ML20210F916
| ML20210F916 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 09/19/1986 |
| From: | Fiedler P GENERAL PUBLIC UTILITIES CORP. |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8609250301 | |
| Download: ML20210F916 (10) | |
Text
4 GPU Nuclear NggIg{
100 Interpace Parkway Parsippany, New Jersey 07054 201 263-6500 TELEX 136-482 Writer's Direct Dial Number:
September 19, 1986 Mr. John A. Zwolinski, Director BWR Project Directorate #1 Division of BWR Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Zwolinski:
Subject:
Oyster Creek Nuclear Generating Station Do::ket No. 50-219 Detailed Control Room Design Review (DCRDR)
In response to our conversation with your staff on July 22, 1986, please find attached the supplemental information requested relative to Attachment 2 of GPU Nuclear's May 19, 1986 submittal. With respect to " Control Room Inventory" and as indicated in our previous submittal, GPU Nuclear will compare the control room with the display and control requirements through Revision 4 of the BWR Owner's Group Emergency Procedure Guidelines (this includes Revision 3) to identify any additional instrumentation and control requirements.
trul g, P
edler V
President and Director y er Creek PBF/JDL/pa(3747f) cc:
Dr. Thomas E. Murley, Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA.
19406 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, N.J.
08731 J. Donohew
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U.S. Nuclear Regulatory Commission t
7920 Norfolk Avenue I
Bethesda, Maryland 20014 8609250301 860919 PDR ADOCK 05000219 P
PDR af the General Public Utihties System
ATTACHMENT SELECTION OF DESIGN IMPROVEMENTS This document contains supplemental information relative to GPU Nuclear's May 19, 1986 submittal.
The information is provided in response to our conversation with the staff on July 22, 1986.
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Pige 1 (f 8 ITEM No.
DEFICIENCY DESCRIPTION OF RESOLUTION CORRECTIVE ACTION 1-1 Yarway and reactor protection level instruments Evaluate removing density Removal of compensation from level instru-are not density compensated causing unnecessary compensation from control level ments will be implemented in 13R because alarms if density-compensated recorder is used instruments.
engineering justification from GE is not for control, available and, therefore, implementation cannot be scheduled until then. This delay was evaluated as acceptable because compensated levels will be available on the plant computer. CRTs for the plant computer will be installed,in llR and displays develcped in Cycle 11.
1-2 Core region level instruments are not used.
Evaluate making core region Instrument was upgraded and tested to instruments operational when improve operator confidence. Since reading pumps are running.
is misleading with pumps on, evaluation de'. ermined instrument should be off when pumps are on.
1-3 Need temperature indications for elevations in Upgrade temperature' instrumentation.
This item is complete. Primary readout drywell, torus and H&V system.
for drywell and torus temperature used in the EOPS are available on a recorder with a digital readout on a control room front panel. These temperatures plus additional temperatures will also be available on the computer.
1-4 Syn hroscope operates counter to industry Evaluate making synchroscope rotate Technical and Human Factors evaluations
- standard, in standard direction.
determined modification is not necessary.
1-5 The added facades may aggravate the problem of Measure temperatures if facades are Temperature survey shows no modification high temperature in the spaces behind panels.
installed. Correct as necessary.
is necessary.
1-6 Tne differential pressure instrument currently Evaluate use of present do meter to The differential pressure instrument provided for the containment spray systen display needed information.
currently provided for the containment measures the difference between shellside and spray system is used during normal opera-tubeside pressure and has no functional use.
tion and cannot be used for another The emergency procedure calls for a shellside purpose. The reading required by the differential reading, which is only provided emergency procedure measures the dp locally.
across the service water baffle plate and is based on preventing degradation over long-term operation due to baffle plate defonnation. Since sudden failure is not expected, periodic readings of the local dp indication are satisfactory. Furthermore, emergency procedure does not require immediate octrator action. If the local indicator becomes unaccessible, performance of the heat exchanger can be assessed by control room indication of heat exheanger inlet and outlet temperature.
- 1-7 Displays associated with Rod Worth Minimizer are Consider relocating the electronics.
Rod Worth Minimizer and front controls will distracting to operator. Rod Worth Minimizer (Note that a few of the indicator be resolved during 12R.
displays and controls are not needed on front lights are used and would remain.)
panel.
Page 2 Cf 8 ITEM No.
DEFICIENCY DESCRIPTION OF RESOLUTION CORRECTIVE ACTION 1-8 Condensate return valve control lacks ability to Operators can work with present on-Evaluation of throttle control indicates equilibrate heat removed by condenser and decay off control. Evaluate throttle available delta P is limited; impractical heat from reactor.
control.
to insta11 1 arse size globe valve.
1-9 Condensate demineralizers have limited capacity A fluid system modification is This is a non safety system. Since this
- especially at high powers.
necessary to correct this problem is not a control room item it will be fully. Individual " runout" alarms tracked outside DCROR.
for feed pumps would help. Evaluate after completion of demineralizer mod now being made.
1-10 Operator is deprived of a rate-of-makeup Evaluate rearranging CR0 flow meter.
