ML13331B150
| ML13331B150 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/11/1989 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML13331B149 | List: |
| References | |
| NUDOCS 8903170043 | |
| Download: ML13331B150 (4) | |
Text
Attachment 2 Supplement No. 2 Changes to Proposed Change No. 197 890317004:3 890311 PDR ADOCKIc:*
05000206 P
L. Diesel Generators The following requirements shall apply to the standby diesel generators:
(1) Approval to increase total connected loads on each diesel engine to 6000 kW or less is granted pending completion of NRC review of the crankshaft crack propagation analysis prepared by Failure Analysis Associates.
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.
(2) A diesel engine maintenance and surveillance program as described in the Safety Evaluation Report on the Operability/Reliability of Emergency Diesel Generators Manufactured by Imo Delaval, Inc. (TDI),
dated DATE OF FORTHCOMING SER is to be implemented. Changes to this program will be subject to the provisions of 10CFR 50.59.
(3) The frequency of the major diesel engine overhauls shall be consistent with Section IV.1, "Overhaul Frequency," in Revision 2 of Appendix II of the Design Review/Quality Revalidation Report that was transmitted by letter dated June 20, 1986, from M. 0. Medford, (SCE) to G. E. Lear, (NRC).
(4) Oil hole locations in the five most heavily loaded main journals, i.e., journals 8 through 12 on each crankshaft shall be inspected at each refueling outage with liquid penetrant. Indications found shall be evaluated with eddy current testing as appropriate.
During each major engine overhaul, the fillets of the most highly loaded main journals (Nos. 4 through 12) should be inspected together with the oil holes, using liquid penetrant. Indications found shall be evaluated with eddy current testing as appropriate.
In addition, these inspections should be performed for the oil holes and fillets in at least three of the crankpin journals at each major engine overhaul.
If during the refueling outage inspections or the major engine overhaul inspections referred to above, cracks are found in the oil holes or in other crankshaft surfaces, these findings are to be reported to the NRC within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The affected engine is to be considered inoperable and is not to be restored to operable status until the disposition and/or corrective actions have been approved by the NRC staff.
(5) Cylinder blocks shall be inspected for "ligament" cracks, "stud-to-stud" cracks and "stud-to-end" cracks as defined in the report* by Failure Analysis Associates, Inc. (FaAA) entitled "Design Review of TDI R-4 and RV-4 Series Emergency Diesel Generator Cylinder Blocks" (FaAA Report No. FaAA-84-9-11.1) and dated December 1984. (Note that the FaAA report specifies additional inspections to be performed for blocks with "known" or "assumed" ligament
- This report was transmitted to H. R. Denton, (NRC), from C. L. Ray, Jr., (TDI Owners Group), by letter dated December 11, 1984.
-2 cracks.)
The inspection intervals (i.e., frequency) shall not exceed the intervals calculated using the cumulative damage index model in the subject FaAA report. In addition, inspection methods shall be consistent with or equivalent to those identified in the subject FaAA report.
Blocks determined in the future to have "ligament" cracks as the result of the above inspections should be inspected at each refueling outage to determine whether or not cracks have initiated on the top surface, which was exposed because of the removal of two or more cylinder heads.
This process should be repeated over several refueling outages until the entire block has been inspected. If after this process has been completed new "ligament" cracks are found, this process should again be repeated. Liquid penetrant testing or a similarly sensitive nondestructive testing technique should be used to detect cracking, and eddy current testing should be used as appropriate to determine the depth of any cracks discovered.
Whenever diesel generator No. 1 is operated in excess of 4375 kW for one hour or more, a visual inspection of the right bank cylinder block is to be performed under intense light within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after engine shutdown to verify the absence of "stud-to-stud" and "stud-to-end" cracks.
If "stud-to-stud" or "stud-to-end" cracks are found, these findings are to be reported to the NRC within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The affected engine is to be considered inoperable and is not to be restored to operable status until the disposition and/or corrective actions have been approved by the NRC staff.
(6) 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 18 months during shutdown and any other fast start required following specific maintenance involving the fast start capability.
03530
4.4 EMERGENCY POWER SYSTEM PERIODIC TESTING APPLICABILITY:
Applies to testing of the Emergency Power System.
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.
B. The required diesel generators shall be demonstrated OPERABLE:
- 1. At least once per 31 days on a STAGGERED TEST BASIS by:
- a. Verifying the diesel performs a DG SLOW START from standby conditions,
- b. Verifying a fuel transfer pump can be started and transfers fuel from the storage system to the day
- tank,
- c. Verifying the diesel generator is synchronized and running at 6000 kW (+100 kW, -500 kW) for
> 60 minutes,
- d. Verifying the diesel generator is aligned to provide standby power to the associated emergency
- buses,
- 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 is within the acceptable limits as specified by the 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 open between redundant buses at least once per 7 days by verifying correct breaker alignment and power availability.
SAN ONOFRE -
UNIT 1 4-51 0768n