ML13319B050
| ML13319B050 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/03/1993 |
| From: | Marsh W Southern California Edison Co |
| To: | NRC/IRM |
| References | |
| NUDOCS 9303080008 | |
| Download: ML13319B050 (3) | |
Text
Southern California Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 March 3, 1993 WALTER C. MARSH TELEPHONE ASSISTANT MANAGER, (714) 454-4403 NUCLEAR REGULATORY AFFAIRS U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Operation and Surveillance of Control Room Emergency Air Treatment System During Permanently Defueled Condition San Onofre Nuclear Generating Station, Unit 1
Reference:
Letter, R. M. Rosenblum (SCE) to Document Control Desk (NRC),
"Operation and Surveillance Requirements for Permanently Defueled Condition for San Onofre Nuclear Generating Station, Unit 1,"
September 21, 1992.
This letter clarifies our plans concerning the operability and surveillance of the San Onofre, Unit 1 (SONGS 1) Control Room Emergency Air Treatment System (CREATS) during the permanently defueled condition. The referenced letter stated that, even though Technical Specification 3.12 requires CREATS to be operable only when the reactor is critical, the system will be maintained operable during the defueled condition. However, after further review of the defueled plant condition, we have determined it appropriate to discontinue operation and surveillance of the system's fresh air intake automatic closure function.
As discussed below, the automatic closure feature of the control room fresh air intake is not required during the defueled condition and, therefore, will not be maintained or surveilled. Specifically, the surveillance required by Technical Specification 4.11.E will no longer be performed. However, closure of the fresh air intake upon manual start of the CREATS fan will continue to be surveilled as part of the normal monthly surveillance required by Technical Specification 4.11.C.
Except for the following surveillance frequency clarification, all of the other requirements of Technical Specification 4.11 will remain in effect until the Permanently Defueled Technical Specifications (PDTS) are in place.
Surveillance of the pressure drop across the HEPA filters and charcoal adsorbers that is required by Technical Specification 4.11.A to be performed at least once per refueling cycle, will be completed every 18 months (or as speci o eventual PDTS).
9303080008 930303 PDR ADOCK 05000206 T-PDR
Document Control Desk
-2 The SONGS 1 CREATS is designed so that the fresh air intake damper closes automatically upon receipt of a containment isolation actuation signal.
However, the need to maintain containment integrity is eliminated once the reactor has been defueled and all of the spent fuel has been stored in the spent fuel pool.
Additionally, Technical Specifications 3.6.2 and 4.3.2 require containment automatic isolation capability only for Modes 1 through 4.
Therefore, the containment isolation system and the CREATS fresh air intake auto-closure feature will not be maintained during the defueled condition. In accordance with the provisions of Technical Specification 4.0.3, surveillance of the CREATS air intake damper auto-closure capability will not be performed during the defueled condition since that CREATS function will be inoperable.
Please contact me if you have further questions on this matter.
Very truly yours, cc:
J. B. Martin, Regional Administrator, NRC Region V S. W. Brown, NRC Project Manager, San Onofre Unit 1 C. W. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2&3 R. F. Dudley, Jr., Section Chief, Non-Power, Decommissioning, and Environmental Project, Directorate of Reactor Projects - 3, 4 and 5
ACCELERATM DOCUMENT DISTR UTION SYSTEM REGULATOW INFORMATION DISTRIBUTION STEM (RIDS)
ACCESSION NBR:9303080008 DOC.DATE: 93/03/03 NOTARIZED: NO DOCKET #
FACIL:50-206 San Ohofre Nuclear Station, Unit 1, Southern Californ 05000206 AUTH.NAME AUTHOR AFFILIATION MARSH,W.C.
Southern California Edison Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
R
SUBJECT:
Clarifies plans re operability & surveillance of CR emergency air treatment sys during permanently defueled condition.Containment isolation sys & fresh air intake auto-D closure feature will not be maintained.
DISTRIBUTION CODE: A003D COPIES RECEIVED:LTR I ENCL 9 SIZE:
S TITLE: OR/Licensing Submittal: Suppl 1 to NUREG-0737(Generic Ltr 82-33)
NOTES:License Exp date in accordance with 10CFR2,2.109 ; ONDD PD ; 05000206 ONDD LA ; DUDLEY,R.
A RECIPIENT COPIES RECIPIENT COPIES D
ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL ONDD:HYLTON, 1
ONDD:WEISS,S 1
D BROWN,S 2
INTERNAL: NRR/
/HHFB11 1
OC/LFMB 1
S 6
FIL 01 1
RES/DSIR/EIB 1
EXTERNAL: NRC PDR 1
NSIC 1
NOTES:
3 R
I D
S A
D D
NOTE TO ALL "RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, S
ROOM P1-37 (EXT. 504-2065) TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 13 ENCL Ar2