ML13331B148
| ML13331B148 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/11/1989 |
| From: | Baskin K Southern California Edison Co |
| To: | NRC/IRM |
| Shared Package | |
| ML13331B149 | List: |
| References | |
| NUDOCS 8903170033 | |
| Download: ML13331B148 (11) | |
Text
Southern California Edison Company P.O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 KENNETH P. BASKIN TELEPHONE VICE PRESIDENT 818-302-1401 March 11, 1989 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk One White Flint North 11555 Rockville Pike
.Rockville, Maryland 20852 Gentlemen:
Subject:
Docket No. 50-206 Supplement No. 2 to Amendment Application No. 156 San Onofre Nuclear Generating Station Unit 1 By letter dated February 22, 1989, Southern California Edison (SCE) submitted supplemental changes to Amendment Application No. 156, (Proposed Change No. 197), dated November 11, 1988, to the San Onofre Unit 1 operating license. The amendment application and the supplemental changes dealt with resolution of TDI diesel generator issues and consisted of:
(1) A maximum load limit for the monthly diesel surveillance testing required by the Technical Specifications.
(2) A proposed set of license conditions to be applied to the diesel generators.
(3) A description of the contingency plan describing actions that will be taken if cracks are found in the diesel generator crankshafts.
The supplemental changes were the result of a meeting between SCE and the NRC on January 17, 1989.
The enclosed Supplement No. 2 to Amendment Application No. 156 contains changes as the result of more recent discussions between SCE and the NRC staff relating to items (1) and (2) identified above. Supplement No. 2 supersedes the enclosure to the previous supplement dated February 22, 1989. Supplement No. 2 does not affect item (3) above which was presented in the cover letter to the previous supplement.
8903170033 8903:11 PDR ADOCK 0500020-6 P
PDIC
Document Control Desk March 11, 1989 With regard to the "50 start-stops" limit on the diesel engines as proposed in the enclosed license condition No. L(1), in the near future SCE will be submitting another amendment application to increase this limit. Appropriate justification for the increase will be included with the forthcoming amendment application.
If you have any questions or require additional information, please let me know.
Subscribed on this L day of a
, 1989.
Respectfully submitted, SOUTHERN CALIFORNIA EDISON COMPANY By:
Kenneth P. Baskin Vice President Subscribed and sworn to before me this i1LA day ofZ72A /v, 1989, OFFKCUALSEA AROL A.
GMEZ A ~
LOS ANGELES COUNTY PA Cc-. EXireS Feb.
26,199 Notary Public in and foo the County of Los Angeles, State of C ifornia cc: J. B. Martin, Regional Administrator, NRC Region V F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3
- 3. H. Hickman, California Department of Health Services
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of SOUTHERN
)
CALIFORNIA EDISON COMPANY
)
and SAN DIEGO GAS & ELECTRIC
)
Docket No. 50-206 COMPANY (San Onofre Nuclear
)
Generating Station Unit No. 1 CERTIFICATE OF SERVICE I hereby certify that a copy of Supplement No. 2 to Amendment Application No. 156 was served on the following by deposit in the United States Mail, postage prepaid, on the 13th day of March
, 1989.
Benjamin H. Vogler, Esq.
Staff Counsel U.S. Nuclear Regulatory Commission Washington, D.C.
20555 David R. Pigott, Esq.
Samuel B. Casey, Esq.
Orrick, Herrington & Sutcliffe 600 Montgomery Street San Francisco, California 94111 L. G. Hinkleman Bechtel Power Corporation P.O. Box 60860, Terminal Annex Los Angeles, California 90060 Michael L. Mellor, Esq.
Thelen, Marrin, Johnson & Bridges Two Embarcadero Center San Francisco, California 94111 Huey Johnson Secretary for Resources State of California 1416 Ninth Street Sacramento, California 95814 Janice E. Kerr, General Counsel California Public Utilities Commission 5066 State Building San Francisco, California 94102
e
-2 C. J. Craig Manager U.S. Nuclear Projects I, ESSD Westinghouse Electric Corporation Post Office Box 355 Pittsburgh, Pennsylvania 15230 A. I. Gaede 23222 Cheswald Drive Laugna Niguel, California 92677 Frederick E. John, Executive Director California Public Utilities Commission 5050 State Building San Francisco, California 94102 Docketing and Service Section Office of the Secretary U.S. Nuclear Regulatory Commission Washington, D.C.
20555 JaS teA. e liet-f' Soot ern California Edison Company
Description of Supplement No. 2 Changes to Proposed Change No. 197 to the Technical Specifications Provisional Operating License No. DPR-13 Supplement No. 2 to Proposed Change No. (PCN) 197 is a request to revise Section 3.L, "Diesel Generators" of the Provisional Operating License and Section 4.4 "Emergency Power System Periodic Testing" of the Appendix A Technical Specifications for the San Onofre Nuclear Generating Station, Unit 1 (SONGS 1).
Supplement No. 2 supersedes the previous supplement to PCN 197, which was submitted by SCE letter dated February 22, 1989.
