ML13309A327
| ML13309A327 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/25/1992 |
| From: | Rosenblum R SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9210010117 | |
| Download: ML13309A327 (3) | |
Text
ACCELERATED DISTRIBUTION DEMONSTRATION SYSTEM L
REGULATO* INFORMATION DISTRIBUTION#STEM (RIDS)
ACCESSION NBR:.9210010l17 DOC.DATE: 92/09/25 NOTARIZED: NO DOCKET #
FACIL:50-206 San Onofre Nuclear Station, Unit 1, Southern Californ 05000206 AUTH.NAME AUTHOR AFFILIATION ROSENBLUM,R.M.
Southern California Edison Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Advises that shedule for completing mods re SFP cooling sys R
be revised & determined that mods will be completed prior to core offload.
DISTRIBUTION CODE: A001D COPIES RECEIVED:LTR I ENCL 0 SIZE: _-
D TITLE: OR Submittal: General Distribution S
NOTES:License Exp date in accordance with 10CFR2,2.109 ; PDNP PD ; 05000206 PDNP LA ; DUDLEY,R. ; MOULTON,J.
/
A RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D
PD5 LA 1
PD5 PD 1
KALMAN,G 2
D INTERNAL: ACRS 6
NRR/DET/ESGB 1
S NRR/DOEA/OTSBll 1
NRR/DST/SELB 7E 1
NRR/DST/SICB8H7 1
NRR/DST/SRXB 8E 1
NUDOCS-ABSTRACT 1
e9 FMB 1
OGC/HDS3 1
REG FILE 01 1
RES/DSIR/EIB 1
EXTERNAL: NRC PDR 1
NSIC 1
NOTES:
4 R
I D
S A
D D
NOTE TO ALL "RIDS" RECIPIENTS:
S PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P1-37 (EXT. 20079) TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL
Southern Caifornia Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 September 25, 1992 R. M. ROSENBLUM Spebr25192TELEPHONE MANAGER OF (714) 454-4505 NUCLEAR REGULATORY AFFAIRS U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Modifications Regarding Spent Fuel Pool Cooling San Onofre Nuclear Generating Station, Unit 1
References:
- 1)
Letter dated May 16, 1990, from SCE to NRC, Amendment Application No. 182, Revised Spent Fuel Pool Cooling Decay Heat Removal Requirements
- 2)
Letter dated July 16, 1990, from NRC to SCE, Issuance of Amendment No. 132 to Provisional Operating License (TAC No. M 76808)
This letter revises the schedule for completing modifications to the SONGS 1 spent fuel pool (SFP) cooling system, as committed in Reference 1. We had previously planned to complete all of the modifications prior to the Cycle 12 refueling outage. Since SONGS 1 will be permanently shut down at the end of the current fuel cycle (Cycle 11), we now expect to complete them prior to core offload.
The SFP cooling system consists of a safety-related pump and heat exchanger, with a spare pump. In Reference 1, we committed to certain permanent modifications to improve the availability of the SFP cooling system and reduce the time for bringing the spare pump online to approximately 30 minutes.
These modifications, which were previously described in References 1 and 2, are as follows:
permanently connect the spare SFP cooling pump to the SFP cooling system using hardware qualified to Seismic Category A and quality class safety-related. This modification was completed in July 1990, during the Cycle 11 refueling outage.
add check valves to the pump piping loops to reduce the potential for backflow through an idle pump. This modification was scheduled for completion prior to the Cycle 12 outage and has not yet been completed.
9210010117 920925 PDR ADOCK 05000206 P
Document Control Desk
-2 provide power to the spare pump from a separate electrical train and upgrade the power supply to safety-related class.
This modification was scheduled to be completed prior to the Cycle 12 outage and has not yet been completed. (During the Cycle 11 outage, the spare pump was connected to a construction power source.)
provide appropriate controls for operation of the spare pump and upgrade these controls to safety-related class. This modification was scheduled to be completed prior to the Cycle 12 outage and has not yet been completed.
At the time we committed to these modifications, we expected that they would all be carried out during normal plant operation prior to the Cycle 12 refueling. As a result of our agreement to permanently cease operation of SONGS 1 at the end of this fuel cycle, we reevaluated our implementation plan and have determined that it is preferable to complete the modifications during an outage to minimize the impact on the electrical distribution system. We now plan to complete the remaining modifications prior to commencing core offload, after SONGS 1 has been shut down at the end of Cycle 11.
Since this new plan results in the upgrade still being completed prior to any additional fuel being transferred to the spent fuel pool, we believe our new plan continues to meet the intent of our previous commitment.
If you have any questions, please call me.
Very truly yours, cc:
J. B. Martin, Regional Administrator, NRC Region V George Kalman, NRC Senior Project Manager, San Onofre Unit 1 J. 0. Bradfute, NRC Project Manager, San Onofre Unit 1 C. W. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2&3