ML20246G076
| ML20246G076 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 04/28/1989 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8905150181 | |
| Download: ML20246G076 (8) | |
Text
.
r DUKE POWER GOMPAhT P.O. BOX 33180 l
CHARLOTTE, N.C. 28242 HALB.TUCKEH retzrnown varim enesseen?
(704) 373-4531
,rt10 LEAR PSODUCTAUN 1'
April'28, 1989 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555
Subject:
Duke Powcr Company McGuire. Nuclear Station Docket Nos. 50-369, 370 Gentlemen:
In a letter dated November 2, 1988 the NRC staff indicated that deviations to several Human Engineering Discrepancies (HED) we proposed did not have sufficient technical-justification. Those deviations were described in my April 5, 1988 l
letter.
This' matter, as well as the primary HED associated with the McGuire HVAC Control Panel, was discussed with NRC' staff personnel during a meeting held at the l
McGuire site on-January 18, 1989. During the meeting, we committed to providing an updated and more comprehensive justification for deviating from the primary HEDs associated with the ESF' monitor _ light panel, rearranging the annunciators in
' the McGuire control-' room, and' total rearrangement of the HVAC control panel. The first and second.of the above HED deviations were addressed in my letters dated February 17, 1989 and March 17, 1989 respectively. 'The technical justification for the last of the HEDs (for the HVAC control panel) is hereby attached for NRC review.
Should you have any questions regarding this matter, contact J.S. Warren at (704) 373-6233.
Very truly yours, N
}g, Hal B. Tucker JSW354/lcs xc: Mr. S. D. Ebneter-Mr. Darl Hood j
Regional Administrator, Region II U. S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation l
101 Marietta Street, NW, Suite 2900 Washington, D.C.
20555 Atlanta, Georgia 30323 Mr. P. K. VanDoorn NRC Resident Inspector
[h McGuire Nuclear Station g
8905150181 890428 PDR ADOCK 05000369 P
Docusest'Contral-D2sk
,y_
. April.28 :1989
/
ATTACIDENT h
1, r
McGuire Nuclear Station HVAC Control Panel HED's
'1 Submittal
Introduction:
The McGuire Detailed Control Room Design Review (DCRDR) identified thirteen ('3) 1 d
HED's which involved the HVAC Control Panel. Similar to the resolution of HED's involving Control Room annunciators, a " clean slate" approach was utilized when
'the solutions'for the thirteen HED's were developed. This approach went far and above resolving the discrepancies identified in the HED's and created significant installation. problems. In previous correspondence to NRC dated March 2, 1987'and November 20, 1987 (attached), Duke provided information concerning the undesirability of totally modifying the HVAC Control Panel, and subsequently cancelled the modification package involving this total rearrangement.
.In the meeting with NRC on January 18, 1989 to review remaining HED's for McGuire, the HVAC Control Panel was discussed and reviewed in the plant.
In j
that meeting, the following actions were agreed upon to provide a final j
resolution.
1)
A detailed review of each of the thirteen HED's would be conducted to determine if individual HED resolutions could be accomplished and were 1
justified.
2)
A review of LER's written in the past five years would'be conducted to l
'.}
determine if any involved or resulted from HVAC Control Panel L
operation.
3)
A survey of operational personnel would be conducted to determine if significant operating concerns existed and to solicit practical suggestions for enhancing the panel.
4)
A review of the panel would be conducted to determine if surface enhancements such as labeling, demarcation, and lighting would be beneficial.
1 5)
A schedule would be developed for final resolution of all remaining items.
t l
l
]
l
' l.. p
,HED Review:
l :-
A' detailed review of each of the thirteen HED's involving the HVAC Control Panel:
Lwas conducted. 'A descrip*n and evaluation of each HED is presented below.
l:
HED M-1-004B This HED identified discrepancies with nomenclature and abbreviations on.
- s. annunciators and status lights on the HVAC Control Panel. These discrepancies
~
have beenl corrected.
Recommendation: Resolution to this HED has been completed.
HED M-1-0188 This HED stated that the MAGNEHELIC round face flow meters were difficult to read. The original solution recommendation involved: changing these meters to a rectangular type, such as the Westinghouse VX-252, which is utilized almost exclusively in the.' Control Room.- In addition, square root meters were to be
. changed to linear meters.
A review of each MAGNEHELIC meter showed that the meters adequately display flow and'are not difficult to read. While it is true that flow readings less than 25% of full scale flow are more difficult to ascertain due to this compressed portion of the square root scale, they are readable.
In addition, normal system flowrates' register from mid-to-full scale and are therefore not in this region.
The fact that the meters are round and not rectangular presents no valid operational or hunan factors concerns.
(A sketch of typical MAGNEHELIC meter is shown below.)
f So iiil i il go do ao CFM V I oO l o TAdr o
Recommendation:
No action is required. The meters are acceptable.
HED M-1-0520 This HED stated that the h'VAC Control Panel is too crowded and cluttered.
The
-origins 1 solution recommendation involved total modification of the panel.
A review of the panel was conducted and the following conclusions drawn:
The panel is' full but not necessarily overcrowded.
In contrast to other McGuire control panels, controls and indications on the HVAC Control Panel utilize most available space.
The panel is organized reasonably well (but not absolutely) by unit, HVAC system, and train. This arrangement is intuitive even to an inexperienced person.
Use of the panel is usually non-critical. For this reason, a mistake resulting from less than optimum arrangement would produce less significant consequences.
Recommendation: No action to be taken.
HED M-1-0134, M-1-0135, M-1-0136, M-1-0143, M-1-0144, M-1-0145 These six HED?s deal with the arrangement differences of one' switch and one indicating light on each train of the Containment Purge (VP) System and one
. indicating light on each train of the Incore Instrument Room Purge (VT) System.