DESCRIPTION OF SUPPLEMENTAL CHANGE Subsequent to SCE's submittal of supplemental changes to PCN 197 by letter dated February 22, 1989, additional changes to support increasing the diesel generator loading limit were requested by the NRC. In accordance with this request, the following Provisional Operating License change to revise license conditions applicable to the diesel generators, and a Technical Specification change to incorporate new upper and lower tolerances for the 6000 kW load limit during surveillance testing are proposed in addition to those proposed by PCN 197:
- 1. Revise Section 3.L, "Diesel Generators" of the Provisional Operating License to remove license conditions that have been completed by SCE, incorporate new license conditions, and modify existing license conditions. The status of the existing diesel generator license conditions (LC's) and the proposed changes to these conditions are as described below:
Ll) - This license condition was a one time inspection of selected main journals for cracks. These journals have been inspected and found free of cracks. Therefore, this license condition may be deleted. In place of this license condition, three new license conditions will be added.
The first condition will grant SCE interim approval to increase the total connected loads on each diesel engine to values up to 6000 KW. This approval will remain in effect for up to 50 start-stops on each engine since the last inspection or until the end of Cycle 10, whichever comes first. The basis for the 50 start-stops is the conservative crack propagation analysis, which is described in Failure Analysis Associates Report, "Evaluation of Transient Conditions on Emergency Diesel Generator Crankshafts at San Onofre Nuclear Generating Station Unit 1," dated April 1985.
In the near future, SCE will be submitting another amendment application to increase the "50 start-stops" limit. Appropriate justification for the increase will be included with the forthcoming amendment application.
-2 The second condition will require that an NRC approved diesel engine maintenance and surveillance program be implemented.
The third condition will require that the frequency of major diesel engine overhaul be consistent with the TDI owners group recommendation.
These new license conditions constitute additional requirements which will not adversely impact plant safety.
L2) - This license condition will be revised to specify nondestructive examination methods for inspection of main journals no. 8 through 12 at each refueling outage and for evaluation of any indications that may be found. Additionally, this license condition will incorporate new requirements to inspect the fillets of main journal numbers 4 through 12 and fillets in at least three crankpin journals at each major engine overhaul. If cracks are found in any of these inspections, the NRC will be notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. These revised requirements will not impact plant safety.
L.)
- All piston skirts have been replaced with type AE piston skirts.
Therefore, this license condition has been satisfied and may be deleted. In its place, a new license condition is proposed which requires periodic inspection of cylinder blocks for "ligament" cracks, "stud-to-stud" cracks and "stud-to-end" cracks. If "stud-to-stud" or "stud-to-end" cracks are found, the NRC will be notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. If "ligament" cracks are found (which do not impair engine operability), the inspections will be continued until the entire block has been inspected. If later new "ligament" cracks are found, these inspections will be re-initiated.
This license condition also requires that the right bank cylinder block of diesel generator no. 1 (containing degenerate Widmanstaetten graphite) be visually inspected under intense light after significant loading of the diesel to verify the absence of "stud-to-stud" and "stud-to-end" cracks.
This new license condition will not adversely affect plant safety.
L4) - This license condition remains unchanged.
L5) - This license condition was implemented to ensure that confirmatory load tests of the major loads on the diesel generators were completed. As documented in SCE to NRC letters dated December 29, 1988 and January 20, 1989, the requirements of this license condition were completed and, therefore, it will be deleted.
L6) - This license condition required evaluation and recertification of the charging pump motors, and replacement if necessary. The evaluation and recertification of the charging pump motors was completed as documented in SCE to NRC letters dated September 22, 1988 and December 29, 1988. Per these references, this work has been completed and, therefore, the license condition will be deleted.
-3
- 2. Revise Specification 4.4 "Emergency Power System Periodic Testing" to specify a new load limit and tolerances associated with this limit for monthly surveillance testing of the diesel generators. The diesel generator allowable test load will be increased from the existing limit of 4500 kW +/- 5% for > 60 minutes 5250 kW +/- 5% for a brief period to 6000 kw (+ 100 kW, -
500 kW) for > 60 minutes EXISTING LICENSE CONDITIONS AND TECHNICAL SPECIFICATION See Attachment 1.
PROPOSED LICENSE CONDITIONS AND TECHNICAL SPECIFICATION See Attachment 2.
SIGNIFICANT HAZARDS CONSIDERATION ANALYSIS Supplement No. 2 to PCN 197 to revise diesel generator license conditions and to incorporate a new maximum value for surveillance testing of the diesel generators is being submitted at the request of the NRC. The proposed license conditions are based on resolution of issues regarding TDI diesel generators. These license conditions include deleting conditions that have been completed, adding new conditions that require component inspections and reporting, and implementation of a comprehensive diesel maintenance and surveillance program in accordance with discussions held with the NRC staff.
The basis for the proposed test load limit is described below. It also forms the basis for the proposed connected load limit of 6000 kM.
