0CAN119507, Notifies of Completion of Station Blackout Diesel Testing Commitments
| ML20094M529 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/17/1995 |
| From: | Mims D ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 0CAN119507, CAN119507, NUDOCS 9511270103 | |
| Download: ML20094M529 (2) | |
Text
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a Entargy operations,Inc.
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-===- ENTERGY mssR m RusscMe, AR 72801 Tel 501858SJ00 November 17,1995 0CANI19507 U. S. Nuclear Regulatory Commission Document Control Desk Mail Station PI-137 Washington, DC 20555
Subject:
Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Notification of Completion of Station Blackout Diesel Testing Commitments Gentlemen:
In a letter dated November 24,1993 (OCNA119310), the NRC staff requested that Arkansas Nuclear' One (ANO) submit written notification following completion of the one-time shutdown equipment load test of the new non safety-related diesel generator (alternate AC power source) in accordance~with Part B.12 of NUMARC 87-00, " Guidelines and Technical Bases for NUMARC Initiatives Addressing Station Blackout at Light Water Reactors." The purpose of this submittal is to provide notification that the ANO-2 testing for the alternate AC diesel generator was successfully completed during the recently completed eleventh refueling outage (2Ril). This testing included the tests described in NUMARC 87-00, section 7.1.2 and Part B.12.
The following testing was completed during 2R11:
a) Design Load Test This test demonstrated the ability of the generator and excitation system to accept the most severe electrical load without experiencing instability resulting in generator voltage collapse, or evidence of the inability of the voltage to recover. This test also demonstrated that suflicient engine torque is available to prevent engine stall and to permit the engine speed to recover when experiencing the most severe load requirement.
b) NUMARC 87-00 Rev 1 Initial Test This functional test demonstrated the entire system by simulating a station blackout.
During this test all the loads on the safety bus were secured and the bus de-energized.
>$Y 9511270103 951117 8 6 PDR ADOCK 05000368 P
U. S. NRC '
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November 17,1995 0CANI19507 Page 2 The control room personnel were notified that a station blackout had been declared and to energize the selected safety bus from the alternate AC diesel. The operators started and aligned the alternate AC diesel within the 10 minute acceptance criterion.
j This test demonstrated that all facets of the alternate AC diesel generator have been successfully incorporated into the station procedures and that if a station blackout were to occur ANO is atle to respond as required.
The testing performed during the 2Rll refueling outage completes ANO's commitments regarding the testing program for the alternate AC diesel as conunitted in our letter to :he NRC dated June 29,1993 (0CAN069302). The ANO-1 portion of the testing program was completed during the IR12 refueling outage earlier this year (ref. OCAN049512).
Should you have questions or comments, please contact me.
Very truly yours,
[
Dwight C. iims Director, Nuclear Safety DCM/dwb cc:
Mr. Leonard J. Callan Regional Administrator U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 NRC Senior Resident Inspector Arkansas Nuclear One P.O. Box 310 London, AR 72847 Mr. George Kalman NRR Project Manager Region IV/ANO-1 & 2 U. S. Nuclear Regulatory Commission NRR Mail Stop 13-H-3 One White Flint North 11555 Rockville Pike Rockville, MD 20852