ML19331B934

Responds to IE Bulletin 80-17, Failure of Control Rods to Insert During Scram at Bwr. Automatic Scram Performed & Scram Discharge Vol Responded Properly.Automatic Scram Test Results Enncl

ML19331B934
Person / Time
Site:	Hatch
Issue date:	08/05/1980
From:	Widner W GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-80-17, TAC-42218, TAC-42219, NUDOCS 8008130556
Download: ML19331B934 (2)

Text

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August 5, 1980 GeorgiaPower u 2. wone,

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n souvvm m :rcgystem U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement

REFERENCE:

Region II - Suite 3100 RII: JP0 101 Marietta Street, NW 50-321/50-366 Atlanta, Georgia 30303 I&E Bulletin 80-17 ATTENTION: Mr. James P. O'Reilly Gentlemen:

The following information is submitted in response to I&E Bulletin 80-17.

In accordance with Item 2 of the Bulletin, an automatic scram was performed on July 31, 1980. The scram discharge volume responded properly, and no problems were noted. The data requested are givea in Attachment 1.

In accordance with Item 3, SDV vent lines were verified to be functional at the conclusion of the above tests.

In accordance with Item 6c, our A/E has completed a 10 CFR 50.59 review covering the operation of the Standby Liquid Control System with both pumps.

The evaluation indicates that the system, as designed, cannot be operated safely with both pumps running and the reactor at maximum ATWS pressure of 1297 psia. Details of the review will be furnished on request.

This completes our response to I&E Bulletin 80-17 and Supplement 2.

Responses to Supplement I will be submitted at a later date.

Please contact this office if you have any questions in this regard.

Very truly yours, YJ. W&

W. A. Widner REB /mb Enclosure worn to and subscribed before me this 5th day of August, 1980.

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Notary Puohc. Georgia, state at targe ff_,,

My Commesson Espres Sept. 20,1983

.5 Notary Public

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xc: Director of the Office of Inspection and Enforcement Director of the Division of Operating Reactors, Offi.ce of Nuclear Reactor Regulation 8008130 gg

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g ATTACHMENT ~l HATCH' UNIT 2' AUTOMATIC SCRAM TEST RESULTS Bulletin 80-17 Item #

Description Results

2a All rod insert times 6.0 sec

. avg. 06 notch insertion, sec 2.412 sec max. 06 notch insertion, sec 4.424 sec min. 06 notch insertion, sec 2.144 sec 2b Scram solenoid valve solenoids deenergized upon receipt of scram signal yes 2c Scram air relieved through backup valves yes Backup valves remained open during presence of scram signal yes 2d

-Time from scram initiation to:

closure of not drained alarm switch 24.7 sec closure of rod withdrawal block switch 40.42 sec closure of reactor scram switch (avg.)

36.07 sec 2e vent valve F010A opening time 7.98 sec vent valve F010B opening time 9.08 sec drain valve F0ll opening time 11.9 sec vent valve F010A closing time 30.43 sec vent valve F010B closing time 32.22 sec

- drain valve F0ll closing time 24.7 sec 2f Delay from scram initiation to closure of vent valve F010A 30.43 sec vent valve F010B 32.22 sec drain valve F0li 24.07 sec 2g SDV~ water analysis filterable solids 2500 ppb turbidity 23 RTU SiO2 28 ppb chlorides less than 50 ppb 2h-Time from scram reset to north SDV bank, SDV switch R0130 clears 7', 45" south SDV bank, SDV switch R013D clears 7', 04" 211 SDV and associated piping free of residual water;following the scram reset Yes 2j 10 sec delay on scram reset

. functioning properly yes 2k-Comparison of results yes RES/mb 8/5/80 l

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