Text

Rev 0 to RCIC Reliability Analysis,River Bend Nuclear Station
	ML20102A302
Person / Time
Site:	River Bend
Issue date:	09/10/1991
From:	Christie B, Holbert O, April Nguyen; GULF STATES UTILITIES CO.
To:	;
Shared Package
ML20102A299	List: RBG-37217, Forwards Rev 0 to RS-91-137, RCIC Reliability Analysis, River Bend Nuclear Station. Rept Submitted as Followup to Sys Reliability Program Presentation at Facility on 920623 & Will Serve as Addl Info for Remick to Clarify Questions; RS-91-137, Rev 0 to RCIC Reliability Analysis,River Bend Nuclear Station;
References
	RS-91-137, RS-91-137-R, RS-91-137-R00, NUDOCS 9207240208
	Download: ML20102A302 (78)
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. Report lio. RS-91-137_

Revision 0 Page 1 of 73 REACTOR CORE ISOLATION COOLING RELIABILITY ANALYSIS RIVER BEND-NUCLEAR STATION by _

RELIABILITY & PERFORMANCE ASSOCIATES for '

RELIABILITY SYSTEMS ENGINEERING DEPARTMENT RIVER BEND NUCLEAR GROUP Prepared by: __> i # 9/- 4%

Bob Christie '

Khoa Nguyen / V /

Reliability Consultant Co-op Student Reviewed by: /Nk -

A. . J (/ " Zoom'" Nggy'en Sr. Engineer Approved by: , Me ~, [

O. .A. " SkipF' Holbert, Jf. 4ff Supervisor-ReliabilityJSystems-pamn m4h-

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Report No. RS-91-137 Revision 0 Page 2 of 73 I

i TABLE OF CONTENTS l

I Introduction s

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II Objective and Summary l

III Definitions J

l IV RCIC Model i

e i V Critical Equipment -

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t V1 Periodic Maintenance 1

! VII F veillance Test Procedures i

i VIII Recommendations 1

I: References i

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i. X Figures

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XI Tables i

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Rcport No. RS-91-137 Revision 0 Page 3 of 73-I. Introduction In the United States today, nuclear power plant personnel are being asked to improvo plant performanco with limited tudgets.

This objectivo has led nuclear power plant personnel to focus their attontion on equipment that has a high impact - on power gonoration and public health risk. Forer plant personnel are also trying to provent equipment failuro rather than repair equipment after failuro.

In the maintenanco area, a largo amount of interest has boon shown in recent years in the use of reliability engineering to help focus the attention of maintenance personnel on -high impact-equipment. The nuclear utility industry now has a small body of rollability engineers who have boon working on Probabilistic Risk Assessments (PRA) of the nuclear units and are familiar 1th rollability engineering. River Bond -personnel have boon following the efforts in the United states .to mako -uso of r)1iability engineering in areas other than Probabilistic Risk Assessments to quantify public health risk. The techniques used in the PRA's are soon as tools to help River Bond personnel mako better decisions. The effort documented in this - report was motivated by the desire to measure the usefulness of reliability-engineering techniques in the maintenance area. The results will be useful not only to maintenance personnel but- also to operations and engineering personnel.

R0 port No. RF-91-137 Revision 0 Pago 4 of 73

11. Objectivo and Summary The objective of this analysis is te assist in the development of a maintenance strategy that will achiavo and maintain an acceptable lovel for the conditional probability of the Reactor Core Isolation Cooling (RCIC) S starting and running for four hours given a valid demand. ystem The conditional protability for the RCIC system starting and running for four hours has ranged from 83% to 89% as seen in Figure 1.

The preventivo maintenance tasks- and the- Surveillanco Test s Procedures which are presently being implomonted for the RCIC system have boon reviewed against . the operating history - of the com?ononts in the system and recommandations for change in those-tbscs are included in F.'ctions VI-and VII.

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. Report No. RS-91-1 4 i Revision 0 C -Page 5 .of 73 III. Definitions l Availability i

The probability that a piece - of equipment - or a system will be operating during -the time- when it is -desired to have- tho.

eqolpment or system operating, i

Can also be stated at the ratio of the operating time to the

'. total time (Up time - Total time).

j Reliability The probability that a piece of equipment or- system- will accomplish its mission over a-specified period of time.

St_aMay Ava ability The probability that' aE standby picco - of' equd pment (not. running during normal operation) will be in 'a conultion where it is possible to start the equipment. For' the RCIC system this will 1 be the probability that4 the: system- .is not in planned orn forced

! maintenance during modes 1--and 2.

i 12 Month slidino Averaae 4

Data for the parameter to be measured is taken forL the last 12 i l month period and averaged over this 12 month period.

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Report No.- RS-91-13'l Revision 0 Page 6- of 73 IV. RCIC Model A. Backoround The Reactor Core Isolation Cooling (RCIC) system is a standby system;- i.e. , _ it ~ is not normally running ~ during power operation. In _ fact, since it is. not desirable to inject cold water into the reactor pressure vessel .during -

operation, great care and attention are devoted to assuring that the system will not need to operate in the injection mode during the lifetime of the plant. The RCIC system is to be used to supply water to the reactor pressure . vessel only during emergencies when the feedwater ' system cannot:

oper.:te, the reactor-pressure is high, and the reactor water-level drops'to a point where there is danger of reactor fuel-damage.

The RCIC system is a single train system and,- as . such,= most of the system must function- to inject water into the reactor pressure vessel. There is-little redundancy in the system.

Some RCIC system 311pment may be bypassed or ignored in the short term during, injection _ _(such as the gland seal subsystem), but all. of the equipment 'along the entire path of steam from the reactor pressure vessel _ through the RCIC I

turbine to the suppression pool must function._- Also, all of the equipment along the entire path of ' water from the condensate storage tank or suppression pool through the RCIC pump to the reactor pressure vessel must function. The RCIC model included all the equipment that would allow injection

- ~ water into the vessel..

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.. ' RCIC' model was formulated upon' the _ premise that no e -rator 4ction wouldbeLallowed-in'the-calculation of the c .bability of - successful- inj e'etion linto the. reactor-ut ssure vessel. The model was based on a-four-hour mission

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.me . The four hours comes from the work done for the River-aend Station'for the Station Blackout'(loss of'all AC-power) .

sequence. !

.B. Phases Following _.a valid._ demand signal the - RCIC system must start and run. The- model kept track of three- phases of RCIC operating history.

4 1.) The. RCIC system must- be In a condition' where ' it_ is; possible to start 'he-' equipment _(standby _ availability). .l l

2. )- The RCIC Main '3 team.-Isolation: Valve -(E51*MOVF045) . must j onen. .The RCIC turbine and pump must ' start._ _ Valve _l Ebp MOVF013 must open. This was combined 'into i

-probability of start. 1 i

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Report No. RS-91-137 Revision 0 Page 7 of 73-3.} The RCIC system must run for 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

C. Standbv Availability The historical record of the RCIC system from January 1, 1988, through June 30, 1991, for operation in either modes 1 or 2 was analyzed to determine the times the RCIC system was in either planned or forced maintenance. The results are detailed in Table 1, Planned Maintenance Outages, and Table 2, Forced Maintenance Outages. Trending of the results is-shown in Figures 2, 4, and 5.

The Sta..dby Availability of the RCIC system ranges from 90%

to 96% over the period covered (Figure 2)._ In 1988 and 1989 '

the amount of time spent in forced maintenance was larger than the time spent in planned maintenance. In 1990 and 1991 this has been reversed with more time now being spent in planned maintenance (Figure 4).

D. Erobability of Start only " fast starts" were considered in the model. These are starts where valve E51*MOVF045_was_ closed when the signal to start was received. " Slow starts," where E51*MOVC002 is closed instead of E51*MOVF045, were not included -in the calculations.

From January 1, 1988, to June 30, 1991, there have been 38

" starts" of the system (Table 3). . All but one of these starts have been during surveillance testing. . The only non-test start of the system occurredLon November 13, 1989, when a de-power-bus was lost. ThezRCIC system:was isolated ~due

-to the bus failure. When power to the-bus was restored, the RCIC system received an inj ection -signal and the turbine / pump started, but was quickly stopped by'the control operating . foreman (COF) before any condensate storage tank water could be injected.

Of the 38 starts, 35 were - successful. Thure were three

'occasionc when the -RCIC turbine _ tripped because of over-speed; December 11, 1988, January -3, 1990, and December _2,_

1990. Figure 3 shows-the trend in probability og start.

E. frobability of Run Approximately 17 hours1.967593e-4 days 0.00472 hours 2.810847e-5 weeks 6.4685e-6 months of 'run time-- were accumulated 'during the successful: starts of the RCIC system. _ A generic failure to run value of 4_x 10-4/ hour for thelRCIC pump / turbine was

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! used - and updated with zero failures in .17 hours1.967593e-4 days 0.00472 hours 2.810847e-5 weeks 6.4685e-6 months and the-valueLstayed essentially at 4 x 10-4./ hour. Failure rates of motor operated ~ valves, check- valves, and other valves are

t Report No.- RS-91-137' !

