ML13331A425
| ML13331A425 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/05/1990 |
| From: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML13331A426 | List: |
| References | |
| NUDOCS 9006080108 | |
| Download: ML13331A425 (3) | |
Text
Southern California Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 HAROLD B.
RAY TELEPHONE SENIOR VICE PRESIDENT 714-458-4400 June 5, 1990 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Amendment Application No. 183 Emergency Diesel Generators San Onofre Nuclear Generating Station, Unit 1 This letter requests NRC approval of an amendment application concerning the emergency diesel generators at San Onofre Unit 1. The enclosed Amendment Application No. 183 (Proposed Change No. 220) deletes the existing license condition on the diesel generators and converts its requirements into technical specifications.
DESCRIPTION OF PROPOSED CHANGE License Condition 3.L consists of six individual license conditions (LC).
The description and the disposition of each is described below.
License Condition 3.L(1)
This license condition limits the total connected loads on each diesel engine to 6,000 KW (maximum) and limits the number of engine starts-stops between diesel crankshaft inspections to fifty (maximum).
The proposed change transfers some of these requirements to Technical Specification (TS) 3.7, "Auxiliary Electrical Supply," and the remainder to TS 4.4, "Emergency Power System Periodic Testing."
The proposed change permits starts-stops associated with engine operation at 200 rpm or less to be excluded from the fifty starts-stops limit.
License Condition 3.L(2)
This license condition requires that a diesel maintenance and surveillance program as previously described in Amendment No. 123 be implemented.
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Document Control Desk June 5, 1990 The proposed change transfers this requirement to TS 4.4 and deletes the existing diesel inspection requirement in TS 4.4, which is superceded by the newer requirement.
License Condition 3.L(3)
This license condition incorporates by reference the recommendation made by the TDI diesel generator owners group to perform a major overhaul on each diesel engine once every ten years.
The proposed change transfers the owners group recommendation to TS 4.4.
License Condition 3.L(4)
This license condition requires that oil holes in main journals 8 through 12 on each diesel crankshaft be inspected for cracks at each plant refueling. It requires inspection of additional critical areas at each major engine overhaul.
It requires that if cracks are found, the engine be considered inoperable and the NRC be notified.
The proposed change transfers these requirements to TS 4.4.
License Condition 3.L(5)
This license condition requires both cylinder blocks on each engine to be periodically inspected for cracks. It provides additional inspection requirements for the right cylinder block of diesel engine no. 1 that has a degraded microstructure. It specifies that if certain types of cracks are found, the engine be considered inoperable and the NRC be notified.
The proposed change transfers these requirements to TS 4.4.
License Condition 3.L(6)
This license condition specifies that all diesel starts for testing and surveillance be slow starts, i.e., taking more than 24 seconds, except where a fast start is required either by the plant TS's or for specific maintenance purposes.
The proposed change transfers this requirement to TS 4.4.
REQUESTED SCHEDULE FOR APPROVAL We request your approval of this amendment application by October 1, 1990.
Plant entry into Mode 3 from the coming outage is presently scheduled for November 1, 1990. License Condition 3.L(1), which allows each diesel engine to be loaded up to 6,000 KW (maximum), expires at the end of Cycle 10. As
Document Control Desk June 5, 1990 previously discussed with your staff and explained in our letter of May 16, 1990, "the end of Cycle 10" is interpreted to coincide with plant entry into Mode 3. The basis for this interpretation is that in Modes 4, 5, and 6 no credit is taken for safety injection and the remaining emergency loads on each engine are much lower than 6,000 KW. In Modes 1, 2, and 3, safety injection is credited and the potential for the total emergency load on the engine to approach 6,000 KW exists.
Your approval of this amendment application by October 1, 1990, will enable the requirements contained in the amendment to be incorporated into plant procedures by November 1, 1990.
IMPORTANT CLARIFICATION This proposed change affects TS 3.7 and TS 4.4.
Proposed Change No. 217 (Amendment Application No. 180), dated April 19, 1990, affects portions of these same two sections of the TS with a different set of changes. Since we are requesting approval of both of these changes during the upcoming outage, we are prepared to provide the NRC with updated replacement pages to reflect issuance of whichever application is approved first.
If you have any questions, please call me.
Very truly yours, cc:
J. B. Martin, Regional Administrator, NRC Region V C. W. Caldwell, NRC Senior Resident Inspector, San Onofre J. H. Hickman, California Department of Health Services