ML13322B052
| ML13322B052 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/21/1989 |
| From: | Trammell C Office of Nuclear Reactor Regulation |
| To: | Ray H Southern California Edison Co |
| Shared Package | |
| ML13322B053 | List: |
| References | |
| TAC-65087 NUDOCS 8911290239 | |
| Download: ML13322B052 (5) | |
Text
A R RE G 0UNITED STATES
-*CNUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 November 21, 1989 Docket No. 50-206 Mr. Harold B. Ray Vice President Southern California Edison Company Irvine Operations Center 23 Parker Irvine, California 92718
Dear Mr. Ray:
SUBJECT:
TDI DIESEL CRANKSHAFT CRACKING PROBLEM, SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 (TAC NO. 65087)
References:
- 1. SCE letter dated January 13, 1989, Transmitting Failure Analysis Associates' Report FaAA-84-12-14 Revision 1.0, titled Evaluation of Transient Conditions on Emergency Diesel Generator Crankshafts at San Onofre Nuclear Generating Station Unit 1.
Subject:
Transient Response of Emergency Diesel Generators.
Subject:
Requests that Engine Start-Stop Cycles not be Counted if Engine Speed does not Exceed 200 RPM.
We have completed our review of your submittals (References 1, 2 and 3) regarding diesel generator crankshaft crack propagation. Our safety evaluation (SE) is enclosed for your information.
Based on our review, we have concluded that you must either (1) replace your diesel engine crankshafts with a design that is not susceptible to cracking or (2) demonstrate that your eddy current inspection technique is capable of detecting 10 mil deep flaws with a high degree of confidence. Also, you should review and revise (as appropriate) your diesel generator oil maintenance procedures to assure that oil quality is properly maintained and impurities in the oil do not exist which could contribute to crack initiation and propa gation. Additionally, we have concluded that diesel engine start-stop cycles with engine speeds maintained less than 200 rpm may be excluded from the start-stop cycles allowed by License Condition 3.L (1) provided that you can demonstrate that the crankshaft stress levels for this situation remain less than the steady state values.
Currently, License Condition 3.L (1) remains in effect which allows you to load each diesel generator to 6000 KW for up to 50 start-stop cycles on each 811290239 '91121 PER ArCCK 0 5 000206 PPD
/020
Harold B. Ray 2 -
November 21, 1989 engine or until the end of Cycle 10, whichever comes first. Your resolution of the remaining items (discussed above) should include consideration to amend License Condition 3.L as appropriate. You may want to consider including any remaining requirements and restrictions relative to the diesel engines in the appropriate limiting conditions for operation and surveillance requirements, thereby eliminating the need fur a specific license condition.
Please provide your submittal adoressing the matter of license condition requirements, along with your resolution of the remaining technical issues, within 90 days of your receipt of this letter.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under Pub. L.96-511.
Please contact us if you should have any questions regarding this request.
Sincerely, CA4"&'.-7 "'g Charles M. Trammell, Senior Project Manager Project Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc: w/enclosure See next page
Harold November 21, 1989 engine or until the end of Cycle 10, whichever comes first. Your resolution of the remaining items (discussed above) should include consideration to amend License Condition 3.L as appropriate. You may want to consider including any remaining requirements and restrictions relative to the diesel engines in the appropriate limiting conditions for operation and surveillance requirements, thereby eliminating the need for a specific license condition.
Please provide your submittal addressing the matter of license condition requirements, along with your resolution of the remaining technical issues, within 90 days of your receipt of this letter.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under Pub. L.96-511.
Please contact us if you should have any questions regarding this request.
Sincerely, original signed by Charles M. Trammell, Senior Project Manager Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc: w/enclosure See next page DISTRIBUTION Docket File NRC & LPDRs CTrammell (2)
JTatum JZwolinski JLee OGC PD5 Plant File EJordan (MNBB 3302)
ACRS (10)
BElliot
- see previous concu ence DRSP/PD5*
R PD5 DR D5 JTatum:dr mammell G
n 11/20/89 11 / 89 11/ 189 OFFICIAL RECORD COPY
[SO1 TDI 75087]
Harold B. Ray
-2 engine or until the end of Cycle 10, whichever comes first. Your resolutipn of the remaining items (discussed above) should include consideration to mend License Condition 3.L as appropriate. We would prefer that you include any remaining requirements and restrictions relative to the diesel engine in the appropriate limiting conditions for operation and surveillance requi ements, thereby eliminating the need for a specific license condition.
Please provide your submittal addressing the matter of license ondition requirements, along with your resolution of the remaining tec ical issues, within 90 days of your receipt of this letter.
The reporting and/or recordkeeping requirements contaip d in this letter affect fewer than ten respondents; therefore, OMB clearance 's not required under Pub. L.96-511.
Please contact us if you should have any quest4ons regarding this request.
Sincere y, arles M. Trammell, Senior Project Manager
. roject Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects Office of Nuclear Reactor Regulation
Enclosure:
Safety Evalua ion cc: w/enclosure See next page DISTRIBUTION NRC & LPDRs CTrammell (2)
JTatum JZwolinski JLee OGC PD5 Plan File EJorda (MNBB 3302)
ACRS 40)
BEll ot D5 DRSP/PD5 DRSP/D:PD5 i:dr CTrammell GWKnighton
.1 /1c/89 11/
/89 11/ /89 OFFICIAL RECORD COPY
[SO1 TDI 75087]
Mr. Harold B. Ray San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc David R. Pigott Mr. F. B. Marsh, Project Manager Orrick, Herrington & Sutcliffe Bechtel Power Corporation 600 Montgomery Street P. 0. Box 60860 San Francisco, California 94111 Terminal Annex Los Angeles, California 90060 Mr. Robert G. Lacy Manager, Nuclear Mr. Phil Johnson San Diego Gas & Electric Company U.S. Nuclear Regulatory Commission P. 0. Box 1831 Region V San Diego, California 92112 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 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 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. John Hickman Senior Health Physicist Environmental Radioactive Managemncnt Unit Environmental Management Branch State Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 Mr. Don Womeldorf Chief Environmental Management California Department of Health 714 P Street, Room 616 Sacramento, California 95814