ML19330B389

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Submits Summary of Events in Response to IE Bulletin 80-17. LPCI Inverter R44-5003 Declared Inoperable Twice.Normal Supply Breaker to 4 Kv Bus 2F Tripped,Placing Bus on Alternate Feed
ML19330B389
Person / Time
Site: Hatch, Shoreham  Southern Nuclear icon.png
Issue date: 07/14/1980
From: Manry M
GEORGIA POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-80-17, PM-80-709, NUDOCS 8007310527
Download: ML19330B389 (2)


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b Edwin t. Hatch Nuclear Plant 3 m gg AJg : 4I Georgia Power July 14, 1980 PM-80-709 PLANT E. I. HATCH IES 80-17 Prompt Reporting Confirmation United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region II Suite 3100 101 Marietta Street Atlanta, Georgia 30303 ATTENTION: Mr. James P. O'Reilly Below is a summary of events for Units 1 and 2 of Plant Hatch that were reported per IEB 80-17, part 6a. These events were discussed with your Mr. Nolan on July 12, 1960, at 12:00 PM EDT.

Unit 1 On July 11, 1980, the LPCI inverter R44-S003 was declared inoperable twice due to its having tripped at the following times: 1) From 1220 CDT to 1315 CDT and 2) From 2045 CDT to 2140 CDT. In each case, the inverter was inoperative only during the time period when it was tripped. Loss of this inverter removes control power for valves Ell-F007B, and Ell-F015B, rendering the "B" loop of RHR inoperative.

Unit 2 At 0705 CDT on July 11, 1980, the normal supply breaker to 4KV bus 2F tripped, placing the bus on alternate feed. At 1200 CDT, the c1 ternate supply breaker tripped leaving bus 2F de-energized. The following safety related equipment was rendered inoperative: RHR pumps 2C and 2D, RHRSW pump 2C, PSW pumps 2C and 2D, CRD pump 2B, Standby PSW pump 2P41-C002. After a preliminary investigation for the problem was conducted, the bus was re-energized at 1250 CDT. At 1500, while investigating the cause for the breaker trips, a jumper was found to be missing in the < neutral leg of the protective relay -

current loop. The absence of the jumper had caused a false current value to be present in the neutral leg.

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l At 0455 on 7-11-80, HPCI was being used to control reactor pressure following a scram. The motor to valve 2E41-F006 burned up while in use, rendering HPCI inoperative. The motor from valve 2E41-F007 was removed and installed on 2E41-F006. Valve 2E41-F007 was locked in the open position. At 0030 on July 12, 1980, HNP-2-3302 (MOV operability procedure) was sucessfully completed for valve 2E41-F006. At 0330, HPCI was declared operable. ,

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. M,a6ry g Plant Manqger HLS/hh xc: R. J. Kelly W. A. Widner C. L. Coggin R. D. Baker Control Room File

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