dump to Cond.
& Atmos.
Response to Questions
- 1.
Item:
Provide the following information about the safe shutdown panel.
- a. Location?
- b. What devices are on the panel?
- c. What are the power supplies for these devices?
Response
- a. The safe shutdown panel is located on the +20' level at the south end of the turbine building.
- b. Instrumentation:
Pressurizer level and pressure indicators LT430A and PT434A Steam generator level LI450C, 451C & 452C Primary system cold leg temperature Loop A - TE402B Loop B - TE412B Loop C - TE422B NIS combined source/intermediate range monitor Controls:
Steam dump control to atmosphere-manual control for CV-76 and CV-77 Electric auxiliary feedwater pump control Three feedwater valve controls FCV-456, 457 & 458
- c. All power for instrumentation and control circuits are provided from MCC 2A.