ML20212M327

Forwards Addl Info on Crdr Summary Rept Re Proposed Design Changes,Per NRC 850827 Request.Alarm Investigations Reviewed to Identify Previously Cited Nuisance Alarm Activations

ML20212M327
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/18/1986
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Berkow H Office of Nuclear Reactor Regulation
References
P-86505, TAC-56125, NUDOCS 8608250444
Download: ML20212M327 (31)

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August 18, 1986

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4 Unit No. 1 P-86505 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention:

Mr. H. N. Berkow, Director

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Standardization and Special Projects Directorate Docket No. 50-267

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SUBJECT:

' Fort St. Vrain Control Room Design Review Summary Report

REFERENCE:

1) NRC Letter (G-85363)

Hunter to Lee Dated 8/27/85

2) PSC Letter (P-85384)

Warembourg to Butcher Dated 10/29/85 Dear Mr. Berkow; i

The purpose of this letter is to provide you with Public Service

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Company's ninth submittal in response to the requests of Reference 1 above.

This completes the submittals as listed by Attachment 7b

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provided by Reference 2.

j The purpose of these submittals is.to provide you with specific information relative to the proposed Control Room Design Changes.

This information is submitted as Attachment 6b-26 with a supplement to Attachment.9 as referenced by "Publ.ic Service Company's Response

. f to the Nuclear Regulatory Commission's1 ' request for additional informati.on'" included with Reference 2.

If you have any questions, please contact M. H. Holmes at (303) 480-6960.

Very truly yours,

[/Y /Y5-uw D. W. Warembourg Manager, Nuclear 082604 Engineering Division

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ATTACHMENT 6b-26

SUMMARY

OF THE CONTROL ROOM IMPROVEMENT DESIGN PROCESS AS APPLICABLE TO' THE ANNUNCIATOR SYSTEM-(ALARM INITIATING' CIRCUITS) t 0

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FOREWORD NUREG-0737 Supplement 1,

Section 5.lb requires-that a Control Room Design Review (CRDR) be conducted to identi fy human engineering disccepancies.

Section 5.lc requires that these discrepancies be assessed and design improvements selected to correct these discrepancies.

.Public Service Company (PSC).has conducted the required. review of the Fort St. Vrain Control Room. Approximately eight hundred forty eight (848) discrepancies or classes of discrepancies were cite.d.

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discrepancies were assersed to determine.their potential for ~ causing

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an operating error and the potential effect of any error.

(Certain discrepancies are known to have caused' errors).

An improvement program has been. selected which meets the r.egulatory requirements and proposes to impro/b the operability'and functionality of the Control Room.

The regulatory requirement for the CRDR and the follow-on improvement program was directed toward the improved handling of emergencies and not specifically toward improved production.

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Company's improvement program is directed toward both normal operation and the handling of emergencies.

BACKGROUND - Public Service Company has initiated an integrated improvement program based on functionality rather than particular classifications of problems ~.

T.his. approach is -first,.one 'of determining functional g roupi n'g s,

followed by' dema rcati ng',

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hierarchical labeling, correcting indicator. scaling, complying with established conventions (color coding,' switch p'ositions', etc.).

The following steps constituted the planning portion of the integrated improvement program..

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Elevation Drawings of each control panel wefe color coded to show applicable HEDs as either,

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relabeling, relocations, scaling, deletions, or equipment changeout.

This scheme provides an overJ ew of the problems documented on each control board.

All HEDs involving Alarm Locations, and multipoint alarms were reviewed.

System function and operator response were considered in grouping, deleting and adding alarms..

Paste ups of all alarm panels were' completed:

to show proposed'rea'rrangements.'

. Functional grouping of controls and indications was approached by first preparing point interaction sketches for various systems or by direct reference to system P&I drawings.

This effort was, in effect, an extensive operational analysis which considered the dynamic considerations-of control groups and 1 -'

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arrangements.

This activity reviewed the i

purpose and use of each and every component on the main control boards.

