ML17244A373

Forwards Info Re Arrangement & Actuation Logic for 1C Safety Injection Pump.Reports That Logic Arrangement Meets Separation & Single Failure Criteria

ML17244A373
Person / Time
Site:	Ginna
Issue date:	02/13/1979
From:	White L ROCHESTER GAS & ELECTRIC CORP.
To:	Ziemann D Office of Nuclear Reactor Regulation
References
TASK-06-07.A3, TASK-06-07.C1, TASK-6-7.A3, TASK-6-7.C1, TASK-RR NUDOCS 7902210190
Download: ML17244A373 (5)

Text

BEGULAT( INFORMATION. DISTRIBUTION STEM (BIDS) i.

ACCESSION NBB i790221 0190 DOC.DATE < 79/02/ I 3 NOTARI ZED ~ NO DOCKET Robert Emmet Ginna Nucl,ear Power Plant, Unit 'I, Roches 05000244 iI'ACIL!50-244 AUTH. NAME AUTHOR AFFILIATION WITE,L.D. Rochester Gas 8 Electric Corp.

RECI.P-NAME RECIPIENT AFFILIATI.ON ZIEMANN,D.L. . Opevating Rectory Branch 2

SUBJECT:

Forwards info re arrangement 8, actuation logic for IC Safety 0 In)ection Pump. Reports that logic arrangement meets separation 8. single failure criteria.

DISTRIBUTION CODE~ AOOI S COP IFS RECEIVED-'LTR ~ ENCL ~

TITLE.~ GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LIC SIZE>

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'EG BEG I P I ENT COPIES IP I ENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL ACTIONS 05 BC eg~~

I NTEBNAL~ 03 G FILE I 02 NRC PDR I 1.2 2 .14 TA/EDO .I 15 COBE .PERF BR I 6 AD S YS/P RO J I 17 ENGR BR .I 1.8 REAC SFTY BR I 19 .PLANT SYS BR I 20 FEB .I 21 EFLT TRT SYS .I 22 BRINKMAN 03 LPDR ,I 04 NSIC I'XTERNAL<

23 ACBS ,16 I FEB

'2 R S7$

TOTAL NUMBER OF COPI ES REQUI BED! LTTB 38 ENCL 38

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RQCHES7ZR GAS 4,'(0 ELI=CTRIC CORPOQ4TIO,'4 89 "-457 4V."=i'I(!8 ROC'" S7""2, H.Y. 146~9

i. CON Q. WH IT K. J R. tg, yea gag VJCt PRC910!NT ~ogA grot sic 0<<6 z i 00 February 13, 1979 Director of Nuclear Reactor Regulation Attention: Mr. Dennis L. Ziemann, Chief Operating Reactors Branch No. 2 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Sub'ect: SEP To ic VII-7, "Acce tabilit of Swin Bus Desi n"

Dear Mr. Ziemann:

The information in this letter is being provided in response to a request from a member of your staff relative to the actuation logic for the 1C Safety Injection Pump. The logic scheme for this pump is such that it can be automatically tied to either safeguards bus 14 or 16, the two redundant sources of emergency onsite power.

However, no single failure can cause parallel operation of the two redundant buses, or cause both buses to be rendered inoperable.

1) Actuation logic for the lA, 1B, and 1C pumps is shown on elementary wiring diagrams 10905-73, 10905-74, and 10905-75, which were included in a comprehensive package of Ginna electrical drawings transmitted to you on November 22, 1978;

2) The arrangement and actuation logic for pump '1C is essentially this: when a safety injection signal is generated, Agastat timer 2/SIP1C2 automatically ties SI pump 1C to bus 14 after 5 seconds by closing breaker 52/SIP1C2. A normally closed contact (b) off breaker 52/SIPlC2 opens when the breaker closes. The opening of this contact will prevent. breaker 52/SIPlCl, which would energize SI pump 1C from safeguards bus 16, from closing.

If Agastat timer 2/SIPlC2 failed, another redundant timer 2/SIP1Cl, would tie Pump 1C to bus 16 by closing breaker 52/SIP1C1 after an additional 2 seconds. A normally closed contact (b) off 52/SIP1C1 would open when this breaker closed, thus further ensuring VBOKZ%0(Ct O

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ROCHESTER CAS AND ELECTRIC CORP. SHEET NO.

DATE February 13, 1979 2 To Director of Nuclear Reactor Regulation that Pump 1C could not be tied to bus 14.

This arrangement meets separation and single failure criteria, since it would require the simultaneous failure of a breaker and a timing relay (Agastat) to tie buses 14 and 16 together through SI Pump 1C.

Very truly yours,