As discussed in the Technical Evaluation Report providing the Review and Evaluation of Transamerica Delaval, Inc., Diesel Engine Reliability and Operability - San Onofre Nuclear Generating Station Unit 1, prepared by Pacific Northwest Laboratory (PNL-5304) dated November 1984, onsite preoperational tests of both diesel generators included no load tests, a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> run at 100% load, and a 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> run at 110% load (6600 KW). In addition, special function tests have been performed following major engine modifications and inspections. After the AF pistons were modified in 1982, both engines were subjected to special tests consisting of a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, full load run (22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> at 6000 kW and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at 6600 kW).
In 1984, this test was repeated following the sampling inspection. The results of this testing were satisfactory as discussed in PNL-5304. Based on these results, it is concluded that the proposed surveillance testing band will adequately confirm the ability of the diesel generators to satisfy emergency service demands while not introducing unacceptable testing conditions.
-4 SAFETY AND SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION Based on the Safety Evaluation provided in Amendment Application No. 156 and the information provided above, it is concluded that:
(1) Supplement No. 2 change to Proposed Change No. 197 does not involve a significant hazards consideration as defined by 10CFR50.92; and (2) there is reasonable assurance that the health and safety of the public will not be endangered by the proposed change. -
Existing License Conditions and Technical Specifications -
Supplement No. 2 Changes to Proposed Change No. 197 02850
.0 0
Existing License Conditions and Technical Specifications
L. Diesel Generators The 1 esee s request dated June 22, 1988, as supplemented July 15, 19, 21i and 22, 1988, to raise the rating of the diesel generators from 4500\\k4(+5%) to 5250 kW (+/-5%) until the next refueling outage is approved, subject to the following:
(1) Main journals no. 8 and 9 on diesel-generator no. 1, and main journals no. 9 and 10 on diesel-generator no. 2 are to be inspected prior to plant operation and found to be free of cracks.
(2) Journals no. 8 through 12 on both diesel-generator units are to be inspected at the next refueling outage and each subsequent refueling outage until the issue of crankshaft cracking has been resolved.
(3) All piston skirts are to be replaced with type AE at the next refueling outage.
(4) All diesel starts for testing and surveillance will be slow starts (greater than 24 seconds duration) except for the fast start required by Technical Specification 4.4.F conducted once per 7/22/8 18 months during shutdown and any other fast start required following specific maintenance involving the fast start capability.
(5) The licensee will conduct confirmatory load tests of the major loads on the diesel generators buses to confirm the accuracy of the calculated loads contained in its letter of July 15, 1988, and report the results to the NRC staff.
(6) Within 60 days the licensee will evaluate the existing motors and try to provide a certification of the charging pump motors to at least 700 horsepower with a service factor of 1.15. If the evaluation is unsuccessful, SCE will provide motors with NEMA rating of 800 horsepower by either rewinding the existing motors or replacing the motors. In the event rewinding or replacement is required, every effort will be made to accomplish this during the upcoming Cycle X refueling outage; however, if this is not possible, at least 60 days prior to the end of that outage SCE will provide for NRC approval the schedule for rewinding or replacement and further justification for plant operation beyond that outage.
SAN ONOFRE -
UNIT 1
-5a-Revised: 7/27/88
.0 0
4.4EI4 RGECY~P~E.SYTEMPERIODIC TESTING 4.4 temGNC 82 APPLICABILITY:
. p ies to testing of the Emergency Power Syste.
18 OBJECTIVE:
To verify that the Emergency Power System will respond promptly and properly when required.
SPECIFICATION:
A. The required offsite circuits shall be determined OPERABLE at least once per 7 days by verifying correct breaker alignments and power availability.
84 B. The required diesel generators shall be demonstrated 11/14/84 OPERABLE:
- 1. At least once per 31 days on a STAGGERED TEST BASIS by:10
- a. Verifying the diesel performs a DG SLOW START 105 from standby conditions,
- b. Verifying a fuel transfer pump can be started and
- tank,
- c. Verifying the diesel generator is synchronized 105 and running at 4500 kW :1 5% for > 60 minutes, 7/22/88 to include a brief load increase to 5250 kW t 5%,
- d. Verifying the diesel generator is aligned to provide standby power to the associated emergency
- buses, 4
- e. Verifying the day tank contains a minimum of 290 gallons of fuel, and
- f. Verifying the fuel storage tank contains a minimum of 37,500 gallons of fuel.
- 2. At least once per 3 months by verifying that a sample of diesel fuel from the required fuel storage tanks 84 is within the acceptable limits as specified by the 11/14/84,.
supplier when checked for viscosity, water and sediment.
C. AC Distribution
- 1. The required buses specified in Technical Specification 3.7, Auxiliary Electrical Supply, shall be determined OPERABLE and energized from AC sources other than the diesel generators with tie breakers I open between redundant buses at least once per 7 days 4/1/77 by verifying correct breaker alignment and power availability.
SAN ONOFRE -UNIT 1 4-51 7/27/88