Evaluation with operators indicated re-indication as flow increases.
arrangement not necessary. Flow indication becomes pegged only when second CR0 pump is started during an emergency which is a rare occurrence. If emergency occurs, operator would know flow is above 100 GPM.
1-11 Low power feedwater control requires full-Evaluate a fluid system modification Valves were repaired and operator control time operator attention and results in (addition of Main Feed Regulator has improved. No further modifications thermal cycles to reactor vessel nozzle.
Block Valves) to correct, are required.
1-12 Excessive reach required te operate valve Consider automatic control or Human Factors evaluation indicated to control reactor level during startup, improve location for manual control, modification not necessary.
1-13 Need controls for diesel generator output Analyze, not clear control is Evaluation indicated that because of breakers.
required.
diesel generator auto control design, remote operation of output breakers from control room is not required. Failure of breaker to close on sequencing would require the operator to investigate local indicat:3ns, even if control room had a breaker control.
1-14 Some controls are too sensitive.
Evaluate on a case basis.
Fcedwater flow control and letdown flow control were studied. Maintenance program for the feedwater values has been upgraded and problem of control of feedwater with the HP block valves corrected. Letdown control sensitivity problem is not related to plant safety.
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DEFICIENCY DESCRIPTION OF RESOLUTION CORRECTIVE ACTION i
1-15 Controls rotate opposite way expected.
Evaluate on a case basis.
Main turbine associated controls on Panels 7F, SF/9F, and 13R were evaluated as well as the speed changer controls for the
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diesel generators. The deficiency concerning the main turbine governor does not affect plant safety. Human factors evaluation indicated that modification of diesel generator controls wculd suffer from negative transfer. New controls for ESSF diesels to be installed 12R will incorporate a speedchanger that rotates according to industry standard.
1-16
~Some variables values are not accurately Treat on a case basis.
This item was followed up as part of walk-measured by recorders.
throughs for the relabeled replacement recorders installed during last outage.
During these walkthroughs, no specific instance was found where a variable was inaccurate due to a deficiency in the I
sensor. Quality of recorders to be l
improved as part of recorder replacement program, 11R.
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page 4 of 8 ITEM he.
DEFICIENCY DESCRIPTION OF RESOLUTION CORRECTIVE ACTION i
2-21 Arrangement and labeitne of ventilation system Relabel and consider incorporation Labeitne and demarcation to be provided.
I controls is confusing. Mimic would help.
of limited mimic. (GS)
Mimicing and rearrangement not required per Human Factors evaluation 2-42 Some display scale graduations and unit labels Scale graduations and labels will Recorders have been replaced, digital dis-are too small and difficult to read.
be improved, where meter size plays have been added for key variables, permits. Uncorrected meters will scales are improved, none of controllers be evaluated for replacement.
are important to safety.
(G1.G2) 2-49 Yellow color code has various meanings.
All indicators will be reviewed and Color code ull) confons to consistent changed to the color commonly used standard, scheduled in 11R.
in the utility industry. (G6) 2-56 Ptsup and valve indicator lights are less than Replace old and discolored lens Lens caps will be changed out on sattty 10% brighter than their backgrounds.
caps. Evaluate solutions to light related systems, schedulej 11R.
variability problem.
2-66 Drywell vent and purge controls are located on a Relabel and demarcate. Consider Human Factors evaluation indicated back panel and arranged in a confusing way with rearranging to provide mimic.
rearrangement not necessary, relabeling inadequate labeling.
(G1. GS) will occor 12R.
2-07 Control switches for valves in cleanup system Relabeling will mitigate; esimicing Relabeling will be performed 11R. Human are confusingly arranged.
should be evaluated. (GI) (GS)
Factors evaluation indicated mimicing and rearrangemset not necessary.
j 2-69 The condenser backwash controls are mirror Relabel, evaluate rearrangement Relabeling will be performed 11R. Hassan imaged.
and/or mimicing. (G1. GS)
Factors evaluation indicated simicing and i
J rearrangement not necessary.
2-70 Electrical system displays not well grouped.
Labeling may mitigate. Consider Mimicing and labeling will correct. IIR.
selected rearrangements.
(Gl. G57)
I 2-71 A mimic would be useful in checking valve lineup Consider rearrangement or Relabeling will be performed 11R Human (Condenser Backwash Centrols).
mimicing.
Factors evaluation indicated mimicing and rearrangement not necessary.
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Page 5 of 8 ITEM No.
DEFICIENCY DESCRIPTION OF RESOLUTION CORRECTIVE ACTION 2-74 For certain angular positions, the needle of the Consider replacement of meter Diesel generator voltage and power meters GE circular electrical meters can obscure the scales. (G2) and battery bus A. 8 and C voltage and number adjacent to the scale mark to which it is current meters will be replaced with vertical meters in lit. No other circular pointing.
meters are required to be used during implementation of EOPS.
2-75 Differences in units exist between rate and Evaluation will be done to add BA #328030 will correct, will provide integral displays for fluid system.
labeling showing tank capacities labels indicating relationshjp between and relationship between volume volume and level. IIR.
and level.
