ML17342B409

Documents 870707 Telcon Clarifying Util 870313 Exemption Request for Pulling RHR Sys Logic Circuit Fuses to Preclude Spurious Equipment Operation

ML17342B409
Person / Time
Site:	Quad Cities
Issue date:	07/15/1987
From:	JOHNSON I M COMMONWEALTH EDISON CO.
To:	MURLEY T E Office of Nuclear Reactor Regulation
References
3328K, NUDOCS 8707230446
Download: ML17342B409 (5)

Text

REGULATOR WFORMATION DISTRIBUTION

'S EM (BIDS)DOCKET 05000254 05000265

SUBJECT:

Documents 870707 telcon clarifying util 870313 exemption request for pulling RHR sos logic circuit fuses to preclude spurious equipment operation.

DISTRIBUTION CODE: A001D COPIES RECEIVED: LTR ENCL SIZE: TITLE: OR Submittal:

General Distribution ACCESSION NBR: 8707230446 DOC.DATE: 87/07/15 NOTARIZED:

NO FACIL: 50-254 Quad-Cities Stations Unit ii Commonwealth Edison Co.50-265 Quad-Cities Stations Unit 2i Commonwealth Edison Co.AUTH.NAME AUTHOR AFFILIATION JOHNSON'.M.Commonwealth Edison Co.REClP.NAME RECIPIENT AFFILIATION MURLEYi T.E.Office of Nuclear Reactor Regulationi Director (Post 870411 NOTES: RECIPIENT ID CODE/NAME PD3-2 LA ROSS>T COPIES LTTR E 1 1 CL RECIPIENT ID CODE/NAME PD3-2 PD COPIES LTTR ENCL INTERNAL: ARM/DAF/LFMB NRR/DEST/ADS NRR/DOEA/TSB OGC/HDS1 RES/DE/EIB EXTERNAL: EQhG BRUSKEi 8 NRC PDR NRR/DEST/*DE NRR/DEST/CEB NRR/ILRB EG LE 01 LPDR NSIC

)l'p)I Commonwealt Iso n One First National Plaza, Chicago, Illinois ress ep y to: ost ice ox Chicago, Illinois 60690-0767 July 15, 1987 Mr.Thomas E.Murley, Director Office of Nuclear Reactor Regulation U.S.Nuclear Regulatory Commission Washington, DC 20555

Subject:

Quad Cities Units 1 and 2 Clarification of Information Pertaining to Fuse Pulling to Preclude Spurious Equipment Operation and Safe Shutdown Exemption Requests NRC Docket Nos.50-254 and 50-265

Reference:

Letter from I.M.Johnson to H.R.Denton dated March 13, 1987

Dear Mr.Murley:

On a July 7, 1987 telephone conversation with members of your staff, information and clarification concerning the following items was requested:

1.Clarification oE the Eifth sentence of Section 12.1.1 of the exemption request for pulling RHR system logic circuit fuses to preclude spurious equipment operaton.2.InEormation concerning breaker control power fuse pulling for safe shutdown path L.(Correction to March 13, 1987 letter.)3.The time factor involved in pulling RHR system logic circuit fuses.As a clarification to our exemption request for pulling RHR system logic circuit fuses to preclude spurious equipment operation, the fifth sentence of Section 12.1.1 should read,"These rooms, however, are located in the Northern and Southern Zone Groups and, therefore, could be inaccessible if the Eire occurred in Fire Areas TB-I or TB-III." 8707230446 8707is PDR ADOCN, 05000254 p PDR ool T.E.Murley July 15, 1987 In the above referenced letter, we had inadvertently left out the number of breakers that would have their control power fuses pulled and the time frame for the fuse pulling for safe shutdown path L.These are listed as follows: Safe Shutdown Path Number of Breakers Time Frame 10 19 14 minutes after scram.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> after scram.The number of RHR logic circuit fuses pulled to preclude spurious equipment operation must be pulled within 14 minutes of the reactor scram to ensure that the unit dedicated diesels will be available for powering the safe shutdown makeup pumps.Please direct any questions you may have regarding this matter to this office.Very truly you s, I.M.Johnso Nuclear Licensing Administrator lm cc: T.Ross-NRR NRC Region III Administrator Quad Cities Resident Inspector 3328K