Text

LLC Response to NRC Request for Additional Information No. 430 (Erai No. 9411) on the NuScale Design Certification Application
	ML18164A394
Person / Time
Site:	NuScale
Issue date:	06/13/2018
From:	Rad Z; NuScale
To:	; Document Control Desk, Office of New Reactors
References
	RAIO-0618-60436
	Download: ML18164A394 (46)
	v • d • e

RAIO-0618-60436 June 13, 2018 Docket No.52-048 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738

SUBJECT:

NuScale Power, LLC Response to NRC Request for Additional Information No.

430 (eRAI No. 9411) on the NuScale Design Certification Application

REFERENCE:

U.S. Nuclear Regulatory Commission, "Request for Additional Information No.

430 (eRAI No. 9411)," dated April 23, 2018 The purpose of this letter is to provide the NuScale Power, LLC (NuScale) response to the referenced NRC Request for Additional Information (RAI).

The Enclosure to this letter contains NuScale's response to the following RAI Question from NRC eRAI No. 9411:

18-45 This letter and the enclosed response make no new regulatory commitments and no revisions to any existing regulatory commitments.

If you have any questions on this response, please contact Steven Mirsky at 240-833-3001 or at smirsky@nuscalepower.com.

Sincerely, Zackary Z ackary W. Rad

Director, Di t Regulatory R l t Affairs Aff i NuScale Power, LLC Distribution: Gregory Cranston, NRC, OWFN-8G9A Samuel Lee, NRC, OWFN-8G9A Prosanta Chowdhury NRC, OWFN-8G9A : NuScale Response to NRC Request for Additional Information eRAI No. 9411 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com

RAIO-0618-60436 :

NuScale Response to NRC Request for Additional Information eRAI No. 9411 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com

Response to Request for Additional Information Docket No.52-048 eRAI No.: 9411 Date of RAI Issue: 04/23/2018 NRC Question No.: 18-45 Title 10 of the Code of Federal Regulations (10CFR) Section 52.47(a)(8) requires an applicant for a design certification to provide a final safety analysis report (FSAR) that must include the information necessary to demonstrate compliance with any technically relevant portions of the Three Mile Island requirements set forth in 10 CFR 50.34(f), except paragraphs (f)(1)(xii),

(f)(2)(ix), and (f)(3)(v). Section 10 CFR 50.34(f)(2)(iii) requires an applicant to "Provide, for Commission review, a control room design that reflects state-of-the-art human factor principles prior to committing to fabrication or revision of fabricated control room panels and layouts.

Chapter 18, Human Factors Engineering, of NUREG-0800, Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition, and NUREG-0711, "Human Factors Engineering Program Review Model, identify criteria the staff uses to evaluate whether an applicant meets the regulation. The FSAR, Tier 2, Section 18.0, "Human Factors Engineering - Overview," indicates that the HFE program incorporates the applicable guidance provided in NUREG-0711, Revision 3.

Chapter 18, Human Factors Engineering, of NUREG-0800, Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition, lists NUREG-0711, "Human Factors Engineering Program Review Model, and NUREG-0700, Human-System Interface Design Review Guidelines, as the sources of acceptance criteria the staff uses to evaluate whether an applicant meets the regulation.

NUREG-0711, Criterion 8.4.3(1), states that the topics in the applicants style guide(s) should address the scope of human-system interfaces (HSIs) included in the design, and address their form, function, and operation, as well as the environmental conditions in which they will be used that are relevant to human performance.

NUREG-0711, Criterion 8.4.4.1(6) States that, the characteristics of the applicants HSIs should support human performance under the full range of environmental conditions, ranging from normal to credible extreme conditions, such as loss of lighting and of ventilation. For the Remote Shutdown Facility and Local Control Stations (LCSs), the applicants Human Factors Engineering (HFE) design should consider the ambient environment (e.g., noise, temperature, contamination) and the need for and type of protective clothing.

NUREG-0700, Section 12, Workplace Design, states, environmental factors that can have NuScale Nonproprietary

important effects on operators' performance include thermal comfort, illumination, the auditory environment, and facility layout.

NuScale provided technical report ES-0304-1381-P, Rev 1, Human-System Interface Style Guide, which includes guidance for the review of general workplace considerations including thermal comfort, illumination, auditory environment and facility layout in section 3.7, Workplace Design. The staff reviewed the guidance in this report and made the following observations.

Style Guide Section 3.7.2, Main Control Room Requirements and Guidelines, identifies design-specific guidelines for the Main Control Room that conform to the guidelines in NUREG-0700 that help to ensure that the MCR design supports human performance under the full range of environmental conditions by ensuring that adequate lighting, ventilation, and noise reduction are available during normal and credible extreme conditions such as loss of lighting and ventilation. The Style Guide, Section 1.0, Introduction, states that the guidance in the Style Guide is for work location and workstation design at NuScale and that the scope of the standard covers all aspects of plant design, however the majority of the guidelines listed in the Style Guide Section 3.7, Workplace Design, state that they are applicable to either the MCR or LCS(s).

1. Clarify if the guidance in the Style Guide, Section 3.7, Workplace Design, is also applicable to the design of the Remote Shutdown Station (RSS) and Technical Support Center (TSC).

2. Discuss how RSS HSI characteristics support human performance under a full range of environmental conditions and how NuScale considered the ambient environment and the need for and type of protective clothing in the design of the RSS.

3. Please revise the Style Guide or other documents as necessary.

According to HSI RSR Section 4.5.5, Volume III System HSI Description and Display Page Examples, Volume III of the HSI Style Guide contains chapters containing specific information about a system, location, or concept in a NuScale Plant. Chapter topics include work location specific information for the MCR, TSC, RSS, Emergency Operations Facility (EOF) and LCS.