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Pap 6 of 8 1
4-l ITEM No.
DEFICIEIICY.
DESCRIPTION OF RESOLUTIOR I
CORRECTIVE ACTION 4-17 No display or alans for reactor building steps Consider adding appropriate alarus The torus rooms do not have sumps as such, or torus room sump in control room.
or displays in control room.
but the floor drains empty into Beactor Butiding Samp 1-6.
RX B1de. Samp alarm will be added as part of BA 4g2791 in Cycle 12.
4-37 Design and operation of strip chart recorders is Replacement of some multipoint Some recorders replaced 10R. Replacement inadequate.
recorders is considered. Evaluate program extends over outages 12R and 13R.
i need for trend information on re-All recorders containing EOP, variables maining recorders (both multipoint were replaced in outage 10R.
I and 2-pen). Provide replacement i
recorders or other means of dis-playing trend information (e.g.,
computer trend) where required.
(G3, G9) 4 4
4-39 Selection of time scale and recorder speed often Replacement of some multipoint Some recorders replaced 10R, replacement do not allow the rate of change information the recorders is considered. Evaluate program extends over outages 12R and 13R.
i operator needs to be inferred from the recording.
need for trend infonnation on All recorders containing E0P variables were remaining recorders (both multipoint replaced in outage 10R.
and 2-pen). Provide replacement recorders or other means of j
displaying trend information (e.g.,
computer trend) where required.
I (G3, G9)
{
4-43 All the torus water level instrtments uttitze Investigate means for ensuring Redundant instrtmentation and alarm re-4 a common standpipe.
standpipe is full.
sponse procedure cover this concern, no modification required.
i 4-45 Operator must confirm the de-energization of the Indicator lights should be put on Indicator 11'ghts will be put on front 8 scram solenoids by checking the 8 indicator front panel.
panel 11R, light bulbs tested at periodic lishts on one of the back panels. In addition, intervals to avoid error.
burned out indicator light bulbs can lead operator to make a serious error.
4-58 Two-pen recorders fall as is and the absence of On replacement 2-pen recorders.
Important parameters have redundant analog chart motion may not be immediately obvious.
consider use of " power on" light.
and digital displays.
5 (G3) l 4-59 Controls difficult to reach, (ATWDS and Steam Consider relocation of steam line Actions are infrequent and of a monitoring 1
line valve controls too high, others too low).
valve controls, for others, no or test nature and not time critical:
corrective action recommended at rolling step ladder available, no modifi-this time.
cation necessary.
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Page 7 (f 8 i
t ITEM 100.
DEFICIENCY DESCRIPTION OF BESOLUTION CORRECTIVE ACTION 1
4-60.
Vacuum ptmp controls'on panel 13R are opposite Consider rearrangement, relabeling.
Human Factors evaluation indicated con-the normal left-to-right sequence.
(G5 G1) trols are not reversed; relabeltne and demarcation program for back panels 1
scheduled for 12R.
4-61 Certain valve controls on panel 12XR are out of Consider rearrangement.
Human Factors evaluation considers re-normal sequence, relabeling. (G5. GI) arrangement unnecessary; operator takes responsive action. does not initiate active control. Valves are not in,left to right l
numerical sequence: however, ntsmerical a
sequence has no relation to functional sequence and operator masst operate based on 1abel functional description. Seven valve controls switches are listed under this t
deficiency. One of the switches is used i
during an E0P for a deliberate action (venting the drywell) at a point in the procedure when there will be little time pressure for execution. (This is not an issuediate action in the EOPs). The control i
is clearly labeled, occupies the upper lef t hand corner of the set of controls in j
i question and is also used by the operator during routine start-up and shutdown sequences.
4-62 Controi for the 3 feedwater ptamps are in a Consider rearrangement.
Hasman Factors evaluation with operators horizontal array. while the controls for the 3 relabeling. (G5 G1) showed rearrangement not necessary; condensate pumps that supply them are arranged labeling and demarcation to be performed l
vertically IIR.
443 MSIV test Pushbuttons are hard to operate.
Relocation of these pushbuttons (to Human factors study indicates rolling step a lower location) may improve ladder available for the convenience of operability. (GS) operator. Operators are satisfied with r
location of pushbuttons. Pushbuttons will not be moved.
J On pane's 13R. left and right, test selection Consider switch replacement.
Rarely used. Hasman Factors evaluation I
444 switches for the reheat stop valves and the showed not confusing to operators, no selectors for the turbine bypass valves rotate modification required.
through 360.
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Page 8 of 8 ITEM llo.
DEFICIENCY DESCRIPTION OF NESOLUTION CORRECTIVE ACTION i
6-10 There is no means for adding or controlling Evaluate installing. reliable Humidity study indicates readings within humidity.
humidifier.
acceptable boundaries.
6-12 Present location of GSS/GOS office is unable to Relocate GSS office to room Computer will be removed in 12R and room prevent casual entry to control area by currently occupied by Prime will be available to use as GS5 office.
personnel who have no reason for being there.
Computer.
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