Text

Preliminary Rev 1 to Control Room/Technical Support Ctr Essential Air Conditioning Sys Status Rept
	ML20197C721
Person / Time
Site:	Rancho Seco
Issue date:	09/19/1986
From:	Naleway J, Bernard Thomas; SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	;
Shared Package
ML20197C690	List: ML20197C682; ML20197C699; ML20197C704; ML20197C712; ML20197C721;
References
	TAC-61631, NUDOCS 8611060371
	Download: ML20197C721 (85)
	v • d • e

_ _ _ - _ _ _

w --

)

}

O !

l l

CONTROL ROCd/ TECHNICAL SUPPORT CENTER t

ESSENTIAL AIR CONDITICNING SYSTEM SYSTEM STATUS REPORT PREl.lMINARY -

l l

O O m' P

RBau 8th8Ha2 ,.

Y 1

l Attachment ~9.3-1 PRE IMINIRY E

E5 Pages L -

1 J

r '

CONTROL ROCM/ TECHNICAL SUPPORT CENTER ESSENTI AL AIR CONDIT CT' NG SYSTEM SISTEM STATUS REPORT gar -

PREPARED SY: Bob Themas/Jett *2aleway Date: 08-04-86 Revision 1 08-07-86 Effective Revision 1 Cate INTERIM APPROVALS:

~

Performance Analysis Group Cate ._

Deputy General Manacer, Nuclear Date g O

TESTING APPROVAL: \ r // Date 9- /4 - 74, ~~

//glniEj."re_nE=g'&?

4 Et.u fow-e Date ? /*ffi '

LIST REV'EW GRTJP Ca#ew. N9 Cate

/ /

RESTART ACPROVALS: Cate Sy D & E.,4 a .WUAabC:M Date

-:nD o y .. c_. c .o. :..os ::a Date FERFOR.~.ANCE ANALYSIS 3RCUF Cate OEPUTY GENERAL MANAGER, NUCLEtR 4

v .,. -

PREUMRGY

TABLE OF CONTENTS SUBJECT PAGE

1. EXECUTIVE

SUMMARY

1-1

2. SYSTEM FUNCTIONAL DESCRIPTION 2-1 A. GENERAL DESCRIPTICN

8. FUNCTION /SCURCE CROSS REFERENCE l l

C. SOURCES l

3. TEST REVIEW 3-1

4. REVIEW OF RECO.TCCA1ICUS AND NESOLUTICNS 4-1 A. DISCUSSICN

9. INDEX OF PROBLE.".S

5. REVIEW OF TEST RESULTS FRCf1 DAVIS-BESSE 5-1 I

6. REVIEW OF MAINTENANCE HISTORY

6-1

7. SYSTEM INSPECTION 7-1 l

l l

.f 11 PREllMINJRY

EXECUTP.'E COMM.*,.T.'

()1. GENERAL REPORT DESCRIPT!CN The Restart System Review and test program is explained in quality control instruction (QCI) 12. Attachment 11. QCI - 12 lists the selected systems for which System Status Reports are generated. The Control Room / Technical Support Center (CR/TSC) Essential Air Conditioning System is a selected system.

This report documents the information on the CR/TSC Essential Air Conditioning System to verify the System is suita'o le for return to power oceration.

To expedite work, sections of the Status Report will be submitted to the Performanc.e Analysis Group (PAG) for interim approval as the sections are completed or updated.

2. SYSTEM FUNCTICN DESCRIPTICN A. General Functional Description The Control Room / Technical Sucocrt Center (CR/TSC) Essential Air Conditioning System is designed to provide a suitacle environment for equipment and station operator comfort and safety.

j During certain abnormal events, as noted below, the CR/TSC Essential Air System is automatically actuated and started. The CR/TSC Essential Air

(~J T Conditioning System is comprised of two 100% capacity redundant trains. Each N_ train is comprised of the following:

Essential Filtration Unit consisting of a moisture eliminator, electric duct heater coil, two HEPA filter banks, two carbon filter banks, and a booster fan.

Essential Air Handler consisting of a medium efficiency filter bank, OireC: expansion Occling Ocil, and Circulation fin.

Essential Condensing Uni: consisting of a reciprocating refrigerant ComoressCr, air Occled Cor. Censing Ooils, Concensing fans, receiver,anc assCCia:Gd refrigerant piping &nd Valves.

Fourteen campers ar.d associated cucts.

The CR/TSC Essential Air System performs :ne following functions:

1. Isolation of the CR/TSC from potentially radiologically contaminated air curing a radiological event by automatically closing sixteen normal air conditioning system isolation damcers (eign: isolation dampers are actuated by eacn train) and opening twelve essential air handler isolation dampers (six are actuated by eacn train).

t~ /

1-1 PREOMNARY

(Continued)

2. Isolation of the CR/TSC from air potentially containing toxic gas during c- a toxic gas event by automatically closing eighteen isolation dampers

() (nine isolation dampers are. actuated by each train) and opening ten essential air handler isolation dampers (five are actuated by each trair.

3. Provide cooling for the CR/TSC during radiological, toxic gas, CR/TSC

. high temperature, or loss of offsite power events by maintaining the CR/TSC temperature at 80*F or less.

4. Prevent infiltration of potentially radiologically contaminated air into the CR/TSC during radiological events by pressurizing the CR/TSC to 0.12S 1WG relative to outside atmosphere.

5. Provide fresh, filtered, conditioned supply air for CR/TSC ventilation during radiological and loss of o.ffsite power events by maintaining a flow of 3,200 cfm through the Essential Filtration Unit.

3. PEVIEW PRCELEM/RESOLUTICN

.1 General Discussion -

The problems icentified for the CR/TSC Essential as Conditioning System as of July 30, 1986 have been classified into four categories:

fiodifications, Administrative (Training, Procedures, Drawings), Studies, )

and Maintenance. Figure 1, CR/TSC Essential Air Conditioning Report Scope / Sequence Chart, is a graphical representation of the problems.

f'h

.2 Approval Problems / Resolutions

.1 Reference time meters to facilitate carben filter testing after every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months elapsed operating time should be installed.

(Priority 2)

.2 Tes Agen: Injection Manifolds necessary for inslace filter leak testing must be designed, installed, and tested. (Priority 1) l

.3 l Mcdifications to reduce Con:rcl Recm noise generated by Essential l Air System operation must be cesigned ard accen;1ishec. (?riority 1) l l

4 Vibration of com enents in the Condensing Units should be evaluated. Mcdifications may be necessary. (Pricrity 1)

.5 The Normal Air System low air flew switch snould be relocated from the cold air supply duct to the return air duct. (Priority 2)

.6 Pressure taps to , enable measurement of Technical Suc;crt Center pressure relative to.the atmosphere should be designed and installed. (Priority 2)

.10 Centrols fcr condenser fan cycling to facilitate system 0 eration

(";} .uring cold. weather mus: be cesigned anc installed. (Priority 1) s- <

1-2 PREUMN3Y D

.11 Modifications to the Refrigeration System to facilit=+e nint:n r.c:

must be designed and installed. (Priority 1) rx .12 Fire dampers should be installed between the Control Room and the

(_) Technical Support Center. (Priority 2)

.2 Maintenance (13 thru 23,25,26)

.13 Hi temperature actuation of the Essential Air System must be investigated and resolved. (Priority 1)

.14 The Control Room Normal Air distribution system must be balanced tv ensure uniform cooling. (Priority 1)

.15 Actuation of the Essential Air System by the Chlorine Detectors must be investigated and resolved. (Priority 1)

.16 Infiltration thru the Essential Air Handler access door must be resolved. (Priority 1)

.17 Essential Air System isolation dampers are not functioning .-

properly. (Priority 1)

.18 1he CR/TSC Toile: Area Exhaust Damper operation must be 1 investigated. (Priority 1) )

.19 ' The Shift Supervisor exhaust damper operation must be investigated.

(Priority 1) p4 5

J

.20 The Control Room Pressurization Problem must be resolved.

(Priority 1)

.21 Operation of the CR/TSC Essential Air Refrigerant System is comcromised by certain ::pir.g anc control preolems. (Priority 1)

.22 The Control Roco does net apcear to be uniformly coolec by operation of the Essential Air System. (Priority 1)

.23 Air flow thru :ne Esser.:ial Air Filtra icn Units may ce excessive for several minutes after :ne systems are actuated. (Priority 1)

.25 The flow transmitter for Essential Air Train A must be calibrated.

(Priority 1)

.26 The flow transmitter for Essential Air Train E must be calibrated.

(Priority 1)

.3 Administration (24,27 thru 31)

.24 A Flow Transmitter Calibra:icn Procedure must be prepared for !

calibration of Essential Filtration Unit flow transmitters.

, (Priority 1)

(s)

%i '

1-3 3REL MERY

.27 Op3 rating Procedure A.14 must b2 revised to trovido n pe r s t c. eitS more complete and detailed instructions for operating the CR/TSC Essential Air System. (Priority 1)

(-

(_) .28 Surveillance Procedures must be revised to assure that damper function problems are not masked. (Priority 1)

.29 Procedures for accomplishing routine and non-routine maintenance tasks should be prepared. (Priority 2)

.30 Additional Training is necessary to enhance operator knowledge of the CR/TSC Essential Air System. (Priority 1) 4 Studies (32 thru 39)

.32 Carbon filter tray mounting in the Essential Filtration Units shovir be evaluated for improvement to facilitate maintenance. (Priority

.33 The affect of a freon leak in the Air Handler evaporator coil ucon CR/I'SC occupants should be studied. (Priority 2)

.34 The long term affects of diesel exhaust uron the Essential Filtration Unit carbon filter should be evaluated. (Priority 2)

.35 i The affect of CR/TSC Essential Filtration Unit initial flow rate on CR/TSC radiation exposure must be evaluated. (Priority 1)

.36 The affect of Essential Air System Safety Features Actuation upon

(,s) Control Room operator work load should be evaluated. (Priority 2)

.37 Essential Air System crersting status indication in the Control Rco.T must be evaluated. (Priority 1)

.38 Essential System Com:ressor Com:artment temzerature during no:

weather operation must be evaluated. (Priority 1)

.39 Suitability of the Comoressor Motors for the application snculd be evaluated. (Priority 1)

I

.3 Problems / Resolutions for PAC Approval l 1

.1 r.cdifica ions (7,B,9)

.7 The CR/TSO Radiation Monitors which actuate the Essential Air System must be mccified to prevent inadvertant actuation. (Priority 1) l

.8 Power Su= plies for the Essential Unit Controls and instruments should be revised.- (Priority 2)

.9 Arrangement of the Refrigeration System components should be changed to facili ste maintenance. (Priority 2)

(

%s

) s 1-4 PRELMNARY

,. .2 Maintonanca No additional problems for approval.

v .3 Administration-No additional problems for approval.

.4 Studies No additional problems for approval.

.4 PROGRESS (August 8, 1985)

.1 Modifications

.1 Engineering Change Notice (ECN) A-5782 has been initiated to inste reference time meters. (problem 4-1)

.2 ECN R-0788 has been initiated to install Test Agent Injecticn Manifolds. Purchase Request 43079 is being processed to pure..ase tne necessary hardware.

(Problem 4-2)

.3 An evaluation of Control Room noise levels has been completed. A reduction of Essential System air flow has been proposed to reduce noise level. Preparations are being made to obtain sound measurements with the Essential System flow reduced to 80% of the present flow.

O V

(Problem 4-3)

.4 Both Trains of the Essential Air System have been ocerated to obtain data for engineering evaluation of condensing

Uni component vibration, Compressor Compartment temperatures, and uniformily of Centrol Room cooling. (Problems 4-4,4-13,4-22,4-38)

.5 ECNSystem Air R-0314 hasSwitch.

Flcw been initiated to relocate the Ocntrol Recm Normal (Problem 4-5)

.5 ECN R-0182 and ECN R-0164 have been initiated to install radiatien meniter grounc ca les and change :ne raciation actuation of the Essential System. (Prchlem 4-7) i

.7 ECN R-0796 has illuminating been initiated to provide a new pcwer supply for lignts. (Proclem 4-8) )

.8 ECN H-0789 has been initiated to =rovide isolation valves for <

ccmpressor instruments to facilitate calibration. (Problem 4-9) {

.9 ECN R-0769 has been initiated to provide centrols for condenser cycling. (Problem 4'10) 0 1-e l

PRELMNARY

I

- j

.10 FnN c-074a Pad I;.*1 7 0750 hasi b==n initietec to acc fire dampers in Essential System duct work and upgrade fire dampers in Normal Syst>m m duct work respectively. (Problem 4-12)

I'--) '.11 Work Request Number (WRN) 115248 has a been initiated to obtain ca.:

which will be used for part of the evaluation of the Normal Air Distribution System. (Problem 4-13 and 4-14)

.12 WRN 116218 has been initiated to investigate Chlorine Detector actuation problems. (Problem 4-15)

.13 WRN 116217 has been initiated to eliminate Essential Air Handler access door infiltration. (Problem 4-16) l

.14 WRN 114662 and WRN 114663 have been written to investigate isolatier camper problems. The majority of the dampers have been checkec fo:

proper function. Four dampers exhibiting functional discrepancie3 have been icentified. (Proolem 4-17,4-18,4-19)

.15 WRN 115773 has been initiated to inspect the CR/TSC pressure boundaries. (Problem 4-20) .

.16 Special Test Procedure STP 1C02 has been accomplished to obtain data for evaluating the cooling capability of the Essential Air System.

(Problem 4-22) I

.17 A Maintenance Procedure for cleaning and in'spection of CR/TSC g-s, Essential Air System Dampers has been prepared and will be

(_) implemented during the week of August 11. (Problem 4-17,4-18,4-19,4-29)

.18 A detailed Project II Schedule for bringing the system to " System Reacy" status has been prepared.

1

.19 Control Recm tem erature profile data, based uren creration cf tne ;

Normal Air Concitioning System, nas been octained. (problem 4-13) l

\

1 e~.