Interviews with operators and training personnel were conducted to determine operator interpretations and actions.

.Centrols and indications were then arranged ~in functionally related groups. Associated alarm

-locations were rechecked,to verify that the

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more desirable locations were selected.

The function relationship of adjacent indicator and control. groupings were reviewed.

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Revised ' drawings were prepared to show the proposed arrangements.

Certain of these drawings were color coded to aid in differentiating between. groupings.

These

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drawings were then utilized to determine the scope of each change package (Change Notice).

Change Notice (CN) numbers were assigned to each effort identified above.

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IMPROVEMENT PROCESS METHODOLOGY The Improvement. Process for the annunciator system starts with the documeritation 'and drawings produced during the~ improvement planning process' described in. the BACKGROUND presentation pcrtion of this summary. An individual ~ designer was assigned the responsibility of evaluating the annunciator system.

Since this'~ individual had not participated in previous ' efforts, an educational process was initiated to acquire a thorough understanding of the annunciator system and each alarm.

System descriptions, Piping & Instrument

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diagrams, electrical drawings, operating procedures and 0 & M manuals were studied to gain'this thorough understanding.

An operational analysis was conducted for the system.. (This in-depth analysis was

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in addition to that completed for the CRDR and planning purposes.)

This Operational Analysis provided additional basis for determining any changes to the annunciator control switches.

I Operating and training' personnel were interviewed to solicit operational philosophies for.the annunciator system.-The Operational value~ and. function of each alarm was. addressed.

Informational Ye' qui,rements.we're'again discussed. '(This' informational' requirement ~

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effort is - in addition to that conducted for Emergency Operating Procedures task analysis).

All HEDs applicable to the annunciator system were reviewed and the tentative fix evaluated for its corrective value within the integrated approach.

HEDs written against the alarms a'nd control switches by.the Emergency Operating Procedure task analysis "Information.and Control Requirements." effort, were reviewed with 7

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particular attention to any potential safety considerations.

Any

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p.reviously prepared investigative information was studied.

All factors were evaluated in considering any changes to the-system.

SPECIFIC Alarm Initiating Circuit Modifications - (Shange Notice (CN)-2109 preparation package.)

Research.- During this phase, the HED's'and records'of other alarm investigations were reviewed _to identify previously cited nuisance alarm act'ivations~.."Nuisancs alarms are defined as those alarms that activate the alarm system when an out-of-limits parameter does not exist. Typical examples of nuisance alarms are as follows:

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Alarms. that are activated by plant or system configur.ations that do not signify an out-of-limits parameter.

For example, the discharge flow of a pump is alarmed for low flow.

However, for certain system configurations the pump is normally "0FF" -

pump discharge flow is expected to be icw.

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case, the alarm should be qualified such' that it is active only when the pump is required for system operation.

2.

Alarms that are activated upon a manual switch

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operation by the operator.

For example, a pump has a " TRIP" alarm.

This alarm ' circuit should be qualif.ied to initiate an alarm for automatic trips only.

If the operator chooses 'to manually trip the

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pump, an alarm is not necessary to indicate that a switch was just operated.

3.

Alarms that are activated during equipment start-up or adjustment without providing time for system stabilization.

Returning to the example of a low

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flow alarm on the discharge side of a pump, upon starting the pump, the alarm should be time delayed prior to activation of the alarm circuit to assure that the pump has reached operating capacity.

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-G Conceptual Design - ~After all the relevant documents were' reviewed ~

and the nuisance alarms identified, a proposed design was developed which modifies the initiating circuit of each alarm to. minimize or eliminate the nuisance alarm activations.

The proposed modifications for these alarms are as follows:

1.

Loop.1 Feedwater. Flow Low (typical) - This alarm is a-nuisance during plant shut-down and start-up due-to-expected ' low flow. ' Qualify the alarm with.the

~ Interlock Sequence' Switch (ISS).toienable the' alarm in the " POWER" position only (alarm inactive in start up and low power plant configuration).

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~2.