Revision 0

'Page 8. of 73 i

much lower than the pump / turbine failure rate" and were not included in the calculation. Using 4 x.10~I/ hour failure rate and a' four hour- mission - time the probability of run -

was:

Probability = e- *e- (4 x 10'~4)(4)

=

e -(1.6 x 10~3)

= 0.998 F. Conditional Probability The probabilitier from the three - phases were multiplied together and trended in Figure. l' . The conditional probability ranges from 83%'to 89%.

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Report No._ RS-91-137 Revision 0 Page 9 of 73 V. Critical Equipment A. Identification An examination of the operating history of the. RCIC system as detailed in Tables 1, 2, and 3 indicatas a wide variety of problems in the system. As indicated in-Section IV, _most of the RCIC _ equipment must functica correctly for succcss since the RCIC system =is a single train system with little redundancy.- The major trouble. area _. appears to- -

be- the

, pump / turbine and the' controls for the pump / turbine.

The mission for the pump / turbine as presently. configured is an especially difficult one. The controls'are programmed to open E51*MOVF045 (main steam isolation valve)- immediately-after a valid signal to. start is -received and use E51*MOVC002 (trip and throttle- valve) and .E51*HYVC002 (governor valve) to control the turbine. Water - _ is kept solid through the pump in order that the RCIC pump will be.

drawing suction-on water-as soon as the turbino powers- the pump. Small perturbations or- malfunctions in the first minute following a start signal can . result in system failure. This has - been true in _ the three - overspeed trip events.

B. Trends In 1988 and 1989 a number of RCIC system isolations occurred during the . performance of surveillance - tests (Table 2).

There have been no. similar instances in 1990 and 1991.

These isolations were.not a big contributor.to any: decrease -

in standby availability because they were always of short 3 duration. 4 There have been a few repairs on air operated ~ valves 7/9/88, E51*AOVF026; 1/25/89, E51*AOVF26; and 11/15/P9, 'E51*AOV54, but no pattern is evident.-

The only recurring : failure which is still causing- a significant amount of forced maintenance is'thel problem with turbine overspeed trips.

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Rsport No.: RS2 91-137 Revision:- <0-

'PageL L10? Tof: 73--

VI. -Periodic: Maintenance 1.) Equipment ID:' 1E51*TC0024

- Maintenance Taski 1336',-L ME 03074:

Frequency: Every:13Cweeks

- Clean and - . lubricate all external governor.- andl centrols:

linkage.._ Check governor valve. stroke.- Verify, proper: spring 7 tensions.

pbservation Keep . task. fAddresses an, :important failu% mode~ of1 the turbine.

2.) Equipment ID: '1ES1*TC002 Maintenance l Task 0336, ME 03192?_ g Frequency: Every-3Lmonths-Take lubricating oil" . samples 'after ' quarterlyf runi of.

STP-209-3302.-

-Observation The lube oil _ system has not been afs'ignificant;problemoarea.

. Recommend ? deleting 3this- task. iMaintenance htask : ME701549 g

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changes- the. -oil .

fin- the. turbinei Eduringi . . refueling.

Maintenance- task l ME! '03495 addst loiliitoi - theUturbine ' Las .

-necessary.7 _ _ Deletion.;of4 ME !O3192' will feliminate. thel requirement _:; to perform - a L " slow t start"1'and(f a L" quick i start" per SOP-00351after the.Loil sample hasJbeenltaken.

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3.) Equipment ID: _ 1E51*TC002/ j

, ' Maintenance' Task .123697,-- ~ME 03495 L Frequency:;-;As needed: ,

Add: oil- as - neededy andMinvestigater the : reason: .for Lturbine i beingilowc on oil.-

._ONservation m :i

~ Keep taskL JNuclear equipmentj operators iare j checking ;; oils s.

levels 3 twicef a:: day. - Task F allows maintenance crews : to -' add oil when-necessary.

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Page -11 of 73 -

4.) Equipment ID: lE51*TC002 Maintenance Task 3688, ME 01549 Frequency: During refueling Observation Frequency of_ task -is 999 (during- refueling), but- task description says " change oil in turbine por GMP-0015- every :

52 weeks." The "...^every 52 weeks" should be; deleted.

The task description includes.. an instruction . to =use the

" slow start" section of STP-209-3302 - for . retest. This is

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important'in order to arovent turbine overspeed from any; air.

introduced into-the luce _ oil-system during<the oil change.

5 . ) -- Equipment ID: 1E51*TC002:

Maintenance Task -27, ME'03174 Frequency: During refueling Inspect the right angle drive. gear assemblyj Observation Keep task. Based on General- Flutlic servius Lletter; Also licensing commitment 0G264.

6.) _ Equipment ID:- IE51*TC002 ,

Maintenance. Task 2761, , MQ- 00298-Frequency: Onfor before the third refueling. outage since last_ performed.

Internal' inspection-;of-complete: turbine-assembly..

Observation This task satisfies tlie requirements' of.EQMSR No. 1221.452-1.

Recommend that this task be - moved - to every six - refueling.

Turbine- is . running. approximately 5 to. ~10 hours per calendar ;

year. Present : frequency means complete inspection after ,

approximately 40~ hours of run - time. ~ A'_ complete . inspection ' l

-af ter . 80: hours! of run time is still probably excessive, q

R0 port No.=.RS-91-137' Revision. -0 Page_ -12 of 73 7.); Equipment ID: 1E51*T002 Maintenance Task 38, ME'01548 Frequency: Every 260 weeks Observation:

Recommend performing this task = 1) after_ completion of task 2761, MO 00298 and 2) midway between tasks 2761. That is, if task . 2761 is moved to every 6th refueling, retorque all accessible turbine bolts and nuts overy 3rd refueling.

8.) Equipment ID: 1E51*MOVC002 Maintenance Task 13272936, EL 01989-

' Frequency: Every 78 weeks Perform preventive maintenance in acc^ordance.with PHP-1205.

Observation Change frequency to during refueling. . Routine -valve maintenance during refueling is-believed appropriate.

9.) Equipment ID: 1E51*HYVC002 Maintenance Task 13273989, ME 01552 Frequency: During' refueling-Perform inspection of turbine governor _ valve _~ internals.

Observation Troubles with the . governor valve have occurred at ' River

-Bend.; However, the complete disassembly, inspection, - and reassembly of' the governor . valve during everyJ refueling is

- probably . excessive. . Recommend ~ moving': to._ everyl second or third refuelino unless: problems with the i governor:- 1 valve start to app _ ear with a great _er' frequency than in'the past..

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Report No.' 'RS-91-137~

Revision 0 Page 13- of 73 10.) Equipment ~-ID: 1E51*VF040 Maintenance Task 27, ME 02748 Frequency:- During refueling Disassemble, inspect, rework, reassemble.

Observation >

There have been some problems _ with .this check -valve especially back in 1986.. No forced outage maintenance on valve in 1988, 1989, 1990, 1991. Recommend moving frequency to every second or, third refueling.

i 11.) Equipment ID: 1E51*EC002 Maintenance Task 1327, ME 01547 Frequency: During refueling Disassemble, clean, inspect, reassemble heat _ exchanger. _ _

Observa_ tion Problems with the lube oil system did not show up as being significant. Recommend moving frequency,to every second or' third refueling.

12.) Equipment ID: 1E51*PC001 Maintenance Task 123697, ME-03363- .,

o Frequency: As needed Add oil. Investigate reason for low cil in' pump.

Observation Keep task.

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Report No. RS-91-137 Revision 0 Page 14 of 73 13.) Equipment ID: 1E51*PC001 Maintenance Task 123688, ME 01557 Fregt ency : Every 52 weeks Change oil in pump bearings.

Obse;vation Recommend moving frequency to during refueling. Pump only running about 5-10 hours per-calendar year.

14.) Equipment ID: lE51*PC001 Maintenance Task 3688, ME 01556 Frequency: Every 52 weeks Lubricate coupling.per GMP-0015

.Qbservation Recommend moving frequency to during refueling.

15.) Equipment ID: 1E51*PC001' Maintenance Task 276061, ME03539 Frequency: -Every 520 weeks Disassemble, inspect, reassemble-pump.

Observation Checking the _ pump about every 10. - years seems reasonable.

Should be done during .the closest: refueling to .tho' 10 year ,

frequency.

16.) Equipment ID: lE51*PC003 Maintenance Task 123697, ME 03361 Frequency: ~As needed Add oil. Investigate cause of lowJoil level.

Qbservation Keep task.

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-Report No. RS-91-137 Revision 0 Page _15 of 73-17.) Equipment ID: lE51*PMC003 Maintenance Task 3638, CO 02958 Frequency: Every 24 weeks Lubricate (re-grease) motorLbearings. !

observation -

Task satisfies' requirements of EQMSR 237.160-1 .Rev. C Regreasing is conditional on! grease sample.

18.) Equipment ID: lE51*PC003 Maintenance Task. 36, ME 01554 Frequency: Every 26 weeks j Change oil and lubricate pump bearings.

Observation Recommend moving frequency to . once .per year, and combine with Task 3688, ME-01555, #19-below.

19.) Equipment _ID: lE51*PC003 Maintenance Task 3688,_ ME 01555 Frequency: EveryE52 weeks l

Lubricate coupling-per GMP-0015 and manual. i Observation

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Keep frequency, and combine' with ~ maintenance; task 36, j ME 01554, #18 above.