. .r' "

'~'

PRE.M NARY l

l

system FUNCTICN DESCRIDTION A. General Functional Description

~

/T The Control Room / Technical Support Center (CR/TSC) Essential Air Conditioni i.

V System is~ designed to provide a suitable environment for equipment and stat e operator comfort and safety.

During certain abnormal events, as noted below, the CR/TSC Essential Air System is automatically actuated and started. 1he CR/TSC Essential Air Conditioning System is comprised of two 100% capacity redundant trains. Eae.n train is comprised of the following:

Essential Filtration Unit consisting of a moisture eliminator, electric duct heater coil, two HEPA filter banks, two carbon filter banks,.and a booster fan.

Essential Air Handler consisting of a medium efficiency filter bank, direct expansion cooling coil, anc circulation fan.

Essential Condensing Unit consisting of a reciprocating refrigerant compressor, air cooled concensing coils, concensing fans, receiver,and associated refrigerant piping and valves.

Fourteen dampers and associated ducts.

I The CR/TSC Essential Air System performs the following functions:

1.

73

( ) Isolation of the CR/TSC from potentially radiologically contaminated air during a radiological event by automatically closing sixteen normal air conditioning system isolation damcers (eight isolation damoers are actuated by each train) and opening twelve essential air nandler

isolation dampers (six are ac:uated by each train). Each Essential Air System Train is actuated at 10,000 e 1000 CPM.

2.

Isolation a of event toxic gas the CR/TSC frca air potentially containing toxic gas curing by autoca:ically closing eighteen isolation dampers (nine isolaticn dsmcers are actuated by each train) and opening ten essential air handler isclation damcers (five are actuated by each train). Each Essential Air System is actuated by 1 PPM cniorine gas.

S.

Provide cooling for the CR/TSC curing radiological, toxic gas, CR/TSC high CR/TSC temperature, temperatureoratloss of offsite power events by maintaining tne a: temperature of 80*F or less. Each Essential Air System train is actuated a: 80 : 1.2F Control Recm air temperature. ;

4.

Prevent infiltration of potentially radiologically contaminated air into the CR/TSC during radiological events by pressurizing the CR/TSC to 0.125 IWG relative to outside atmosphere. i pressurize the Control Room /TSC. 1500 CFM outside air is used to 5.

Provide f esh, filtered, conditioned supply air for CR/TSC ventilatien curing radioicgical and loss of offsite ;cwer events by maintaining a

(^)

'" flow of 3,200 cfm through the Essential Filtration Unti (Eaximum cooling capacity is 1,138 MSH).

~

PRRIMlm :

8. REFERENCE COCUP.FNT4 o rv10 :E0

1. Control Room / Technical Support Center Ha'o itability Study

(')/

(- 2. Rancho Seco Technical Specifications 3.13 and 4.10 l

3. Engineering Change Notice A-3920

4. Engineering Change Notice A-3660

5. Ellis and Watts CR/TSC Essential Air Conditioning System Operating and Maintenance Manuals , r113.15-103

6. Updated Safety Analysis Report Sections

7. Surveillance Procedure SP 211.01A, SP 211.018, SP 211.01C, SP 211.010, SP 211.01E, SP 211.01F Records

8. Troubleshooting Action Plan 1.R.1 and 1.R.2

9. ANSI N 509 _

10. ANSI N 510

11. ERDA 76-21 I 12.

American Air Filter Air Filtration Units TSC and Control Room; M13.16-IM01 I~')

\_-

13. US NRC Reg Guide 1.52 14 US NRC Nureg 0737

15. Soecial Test Procedures STP-189, STP-194, STP-198

16. Non-Conforr.ance Reports

17. Maintenance Information Management System

18. Plant Operatirg ErOcedure A.14 i l

e o

=-'

'R$MNARY

RE'!!O! C." .":CCnn:NCAT;;T;5 AT.G RE60tu i vra A. Discussion This section of the report contains a composite of all problems identified to date. The combined effect of the solutions being applied to the Control Room / Technical Support Center Essential Air Conditioning System will be considered to determine if all known deficiencies will be corrected.

8. Ind e,t of Problems The Index of Problems (Table 1) provides a summary of the problems associated with the Control Room / Technical Support Center Essential Air Conditioning System.

s l

1 o

~ PREllMNiRY

LADLE 1 INDEX CF PROBLEMS Original Tracking No. Problem Priori,tv Number QFS No. Status 1

Reference Time Meter Addition 2 19.00119 19.0011B Approved 2 Test Agent Injection Manifold 1 26.0016- 26.0016 Approved Installation 3 Essential Air System Noise 1 15.0035 19.0010A Approved

, Level 15.0283 15.0375 18.0016 20.0266 20.0386 22.0036 16.C013A .

19.0010A 4 Condensing Unit Vibration 2 19.0010L 19.0010L Approved 5 Normal Air Flow Switch 2 19.0011F 26.0017 Relocation Approved 22.0423 gs l 26.0017 0

6 TSC Pressure Measurement 2 Provision 26.0001 Approved

{

7 Sourious Actuation ty 1 26.0154 Radiation Ostectors 26.0154 Aoproved I a Con:rol and Ins;rumen: 2 19.0011C Power Su: plies 26.0153 Approved l 26.0153 l 9 Refrigeration System 19.0010C i

26.0152 Approved M.ccifications to Facilitate 19.0010K l

Maintenance 19.0011I-1 19.0020 21.0074 26.0152 10 Flew Transmitter Loop 1 Imoedance Approved 11 Receiver Sightglass ~

1 19.0011I-1 Approved n

u- .,

PRUMWRY

TABLE 1 INDEX OF PROBLEMS i ..\

V Original Tracking No. Problem Priority QTS No _, Number Status 12 Cooling Capability During i 19.00109 26.0167 Approved Cold Weather 26.0167 13 Refrigeration System 1 19.0010J 26.0013 Approved Modifications to Improve Performanet 14 CR/TSC Fire Dampers 2 19.0011A Approw:.

15 Hi Temperature Actuation of 1 26.0018 26.0018 Approvec Essential Air System 16 Norm &l Air System Salance 2 19.00108 26.0011 . Approved 21.0074 26.0011 17 Spurious Actuation by 1 21.0074 26.0025 I

Approved Chlorine Gas Detector

(~^ 18 Essential Air Handler Access 1 19.0011F 26.0008 Approved N- Door Leak 26.0008 i 1

19 0:eraticn of Isolation 19.00109 1 26.0004 Approved I Campers 21.0C04 20 Teile: Area Exnaus: Fan 1 26.0002 26.0002 Approved I Isclation Dam;er Operation 21 S.9ift Supervisor Fan 26.0003 1 26.0003 Approved Isolation Damper 2 solation l

22 Control Room Pressurica:icn i 19.00108 26.0006 Approved 26.CC01 l 26.0006 23 Refrigeration System Piping i 26.C014 26.0014 Approved and Control Maintenance Problems 24 Essential Air System Air ' 1 19.00108 26.0012 A; proved l Balance ~

19.C010C 26.0012

,~

'%-) .i PREllMINay a

9

lHbLt 1

,m INDEX OF PROBLEMS (8/ )

Original Tracking N o_ ., Problem Priority. glS No. Number Status 25 Essential Filtration Unit Air 1 19.00108 26.0010 Approved Flow Rate Stabilization time 26.0010 26 Essential Filtration Unit i 19.0010B 26.0009 Approvr Flow Transmitter Calibration 19.0011D Procedure 26.0009 27 Essential Filtration Unit 1 26.0005 26.0C05 Approve A Flow Transmitter 28 Essential Filtration Unit 1 26.0007 26.0007 ApprovcJ 9 Flow Transmitter 29 Operating Procedure A.14 Is 1 19.00100 19.00100 Approved Not Adequate 22.0359 30 SP.211.01A and SP.211.01D 1 19.0010D 26.0023 I Approved Are Not Adequate 26.0023,

~

31 Refrigeration System 2 19.0010D 26.0024 Approvtd k_)s Maintenance Procedures Do 19.0011I-1 I Not Exist 26.0024 32 Essential Air System 26.0021 1 26.0021 Approved Oceration Training 33 Environmental Oualification 1 21.0079 26.0150 Approved of Hardcast lace 26.01S0 34 Carbon Filter Tray Monitori g 2 19.0011D 19.0011D Approvec 35 Affect of Air Hardler 2 21.0070 25.0151 Approved Freon Leak 26.0151 36 Affect of Diesel Exnaust 2 19.0010G 19.001CG Approved on Carbc.. Adscrbers 37 Starting Air Flow Affect 1 19.00105 26.0020 Approved on Exposure Levels 26.0020 38 Automatic Initiatien of 1 26.0019 26.0019 Approved Essential Air System (m

x.>

i

~~

PRELMWRY

IABLL 1 INDEX OF PROBLEMS Original Tracking No. Probl,em P riori t,v OTS No., Number Status 39 Essential Air System 1 19.OO10E 26.0022 Approved Operating Status CR 19.0011G Indication 19.0011I-1 26.0022 40 Essential Unit Compressor 1 26.0015 26.C015 Approved Compartment Temperature 41 Refrigerant Compressor 2 19.0011H 19.0011H Approv o Motor Quality 42 Dead Bus Transfer 1 Approved 43 Condensate Orain Line 1 Approved o

i e

a 3-v PRELnNARY

SYSTEM PROELEn i Control Room /TSC Essential HVAC System (Elapsed Time Meters)

, ~1

's/ TRACKING NUMBER: 19.0011.8 PRIORITY: 2 SOURCE: Interviews, Technical Specification 4.10; RRRS 19.00119 DESCRIPTICN Technical Specification 4.10 requires sampling of the carbon filters in the essential filtration after 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of unit operation. Presently, no automatic monitoring device has been supplied to monitor the total elapsed time; therefore, operating time is estimated based upon Ocerator Legs in the Control Rocm. Since these estimates are conservative, tne carbon filters may be sampled more often :n-is necessary.

INVESTIGATION N/A -

RESOLUTICN OF, PROBLEM l

A design change has been initiated to add elapsed time meters which will be connected of each unit.to the breakers for the filtration units to monitor total operating time This change is being implemented under ECN A-5782. The surveillance f 'i

~ procedures willcarbon be revised to check these timers to verify elapsed operating time since previous replacement.

TESi!NG Startuo testing One elapsed timeof the mcdification will be ;erformec Ic verify peccer cceration of meters.

Periccic surveillances will meni:cr the elapse: ccers:ing time of the Ccr. trol ROCm Essential Eiltration Units by these me: Grs.

e s-1 PREOMNARY

i O'!OTCM PROCLEM I 1 Test agent injection manifolds necessary for in-place filter leak testing have not

(~')

v been installed and tested.

TRACKING NUMBER: 26.0016 -

l PRIORI 1Y: 1 SOURCE: NCR S4761 OESCRIPlICN HEPA and carbon filter banks in the Essential Filtration Units must be tested periodically for leaks to satisfy Technical Specification 4.10 requirements. This i testing is accomplished by injecting a test agent into the airstream ahead of each !

filter bank. Injection manifolds are necessary to ensure all regions of the filter l banks are uniformly challenged. The details of this are included in ANSI N 510, i Testing of Nuclear Air-Cleaning Systems. Test manifolds have not been installed in l the Essential Air Filtration Units. l l

INVESTIGAlICN N/A I l RESOLUfION OF PROBLEM !

l r~s Test agent injection and sampling manifolds shall be installed between the two

(_) carbon filter banks on each filtration unit. This will be accomplished in accordance with ECN R-0788.

lESTING The test agent injection manifolds shall be tasted in accordance with ANSI N510-liLO to demonstrate tnat the test agents are uniformly dispersed in the airstream entering :ne second bank of filters.

e b

a a ' O m

PRELIMINARY

SYSTEM PRCELEM 3 r'%

Excessive noise in the Control Room caused by operation of the Essential HVAC Syste..

t ) l TRACKING NUMSER: 19.C010.A PRIORITY: 1 SOURCE: Meeting minutes of HVAC Upgrade Meeting held 12/04/85 (J. Naleway/D.

Abbott to distribution, 12/09/85); Selected Projects: Interviews; BBN Laboratories Inc. Letters, 11/17/85 and 12/09/85 DESCRIP~lICN Operation of each train of essential HVAC equipment produces undesirable sound levels in the Control Room and impairs communication within the Control Room and while using the telechone. When both trains of ecuipment ocerate simultaneously, occurs during automatic actuation of the essential system, the sounc levels incresse and have a severe impact on communication.

INVESTIGATICU Ao evaluation of the noise and vibration levels of the essential HVAC System nas bass cerformed to estaclish the cause(s) of the hign noise levels. Based on the re>ut : of this evaluation, immediate and long term resolutions will be pursued!

NE50U.'110?] 0F PROBLEM e

k_ The followitg actions'will be taken to resolve the problem:

1. A special test will be performed to evaluate the effect of recuced air flow on system noise levels and cooling cacability.

2. :f :ne acove tes: cemonstra:es that reduced air flow will yield satisfactory reductions in system noise level while T.ain:sining ar, acce::able level of eccling and pressurication cacability, a ccification will be implemented.

3. If the above :es: demonstrates that reduced air ficw will not yield satisfactory results, Nuclear Engineering will provice an alternate resolution.

TESTING Upon completion of any modification to the essential system for noise abatement, the balance of the system shall be verified and corrected as required. The noise levels shall then be measured to determi.ne effectiveness of modification.

I r

x- .,

PRE.lMERY

SYSTEM PRCSLEM 4

-s Control Room /TSC Essential HVAC Systems (High Vibrations on Condensing Units)

Iw)\

TRACKING NUMBER: 19.C010.L PRIORITY : 2 SOURCE: Interviews: Meeting minutes of HVAC Upgrade Meeting held 12/04/95, (J. Naleway/D. Abbott to. distribution, 12/09/85); RRRB Action Plari 19.0010.L DESCRIPTICN Operation of either of the Essential HVAC Systems'causes a substantial vibration ir, the related condensing unit. This vibration has caused pipe straps to work loose j and fall off and could therefore impact the integrity of the refrigerant system if l pipe were to break.

