ML13330A180
| ML13330A180 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/28/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Dietch R Southern California Edison Co |
| Shared Package | |
| ML13330A181 | List: |
| References | |
| TAC-42090 NUDOCS 8101160415 | |
| Download: ML13330A180 (7) | |
Text
.
UNITED STATES AR'EGULATRYX S1~~
Co Docket No. 50-206 hOVEMBER 2 8 1980 Mr. R. Dietch "3
Vice Presj4dent Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
In April 1980 San Onofre Unit 1 was shut down to repair the leaks identified in the steam generators. Subsequent eddy current inspections identified a large number of tubes that had indications of detectable degradation at the top of the tube sheet. Laboratory examination confirmed that the degradation was associated with caustic intergranular attack.
Following refined inspection techniques to assess the extent of the degra dation, SCE formulated a repair program to reestablish design margins.
Throughout the summer and.fall we met with representatives of SCE and Westinghouse to discuss the proposed repair program. We also had the benefit of several submittals related to the sleeving-as well as two-.site visits.
In addition, SCE sponsored a third party design review of-the sleeving operation on October 23 and 24, 1980. Although NRC staff Qzds-)not a part of the review panel, members were present at and participated in the proceeding.
Copies of the transcript of the October 23 and 24 meeting were provided to us for consideration in our review.
On November 19, 1980; the NRC's Office of Inspection and Enforcement sent SCE a letter confirming staff understanding that SCE will notproceed with the production insertion phase of the repairs until the Office.of Nuclear Reactor Regulation has reviewed and approved.this.phase of the operation.
As a result of our review, we have concluded that SCE may proceed with the production insertion phase of the steam generator tube repairs.
The.
enclosed assessment provides the basis for this conclusion.
I should note that the attached document relates only to the sleeving operation. Prior to authorizing return.to power, the staff must review and approve addit-i-onal aspects of the overall program. The results of the OFFICE SURNAME DATE NRC FORM 318 (9-76) NRCM 0240
- U.S.
GOVERNMENT PRINTING OFFICE: 1979-289-369
2 staff review of those additional aspects will be published in a safety evaluation related to.the restart of Unit 1. For your information, our review'to date indicates that the proposed sleeving is an acceptable approach to tube repair.
Sincerely, Origipa signed De nis M. Crutchfield, Chief
/,-aperating Reactors Branch #5 Division of Licensing
Enclosure:
Interim Assessment DISTRIBUTION cc w/enclosure:
Docket See next page NRC PDR Local PDR ORB Reading DEisenhut rPurple GLianas TNovak RTEdesco HDenton ECase DC'utchfield HSmi'th SNowicki LChandler NSIC TERA ACRS (16)
RVollmer DRoss OI&E (3)
DL: AD/SA NRR: DIR GLainas HDenton OFFICE DLC 5L...... D_.
0ELD.......... E :..DIR.........
DSI.:..DIR...
DL D D SURNAME SNo ki D
- d LChandler RVollmer
__ DRoss______
D A T E DAT O I..........D..
'C FORM 318 (9-76) NRCM 0240 U.S. GOVERNMENT PRINTING OFFICE: 1979-289-369
-2 staff review of those additional aspects will be published in a safety evaluation related to the restart of Unit 1. For your information, our review to date indicates that the proposed sleeving is an acceptable approach to tube repair.
Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Interim Assessment DISTRIBUTION cc w/enclosure:
Docket See next page NRC PDR Local PDR ORB Reading DEisenhut rPurple GLianas TNovak RTEdesco Henton ECase DCrutchfield HSmith SNowicki LChandler NSIC TERA ACRS (16)
RVollmer DRoss OI&E (3)
DL: AD/SA NRR: DIR GLainas HDenton OFFICE)JDL-.ORB.#5.......DL
..0RB.#5....O.ELD.........
O
......... DSI..DIR........DL..D D...
SURNAME SNowicki:cc.
DCrutchfield LChandler R 11 er DRoss RPurple DATE NRC FORM 318 (9-76) NRCM 0240
- U.S.
