ML20151U698
| ML20151U698 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/03/1998 |
| From: | Clifford J NRC (Affiliation Not Assigned) |
| To: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| GL-97-06, GL-97-6, TAC-MA2365, NUDOCS 9809110125 | |
| Download: ML20151U698 (3) | |
Text
p ei6e T N9 C ~
- - ~ - ~
Mr. Harold B. Ray 3
Ex:cutiva Vice Pr:sidnnt South:rn Califomia Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, California 92674-0128
SUBJECT:
RESPONSE TO LETTER REGARDING STEAM GENERATOR EGGCRATE MID-CYCLE OUTAGE INSPECTIONS (TAC NOS. MA2365)
Dear Mr. Ray:
In a letter dated July 15,1998, Southem Califomia Edison (SCE) summarized conclusions reached based on secondary side visual Inspections performed during a mid-cycie outage in March 1998. SCE performed the inspections as a result of the degradation of the steam generator tube support structure (eggerates) observed in the San Onofre Nuclear Generating Station (SONGS) Unit 3 during the last refueling outage.
Your letter concluded that flow accelerated corrosion has been arrested, and that no significant flow-induced vibration occurred since the last refueling outage. Based on this validation of the root cause and corrective actions, you stated that you will not be performing mid-cycle outage inspections on the eggcrates in the future. You further stated that you will continue to conduct inspections of the secondary side of the Unit 3 steam, generators during future refueling outages until it is established that further inspections are not required.
The NRC staff is not aware of any formal commitments by SCE to continue to perform mid-cycle secondary side visualinspections. Thus, SCE's plans to discontinue mid-cycle inspections do not involve a licensing issue. The staff, however, is reviewing SCE's response to Generic Letter 97-06, " Degradation of Steam Generator Intemals." Any staff concerns
- regarding eggerate degradation and cycle length will be addressed as part of that review.
Please contact me at 301-415-1352 if you have any questions.
Sincerely,-
Original Signed By James W. Clifford, Senior Project Manager Project Directorate IV-2 c
Division of Reactor Projects lil/IV l0 1
Office of Nuclear Reactor Regulation Docket No. 50-362 QlSIftlBUTION:
d[o/
t Docket File OGC cc: See next page PUBLIC ACRS PDIV-2 R/F DKirsch, RIV WCFO EAdensam PGwynn, RIV 11me g' WBateman SCoffin, EMEB JClifford EPeyton RWessman DOCUMENT NAME: SOA2305.LTR j
To receive a copy of thle document, Indicate in the box: "C" = Copy without enclosures "E" = Copy with enclosures "N" = No copy OFFICE PDlyG/PM PDIV-2/LA NAME-JClidefd EPeytcn'P DATE 09/3 /98 09/3 /98 OFFICIAL RECORD COPY
- C Y*
b 9909110125 900903 PDR ADOCK 05000362 D U 1*' " " '
G PM j
a uto UNITED STATES
!e j
NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 30666 0001
/
September 3, 1998 Mr. Harold B. Ray Executive Vice President Southem Califomia Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, Califomia 92674-0128
SUBJECT:
RESPONSE TO LETTER REGARDING STEAM GENERATOR EGGCRATE MID-CYCLE OUTAGE INSPECTIONS (TAC NOS. MA2365)
Dear Mr. Ray:
In a letter dated July 15,1998, Southem Califomia Edison (SCE) summarized conclusions reached based on secondary side visual inspections performed during a mid-cycle outage in March 1998. SCE performed the inspections as a result of the degradation of the steam generator tube support structure (eggerates) observed in the San Onofre Nuclear Generating l
Station (SONGS) Unit 3 during the last refueling outage.
Your letter concluded that flow accelerated corrosion has been arrested, and that no significant flow-induced vibration occurred since the last refueling outage. Based on this validation of the root cause and corrective actions, you stated that you will not be performing mid-cycle outage Inspections on the eggerates in the future. You further stated that you will continue to conduct inspr: lions of the secondary side of the Unit 3 steam generators during future refueling outages until it is established that further inspections are not required.
The NRC staff is not aware of any formal commitments by SCE to continue to perform mid-cycle secondary side visualinspections. Thus, SCE's plans to discontinue mid-cycle inspections do not involve a licensing issue. The staff, however, is reviewing SCE's response to Generic Letter 97-06, " Degradation of Steam Generator Intemals." Any staff concerns regarding eggerate degradation and cycle length will be addressed as part of that review.
Please contact me at 301-415-1352 if you have any questions.
Sincerely, f(/$'
J es W. Clifford, Senior Project Manager Project Directorate IV-2 Division of Reactor Projects Ill/lV Office of Nuclear Reactor Regulation Docket No. 50-362 cc: See next page
._. ~
1 l
l Mr. Harold B. Ray September 3, 1998 1
cc:
Mr. R. W. Krieger, Vice President Resident inspector / San Onofre NPS Southern Califomia Edison Company do U.S. Nuclear Regulatory Commission l
San Onofre Nuclear Generating Station Post Office Box 4329 P. O. Box 128 San Clemente, Califomia 92674
' San Cismente, Califomia 92674-0128 Mayor l.
Chairman, Board of Supervisors City of San Clemente County of San Diego 100 Avenida Presidio 1600 Pacific Highway, Room 335 San Clemente, California 92672 l
San Diego, Califomia 92101 Mr. Dwight E. Nunn, Vice President Alan R. Watts, Esq.
Southern Califomia Edison Company Woodruff, Spradlin & Smart San Onofre Nuclear Generating Station 701 S. Parker St. No. 7000 P.O. Box 128 Orange, California 92668-4702 San Clemente, Califomia 92674-0128 l
l Mr. Sherwin Harris Resource Project Manager i
Public Utilities Department i
City of Riverside 3900 Main Street Riverside, Califomia 92522 l
Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower & Pavilion l
611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Mr. Paul Schneringer San Onofre Liaison San Diego Gas & Electric Company P.O. Box 1831 San Diego, Califomia 92112-4150 Mr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramente, Califomia 94234 y
_