INVESTIGATION Maintenance evaluated the vibration level of the CR/TSC Condensing Units in December \

1985 and found that one of the ecmpressors was missing a part which could affect the j alignment.

reduced vibration. The compressor and motor for both units were realigned which resultqd in Vibration levels on the condensing unit were monitored during an engineering

/~T evaluation run of the system.

'- '# for evaluation. The data has been forwarded to Nuclear Engineering RESCLUTION OF PRCELEM tiuclear Engineering will provide recommendations to resolve the p-chlem.

e n

,. _.,.,v Vibratien levels will be checked follcwing any T.cdifications intended'to recuce vibration.

k i's/! **

+'

PRELMNARY

SYSTEM PRCBLEM 5 Control Room Normal HVAC (Flew Switch)

(G N/

s TRACKING NUMBER: 26.0017 PRIORIlY: 2 SOURCE: Interviews; Meeting minutes of HVAC Upgrade Meeting held 12/04/85 (J. Naleway/D. Abbott to distribution, 12/09/85); SFR 280-85.

DESCRIPTION A paddle-type low flow switch was install'ed in the cold air supply duct to shut off the normal air handler upon actuation of the Essential HVAC System. During the colder periods of the year there is a smaller demand for cooling in the Control Room, such that the air flow through the cold duct is decreasec. This air reducth.

was enough to cause the ficw switen to trip and shutdown the normal air handler, resulting in a loss of normal cooling to the Control Room, After a short time, tha Control Room heats up and causes the Essential HVAC System to autcmatically actuate upon Control Room hign temperature.

INVESTIGATICN N/A I RESOLUTION OF PROBLEM -

(O) A design change has been initiated to relocate the low flow switch from the cold air cuct to the return air duct where a steady air flow exists, independent of the heating /ccoling load in the Cen:rol Recm. This enange is being imclemented under i

I ECN R-C314.

-tLo e l a.e J Star:uo testing of this mcdification will ce performed to verify proper opera:icn of

ne ficw suiten upon completion of the mcdification.

l e

m (w) .,

3-5

)RE.MERY

SYSTEM PROBLEM 6 Control Room /TSC Essential HVAC (Pressurization Measurement Access for TSC)

O IRACXING NUMBER 26.0006 PRIORITY: 2 SOURCE: Interviews; Technical Specification 4.10, STP-189 DESCRIPTION l

Technical Specification 4.10 requires that the Control Room /T3C Essential HVAC System have capability to pressurize the Control Room and TSC to 0.125 IWG (min.);

however, no pressure tao exists to measure the pressure in the TSC. Pressure ;

readings are presently taken by putting a tube under the door into the TSC.

INVESTIGATICN i

N/A :

I RESOLUTION OF PROBLEM -

Install permanent pressure taps through the TSC wall such that future pressure ,

measurements may be.made from a constant measuring point. It is recommanded th t one tap be placed through the north wall into the Auxiliary, Building main corridor and that a second tap be placed through the south wall into the NSEB Bridge so that l gg measurements may be taken will reference to both points.

(el l l

Permanent pressure taps will be installed in accordance with an ECN. 1 I

TESTING !

l l

e 0 m PRELMNW

i SYSTEM PROBLEM 7 !

The Control Room /TSC Essential HVAC System is subject to inadvertent actuations

() caused by spurious signals from the radiation monitors.

TRACXING NUMBER: 26.0154 PRIORllY: 1 l i

SOURCE: Interviews, Occurrence Description Report OESCRIP' LION I

'The radiation monitors were not grounded as recommended by the manufacturer of th. I equipment, such that output signal spikes are developed by the equipment causing th-Essential HVAC System to start inadvertently.

1 1

INVESlIGAlICN l

RESCLUTION OF PRCELEM The radiation monitors shall be grounded per the manufacturer's reccmmendation to prevent the spurious signal spikes and the resulting inadvertent actuations of the Essential HVAC System. This work is beir:g performed by ECN R-0132. '

In addition, the signal from the alert channel of the radiation monitors will be i l

modified such that it no longer sctuates the Essential HVAC System, but only l

(~/)

N-provides an alarm to alert the operators of increasing radiation levels. This '

change is being performed by ECN R-Ol64 TESTING Testing of these changes will be performed to verify the changes cause the radiatie .

cetectors to function as int er.c ed .

e

%-) .

PRELIMINARY

SYSTEM PROBLEM 8 Power supplies to Essential HVAC Units do not conform to ovrmal ergineering practice I")

\_/

for providing reliable power to the controls and instruments.

TRACKING NUMBER: 26.0153 PRIORITY: 2 SOURCE: Meeting Minutes of HVAC Upgrade Meeting; Project Proposal 86-018; Calc # Z-EDS-E0583 DESCRIPTION

1. The control power supply for the filtration units SF-A-7A and SF-A-73 (pcwer

~

supply units and Raymond actuators) are supplied from 120V distribution pane}<

which could have steady state voltage availability below that wnich is recommended for operation of the equipment.

2. The Class 2 instruments of the filtration and air handling units share the same pcwer supplies with the lighting and receptacles of the units. Th.is does not follow established practices for providing pcwer to instruments.

INVESTIGATICN .

I N/A

^

RESOLUTION OF PROBLEM m

1. The control power supply for the filtration units shall be relocated from the

~

12CV distribution panels SIA3 and S153 to the distribution panels SIA2-1 and S1B2-1 supplied by inverters S1A2 and S192 whien have enougn cacacity to supply the equipment as recommer.ced.

2. c The illuminating lights for the essential air handlers and filtration units will be previoed with a new control pcwer supply such :na: suitening transients in the lighting circuits do not interfere with :ne instruments.

This work is being acccmplished by ECN R-0796.

TESTING To-be determined.

o

(-)

~~/ .,

'~'

PREllMINARY

SYSTEM PROBLEM 9 rhe refrigeration system arrangement does not acccmmodate convenient or eff cient b'3 maintenance of the system.

TRACKING NUMSER: 26.0152 PRIORITY: 1 SOURCE: Interviews with Maintenance personnel.

DESCRIPTION The arrangement of the refrigeration system components does not facilitate maintenance of the system due to:

1. insufficient isolation capability,

2. difficult access to' components,

3. extreme difficulty in removing major components for repair or replacement.

INVESTIGATICN N/A RESOLUTION OF PROBLEM '

P

(,_) 1.

Provide equipment (monorails and hoists, etc.) for removing and reinstalling the compressor, compressor motor, and other major components. This action will also require slight modifications to the condensing unit to accommecate relocating obstructions of compressor removal.

2.

Isolation valves shall be provided as repuired to facilitate isolation of the ecmponents for removal for repair ar.d calibration pur;cses eithee: releasing tne refrigerant enarge.

3.

Relocate the lipuid line sightglass so that it is mere accessible for :eriedic monitoring.

TESTING Testing will be performed as necessary following completion of modifications to verify preper function.

4 i

PR$LIMINAR i

t i

SYSTEM PROBLEM 10 Flow transmitter _ current loop impedance causes transmitter output to be out of O(~T tolerance low between 75 a.c ICC% of full range.

TRACXING NUMSER:

PRIORITY: 1 SOURCE: NCR S-5863 DESCRIPTION A current loop is used to generate the flow transmitter output signal. Excess impedance. in the current loop prevents the development of-full output voltage, thereby limiting the transmitter at the hi end of the output range.

INVES1IGATION N/A

~

RESOLUTION OF PROBLEM The problem will be corrected in accordance with the disposition of NCR S-5863. g FESTING To be determined.

o o

e 0

,.1, PRELIMNARY

SYSTEM PROBLEM 11 The quantity of refrigerant in the CR/TSC Essential Air refrigeration system is

{} difficult to determine during maintenance and systa- troubleshooting.-

TRACKING NUMBER:

PRIORIT Y : 1 SOURCE: Interview with maintenance personnel DESCRIP1 ION The quantity of refrigerant charge present in the CR/TSC Essential Air refrigerant system is difficult to determine without a receiver site glass.

INVESTIGATION T:one RESOLUTION OF PROBLEM Nuclear Engineering will provice a resolution for this problem.

TESTING I To be determined .

O k.)

l e

0

+11 PREUM NARY

SYSTEM PROBLEM 12 (N Cooling capability .of the CR/TSC Essential Air Syst am is marginal during cold V waather operation.

TRACKING NUMBER: 26.0015 PRIORITY: 1 SOURCE: RRRB Action Item 19.0010C DESCRIPT ION The controls of the refrigeration portion of the HVAC system do not permit reasonable flexibility of the system to respond to all variations in cooling loads with respect to ambient conditions. During low ambient conditions, the system fail to maintain adequate pressure in the suction line resulting in compressor trips.

The consequence of this condition is that the essential HVAC system cannot be relief upon to operate under all postulated accident modes.

INVESTIGATION ~

RESOLUTION OF PROBLEM i

A modification was performed in September 1985 (Reference ECN R-0142) which opened a flow path for refrigerant under low load conditions by opening a solenoid valve 7 ,which.had been controlled to close at low load. Subsequent surveillance testing

(,)vsrified that the system was working satisfactorily.

Revise the controls for the condenser fans to allow cycling of two cf the three fans in response to ambient temperatures. This will provide improved responsiveness of the condensing capacity to cooling Icad with regard to ambien conditiens. 'Tnis change is being imolemented by EIN R-0759 TESTING !

Testing will be performed upon completion of modificatiens to verify that the refrigerant system functicns properly.

1 j

1 l

l l

e

(/

-1I

-)REllMlNARY

~

l

.. ~

l SYSTEM PROBLEM 13 l

(~

(,g) Control Room /TSC Essential HVAC System (Refrigeration Problems)

TRACXING NUMBER: 26.C013 PRIORITY: 1 SOURCE: Meeting minutes of HVAC Upgrade Meeting held 12/04/85 (J. Naleway/

0. Abbott to distribution, 12/09/85); RRR8 Action Item 19.001CC ac.;

19.0010.J; NCR S-5028 CESCRIPTION 1

Refrigeration System modifications are necessary to improve performance of the system and to facilitate efficient and effective maintenance.

INVESTIGATION RESOLUTION OF PROBLEM

1. Provide a system pumpdown capability to return refrigerant to the receiver when the system is snut dcwn, i his change will prevent damage to the I

compressor and enable more reliable. startup of the system. j

2. Provide hot gas bypass controls to prevent feeding hot gas thru an inactive evaporator coil.

(O ;

3 .

Develop a new P&ID to graphically represent the CR/TSC Essential Air refrigeration system.

l 4

Modify the evaporator control secuence to provide closer incremented control. 1 l

TESTING Testing will be performed u:en completion of.the modifications to verify that the refrigerant systems function properly. l e

o- - PRLMMRY 3-13

SYSTEM PROBLEM 14 Work on fire dampers between the Control Room and TSC (currently deferred under McG rS111) is not complete.

V TRACKING NUMSER: 19.0011.A PRIORITY: 2 SOURCE: RRR8 Action Item 19.0011.A DESCRIPTION Eight existing dampers are to be modified and two new dampers are to be installed.

Long term operation with compensatory. measures is not desirable. The ability to complete this work prior to.startup must be evaluated.

INVESTIGATICN The ability to complete the work before startue will be evaluated. If there is a reasonacle possibility that the work can to completed in a timely manner, the.wcrk will be undertaken.

RESOLUTICN CF PROBLEM '

)

The eight fire dampers through the east wall of the control are being upgraded from 1-1/2 hour-rated dampers to 3-hour UL-rated dampers by ECN R-0763. lhe supply and return ducts for the Essential HVAC System through the TSC Roof will be equipped

(,,')withUL-ratedfiredampersandsmokedamperstopreventsmokeinfiltrationfromthe

'~ TSC to the Control Room through the Essential System ductwork.

TESTING verification of the procer coeration of the fire ar.d smoke dameers will be ;erformed upon ecmpletion of tne modificaticns. The fire dampers will then be tested periodically by Surveillance Procedure SP.201.03M.

o PEggay

SYSTEM PROBLEM 15 m

() The CR/TSC Essential Air Conditioning System is subject to spurious actuations caused by high temperature in certain areas of the Control Room.

TRACKING NUMBER: 26.0018 PRIORI 1Y:

SOURCE: Occurrence Description Report; September 7, 1985 DESCRIPTION Temperature sensors which actuate the CR/TSC Essentia.1 Air System in the event of high Control Room temperature (80*F) are located approximately eight feet above the floor in the vicinity of computer equipment. Temperature in this area is somewhat j elevated relative to the average temperature in the Control Room. Spurious system actuation is caused by high temperatures in the vicinity of the sensors _rather than excessive average temperature in the Control Room.

INVESTIGATION The temperature at various point throughout the Control Room and Computer Room will l be measured HVAC to determine System operating. the temperature gradient at these point with the norm The temperature at the sensors for the Essential HVAC System will be compared to the overall distribution to determine if a trend exists that would cause the sensor to be subjected to temperatures higher than the average s

overall temperature resulting in spurious actuation.

RESOLUTION OF PROBLEM A change in the setpoint cf the temperature controllers will be considered if it can be shown that a higher se::oint will still provide for a maximum temperature of 80'F in the general area as recuired by the oesign basis of the Essential HVAC System .

In addition, the Normal HVAC System will be rebalanced to ensure tnat tne air distribution is adecuate to provide cooling to all areas within the Centrol Room and Compu:er Hoom.

TESTING Ealancing of the No-mal HVAC will be perfonned by an STP followed by a cetermir.ation of a Control Room emoerature profile.

o 3-15 -

PRE.>MNA.

t....

h..:-v..U55b~.2s.

SYSTEM PROBLEM 16 Control Room Norinal HVAC System (Air Flow Balance)

TRACKING NUMBER: 26.0011 PRIORITY: 2 SOURCE:

Interviews, Calculation Z-HVS-M0282, NCR S-5663 DESCRIPTION The air balance of the Control Room Nortnal HVAC System has not been updated or verified since the original balancing was performed in le73, despite several modifications which could affect the balance or the heat load. As a result, the HVAC equipment may not be satisfying the current loading in the Control Room.