The staff reviewed Volume III of the Style Guide and did not find work specific information or chapters containing specific information about the TSC, RSS, EOF and LCS.

4. Please provide information in Volume III of the Style Guide regarding specific information for workstations and HSI available in the TSC, RSS, EOF and LCS.

In particular for the TSC and RSS, ensure that information is provided about the Video Display Units including how many are available in the work locations for monitoring and/or controlling the status of the NuScale Power Modules (NPMs) and common plant systems, and why this number is adequate.

5. Please revise the Style Guide or other documents as necessary.

NuScale Nonproprietary

NuScale Response:

Response to item 1:

The Human-System Interface Style Guide (HSI SG) is applicable to the remote shutdown station (RSS). Section 3.7, Workplace Design of the HSI SG includes the RSS by example, but the subsequent sections only provide specific guidance on the main control room (MCR) and local control station (LCS) design criteria. The intent is to apply the MCR design criteria to both the MCR and the RSS. HSI SG Section 3.7 has been revised to ensure that the direction provided is applicable to both the MCR and the RSS.

The HSI SG Section 3.7 is not applicable to the technical support center. FSAR Section 18.7.2.4.3 states, "The emergency operations facility and technical support center will comply with the guidance in NUREG-0696, Functional Criteria for Emergency Response Facilities.

The HSIs in the technical support center and emergency operating facility are derivatives of the main control room HSIs and comply with the HSI style guide; however, these HSIs are for information display only. No control functions are provided in any of the emergency response facilities." HSI SG Section 3.7 is intended for operating locations from where monitoring and control of the plant is conducted. The HSI SG has been revised to clarify the scope of Section 3.7.

Response to item 2:

The RSS conforms to the HSI SG requirements which are designed to support human performance under a full range of environmental conditions. The RSS is expected to be used for monitoring only as there are no operator actions required or anticipated to be conducted from the RSS. Normal nuclear and industrial safety standards such as hearing protection, heat stress, contamination and radiation protection will be applicable to operators in the RSS. If the NuScale design is modified such that operator actions from the RSS are expected, then the COL applicant will evaluate those actions during the conduct of the Design Implementation HFE element per NUREG-0711 Section 12.3.

Response to item 3:

Section 3.7 and Appendix G of the HSI SG have been updated to accommodate the changes mentioned above.

Response to item 4:

The emergency response facility designs, including HFE design, are a COL responsibility as identified in FSAR Section 13.3. The HSIs in the technical support center and emergency operating facility are derivatives of the main control room HSIs and comply with the HSI SG.

NuScale Nonproprietary

The NuScale RSS is not required to ensure a safe shutdown following control room evacuation.

Passive design features provide for safe shutdown. The RSS is included in the design to conform to regulation.

Volume III of the HSI SG is intended to contain the HSI Library as discussed in Section 1.6.3.

The library is provided as an example of how the design criteria of Volume ll are applied. This supports maintaining design consistency across time although other configurations could acceptably implement Volume ll criteria if such changes were found necessary. The final bullet in Section 4.5.4 of the HSI RSR incorrectly states that Volume III of the HSI SG will contain work location specific information while it is intended to be contained in Appendix G of the HSI SG.

Section 4.5.4 of the Human System Interface Design Results Summary Resport has been modified to accurately reflect what will be available in Volume III of the HSI SG.

Descriptive language was added to Appendix G of the HSI SG to better delineate the information available within that Appendix.

While the RSS HFE design will conform to the HSI SG Volume ll, the specific configuration is not yet developed. Appendix G of the HSI SG will be updated when the design is complete. In the interim, the following points are made to emphasize the plant design characteristics supporting a limited scope RSS HFE design:

There are multiple display pages that summarize safety status of all 12 modules. A one to one correspondence between the VDU and a module is not needed. An operator can monitor all 12 modules using one display page containing the parameters of interest.

The module control system and plant control system ) are accessible from any operating station. Controls would be accessible on a module basis even from one operating station.

No operator actions are required for a safe shutdown.

No operator actions are required for design basis events if one were to occur in conjunction with a control room evacuation.

Impact on DCA:

The Human-Systems Interface Style Guide and Human-System Interface Design RSR have been revised as described in the response above and as shown in the markup provided in this response.

NuScale Nonproprietary

Human Factors Engineering Human-System Interface Design Results Summary Report RP-0316-17619-NP Draft Rev. 21 4.5.4 Volume III System Human-System Interface Description and Display Page Examples Volume III provides the HSI Library that reflects the implementation of Volume II. The volume will contain chapters comprised of specific information about a system, location, or concept in a NuScale Plant. Volume III will be provided to a combined operating license applicant (COLA) upon request.

Chapter topics include but are not limited to:

system overview and scope

definitions

system specific information

HSI display page information

symbols

icons

objects

workstation construct where applicable

system display page examples

work location specific information (MCR, TSC, RSS, EOF and local control station (LCS))

4.5.5 Appendices Specific NuScale Human-System Interface Design Information The appendices have been created as designer guides that address key HFE and HSI design elements. Their use drives consistency and commonality throughout the project.

Appendix A - Language and Text

Appendix B - Color Usage

Appendix C - User Interfaces

Appendix D - Display Page Design

Appendix E - Plant Notifications

Appendix F - Safety Display and Indication System

Appendix G - HFE Design

Appendix H - Automation and Computer-based Procedures

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 interaction aspects, the information display and user-system interaction aspects of soft control systems as well as guidelines for projectors, printers and hand held devices.