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Report No. RS-91-137 Revision 0 Page 16- of 73 20.) Equipment ID: 1E51*PC003 Maintenance Task 5861, MQ 00254 Frequency: During refueling Replace oil seal-coupling end, oil seal-in board end, o-ring-bearing housing, and o-ring-impeller.

Observation Recommend moving to every other refueling due to lack of problems.

21.) Equipment ID: 1E51*PMC003 Maintenance Task 272978, EL 01990 Frequency: Every 104 weeks Perform preventive maintenance per PMP-1065.

Observation-Keep task. Two year PM on motor is believed appropriate.

22.) Equipment ID: lE51*PMC003-Maintenance Task 123649, EQ 01262 Maintenance Task 245861, EO-02962 Frequency:

EQ 01262 -.Every 572 weeks-EQ 02962 - Every 577 weeks Replace motor bearings.

Observation Probably Both tasks are doing the same thing. Delete one.

should delete EQ 01262~since EQ 02962 appears to have more- ;

information.

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Report.No.- RS-91-137 Revision 0 Page 17 of 73 23.) Equipment ID: lE51*C002 Maintenance Task 36, ME 01546 Frequency: During refueling Change oil in compressor.

Observation Keep task.

24.) Equipment ID: lE51*C002 Maintenance Task 3681, ME 01545 Frequency: During refueling Lubricate coupling.

Observatioq-Keep task.

25.) Equipment ID: lE51*C002 Maintenance _ Task 1327, .ME 01544 Frequency; During refueling Inspect and clean suction'and exhaust filters.-

Observation Keep task.

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7 Report No.- RS-91-137 Revision 0-Page- 18 of 73 26.) Equipment ID Maintenance ~ Task 1E51*MOVF010 13272936 EL 01991-lE51*HOVF019 13272936 EL 01993 1E51*MOVF022 13272936 EL101994 lE51*MOVF045 13272936 EL 01996 1E51*MOVF046 13272936 EL 01997 lE51*MOVF059 13272936- EL-01998' I lE51*MOVF068 13272936 EL-02001

1E51*MOVF077. 13272936 EL 02003 lE51*MOVF078 13272936 EL 02004 Frequency: Every 78 weeks

{ Perform preventive maintenance'in accordance with PHP-1205.

4 Observation Move frequency to during refueling.

Maintenance Task 27.) Equipment ID lE51*MOVF013 13272936 EL.01992 1E51*MOVF031 13272936 EL 01995

-1E51*MOVF063 13272936 EL 01999 1E51*MOVF064 -13272936 EL 02000 1E51*MOVF076 13272936 EL102002 Frequency: During refueling a

Perform preventive maintenance in accordance with-PMP-1205.

l Observation Keep' task.

28.) Equipment ID Maintenance Task : Frequency 1E51*MOVF013 2461- EQ 02739 Eve ry -'3511 months lE51*MOVF031 .2461 EQ~02740. Every~454 months 1E51*MOVF059 2461 EQ_02741 'EveryJ351 months lE51*MOVF064 2461 EQ 02800 Every 438 months Replace o-rings and seals.

Observation Keep-task. EQ requirement.

Report No. RS-91-137 Revision 0 Page 19 of 73 29.) Equipment 1D: 151*MOVF064 Maintenance Task 24619799, EQ 02756 Frequency: Every 788 weeks Replace o-rings and seals.

l Observation ,

Keep tack. EQ requirement.

j 30.) Equipment 2D: 1E51*MOVF064 f Maintenance Task 246197, EQ 02778 3 Frequency: Every 234 months '

Replace the motor.

Observaj;,j o_n 4

Keep task. EQ requirement, i

31.) Equipment ID Maintenance Task Frequency t lE51*AOVF004 245861 EQ 02919 Undetermined lE51*AOVF005 245861 EQ 02920 -Every 243 months

, lE51*AOVF025 245861 EQ 02921 Undetermined lE51*AOVF026 245861 EQ-02922 Undetermined

lE51*AOVF054 245861 EQ 02923 Undetermined

Replace - subcomponents that have reached -the end - of their qualified life.

Observation l Keep task. EQ requirement.

32.) Equipment ID: lE51-K603 Maintenance Task 101327, EL'15135 Frequency: During refueling Clean and perform a functional check on Topaz inverter 1E51-K603 panel.

gbservation l-On 2/ll/90-Topaz inverters to H13-P618 and H13-P652 failed.

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'Rpport:Nok !RS-91-137~. .

Revision : 0- ,

Page. :

20s of-73 .

a (I VII. Surveillance- Test Procedures . y A. :

Qbservations'- General

' Identified 61. surveillance o test procedures : associated -' with L the ! RCIC ' ' system- . Six ; of Ethese~ -are concerned with the The ;

l operability of the system.--are calibration.s'checks of sensor? vast majority _(50 out'-of 6

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There are only three surveillance' test lpr_ocedures thatLhave F a significant impact:;on assuring -that the RCIC system will' work given c_ valid = demand ~ signal.- ,

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- STP-209-0201~ Checks certain valve 3 positions once a. month. ,

L STP-209-3301- Checks valve movement on cartain valves 7oncei L a quarter.

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, STP-209-3302 System- flow test; Leondensate . storage tank -

l- back . to: condensate- storage- tank _.once ~

a L quarter. >

The RCIC pump and turbine Lare rarely , checked hin a manner <

cimilar,to the demand;that-the~ system might see in the rare event that a valid. demand was _ generated ;by abnormal conditions in the plant. The norm;al: pattern is - to': schedule :

a RCIC system (outage- toward = the 3 end of _ ai: quarter, ! isolate:

l thet -RCIC l system .for fthe outage, , perform _ preventative.

maintenance tasks and .correctiveL maintenance tasks 11 during the outage, run the necessary - surveillances . at the end of the maintenance.outagerandithensput1theJRCICTsystem,backiin standby., The time - that the:;

averager aboutJ30 minutes :for pump and Jturbineeare operatedf STP-209-3302.

- A . better pattern ;would ( be :toJ run. La " slow 7:Lstart" ~ of : Lths -

pump /turbineL justn priors to theJmaintenancel outage. SuchEa; ,

l' slow' start woud : allow J one to) check 1. for fdegradediconditions;

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in lthe_. system t sincei the- last? pump /turbino L run.: ThenJoneJ l'

'could isolate c the 1 system', . performvmaintenance, - perform 1 thel

- applicable;STP's,<ard;put thensystem backlintofstandbyL JAt' f, L least 'once :a': year,. the ' pump / turbine -shouldcbei runa for t

!< approximately fourLhours.s Itl1s,recognizeds that the' longer?

L run;would' add more reactor:coolantiwaterzto.thel suppression:

poolf with 3the attendant Mincreased ? problems w withdradiation ?

i and: heat; removal.

A E network : of-- 1 sensors 'hasl been superimposef onif the ? RCICc system. - _ Theser sensorsfare designed -.topisolate L thelsystemi sgiven certain abnormal events.-

4 Duef tojthe11arge number 1 of: .

sensors, there;are a -large number ofic'alibrationichecks1 of t l

these ' sensors : (STP's) . . In most: Lcases1.theset calibration-L checks, do ' not . have .a direct impact - on thei RCIC system l

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Report No. RS-91-137 Revision 0 Page 21 cf 73 availability. However, the overall' impact of these_ . RCIC STP's has been negative.

Isolations have occurred whileL performing these calibration checks. Isolations have been mandated when the sensors fail and the sensors have to be'. repaired. There is a-trade >off-that must be made in order to keep the - conditional probability of RCIC working high while at . the same . time making provisions for piping failures in the RCIC syste.n. ,

one way to handle this trade.off (and the recommended one) is-to eliminate the isolation of RCIC given the actuation of the sensors superimposed on the RCIC system. The decision- '

to isolate the RCIC systemishould be left to- the operating crew for signals such as high ambient temperature _-in - the RCIC equipment room. This , would be very _ tough to .-implement .

because it would mean a. change in the tech specs.- It would require deletion of Table 3.3.2-1.5 Table 3.3.2-2.5 Table 3.3.2-3.5 Table 4.3.2.1-1.5 from the technical specifications. However, if implemented, the change would have-a positive impact. on the conditional probability of the RCIC system working given a valid demand. -

This must be considered-a long-term recommendation.

An interim. recommendation would be. to move _ the frequency of certain surveillances to the. values givensin Table 4. Table 4 frequency changes are based on :the adjustment history of the surveillances as given-in Table"5.

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Report No. RS-91-137 Revision 0 Page 22 .of 73 :;

B. Observations - Specific 1 1.) Most of the surveillance test procedures are calibration checks - of sensors, In most - cases these calibration checks allow two~ hours of the system'being

" inoperable" before - a formal LCO -is filed. However, some of the STP's allow only one hour.. The ones allowing one hour are STP-207-4243 RCIC Isolation -

RCIC Equipment Room Differential Temperature - High.

STP-207-4248 RCIC, RHR Isolation - Steam Line Flow -

High.

STP-207-4249 RCIC, RHR Isolation - Steam Line Flow -

High.

STP-207-4537 RCIC Isolation - Steam Line Flow'- High.

STP-207-4549 RCIC, RHR Isolation Steam Line Flow -

High.

STP-207-5252 RCIC, RHR Isolation - RHR Equipment Area Ambient Temperature - High.