INVESTIGATION Temperature Control data(Work Room area will be obtained Request to enable evaluation of cooling throughout the Number 115248). _

RESOLUTION OF PROBLEM 1.

vibration testing of all rotating equipment. Initiate complete air flow b O 2. ae;# t ne<=r reatac (i.e., sheaves, 1 t co aenent a re=#ir e to ==aaert air balance already begun. belts, bearings, and thermal overload heaters). This work has 3.

Conduct a system review of the system design after the rebalance of the system verify that system performance optimizes Control Room environmental conditions consicering all the presently identified loads.

TESTING Testing will be performed as retuired to verify the balance of tne system is acetuate for cooling in the Control Room (i.e., temperature profiles will be taken at various locations in the Control Room and Computer Room).

o PREUMINARY 3-16 '

SYSTEM PROBLEM 17 The CR/TSC Essential Air Conditioning System is subject to spurious actuations caused by the Chlorine Gas Detector.

TRACKING NUMBER: 26.0025 PRIORITY: 1 SOURCE:

Occurrence Description Report. 06-30-86, WR# 116218, Interviews DESCRIPTION The chlorine gas sensor contains an electrolytic fluid which must be replenished periodically.

Depletion of this fluid causes the detector to actuate.

Replenishment of this fluid should be accomplished in conjunction with other preventive maintenance items on a periodic basis.

INVESTIGATION RESOLUTION OF PROBLEM -

l I

A procedure be written. for performing periodic maintenance on the chlorine gas detectors will !

l TESTING To be determined.

1 o -

PRELMNARY 3-17 3 r

, t, .

l

~

- _j

l 1

SYSTEM PROBLEM 18

" Infiltration occurring. through the CR/TSC Essential Air Handler ( AH-A-545A) access door is TRACKING NUMBER: 26.0008 PRIORITY: 1 SOURCE:

Occurrence Description Report, 06-30-86, Work Request Number 116217 DESCRIPTION

)

Air leakage into the CR/TSC Essential . Air Handler "A" been detected. with the system operating has in unaccounted infiltration of unfiltered air.This is a breach of the Control Room /TSC INVESTIGATION i

N/A RESOLUTION OF PROBLEM The access door gasket will be replaced and torquing of the retaining nu verified.

() The bolt-on access doors will be replaced with marine bulkhead type doors as recommended by ANSI N509-80 and ERDA 76-21.

the units for maintenance as well as a leak tight joint.~lhis will facilitate easy access into '

TES1ING

1 The new access doors will be tested for leakage in accordance with ANSI N510-80 .

l o

PREUMINARY

,,a-

[3 r.

,a- -

rrr:.

, _. e - .

e q.-

SYSTEM PROBLEM 19

() Isolation Dampers not operating properly.

TRACKING NUMBER: 26.0004 PRIORITY: 1 SOURCE:

Interviews; NCR S-5611; STP-194; Troubleshooting Action Plan I.R.1 DESCRIPTION:

Control Room position and may isolation dampers have experienced difficulty in reaching full-close be leaking.

making maintenance of these dampers very difficult. Access doors were not installed near INVESTIGATION Investigation of proper damper position and proper position indication in actuated and unactuated dates is presently being performed in accordance with Work Request Numbers 114662 and 114663.

RESOLUTION OF PROBLEM

1. .

Initiate and implement a design change to add access doors where necessary for inspecting and maintaining the dampers.

() 2.

Evaluate the dampers to verify that they are installed in accordance with the manufacturer's instructions. Contact supplier to verify that the installation is proper.

3. I Review their and update preventive maintenance recuirements for the campers and components.

4.

Develop and implement procedures for periodic maintenance en isolation dampers.

TEST.NG Proper be function verified of the dampers by performance and associated IDADS damper position indication will of an STP.

o PRL.MINARY 3-19 m-.r. . . . . . - .

t

, f i~ . l ~ '..

e <. a .e .

SYSTEM PROBLEM 20

/~'}

~ Control Room Toilet Area Exhaust Fan Isolation Damper A (HV-54727) is not positioning proper. properly when actuated and/or damper position displayed by IDADS is not TRACKING NUMBER: 26.0002 PRIORI 1Y: 1 SOURCE:

Selected Projects, STP-194 data, Troubleshooting Action Plan I.R.1 DESCHIPTION During performance of STP-194 (CR/TSC Essential Air Conditioning Safety Features Operation and Flow Detection lest), HV-54727 was indicated by IDADS to be in both open and closed positions simultaneously when the system was operated in the ,

ventilation (high temperature / radiation) mode. '

INVESTIGATION This problem was investigated under Work Request Numbers 111572 and 114655 ~The damper actuator was determined to be malfunctioning. Operation .

investigated in accordance with Work Request Number 115170. of the accuator was l

to be functioning damper. properly but did not produce sufficient torque to close theThe actuator NCR S-5611 was written.

(]} RESOLU1 ION OF PROBLEM 1 Investigation of the discrepancy is to continue until a root cause is identified the camper functions properly and consistently. and ,

TESTING j will be verified by perfort.ance of an STP. Proper fune: ion ofcation the camper ProperCIA.

SP.211. function of the damper will be periodically checked by performance of i

l m

U PRELMNARY

,, ' ~

3-20

'3. . g - .; ry,~ .

[ ei h (*;;

,....a.-,

" " b d e m e t' #..

SYSTEM PROBLEM 21

() Shift Supervisor Office Exhaust Fan Isolation Damper B (HV-54732) is not positio properly when actuated and/or damper position displayed by IDADS is not proper .

TRACKING NUMBER: 26.0003 PRIORITY: 1 SOURCE:

Selected Projects, STP-194 data, Troubleshooting Action Plan I.R.1; RRRB Action Item 19.00

10.8 DESCRIPTION

During performance of STP-194 (CR/TSC Essential Air Conditioning Safety Features Operation and Flow Detection Test), HV-54732 was indicated by IDhDS to be in both open and closed positions simultaneously when the system was operated in the ventilation (high temperature / radiation) mode.

INVESTIGATION This problem was investigated in accordance with Work Request Numbers 114657.

1he damper was found to function properly. The damper position 114656 and limit switches, whichintermittently.

to be operating are the source for the IDADS damper position indication, were f und l '

The limit switches were adjusted. 9 of damper position was subsequently checked and found to be proper. IDADS indication

() RESOLUTION OF PROBLEM Limit switches were adjusted.

checked and found to be proper, Damper function and damner position indication was TESTING s l

Proper indicationpest willmaintenance be verified byfunction of thisofdanner performance STP. and the IDADS damper position Preser function of this damner will be periodically checked by performance of Surveillance Procedure SP.211.010.

g .

3RRWNARY 3-21 . . . . . . _ ,

-.-.1

l i

l SYSTEM PROBLEM 22 Control Room pressure is not maintained at or above 0.125 IWG relative toe outsid atmosphere by operation of either CN/1SC Essential Air System train.

TRACKING NUMBER: 26.0006 PRIORI 1Y: 1 SOURCE:

Interviews with STP-189 Coordin ttor DESCRIP1 ION CR/TSC pressure could not be maintained sbove 0.125 IW ,

atmosphere by operation of either CR/TSC Essential Air train.

INVESTIGATION The following checks of the CR/TSC Essential Air System dampers will be comple n accordance with Work Request Numbers 114662, 114663, 111572, and 114655: -

1.

Visual check of damper blade position in actuated and unactuated states 2.

IDADS indication of actuated and unactuated damper positions.

An investigation performed under WRof#115773 the Control Room /TSC boundary walls, floors and ceili ngs was located. to identify any breached openings, however none were i

RESOLU1 ION OF PROBLEM I i

Complete investigation of dammers and affect repairs, as recuired .

TESTING Upon completion, perform STP-129 to verify the Control Room /TSC is press least Air C.125 System IWG relative to outsica atmosphere by operation train. urized to at CR/

of each SD 211.01B and SP 211.010 proper. will be pe formed to verify pressurization and flow are !

~.

o PRE.MNARY 3-22 U l

-...p,. .

'A. ::c, .ha ;

SYSTEM PROBLEM 23

'\

q) piping and control problems. Operation of the CR/TSC Essential Air Refrigerant e rtain S TRACKING NUMBER: 26.0014 PRIORITY: 1 SOURCE: Interviews: System Engineer DESCRIPTION 1.

A leak in the CR/TSC Essential Air Train A refrigerant piping is suspected .

2.

A pressure regulator in the CR/TSC Essential Air Train A refrigerant system is subject to short cycling resulting in continuous surging.

3.

Evaporator coil superheat should be checkcd and adjusted.

INVESTIGATION RESOLUTION OF PROBLEM l

Troubleshooting aforementioned and maintenance as necessary will be performed to resolve the discrepancies.

A Maintenance Procedure will be initiation to describe the steps necessary to accomplish replacement of various refrigerant system components and to charge system with refrigerant.

TES1ING aProper function of functional post maintenance the refrigeration test. system will be verified following resoluti on by o ?REJMNARY 3-23 ~ ~ ' ' '

. . m ' .. . . . .: . . . . . -

SYSTEM PROBLEM 24

() The Control Room does not appear to be uniformly coo 3ed by operation of the Essential Air System.

TRACKING NUMBER: 26.0012 PRIOR 11Y: 1 SOURCE: PAG DESCRIPTION Air distribution is not believed into the Control Room with the CR/TSC Essential Air System operating be adequate. This problem may be compounded by duct / diffuser modifications for noise reduction.

INVESTIGATION Data system.

for evaluating the cooling capability was obtained by running each train of the Each train was operated for several hours; the B train on 07--19-86, the A train on 07-20-86. The Control Room was adequately cooled by the operation of each train; however, and unloading, temperature fluctuations were experienced during compressor loading j

RESOLUTION OF PROBLEM O The capability of each essential train to provide tr.iform cooling throughout the I

Control Hoom/TCS has been demonstrated, evaluation runs will be reviewed and recommendations implemented.remperatureCooling in the fluc vicinity of the Bailey computer cabinet will also be improved. i TESTING The essential and/or trains will be operated to obtain data for evaluation of any changes adjustments.

N g PREpMERY 3-24 . . .

.. ton ,;,_a t. }

...t

SYSTEM PROBLEM 25

() Air flow through the Essential Air Filtration Units may exceed the maximum rates actuated. in Technical Specification 4.10 for several minutes after the systems are specified TRACKING NUMBER: 26.0010 PRIORIT Y: 1 SOURCE:

STP-198 19.0010.8 data; Troubleshooting Action Plan I.R.1; RRR8 Action Item DESCRIPTION Booster fan inlet vanes, which control flow through the Essential Filtration Units are filterpositioned banks. in response to differential pressure developed across the carbon inletto vanes rate are opened to the maximum position thereby be established. allowi l

stabilized flow rate is established.This condition persists for several minutes until n' i

INVESTIGATION N/A -

)

i RESOLUTION'OF PROBLEM O !

The Essential necessary Filtration to establish Unit Flow stabilizec flow,controls will be adjusted to reduce the time

}

TESTING j Upon completion determined for eachof adjustments, time required to establish stabilized flowe will b train.

l O

PRELIMINARY 3-25 . . .

=

. 32 L Y -, . . f l' ; ." ; . '.. . k L .

SYSTEM PROBLEM 26

()' There is no approved procedure for calibration of the CR/TSC Essential Filtration Unit Flow Iransmitter.

TRACKING NUMBER: 26.0009 PRIORITY: 1 SOURCE:

RRRB Action Item 19.0010.B DESCRIP1 ION Differential pressure across the carbon f',1ter banks is the parameter measured to control flow thru the Essential Filtration Units. The flow characteristics are i i

subject to change when the carbon is chtaged, necessitating recalibration of the flow transmitter of flow to assure rate is indicated the proper flow rate is maintained and proper indication in IDADS.

INVESTIGATION N/A I

l RESOLUTION OF PROBLEM '

i fs A procedure for calibration of Essential Filtration Unit flow transmitte rs instituted. will be

(_),

TESTING i N/A !

l l

1 l

l O

PRELMNAR'!

3-26 -

. 4 - -

.v-s...si..

2. T.L; e

SYSTEM PROBLEM 27 CR/TSC Essential Filtration Unit A Flow Transmitter (FT-54701) and/o components:

1.

Operate intermittently and/or provide intermittent flow indication on the IDADS monitor.

2.

Control flow at a rate which is in excess of the Technical Specification 4 10 .

flow limit and/or Specification indicate 4.10 flow limit. a flow rate which is in excess of the Techni TRACKING NUMBER: 26.0005 PRIORITY: 1 SOURCE: December 26, 1985 plant transient data, STP-194 (CR/TSC Essential Air Conditioning Safety Features Operation and Flow Detection Test);

Troubleshooting Action Plan I.R.1; RRRB Action Item 19.0010.8.

DESCRIPTION Flow control and indication of the filter unit is accomplished by a Foxboro Transmitter which monitors the pressure differential across the carbon filters and converts in the unitthis and into inputsantoelectrical the IDADS signal, which controls the. booster fan inlet vanes computer.

signal in an equation and displays the flow rate in efm.The computer then processes this During performance of STP-194, IDADS indication of flow through the Essential Filtration Technical Unit A (SF-A-7A)

Specification 4.10 maximumwas intermittent and indicated flow limit. ee flow rate be 3010 CFM; within Tech Spec 4.10 Limitations. Actual flow rate was determined to INVESTIGATION Tnis prcblem is being investigated in accordance with STF-198 (CR/TSC E Filtration Unit Flow Test) and Work Retuest Numners 114558, 115707.

ssential Air Function Request of Flow Number Transmitter 114658 FT54701 was investigated in accordanceorkwith W 04767.

cause for intermittent IDADS flow indication inte*~ ittent IDADS indication is continuing in accordance with Work Retuest Investigation was ofnot ide A

115707.

o PREUM ERY 3-27 ,r yfj 7 7 {

, 4 o: i {. .p: y : ;- .