Section 3.9 Automation This section provides HFE guidelines for the use of automation in the operator HSI..

Section 3.10 Plant Maintenance and Work Management This section has been added as a place holder for future efforts.

1.6.3 Volume III Volume III contains the NuScale HSI library. Each section isThis volume will contain chapters comprised of specific information about a system, location, or concept in a NuScale plant. The information that may be presented in each chaptersection is provided below in no specific order.

1. System Description.

2. Example of the display page.

3. Any additional information pertaining to the display page.

1.7 Guideline Format The individual guidelines are presented in the standardized format shown below.

EXAMPLE: 3.1.2.1.10 Data Manipulation The user should be able to manipulate information without concern for internal storage and retrieval mechanisms of the system.

Default values for the information to be entered in a particular task should be offered and displayed in the appropriate data field to speed entry.

Users should be permitted to define, change, or remove default values for any input field.

Each guideline is composed of the following parts:

Guideline Number - Within sections/subsections, individual guidelines are numbered consecutively from 1 to n. Each guideline has a unique number that indicates its section/subsection location. For example, in Guideline 3.1.2.1.10, Data Manipulation, the "3.1" reflects its location in Volume II, General HSI Information, the .2 reflects the location within the chapter, Requirements and Guidelines, the .1 reflects the section in

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7 Workplace Design Workplaces are facilities that house workstations and other task-support equipment and provide the environment in which personnel perform their tasks, e.g., the main control room, remote shutdown station, and local control stations. This section is intended for operating locations from where monitoring and control of the plant is conducted such as the MCR and RSS. This section is not applicable to the Emergency Response Facilities.

3.7.1 Definitions Control Room Two important aspects of a control room are its configuration (i.e., the arrangement of workstations and other equipment within it) and its environment. The important characteristics of each are described below. Many of these characteristics are also applicable to other workplaces, such as the remote shutdown station and technical support center.

Control Room Configuration Control room configuration refers to the overall layout and arrangement of the control room; it comprises the following factors:

Accessibility of instrumentation/equipment Accessibility refers to the ease with which control room personnel can gain access to needed instrumentation and equipment. Any instrumentation and equipment needed by control room personnel for detecting abnormal conditions and shutting down the plant, but which are not located inside the control room, should be identified. Similarly, the controls and displays required for continuous monitoring and the timing of control actions that are not located in the primary operating area of the control room should be identified. Review guidelines are provided in Section 3.7.2.1.

Consistency of staffing with equipment layout This refers to factors that may affect the adequacy of personnel staffing levels, including:

the ability of control room personnel to monitor and operate all necessary controls, displays, and other equipment during all modes of plant operation (e.g., consistency of the control room layout with staffing levels and task assignments); the ability of additional onsite or offsite personnel to augment the normal crew complement under certain unusual conditions, such as refueling (e.g., consistency of control room layout with anticipated activities and task assignments); the ability to limit access and movement of nonessential but authorized personnel to prescribed areas within the control room (e.g., adequate designations of prescribed areas; doors, gates, and other physical barriers). Review guidelines are provided in Section 3.7.2.1.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2 Main Control Room Requirements and Guidelines 3.7.2.1 Control Room Configuration 3.7.2.1.1 Present in the Control Room ES-0304-1381-12737 Guideline: Control room instrumentation and equipment should include all controls and displays needed for (1) detection of abnormal conditions, and (2) bringing the plant to a safe shutdown condition.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.1 3.7.2.1.2 Arranged to Facilitate Coverage ES-0304-1381-12739 Guideline: Users should not have to leave their principal work areas to attend to instrumentation on back panels during operational sequences in which continuous monitoring or the timing of control actions may be critical.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.1 3.7.2.1.3 Coverage ES-0304-1381-12741 Guideline: Control room staffing and task assignments should ensure complete and timely coverage of controls, displays, and other equipment required during all modes of operation.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.2

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.1.4 Utilization of Additional Personnel ES-0304-1381-12743 Guideline: When additional onsite or offsite personnel are needed to augment the normal crew complement under certain conditions (e.g., refueling), activities, and task assignments should be planned to ensure proper coordination.

Additional Information: Special training for this situation may be required.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.2 3.7.2.1.5 Nonessential Personnel ES-0304-1381-12745 Guideline: Provision should be made to limit the access and movement of nonessential but authorized personnel to prescribed areas within the control room.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.2 3.7.2.1.6 Viewing ES-0304-1381-12747 Guideline: Desks and consoles should permit users at those desks and consoles full view of all control and display panels (including alarm displays) in the main control room.

Additional Information: Placement and spacing of equipment depends on control room configuration, staffing, and other design features. Thus, guidelines are stated in terms of minimum spacing considerations for common equipment arrangements and use situations. Maintenance and testing of equipment has not been considered, and may require larger clearances than the minimums suggested.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.3

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.1.7 Communications ES-0304-1381-12749 Guideline: Desk and console placement should facilitate voice communications from users seated at those workstations to any point in the main operating area.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.3 3.7.2.1.8 Access to Workstations ES-0304-1381-12751 Guideline: Users should be able to get to any workstation without having to overcome obstacles such as tripping hazards, poorly positioned filing cabinets or storage racks, and maintenance equipment.

Additional Information: Users should be able to position themselves conveniently for performing task actions at any work station.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.3 3.7.2.1.9 Adjustable Surfaces ES-0304-1381-20365 Guideline: Adjustable workstation surfaces shall

Use a fail-safe mechanism to prevent inadvertent movement

Use a control locking mechanism to prevent inadvertent operation Adjustable surfaces that hold heavy objects, such as a visual display, can present a hazard to users. For example, adjustable surfaces moving relative to each other may create pinch-point hazards, either while in operation or in the event of failure.