A decision should be made as to how many hours the specs allow. Recommend 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

2) STP-209-4209 & Main Steam-Line Tunnel -

STP-209-4210 Temperature. Timer Quarterly Channel Calibration.

In 1986 a modification was initiated to eliminate the timers-from the logic (MR-86-0539). Work was completed on the Modification, 10/25/86, but the timer - was not eliminated from the logic. Modification must made- it easier 'to test the timer which has a zero (0).second time-delay.

Commitment 05258 still exists. This commitment indicates the timers will be eliminated and when they are, the'STP's will be deleted.

Recommend discontinuation of the STP's.

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'As indicated in the general comments, .having sensors which isolate the RCIC system is damaging to the conditional. probability of the-RCIC system working when_needed.- '

Recommend deletion of-Tech Spec Table 3.3.2-1.5 g,h,1

! Table 3.3.2 2 5 g,h,i j Table 4.3.2.1-1 5 ~g,h,i

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Report No. RS-91-137 Revision 0 Page 23 of C. Intersystem Leakace STP-209-4211 Reactor Coolant-System Interface Valve-Revision 5 Leakage Pressure-Monitor Monthly Channel: Functional 18-month Channel- Calibration' checks for leakage past E51*AOVF065, E51*AOVF066, and E51*MOVF013.

Doe n't appear to impact RCIC system availability.

No /elve Movement.

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Report No. RS-91-137 Revision 0 Page 24 of 73 D. System Operability Checks 1.) STP-209-0201 RCIC Discharge Piping Fill and Valve Revision Lineup Verification.

Once a month checks position of following key valves.

1E51*MOVC002 lE51*MOVF045 1E51*MOVF068 1E51*HYVC002 lE51*MOVF046 1E51*MOVF076 lE51*MOVF010 1E51*MOVF059 1E51*MOVF077 '

1E51*MOVF013 1E51*MOVF063 1E51*MOVF078 1E51*MOVF019 lE51*MOVF064 lE51*VF060 lE51*MOVF022 1E51*MOVF065 lE51*VF062 1E51*MOVF031 1E51*MOVF066 Doesn't have direct impact on RCIC system availability.

No valve movement.

2.) STP-209-0601 RCIC Initiation- Functional Revision 4B Checks initiation logic, both manual and automatic.

Done at least once.per 18 months with steam dome pressure greater than 150 psig.

The RCIC system will be unavailable during this test because the injection valve (lE51*MOVF013) breaker is open.-

The RCIC pump will ~ transfer water from the condensate storage tank to the suppression pool during this procedure, l

The following valves are checked for_ correct operation

during this procedure.-

i lE51*MOVC002 lE51*MOVF046 1E51*AOVF025 lE51*MOVF013 lE51*MOVF059 lE51*AOVF026 1E51*MOVF019 1E51*HYVC002 lE51*MOVF022 lE51*AOVF004 1E51*MOVF045 lE51*AOVF005 o 3.) STP-209-0602 RCIC System Flow Test Revision 4 Checks system flow when reactor pressure is 150 psig. Low i end of pressure spectrum.

Done at least once per 18 months within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months after reactor steam pressure is greater than or equal to 150 psig.

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Report No.- RS-91-137 Revision. O Page 25 of 73 The only impact on RCIC availability might come if valid signal-came in during test and some flow was diverted to CST before closing test valves.

The following valves are checked for correct operation during this procedure 1E51*MOVC002 lE51*MOVF059 1E51*VF0ll lE51*MOVF019 1E51*AOVF004 IICS*V021

-1E51*MOVF022 1E51*AOVF005 1E51*HOVF045 lE51*AOVF025 1E51*MOVF046 lE51*AOVF026 4.) STP-209-3302 RCIO Pump Operability;and Flow Test.

Revision 6 Quarterly test. Checks system flow when-reactor pressure'is 1020 psig. Checks. movement of check valves.

The only impact on RCIC availability might come if valid signal came in during test and some flow was diverted to CST before closing test valves.

The following valves are checked for ccrrect operation during this test.

1E51*MOVC002 1E51*AOVF004 lES1*VF0ll 1E51*MOVF019 lE51*AOVF005 lE51*VF040 lE51*MOVF022 1E51*AOVF025 lE51*VF061-1E51*MOVF045 1E51*AOVF026 lICS*V21 lE51*MOVF046 lE51*MOVF059 5.) STP-209-3301 RCIC Valve Operability

. Revision SA Checks valve movement for certain valves on a -quarterly -

basis to verify-ibolation times are within'11mits and valves are in correct positions. Some valves are - checked during cold shutdown because checking- during powerL operation would hinder normal operation.

The only impact on RCIC availability might- come if valid i signal in while a . valve was being ' moved. The. actual accident signal would have' to override ' the- ' local valve movement. This is. believed'to have'a very small impact on RCIC availability.

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Roport No. RS-91-137-Revision- 'O Fage 26 of 7 3 The following valves are ' checked -for -correct operation during this test.

lE51*MOVC002 lE51*MOVF063 1E51*VF079 1E51*VF081 1E51*MOVF010- 1E51*MOVF064 lE51*MOVF013 1E51*MOVF068 1E51*AOVF004 1E51*MOVF019 lE51*MOVF076 1E51*AOVF005 1E51*MJVF022 lE51*MOVF077 1E51*AOVF025 lE51*MOVF031 1E51*MOVF078 1E51*AOVF026 1E51*MOVF045 lE51*VF011 1E51*AOVF065 1E51*MOVF046 1E51*VF040 lE51*AOVF066 1E51*MOVF059 1E51*VF061 6.) STP-000-3607 Check Valves Tested per ASME XI, Revision OA Inservice' Testing by-Disassembly Checks operation of IE51*VF030 by disassembly- during j refueling. Valve 1E51*VF030 (suction from suppression pool- 1 for-RCIC pump) is not checked during any of the system flow-tests. This procedure disassembles and then-reassembles the valve in order to assure check valve movement. Indirect-tast only.

Test has no direct impact on RCIC system avaittbility.

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'eport R No.- RS-91-137-Revision 0 Page 27 of 73-E. Remote Snutdown Caoabil.1tv - Calibration Checks 1.) STP-209-4210 _RSS/RCIC System-Flow, 18-month Channel Revision SA Calibration Calibrates the- instruments used to ' control- RCIC flow when-using the remote shutdown-facility.

Doesn't have a direct impact . on RCIC system- availability.-

If a valid RCIC system start signal was generated during; this test RCIC would start ' and run. Operation . personnel would have to control RCIC flow : f rom the remote shutdown ,

area rather than from the main control room.

, 2.) STP-209-5211 RSS/RCIC Turbine Speed Revision 3A- moath Channel Calibration Calibrates the instrument used:to control RCIC turbine speed; when using the-remote shutdown-facility.

Doesn't-have a_ direct impact on RCIC . system availability._

If a valid RCIC system start signal was generated 'during. -

this test, RCIC would . start and run. Operation personnel would have to control RCIC turbine speed- from - the- remote shutdown area rather-than-from the main control room.

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k-t NO- RS-91'1 E"E ggyision 2B OI 1 Page

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STp-209 Tan s, 1.) Eevision g Functional' 1,sVT a to Uwitch to storage tank 10*

the instrumentation condenSS]gyel reaches th0 V

and calibtates from Checks up guadohen the CST water urin 9 88 RCI- 'sion PD ,

atlabi closed 1 i vel " impact RCI *{0,y010 U Wi d RCIC 5 ould C*

lE Doesn t directlY og th*8 -

test " If a V tOBCIC pumphe CST

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' 11 be 0 3 tim 0 ' a er than OU SS;;y *"L're'ts *a*#3aai " " ont '1eTank Condens"'0#1v *'

suction O RCIC Actua,i,n, Low.

LSPT 6 ~

2.) 3 yi ion 5 gg. mon P001 *"1g month C '

3o BCIC ' 6VEEgonthlY CHWU 37p-209-4206 Hi9 h*

3.) gevision 7g ig-m00th LS water gevel -

Eo SuppressiOUCHFonct, 18-80"th CBCAL<

RCIC gonthlY

' 37p-209 420' gigh. ggyt NO

4) yg. mon as 9,y,).

Revision 5 y,4, y.2., F.3*(lability-comments app Y l tem ava l

direct impact 0n RCIC SYS i

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e y Roport.No. 'RS-91-137:

Revision 0.

Page- 28 of 73 F. Pump Suction Switchover - Calibration ChecjLs.

1.) STP-209-4204 RCIC Actuation - Condensate Storage Revision 5 Tank Water. Level - Low.- Monthly. Channel Functional, 18-month CHCAL, 18-month LSFT Checks and calibrates the- instrumentation used to switch 4

RCIC pump suction from condensate storage tank to-4 suppression pool when the CST water level reaches the low level setpoint.

I Doesn't directly impact RCIC system avail' ability. During a

portion of this test- 1E51*MOVF010 will- be closed and lE51*MOVF031 will be= opened. If-- a valid RCIC start : signal was generated. during t h i s -t i m e ., t h e RCIC pump would draw-i suction on the suppression pool rather than on the CST.

2.) STP-209-4205 RCIC Actuation - Condensate Storage Tank Revision 5 Water Level -

Low. .

