ML20054E547
| ML20054E547 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 06/07/1982 |
| From: | Brey H PUBLIC SERVICE CO. OF COLORADO |
| To: | Kumzycz G, Kuzmycz G Office of Nuclear Reactor Regulation |
| References | |
| FSV-13, P-82-184, P-82169, NUDOCS 8206110333 | |
| Download: ML20054E547 (6) | |
Text
'
r public Service Company
& Cdondo 5909 East 38th Avenue, Denver,' Colorado, 80207 June 7, 1982 Fort St. Vrain Unit No. 1 P-82184 FS V-13 Mr. George Kuzmycz, Project Manager Special Projects Branch Division of Project Management Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Docket No. 50-267
Subject:
Electrical Power Systems
Reference:
P-82169 (Brey to Kuzmycz dated May 28,1982)
Dear Mr. Kuzmycz:
The purpose of this letter is as follows:
1)
To supply ATTACHMENT 4 of P-82169 2)
To. provide an update to page 6 of P-82169, ATTACHMENT 2.
. If you have any questions concerning this matter do not hesitate to call.
Very truly yours, vfp~
p H. L. Brey, Manager Nuclear Engineering Division HLB / MEN:pa 00 t
8206110333 820607 PDR ADOCK 05000g P
ATTACHMENT 4 P-82169 A_TTACHMENT 4 D_ocumenta, tion of Vo,1tage Studi_es, The primary purpose of ATTACHMENT 4 is to document Voltage Studies performed on the electrical system of FSV. This attachment closely correlates with ATTACHMENT 2 previously provided by letter P-82169 dated May 28, 1982.
The following discussion provides clarification to ATTACHMENT 2 open items:
ITEM 1 - ATTACHMENT 2,
Page 2 - Analytical Verification of the Capabilities of the Fort St. Vrain Distribution system When Powered from Offsite Sources:
Item 1 - PSC Discussion, I
Figures 5 and 6 provide data from the analytical studies for the high and low voltage situations.
ITEM 2 - ATTACHMD(T 2, Page 4 - Assumptions Regarding Analysis:
Item 2 - PSC Discussion 1)
Low grid and high grid situation were analyzed 2)
Onsite power was assumed to be unavailable.
3)
Starting of large non-safety related motor at low grid voltage was assumed.
4)
Unit trip and unit startup were considered to represent identical load situations.
(Because non-safety related equipment is being utilized for cooling during this hypothetical situation.
ITEM 3 - ATTACHMENT 2, Page 5 For each event analyzed, the maximum load necessitated by the event and the mode of operation of the plant at the time of the event should be assumed in addition to all loads caused by expected automatic actions and manual action permitted by administrative procedure.
Item 3 - PSC Discussion For the low grid voltage case the manual starting of the 4500 HP Boiler Feedpump was assumed.
Approximately the same loads will be in service regardless of whether the proposed start occurs during routine plant startup or if the start occurs following a unit trip.
ATTACHMENT 4 P-82169 JT.EM 4 - ATTACHMENT 2 Page 6 The vol tage analysis should include documentation for each
- condition analyzed of the voltage at the input and output of each transformer and at each intermediate bus between the connection to the offsite circuit and the terminals of each safety load.
Item 4 - PSC Discussion Figures 5 and 6 provide this information for the safety-related buses. High and low voltage situations are presented.
CONCLUSIONS Low Voltage Case No equipment will be damaged or will fail to operate as a result of this hypothetical situation.
High Voltage Case, No equipment will be damaged or will fail to operate as a result of this hypothetical situation.
1
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ATTACHMENT 2 P-82169 NRC Guideline 6 The voltage at the terminals of each safety load should be calculated based on the above listed considerations and assumptions and based on the assumption that the grid voltage is at the " minimum expected value".
The " minimum expected value" should be selected based on the least of the following:
a.
The minimum steady-state voltage experienced at the connection to the offsite circuit.
b.
The minimum vol tage expected at the connection to the offsite circuit due to contingency plans which may result in reduced voltage from this grid.
c.
The minimum predicted grid voltage from grid stability analysis.
(e.g., load flow studies).
In the report to NRC on this matter the licensee should state planned actions, including any proposed " Limiting Conditions for Operation" for Technical Specifications, in response to experiencing voltage at the connection to the offsite circuit which is less than the " minimum expected value." A copy of the plant procedure in this regard should be provided.
PSC Discussion 6 The mininum expected grid vol tage was based on the minimum experienced value.
NOMINAL MAXIMUM EXPERIENCED MINIMUM EXPERIENCED GRID VOLTAGE GRID VOLTAGE GRID V0LTAGE 230KV 244KV 226KV As indicated previously, a draft Technical Specification, including LC0's will be submitted af ter it has received approval of the Fort St Vrain NFSC.
NRC Guideline 7 The voltage analysis should include documentation for each condition analyzed, of the voltage at the. input and output of each transformer and at each intermediate bus between the connection to the offsite circuit and the terminals of each safety load.
PSC Discussion 7 The analysis is provided by ATTACHMENT 4..
_