Elderly or disabled users may have special requirements with regard to adjustment surfaces. Some considerations for these user groups are:

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32

Accessibility for individuals in wheelchairs HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

ASNI-HFES 100-2007 Section 5.2.1.3 3.7.2.1.10 Pinch Points ES-0304-1381-20367 Guideline: Pinch points, in which fingers, arms, and legs can be caught between movable surfaces or parts, shall

Be avoided by means of design or guarding In adjustable workstation furniture, surfaces move relative to one another. This may lead to pinch point hazards in which fingers, arms, or legs can be caught between moving surfaces or parts. This can occur, for example, when a motorized work surface moves past a fixed surface or when clearance between a seat adjustment lever and the bottom of the seat is inadequate. The size of the clearance gap necessary to avoid pinch points will depend on which limb might be involved, but it can be determined with reference to the appropriate 95th percentile male dimension.

The recommended hierarchy of procedures to avoid pinch points is to

Design to eliminate the hazard

Guard against the hazard

Provide warning labels and instructions to users for safe operation HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

ASNI-HFES 100-2007 Section 5.2.1.4 3.7.2.1.11 Device Cabling ES-0304-1381-20369 Guideline: Cables that connect to devices in the workstation should

Be placed to avoid interference with the operation of workstation components

Be placed to avoid creating hazards for people or equipment in the workstation

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Poorly installed cables can present hazards, cause unintended motion of input devices, and/or limit device usage. The characteristics of cables to consider in the workstation configurations include length, weight, tension, flexibility, and location.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

ASNI-HFES 100-2007 Section 5.2.1.5 3.7.2.1.12 Circulation Patterns ES-0304-1381-12753 Guideline: The control room arrangement should facilitate efficient, unobstructed movement and communication.

Additional Information: The control room arrangement should minimize interference between the members of the operational crew.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.3 3.7.2.1.13 Maneuvering Space ES-0304-1381-12755 Guideline: Adequate space should be allowed between the back (user's position) of a desk or console and any surface or fixed object behind the user for the user to get into and out of a chair freely or to turn in the chair to view the equipment behind.

Additional Information: A minimum separation of 36 inches from the back of any desk to any opposing surface is suggested as the minimum (see Figure 3-31). A greater separation is preferable. Lateral space for a seated user should be no less than 30 inches; greater latitude is preferable. Placement and spacing of equipment depends on control room configuration, staffing, and other design features. Thus, guidelines are stated in terms of minimum spacing considerations for common equipment arrangements and use situations. Maintenance and testing of equipment has not been considered, and may require larger clearances than the minimums suggested.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32

Reference:

NUREG-0700-12.1.1.3 3.7.2.1.14 Equipment-to-Opposing-Surface Distance ES-0304-1381-12757 Guideline: Enough space should be allowed so that personnel can perform all required tasks.

Additional Information: The space should accommodate kneeling and bending, simultaneous work by more than one person, and simultaneous performance of operational and maintenance tasks as required. Recommended minimum separations are illustrated in Figure 3-32. mMinimum separation of 50 inches is recommended between a single row of equipment/panel and a wall or other opposing surface. A minimum separation of 50 inches is also recommended between two rows of facing equipment if both rows are worked by a single person. A minimum separation of 8 feet is recommended between opposing rows of equipment where more than one person must work simultaneously on operational or maintenance tasks, and kneeling, bending, or use of test equipment may be necessary.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.3

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Figure 3-31. Spacing of equipment to accommodate seated users Figure 3-32. Equipment-to-equipment distances 3.7.2.1.15 Openings ES-0304-1381-12763 Guideline: Panels should be laid out and maintained, and equipment enclosures designed, so that there are no unguarded openings through which unwanted objects can be introduced.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.3

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.2 Procedures 3.7.2.2.1 Accessibility ES-0304-1381-12765 Guideline: All procedures and other documents that may be needed for ready reference should be kept in the control room in places where they are easy to locate and extract for use.

Additional Information: Reference documents should not be locked up, or stored in places too low or too high for large or small personnel to access easily, in cramped spaces, or where poor illumination exists.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.4 3.7.2.2.2 Location Aids ES-0304-1381-12767 Guideline: Clearly visible title labels should be provided to identify specific documents.

Labels should distinguish documents as much as possible.

Additional Information: Putting many volumes in one location creates a search problem, especially if titles are similar. One means of reducing search time would be to put operational documentation in one location and other documentation in a secondary location.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.4 3.7.2.2.3 Convenience of Use ES-0304-1381-12769 Guideline: Documents should not be fixed in racks; it should be possible to remove documents for use.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.4 3.7.2.2.4 Bound Documents ES-0304-1381-12771 Guideline: Documents should be bound so that they can be opened fully and will remain open at the desired place without holding.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.4 3.7.2.2.5 Protection ES-0304-1381-12773 Guideline: Documents should be protected from wear so that they do not become dog-eared, dirty, loose, torn, and difficult to read.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.4 3.7.2.2.6 Dedicated Sets of Procedures ES-0304-1381-12775 Guideline: Sets of procedures should be stored separately for each unit in a multiunit control room.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.4

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.3 Parts and Tools 3.7.2.3.1 Supply ES-0304-1381-12777 Guideline: There should be an adequate supply of expendables and spare parts (e.g.,

fuses, indicating lights and printer paper).