E'ab d)Sb i. . . / .

SYSTEM PROBLEM 27 (Continued)

CR/T'SC Essential Filtration Unit A Flow Transmitter (FT-54701) components:

RESOLUTION OF PROBLEM Flow through the CR/TSC Essential Filtration Unit A (SF-A-7A), based upon measurements made by performing STP-198, outside air and 1,507 cfm return air. is 3,010 cfm consisting of 1,507 cfm IDADS during the test was 3,540 cfm. Flow through the filtration unit indicated by 530 cfm greater than the actual flow rate.10 ADS indicated flow rate through SF-A-7A was The computer equation used to calculate the indicated flow rate will be revised to provide a more accurate IDADS indication of actual flow rate.

TESTING 1Continuous and accurate rain A will be verified by performanceIDADS of anindication STP, of air flow thru the CR/TS 1

. I o

l i

o PRELM WRY 4-28

.4

L.._.~,.,'l.. .

SYSTEM PROBLEM 28 CR/TSC Essential Filtration Unit B Flow Transmitter (FT-54702) an components control flow at a rate which is in excess of the lechnical Specification 4.10 flow limit Specification 4.10and/or indicate a flow rate which is in excess flow limit. c nof cal the Te h TRACKING NUMBER: 26.0007 PRIORITY: 1 SOURCE:

December 26, 1985 plant transient data, STP-194 (CR/TSC Essential Air Conditioning Safety Features Operation and Flow Detection Test);

Troubleshooting Action Plan I.R.1; RRR8 Action Plan 19.0010.B.

DESCRIPTION Flow control and indication of the filter unit is accomplished by a Foxboro Transmitter which monitors the different.a1 pressure across the carbon filter and and inputs to the IDADS computer. converts this into an electrical signal, which con equation which indicates flow rate in efm.The computer then processes this signal into an During performance of STP-194, IDADS indication of flow through the Essential Filtration Unit B (SF-A-78) exceeded Technical Specification 4.10 maximum flow l limit.

O Actual flow rate was determined to be 3050 CFM; within Tech Spec.10 INVESTIGATION 4 limits.

This problem Filtration is being Unit Flow rest) andinvestigated Work Hequest in Number accordance with STP-198 (CR/TSCr Essen 115709.

RESOLUTION OF PROBLEM Tlow through the CR/TSC Essential Filtration Unit B (SF-A-78), based upon measurements ma e by performing STP-198, air and 1,725 cfm outside air. is 3,050 cfm consisting of 1,228 cfm rsturn Flow indicated by DADS during STP-198 was 3,793.

DADS indicated flow rate through SF-A-78 is 748 cfm greater tnan ictual flow rate .

Return air and outside air flow rates will be adjusted to 1600 CFM 210% . The p~avide a more accurate IDADS indication of actual flow rate. com Balancing Work Requestof outside Number and 114691. return air flow will be accomplished in accordance with LISTING '

Proper with air flow rate and IDADS indicated flow rate will be verified in accordance STP-198.

O PRELMNARY c . . - .

u> g. a i r L -Q . .

1

SYSTEM PROBLEM 29 Operating CR/TSC Procedure Essential A.14 does not include adequate instructions for operation of the Air System.

TRACKING NUMBER: 19.0010.D PRIORITY: 1 SOURCE:

Operator Interviews; Troubleshooting Action Plan I.R, RRRB Action Item 19.0010.0 DESCRIP1 ION Operating Procedure A.14 is deficient in the following areas:

1.

ihe difference is configuration between Train A and Train B in the present Interim Number 2 not clear.

2.

The limitations imposed on the system when in the isolation /stop mode are not delineated.

3.

Criteria for stopping operation of the individual trains after automatic actuation is not included. .

j 4.

Interaction with the Nuclear Service Electrical Bus Unloading Scheme is not

(} discussed.

5.

Instructions for placing system in STANDBY are not complete.

INVESTIGA1 ION N/R RESOLUTION OF PROSLEM Operating Procedure A.14 and related procedures will be revised.

TESTING N/A l

l 0

?RELMINARY 5-30 , . r:. ~ tr--~,-

b

,. . s .

. ~b k.*. *. 1..h.,.. W'

~

SYSTEM PROBLEM 30 s

('/) Surveillance limit Procedures SP.211.01A and SP.211.01D do not provide a check of all

\~

damper switch position indications.

position indication problems may be masked.As a result, damper position and/or 1 RACKING NUMBER: 26.0023 PRIORITY: 1 SOURCE:

Troubleshooting Action Plan I.R.1: STP-194 OESCRIPTION There are System four damper position IDADS indications for each CR/TSC Essential Air damper.

pertinent surveillance enclosures.However, only two of the four positions are recognized on indications are not detected. As a. consequence, conflicting damper position INVESTIGATION N/A RESOLUTION OF PROBLEM I

Surveillance four positionProcedures indications.SP.211.01A and SP.211.010will be revised to recognize th e

A newrefueling each Surveillance Procedure will be initiated to verify proper damper functi interval. on once TESTING N/A O

3-31 PREllMNARY

v. - -~ .. . , . . 7.

p- .m 6 t.-.; .# .. .. .

1 I . _ _.

SYSTEM PROBLEM 31 Approved procedures for accomplishing non-routine complex refrigeration maintenance ta:sks do not exist. system TRACXING NUMBER: 26.0024 PRIORI 1Y: 2 SOURCE:

Interviews with HVAC Maintenance personnel DESCRIPTION A Maintenance Procedure describing refrigerant system pumpdown recharging, and compressor change out is needed. , evacuation, of required special equipment, materials, etc. The procedure must include a list RESOLUTION OF PROBLEM A Maintenance Procedure for accomplishing these tasks will be written .

INVESTIGATION .

N/A TESTING I O n'a o PREUMNARY l

SYSTEM PROBLEM 32 0) s_

Operation Operators. and control of the CR/TSC Essential Air System is not understood by TRACKING NUMBER: 26.0021 PRIORITY: 1 SOURCE:

Operator interviews; Troubleshooting Action Plan I.R.2.

DESCRIPTION Additional Air training Conditioning is necessary System to enhance Operator knowledge of CR/TSC Essential operation.

system operating modes, Clarification of backup power sources, various system interfaces is necessary. system availability in the various operating modes, and INVESTIGATION N/A RESOLUTION OF PROBLEM i

Essential Air Conditioning System. Additional training will be provided to imp Topics to be presented include:

1.

Any differences between CR/TSC Essential Air Train A and Train B .

2.

Clarification of backup power sources for the system.

3. Various system operating modes.

4.

System availability in the various operating moce.

5. System interfaces.

1ESTCN3 N/A i

o ?REllMINMY -

3-33 7-e. . r : r:

i. ' ' , . *

.; '. . . .6 : . . i . . . . .

SYSTEM PROBLEM 33

() The "hardcast" tape used to seal the Essential Air Handling Units against air infiltrationenvironmental expected has not beenconditions.

documented as being qualified for long term e xposure to TRACKING NUMBER: 26.0150 PRIORITY: 1 SOURCE: System Design Engineer DESCRIPTION During the startup testing of the Essential HVAC System, air handling units could not meet the leakage criteria of ANSI N509-1980 due to inadequate design and fabricatior, of the unit housin3 manufacturer of the tape. seal all of the joints of the housing based on assura Upon evaluation of the qualification information available, a qualifieditlife was of determined the tape. that there was insufficient data available to establish INVESTIGAlION !

available information from the manufacturer of theed tape

() provide a qualified components life of the material due to the proprietary nature of the of the tape.

RESOLUTION OF PROBLEM air handlers to verify :naA procedure will be developed for periodic inspection e application on the o inspection will be performed in conjunction with c;her testing r ormed on The to be the units as a result of c:ner modifications.

The tape life expected shall of be thesubmitted material. for environmental cualification to cetermi ne the TESTING handler access coers (kef:A housing leak test which will be performed e air following cf the taped jcints of the unit. Tracking Nammer 25.0002) will also verify the integrity 0

s-34 PRELMNARY t '

I

- - . ;' t . r , ,

\

O % s Wa.[j'.b

. ;AI

_ _ J

SYSTEM PROBLEM 34

() Carbon filter tray mounting in the CR/TSC Essential ' Air Filtration Unit must be evaluated for appropriate filter mounting capability.

TRACKING NUMBER: 19.0011.0 PRIORITY: 2 SOURCE:

RRRB Action Item 19.0011.0' DESCRIPTION The carbon activities. filter tray mounting frames may be improved to facilitate maintenance INVESTIGATION A study improvements.

evaluate of the carbon filter tray mounting frames will be performed to identify and RESOLUTION OF PROBLEM Later i

TESTING

() In-place filter testing will continue to be performed by the existing Surveillance Procedures Spee limits. to verify that bypass leakage past the filter frames does not exceed Tech :

O 3-15 PREllMINARY i . ,7; , . 3' ., .k ..~.-o.; . _ . ,

SYSTEM PROBLEM 35

() Freon leak in Essential Air Handler.

TRACKING NUMBER: 26.0151 PRIORITY: 1 SOURCE:

Interviews with Human Factors Group OESCRIPlION INVESTIGATION An informal in estigation of the effects of Freon 22 on habitability has indicated that the Freon in its gaseous form would act as an asphyxiant by displacing oxyge in the Control endanger Room. however, a very high concentration of Freon is required to habitability.

In addition, discussions with other plants having a similar subsequent actions (i.e., revealed that were analyses were performed, it was found no type of HVAC system has required. installation of Freon Detection Systems, etc.) were RESOLUTION OF PROBLEM A study will be performed to document the effect of a Freon leak on Control Room i !

habitability based on the quantity of Freon available in the system. i

() TESTING j

i N/A 1

l l

l 1

o ?RELMINARY 3-36 . , . .

i , ;

**M; ' : . .y

- - - ~ . __

SYSTEM PROBLEM 36

() Control Room /TSC Essential HVAC System (Diesel Exhaust into HVAC Intake)

TRACKING NUMBER: 19.0010.G PRIORITY: 2 SOURCE:

Meeting minutes of HVAC Upgrade Meeting held 12/04/85 (J. Naleway/

D. Abbott to distribution, 12/09/8S); ODR No.85-154 OESCRIPTION During certain weather conditions, the exhaust of the existing diesel generators is dispersed over the Auxiliary Building roof area, including the Control Room /TSC Essential HVAC Unit outside air intakes. Concurrent operation of the diesel generators and the HVAC System could result in deterioration of the carbon absorbent material in the filter banks due to exhaust fumes being drawn into the unit.

INVESTIGATION An evaluation of the filtration unit outside air intake locations relative to the diesel exhaust stacks was performed and it was determined that there would be sufficient diffusion of the products of combustion in the exhaust stream with the air intakes. air to avoid the problem of concentrated exhaust being drawn into the surrounding efficiency wasInnotaddition, a carbon sample was tested and the reduction in significant,

() therefore, has a small impact on the efficiency of the carbon filters.it was concluded that the diesel RESOLUlION OF PROBLEM Perform have a study on the carbontofilters.

determine what possible long term effects the diescl exhaust m TESTING The refueling interval and 720 elapsed operating time surveillance precedures will continue to sample tne caroon suen tr.at any cegracation will be cetectac.

. i i

)

o 3-37 PREUMlWRY '

~'"'~Y~~~ l

.p

1

~

\

l SYSTEM PROBLEM 37 The affect radiation of CR/TSC exposure Essential levels Filtration Unit initial air flow rates on CR/TSC is not known.

TRACKING NUMBER: 26.0020 PRIORITY: 1 1

SOURCE: USNRC concern '

DESCRIPTION Upon system actuation, air flow rates thru the CR/TSC Essential Air Filtration units exceed the stabilized flow rates for several minutes. During this period, the concentration levels of airborne radioactive particulate and or gas is assumed to be at maximum levels. 1he combination of the flow rates and concentration levels may result in increased CR/TSC occupant exposure levels.

INVESTIGATION A study to evaluate the affect of CR/TSC Essential Filtration Unit hi flow rates and hi radiation concentration levels on CR/TSC occupant exposure levels will be completed.

j RESOLU1 ION OF PROBLEM The flow controllers which actuate the fan inlet valves on the filter unit booster fan will be adjusted to minimize the time required to stabilize the air flow through the unit.

TESTING To be determined, l

i o

3-38 PRRIMINAR '

r---.......-_..

-.a....... . . . 6

SYSTEM PROBLEM 38

() Automatic initiation of CR/TSC Essential Air System operation increases Control Room Operator work load during certain critical plant operating phases.

TRACKING NUMBER: 26.0019 PRIORIT Y: 1 SOURCE: Troubleshooting Action Plan IR DESCRIPTION Both trains started upon of Safety the CR/TSC Essential Features Air Conditioning System are automatically initiation. The Control Room Operator must direct attention to this system, decide which train to shutdown, then take action. This is believed to be an critical phases ofunnecessary plant operation.contribution to Control Room Operator workload during INVESTIGATION A study will be performed to determine the necessity to start both trains of the CR/TSC Essential Air Conditioning System upon Safety Features initiation.

following will be considered. The I

1.

Automatic Safety start ofinitiation.

Features only one CR/TSC Essential Air train in the event of a

\q m- Automatic start capability of the second train would be removed.

2.

Staging of trains to automatically start only one CR/TSO Essential Air train upon Safety Features initiation. The second train would automatically start only if the first train failed to star; or coerate.

3.

Removal from of Features.

Safety the CR/TSC Essential Air System automatic start capability Safety Features actuation.Neitner train would be automatically started by The nature cf capabilities modifications will necessary to facilitate any of the aforementiened also be considered.

the controls will not be acceptable. Modifications which and undue complexity to RESOLU'l!ON CF PROBLEM Nuclear Engineering to determine a resolution.

IESTING 1

To be determined.

Cl)

PRE.lM NARY

,_,, - r r s c : . . . -- -

.....ee **

SYSTEM PROBLEM 39 Control Room /TSC Essential HVAC (Controls and operating status indication in the Control Room.)

