ML20247R926
| ML20247R926 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/31/1989 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| C311-89-2080, NUDOCS 8908080141 | |
| Download: ML20247R926 (3) | |
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GPU Nuclear Corporation Nuclear
=orar8o Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
July 31, 1989 C311-89-2080 U.
S. Nuclear Regulatory Commission Attn: -Document Control Desk Washington, DC 20555
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Inspection Report (IR) 88-16 Emergency Diesel Generator (EDG) Loading Calculations The purpose of this letter is to report the results of calculations requested by the NRC as discussed in Inspection Report (IR) 88-16, dated October 24, 1988 and address a concern reflected in the TMI-1 Systematic Assessment of Licensee Performance (SALP) Report dated April 3, 1989.
GPUN's letter of June 30, 1989 requested a one month extension of our commitment date.
During the inspection (88-16) a concern was identified regarding Ene potential for overloading the Emergency Diesel Generators (EDG)s.
The; inspector challenged one of the assumptions of GPUN's EDG load calculation.
The inspector questioned the assumption in the TDR that heating and cooling loads would not be called upon simultaneously to draw their full rated power.
This concern was also reflected in the SALP Report where it was stated that the load calculations for assuring the adequacy of the EDGs were not well supported.
It should be noted that the 3000 KW load rating quoted in IR 88-16 for TMI-l EDGs is the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating rather than the rating for continuous operation as stated in the Inspection Report.
Accident loading conditions are evaluated at the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> EDG rating.
i Actual load data taken over the winter and spring confirms GPUN's original conclusion that the wm.st case loading of the EDGs would occur during the winter due to heating.
Table 1 documents the seasonal load where the winter and spring loads are based on measurements taken since the inspection and the summer loads are based on previous measurements or conservative estimates.
The greatest seasonal load when combined with the other automatically connected and manually applied loads does not exceed 3000 KW.
8908080141 890731 PDR ADOCK 05000289
%C[
G PNU GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation 7 I l
C311-89-2080 July 31, 1989 The total (automatically connected plus manually connected) EDG load is 2952.0 KW and 2945.0 KW for EDG 1A/B respectively.
The load study is based on loss of offsite power (LOOP), a large break loss of coolant accident (LOCA), and failure of the alternate diesel.
Emergency Procedure 1202-2 " Loss of Offsite Power" requires the operator to monitor the EDG load after automatic loading and prior to the addition of manual loads.
The procedure includes a table listing i
the approximate load (kw and amps) for the Engineered Safeguards (ES) bus loads.
This listing is provided to help the operator avoid inadvertently adding a large load to an EDG when the machine is close to full load.
Based upon the above analysis, it is concluded that the TMI-l Emergency Diesel Generators will not be overloaded at any time including the simultaneous unlikely events of LOOP, loss of one EDG and LOCA.
Sincerely,
^f H. D. Hukill Vice President and Director, TMI-l Attachment HDH/MRK c:
J.
Stolz R. Hernan i
l F. Young W. Russell C.
Anderson i
I i
1 l
l 1
TABLE 1 EMERGENCY DIESEL GENERATOR (EDG) SEASONAL LOADS
- EDG 1A l
COMPONENT WINTER SPRING SUMMER IDENTIFICATION LOAD (KW)
LOAD (KW)
LOAD (KW)
NaOH Heat Trace BS-T-2A 8.6 8.6 8.6 l
Heat Trace Panel 3A-1 7.5 5.2 5.2 I
Heat Trace Panel 3A-2 7.0 6.6 6.6 Heat Trace Panel 4A/7A 14.3 12.1 12.1 Heat Trace Panel 2A 19.3 9.2 9.2 Heat Trace Panel 3A 8.8 7.7 7.7 Heat Trace Panel 2A-1 5.7 5.0 5.0 Control Building Chiller AH-C-4A 52.0 65.2 130.0 EDG Room Heaters AH-E-29A 33.4 5.4 0.0 Screen House Heater AH-C-20A 15.8 0.0 0.0 Screen Ecucc Hester An C-20B 15.8 0.0 0.0 TOTAL SEASONAL LOAD (KW)**
188.2 125.0 184.4 EDG 1B COMPONENT WINTER SPRING SUMMER IDENTIFICATION LOAD (KW)
LOAD (KW)
LOAD (KW)
NaOH Heat Trace BS-T-2B 8.6 8.6 8.6 Heat Trace Panel 3B-1 7.5 5.2 5.2 Heat Trace Panel 3B-2 7.0 6.6 6.6 Heat Trace Panel 4B/7B 11.3 12.1 12.1 Heat Trace Panel 2B-1 5.7 5.0 5.0 Heat Trace Panel 2B 19.3 9.2 9.2 Heat Trace Panel 3B 8.8 7.7 7.7 Boric Acid Mix Tank Heater 1B 15.0 15.0 15.0 EDG Room Heaters AH-E-29B 33.4 5.4 0.0 Screen House Heater AH-C-20C 12.9 0.0 0.0 Screen House Heater AH-C-20D 15.0 0.0 0.0 Fire Pump House Heater AH-C-20E 8.3 0.0 0.0 Chlorine House Heater AH-C-18A 3.9 0.0 0.0 Control Building Chiller AH-C-4B 52.0 65.2 130.0 TOTAL SEASONAL LOAD (KW) 211.7 140.0 199.4
- Heat trace panel load is a summation of measured A and B redundant panel loading.
This supports the wornt case assumption that for single EDG operation, the remaining panel will provide the total heat requirements for both A and B trains.
- Boric Acid Mix Tank HTR 1A was omitted because it trips off on an Engineered Safeguards (ES) actuation.
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