Additional Information: Spare parts, such as indicator lamps, and any tools that are needed by operating personnel should be stored in suitable, designated space(s) within the control room.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.5 3.7.2.3.2 Accessibility ES-0304-1381-12779 Guideline: Expendables and spare parts should be readily accessible.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.5 3.7.2.3.3 Tools ES-0304-1381-12781 Guideline: All necessary or special replacement tools should be available as needed to install expendables and spare parts.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.5

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.3.4 Storage Space ES-0304-1381-12783 Guideline: There should be adequate storage space for expendables and spare parts.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.5 3.7.2.3.5 Coding ES-0304-1381-12785 Guideline: When different types, sizes, or styles of expendables and spare parts are required, they should be clearly and distinctively marked to avoid misapplication.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.5 3.7.2.3.6 Inventory ES-0304-1381-12787 Guideline: Records should be kept as to the status of expendables and spare parts.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.5 3.7.2.4 Supervisor Access 3.7.2.4.1 Access ES-0304-1381-12789 Guideline: The shift supervisor's office should be located so as to permit prompt physical access to the control room under all conditions, including control room isolation.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Additional Information: The preferred location is within the control room isolation boundary, with placement to permit good visual and voice contact with the main operating area.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.6 3.7.2.4.2 Communications ES-0304-1381-12791 Guideline: Dedicated communications links should be provided between the main operating area and the shift supervisor's office when the shift supervisor's office is not within the control room boundary.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.6 3.7.2.5 Multiunit Control Rooms 3.7.2.5.1 Equipment Arrangement ES-0304-1381-12793 Guideline: Equipment should be arranged with movement and communication patterns in mind so that unit operations do not interfere with each other.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.7 3.7.2.5.2 Senior Operator Station ES-0304-1381-12795 Guideline: Senior operators who supervise and assist operations of more than one unit should be stationed so that they can communicate effectively with operators in each unit and have an unobstructed visual path to the control boards of each unit.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.7 3.7.2.5.3 Sharing of Personnel ES-0304-1381-12797 Guideline: Where operators may assist those of another unit, potential task loading should be evaluated to assure that each unit can be covered adequately in all situations.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.7 3.7.2.5.4 Sharing of Procedures ES-0304-1381-12799 Guideline: Each unit should have its own set of procedures and other reference documents as required to make sure that references are easily available to personnel in each unit, and to avoid conflicting needs for the same reference.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.7 3.7.2.5.5 Shared Equipment ES-0304-1381-12801 Guideline: When control of some plant equipment is shared by the control rooms of multiple-unit nuclear power plants, care must be taken to ensure that status and availability data for this equipment are available in each control room, and that equipment operation from the control room for one unit will not affect other unit operations.

Additional Information: Control of plant equipment from one control room should not affect the ability of operators of other control rooms to maintain control of their respective units. The status of plant equipment under the control of one control room should be displayed in all control rooms capable of controlling that equipment. If control of plant

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 equipment from one control room renders that equipment unavailable to other control rooms, availability status indications should be displayed in all control rooms. A single, centrally located control panel/console may be used for dual-unit control rooms within the same isolation boundary when this design does not conflict with the panel layout and control-display integration guidelines. Administrative procedures should be in place that assign responsibility for allocation of use of controls of shared plant equipment to a single control room.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.7 3.7.2.5.6 Dedicated Crews ES-0304-1381-12803 Guideline: When mirror image control rooms exist, operational crews should be committed to one or the other unit and should not be allowed to alternate between the two mirrored units.

Additional Information: This includes crews staffing a single center-desk station. Some control rooms are designed with the control boards of two units laid out symmetrically, side-by-side, so that one is a complete or nearly complete reversal of the other.

Operators who work both units have to deal with two opposite patterns of controls and displays, and must reorient their expectations completely when they switch from unit to unit. This requirement violates the principle of positive transfer of training and is highly unfavorable for task performance reliability. The potential for confusion is greater when the reversal is incomplete (e.g., control boards mirror imaged, but annunciator panels arranged identically in both units).

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.7 3.7.2.5.7 Accentuate Differences ES-0304-1381-12805 Guideline: The distinction between the mirrored units should be heightened as much as possible so that there will be no confusion about where one unit ends and the other begins.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Additional Information: In addition to using labeling, distinctiveness can be increased by using a different color scheme for the elements of each unit, including carpeting, desks, and other work station equipment, as well as the board surface areas.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.7 3.7.2.6 Emergency Equipment 3.7.2.6.1 Types of Equipment ES-0304-1381-12807 Guideline: Protective equipment should include protective clothing and breathing apparatus.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.2 Anthropometry ES-0304-1381-12809 Guideline: Protective clothing and breathing equipment should be compatible with users' body sizes and tasks to provide adequate tactile sensitivity and ability to see, reach, move, communicate, and hear.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.3 Periodic Checks ES-0304-1381-12811 Guideline: Protective equipment should be periodically checked to determine if it is in good condition.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.4 Quantity ES-0304-1381-12813 Guideline: There should be protective equipment available in sufficient quantities and sizes for the required number of users.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.5 Marking ES-0304-1381-12815 Guideline: Protective clothing sizes should be clearly identifiable.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.6 Expendables ES-0304-1381-12817 Guideline: There should be an adequate supply of personal protection equipment expendables, such as filters.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.6.7 Accessibility ES-0304-1381-12819 Guideline: All protective equipment should be easily and readily accessible.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.8 Training ES-0304-1381-12821 Guideline: Personnel should be well practiced in donning protective equipment.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.9 Procedures ES-0304-1381-12823 Guideline: Instructions for donning, doffing, and controlling personal protective equipment should be provided.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.10 Periodic Checks ES-0304-1381-12825 Guideline: All equipment should be periodically checked to determine if it is in good condition.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.11 Accessibility ES-0304-1381-12827 Guideline: All equipment should be easily and readily accessible.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.12 Training ES-0304-1381-12829 Guideline: Personnel should be trained in the use of all emergency equipment.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.13 Procedures ES-0304-1381-12831 Guideline: There should be a written, administratively approved procedure for each type of emergency or combination of emergencies.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.14 Automatic Warning System ES-0304-1381-12833 Guideline: There should be an automatic fire warning system for control room fires.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.15 Proper Storage ES-0304-1381-12835 Guideline: Provision should be made for the orderly storage in the control room of emergency equipment that is needed by control room personnel.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.16 Storage Locations ES-0304-1381-12837 Guideline: The storage location(s) may be away from the main operating area but should be accessible, clearly marked, and known to all personnel.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.8 3.7.2.6.17 Automatic Action ES-0304-1381-12929 Guideline: A control room emergency lighting system should be automatically activated and immediately available upon failure of the normal control room lighting system.

