ML20067B890
| ML20067B890 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 12/01/1982 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| LIC-82-390, NUDOCS 8212060438 | |
| Download: ML20067B890 (8) | |
Text
{{#Wiki_filter:. . d Omaha Public Power District 1823 HARNEY 8 OMAHA, NEBRASKA 68102 8 9 TELEPHONE 536-4000 AREA CODE 402 December 1, 1982 LIC-82-390 Mr. Robert A. Clark, Chief U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Operating Reactors Branch No. 3 Washington, D.C. 20555
Reference:
Docket No. 50-285
Dear Mr. Clark:
Adequacy of the Fort Calhoun Station Electrical Distribution System Voltages Omaha Public Power District's letter to the Commission dated May 21, 1982 identified three Class 1E engineered safeguards motors that remained to be evaluated for the subject undervoltage protection issue. The District's evaluation of the raw water pump, charging pump, and containment ventilation fan motors is provided below. The final concern to be addressed for these Class 1E safeguards motors is the potential for motor damage by undervoltage-induced over-i current during normal (i.e., non-accident) plant operation. To complete the undervoltage analysis for the raw water pump motors, the motor speed vs. torque / current curves were obtained from our vendor. As stated in our letter dated March 19, 1982, only one of the four raw water pumps is normally in operation and, thus, the effect of bus undervoltage on this operating motor was analyzed. The attached table of protective relaying device setpoints identifies that the bus supplying this motor will trip l on undervoltage between 72% and 77.3% for normal plant operation. Please note that for accident situations the bus undervoltage trip
- setting is 90% and, thus, the undervoltage analysis for normal oper-ations bounds the accident case. Examination of the attached speed vs.
torque / current curve #492HA598 demonstrates that the raw water pump t motor current would be approximately 200% of full load current for a bus l voltage slightly below 72%. This 200% of full load current would result in a motor overload trip after 45 seconds (value obtained from circuit breaker manufacturer's data) as the attached table details. For the 77.3% undervoltage case, interpolation on curve #492HA598 shows that for a bus voltage of 77.3%, the raw water motor current would be approxi-i mately 160% of full load and, as the attached table shows, this condi-
- tion is annunciated in the control room down to 115% of full load current.
8212060438 821201 PDR ADOCK 05000285 P PDR
Mr. Robert A. Clark LIC-82-390 Page Two Thus, based on the trip protection provided and allowing for operator action as necessary, the District has demonstrated that these motors are protected from possible damage due to undervoltage during all operating conditions. Speed vs. torque / current curves for the charging pump motors at various voltage levels have also been obtained from our vendor and are a ttached. However, the District could not obtain the pump speed vs. torque curve for the charging pumps. In order to complete a valid analysis for the charging pumps, the District conservatively approxi-mated the pump curve by utilizing the motor speed vs. torque curve since these are positive displacement pumps and the motor loading will always be greater than the pump loading. It is apparent from examining the attached motor curves that the charging pump motors are in fact the most lightly loaded of all those motors which are auto-started on an ESF signal. For example, based on the approximated pump load torque curve, the motor current at 70% motor terminal voltage is approximately 114% of full load curren'. This light loading is also apparent from the re-latively law settings of the overcurrent protective devices for the charging pump motors (see the attached table). Since these motors have a service factor of 1.15, the one charging pump which normally runs during plant operation is fully protected from an undervoltage situation. Please note that the May 21, 1982 letter also stated that the District would provide the speed-torque / current curves for the con-tainment ventilation fan motors. The inclusion of these fan motors as an outstanding item was inadvertent, as the discussion regarding the containment vent fans in the District's letter dated flarch 19, 1982 provides the ne, sary operability justification. To summarize the District's position regarding potential damage to any of the Class 1E safeguards loads, it is sufficient to state that all are fully protected at the present voltage relay setpoints and, there-fore, no corrective action is necessary. Sincerely, R i. 9 b W. C. Jones Division flanager Production Operations WCJ/TLP:jmn Attachments cc: LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W. Washington, D.C. 20036
5 of Motor Full Load Current Instantaneous Time Delay Time Delay, Longest Maximum Minimum Undervoltage - b? Class lE, Trip (A Based on Overload few cycles), Starting Time, Protection Delayed Undervoltage Undervoltage Trip During 29 Safeguards Load Fault Trip Trip 72% Trip 77.3% SIAS 90% '4 Protection Locked Rotor (> 300 sec) (< 10 min) (8 sec delay)(17 sec delay)(5 sec delay) %'
- Protection .2%
'$u SI-1A,B Low 976 466 200 115 162 145 110 %2 Pressure S.I. (17.5 sec) (45 sec) (Alarm Only) R2 Pps. 4160v f l SI-3A,B,C High 1770 531 177 160 160 142 110 &N Press. S.I. Pps. (14-55 sec) 5' 480v C l Ma.
j- SI-3A,B,C Contain. 1765 529 177 160 225 200 110 5 ,' Spray Pps. 480v (14-55 sec) g AC-3A,B,C Comp. 1695 509 170 153 145 125 100 E I Cooling Water Pps. (15-55 sec) { 480v* u AC-10A,B,C,D Raw 893 460 200 115 1 180 160 115 Water Pumps 4160v* (16.9 sec) (45 sec) (Alarm Only) VA-3A,B Contain. 2679 .~536 179 160 N/A N/A N/A
! Vent Fans 480v* (14-59 sec) . VA-7C,D.Contain. 2622 524 175 157 N/A N/A N/A Vent Fans 480v* (14-59 sec)
CH-1A,B,C Charging 1823 547 146 128 N/A N/A N/A Pumps 480v*(see note) (13-46 sec)
< s < >
- l OvercTrrent Non-Accident SIAS Condition
. Devices Normal Operation
- Undervoltage Devices N/A - Curves Not Available
,
- Running during normal plant operation .
NOTE: The charging pumps are not Class 1E, but are auto-started during SIAS. '
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Charg ing Pumps CH- I A, a, C. GENERAL ELECTRIC CO. CALCULATED SPEED-TORQUE / CURRENT CURVES 500 500 ' 450 L CURRENT _-,450 400 1 _ T : _- 400 0 : C 350 h 350 0 - R U . R l 300 b TORQUE - E ' 300 ,
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GENERAL ELECTRIC CO. CALCULATED SPEED-TOROUE/ CURRENT CURVES 1000 , , , , , , , , , , , , , , , , , 1000 900 _ l 900
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