Monthly CHFunct,

18-month ~ Cal, 18-month LSPT i

3.) STP-209-4206 RCIC - Suppression Pool Water Level'-

Revision 7A High. Monthly'CHFunct, 18-month CHCAL, 18-month LSFT'

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STP-209-4207 4.) RCIC - Suppression Pool Water Level -

Revision 5 High. - Monthly.CHFunct, 18-month CHCAL, 18-month;LSFT f Same comments apply F. 2. , F.3., ' and ' F . 4' . L as ' F .1. ) '. No.

direct impact on RCIC system availability.

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Report No. RS-91-137-Revision 0 i Page H2 9 - of 73 !

G. RCIC Pump / Turbine Self Protection - Calibration Checks 1.) STP-207-4811 RCIC Isolation - RCIC Steam Line_ Flow--

Revision 5 High. 18-month response time test

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Closes 1E51*MOVF064 for test.

2.) STP-207-4812 RCIC Isolation - RCIC Steam Line Flow -

Revision 5 High. 18-month response time test.

Closes 1E51*MOVF063 for test.

Both of these tests mako the--RCIC system unavailable because the steam supply to the RCIC turbine is closed off. -Testing is normally done just before going into refueling.

3.) STP-207-4538; RCIC Isolation - RCIC Steamfjupply-Revision 31 Pressure - Low. 1 Monthly r funct.

4.)- STP-207-4539 RCIC Isolation'- RCIC Steam Supply!

Revision 1 Pressure - Low. : Monthly CHFunct.

5.) STP-207-4238 RCIC Isolation 1- RCIC Steam-Supply Revision 5 Pressure - Low. 18-month CHFunct and 18-month LSFT.

6.) STP-207-4239 RCIC Isolation --RCIC Steam Supply Revision-5 P r e s s u r e - ---- L o w . 18-month CHFunct' and 18-month-LSFT.

7.) STP-207-4813 - RCIC Isolation _- RCIC Steam Supply l Revision SA Pressure - Low. 18-month: response time, ChannellA.

8.) STP-207-4814 'RCIC isolation - RCIC Steam. Supply-Revision 4A Pressure - Low. - .18-month response time, Channel B.

9.) STP-207-4294 RCIC Isolation:- RCIC Steam Line Flow -

Revision 5 High. Timer-Quarterly CHCAL.

10.) STP-207-4295 RCIC Isolation - RCIC Steam-Line Flow -

Revision 5 High. Timer Quarterly CHCAL. =-

11.) STP-207-4536- RCIC Isolation - RCIC-Steam Line Flow -1 Revision 1 High. : Monthly CHFunct.

~12.) STP-207-4537 RCIC Isolation .'CIC Steam Line Flow -

. Revision 2A High. Monthly CHFunct.

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Report:No. RS-91-137 Revision 0 Page 30 of 73 13.) STP-207-4236 RCIC Isolation - RCIC Steam Line Flowi- --

Revision 7 High. 18 -

month CHCAL and 18-month LSFT.

14.) STP-207-4237 RCIC Isolation - RCIC Steam Line Flow -

t Revision 6A High. 18-month CHCAL and 18-month LSFT.

15.) STP-207-4548 RCIC, RHR Isolation - RCIC Steam Line Revision 3 Flow - High. Monthly CHFunct.

16.) STP-207-4549 RCIC, RHR-Isolation'- RCIC Steam Line Revision 1 Flow - High. Monthly CHFunct.

17.) STP-207-4248 RCIC, RHR Isolation'- RCIC Steam Line Revision 8 Flow - High, 18-month CHCAL and 18-month-LSFT.

18.) STP-207-4249 RCIC, RHR Isolation - RCIC Steam Line Revision SA Flow - High. month CHCAL and 18-month LSFT.

19.) STP-209-4201 RCIC Isolation --RCIC Turbine Exhaust Revision 6 Diaphragm Pressure .High.

Monthly CHFunct, 18-month CHCAL, 18-month LSFT.~

20.) STP-209-4202 RCIC Isolation - RCIC Turbine Exhaust Revision 7 Diaphragm Pressure - High.

Monthly CHFunct,-18-month CHCAL; 18-month:LSFT :

21.)'STP-209-5201 RCIC Isolation 'RCIC Turbine Exhaust Revision 7 DiaphragmLPressure - High.

Monthly CHFunct, 18-month CHCAL, 18-month LSFT 22.) STP-209-5202 RCIC Isolation -- RCIC Turbine Exhaust l Revision 6 Diaphragm

Pressure -High..

Monthly- CHFunct, 18-month CHCAL 18-month--LSFT.

The 20 surveillances ;11sted above -(E.3. through .E. 22. ) - do E not directly impact RCIC system availability.- They'also do '

not cause'any valve movement'in the RCIC system.-

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Report'No. RS-91-137 Revision 0 Page 31 of 73 H. RCIC Pipe Leakaae/Runture PLotection - Calibration Checks 1.) STP-207-4240 RCIC Isolation .-RCIC Equipment Room Revision 6B Ambient Temperature - High.

Monthly CHFunct, 18-month CHCIL, 18-month LSFT The monthly CHFunct and the 18-month - LSFT have no direct impact on RCIC system availability.. The 18-month CHCAL opens the circuit breakers for lE51*MOVF064 and lE51*MOVF031. This does not - directly- -impact RCIC system availability because 1E51*MOVF064 is normally open and will stay open when the circuit breaker .is opened, lE51*MOVF031 is normally closed and cannot be opened until the circuit breaker is racked back in. Therefore, the RCIC pump cannot take suction from the: suppression nool while the breaker ~is open. The normal RCIC pump suctit.a is . from the condensato storage tank; tho ' suppression pool is backup. Also get' movement of lE51*MOVFC002 during 18-month CHCAL.

2.) STP-207-4241 RCIC Isolation - RCIC Equipment Room Revision 7 Ambient Temperature - High.

Monthly CHFunct, 18-month-LSFT.

The monthly CHFunct and the 18-month LSFT have no direct impact on RCIC system availability. The 18-month CHCAL opens the circuit breakers for lE51*MOVF063 and 1E51*MOVF076. Thia does not directly impact RCIC ' system availability because lE51*MOVF063 is normally open and will stay open when -the circuit breaker- is racked out. ,

lE51*MOVF076 is normally closed .and will stay closed, lE51*MOVF076 is not necessary for RCIC operation. .It;is the bypass line valve around lE51*MOVF063 and used to warm up the RCIC steam-supply'line if lE51*MOVF063 had been-closed.

Also get movement of-1E51*MOVC002 during 18-month CHCAL.

3.) STP-207-4242 RCIC Isolation - RCIC Equipment Room ,

Revision 6A Differential Temperature - High. '

Monthly CHFunct, 18-month CHCAL, 18-month LSFT.

4.) STP-207-4243 RCIC-Isolation - RCIC Equipment Room l Revision 7A Differential Tempercture - High.

Monthly CHFunct, 18 .unth CHCAL 18-month LSFT.

5.) STP-207-5252 RCIC, RHR Isolation - RHR Equipment Area Revision 7A Ambient' Temperature - High.

Monthly CHFunct, 18-month CHCAL, 18-month LSFT.

Report No. RS-91-137 Revision 0 Page 32 of 73 6.) STP-207-5253 RCIC, RIIR Isolation - RilR Equipment Area Revision 7 Ambient Temperaturo - High.

Monthly CliFunct,18-month CllCAL, 18-mon:h L3FT.

7.) STP-207-5254 RCIC, RHR Isolation - RHR E Revision 6 Ambiont Temp 2,raturo - liigh.quipment Area Monthly CllPunct, 18-month CIICAL, 18-month LSFT.

8.) STP-207-5255 RCIC, Rl!R Isolataon - RilR-Equipment Area Revision 5 Ambient Temperaturo - liigh.

Monthly CliFunct, 18-month CliCAL, 18-month LSFT.

9.) STP-207-5248 RCIC, RilR Isolation - RIIR Equipment Area Revision 5 Differential Temperaturo .liigh.

Monthly-Cl!Punct, 18-month CllCAL, 18-month LSFT. .

10.) STP-207<'a49 RCIC, RIIR Isolation --RIIR Equipment Area '

Revisio..' Differential Temperature - liig n.

Montbly CHFunct, 18-month CllCAL 18-raonth LSFT..

11.) STP-207-5250 RCIC, Ri!R Isolation - RilR Equipment' Area Revision 3 Differen-tial Temperature. liigh.

Monthly Cl!Punct, 18-month CHCAL.

18mmonth LSPT.

12.) STP-207-5251 RCIC, RilR Isolation - RlIR Uquipment Area Revision 3 Differential Temperaturo - 111g.1. -

Monthly CHFunct, 18-month CHCAL-Lla-month LSFT.

13.) STP-207-4501 bSSS/RWCU/RCIC Isolation - Mall Steam Revision 2 Line Tunnel Ambient Temperatu a - liigh.

Monthly CHFunct.

14.) STP-20~-4502 NSSS/RWCU/RCIC Isolation -'Hain' Steam Revision 2 Lir;o Tunnel Ambient Temperature - liigh.

Mcnthly CHFunct..

15. ) STP-207-4209 MSL Tunnel Temperature = Timer Quarterly' Revision 5 CHCAL.

