ML20097F548
| ML20097F548 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 06/11/1992 |
| From: | WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | |
| Shared Package | |
| ML20097F545 | List: |
| References | |
| NUDOCS 9206150358 | |
| Download: ML20097F548 (3) | |
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Atteclunent IV to ET 92 0120 Page 1 of 3 ATTACIMENT IV PROPOSED TECIINICAL SI'ECIFICATION C11ANGES 9206150358 920611 PDR ADOCK 05000402 P
Attachment IV to ET 92-0120 Page 2 of 3 ELECTRICAL POWER SYSTEdg JURVEILLANCE REOUIREMENTS (Continued) g.
At least once per 18 months, during shutdown, by:
1) subjecting the diesel to an inspection in accordance with procedures prepared in conjunction with its manufacturer's recommendations for this class of standby service, 2)
Verif inn e i e e
re i t to rn e a. ;na -et pcascc Nan oc cqua.-tc 1052 k.;100. p-r -- t a e s p motor load (the lar est i eme enc load ining - -
equency at 60 1 5.4 35, v
at e
3)
Verifying the diesel generator capability to reject a load of 6201 kW without tripping. The generator voltage shall not exceed 47e4 volte during and following the lead rejection, 4) simulating a loss-of-offsite power by itself, ands a)
Verifying deenergization of the emergency busses and load shedding from the emergency busses, and b)
Verifying the diesel starts *** on the auto-start signal, energizes the emergency busses with permanently connected loads within 12 seconds, energizes the auto-connected shutdown loads through the shutdown sequencer and operates f or greater than or equal to 5 minutes while its generator is loaded with the shutdown loads. -After energization, the steady-stato voltage and frequency of the emergency busses shall be maintained at 4160 + 160 - 420 volts and 60 1 1.2 He during this test.
- This test shall be preceded.by an engine prolube period and/or other warmup procedures recommended by the manufacturer so that the mechanical stress and wear on the diesel engine is minimized.
WOLF CREEK - UNIT 1 3/4 8-4a Amendment No. 8
Attachmsnt IV to ET 92-0120 Page 3 of 3 3/4.8 ELECTRICAL POWER SYSTEMS DASES 2/4.8.1, 3/4.8.2. and 3/4.8.3 A.C.
- SOURCES, D.C.
S OU n.CE S. AND ONSITE POWER DISTRIBUTICN The OPERABILITY of the A.C. and D.C power sources and associated distri-bution systems during operation ensures that sufficient power will be available to supply the safety-related equipment required fors (1) the safe shutdown of the facility, and (2) the mitigation and control of accident conditions within the facility. The minimum specified independent and redundant A.C. and D.C.
power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix A to 10 CTR Part 50.
~
The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The OPERABILITY of the power sources are con-sistent with the initial condition assumptions of the safety analyses and are based upon maintaining at least one redundant set of onsite A.C. and D.C.
power cources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss-of-offsite power and single failure of the other casite A.C. source. The A.C. and D.C.
source allowable out-of-service times are based on Regulatory Guide 1.93, " Availability of Electrical Power Sources", December 1974. When one diesel generator is inoperable, there is an additional ACTION requirement to verify that all required systems, sub-systems, trains, components and devices, that depend on the remaining OPERABLE diesel generator as a source of emergency power, are also OPERABLE, and that the steam-driven auxiliary feedwater pump is OPERABLE. This requirement is intended to provide assurance that a loss-of-offsite power event will not result in a complete loss of safety function of critical systems during the period one of the diesel generators is inoperable. The term verify as used in this context means to administratively check by examining logs or other information to determine if certain components are out-of-service f or main-tenance or other reasons.
It does not mean to perform the Surveillance Requirements needed to demonstrate the OPERABILITY of the component.
The OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that (1) the facility can be maintained in the shutdown or refueling condition for extended time periods, and (2) sufficient instrumentation and control capability are available for monitoring and maintaining the unit status.
The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recominendations of Regulatory Guides 1.9
- ela+yQienn) gageratodet Ca city for Standby Power Supplies,"
(O L^113evision l November 19' 8 1.108, " Periodic Testing of u
a Diesel Genera o ales Usea a1 onsTtTr E16ctric F Systems at Nuclear Power Plants," Revision 1, August 1977 as modified by Amendment No. 8 Jesued on May 29, 1987 and 1.137, " Fuel-Oil Systems for Standby Diesel Genorators,"
Revision 1, October 1979.
Each diesel generator (Do) is provided with an engine overspeed trip to prevent damage to the engine. Recovery from the transient caused by the loss of a large load could cause diesel engine overspeed, which, if excessive, might result in a trip of the engine. The DG lead response characteristics and capability to reject the largest single load without exceeding predetermined voltage and frequency are demonstrated while maintaining a specified margin to the o h _verspeed trip as required by Regulatory, Guide 1.9, Position C.4.
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u-WOLF CRFEK - UNIT 1 B 3/4 8-1 Amendment No. 8 I