ML17297B805

Forwards Responses to SER Open Item 7.1.3.5 Re Instrumentation & Control Verification,Discussed in 821105 Exit Meeting

ML17297B805
Person / Time
Site:	Palo Verde
Issue date:	11/17/1982
From:	Van Brunt E, Vanbrunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR, ARIZONA, STATE OF
To:	Novak T Office of Nuclear Reactor Regulation
References
RTR-NUREG-0857, RTR-NUREG-857 ANPP-22321-ACR, NUDOCS 8211230092
Download: ML17297B805 (12)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDE)

ACCESSION NBR10211220002 DOC,DATE: 02/11/17 NOTARLD: YES DOCKET FAGIL:sTN<<50 528 Palo Verde Nuclear stationF Unit ii Arizona Publi 05000528 STN 50 529 Palo Verde Nuclear StationF Unit 2i Arizona. Publi 05000529 STN 50-530 Palo Verde Nuclear StationF Unit 32 Arizona Publi 05000530 AUTH BYNAME AUTHOR AFFILIATION VANBRUNT<E.E.

Arizonan State of REiCIP ~ NAME RECIPIENT AFFILIATION NOVAKFT~

Assistant Director for Licensing

SUBJECT:

Forwards responses to SER-Open Item F 1.3.5 re instrumentation 8 control verificationFdiscussed in 821105 exit meeting, DISTRIBUTION CODEo B001S COPIES RECEIVED:LTR.

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Please contact me if you have any further questions.

Very truly yours, 880a ~<au E.

E. Van Brunt, Jr.

APS Vice President, Nuclear Projects ANPP Project Director EEVBJK/ECS/dh Attachment cc:

A. C. Gehr L. Bernabei P. Hourihan E. Licitra A. C. Rogers (w/a)

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STATE OF ARIZONA

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COUNTY OF MARICOPA)

I, A. Carter Rogers, represent that I am Nuclear Engineering Manager of Arizona Public Service Company, that the foregoing, document has been signed by me for Edwin E. Van Brunt, Jr., Vice President Nuclear Projects, 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'behalf, the statements made therein are true.

A. Carter Rog s

Sworn ro before me rhie~4day of Rlowe 1982 Notary Public My Commission expires:

. My Commlsslon'xpIres May 19, 1986

1 ML>f,Qt ysbt aa~i~<3 n~f.timvu3 ytÃ

ATTACHMENT 1 NRC ITEM 81 Remote shutdown panel meters cannot be read by a short operator.

~Res onse:

The plant operators will be trained in the use of the remote shutdown panel, in addition, they will be demonstrating its use.

Any problems found in the use of this panel during training will be appropriately resolved.

NRC ITEM //2 Eyewash stations in the vital battery rooms could splash the cells when it is used; how will APS prevent that?

~Res onse:

The PVNGS 125 vdc vital system is an ungrounded dc system.

There are 60

cells, each with a capacity of approximately 1.5 volts.

The structure of the battery cells is such that the posts, and the attached bus bar are raised off the top of the cell.

Each cell's top has no lips, there-fore water pooling on top of the batteries when the eyewash station is operated is not possible.

In addition, the eyewash station uses an atomized spray which is nonconductive.

We therefore conclude that there is little or no chance of a battery short caused by water splash because of the low cell capacity, raised posts and no cell case lips.

Also grounding of the battery though the spray is precluded by the type of spray and by the system being ungrounded.

The easy access of the shower for personnel safety is of primary importance.

This is done without compromising plant safety with our present system.

NRC ITEM 83 Confirm there are no power cables routed in instrumentation

raceway, and that limit switch contacts can be routed with power cables by design.

~Res onse:

The PVNGS Electrical General Design Criteria states:

1.

"Separate power trays and control trays shall be provided in the vicinity of MCC's and 480-volt switchgear.

In outlying

areas, control cables and 600-volt power cables shall be run in the same tray."

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Attachment 1

Page 2.

2.

"Instrumentation cables shall not share the same raceway with power cables, control cables, or telephone cables."

This criteria is implemented by the Bechtel's computer routing program in the form of raceway/cable compatability checks.

When the cable number is assigned by the engineers, the level of that cable (power, control, instrumentation, etc.) is assigned.

The computer will then only allow that cable to be routed in the raceway compatible with it according to the criteria.

Examples of the separation of instrumentation cable from power and control were shown in the visit confirming this.

Instrumentation cables are used for low-level circuits, computer analog and digital circuits, instrumentation circuits, RTD circuits, and thermo-couple circuits.

Instrumentation cables are No.

16 AWG (2/C, 3/C, 4/C, 7/C, 9/C or 12/C) with 600 volts insulation.

Thermocouple cables which are multipaired are No.

18 AWG wherever practicle.

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