ABB DO610 3BHT300006R1 Digital output unit

Description

The AC160 S600 I/O modules listed below are described in Section 5.2.1.1.3 of the topical report
(TR) but are not listed as AC160 Hardware Modules in Table 11-1 of the TR. Since Table 11-1
shows components to the common Q platform that are qualified for use per document 2C48361, it
is unclear why these non-approved modules are being described.
S600 Input / Output Modules
4 AI630 RTD / Resistance Input
5 AI635 Thermocouple Input
6 DI621 Digital Input
7 DO610 Digital Output
Please provide an explanation for why these modules are being described in the Common Q TR
or why they are not listed as approved common Q platform components. The U.S. Nuclear
Regulatory Commission (NRC) staff would like to know if it is Westinghouse Electric
Company’s (Westinghouse) intent to have these modules included as approved common Q
platform components.
Westinghouse Response:
The modules listed in the table above have been superseded by other modules, or they are no
longer being used. Therefore, Revision 2 of the Topical Report will remove those modules from
subsection 5.2.1.1.3.

Use of the terms “Channel” and “Division” throughout the TR is not consistent with industry
accepted terminology. For example, throughout the TR, the term channel is used to denote
redundant implementations of safety applications; however, Section 5.6 of the TR contains a
discussion of AF100 configurations that cross division boundaries. This section also discusses
the use of High Speed Link (HSL) links to cross divisional boundaries. It appears that the terms
are being used in a synonymous manner. These terms are not defined in the Glossary of the TR.
The following definitions are provided in IEEE Std 7-4.3.2 2010.
channel: An arrangement of components and modules as required to generate a single
protective action signal when required by a generating station condition. A channel
loses its identity where single protective action signals are combined. (IEEE Std 603-
2009)
division: The designation applied to a given system or set of components that enables the
establishment and maintenance of physical, electrical, and functional independence from
other redundant sets of components.
It is important for the purposes of this safety evaluation for the NRC staff to understand the
intended context for these terms as they are applied in the TR. Please provide definitions for
these terms relative to how they are used in the TR.

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