Additional Information: This system should be independent of any other plant lighting system that is available in the control room.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.4

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.6.18 Operability ES-0304-1381-12931 Guideline: Failure of the normal control room lighting system should not degrade operability of the emergency lighting system.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.4 3.7.2.6.19 Emergency Lighting Levels ES-0304-1381-12933 Guideline: The control room emergency illumination system should be designed to provide a minimum illumination level of 10 footcandles at all work stations in the main operating area.

Additional Information: Higher levels of illumination are preferred if the room's surfaces are of low reflectivity or the occupants of the room are over 40 years of age.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.4 3.7.2.7 Environmental 3.7.2.7.1 Comfort Zone ES-0304-1381-12867 Guideline: The climate control system should maintain temperatures of 68-75°F in winter and 73-79°F in summer and relative humidity levels between 30% and 60%.

Additional Information: The temperature ranges given are based on the ASHRAE summer and winter comfort zones as specified in ASHRAE 55-1992. In the summer comfort zone, workers wearing light clothing will be comfortable; in the winter comfort zone, workers wearing heavy indoor clothing (e.g., sweaters) will be comfortable. The range of relative humidity given is based on ASHRAE 62 and is narrower than that currently specified in ASHRAE 55. The comfort zones assume sedentary work; personnel performing 'light work' (e.g., actively monitoring spatially distributed

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 equipment, or retrieving procedures or manuals) will be comfortable at lower temperatures. Air movement rates less than 50 ft/min are also assumed.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.1 3.7.2.7.2 Temperature Differential ES-0304-1381-12869 Guideline: Air temperature at floor level and at head level should not differ by more than 10°F.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.1 3.7.2.7.3 Air Quantity ES-0304-1381-12871 Guideline: The ventilation system should be capable of introducing fresh air into the control room at a rate of at least 20 cubic feet per minute per occupant.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.2 3.7.2.7.4 Air Velocity ES-0304-1381-12873 Guideline: Air velocities in the main operating area should not exceed 45 feet per minute measured at head level and should not produce a noticeable draft.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.2

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.7.5 Illumination Levels ES-0304-1381-12875 Guideline: The illumination levels should be consistent with those listed in Table 3-12 Additional Information: The values in the table are preferred levels based on conservative assumptions about the reflectance of the task background, the age of the operator, and the criticality of the task being performed. Lower illuminances may be justified for more favorable visual conditions or where the need to perform critical tasks can be ruled out.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3 Table 3-12. Nominal illumination levels for various tasks and work areas 3.7.2.7.6 Uniformity ES-0304-1381-12895 Guideline: The level of illumination should not vary greatly over a given work station.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3 3.7.2.7.7 Supplemental Light ES-0304-1381-12897 Guideline: Supplemental lighting should be provided for personnel performing specialized visual tasks in areas where fixed illumination is not adequate.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3 3.7.2.7.8 Task Area Luminance Ratios ES-0304-1381-12899 Guideline: To ensure effective visual performance, the task area luminance ratios in Table 3-13 should not be exceeded.

Additional Information: To determine task lighting requirements, it is necessary to consider the levels of lighting that surround a task. Great disparities between task and background lighting can lead to adaptation problems.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Table 3-13. Maximum task area luminance ratios 3.7.2.7.9 Shadows ES-0304-1381-12910 Guideline: To reduce fatigue and eyestrain, shadows should be avoided.

Additional Information: Ambient illumination should be provided via indirect or diffuse lighting. Labels, instructions, and other written information should not be in shadowed positions.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3 3.7.2.7.10 Glare ES-0304-1381-12912 Guideline: Glare should not interfere with the readability of displays, labels, or indicators.

Additional Information: Glare increases the probability that an individual will misread a display or will fail to notice displayed information. Glare can also produce discomfort.

Direct sources of glare include light emitted from luminaires, indicators, and displays.

Indirect sources of glare include reflected light from all surfaces, e.g., paint, metal, and glass. The surface of a VDU screen should reduce reflections. Positioning of VDUs relative to light source affects glare as can use of a shield or filter on the VDU or light source. If glare reduction or contrast enhancement techniques are used, they should not violate the requirements of luminance, contrast, and resolution as stated in this document.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3 3.7.2.7.11 Reflectance ES-0304-1381-12914 Guideline: Reflectance should conform to the recommendations shown in Table 3-14.

Additional Information: The amount of light reflected from a surface depends on its color; typical reflectance values for various colors are given in Table 3-15. Surfaces adjacent to a VDU should have a dull matte finish to reduce glare. The luminance range of surfaces immediately adjacent to VDUs should be between 10 percent and 100 percent of screen background luminance.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3 3.7.2.7.12 Color ES-0304-1381-12916 Guideline: Surface colors should be recognizable under both normal and emergency lighting conditions.

