ML20128G570

Provides Description of Technical Support Ctr Computer Open Items Re Spds.Items Can Be Accomplished While Sys on-line W/Minimal Effect on Operation of Sys

ML20128G570
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	07/03/1985
From:	Withers B PORTLAND GENERAL ELECTRIC CO.
To:	Thompson H Office of Nuclear Reactor Regulation
References
TAC-51292, NUDOCS 8507090240
Download: ML20128G570 (3)

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~ INY Bar1 D Wahers Vce Presdent July 3, 1985 Trojan Nuclear Plant Docket 50-344 License NPF-1 Mr. Hugh Thompson, Director Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington DC 20555

Dear Mr. Thompson:

Safety Parameter Display System Our letters of November 23, 1983 and February 15, 1985 provided a schedule of July 1985 for implementation of the Trojan Safety Parameter Display System (SPDS). The SPDS is only one of several functions performed by the Technical Support Center (TSC) computer. The SPDS portion of the TSC computer will be placed into operation for the forthcoming operating cycle, Cycle 8. There remain, however, some open items / issues that require action. For the most part, these items can be accomplished while the system is on-line with a minimal effect on the operation of the system.

These open items are described in the attachment to this letier.

Sincerely,

%r Bart D. Withers Vice President Nuclear Attachment c: Mr. Lynn Frank, Director j C'00 i State of Oregon Department of Energy l jl Mr. John B. Martin Regional Administrator, Region V U.S. Nuclear Regulatory Commission 8507090240 850703 PDR ADOCK 05000344 F PDR 121 SW Sa!rnon Street Portty a Orey:,n 97204

W Trojan Nuclear Plant Mr. H. Thompson Docket 50-344 July 3, 1985 License NPF-1 Attachment Page 1 of 2 TSC Computer Open Items

1. Central Processing Unit In 1984 a fourth central processing unit (CPU) was installed to improve the time response of the TSC Computer. The vendor has been unable to reliably operate the TSC Computer with all four CPUs on-line simultaneously. The SPDS will operate with three CPUs but the time response is slower when multiple users make demands on the system. Vendor representatives are working closely with PGE engineers to resolve this open item.

2. Input Verification Due to the many TSC Computer hardware problems experienced within the last two years, including the CPU problem described above, a point-by~

point input verification has not been completed. However, most SPDS parameters have been favorably compared with control board indications in the control room. It is expected that a detailed and complete input verification will be performed by March 1, 1986 for those items that can be checked during Plant operation, and by startup from the 198' refueling outage for the others.

3. Human Factors Review PGE is developing an ongoing human factors review program. The TSC Computer was evaluated under the Control Room Design Review for control room layout only. The remaining human factors considerations for the TSC Computer will be reviewed under the ongoing human factors review program. This human factors review will be complete by December 1, 1985.

4. SPDS Availability Due to numerous system startup problems within the last two years, the availability of the SPDS has been poor. It is felt that the hardware problems, with the exception of the CPU problem described above, have been satisfactorily resolved. The availability of the TSC Computer will be monitored and reassessed during the forthcoming operating cycle.

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5. As-Built Findings j During an as-built walkdown, it was discovered that the installation of 37 SPDS inputs (out of a total of approximately 450) was not properly completed. Parameters which are affected and the corre-sponding number of inputs for each are listed below. These discrepancies will be corrected by December 31, 1985 for items which do not affect plant operations. Remaining items will be complete by the startup from the 1986 refueling outage.

Parameters Number of Inputs Pressurizer Safety Valve Acoustic Monitor 1 RWST Level 1 Recirc Sump Level 1 Containment Temperature 4 Valve Position Indications RWST to Containment Spray 2 Recire Sump to containment Spray 2 Containment Sump Recire Suction 2 Pressurizer PORV 2 Pressurizer PORV Block Valves 2 Main Steam Line PORVs 4 Main Feedwater Isolation to Steam Generator 4 Steam Dump Valves 12 SAB/3mc 1038G.685