ML13317A624
| ML13317A624 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/29/1981 |
| From: | Baskin K Southern California Edison Co |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8106050388 | |
| Download: ML13317A624 (7) | |
Text
Southern California Edison Company P. 0. BOX 00 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 K. P. BASKIN TELEPHONE MANAGER OF NUCLEAR ENGINEERING, (213) 572-1401 SAFETY, AND LICENSING May 29, 1981 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:
Anchorage and Support of Safety Related Electrical Equipment San Onofre Nuclear Generating Station Unit 1 By letter dated March 25, 1981, we provided the status of our program for the evaluation of the anchorage of safety-related electrical equipment. The results of our analysis of equipment at grade elevation were provided in that letter. The purpose of this letter is to provide the results of the rest of the program.
The results of the analysis of equipment in the control room (items 13 through 25 and 46) are provided in Enclosure 1. The item numbers in this enclosure correspond to the numbers in the March 25 letter. All other items were addressed in the March 25 letter. As a result of the analysis, additional modifications were found to be required for process control racks R1 through R7, R10 and R11, the nuclear instrumentation system, radiation monitoring system, vital bus assembly, and CSAS logic Train A cabinets.
Modifications associated with these seven items are identified in Enclosure 1 and are scheduled for completion prior to startup from the current outage.
Subsequent to the preparation of the list of safety related electrical equipment in our March 25, 1981 letter, we initiated a detailed review of electrical equipment at San Onofre Unit 1 to ensure the completeness of our anchorage evaluation program. As a result of this review, we have identified several additional items which will be evaluated as part of our anchorage program. These items are listed as items 48 through 59 in. The analyses for items 48 through 51 have been completed. As a result of these analyses, modifications have been identified for the pressurizer heater distribution cabinets as shown in Enclosure 1. These modifications will be completed prior to startup from the current outage. The analyses for items 52 through 59 are scheduled for completion by June 1, 1981. An onsite inspection indicates that the anchorage of these items appears adequate and that no modifications will be necessary. However, if the analyses of these items indicate that modifications are necessary, we plan to implement them as soon as practicable.
5 8106 05 0-4
D. M. Crutchfield, Chief May 29, 1981 Our March 25 letter also identified a punch list of non-seismic Category I auxiliary items which required further evaluation to determine if they would damage safety-related electrical equipment. The results of these evaluations are identified in Enclosure 2. Modifications identified in Enclosure 2 are scheduled to be implemented prior to startup from the current outage.
If you have any questions on this matter, please contact me.
Very truly yours, Enclosures
Page 1L of 3 RESULTS OF EVALUATION OF ANCHORAGE OF SAFETY RELATED ELECTRICAL EQUIPMENT SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 1 Was Anchorage Item Equipment Type of Modified Since Jan. 1, No.
Description Location Anchorage 1980; If So, How Reference
- 13.
"Main Control Control Room Welded to existing Yes; Added plug welds Calc. No. S-B-01 pp 1-7 Board Console embeds (C03 and C06)
- 14.
Process Control Control Room Bolted to floor No; However, angle will Calc. No. S-B-01 pp 8-18 Racks R6 & R7 be welded to rack and bolted to floor
- 15.
Process Control Control Room Bolted to floor Yes; Welded angles Calc. No. S-B-01 pp 19-14 Racks R10, R11 to sub-base and R1 through R5 bolted them to floor.
Also, sub-base will be welded to base
- 16.
Process Control Control Room Bolted to floor Yes; Welded angles Calc. No. S-B-01 pp 45-50 Racks R12, R13 to sub-base and
& R14 bolted them to floor
- 17.
Vertical Control Control Room Bolted to floor Yes; Welded angles Calc. No. S-B-01 pp 51-97 Boards (C05, C09 and ceiling to sub-base and C12 & C13) bolted them to floor
- 18.
Nuclear Instrum.
Control Room Bolted to floor Yes; Welded angles Calc. No. S-B-01 pp 98-1@
System (C1O) to sub-base and bolted them to floor.
Also, sub-base will be welded to base
- 19.
Radiation Monitoring Control Room Bolted to floor Yes; Welded angles Calc. No. S-B-01 p. 108 System to sub-base and bolted them to floor.
Also, sub-base will be welded to base
Page 2 of 3 Was Anchorage Item Equipment Type of Modified Since Jan. 1, No.
Description Location Anchorage 1980; If So, How Reference
- 20.
CSAS Inverter Control Room Bolted to floor No Calc. No. S-B-01 pp 109-114 and wall
- 21.