TRACKING NUMBER: 26.0022 PRIORITY: 1 SOURCE:

Meeting minutes of HVAC Upgrade Meeting held 12/04/05 (J. Naleway/

D. Abbott to distribution, 12/09/85); RRR8 Action Item 19.0010E and 19.OO11G OESCRIPT ION The manual control and indication switch for the Control Room /TSC Essential HVAC System only provides limited information regarding the operation of the essential equipment.

It does not have the capability to distinguish between SFAS, high radiation, or a single light.

Control Room high temperature starts since all three are indicated by No indication is provided for the status of the compressor.

Therefore, to verify operating status of the essential equipment, the operator must either check the remote local indication or review the output of IDADS. 1 INVES1IGAlION i

N/A '

RESOLUTION OF PROBLEM 1.

Revise the ocerating procedure to provide instructien to distinguish between the actuating signals prior to isolating both units.

2.

S.e contrci switch for One Essential HVAC System should be modified to provide an indication of the signal wnich caused the system to actuate.

3.

An indication for the ocerating status of the compressors will be acoed in the Control Hoom, either near the control switch for the system er in tne IDACS commuter.

4.

Evaluate the Essential HVA0 System to determine what cther system operation indications should be c.ade available in the Control Room.

g PREl.MINARY 3--40

{ ~ M: P." r ty a a .

r. . >

9 SYSTEM PROBLEM 40

(~}

Temperature in the Essential Unit compressor compartments may become excessive during hot weather operation.

TRACKING NUMBER: 26.0015 PRIORITY: 1 SOURCE: RRRB Action Item 19.00108 DESCRIPTION Ventilation in Essential Unit compressor compartments is natural circulation.

During hot weather operation, temperature in the compartments are elevated when the system is in operation.

The elevated temperatures may result in failure of the motor, compressor, or other compcnent.

INVESTIGATION i Temperatures hot in the Essential Unit compressor compartments will be monitored during weather operation.

Data obtained will be evaluated to determine the necessity for installation of a compartment air ventilation fan.

the qualification documentation of the compressor, motor, and instruments locat d in the compressor compartment will be reviewed to determine if' the elevated I temperatures exceed the qualification temperatures of the components. I RESOLUTION OF PROBLEM Nuclear Engineering will determine a resolution.

TESTING To be determined.

PREl.MNARY o 4. - .

3-41

"I

(,

C26 Lei?:I.:alF.D

l l

l SYSTEM PROBLEM 41 Quality of the questionable. existing CR/TSC Essential Air System refrigerant compressor motors is TRACKING NUMBER: 19.0011.H PRIORITY: 2 '

SOURCE: RRRB 19.OO11.H DESCRIPTION The compressor motors are ODP motors.

of the bearings, shaft keyway, and motor windings. Concern has teen Consideration should expressed be givenabout to th upgrading these motors to TEFC or Mill and Chemical motors.

INVESTIGATION An evaluation of the specifications for these motors will be conducted to determine the suitability of the existing motors for the intended service and the advisability of upgrading replacement motors for more severe service.

RESOLUTION OF PROBLEM j

Nuclear Engineering will determine a resolution.

TESIING Testing will not be necessary.

O PRE.lM NARY 3 -42 P. ;' .

i.

LJ* r .L . t,' t

SYSTEM PROBLEM 42 A

(,) System start during " dead" bus transfer.

TRACKING NUMBER:

PRIORITY: 1 SOURCE: LER 86-13 DESCRIPTION the CR/TSC Essential Air System Train B is powered from 480V Nuclear Service Bus 382. lhe 382 bus is powered from the 4160V Nuclear Service Bus 482 via breaker 52-38202.

The 382 bus may also be powered by the 480V Nuclear Service Bus 3B thru breakers 52-3821 and S382 (tie breaker).

During a " dead bus" transfer, breaker 52-38202 is opened, 52-3B21 is closed, and S3BZ is closed. During the evolution, the CR/TSC Essential Air train B automatically started when S382 was closed. The train also automatically started during a reverse of the aforementioned sequence when breaker 52-38202 was closed. i INVESTIGATION A special test procedure will be written and performed to duplicate the circumstances in an attempt to repeat the event. Additional investigation will be j performed as necessary.

RESOLUTION OF PROBLEM To be determined.

l TESTING To be determined.

l c:)

PREUMMRY

a. .. . , . -

3-43

b' ,h t....- e

l SYSTEM PROBLEM 43 O ceno potentialte or im paths bypass time ea c emti around the1HEPA air " eater ca"-a-sasa and carbon me as-a-sase) re filter banks.

TRACKING NUMBER: 26.xxxx -

PRIORITY: 1 SOURCE: System Engineer I DESCRIP1 ION The Essential Air Handler condensate drain lines, which provide a drainage path for condensation roof. from the DX cooling coil, are terminated on the Auxiliary Building Althorugh the drain lines contain liquid traps and check valves, there is no assurance path. that leakage into the essential air handler will not occur through the

( A similar problem was identified at the Trojan Nuclear Power Plant.)

INVES1IGATION N/A .

RESOLUTION OF PROBLEM I

Nuclear Engineering to provide a resolution. . I TESTING To be determined.

I o PRELIMINARY ps re , -

3-44 ,d'

. . N, > .. . iih i

l I

FUNCTION:

1

(

Isolation of the Control Room / Technical Support Center from potentially radiologically. contaminated air during a radiological event is provided by automatically closing sixteen normal system isolation dampers (eight isolation damper are actuated by each train) and opening twelve essential air handler 1 isolation dampers (six are actuated by each train). "

Source:

NUREG 0060, NUREG 0737, NUREG 0800, Technical Specification 4.10 TESTING NECESSARY TO VERIFY FUNCTION:

1he capability of the isolation dampers to properly respond in the system '

radiological event mode must be tested once per month. (Proper response is considered to be a change of position as indicated by a damper position ,

ind icator. )

Proper function of'each damper in the radiological event mode should be verified whenever the CR/TSC cannot be pressurized (per the monthly surveillance procedure) or once each refueling interval. (Proper function )

verification is a visual observation of damper blade position in each of the j

normal and displayed by radiological IDADS.) positions and comparison with the position indication ThecapabilityoftheradiationmonitortoinitiatetheCR/TSCEssentialkir '

q System in the radiological event mode must be demonst'ated r at least once each V refueling interval or once

(

Reference:

Tech Spec 4.10.18.5) every 18. months, whichever occurs first.

l l

SCOPE OF EXISTING TESTING ^

1 l

The capdbility of the isolation damoers to crocoely respond in the system

-amielogical event moce is tested once per men:n by the Surveillance Program. l

Response

train dampersof the A train by Sp dampers is tested by pe*#ormance of SP 211.01A; B 211.010.

(SP 211.01A and SP 211.010 must be revised to provide a check of damper limit switch positions per Tracking Number 26 0023 . .

Camper ooservinglimit the switch positions,' which represent camper position, are checked by DADS monitor.) l I

Surveillance Procedures SP 211.01B and SP 211.01E contain provisions for documenting the capability of the radiation cetector to initiate the CR/TSO Essential Air Syscem in tne radiological event mode.

p-ocecures ce not include instructions : test the caoability These surveillance ;

of the radiation '

ce:ector to initiate One system capability has been demonstrated. An but do provice a section to verify the signoff for this section. & O Engineer provides the cata and SP 211.01B and SP 211.01E are performed each refueling interval or once gach 18 months, wnich ever occurs first.

DIFFERENOES AND REOONCILIATION Upon completion of revisions to SP 211.01A and SP 211.010 (per resolution identified oy Tracking Number 26.0023), :ne requirement to test the capability of mode the once isolation per dampers month willtoberespond properly in the system' radiological event satisfied.

" = m. <

PRELMNRY.-- a .

A procedure which will verify proper function of each damper in the radiological event mode does not exist. A new refueling interval surveillance procedure which will verify proper function of each damper in the radiological event mode will be written and initiated. This will provide instructions for performing a visual check of actual damper position in the normal and radiological modeposition.

IDADS indicated positions and a comparison of the damper position with the (This procedure will also include similar checks of the damper response in the toxic gas mode.) )

TESTING TO BE CONDUCTED PRIOR TO RESTART Prior to restart, the capability of the isolation dampers to properly respond in the system radiological mode will be tested in accordance with Surveillance Procedure SP 211.01A and SP 211.010.

Verification of proper function of each isolation damper in the radiological ;

event mode will be completed prior to restart by performance of a new Surveillance Procedure.

A new I (Instrumentation) procedure or a new surveillance procedure, which will demonstrate the capability of the Ch/TSC Essential Air System to properly start in the radiological event mode upon actuation by the radiological detector, will be initiated.

Successful completion of the following recommended testing will demonstraNe !

the CR/TSC Essential Air System proper isolation of the CR/TSC from p

J potentially radiologically contaminated air during a radiological event:

1.

SP ,211.01A; Control Room / Technical Support Center Emergency Ventilation System Loop A Monthly Surveillance Test; revised as described above.

2. SP 211.010; Control Room / Technical Support Cwnter Emergency Ventilation I System Loop B Monthly Surveillance Test; revised as described above.

3.

SP 211.XX; Control Room / Technical Support Center Essential Air System Isolation Damper Function Surveillance; new surveillance procedure to be written.

4.

I.XXX or SP 211.XX; Control Room / Technical Support Center Essential Air System Actuation by the radiation detector; new procedure to be written.

l S.

SP 211.01B; Control Room / Technical Su: cort Center Emergency ril;ering System Lecp A Hefueling Interval Surveillance Test.

6.

Sp 211.01E; Control Room / Technical Support Center Emergency Filtering System Loop B Hefueling Interval Surveillance Test.

O PRELMNARY r, '

tt . ?

r ;*. .

. .. .. 4. * ..

FUNCTION:

Isolation of the CR/TSC from air potentially containing toxic gas during a toxic gas event is provided by automatically closing eighteen isolation dampers (nine isolation dampers are actuated by each train) and opening ten essential air handler isolation damper (five are actuated by each train).

Source :

NUREG 0660, NUREG 0737, NUREG 0800, Technical Specification 4.10 TESTING NECESSARY TO VERIFY FUNCTION:

The capability of the isolation dampers to properly respond in the system toxic gas mode must be tested once per month. (Proper response is considered to be a change of damper position as indicated by a damper position indicator.) (Reference Tech Spec 4.10.1A and 4.10.10)

Proper function of each damper in the toxic gas mode must be verified whenever onceCR/TSC the cannot be pressurized (per the monthly surveillance procedure) or each refueling.

(Proper function verification will consist of a visual observation of damper blade position in each of the normal and toxic gas positions and comparison with the position indication displayed by IDADS.)

Ihe capability of the chlorine detector to initiate the CR/TSC Essential Air System in the toxic gas event modo must be demonstrated at least once each refueling interval or once every 18 months, whichever, occurs first.

A (Reference Tech Spec 4.10.18.6)

U SCOPE OF EXISTING RESTING The capability of the isolation dampers to properly respond in the system of thegas toxic mode A train is tested once per month by the Surveillance Program. Response oamoers is tested by perfonnetnce of SP 211.01A; E train camper by SP 211.010.

(SP 211.01A and SP 211.010 must be revised to provide :a check of camper limit switch positions per the resolution of Tracking Nummer 26.0023.

Camper limit switch positions, which represent damper position, are ,

enecked by coserving the IDADS monitor.) l Su-veillance P ocedure SP 211.01E and SP 211.01E contain provisions for documenting the capability of :ne chlorine gas detector to initiate the CR/TSO Essential Air System in the toxic gas event mode. These surveillance l procedures do not include instructions to test the capability of the chlorine gas cetector cacx:ility to initiate has been tne system but do provide a section to verify the comonstrated. An 4 C Engineer provides tne cata and signoff for this section SP 211.01B and SP 211.01E are performed each refueling interval or once each 18 months, which ever occurs first.

DIFFERENCES ANO RECONOILIAT' EON Upon completion of revisions to SP 211.01A and SP 111.010 (per resolution identifisc by Tracking Number 26.0023), the capability of the isolation O campers to respond properly in the system toxic gas mode will be thoroughly tested once Per coath.

,,j. ..

4-3

. ...t. ..

o A procedure event which mode does notwould exist.verify proper function of each damper in the toxic gas V A new refueling interval surveillance procedure which will verify proper function of each damper in the toxic gas event mode will be written and initiated. This procedure will provide instructions for performing a visual check of actual damper position in the normal and toxic gas mode positions indicated position. and a comparison of the damper position with the IDADS damper response in the radiological event mode.)(This procedure will also A new I (Instrumentation) procedure or a new surveillance procedure, which will demonstrate the capability of the CH/TSC Essential Air System to properly start in the initiated. toxic gas mode upon actuation by the chlorine detector, will be IESTING TO BE CONDUCTED PRIOR TO RESTART Prior to restart, the capability of the isolation dampers to properly respond in the system toxic gas mode will be tested in accordance with Surveillance Procedures SP 211.01A and SP 211.010.

Verification of proper function of each isolation damper in the toxic gas event mode procedure.

surveillance will be completed prior to restart by performance of a new The capability of the CR/TSC Essential Air System to be initiated by the chlorine or a newgas detector procedure.

surveillance will be demonstrated by perfomance of a new I procedure Successful completion of the following recommended testing will demonstrate the proper toxic gas isolation function of the CR/TSC Essential Air System:

1.

SP 211.01A; Control Room /Tecnnical Suoport Center Emergency Ventilation System Loop A Monthly Surveillance Test; revised as cascribed above.

2.

SP 211.01D; Control Room / Technical Suppo-t Center Emergency Ventilation System Loop E Monthly Surveillance lest; revised as described above.

3.

SP 211.XX; Control Room / Technical Sucacrt Center Essential Air System Isolation written.

DaJaper Function Surveillance; new surveillance procedure to be 4

I XXX or SP 211.XX ; Control Room / Technical Support Center Essential Air System Actuation by the Chierine Gas Decector; rew procedure to oe written.

S.

