ML17297A765

Forwards Description of Specific Design Changes to Provide for Control of Single Train of Equipment to Maintain Hot Standby Condition & Proceed Into Hot Shutdown Independent of Circuit Failure in Control Room Per Fire Protection Summary

ML17297A765
Person / Time
Site:	Palo Verde
Issue date:	08/28/1981
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Tedesco R Office of Nuclear Reactor Regulation
References
ANPP-18781-JMA, NUDOCS 8109020175
Download: ML17297A765 (10)

Text

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ACCESSION NBRi810 FACILOSTN>>50 528 STN>>50>>529 STN>>50>>530 AUTH~BNAME'AN BRUNT'is E~o REC IP ~ hlAMEI TEDESCOrRBL(

9020175 DOC.OATEN'1/08/28 NOTARIZEDS YES Palo Vei de. Nuclear Statloni Unft ii Ar)zona Publ<

Pa'lO Ve'r de Nuo'le'arE Statdcnr Un) t 2i Ar)ZOna Publ4 Palo Vel de Nuclear Statlonr Unkt 3r Arizona Publ'1 AUTHOR AFF ILIATTON Arizona Publ-$ c Service, Co, RECIPE KNT AF FIL'IATION Assistant Director-for Licensing DOCKET'" 4 05000529 05000530 SUBJECT>: Forwards descr fpt$ on of specific design changes to provide for control of s)ngle train of equipment to maintain hot'tandby cond4t9on L proceed Into hot shutdown independent of c$ rcui t faf lut e' n contr ol r oom per f 5 r e pr otect4 on summa('y.

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P.o. BOX 21666 PHOENIX, ARIZONA85036 August 28, 1981 ANPP-18781 JMA/WFq Mr. R. L. Tedesco Assistant Director for Licensing Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2 and 3

Docket Nos.

STN-50-528/529/530 File:

81-056-026; G.1.10 SEP 01198l>>

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Reference:

Letter from J. Kerrigan, NRC, dated August 3, 1981, subject:

Fire Protection Meeting Summary (Item 3)

Dear Mr. Tedesco:

Attached please find a description of the specific design changes on PVNGS to provide for control of a single train of equipment to maintain a hot standby condition and proceed into a hot shutdown independent of circuit failures in the control room.

This description addresses Item 3 of the reference letter.

If you have any further questions, please contact me.

Very truly yours, CUM E. E. Van Brunt, Jr.

APS Vice President, Nuclear Projects ANPP Project Director EEVBJx/WFQ/av Attachment cc:

J.. Kerrigan (w/a)

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STATE OF ARIZONA

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I, Edwin E. Van Brunt, Jr., represent that I am Vice President Nuclear Projects of Arizona Public Service Company, that the foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority so to do, that I have read such document and know its contents, and that to the best of my knowledge and belief, the statements made therein are true.

Edwin E. Van Brun't>~ Jr. "

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Sworn to before me this 4F day of Pg/J5/

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Attachment to ANPP-18781 JMA/gFq August 28, 1981 Instrumentation The existing design for display of parameters at the remote shutdown panel utilizes parallel 0-10 V signals from the instrument rack in the control room to the main control boards and the remote shutdown panel.

Power to the main control board Model 270 indicator is from the same distribution panel feeder that powers the instrument rack A separate feeder powers the Model 270 indicators at the remote shutdown panel.

A design change for one channel of the following indicated parameters will be implemented:

Pressurizer Pressure Pressurizer Level RCS Hot Leg Temperature Steam Generator 1 and 2 Pressure Steam Generator 1 and 2 Level The design change will provide a power supply and set of signal condition-ing electronics in or near the remote shutdown panel.

The sensor cables will be rerouted from the sensors through a set of transfer switches to the new set of electronics or to the control room instrument racks.

The transfer switches located on or near the remote.shutdown panel will transfer power to the sensors from the control room instrument rack to the remote shutdown panel electronics-Hardware required

.7 1

1 4

14 transfer switches for sensor signals power on-off switch power supply signal converters cables E uipment Control The existing design for equipment control utilizes parallel circuitry between the main control board and the remote point of control, i.e

, switchgear or remote shutdown panel.

A design change for control of one train of devices to maintain hot standby condition and proceed into hot shutdown will be implemented as follows:

Device Atmospheric Dump Valves (2)

Solenoids Remote Point of Control Remote Shutdown Panel Auxiliary Feedwater Control and Isolation Valves (4)

Remote Shutdown Panel Auxiliary Feedwater Pump Diesel Generator Essential Spray Pond Pump ESF Switchgear Diesel Generator Room ESF Switchgear

Device Re te Point of Control Essential Cooling Water Pump Essential Chiller/Chilled Water Circ Pump ESF Switchgear Equipment Room AHUs Charging Pump Class IE Breakers:

Preferred Source (Offsite) Breaker Diesel Generator Breaker ESF Switehgear, ESF Switch'ear" Motor Control Center ESF Switchgear ESF Switchgear Load Center Supply Breakers (6)

Pressurizer Backup Heaters Pressurizer Auxiliary Spray Valve Letdown Isolation Valve Remote Shutdown Panel Remote Shutdown Panel Remote Shutdown Panel RCP Seal Controlled Bleed-off Isol. Valve Remote Shutdown Panel The design change will provide a disconnect switch for each device at its remote point of control-The disconnect switch will isolate any control room circuits which could, as a result of a fire, interfere with local control.

Automatic control functions will not be disconnected unless faults in those circuits can interfere with control.

Hardware required:

12 Disconnect switches for remote shutdown panel controlled devices 16 Disconnect switches at local points of control 26 to 45 cables Anglo Control The existing atmospheric dump valve modulating control utilizes common control cards in the control room instrument rack for both main control board manual control and remote shutdown panel manual control.

The design change will provide separate control cards in or near the remote shutdown panel for one atmospheric dump valve per steam generator.

Valve position sensor and output control cables will be rerouted from the main steam support structure to the new set of electronics through a set of transfer switches, then to the control room instrument racks.

This scheme is the same as that used for the instrument loops.

Hardware required:

2 transfer switches 2 control cards 2 signal converters 8 cables

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