Diesel Generator Control Room Bolted to floor No Calc. No. S-B-01 pp 115-119 Control Boards SPG1 (C41) &
SPG2 (C42)
- 22.
SEP Relay Panels Control Room Bolted to floor No Calc. No. S-B-01 pp 120-128 A & B and wall (C60 & C61)
- 23.
Vital Bus Control Room Bolted to floor Yes; Added concrete Calc. No. S-B-01 pp 129-131C Assembly (C16) fastener. Also, angle will be welded to cabinet and bolted to floor.
- 24.
Safeguard Load Control Room Bolted to floor No Calc. No. S-B-01 pp 132-134 Sequencing System
- 25.
Inverter #4 Control Room Bolted to floor No Calc. No. S-B-01 pp 135-137
- 46.
CSAS Logic Control Room Bolted to floor Yes; Welded angels Calc. No. S-B-01 pp 138-143 Train A and welded to sub-base and (FC62 & GC62) bolted them to floor.
Also, sub-base will be welded to cabinets.
- 48.
Pressurizer Heater 4 kV Room Bolted to floor No; However, will Calc. No. S-B-03 pp 2-18 Distrib. Cabinet add welds and plates.
(B07)
- 49.
Pressurizer Instrum.
Containment Welded to floor No Calc. No. S-B-02 Cabinets (C33)
- 50.
Station Service Outside Bolted to base No Calc. No. SEP-C-C-008-2 Transformer 3
Page 3 of 3 Was Anchorage Item Equipment Type of Modified Since Jan. 1, No.
Description Location Anchorage 1980; If So, How Reference
- 51.
Pressurizer Heater 480 V Room Welded to embedded No Calc. No. S-B-02 Distrib. Cabinet channel (B08)
- 52.
480 V Switchgear 3 480 V Room Bolted to wall No Field inspection D. C. Undervoltage Relay (014)
- 53.
DG1 Fuel Oil Diesel Bolted to wall No Field inspection Standby Pump Generator Motor Starter (D15)
Building
- 54.
DG2 Fuel Oil Diesel Bolted to wall No Field inspection Standby Pump Generator Motor Starter (016)
Building
- 55.
G45A Thermal Outside West Bolted to wall No Field inspection Overload (T45A)
Wall of 4kV Room
- 56.
G45B Thermal 480 V Room Bolted to wall No Field inspection Overload (T45B)
- 57.
G14A Thermal Outside West Bolted to wall No Field inspection Overload (T14A)
Wall of 4 kV Room
- 58.
G14B Thermal Outside East Bolted to wall No Field inspection Overload (T14B)
Wall of 480 V Room
- 59.
Tsunami Gate Outside Bolted to tank No Field inspection Local Control Panel which is welded to base NONSEISMIC CATEGORY I AUXILIARY EQUIPMENT Item Description 4 kV Room
- 1. Fire extinguisher, wheeled type
- 1. Will be bolted to floor
- 2. Nonsafety related cabinets
- 2. Will add welds and plates
- 3. Table
- 3. Will be removed 480 Volt Room
- 1. Fire extinguisher, wheeled type
- 1. Will be bolted to floor
- 2. Nonsafety related cabinets
- 2. Will add welds to existing embedded steel.
- 3. Spare circuit breakers
- 3. Will be removed Turbine Building
- 1. Gas bottles
- 1. Existing anchorage adequate
- 2. Monitoring equipment cabinet
- 2. Will weld to steel column
- 3. Excitation switchgear and power
- 3. Will add welds system stabilizer cabinets Control Room
- 1. Ducting
- 1. Will modify design of supports in problem areas
- 2. Hanging lights
- 2. Existing anchorage adequate
- 3. Bookcases, desks and tables
- 3. Anchorage not required(1 )
- 4. Nonsafety related cabinets
- 4. Will add bolts and welds North Diesel Generator Building
- 1. Work bench
- 1. Will add bolts
- 2. Table
- 2. Will remove
- 3. Eye wash bottle
- 3. Existing anchorage adequate
- 4. Miscellaneous unattached ladders
- 4. Will remove
-2 Item Description South Diesel Generator Building
- 1. Miscellaneous unattached ladders
- 1. Will remove 2
Work bench
- 2. Will add bolts Reactor Auxiliary Building
- 1. Construction items
- 1. Will remove D.C. Switchgear and Battery Rooms
- 1. Communications battery rack
- 1. Will add bolts to wall