SP 211.01B; Control Repm/ Technical Sup;c-t Center Emergency Filtering Syster. Loop A kefueling Interval Surveillance Test.

6. SP 211.01E:

Control Room / Technical Support Center Emergency Filtering System Loop B Hefueling Interval Surveillance Test.

O

~

PREl.MNk.RY .

7. .

l FUNCTION:

Provide cooling for the CR/TSC during radiological, toxic gas, CR/TSC hi temperature, temperature at or80*F loss of or offsite less. power events by maintaining the CR/TSC Source: NUREG 0660, NUREG 0737, NUREG 0800 TESTING NECESSARY TO VERIFY FUNCTION:

the cooling capability of the CR/TSC Essential Air System must be tested each refueling interval during an extended operating run of the system. During this period, the Essential Air System must maintain the CR/TSC temperature within acceptable limits.

The Cooling capability of the refrigeration system must be demonstrated with the Essential Air System operating in the radiological event mode and the toxic gas mode.

The capability of the CR/TSC Essential Air System to start upon a simulated hi temperature must be demonstrated each refueling interval.

the capability of the CR/TSC Essential Air System to cool the CR/TSC during a loss of offsite power event must be demonstrated once upon completion of the installation of the TDI diesel generators.

I The capability of the CR/TSC Essential Air System to cool the CR/TSC during a q loss of offsite power event must be verified monthly by completing both of the following:

V 1.

Demonstrating that the. Emergency Generator System will provide adequate power to the Nuclear Service Bus.

2.

Monitoring operation of the CR/TSC Essential Air System while powered from the Nuclear Service Bus.

Operation of the CR/TSC for prcper operation Essential Air refrigeration system must be monitored each month.

Tne cooling capability of the CR/TSC Essential Air Systeg,must be tested after modifications before restart.and caintenance on the refrigeration system are complete and SCOPE OF EXISTING TESTCNG Operation of the CR/TSC Essential Air refrigerant system is monitored on a monthly basis by Surveillance Procecure SP 211.01A and SP 211.010.

is powered from the Nuclear Service Buss during performance of theseThe system surveillance procedures. '

Surveillance Procedures SP 206.03A and SP 206.03B are performed monthly to cemonstrate the capability of the Diesel Generators to power the Nuclear o Service Bus. These procedures apply to the existing EMO ciesels.

PREUngy..

...'.n

DIFFERENCES AND RECONCILIATION q

b There is currently no test procedure for testing the cooling capability of the CR/TSC Essential Air System upon completion of the modifications which will be implemented prior to restart.

A Special Test procedure for testing the operation of the CR/TSC Essential Air refrigeration system will be initiated to test the system upon completion of modification and maintenance.

A refueling interval test procedure does not exist for testing the cooling capability of the CR/TSC Essential Air System during an extended operating run. A new surveillance procedure will be written to verify that each train of the system will cool the CR/TSC during an extended operating run while operating in the radiological and toxic gas modes.

A refueling interval test procedure does not exist for testing the capability of the CH/ISC Essential Air System to start upon a simulated hi temperature.

A new surveillance procedure will be written to verify this capability.

A test procedure for testing the cooling capability of the CR/TSC Essential Air System during loss of offsite power does not exist. A test of the system cooling involvingcapability willdiesels.

the new TDI be incorporated in the loss of offsite power te,st A monthly surveillance procedure for testing the capability of the TDI diesels to power the Nuclear Service Bus does not exist. A new surveillance proeddure will be written to enable accomplishment of this testing on a monthly basis.

] TESTING TO BE CONDUCTED PRIOR TO RESTART A test of the refrigeration system, to verify proper function, will be conducted upon completion of maintenance and modifications.

Refuelir.9 interval testing, including a test of the cooling capability of the system during an extenced run, will be completed prior te restart.

Successful completion of the following recommended testing will demonstrate that the CR/TSC Essential Air System will properly provice cooling for the CR/TSC during radiological, toxic gas, CR/TSC hi temperature, and Icss of )

offsite power events:

1.

SP 211.01 A; Control Room / Technical Support Center Emergency Ventilation System Loop A Monthly Surveillance' rest.

C. SD I11.010; Centaol Room /Tecnnical Support Center Emergency Ventilatien System Loop B Monthly Surveillance lest. ,

1

3. Sp 211.XX: Control Roor/ Technical SuppoM: Center Emergency Ventilation System Refueling Interval Cooling 'les:: new surveillance procecure to initiated. This ; ocedure will include an extended curation cooling test with the system operating in the radiological moce and the toxic gas mode. The capability of the system to start upon a simulated hi temperature will also be demonstrated.

-)

4-6

4.

STP-XXX; Control Room / Technical Support Center Essential Air

{~h s/ Hefrigeration System rest; special test procedure to be written. This procedure will test the cooling capability of the system after completion of modifications and maintenance.

5.

Surveillance SP and SP procedures SP 206.03A and SP 206.038 for the EMD diesels and for the TDI diesels will be performed monthly to verify the capability of the diesels to power the Nuclear Service Bus.

6.

A test of the cooling capability of the CR/TSC Essential Air System during Procedure STP a loss of offsite power event will be incorporated in Special Test (test of the 1DI diesels), i i

i c:)

i l i

l l

l i

6 o PRELIMINARY r;r .

. r u.c . .;.

FUNCTION:

() Prevent infiltration of potentially radiologically contaminated air into the CR/TSC during radiological events by pressurizing the CR/TSC to 0.125 I.W.G relative to outside atmosphere with a flow of 1600 CFM 210%.

Source:

NUREG 0660, NUREG 0737, NUREG 0800 Technical Specification 4.10.

TESTING NECESSARY TO VERIFY FUNCTION:

A 1he capability of each train of the CR/TSC Essential Air System to pressurize the CR/TSC while developing the proper flow rate through the outside side air intake must be tested at least once per refueling interval. (Reference Tech Spec 4.10.1B 7) 1he capability of each train of the CR/TSC Essential Air System to pressurize the CN/TSC must be tested on a monthly basis.

SCOPE OF EXISTING TESTING Surveillance Procedures SP 211.018 and SP 211.01E test the capability of the Essential Air System to pressurize the CR/TSC while developing the proper flow through 18 months.the outside air intake at least once each refueling interval or every i

DIFFERENCES AND RECONCILIATION

)

A procedure which will test the capability of the CR/TSC Essential Air System to pressurize the CR/TSC on a monthly basis does not exist. Surveillance Procedures SP 211.01A and SP 211.010, which test the CR/TSC Essential Air System on a monthly basis, will be revised to includo a prc::urization test.

TESTING TO BE CONDUCTED PRIOR TO RESTART the capability of each train of the CR/fCS Essential Air System to pressurize the CR/TSC while develeping the proper flow rate through the outside air intake must be tested after ccepletion of damcor maintenance and air distribution system talancing prior to restart, o

A-B PRR!MMY n -

h= . . .

s i u .c .v . a . . . . . . : '. .

Successful completion of the following recommended testing will demonstrate that the Control Room / Technical Support Center Essential Air System will properly pressurize the CR/TSC to 0.125 IWG relative to outside atmosphere:

1.

SP 211.01B; Control Room / Technical Support Center Emergency Filtering System Loop A Refueling Interval Surveillance Test.

2. SP 211.01E:

Control Room /lechnical Support Center Emergency Filtering System Loop B Refueling Interval Surveillance Test.

3.

SP 211.01A; Control Room / Technical Support Center Emergency Ventilation System Loop A Monthly Surveillance Test; procedure must be revised to include a pressurization test.

4.

SP 211.01D; Control Room / Technical Support Center Emergency Ventilation System Loop B Monthly Surveillance 'lest; procedure must be revised to include a pressurization test.

l I

i o :

PRUIMINA.,RY.., .

' E e'5$..k i

FUNCTION:

O arevide fresh. filterea. cenettienee svant, air for caerse ventit tion euries radiological and loss of offsite power events by maintaining a flow of 3200 CFM 210% through the Essential Filtration Unit.

Source: NUREG OG60, NUREG 0737, NUREG 0800, Tech Spec 4.10 lESTINGNECESSARYTOVERIhYFUNCTION:

!fa g lhe capability of each CR/TSC Essential Air Filtration Unit to provide fresh, 1 p

filtered, conditioned supply air at a flow rate of 3200 CFM must be tested every refueling interval, or once each 18 months. Each HEPA filter bank must ,

demonstrate a DOP removal efficiency of at least 99.9% and each carbon bank l must demonstrate a freon removal efficiency of at least 99.5%. The total pressure drop across the combined HEPA filter banks must not exceed 6 IWG at a flow rate of 1600 CFM t 10% through the outside air intake. (Reference Technical Specifications 4.10.1B.1, 4.10.1B.2, 4.10.18.4, and 4.10.18.8.) l 1

The radioactive methyl iodide removal efficiency of the carbon adsorbent in each carbon filter bank of each Essential Filtration Unit must be tested once each operatingrefueling time. interval and after every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of filtration unit elapsed (Reference Technical Specification 4.10.18.3)

'the capability of the CR/TSC Essential Air System to supply air for CR/TS ventilation during a loss of offsite power event must be demonstrated once upon completion of the installation of the FDI diesel generators.

The capability of the CR/TSC Essential Air System to supply air for CR/TSC '

ventilation during a loss of offsite power event must be verified monthly by completing both of the following:

1.

Demonstrating that the Emegency Generator System will provide adequate power to the Nuclear Service Sus.

2.

Monitoring operation of the CR/TSC Essential Air System while powered from the Nuclear Service Eus.

Test acent injection manifolds will be added to the Essential Air Filtration Units to facilitate testing to satisfy the aforementioned requirements. The test agent injection manifolds must be tested to assure the various filter tanks are uniformly challenged by test agent injected thmugh the manifcids.

SOOPE OF EXISTING TESTING Surveillance Procedures SP 211.01B and SP 211.01E contain provisions for testing :ne efficiency of the HEPA filters and carbon adsorber sections of each filtration unit. Air flow rate through each filtration unit is measured when the surveillance procedure is perfomed. These procedures also include provis; ens for determining the radioactive methyl iodide rer., oval efficiency of the car::en adsorber sections. ihese surveillance procedures are perfomed O once ea=s ref=etine intervat or once eacs 18 ath wnica ever occore fir :-

PRhlMWRY 4 -

. n

. ~ . m '. C a 3 a L

DIFFERENCES AND RECONCILIATION

(";

\_/

The radioactive methyl iodide removal efficiency of the carbon adsorbent material in each carbon adsorber section is measured after every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of elapsed operating time by performance of SP 211.01C.

The differential pressure across each filter bank is measured by Surveillance Procedures SP 211.01A and SP 211.010 on a monthly basis.

Differential pressure across the HEPA filter banks and flow through the outside air intake is measured once each refueling interval or every 18 months by performance of Surveillance Procedures SP 211.018 and SP 211.01E.

Surveillance Procedures SP 206.03A and SP 206.03B are performed monthly to demonstrate the capability of the Di.esel Generators tc power the Nuclear Service Bus. These procedures apply to the existing OMD diesels.

A test procedure for testing the capability of the CR/TSC Essential Air System to supply ventilation air during a loss of offsite power event on a one time basis does not exist. A test of this capability will be incorporated in the loss of offsite power test involving the new TDI diesels. _

A monthly surveillance procedure for testing the capability of the TDI diesels to power the Nuclear Service Bus does not exist.

A new surveillance proc 9 dure will be written to enable accomplishment of this testing on a monthly basis.

1 A procedure for testing the test agent injection manifolds does not exist.

() Special manifolds.

Test Procedure will be written to test the test agent injection A !

TESTING TO BE CONDUCTED PRIOR TO RESTART Surveillance Procedures SP 211.018 and SP 211.01E will be performed prior to restart.

Tnese procedures incluce provisions for deter =ination of the radioactive methyl iodide removal efficiency of the caroon acsorbent material; therefore, performance of SP 211.01C will not be necessary, lhe test agent injection manifolds will be tested prior to performance of l Surveillance Procedures SP 211.015 and SP 211.01E.

Successful completion of the following recommended testing will demonstrate l that the Control Room / Technical Support Center Essential Air System will !

properly provice fresh, filtered, conditioned sucoly air for CR/TSC ventilation oudng radiological arxf loss of effsite power events by maintaining a flow of 3200 CrMg:14 "Anrough each Essential Filtration Unit:

1.

SP 211.01A; Control Roqm/ Technical Support Center Emergency Filtering System Loop A Monthly Furveillance Test.

2.

SP 211.010; Contrcl Room / Technical Suoport Center Emergency Filtering System Loop B Mon:hly Surveillance Test.

_" ~

PREUMINARY , ,

=

m. h ke M..7m h

3.

SP 211.01B; Control Room / Technical Support Center Emenjency Filtering System Loop A Nefueling Interval Surveillance test.

{dN 4

SP 211.01E; Control Room / Technical Support Center Emergency Filtering System Loop B Refueling Interval Surveillance lest.

5.

SP 206.02A; Refueling Interval Diesel Generator A SFAS Start Test (this Surveillance Procedure utilizes EM.177A, Function l'est of Nuclear Service Bus A and A2 Unloading Scheme).

6.

SP 206.02i3; Refueling Interval Diesel Generator B SFAS Start Test (this Surveillance Procedure utilizes EM.1778, Function Test of Nuclear Service Bus 8 and 82 Unloading Scheme).

7. SP and SP ; Monthly Test of the TDI Diesels.

8. SP 206.03A: Diesel Generator G886A Synchronization Surveillance Test.

9. SP 206.03B; Diesel Generator G886E Synchronization Surveillance Test.

10. STP _ ,, (Loss of offsite power test) will incorporate a test of the ventilation capability of the CR/TSC Essential Air System during a loss of offsite power.

11. STP

Test of CR/TSC Essential Filtration Unit Test Agent Injec ion Manifolds.

O l

l

~

) rey >.,,MINARE yg

' .- - :' h

i RESULTS OF REVIEW OF TEST RESULTS FROM DAVIS-BESS l

() I.

