ML20039C297
| ML20039C297 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 12/16/1981 |
| From: | Brey H PUBLIC SERVICE CO. OF COLORADO |
| To: | Kuzmycz G Office of Nuclear Reactor Regulation |
| References | |
| FSV-13, P-81317, NUDOCS 8112290190 | |
| Download: ML20039C297 (5) | |
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.2 & 7 public sen ice company o2 Oscredo cdi December 16, 1981 Fort St. Vrain co Unit No.1 c5 P-81317 S
Fjl/-/3 RECElV80 DEC2 819815 g ara..
Iw Mr. George Kuzmycz g
Special Projects Branch Division of Project Management Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Subject:
Electrical Power Systems
References:
- 1) G-80149 from Tedesco to Warembourg dtd 8/25/80
- 2) G-80150 from Tedesco to Warembourg dtd 8/25/80
Dear Mr. Kuzmycz:
The purpose of this. letter is to summarize PSC's response and activities concerning the above referenced letters, and to provide the present plans for closing out any unresolved items.
i Summary of Activities A complete synopsis of correspondence is provided as Attachment "A".
Outstanding Items
- 1) Verification of Voltage Analysis by Test This item is partially complete.
The Fort St. Vrain 4160V and 480V buses have been analyzed for steady-state conditions at 70%
power.
The analysis was done by utilizing power factor information obtained by test and comparing the calculated results to measured results.
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PDR ADOCK 05000267 P
P-81317 Page 2 December 16, 1981 4
The itens remaining open in this category are as follows:
A)
Veri fy motor starting and operating voltage calculations at the motor terminals of a safety-related actor.
B)
Veri fy that no problems exist at the tenninals of the above motor, and its associated bus, when the motor-driven boiler feedpump is started.
A test to accomplish the above has been written, reviewed, and approved.
However, this test cannot be run for approximately five weeks because of plant conditions associated with the current loop-split modification now being implemented.
Once the test is complete, the data will be compared against the calculated results.
If the resul ts agree, this item can be closed in a matter of days.
If the results are not in agreement, approximately one to three weeks would be required to resolve.
- 2) Sumbit Revised Technical Specification PSC's original submittal, (P-80369, Warembourg to Tedesco, dated October 20,1980) was nade without a complete understanding of what the NRC wanted in a second level undervoltage protection system. This subject was clarified by Alan Udy (HRC Consultant -
EGG Idaho) by telephone on 4-16-81.
Investigations then proceeded to determine the best method of implementing the requested Vol tage Protection.
These investigations quickly revealed that major modi fications
( Addition of two vol tage transformers, 3 undervol tage relays, 3
unde rvol tage relays with time delay, per bus) would be required.
Since PSC was already pursuing the upgrading of the 3 essential 480 switchgear buses for other reasons, it appeared that the most prudent method of implementing the desired protection is to do so when the switchgear is being changed out (two units are scheduled to be replaced during the 3rd refueling,) the remaining units relaying would be modified to provide the same voltage protection as the new units at that time.
It is felt that this is the most viable approach because of the di f ficul ty associated with the timely purchasing of class 1E voltage trans formers and undervoltage relays to modify the existing switchgear.
PSC intends to proceed as outlined above on this item.
E P-81317 Page 3 December 16, 1981 i
The revised Technical SpecificTtion cannot be submitted until the voltage analysis (Item 1) is completed, and cannot be implemented until the new relaying is installed (3rd refueling).
It is PSC intent to provide the requested Technical Specification submittal in a time frame coinciding with the switchgear replacement.
Conclusion It is PSC understanding that the two items discussed are the only remaining open items from the 8-25-80 NRC letters.
Very truly yours, H. L. Brey, fianager Nuclear Engineering Division HLB /vt Attachrent cc: Allen Udy
ATTACH!!ENT A i
2/16/79
-IE 79-04 Information on A'40 occu rence.
This was an information bulletin, no response required 8/25/80
-G-80149 Tedesco to Warembourg.
Compare current design of the Emergency Power Systems with NRC staff positions and 1.
Propose plant modi fications necessary to meet staff positions 2.
Provide a detailed analysis which shows, our facility design has equivalant capabilities and protective features.
Incorporate certain technical specifications into operating license.
8/25/80
-G-80150 Tedesco to Warembourg Determine analytically if, no onsite power is available, the Offsite Power System and the Onsite Distribution System is sufficient to automatically start and operate all required safety loads within their required vol tage rating.
Verify by test 10/15/80
-P-80364 Warembourg to Tedesco Request for extension until December 15, 1980 to submit Tech. Spec. changes.
10/20/80
-P-80369 Swart to Tedesco PSC's reply to G-80149 10/24/80
-P-80373 Swart to Tedesco PSC's reply to G-80149 & G-80150 12/5/80
-P-80425 Warembourg to Tedesco Request for extension to March 1, 1981 to submit Tech.
Spec. changes.
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ATTACHMENT A t
1/16/81
-Alan Udy to NRC & PSC Copy of draf t questions asked per phone conversation with George Kuzmyec & Jack Reesy.
2/17/81
-P-81055 Warembourg to Tedes_co Request for extension on Tech. Spec. submittal until analysis of Electrical System is completed.
3/19/81
-ND-81-0076 Swart to Udy PSC's reply to questions of 1/16/81 from Udy.
4/7/81
-ND-81-0089 Swart to Udy PSC's reply to Udy's for additional information per phone conversation with Mike Niehoff.
4/16/81
-Memo of Conversation Udy to NRC & PSC Memo from Alan Udy stating that he talked with Mike Niehoff and that some questions asked per NRC letter (8/25/80) still needed to be answered.
10/7/81 NDG-81-0334 Henderson to Test T-178 File Power factor and load data acquired for revision to computerized voltage analysis calculations.