16.) STP-207-4210 MSL Tunnel-Temperature Timer Quarterly Revision 5. CHCAL.

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i' Roport No. RS-91-137 ,

Revision 0 i Pago 33 of 73 ,

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i 17.) STP-207-4201 NSSS/RWCD/RCIC Isolation - Main Steam i 1 Revision 7 Lino Tunnel Ambient Temperature - liigh. ;

18-month CllCAL, 18-monti LSFT. ;

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18.) STP-207-4202 'NSSS/RWCU/RCIC Isolation - Main Steam Revision 8 Line Tunnel Ambient Temperature - liigh. >

18-month CllCAL, 18-mont.1 LSFT.

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! 19.) S*P-207-4205 NSSS/RWCU/RCIC Isolation - Main 3toam I Revision 7A Lino Tunnel Differential Temperaturo -

! High Monthly Citrunct,18-month CitCAL,

10-month LSFT. ,

1 20.) STP-207-4206 NSSS/RWCU/RCIC Isolation - Main Steam Sovision 7 Line Tunnel Differential Temperaturo -

4 liigh. Monthly CliFunct,18-month CliCAL, i 18-month LSFT. ;

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Report No. RS-91-137 Revision 0 Pago 34 of 73

1. Ip_olation-v alve Tp_sts 1.) STP-219-0603 RCIC Manual Isolation Functional Test Rovision 2 Performs a Channel Functional Test (CHFunct) and logic System Functional Test (LSFT) of the RCIC manual isolation actuation.

Dono during modes 4 or 5 only. Steam linos to RCIC turbino must be drained of all water. RCIC isolated.

The following valves change position during this tost:

1E51*MOVC002 1E51*MOVF045 1E51*MOVF077 1E51*MOVF010 1E51*MOVF063 1E51*MOVF078 2E51*MOVF013 1E51*MOVFC64 1E51*MOVF031 1E51*MOVF076 2.) S*P-209-3603 RCIC Pressure Isolation Valve Leakago Revision 3 Test Leak test of IE51*MOVF013 dono during refueling.

Nr act on !1CIC system availability.

3.) STP-209-3807 Reactor head Spray Valve Leak Rate Test Revision 3 i

Leak rate test of IE51*AOVF066, 1E51*A0VF065, and 1E51*MOVF013 dono during refueling.

No impact on RCIC system availability.

4) STP-209-3818 RCIC Valve Leak Rato Test (Air).

Revision 2 Leak rate test of 1E51*MOVF063, 1E51*MOVF064, 1E51*MOVF068, l 1E51MOVF076, 1E51*MOVF077, 'and 1E51*MOVF018 done during refueling..

t_ No impact on RCIC. system. availability.

l 5.) STP-209-3834 'RCIC Valve.!aotik Rate Test (Water)

Revision-3 Leak rate test of IE51*MOVF019 and 1E51*MOVF013 done during l

. refueling.

No impact on RCIC system availability ~.

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Report No- RS-91-137 Revision 0 Page 35 of 73 J. ASME Section XI Relief Valve Testirig STP-000-3606 Section XI Safety and Rollof Valvo Testing Revision 4A Test set pressure of relief valvo 1E51*RVF018. Not sure that 1E51*RVF017, 3E51*RVF090, and IICS*RV130 are covorod.

No impact on RCIC system availability.

R0 port No. RS-9 5137 Revision 0 Page 36 of 73 VIII. Recommendations The most beneficial change that can be made to enhance the reliability of the RCIC system is to change the way the pump /turbino is started. The start should be a slow gradual admission of steam to the turbine and a slow, steady increase to full flow. The present start cyclo results in the most probablo failuro modo being the overspood trip of the turbine. This is one of the most damaging failure modos because in order to restore the RCIC turbine to service, an operator must be sont to the RCIC turbine room to manually reset the overspoed trip.

The justification for a slow start of RCIC is operating experience. Boiling Water neactor plants roly on the foodwater system to provido water to the reactor vessel in both normal and abnorttal events. This is the preferred method and. tho method actually used in the plants. It is only in highly unlikely evente (which take -time to develop) that the plants need emergency water supply.

It should be recognized that changing to a a slow start" of the RCIC system represents a major change. Changes in the technical specifications are involved. Approval from the NRC must be granted. This should be a "long term" recommendation.

Ono posalblo way to have a slow start might be to chango the valving arrangement such that 1E51*MOVF045 is normally open and 1E51*MOVF063 and 1E51*MOVF064 are normally. closod.- Then. a mechanism for slowing warming up the RCIC lino from valvos MOVF063 and MOVF064 to the turbine and for slowly opening valvos 1E51*MOVF063 and IE51*MOVF064 would have to be devised given a valid demand on RCIC.

By changing the normally closed valvo_ from 1E51*MOVF045 back to 1E51*MOVF063 and 1E51*MOVF064, River Bend might- gain the following advantages.

1.) Thormal officiency of the reactor is improved'.

2.) Radiation exposure in_the auxiliary bellding:is reduced.

3.) Potential for high energy pipo lock or break is reduced.

4.) Might be able to eliminate sensors which isolato-RCIC given-a RCIC steam lino leak .or break -(e.g., steam tunnel ~

l temperature, RCIC equipment room temperature, ~ otc. ) - because the RCIC steam line is now no longer a high energy-line past-l_ '

the isolation valves. This would eliminato a-large number of surveillance test procedures.

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- RCport N9.; RS-91-137'

- Revision' O Page- 37 of 73-Other schemes to have a: slow start of the RCIC. turbine'are also possible and should be -investigated.- The key wili. be to' change

<:.o a start mechanism that = will.~ enhance the probability - of > the RCIC pump / turbine starting andl running for 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months given a valid l demand.

Other recommendations appear.in section-VI and-Section VII.

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Roport No. RS-91-137 Revision 0 Page 38 of 73 IX. References 1.) Control Room Log, January 1, 1988 through June 30, 1991.

2.) Clearances on RCIC system equipment, January 1, 1988 through June 30, 1991.

3.) Limiting Condition of Operation on RCIC system equipment, Jenuary 1, 1988 through June 30, 1991.

4.) Condition Reports on RCIC system equipmont January 1, 1980 through June 30, 1991.

5.) Maintenance Work Ordors on RCIC system equipment January 1, 1988 through June 30,-1991.

Roport No. RS-91-137 Revision 0 Pago 44 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE Maintenanco Outages During Power Operction January 1, 1988, to June 30, 1991 3/1/88 -

23 hours2.662037e-4 days 0.00639 hours 3.80291e-5 weeks 8.7515e-6 months 4/4/08 -

45 hours5.208333e-4 days 0.0125 hours 7.440476e-5 weeks 1.71225e-5 months 6/14/08 - 9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months 9/8/88 -

48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months 12/5/88 - 34 hours3.935185e-4 days 0.00944 hours 5.621693e-5 weeks 1.2937e-5 months 1/23/89 -

69 hours7.986111e-4 days 0.0192 hours 1.140873e-4 weeks 2.62545e-5 months

-3/5/89 -

53 houra 3/14/89 -

24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months 9/26/89 -

37 hours4.282407e-4 days 0.0103 hours 6.117725e-5 weeks 1.40785e-5 months 12/29/89 - 26 hours3.009259e-4 days 0.00722 hours 4.298942e-5 weeks 9.893e-6 months 4/23/90 -

25 hours2.893519e-4 days 0.00694 hours 4.133598e-5 weeks 9.5125e-6 months 5/20/90 -

57 hours6.597222e-4 days 0.0158 hours 9.424603e-5 weeks 2.16885e-5 months 7/16/90 -. -74 hours.

8/14/90 -

96' hours' 9/13/90 -

24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months

.3/21/91 -

46' hours 6/19/91 -

30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months is _

a

r-Report No. RS-91-137 Revision 0 Pago 45 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE 3/1/88 - 23 hours2.662037e-4 days 0.00639 hours 3.80291e-5 weeks 8.7515e-6 months 1.) HWP514886 E51*TC002 ME 03074 Cleaned and lubricated all external linkages. No discrepancies noted.

2.) MWR119867 E51*TC002 Flange leak on casing. Torqued bolta._Still_small_ amount of leakage.

Report No. RS-91-137 Revision 0 Page 46 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE l-4/4/08 - 45 hours5.208333e-4 days 0.0125 hours 7.440476e-5 weeks 1.71225e-5 months 1.) HWPS16289 E51*LSNO37 IC 08461 Inspected switch. Found within calibration. Roplaced o-ring.

2.) MWPS16410 E51*LSN010 IC 08460 Inspected switch. Found within calibration. Replaced cover o-ring.

3.) MWPS16737 E51*TC002 ME 03174 Inspected gears and bushings of turbino. No signs of abnormal wear.

4* MWPS16739 E51*C002 HE 01546 Changed oil on both bearings.

5.) MWP 516740 E51*C002 ME 01545 Lubricated coupling. Checked alignment.

6.) MWP516741 E51*C002 ME 01544.

Inspected suction and discharge filters. Satisfactory.

7.) MWP516769 E51*PC003 ME 01554 Changed oil.

