ML19310A011
| ML19310A011 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 04/25/1980 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19310A006 | List: |
| References | |
| NUDOCS 8005210019 | |
| Download: ML19310A011 (3) | |
Text
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4 APR 2 51980 MEMORANDUM FOR: [ Thomas A. Ippolito, Chief, Operating Reactors Branch 53, Division of Operating Reactors FROM:
G. Lainas, Chief, Plant Systems Branch, Division of Operating Reactors
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES (TAC 13156)
Plant Name: Fitzpatrick Docket No..
50-333 Responsible Branch: ORB #3 Project Manager:
P. Polk Reviewing Branch: Plant Systems Status: Awaiting Information.
In response to Technical Assistance Request TAC 13156, the Plant Systems Branch has reviewed the licensee's submittal of September 7,1979, and found that additional information is required in order to complete our review.
The enclosed request for additional information should be forwarded to the licensee as soon as possible with a request for response within 45 days.
~
OV G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
Contact:
I. Ahmed, X27174
Enclosure:
Request for Additional Information cc w/ enclosure:
D. Eisenhut P. Polk G. Lainas M. Chiramal D. Tondi I. Ahmed P. Shemanski 8005g10S(q
ENCLOSURE REQUEST FOR ADDITIONAL INF0PyATION REGARDING THE ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEMS VOLTAGES JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333
References:
1.
G.T. Berry, " Evaluation of Operability of Safety-Related Equipment During a Degraded Voltage Condition," October 18, 1976.
2.
W. Gammill, " Adequacy of Station Electric Distribution Systems Voltages," August 8,1979.
3.
P.J. Early, " Adequacy of Station Electric Distribution Systems Voltages," September 7, 1979.
Reference 3 refers to previous correspondence regarding degraded grid voltage protection. The infomation provided therein did not answer all the concerns of Reference 2.
Of specific concern are the following:
1.
Guideline 6 requests that the voltage should be calculated at the terminals of each safety load. Your previous analysis) only shows bus voltages. Please provide safety load terminal voltages in accordance with Guideline 6.
2 2.
As per Guideline 3, please provide safety loads terminal voltage for starting of the largest non-safety load concurrent with fully-loaded Class IE buses and the offsite grid voltage at its minimum value.
3.
Reference 2 states that, "The adequacy of the onsite distri-bution of power from the offsite circuits shall be verified by test to assure that analysis results are valid, Please provide (a) a descri verification and (b)ption of the method for perfoming this the test results.
l 4.
Your previous analysis indicates that you have two independent offsite sources for normal and emergency power; NSS Transformer T2 and NSS Transformer T3.
However, Figure 8.2-1 in the FSAR indicates that there may be several possible cross-ties of the redundant trains which would allow one transformer to supply loads on both trains.
Please provide either safety load terminal voltages for one NSS transformer supplying both trains.
or include limiting conditions of operation (LCOs) in plant technical specifications to prevent any cross-tie of the redundant trains during operation.
I 6