ML18081B162

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Forwards Control Room Design Review Based on Human Factors Methods.Areas of Possible Human Engineering Improvements Include Functional Demarcation of Related Elements,Labeling, Control Functions & Meters
ML18081B162
Person / Time
Site: Salem PSEG icon.png
Issue date: 03/06/1980
From: Mittl R
Public Service Enterprise Group
To: Parr O
Office of Nuclear Reactor Regulation
References
NUDOCS 8003070381
Download: ML18081B162 (17)
v • d • e


Text

PS~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /430-7000 March 6,.l980 Director of Nuclear Reactor Regulation

u. S., Nuclear Regulatory Commission Washington, D. C..

20555 Attention:

Gentlemen:

Mr., Olan D., Parr, Chief Light Water Reactors Branch 3 Division of Project Managerrierit CONTROL ROOM DESIGN REVIEW NO.. 2 UNIT SALEM NUCLEAR GENERATING STATION DOCKET NO. 50-311 Public Service Electric & Gas hereby submits its review of the Salem 2 Control Room design with regard to human factors methods..

It should be noted that the Salem 2 Control Room design provides for safe and efficient operation of the unit during normal and emergency conditions., *The review that has been undertaken, however, has revealed some areas which will be further evaluated for potential improvements from the human factors.standpoint.

  • These areas are des'cribed in the enclosure to this letter.

Should you have any questions, please do not_hesita-te--Eo----------

con_ta_c_t_us-.

Enclosure r~

1879 1979 Very truly yours, pf/~

R. :L. Mittl * ~

General Manager -

Licensing and Environment Engineeiing and Construction 95-2001 (300M) 1-79

SALEM NUCLEAR GENERATING STATION NO. 2 UNIT CONTROL ROOM REVIEW

, The design of the Salem Control Room by the Public Service

~ Engineering Department was started in 1969.

An in-house design was selected in order to incorporate features which Public Service had developed in the design of control rooms for fossil units.

The vendor design consisted of large up-right control boards, with large operating mechanisms and indicators.

This type of design ran counter to the concept we had developed in the late fifties.

Our basic control console concept was based on studies of so-called "cockpit design" where all vital controls are within easy reach of the pilot.

Miniaturization of controls was a necessary ingredient to enable us to meet the basic concept while at the same time re-ducing voltage levels on the board.

Feedback over the years from our operating personnel and advancement in the state of the art have enabled us to continually improve our design of control consoles.

The control console is basically horseshoe shaped containing miniaturized control elements such as pushbuttons and indica-tors.

A full-size model was built in order to evaluate the design and arrangement of the control room equipment by En-gineering and Operating personnel.

Control Room plan view drawings, control board dimensional and

  • arrangement drawings, and drawings showing typical control bezel arrangements are attached for reference.

These drawings also show that the arrangement for No. l and No. 2 units are "same hand" design and not "mirror image."

The control room provides the necessary controls and indica-tion to start, operate and shut down the unit with sufficient redundant information displays and alarm indications to ensure safe and reliable operation under normal and abnormal conditions.

The most important unit controls are located on the contr:_Ql~~~~~~~~~

console, which is a free-standing, horseshoe-shaped design The front horizontal portion contains the most frequently used operating controls, while the rear vertical portion contains less frequently used controls and indication.

Controls and M P80 26 03/1

indlcators are functionally grouped on a system basis to facilitate safe, reliable operation of the unit during transi-ents as well as normal operation.

Those systems requiring more frequent operator attention are located in the central area, while less frequently used controls are located on either side.

Essentially, the console instruments consist of plug-in, back-lighted pushbutton stations and vertical scale indicators.

Operator action consists of a momentary push of a button.

The lights in the buttons are used for status information and alarm indication.

Alarms are provided in the control room to alert the operator of abnormal plant conditions.

The alarm displays are located either on a console pushbutton control station, where correc-tive action would be taken, or on the overhead annunciator.

An alarm signal causes a back-lighted pushbutton to flash and the console audible alarm to sound until acknowledged by the operator.

Upon clearing of an alarm condition, the console audible ringback is sounded.

Other alarms are displayed on annunciator panels located overhead above the console.

These panels consist of illuminated windows and separate audible alarm and ringback tones.

One of the panels is a first-out annunciator panel which indicates, by means of red and white lights, the first trip signals to occur.

