ML20151U551
| ML20151U551 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 02/05/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Harold Denton, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.F.2, TASK-TM NUDOCS 8602110048 | |
| Download: ML20151U551 (3) | |
Text
Duxe Powen Go>mm P.O. IlOX 30180 CitAllLOTTE, N.O. 28242 HALB.Tt'CKER tris.pnowa vmm reassment (704) 07:D-4531 mwtaan enomsm February 5, 1986 Mr. Harold R.
Denton, Director Office of Nuclear Reactor Regulation U.
S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Mr.
B. J. Youngblood, Project Director PWR Project Directorate No. 4 Re:
Catawba Nuclear Station Docket Nos. 50-413 and 50-414
Dear Sir:
On September 25, 1985, representative from the NRC Staff, Westinghouse Electric and Duke Power met at the Catawba site to review the implementation of inadequate core cooling instrumentation (ICCI) at Catawba.
The meeting was documented in a November 7, 1985 meeting summary by the Staff.
Comments on the meeting summary were submitted by my letter of January 8, 1986.
The purpose of this letter is to clarify certain aspects of the ICCI system.
The ICCI system is discussed in Section 1.9 of the Catawba FSAR in response to TMI Item II.F.2.
The system is described in terms of its three subsystems - Subcooling Margin Monitor (SMM), Core Exit Thermocouples (CET) and Reactor Vessel Level Indication System (RVLIS).
As shown on the attached fi gure, the ICCI System utilizes the Class IE Westinghouse microprocessor system, ICCM-86, to perform all three functions.
Inputs from the Reactor Coolant System are processed by the microprocessor system and displayed by the plant computer and the plasma display.
All three functions (SMM, CET and RVLIS) are displayed on both displays.
Also the plasma display trends SMM and RVLIS for the previous 30 minutes and trends the five highest CETs per train for the previous 40 minutes, p$b f/
- t G602110040 G60205 PDR ADOCK 05000413 p
PDR L,,
Mr. H2rold R. Denton, Dir ctor February 5, 1986 Page Two The ICCI System shown on the attached figure depicts the upgraded system for Catawba Unit 2.
The ICCI System for Catawba Unit I will be upgraded to the same configuration during the first refueling outage.
Very truly yours,
/
Wb&
Hal B. Tucker ROS:slb Attachment cc:
Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Catawba Nuclear Station
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