ML19332F118
| ML19332F118 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/05/1989 |
| From: | Nandy F SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-59140, NUDOCS 8912130429 | |
| Download: ML19332F118 (3) | |
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.Southem Califomia Edison Company I
23 PARKER STREET 5
IRVINE, CALIFORNIA 92718 F. R. HANDY December 5, 1989 I
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< EAHAGER OF NUCLEAR MCENSING O let 6874400
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lU.= S. Nuclear Regulatory Commission Attention: Document Control Desk-
~ Washington, 0.1C. '20555-
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. Gentlemen:
Subject:
' - Docket ' No. 50-362 l;
- ATWS Rule - (10 CFR 50.62).
N Diverse Emergency Feedwater Actuation San 0nofre Nuclear Generating Station Unit 3
.(TAC; Number.59140)
"c 1.1 August 8,1989_ letter from R. M. Rosenblum (SCE) to Document
References:
l Control Desk -(NRC);
Subject:
Same as above L
l
- 2. iAugust 15,il989 memorandum from M. David Lynch (NRC) to L
John N. Hannon (NRC);
Subject:
Summary-of Meeting with the L
. Combustion Engineering Owners Group:(CE0G) Regarding the DEFAS Design _ Features to be Installed per 10 CFR 50.62 (The ATWS Rule)-
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'This letter:provides the Southern California Edison (SCE) schedule for L'
installation of _ a-Diverse Emergency Feedwater Actuation System (DEFAS) at San Onofre Unit 3 asicommitted to in Reference 1.
In Reference 2 and in telephone s
. conversations, the NRC staff requested that SCE expedite design and procurement to install the DEFAS_ at San Onofre Unit 3 during the upcoming
. Cycle 5 refueling outage which'is -scheduled to begin in April,1990.
l SCE has accelerated conceptual engineering of the DEFAS to define the scope of.
work:and develop _ an engineering plan in response to this NRC schedule request.
In addition, SCE' has initiated-discussions with potential equipment suppliers p
regarding procurement lead times.
Based on these' activities, it has been determined that the design and installation schedule is controlled by the 1 equipment selection, procurement and delivery.
In particular, a Purchase
. Order,for engineered equipment such as control cabinets can not be issued y
. prior,to completion of preliminary engineering.
Material, such'as cable, conduit, etc., will be ordered before completing preliminary engineering to support an expedited fabrication and delivery schedule for the. engineered equipment (such as cabinets and control systems).
Engineered equipment will be ordered promptly following completion of our foSV 8912130429 891205
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Document Corrtrol Desk December 5,.1989 l
. preliminary engineering. This' schedule will also allow lessons-learned from installation of the Diverse Scram System on Unit 2 to be incorporated into the-DEFAS design. At the earliest,' the long-lead-time engineered equipment can be delivered in August 1990, which is. over 2 months after the Unit 3 Cycle 5
- scheduled return to service making it-impossible to commit to installation during that outage. The schedule for significant conceptual engineering tasks completed-and major tasks to be completed is summarized below:
ENGINEERING TASK START-COMPLETE 1.
Develop Project Plan 1-89 7-31-89
- 2. = Review Combustion Engineering 7-31 8-8 Owners Group (CEOG)~ Design 3.
Confirm CE0G Licensing 8-8 8-14
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Assumptions i
4.
Review System Drawings 8-8 8-21 5.
Develop Scope of Work 8-14 8-21 6.
Identify Alternatives 8-14 8-21 j
7.
Prepare. Conceptual 8-21 10-9 Block Diagram 8.
Define Design Criteria 8-21 10-9 9.
Conceptual Engineering 10-9 11-28 Package 10.
Issue Material Requisition 11-28 and Engineered Equipment Letter of Intent 11.
Preliminary Engineering 11-28 3-6-90 12.
Prepare Material and 12-16 3-6-90 Engineered Equipment Specs 13.
Bid Preparation and 3-6-90 4-26-90 Evaluation 14.
Issue Engineered Equipment 4-26-90 Purchase Orders 15.
Final Engineering 3-6-90 7-10-90
- 16. Material Delivery 8-14-90
j' Document Control Desk December 5, 1989 We have investigated further accelerating preliminary design of the DEFAS but find this to be impractical. The technical resources required for the DEFAS preliminary design are also responsible for design of the diverse scram systems installed during the just completed Unit 2 and upcoming Unit 3 refueling outages and the diverse turbine trip to be installed at Unit I during the Cycle 11 refueling outage beginning.approximately June 30, 1990.
To acquire additional resources would necessitate ~ utilizing outside contractors unfamiliar with the ATWS designs. The additional time necessary for familiarization would negate the advantage of additional personnel and in our opinion not result in any acceleration in the schedule.
We understand that DEFAS installation at the next San Onofre Unit 2 refueling outage (the Cycle 6 outage), which is expected to begin in September, 1991, is acceptable to the NRC. Therefore, in order to provide essentially the same schedule for Unit 3, SCE hereby commits to install a DEFAS at Unit 3 immediately after the return to service of Unit 2 from the Cycle 6 refueling outage. This means that, if necessary, Unit 3 will be shut down shortly after Unit 2 return to service to meet this DEFAS installation schedule.
In addition, the DEFAS will be installed earlier at Unit 3 if a prior outage of sufficient duration should occur and the material is available.
Finally, SCE will complete as much work as possible with the unit on line.
SCE understands from the July 12, 1989 meeting, documented in Reference 2, that the NRC has accepted the CE0G generic DEFAS design and requested submittal of the San Onofre Units 2 and 3 specific design for NRC review and approval. SCE will submit a description of the San Onofre DEFAS design, including identification of the differences between the San Onofre design and the CE0G generic design, by March 1, 1990.
If you have any questions or would like additional information concerning this subject, please let me know.
Very truly yours, 4 h.., (&
cc:
J. B. Martin, Regional Administrator, NRC Region V C. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3
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