ML20041G118
| ML20041G118 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 03/11/1982 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| TAC-13110, NUDOCS 8203190286 | |
| Download: ML20041G118 (15) | |
Text
_
%(5 14 m 4se 6ooo 4M Siam Avenue P!ttst>utgh Pa f *.r2 t 9 March 11,1982 W
A.
Director of Nuclear Reactor Regulation D
United States Nuclear Regulatory Commission Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. I t;
- d. lyg
,g Sf/g Division of Licensing
_f. n Axuu s.yOO h 2 Washington, DC 20555 a,
t%fty y p
Reference:
Beaver Valley Power Station, Unit No. 1 DC Docke t No. 50-334, License Number DPR-66 1;
/f Emergency Bus Transient Voltage Regulation g
s Gentlemen:
This letter has been prepared to document the discussion on March,8, 1981 between D. Chaney and A. Ugy of your staf f, K. D. Grada, T. A. thyers and A. Dicioccio of Duquesne Light relative to the revised design concept on the Emergency Bus Transient Voltage Regulation.
In our letter dated December 15, 1981 we had addressed the revised design concept and committed to installation of the automatic tap chang-ing transformers during the current outage.
Presently, we have not received the potential transformers from the suppliers.
These are nec-essary to install the automatic tap changing function for this modifi-cation, and therefore may not install the automatic portion of the tap changer during the current outage. Manual tap changing control will be provided to the operator to assure that the 4KV station service bus voltage will be maintained between 4280-4510 volts.
The automa tic function will be installed af ter receipt of the lotential transformers, at the earliest scheduled outage that will provide time for installation, proof testing, and to complete the necessary operator training on the automatic feature.
If an alternate acceptable means of providing the automatic feature is developed in the interim, and supports the current outage schedule, it will be installed during this outage.
A 30 second delay will be incorporated in the automatic function of the tap changing transformer to prevent operation when anticipated short term voltage transients occur during the start of large 4KV equipment. Aut-omatic tap changing will occur only when the bus voltage is outside the 43601 52 voit deadband for a period greater than 30 seconds. When automatic tap changing occurs, the secondary side tap changer will function to correct the bus voltage at a rate of.625% per step at 5 second increments, until I
the voltage is within the required range.
Hand calculations have shown that 5
the installation of the tap changing transformers will provide voltage control during transient conditions equivalent to the original c.apacitor 7
bank design.
Steady state values for the 4KV and 480V bus voltages will be maintained at a minimum of 98% of their nominal value with the current design specification.
82%3190286 820311 PDR ADOCK 05000334 P
Beaver _ Valley Power Station, Unit No. 1 Docket No. 50-334, License Number DPR-66
- Emergency Bus Transient Voltage Regulation Page 2 The control span for the automatic and manual' voltage adjust is designed for 10%.
Separation of the vital equipment from the Non IE Buses does not occur unless the voltage drop is sustained at 90%
+ 3, - 0 of 4160 volts for 9015 seconds, therefore, spurious trip-ping of the Class IE equipment is not expected with this modification.
The primary tap setting for the transformers is presently based on computer studies, as experience dictates, we will adjust this tap for the optimum setting as determined by our System Planning and Electrical Engineer-ing Departments.
On October 23, 1980 we completed load studies and the computer veri-fication that we committed to perform in our letter dated June 17, 1980.
Although this study was initially performed in anticipation of installing the capacitor banks, the transient calculated values were closely aligned to computer predicted results and consequently, we do not intend to re-perform this study.
We have attached the results and method of this study for your informa-tion and included a copy of the hand calculations which were requested during the conference call.
Very truly yours, 4
J. J.
rey Vice President, Nuclear Attachment cc:
D. A. Beckman, Resident Inspector U. S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA 15077 U. S. Nuclear Regulatory Commission c/o Document Management Branch Washinton, DC 20555 U. S. Nuclear Regulatory Commission Attn:
Mr. D. A. Chaney, Project Manager Operating Reactors Branch No.1 Division of Licensing Washington, D. C. 20555 l
4 Adecuacy of Station Electric Distribution System Voltaces Description of Verification Method With the exception of the 1A bus Reactor Coolant Pump (RCP-1A), station loads on the 1A and 1B 4160V busses that could be operated safely with the main unit off were run simultaneously.
These loads were powered from the 1A 138/4.36KV system station service transformer.
The 138KV bus voltage at the time was noted.
All necessary power, voltage,and current readings were obtained for the steady state condition.
The loads obtained are summarized on the attached Figure 1.
The RCP-1A was then started.
Minimum voltages - and steady state voltages af ter start were recorded.
These' voltages are also summarized on Figure 1.
The measured loads and the 138KV bus voltage prior to
- starting the RCP-1A motor were inputted to the same Wes tinghouse Electric Corporation computer program (Transient Stability) used for previous motor; studies.
The 4160V motors are modeled in this program.
Results The voltages shown in brackets on Figure 1 are the computer results.
They correspond quite accurately to actual readings.
It should be noted tha t the actual readings are subject to at least 2% error due to the meter tolerances.
The only reading outside of this tolerance is the 480V bus 1N1 minimum voltage.
We feel this readingEis in error for the following reasons:
1.
Comparing the loads, readings and study results with those on the 480V bus 1N,_ the minimum voltage test i
reading is suspect.
There was less load on the 1N1 bus than on the 1N bus and the supply transformers are identical.
The reading should therefore be higher than the 1N bus value.
2.
Hand calculations for the IN1 bus minimum voltage indicates this value should be 400V.
_,,,-, - _ _ _. _, ~, __
3.
Hand calculations for the 1N bus minimum voltage verifies the actual reading within 2% error and agrees exact 2y with the computer result of 394V.
Based on these results, we conclude that the~ computer pro-grams used by Duquesne Light Company accurately reflect actual conditions and that previously submitted computer results are likewise accurate.
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