G iPNTING OF ICE: 1979-289-369
-2 staff review of those additional aspects will be published in a safety evaluation related to the restart of Unit 1. For your information, our review to date indicates that the proposed sleeving is an acceptable approach to tube repair.
Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Interim Assessment DISTRIBUTION cc w/enclosure:
Docket See next page NRC PDR Local PDR ORB Reading DEisenhut rPurple GLianas TNovak RTEdesco HDenton ECase DCrutchfield HSmith SNowicki LChandler NSIC TERA ACRS (16)
RVollmer DRoss OI&E (3)
DL: AD/SA NRR: DIR GLainas HDenton OFFICE D.L..RB. #5....... DL..ORB #5.
O.ELD......... D.E:.DIR.......... DSI:..DIR........DL...D SURNAME SNowicki:cc DCrutchfie d LCh nd.11 RVollmer DRoss RPurple DATE NRC FORM 318 (9-76) NRCM 0240
- U.S.
G RN3 OFFICE: 1979-289-369
7 A
Vto~A REG(/~
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, 0. C. 20555 November 28, 1980 Docket No. 50-206 Mr. R. Dietch Vice President Nuclear Engineering and Operations Southern California Edison Company
.2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
In April 1980 San Onofre Unit 1 was shut down to repair the leaks identified in the steam generators.
Subsequent eddy current inspections identified a large number of tubes that had indications of detectable degradation at the top of the tube sheet. Laboratory examination confirmed that the degradation was associated with caustic intergranular attack.
Following refined inspection techniques to assess the extent of the degra dation, SCE formulated a repair program to reestablish design margins.
Throughout the summer and fall we met with representatives of SCE and Westinghouse to discuss the proposed repair program. We also had the benefit of several submittals related to the sleeving as well as two site.visits.
In.addition, SCE sponsored a third party design review of the sleeving operation on October 23 and 24, 1980. Although NRC staff was not a part of the review panel, members were present at and participated in the proceeding.
Copies of the transcript of the October 23 and 24 meeting were provided to us for consideration in our review.
On November 19, 1980, the NRC's Office of Inspection and Enforcement sent SCE a letter confirming staff understanding that.SCE will notproceed with the production insertion phase of the repairs until the Office of Nuclear Reactor Regulation has reviewed and approved this phase of the operation.
As a result of our review, we have concluded that SCE may proceed with the production insertion phase of the steam generator tube repairs.
The enclosed assessment provides 'the basis for this conclusion.
I should note that the attached document relates only to the sleeving operation.
Prior to authorizing return to power, the staff must review and approve additional aspects of the overall program. The results of the
-2 staff review of those additional aspects will be published in a safety evaluation related to the restart of Unit 1. For your information, our review to date indicates that the proposed sleeving is an acceptable approach to tube repair.
Sincerely, Dennis Crutc, ield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Interim Assessment cc w/enciosure:
See next page
Mr. R. Dietch 3 -
November 28, 1980 cc Charles R. Kocher, Assistant Director, Criteria and Standards General Counsel Division Southern California Edison Conpany Office of Radiation Programs Post Office Box 800 (ANR-460)
Rosemead, California 91770 U. S. Environmental Protection Agency David R. Pigott Washington, D. C. 20460 Sanu el B. Casey Chickering & Gregory U. S. Environmental Protection Three Embarcadero Center Agency Twenty-Third Floor Region IX Office San Francisco, California 94111 ATTN: EIS COORDINATOR 215 Freemnt Street Jack E. Thomas San Francisco, California 94111 Harry B. Stoehr San Diego Gas & Electric Coirpany P. 0. Box 1831 San Diego, California 92112 Resident Inspector c/o U. S. NRC P. 0. Box AA Oceanside, California 92054 Mission Viejo Branch Library 24851 Chrisanta Drive Mission Viejo, California 92676 Mayor City of San Clemente San Clemente, California 92672 Chai rman Board of Supervisors County of San Diego San Diego, California 92101 California Department of Health ATTN:
Chief, Environmental.
Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814