Unit an$ Reserve Auxiliary Transformer Parallel.-

Normal operating procedures call

.for the transformers to be parallel during switch over between units. Add time delay to activate the alarm circuit to indicate that the units have been left in parallel configuration.

3.

480 Volt Buses Parallel Normal operating procedures call for energized buses to be tied together during switch over of feeds. Add time delay to activate the alarm circuit to indicate that h

,t e energized buses have been left tied together.

4.

Amplidyne Regulator Off Alarm is up when'the operator has manually placed the regulator transfer switch in "0 F F."

or " TEST" position.

En~able the alarm when. transfer' switch.is placed i n. "0N.

Alarm will now indicate Amplidyne Regulator Trip.

5.

Helium Recovery Compressor Lube Oil Low or Both Off

- Alarm is up when both compressors are manually

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tripped by control switches.

Separate this multi-point alarm into individual " Lube Oil Pressure Low" for each compressor (A and B), " Helium Recovery Compressor A Trip" and " Helium Recovery Compressor B Trip" alarms.

Qualify the. trip alarms with'their respective handswitches so that these alarms will indicate automatic compressor trips.

6.

Buffer Helium Flow' Hi a

buf fer helium system :is 'gh Low (Typic' l) - When.the shutdown,*.the, alarms 1.are act i ve~.

Qualify alarms to be active ~ when the circulator buffer helium isolation valves are open and buffer helium is in service.

Delay the alarms to provide time for the flow to stabilize.

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Guard Helium Flow High'(Typical) - When the guard helium system is shutdown, the alarms are active Quali fy alarms to _be active when the circulator buffer helium isolation valves are open guard helium in service.

Delay the alarms to provide time for the flow to stabilize.

8.

HTFA Purge Flow Low - Alarm is active wh'en' the PCRV is deprissurized

. purge. flow is not required during this. condition.

Purge' flow'is obtained from the Purified Helium Header.

This header is charged by the Purified Helium Compre'ssors (PHC).

Qualify the flow alarm to be active when-one or more of the PHCs are ~ in s.e rvi ce.

Delay the alarm to prov'ide time for the header to become pressurized during compressor start-up.

9.

Cold Reheat Steam Header Press Low - Alarm is nuisance during plant shut-down and start-up due to

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expected low pressure. Qualify the alarm with the ISS to enable the alarm in the " POWER" position only.

10.

HVAC Alarms - I-15 HVAC controls frequently cause alarms to occur on I-06 Section B panels.

Operator must ' move betwee'n :I-06 and I-15 to acknowledge

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nuisance alarms and m.inipulate HVAC controls.

HVAC alarms will be' functionally grouped'on'a new I-15 alarm panel above their associated controls.

Reactor Plant Exhaust Fan Low Flow and PCRV Pipe

. Cavity Recirculation Fan Low Flow. Alarms will be time delayed to' permit stabilization of HVAC flow prior to activating the alarm.

The following Design Directives apply to work assigned to CN-1925:

NUMBER ISSUE DESCRIPTION DD-AAS-1 A

ABBREVIATION, SYMBOL, AND ACRONYM SELECTION DD-APL-1 ANNUNCIATOR PANEL LEGENDS DD-ASP-1 ANNUNCIATOR SELECTION AND PLACEMENT

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Sumary of Changes

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SUMMARY

OF CHANCES - ALARM INITIATING CIRCulTS j.

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PROPOSED QUALIFiCAT10N 1

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l.l-05C IFLOW LOW l low flow.

1" POWER" position only.

l 1-3 ILOOP 2 FEEDWATER lNuisanco a la re during sta rt-up due to expected l Interlock with ISS to enable alarm in l I. "".