,,.-y-egy--- ,- - ge--ga-y7*s ~+e-way 4 w- p-o--w >>ste y e re-'-

r --

l Report No. RS-91-137 Revision 0 Page 47 of 73 TABLE-1 RCIC MAINTENANCE OUTAGE ,

6/14/88 - 9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months 1.) MWP518154 E51*TC002 ME 03074 Lubricated governor. Checked valvo stroko and spring tension.

2.) MWR115801 E51*VT047 -

Frequent alarm on E51*LSNO37 indicatos rostriction in lino.

Removed valvo cover, inspected valvo, found no problems, roassembled valvo.

3.) MWR116813 E51*TC002 Small oil look on west sido of covernor actuator. Disassembled tubing fitting. Reassembled using never scizo compound.

l w 9 -V wr e d ig =+-wegt e

Rcport No. RS-91-137 Revision 0 4 Page 40 of 73 i TABLE 1 l RCIC MAINTENANCE QUTAGE I

9/8/88 - 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months 1.) HWPS20929 E51*LSN010 IC 08460 Hooked up test rig for lovel switch. Checked levol in chamber.

Verified SOV for AOVF054 operator. Performed PM's.

2.) MWPS20930 E51*LSNO37 IC 08461 Calibrated level switch in accordance with MCP-4051. Had to mechanically agitate float chamber to get it to respond. ,

Replaced gaskot on switch cover.

3.) MWP520945 E51*TC002 HE 03192 i Drew oil sample. l 4.) MWPS20946 E51*TC002 ME 03074 .

Cleaned and lubricated external linkago. All linkages appear to movo frooly. Governor valvo stroko is 7/8". Verified propor spring tension.

5.) MWP521130 E51*PC003 ME01554 Changed oil.

6.) MWP521131 E51*PC003 :ME 01555 Lubricated coupling por GMP-0015. -Found no looso bolts or leaking seals. ,

7.) MWPS21132 E51*TC002- HME 03174 Inspected gears, shaft bushings, thrust washer, angle drivo assembly. No abnormal wear or indications of lack of -lubricant. i Sheared off dowel pin from bearing end cover during removal.

MWR120014 written to fix.

8.) MWP521133 ES1*C002 ME 01544 Inspected filters and mufflor. Do not require cleaning or changing.

9. )- MWP521134 E51*C002 _ ME 01545 Groaned coupling. Chocked alignmant,_found-to be OK.

10.) MWP521150 E51*TC002 Sampled _ oil (ME 03192, Task 0334) and forwarded to chemistry. ' '

No. ,

discropancies found.

11.) MWR112329 ICS-PI167 Removed broken guage on gland seal compressor. -Installed and j calibrated new guage.

l l

l ,

c._,. .. . . ,,;--+-,. . ,. . - - _ _ . - .-

l Roport No. RS-91-137 I Revision 0 Pago 49 of 73 !

TABLE 1 RCIC MAINTENANCE OUTAGE l 9/8/88 - 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (continued) 12.) MWR116799 ICS*V61 Packing blowing some steam. Tightened backing. No new packing needed.

13.) MWR117834 E51*V308 .

Valve rotates on line. Removed valvo. Reinstalled with small amount of pipe dope on threads.

14.) MWR117874 E51*LSNO37 Mounting plate base and switch assembly can rotate. Tighten sot-scrOWs on base.

15.) MWR118184 E51* ROD 004 Frequent alarm on E51*LSNO37 indicates plugging of orifice.

Checked line. No plugging. Suspect problem may be la check valve.

.- . , . , ~ , - - , , . . , _ . , , , _ . . . . -,.._c,, . ; .. - , - . . .-.,m_,-. ,.

f l

l I Roport 11o. RS-91-137 l Revision 0 i Page 50 of 73 I

TABLE 1 l

RCIC MAINTENANCE OUTAGE l

l ,

! 12/5/88 - 34 hours3.935185e-4 days 0.00944 hours 5.621693e-5 weeks 1.2937e-5 months i l

l 1.) MWP523274 E51*TC002 1 l Cancelled ME 01552. l l 1 2.) MWP523275 E51*TC002 ME 01557 (now ME 01549) l Drained oil from cooler and sump at roar of turbino. Changed oil !

and filters.

l 3.) MWP523354 E51*PC001 ME 01557 l Drained oil from outboard and inboard bearings. Changed oil.

4.) MWP523355 E51*PC001 ME 01556 Grease coupling. All four 1/8" pipo plugs stuck. Droke coupling

, loose. MWR128050 written.to drill out and replaco 1/8" plugs.

l 5.) MWP523593 E51*TC002 ME 03074 Cleaned and lubricated 11.nkage on governor valvo.

6.) MWE518821 E51*AOVF025 IQ 00787 l Replaced diaphragm. '

I 7.) MWE522300 E51*PC003 EQ 02958 Lubricated motor bearings.

8.) MWE518900 E51*AOVF026 20 00788 Installed now diaphragm. Torquod tolts.

^

9.) MWP523767 E51*TC002 ME 03192 Took oil sample to chemistry.

10.) MWR129327 ICS*V58 Packing leak.- Tightened packing gland follower nuts.

l 11.) MWR129528 ICS*V61 Packing leak. - Tighten packing gland follower nuts.

t

,, _._ ,. . . ~ _ _ . . -

Report No. RS-91-137 Revision 0 Page 51 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE 1/23/89 - 69 hours7.986111e-4 days 0.0192 hours 1.140873e-4 weeks 2.62545e-5 months 1.) MWP523893 E51*PC003 HE 01554 Changed oil.

2.) MWP524704 ILICS.025 IC 04660 Performed MCP4000 using LCR1ILICS.025 device calibration. Found lift off and stroke at 3 psi and 19 psi respectively. Adjusted bench set as required. All are now satisfactory. Cycled gov. as required with satisfactory results. .

l 3.) MWP527267 E51*TC002 HE 03074 Checked and cleaned linkage and spring. No discrepancy noted.

]

i 4.) MWP527269 E51*TC002 HE 03192 Took oil sample.

5.) MWP527270 E51*C002 .ME 01544 Checked muffler, checked intake & exhaust filters, satisfactory.

No discrepancies noted.

6.) MWP527271 E51*C002 ME 01545 Lubed coupling. Checked coupling alignment. Satisfactory. Took oil sample and delivered to chemistry.

7.) MWP527272 E51*C002 ME 01546 Changed oil.

8.) MWP527365 E51*C002 EL 01988 Performed PMP-1067 and GMP-0015. All data was acceptable.

Cleaned motor. No loose connections. Meggered motor. Took i

vibration and-running current readings. All readings were acceptable. No lubrication'was necessaryfper GMP-0015.

9.) MWE526338. E51*LSNO37. 10'00178 4

Attempted to' check calibration.: Switch was found'in the open position (de.cner). Filled top of switch chamber to' overflowing into drain-pot, but switch never changed state. Wrote _MWR110966 to investigate.

Flushed _the-switch several times.- Got switch to actuate. -The reset valvo'was outlof tolerance and MCP-4051 does not" allow-this

. adjustment.: . Generated MWO110969 to' investigate /recalibrate-as

. necessary. Generated HWO110967 to-replace'thetflex-conduit on-the switch.- Performed-MCP4051.

Report No. RS-91-137 ;

Revision 0 Pago 52 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE 1/23/89 - 69 hours7.986111e-4 days 0.0192 hours 1.140873e-4 weeks 2.62545e-5 months (continued) 10.) MWE526436 E51*LSN010 10 00177 Set up tout equipment. Had difficulty getting switch to actuate.

Ran lovel up and down several times, switch began to work. Trip and reset valves were within tolerances. Replaced the 0-ring.

Generated MWO110968 to replace the flox conduit on the switch.

Performed MCP4051.

11.) HWRi?8414 DTM*V58 RCIC stoam supply drain pot line drain has leak. Roplaced packing rings.

12.) MWR129300 ICS*V352 RCIC steam supply drain pot LS-N010 isolation valve blowing steam. Replaced packing rings.

13.) HWR129570 E51*AOVF025 Valve *111 not stroko fully closed. Calibrated-por PM MWP524704 and LClu . .ICS . 0 2 5. Stroko now satisfactory.

14.) MWR128460 E51*AOVF026 Valvo packing blown out. Removod actuator. Installed now packing set in stuffing box. Reinstalled.

l i

_ . - .- - . -. . .-. ._, - - --.>.w

Report No. RS-91-137 Revision 0 Pago 53 of 73 TABLE 1 l RCIC MAINTENANCE OUTAGE 1 3/5/89 - 53 hours6.134259e-4 days 0.0147 hours 8.763227e-5 weeks 2.01665e-5 months 1.) MWP524063 ILICS.022 IC 04467 i Performed loop calibration on E51*PT007. Satisfactory. l 2.) MWP524661 E51*HOVF022 EL 01994 Performed PHP-1205.

3.) MWP524663 E51*HOVF045 EL 01996 Performed PMP-3205.

4.) MWP528686 E51*TC002 ME 03192 oil sample. Added oil.

5.) MWPS24659 E51*HOVF010 EL 01991 Performed PMP-1205.

)

a f ---

s y s oh-- 's_ --

f Report No. RS-91-137 Revision 0 Page 54 of 73 TABLE 1 RCIC HAINTENANCE OUTAGE 3/14/89 - 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months Uncouple RCIC turbine / pump to perform overspeed test TSP-0010.

1.) MWR112341 Turbine failed overspeed test.