A comprehensive status panel, employing the same type of il-luminated windows as the console, indicates the condition of trip channels and alarms.

By means of a "mimic bus" arrange-ment, the interaction of trip conditions and permissives can be quickly analyzed.

Diesel generator automatic load se-quencing, critical valve status, and other important informa-tion are also clearly displayed.

A computer is employed to assist the operator and to monitor the unit.

Selected parameter trends can be recorded while

a-1-arm-coffd-i-t-i-ons-a-re-tn-d-1ccrt:ea-to--t:ne opera tor.

Tile co_m_p_u~t~e_r ________ _

output consists of a video display mounted on the console and logging typewriters located at the computer output terminal on the other side of the room. Two computer recorders are provided for special purposes.

Vertical panels form the walls of the control room and con-tain controls for systems which require only occasional oper-ator attention as well as miscellaneous recorders and indicators.

Reliability and ease of service have been designed into the control room.

The majority of the console instruments are plug-in modules.

In the unlikely case that a pushbutton sta-tion or indicator on the console malfunctions, it can be M P80 26 03/2

readily removed and replaced from the front of the console during operation.

No access to the inside of the console is needed.

Relamping can also be quickly accomplished from the front of the pushbutton.

All console pushbutton stationi, the fire protection display panel, the overhead annunciator and 'the status panel contain two lamps at each point for in-creased reliability and the ability to detect a burned-out bulb.

A review of the Salem Nuclear Generating Station, No. 2 Unit,

-Control Room was conducted with regard to Human Factors Methods.

The basis of the review was the guideline used in EPRI Report No. NP1118, Volume No. 1, Final Report November, 1979 entitled, "Human Factors Methods for Nuclear Control Room Design:

Volume 1, Human Factors Enhancement of Existing Nuclear Control Rooms."

The review of the control room design for human factors centered on the following:

. Functional Demarcation of Related Elements

. Labeling of Control Devices

. Control Functions

. Meters

. Indicating Lights

. Recorders

. Communications

. Lighting

. Noise

  • Arrangement The above factors were considered from a hardware perspective and included comments from the operating staff.

P80 26 03/3

Results of Control Room Review A.

The present control room design provides for* safe and efficient operation of the unit during normal and emergency conditions.

However, the review revealed some areas which will be evaluated further for possible human engineering improvements.

These are described below.

1.

Functional Demarcation of Related Elements The majority of control console functional control groups are adequately separated and identified.

Minor changes to improve the overall control presen-tation could include the following:

Provide identification tag for power system mimic

. Relocate two indicators for the main steam stop by-pass valves

. Relocate recorders used for steam generator wide-range levels and reactor coolant temperature

. Standardize colors used for instrument cases on the side panels

  • Add an alpha-numeric graphic matrix to the core display panel
2.

Labeling Changes in equipment labeling as described below should be evaluated.

. Replace temporary labeling with permanent lamacoid tags

. Provide informational tags to indicate Technical Sp-eci-f i-cafion --1Trni ts ---

. Standardize letter sizing and tagging practices

3.

Control Functions Potential changes to be considered include the fol-lowing items.

  • Provide more definitive identification of push-buttons used for "indication" only

. Provide accentuation of control switch pointers on the radiation monitoring system and rod selector switches M PBO 26 03/4

  • Provide indication of side-panel control switches' functions (e.g. momentary selection, maintained selection, etc.)
  • Relocate vibration monitors and conductivity re-corder to facilitate operation and/or observa-tion
  • Provide protection for the rod bottom selector switches to prevent inadvertent operation.

(This has already been done on No. 1 Unit)

  • Delete part length rod control system indicators
4.

Meters Potential changes in meters are as follows:

  • Standardize scale divisions
  • Provide "alarm" and "trip" limit information
5.

Indicating Lights Potential changes are described below *

  • Determine feasibility of additional lamp testing provisions
  • Evaluate use of different lamp types on protective relay status panel
6.

Recorders Computer recorders are presently being used for circulating water temperature and reactor coolant saturation temperatures.

The installation of dedicated recorders for these functions should be studied.

7.

Annunciators The use of additional labels to indicate alarm set-points should be evaluated.

B.

Areas of the review determined to be adequate from a human engineering standpoint, and not considered for further study include:

  • Communications
  • Lighting
  • Noise
  • Arrangement M P80 26 03/5 1/5

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