Additional Information: Some types of lamps (e.g., mercury or sodium lamps) have very poor color rendering properties. Such lamps should not be used for normal or emergency lighting if the ability to distinguish among colors may be important.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.7.13 Ambient Illumination and VDUs ES-0304-1381-12918 Guideline: The ambient illumination in the VDU area that is necessary for other visual functions (e.g., setting controls, reading instruments) should not degrade the visibility of signals on the VDU.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3 Table 3-14. Recommended workplace reflectance levels 3.7.2.7.14 Use of Colored Ambient Illumination ES-0304-1381-12923 Guideline: Colored ambient illumination should not be used if color coding is used in the workplace.

Additional Information: Colored lighting will interfere with color-coded VDU displays and other color coding. Some types of lamps (e.g., mercury or sodium lamps) have very poor color rendering properties. Such lamps should not be used for normal or emergency lighting if the ability to distinguish among colors may be important.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.7.15 Illuminance of Areas Immediately Surrounding VDUs ES-0304-1381-12925 Guideline: There should be no light source (direct or reflected) in the immediate surrounding area of the VDU that is of greater luminance than the VDU.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.3

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Table 3-15. Surface color reflectance values 3.7.2.7.16 Storage Locations ES-0304-1381-12839 Guideline: There should be a suitable, out-of-the-way, but secure place in which control room personnel may keep their coats and other personal belongings.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.9

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.7.17 Storage Suitability ES-0304-1381-12841 Guideline: If lockers are provided, they should be large enough to hold the items that might reasonably be expected to require storage.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.9 3.7.2.7.18 Decor ES-0304-1381-12843 Guideline: Decor should create a pleasant working environment in the control room.

Additional Information: Features to be considered include:

Color coordination

Use of color and lighting to create a cheerful atmosphere (without introducing glare and brightness to a degree that causes eye fatigue or an overly intense atmosphere)

Visual relief from arrays of instrumentation

Comfortable seating

Carpeting to lessen the fatigue of standing and walking.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.10 3.7.2.7.19 Restroom and Eating Facilities ES-0304-1381-12845 Guideline: A restroom and kitchen or eating area should be provided within (preferably) or near the control room isolation boundary.

Additional Information: Since formal breaks are not scheduled in most control rooms, it is important that personnel have access to these facilities without delay. It is preferable that they be used only by control room personnel. Provision should be made for

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 communication if facilities are out of voice contact, so that an operator taking a break can be contacted as necessary by personnel in the control room.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.10 3.7.2.7.20 Rest Area/Lounge ES-0304-1381-12847 Guideline: Consideration should be given to providing a rest area (possibly in conjunction with the eating area) conducive to relaxation and revitalization, especially where shifts are long.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.10 3.7.2.8 Shared Information 3.7.2.8.1 Shared Information and Control Functions ES-0304-1381-12849 Guideline: The HSI design should maximize the ability of users to share information and control functions among crew members if users are required to share the responsibilities for monitoring and control.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.11 3.7.2.8.2 Indication of Shared Control Capability ES-0304-1381-12851 Guideline: If a control function is shared among users but only one user can operate it at a time, then a clear, unambiguous indication should be provided identifying which user has the control capability.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.11 3.7.2.8.3 Indication of Override of Shared Control Capability ES-0304-1381-12853 Guideline: A clear, unambiguous indication should be provided prior to overriding the use of a shared control.

Additional Information: An override capability allows one user to take the control capability of a shared control from another user. If such an override capability exists, then a clear indication should be provided prior to each override so that users are aware of the pending change.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.11 3.7.2.8.4 Shared Display Devices ES-0304-1381-12855 Guideline: When a display device is viewed by more than one person, its use should be regulated.

Additional Information: The system should not permit one user to remove a display that is still needed by another user, or to present a display that may interfere with another user's activities.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.11 3.7.2.8.5 User-Configured Displays ES-0304-1381-12857 Guideline: When a display device can be configured by more than one user, the system should support the coordinated use of the displays.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Additional Information: Users may modify display pages to address particular task needs or personal preferences. For example, a user may be able to select plant variables to be included in or excluded from the display page, define coding for displayed items, and define axes and scales for plots. When multiple users can manipulate the same displays, coordination may be needed to ensure that they are aware of the current content. In addition, mechanisms are needed to ensure that displays created by one user are not changed or eliminated by other users. Possible solutions include password protection, special directories for storing these displays, and administrative procedures.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.11 3.7.2.8.6 Soft Controls with Multiple Access ES-0304-1381-12859 Guideline: The system should make each user aware of control inputs made by others, and ensure that the control actions of one user are not unknowingly reversing another user's actions.

Additional Information: Some input interfaces for controlling plant variables can be accessed from multiple locations in the HSI. Some process plants with computer-based HSIs address this problem by assigning control capabilities for a plant variable to a particular control console. Users at other consoles can observe the control setting but cannot initiate changes.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.11 3.7.2.8.7 Consistent System Response ES-0304-1381-12861 Guideline: The system's interpretation of a user input should not change as a result of an upgrade.

Additional Information: For example, a given keystroke should not produce a benign action in one version of the system software and a destructive action, such as erasing data, in a subsequent version.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.12 3.7.2.8.8 Existing Skills Preserved ES-0304-1381-12863 Guideline: Changes to HSI hardware or software should not force users to have to unlearn existing skills.

