ML13330B480

Advises That Results of 1988 mid-cycle Steam Generator Tube Insp Acceptable.All Sleeves in Steam Generator W/O Eddy Current Test Confirmation Identified & Removed from Svc in 1988

ML13330B480
Person / Time
Site:	San Onofre
Issue date:	02/23/1989
From:	Trammell C Office of Nuclear Reactor Regulation
To:	Baskin K Southern California Edison Co
References
TAC-67596 NUDOCS 8903010219
Download: ML13330B480 (4)

Text

• tEG'j4 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 February 23, 1989 Docket No.:

50-206 Mr. Kenneth P. Baskin Vice President Southern California Edison Company 2244 Walnut Grove Avenue, Post Office Box 800 Rosemead, California 91770

SUBJECT:

STEAM GENERATOR TUBE INSPECTION (TAC NO. 67596)

Re:

San Onofre Nuclear Generating Station, Unit No. 1 By letter dated March 25, 1988, in accordance with the San Onofre Unit 1 Technical Specifications, Southern California Edison provided the results of the 1988 mid-cycle steam generator inspection for NRC review. As a result of our review we issued a Request for Additional Information on December 19, 1988, which centered around the exact condition of inservice sleeved tubes.

In February, 1988, San Onofre Unit 1 was shut down for a mid-cycle outage during which a steam generator leak test was performed to identify (and plug) tubes which were leaking. As a result of the investigation to determine the cause of the leaks detected in 19 sleeved tubes, it was identified that there were sleeved steam generator tubes inservice without indications of a required roll expansion.

Based on an extensive evaluation, all sleeves in the San Onofre Unit 1 steam generators without eddy current test confirmation of the presence of required hard rolls were identified and removed from service in December 1988. To identify these sleeves, the 1981 sleeve baseline eddy current data was reevalu ated to establish those sleeves that may not have been properly rolled. This effort utilized the best available analysis techniques and equipment. Those sleeves identified as "missing" roll expansions, based on 1981 eddy current test data, were retested using the most sensitive technique. Any sleeve that did not exhibit the existence of an acceptable roll expansion was identified and the tube was removed from service. This resulted in the plugging of 156 tubes with sleeves that did not exhibit a redetectable hard roll.

A final report dated February 6, 1989, fully describes the discovery, evalua tion and correct actions, as described above, for the steam generator tubes with sleeves without detectable roll expansions.

.3903010219 890223 PDR IDOCK 0 5000206 PDC February 23, 1989 We have reviewed this report and find the actions taken to be acceptable. We have no further questions regarding this matter at this time.

Sincerely, Charles M. Trammell, Senior Project Manager Project Directorate V Division of Reactor Projects -

III, IV, V and Special Projects cc: See next page

Mr. Kenneth P. Baskin San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc Charles R. Kocher, Assistant Mr. Jack McGurk, Acting Chief General Counsel Radiological Health Branch James Beoletto, Esquire State Department of Health Southern California Edison Company Services Post Office Box 800 714 P Street, Office Bldg. 8 Rosemead, California 91770 Sacramento, California 95814 David R. Pigott Mr. Hans Kaspar, Executive Director Orrick, Herrington & Sutcliffe Marine Review Committee, Inc.

600 Montgomery Street 531 Encinitas Boulevard, Suite 105 San Francisco, California 94111 Encinitas, California 92024 Mr. Robert G. Lacy Manager, Nuclear San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS U.S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego 1600 Pacific Highway Room 335 San Diego, California 92101 Director Energy Facilities Siting Division Energy Resources Conservation &

Development Commission 1516 - 9th Street Sacramento, California 95814 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596

2 -

February 23, 1989 We have reviewed this report and find the actions taken to be acceptable. We have no further questions regarding this matter at this time.

Sincerely, original signed.by Charles M. Trammell, Senior Project Manager Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects cc:

See next page DISTRIBUTION Docket File NRC & Local PDRs CTrammell (2)

MVirgilio JLee OGC (f/info only)

PD5 Plant File EJordan BGrimes ACRS (10)

HConrad KWichman CYCHen PD5 D

P5 WCammell:

on 2//)89 2h /89 OFFICIAL RECORD OPY I) I