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1 1.

t II-06E.5-8s IUself at RES AUX TRA815 l Alare occurs under normal operation when both ITime delay alarm to alert operator thatl

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.I Itransformers are momentarily tied together.

lboth transformers have been lef t tied I j

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- II-06E 2-7 1480V BUSES PARALLEL l A l a rm occu rs unde r no rma l ope ra t i on when buse s a re l T i me de l ay a la rm to a l e r t ope ra to r tha t l i

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loosentarily tied together.

l energized buses have' been lef t tied l

1 1

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' ll-06E 3-2 lAMPLIDYNE REGULATOR OFFIAlars is up when control switch is in "0FF" or IUse handswitch to enable the alarm in )

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l l" TEST".

Ithe "Oll" position only.

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.118-068 1-2 IIIE REC COMPR LUBE DIL ligelium Recovery Compressor trip alarm comes up l Qualify alarm with compressor hand-I Vl%

lLO OR BOTH Off lwhen both compressors are manually tripped.

1 switches to enable the alarm for. auto-l pl

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l I

lmatic trips only.

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4

'll-02A 1-1 l BUFFER HE FLOW HIGH-LOW lUpon openlng the Burrer Helium to CIRC isolation IQualify alarm with the isolation valve l

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-l(Typical) l l valves during the circulator start-up procedure, l control handswitch to enable the alare I k

I i

Ithe riow alarms activate.

lonly when.the Burrer Helium supply to l-l l

1 lthe circulator is in service. Add timel F

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l idelay to ensure flow stabilization.

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A

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II-13C 1-6 lCUARD HE FLOW LOW lupon opening the Burfor Helium to CIRC isolation l Qua l i fy a la rm wi th the i so l a t i on va l ve l g.

l(Typical) l ivalves during the circulator start-up procedure, l control handswitch to enable the alarm l 7

.l l

Ithe flow alarms activate.

lonly when the Buffer He supply to the l l

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l circulator is in service. Add time l-

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l delay to ensure flow stabilization.

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S ATTACHMENT B

SUMMARY

OF CHANCES - ALARM INITIATING CIRCulTS k

1 ALARM l

PHOBLEM i

PROPOSED QUALIfICATBON l

i LOCATION 1

LEGEND.

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'F li-13C 2-2 litifA PURGE FLOW LOW l Nuisance alarm during PCRV depressurized condi-Enable the alarm when a Purified Helium l F

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ltions.

Compressor is in service. Add time

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[

delay on compressor start-up to ensure s

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l lthat the, purge flow is stabilized.

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i 1

E 11-058 4-6 ICOLD REllEAT STEAM INuisance alarm during low power operation, lQua l i fy"a la rm wi th I SS to be ac t ive 1

E

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lHEADER PRESS LOW l

lin the POWER" position only.

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1 1

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ll-06 lHVAC ALARMS 11-15 llVAC controls frequently cause alarms to lHVAC a la rms wi l l be funct iona l ly.

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l l

loccur on 1-06 panels. Operator must move between Igrouped on a new 1-15 alarm panel abovel i

i 18-06 and 1-15 to acknowledge alarms and manipulateltheir associated controls. HVAC equip-l l

8 lHVAC controls.

• Iment ala rms (control room and remote 1

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l l

icontrol panels) will be qualified to 1

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lainimize or eliminate nuisance alarms. l

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SUPPLEMENT to a

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APPLICABLE TO ALARM INITIATING CIRCulTS

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ATTACHMENT 9 HEDs Having Final Dispositions Dirrerent From The Proposed Disposition Shown in Attachment B I

Of The Summary Report

,f n

E K-HES PROBLEM ORIGINAL DISPOSITION FINAL DISPOSITION REMARKS CLAS$1 F ICAT 10N 7

0425 8g Relocate Change-out Uni t/ RAT pa ra l le l alarm to be qualified b

and functionally grouped on 1-06F.

I.

s 0436 8g Relabel Change-out 480V Bus pa ra llel alarm to be qualirled, I

runctionally grouped and retabeled.

i 5

0442 8b Relocate Change-out PAL-21107/8 to be qualified with Hellum h

Recovery Compressor control switches, i

i 0790 8b Relocate Change-out HVAC ala rms to be functiona l ly grouped on a new 1-15 a la rm pane l and qualirled to eliminate or minimize nuisance alarms.

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