Additional Information: It is better for an upgrade to require the user to learn additional skills rather than expect the user to change existing ones. Thus, changes in the information presented by the system (e.g., messages, graphic symbols) are less difficult to adapt to if they do not require users to modify their skills or strategies. For example, changes limited to physical appearance do not typically seriously disrupt users' performance, whereas changes in the operation of the system almost certainly will.

However, sometimes the appearance of a system is strongly linked to user skills. For example, the layout of tools on the palette of a drawing program should not be changed in subsequent versions. Users who rely on spatial memory for retrieving tools from the palette will find that this skill leads them to select the wrong tool.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.1.12 3.7.2.8.9 Salient Changes ES-0304-1381-12865 Guideline: If changes must be made to the HSI, they should be salient.

Additional Information: Drawing the user's attention to characteristics that have changed can help them to adapt their skills. For example, injecting a single new word into a message is not recommended. Adding the word 'not' to a question, such as "Do you want to save these settings?" will change the meaning of the message. However, it may not be detected by the user until an error occurs. Many actions become automatic as users become skilled in using the interface. If HSI changes are obvious, users may be able to block their automatic responses and develop new ones.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32

Reference:

NUREG-0700-12.1.1.12 3.7.2.9 Acoustics 3.7.2.9.1 Overall Design ES-0304-1381-12935 Guideline: The acoustic design of the control room should ensure that verbal communications among personnel are not impaired; auditory signals are readily detected; and auditory distraction, irritation, and fatigue are minimized.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.5 3.7.2.9.2 Background Noise ES-0304-1381-12937 Guideline: Background noise should not impair verbal communication between any two points in the main operating area.

Additional Information: Verbal communications should be intelligible using normal or slightly raised voice levels. Figure 3-33 shows the voice levels needed for spoken communication over specified distances in the presence of different levels of background noise. Intelligibility of speech in noise is affected by the frequency spectra of the noise and of the speakers' voices and by the speakers' hearing sensitivity.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.5

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Figure 3-33. Voice level as a function of distance and ambient noise level 3.7.2.9.3 Background Noise Level ES-0304-1381-12941 Guideline: Background noise levels should not exceed 65 dB(A).

Additional Information: Operators eight feet apart will have to speak loudly to be heard in the presence of a 65 dB(A) background noise. Therefore, if workstations, display panels, or control interfaces are widely separated in the control room, the background noise limit should be reduced.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.5 3.7.2.9.4 Further Reductions ES-0304-1381-12943 Guideline: Where communications between the main operating area and other control room locations are necessary, and voice transmission systems are not provided, further reductions in background noise should be implemented.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.5

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 3.7.2.9.5 Noise Distractions ES-0304-1381-12945 Guideline: Noise distractions generated either inside or outside the control room should be minimized.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.5 3.7.2.9.6 Reverberation Time and Sound Absorption ES-0304-1381-12947 Guideline: The acoustical treatment of the control room should limit reverberation time to 1 second or less.

HSI Design Criteria NuScale control roomMCR configuration guidance will incorporate this design standard.

Reference:

NUREG-0700-12.1.2.5 3.7.3 Local Control Stations Requirements and Guidelines 3.7.3.1 Labeling of Equipment ES-0304-1381-12949 Guideline: Labels should appear on all components and systems with which personnel may interact.

HSI Design Criteria NuScale LCS labeling guidance will incorporate this design standard.

Reference:

NUREG-0700-12.2.1.1 3.7.3.1.1 Replacement of Labels ES-0304-1381-12951 Guideline: When labels are affixed, earlier markings (such as labels applied during construction or acceptance, or informal labels) should be removed.

Human-System Interface Style Guide ES-0304-1381-NP Draft Rev. 32 Appendix G. HFE Design When performing workplace or workstation design for control rooms or LCSs in a NuScale plant, the NuScale HFE design team should follow the guidance provided in Section 3.6 and 3.7 and provide any appropriate design considerations/decisions below.

This Appendix is meant to capture applicable HFE design considerations for NuScale designed location and is not meant to replace any system or detailed design documents needed by the owners of those locations.

Vendor provided LCSs and control room locations using the requirements and guidelines found in this document will be included below.In addition to the guidance provided in Section 3.6 and 3.7 of this style guide, the NuScale HSI developers should follow the additional guidance listed below.

G.1 Workstation Configuration HSI elements are organized into workstations, where the operators perform their functions and tasks. Types of workstations include sit-stand workstations, stand-up consoles, sit-down consoles, vertical panels, and desks (e.g., used by personnel when performing tasks related to the operation and safety of the plant in the main control room). The operators' performance may be affected by design characteristics that affect reach, vision, and comfort. Unique considerations for these types of workstations include the following:

workstation height (i.e., for workstations that the operator must see over)

benchboard slope, angle, and depth for consoles and sit-stand workstations (i.e.,

accommodations for reach; provision of writing space)

control device location (i.e., placement of highest and lowest controls; distance from front edge of workstation)

display device location (i.e., placement of highest and lowest display devices, orientation relative to line of sight, viewing distance, position of frequently and infrequently monitored display devices)

lateral spread of control and display devices at a console or workstation

clearances for legs and feet In addition, the workstation design includes the seating provided for personnel at the consoles or desks. Important considerations include mobility; rests for back, arms, and feet; seat adjustability, and cushioning. Review guidelines for workstation configuration are provided as follows: stand-up consoles in Section 3.6.2.1, sit-down consoles in Section 3.6.2.2, sit-stand workstations in Section 3.6.2.3, vertical panels in Section 3.6.2.4, desks in Section 3.6.2.5, and chairs in Section 3.6.2.6.

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