ML20138H388

Intervenor Exhibit I-CCANP-81,consisting of Brown & Root Response to Quadrex Finding 4.3.2.1(n), Electrical/I&C Technical Adequacy Assessment

ML20138H388
Person / Time
Site:	South Texas
Issue date:	07/15/1985
From:	AFFILIATION NOT ASSIGNED
To:
References
OL-I-CCANP-081, OL-I-CCANP-81, NUDOCS 8510290024
Download: ML20138H388 (2)

Text

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ELECTRICAL / LLC TECHNICAL QUADREX FINDING NO.

4.3.2. l( n )

ADEQUACY ASSESSMENT C h a "ce Usuc The following findings may have a sericus impact o n.

plant licens-ability or deserve licensing attention:

g0 DCI 10 A9 :44 7

(n) "It is planned that various types of iso-0FF; :,

lation devices will be used. Actual devices EM OG Q~,

are still under evaluation and qualification.

%.h There is no existing document that provides guidance to the designers on the circuit application of these various types (e.g.,

optical couplers vs. fuses vs. relays, etc.).

It is our opinion that lack of such a docu-ment (TRD) could result in design errors and licensing problems (see Question E-14)."

BROWN L ROOT RESPONSE Brown & Root disagrees with the above finding.

STPts

1. As required by Regulatory Guide 1.75 and IEEE-383, the Brown L Root design of STP includes electrical and control circuit isolation devices in applicable locations.

Electrical design drawings as presented to Quadrex symbolically depict the isolatiun devices in the circuits.

Morever, the specification to be used for procuring iso-lation devices was discussed with Quadrex during the review, and covers approximately 98% of the devices needed at STP.

Brown L Root does not believe an additional document on isolation device applica-

.Stf. tion is necessary for the few remaining devicesj B rown L Root also notes that, in the assessment of Brown & Root's i

response to Question E-14, Quadrex states that Brown L Root is l~

delinquent in p rocu ring isolation devices relative to the con-struction schedule and issuance dates of the applicable industry j

standards.

This statement is erroneous.

First of all, final design and layout of the isolation devices is dependent upon the completion of electrical and control circuit design.

Since the design of the l

control circuits is not yet completed, specification and proce rement j

of isolation devices at this time would be p rematu re.

Further, p rocurement of isolation devices after completion of. the circuit i

j design will allow the isolation devices to be located' and grouped I

more efficiently in space reserved for isolation cabinets.

Finally, and most importantly, fully qualified isolation devices are available in the market with little lead time and with no impact on construction schedule.

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Given the foregoing, it is evident that the above Quadrex finding is i

erroneous and will have no impact on plant licensability.

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