Comparison of Testing Davis-Besse Tests Rancho Seco Tests TP 170.05 Control Room Heating, Ventilation, and Air Conditioning An approved formal procedure for Preoperational Test procedure checked testing the Control Room Normal Air systc= and component operability, conditioning system has not been control logic, and interlock functions identified.

prior to start up of the system but did not verify performance of the Control Room Emergency Ventilation System condenser or closure of the isolation dampers on hi chlorine signal.

ST 5076.01 is performed every 31 days to verify that the Control Room SP 211.01A and SP 211.01d are Emergency Ventilation System is performed every 31 days. To verify operable. each respective train of the_ CR/TSC This is done by starting and operating each train for 15 Essential Air Conditioning System is minutes, operable, each train is operated for at least 15. minutes.

j ST 5076.02 is performed at least once every 18 months to verify that the SP 211.018 and SP 211.01E are

{'/g s- Control Room Emergency Ventilation performed at least once every 18 System is operable. Operability is months to verify that each train of verified by cemonstrating: the Control Room Essential Air System is operable. Operability is verified by demonstrating:

1. System air flow rate.

2. DOP removal efficiency of the 2.

HEPA filter bank. DOP removal efficiency of each HEPA filter bank.

3. Halogenated hydrocarbon

3. Halogenated hydreraroon refrigeran test gas removal j efficiency of the carbon refrigeran tes: gas removal filter bank. efficiency of each filter bank.

1 l

o 5-1 PREUMINIRY .

m e. ..

h&ll . .. '

- i s -o ..m. , , , , ,

Davis Besse Tests Rancho Seco Tests

(~)

(/ ST 5070.03 is performed every refueling outage to verify: SP 211.01A and SP 211.010 are performed every 31 days to verify

1. The Control Room Normal Air that the Control Room / Technical Conditioning System is isolated Support Center is isolated when each by a SFAS signal and a station train of the Essential Air System is vent radiation hi signal, operated in the radiological event mode. The capability of each train

2. the pressure drop across each to start and operate upon SFAS was demonstrated by performance of combined HEPA filter and charcoal STP 194, absorber in the Control Room SP 211.01B and SP 211.01E Emergency Ventilation System is are performed every refueling outage less than 4.4 I.W.G. while to verify that differential pressure operating at 3300 CFM t 10% across the combinsd HEPA filter and when supplying the Control Room Carbon Absorbers is less than with outside air, 6 I.W.G. while operating at a flow rate of 3200 CFM : 10%.

3. The air flow rate from the outside air makeup is 300 CFM t l 10%. ,

ST 5076.04 is performed after every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of -charcoal adsorber SP 211.01C and SP 211.01F are j i operation to verify that a performed after every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of repre'sentative carbon sample is charcoal absorber operation to ;

(}

i obtained and a laboratory analysis verify that a representative carbon '

is completed within 31 days of sample sample is obtained and that a '

removal. laboratory analysis is completed within 31 days of sample removal to verify that radioactive methyl iodine removal efficiency is at '

least 95%.

ST 5037.01 is performed at least every IE months to demonstrate that the SP 211.01A and SP 211.01D are chlorine system is operable by performed every 31 cays to verify performance cf a enannel calibration. that the Centrol Room / Technical Suppor Center is isolated when each train of the Essential Air l System is operated in the toxic gas mode.

O S-2 PRELMNARY = r_.. . - . - -

i-

.. . e

II. Functional Test Procedures

( ,) SP 211.01A (and SP 211.010); Control Room / Technical Support Center Emergency Ventilation System Loop A (and B) Monthly Surveillance Test.

SP 211.018 (and SP 211.01E); Control Room / Technical Support Center Emergency Filtering System Loop A (and 8) Refueling Interval Surveillance Test.

SP 211.01C (and SP 211.01F); Control Room / Technical Support Center Emergency Ventilation System Carbon Absorber Filter 720 Hour Surveillance '

Test.

III. Review Findings The existing surveillance testing of the Control Room / Technical Support i Center Essential Air Conditioning System, with the exception of isolation l damper position indication, is adequate to meet the surveillance !

requirements of the Technical Specifications. However, surveillance procedures are not adequate to demonstrate cooling . capability of each Essential Air Train.

IV. Recommendations A. Surveillance Procedures l 1.

SP 211.01A and SP 211.01D should be revised to include a check

("]e s-of all four of the possible position indications for each damper in the CR/TSC Essential Air System. This should be accomplished prior to restart.

2.

SP 211.010 and SP211.01E should be revised to include measurements of flow thru the outsice air intake and return air cucts to assure that a flow rate of 1600 CFM is maintained thru each flow path.

3. A new refueling interval surveillance procedure should be l initiated to include an 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months operating period to check the cooling capacility of the CR/TSC Essential Air System, a check of the Safety Feature actuation capability, a check of the radiological event actuation capability, and a-check of the toxic gas vent actuation capability. This should be accomplished prior to restart.

4.

SP 211.C1A and SP 211.01D should be revised to include a check of ref rigerant system operation.

o PRRMERY 5-3 p ar- --

J. .

O

B.

Periodic Maintenance Procedures s

1.

A new Periodic Maintenance Procedure should be initiate to check the CR/TSC Normal Air Conditioning System. This will assure that the Essential Air System will not be unnecessarily challenged by failure of the Normal Air System.

2.

A new Periodic Maintenance Procedure should be initiate to assure the Chlorine Detection System is adequately maintained. The procedure should include instructions for replenishment of material which has depleted or deteriorated during operation, adjustments and calibration, and functional checks.

3.

A new Periodic Maintenance Procedure should be initiated to assure Essential Air System Dampers are properly naintained. The procedure should include instructions for inspecting, cleaning, damper actuators. and lubricating the dampers and O

i o

o }REJMINARY S.

i

.,.u_...

. ..~

P;-

Jie

i I

Results of Review of Recent Maintenance Activity and Maintenance History Trends

)

Complete Mechanical Work Request Listing W.R. 96861 Disassemble and inspect V-545A compressor with vendor, t

W.R. 96862 Disassemble and inspect V-5458 compressor with vendor.

W.R. 97237 Replace damaged carbon adsorber trays.

W.R. 97754 Realign V Belts on AHD-A-545 A+B Air handlers.

I W.R. 97755 SF-A-78 Filter unit replace flex connection on fan discharge.

W.R. 97752 O

\J AH-A-545A - Inspect and check vibration in fan and motor.

W.R. 9774/ .

U-0545B - Inspect noise in Searings on Compressor.

W.R. 97776 l

SF-A07A - Rebalance Fan W.R. 97779 U-545A - Replace Gasket in Suction line.

W.R. 97798 AH-A-545A - Install kit in thermo expansion valve.

W.R. 97799 .

AH-A-545S - Install kit in therne expansion valve, o .

PREllMINARY 9

6-1 ' ;""

< Q!i

.+ .-

f*

If ,

Complete Mechanical Work Request Listing (Continued)

() W.R. 98034 Install train. protective corners over Differential Switches on both A and 8 W.R. 98035 SF-A-7A - Replace plexiglass sight glasses.

W.H. 98035 SF-A Replace plexiglass sight glasses.

W.H. 98244 SF-A Replace plexiglass sight glasses.

W.R. 98246 RS Repair small hole in carbon adsorber tray, '

W.R. 98254 .

U-545A - Replace suction valve per NCR.

W.R. 98344 Train A - Repair leak in refrigerant copper pipe.

W.R. 92345 Train B - Repair leak in refrigerant copper pipe.

W.R. 98345 U-545 A and B - Refill compressor with oil.

W.R. 98538 U-545A - Remove motor end bells + inspect hearings.

W.R. 98752 U-545A - Replace motor bearings per NCR.

W.E. 94576 U-545.A and B - Various bra:ed joints need to be re-bra:ed tG L

.-2 PetiMINARY

Complete Mechanical Work Request Listing .(Continued)

W.R. 94/2/

O' U-545 A and B - Remove compressor head gaskets and replace .

W.R. 110455 U-501B Change filter on air conditioning unit.

W.R. 109120 Replace missing bottom door latch on U-5458 Essential a.c .

W.R. 103962 Replace filter driers at evaporator coil in 545-A.

W.R. 103962 Replace filter drier at evaporator coil in 545-8.

W.R. 103900 Replace filter driers on AH-U-28-NSEB condensing units .

W.R. 10128 O

Replace air filter on AHA-545A air handler.

W.R. 101096 Check the hot gas bypass valve on U-545-B train.

W.R. 101073 Replace gaskets on HEPA filters SFA-7A/B Essential'HVAC.

Maintenance Review These twoof is recuired units them.have recuired consicerable work fer the type cf servic e that compressor's for vendor inspection.Part of this, of course, was One cisassembly cf the One common problem is noise and bearing failure in fans and comoressors with several having been replaced in only one year cf service.

some of these problems were with ne units at the time iney were putItinto is evident that incurred during construction. service and also that some of the rther requests O

6-3 PRRMNARy fy r. ~m - - - . -

/ 7- - -

7p

. , , . ; ,f *

-a.1:.6'2P.9

Complete Mechanical Work Request Listing (Continued)

It is difficul't to identify any maintenance trends from the limited service these will units monitoring require have had but it indicates the bearings in compressors and motor routinely. s 1he filteron changing driers and basis.

a routine Air flow filters will also require and servicing or 1

1 l l

O l l

g MEWNARY 64

, , . . ,, .y ..,g,, ,

e~s, ' *

f

- ,s .

Complete Damper Work Request Listing

/^))

( W.R. 11635S Damper HV-54707 did not operate.

W.R. 114662 Damper HV-54705 did not indicate properly.

on this work request. Thirteen dampers were checked Four were found to have indication problems.

W.R. 111572 Damper HV054727 did not indicate closed.

W.R. 114656 Damper HV-54732 Damper indic ates both open and closed at same time .

W.R. 113808 Damper HV-54732 Damper indicates both open and closed at same time .

W.H. 1146SS O Damper HV-54727 Damper indicates both open and closed at same time W.R. 103995 Noise in solenoid of actuator on HV-54732.

W.R. 103997 HV-54731 Ncise in Solenoid when energized.

W.R. 103990 HV-50125 Noise in Solenoid when energized.

W.R. 114864 HV-54715-M Adjust limit switch.

W.R. 113609 HV-54710 Failed to repos,ition while conducting S0-211.010.

0 6-S

'PREllMINARY

. .:t.m

. -- - -- - - - r m

Complete Damper Work Request Listing (Continued)

O W.R. 115046 HV-54706 Failed to reposition while conducting SP-211.010.

W.R. 9/527 HV-54733 Replace limit switch.

W.R. 97761 HV-54722B Replace pnewmatic opertor with same type.

W.R. 98250 1 Hv-54705 Replace motor or repair open winding. \

W.R. 99494 FV-54702 Replace limit switch.

Damper Review j

The or and damper problems incorrect close oralmost open all fall into the category 'of incorrect indication position.

Q It appears that a routine rr.aintenance program on the dampers which requires cleaning and relubrica on a periodic basis will remedy most of these problems.

Some of these work requests reflect a lack of complete understanding as to where the damper should be when all conditions are considered, when running surveillance procedures.

One ether common problem has been noise in the solenoid valves when they ar enegized if this continues to increase they will require replacement.

s o PREllMINARY

w. - .~ ~, . , _

6--6 :

,e ,

~

.. . n ],, ; . ., p J-:. : .. c .. ;

~

Complete Instrumentation Work Request Listing W.R. 114660 Investigate Radiation /Hi Temp Auto Start Circuit on Train B.

W.R. 114661 Investigate Relay CRSFB3/XAJ.

W.R. 114658 FT-54701 Flow indication intermittent when running.

W.R. 99967 Replace oil switch on V05038.

W.R. 98479 FT-54701 Transmitter has no output. _

W.R. 98481 I

A Train flow indicating loop reads high.

W.R. 101524 PDISH-54701 Zero adjustment screw is jammed; W.R. 101525 POISH-54702 Zero adjustment screw is jammed. I W.R. 101526 POISH-54706 Zero adjustment screw is jammed.

W.R. 101544 PDISH-54702 High alarm contacts are stuck closed, W.R. 101559 t PDI-54706 Indicator is sticking. 1 W.R. 82508 '

V-545B Rework Fuse blocks in cabinet.

o PREMNARy 6-7 - -- -

r";r- t-

. n . .y . v' :

1 e . .:.; * ,, Z *. . . . . E i t'

Complete Instrumentation Work Request Listing (Continued)-

W.R. 96368 PDT-54702 Remove cross threaded instrument fitting.

W.R. 108836 Replace lens on power off lite on V-545A compressor.

W.H. 101090 Calibrate oil pressure switch PDSL on N.S.E.8. Air Cond.

Instrumentation Review The instrumentation startup. work has been acceptable for this period of time after Instrument failures are the greatest the first year and these.

systems have not had that many.

The PDIs that were furnished with the units had some problems when delivered and vere sent back for replacement. The new units have not experienced as many calibration problems.

j will facilitate problem identification.A computer tracking system for instrum o

I o )REllMINARY 6-8 r'. ~ > ~~ P ? ? r. w r r -

. e *s

L' k _m as b6 ( '-

. _ _ J

> j RESULTS OF SYSTEM MATERIAL CONDITION WALKDOWN k

Conditioning System is currently in progress.A walkdown rto determine for about one year; therefore, The system has been in place components is not expected. significant deterioration of the various condition condition. of the system revealed that the system is in very good m Dampers are the first of the items to be examined in the walkdown .

Access doors system dampers.which allow visual examination of the dampers exist for 22 of the 28 to gain access. Six dampers do not have access doors- duct must be removed functional problems.Four of the 28 dampers have been determined to have r

l o

t o 3RLM NARY -

7-1

^

V' .'s a 6 . .. 5. N i;.1

_ "

ML20197C721

Contents

Text

SUMMARY

10.8 DESCRIPTION

Reference:

Response

Navigation menu

ML20197C721

Text

SUMMARY

10.8 DESCRIPTION

Reference:

Response

Navigation menu

Search