Essentially, these three switches are not. similarly arranged together. Between the A train and the B train portions of the panel. The following diagrams detail the difference:
hwm8A]
It mar s)
W 4M 6 }
{Ltdrwr c l
(
1 kl l
{
L a
t j
b57* A }
luse eI A TitAtr@
D TR.Albl*.
Upon review of these discrepancies it was determined tha consistent rearrangement was not present. The consistent location, particularly of the control switch, of these devices is desirable.
Resolution: The switches and lights will be rearranged for consistency between trains.
j l
l/
'HED M-1-0146 This HED identified an indicating light-and selector switch on.the Containment j
Air Return and Hydrogen Skimmer (VX) System that were not functionally grouped.
j A review of the plant components related to these control panel components revealed no correlation in function; therefore, they do not need to be 1
functionally grouped.
i l
Resolution: No action to be taken.
HED M-1-0148
.This HED identified a manual loader control associated wii.h the Annulus
, Ventilation (VE) System which was located outside of the demarcated area of VE controls. This control is utilized as a backup method for hydrogen removal from containment in the unlikely event the Containment Air Return and Hydrogen Skimmer (VX) System does not fully function. Additionally, the control is tested periodically. The control is labeled and set apart from other surrounding controls. To further identify this control ar part of the VE-system, demarcation lines will " box" the control element and a VE system tag will be placed underneath to identify the component as part of the VE system.
Resolution: Demarcation lines and a system tag will be added to enhance identification of this component.
HED M-1-0263 This HED-identified two indication lights associated with a control switch that were located below and to the left of the control switch.
(Normal convention is to provide indication lights directly above the associated control switch.) The components in question are associated with the Incore Instrumentation Room Ventilation (VT) System. The current orientation of the switch and lights is shown:
A rrcH M STAF-T
- STOP ]
{ L WWT C }
( LIGHT B, )
~ ow '
c>w}
~
L oFF i
oFF J
t
Due to the unavailability of iditional space, no rearrangement can be made
.which would significantly improve the discrepancy. Relocating the control switch diagonally down would still place indication in a less than optimum location; however, demarcation lines around these components will better assist
.the' operator with component location and association.
Resolution:
Black demarcation lines will be added around these three components as a group to better associate the indication-lights with the control switch.
-HED M-1-0310 This HED involves sixteen keyed test switches and the apparent ambiguity with switch position and associated indicating lights. These switches are utilized during periodic testing of various systems.
Indicating lights associated with the. test position of the switch are located immediately above the switch. An example of this arrangement is shown below:
%) d e T G. LN C>nc.ArteJat LtdrHT cortLisfcNt>t%
To Td M E> Po' iTieed I
OFF WrnT4 n @ d T5 4 t te,W t.o e4 t% fo+ '* *
- To Tfag,y 4 fo,in W 4
e 4
n m
0 F
r 0
c J
Upon review of this discrepancy it was concluded that no deficiency exists. The indicating lights reasonably relate to the test switch position selected; furthermore, these switches are only utilized by the Test Group and they are fully aware of the function and operation.
Resolution: No action will be taken.
l i
i
HED M-1-0319 This HED identified various multi position switches on the Main Control Board as well as six (6) on the HVAC Control Panel in which control positions were not easily distinguishable. Four of the six HVAC components involve control switches for the Upper Containment Ventilation (VU) system fans. These are two l
speed fans and the controls are labeled as follows:
MM coal g
i Additionally, above cach switch is an indicating on-off light which presents status of the fan unit. A review of the current configuration finds no deficiency; therefore, no changes will be made. The remaining two switches are similar to the test switches described in HED M-0310. The escutcheon plates are clearly marked and indicate two " test" and one "off" positions. A review of this configuration finds no deficiency.
Resolution: No action will be taken.
LER Review:
A search was performed of all past LER's and no events were found which involved or resulted from the HVAC Control Panel.
Operational Personnel Survey:
A written survey was conducted for all Operations shift personnel requesting comments and suggestions pertaining to improvement of the HVAC Control Panel.
Consideration of use during normal and emergency operation was requested and achievable changes such as demarcation, labeling or other enhancements reviewed.
(Large scale rearrangement and panel changes could not be considered due to previously identified concerns). No comments were received from operators surveyed.
7 Surface Enhancement Review:
An additional review of the panel was conducted to determine if earface enhancements could be applied to improve the panel.
The HVAC Control Panel is organized on a logical basis with the following layout features:
+
The panel is divided by unit with the shared Control Room Ventilation (VC) System in the center.
+
Individual ventilation systems are demarcated such that the majority of controls are located within the demarcation lines.
+
The panel is train separated with A train components located on the l
bottom half and B train components located in the top half of the panel.
+
Flow indications are consistently located at the top of the panel.
+
All annunciators are located at the very top of the panel which is consistent with Control Room design philosophy.
+
All status lights are clearly demarcated.
Demarcation of systery units and trains is acceptable and cannot be substantially improved.
A review of individual system enhancements was made to determine if certain changes could be made for each system.
In general, the completed upgrade of component tags has provided the greatest benefit. Due to the number of components and limited space, additional demarcation, color coding or labeling would create more congestion and detract from panel usability.
Currently, good component tags serve the operator best by providing identifiestion of the desired component. No additional enhancements could be devised.
Lighting of the panel was reviewed and is adequate.
Schedule Items requiring resolution as specified in the HED review portion of this submittal will be completed by the end of the Unit 1 EOC6 refueling outage.
This outage is currently scheduled for Spring of 1990.