2.) MWP524659 E51*MOVF010 EL 01991 Performed PMP-1205. . No lube required. Lugs inspected.

Satisfactory.

3.) MWR127166 E51*MOVC002 ..

RCIC governor valve appeared to be sticking, sluggish during overspeed test. Prepared MWR124615.

n

l Report No. RS-91-137 i Revision 0 l Pago 55 of 73 TABLE 1 :

RCIC MAINTENANCE OUTAGE t

9/26/89 - 37 hours4.282407e-4 days 0.0103 hours 6.117725e-5 weeks 1.40785e-5 months :

1.) MWP527413 ILCS.015 IC04462 ;

Performed MCP 4001 witi, sat 'esults.r Cleaned each device. ;

2.) MWP533360 E51*PC003 ME 01555 $

Grossed coupling. Checked for looso_ screws & bolts.

Satisfactory. ;

i 3.; MWP533442 E51*TC002 ME03074-Cleaned and lubricated linkages.. Checked governor valvo stroko.

Checked propor spring tonsion. -

4.) MWP533537 E51*PC003 ME 01554 Changed oil. !

5.) MWP534181 E51*PC001 ME 01556. .

Lubricated coupling. Checked-for leaks, 1o000 bolts, etc. None ;

found. ',

6.) MWP534182 E51*PC001 ME 01557 Changed pump bearing oil. .

7.) MWR131833 ICS*V61 Packing leak. Adjusted packing.

8.) MWR131858 E51*TC002 Added oil to turbine. !

9.) MWPS27485 . ILICS.016 IC 04463 Performance of.this PM will causo E51*MOVF019 to-open.which

causes the suppression pool level to riso. Need to-chango PM to lift leads on relay E51-K73A. Performed loop calibration.

MCP-4001.

Satisfactory.

10.) MWPS33441 E51*TC002 ME 03192~

Obtained oil sample.

t 4

Rcport No. RS-91-137 .

Revision 0 l Pago 56 of 73 ;

TABLE 1 RCIC MAINTENANCE OUTAGE i

12/29/89 - 26 hours3.009259e-4 days 0.00722 hours 4.298942e-5 weeks 9.893e-6 months 1.) MWP536822 E51*PC002 ME 01546 Changed oil, gland soal compressor.

4 2.) MWR132279 E51*PC003 (Should be MWP)

Changed oil. Took sample to chemistry.

3.) MWR132280 E51*PC001 (Should be MWP)

Changed oil and_took sample to chemis'ry, e

h L

---r, v - ----a ,

, ,. s re-<. -,, y . - -

e p ~ -

Roport No. RS-91-137 Revision 0 Pago 57 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE 4/23/90 - 25 hours2.893519e-4 days 0.00694 hours 4.133598e-5 weeks 9.5125e-6 months i 1.) MWE538386 Eb PMC003 EQ 02958 Lubricated motor. ;

2.) MWE539837 E53 *; TN007 EO 01537 Performed loop chock. LCR IILICS.022. One point was out.

Performed calibration of 1ECS-PI602 per-MCP4000. Adjusted tho zero. Calibration satisfactory.

3.) MWP539040 E51*TC002 HE 03074 Cleaned and lubricated all external-governor and control linkage.

Chocked governor valvo stroke, satisfactory. Vorified propor spring tension, satisfactory.

4 4.) MWP539311 E51*PMC003 EL 01990 3 Performed PMP1065.

5.) HWR056530 E31*ESN684A-1 Unable to calibrato during STP-207-4248. Tried again with l acceptablo results.

i 6.) HWR130383- ICS-RV159 i 011 leak. Put pipo scalant compound on cap threads. There was-

j. no gasket for cap.

! 7.) MWR135962 ICS*V58

! Packing-leak. Installed now packing.

t i i I

[. .

n' , . - - - - _ _ - - - - - - - . - - - - -.._.___..--__-_---._--__:-._..--.-__--__-.

Report No. RS-91-137 Rovision 0 Pago 5B of 73 TABLE 1 RCIC MAINTENANCE OUTAGE s/20/90 - 57 hours6.597222e-4 days 0.0158 hours 9.424603e-5 weeks 2.16885e-5 months 1.) MWR112346 1E51-P1175 Broken guage.= Replaced with now guage.

2.) MWR112347 1E51-PI176 Broken guage. Replaced-with new guage.

i

Report No. RS-91-137 l H

Revision 0 Page 59 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE 7/16/90 - 74 hours8.564815e-4 days 0.0206 hours 1.223545e-4 weeks 2.8157e-5 months 1.) MWP541658 E51*PC003 ME 01554 Changed oil.

2.) MWP541954 E51*TC002 HE 03074 Linkage movement sat. Governor valve stroke sat. Spring tension sat. Linkage was well lubricated.

1.) MWR137996 ICS-RV159 Installed gasket which was missing, e 4.) MWR138201 ICS*V61 Packing leak. Repacked valve.

5.) MWR138309 E51*RVF018 Installed new relief valvo.

1 Report No. RS-91-137 !

Revision 0 Page 60 of 73 TABLE 1 i-RCIC MAINTENANCE OUTAGE 1 l

i i

- 8/14/90 - 96 hours0.00111 days 0.0267 hours 1.587302e-4 weeks 3.6528e-5 months -

i l 1.) MWP541979 E51*C002 ELO1988

Performed inspection por PMP1067. No grease needed at this timo.

, 2.) MWE541927 E51*PMC003 EQ 02958 Checked lubrication. No need to lubricato.

l 3.) MWE542273 E51*LSNO37 IQ 00178 '

Couldn't check.

4 4.) MWE542337. E51*LSN010- IQ 00177 The two micro switches on E51*LSN010 were a little discolored. <

Manually manipulated the switch to make valve-E51*AOVF054 stroke.-

Checked with operations to verify annunciator and valvo-indication. i 5.) MWR138083 E51-A-K66

. Installed new relay in accordance with MR86-1020. - Time delay' relay.

6.) - MWR138085 E51A-K72 Installed new relay in accordance with.MR86-1020. Time delay relay.

I 7.) MWR138086 E51A-K86

- Installed new relay in accordance with MR86-1020. Time delay relay, t

e * - - * .- -,.--w -

. . . - . - , ~ - c .-y s o e ~--e#4 ---wrw v., r m --# -=- ---

Nw-

l Report No. RS-91-137 )

Revlakon 0 i

Page 61 of 73 ,

TABLE 1 ;

RCIC MAINTENANCE OUTAGE i

9/13/90 - 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months System tagged out to support STP-209-3884 for LLRT of E51*WOVF031 and E51*WOVF019. LCO 90-523. Clearance 90-1220 D

P I

t wewnn :- ,

- e h~ r' t - , , - , .,,, _ , r ..,

Report No. RS-91-137 Revision 0 Page. 62 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE 3/21/91 - 46 hours5.324074e-4 days 0.0128 hours 7.60582e-5 weeks 1.7503e-5 months 1.) MWP548961 E51*TC002 ME 01549 Changed oil and filters.

2.) MWP548377 E51*TC002 M9 03074 Cleaned governor externals, cheux governor movement,.

greased external linkages. Valve stroke (sat). Valve spring coil gap (sat).-

3.) MWP548376 E51*TC002 ME 03192 Added 3 quarts oil. Ran " slow". Took oil sample.

4.) MWP546842 E51*PC001 ME 01557 Changed oil.

F.) MWR143620 ICS*TS152 Oil leaking around temperature sensor. Removed temp.

element well from pipe and cleaned. Applied PST to threads and reinstalled. Sat.

6.) MWR142965 7.) MWR132053

- _ __ _ _ _ A

[

l Report No. RS-91-137 Revision 0 Page 63 of 73 l

TABLE 1 l l

RCIC MAINTENANCE OUTAGE 6/19/91 - 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months 1.) MWP550231 E51*TC002 ME 03074 Cleaned and lubricated all external governor controls and linkage. Checked governor valve stroke (sat).

Checked spring tension (sat).

2.) MWE549991 E51*LSNO37 IQ 00178 Checked annunciator actuation (sat). Observed valve AOVF005 switch action.

No problems found. l J

3.) MWE550078 E51*LSN010 10 00177.

Manually manipulated E51*LSN010. -Observed proper operation of-valve E51*AOVF054 and annunciator operation.

4.) MWP545890 ILICS.034 IC 04479 Observed proper valve operation.

5.) MWP545847 ILICS.035 IC 04480 Observed proper valve operation.

6.) !?WP545883 ILICS.040 IC 04485-Removed switches to I/C shop. Calibrated per MCP-4000.

Loop chet:k por MCP-4001. Returned to service.

7.) MWP545867 ILICS.042 IC 04487 Removed for calibration. Calibrated. Loop check.

8.) MWP545875 ILICS.048 IC_04490 Removed for calibration. Calibrated. Loop check.

9.) MWP545852 10.) MWR132009 11.) MWR137812 12.) MWR142965

/

i l

Report No. RS-91-137 )

R9 Vision 0 t Page 64 of 73 TABLE 1 RCIC MAINTENANCE OUTAGE 13.) MWR144934 14.) MWR145786 15.) HWR146916 16.) MWR147745 e

(.

_ _ =_ _ _. _ -- - - - -_ _- __

l Report No. -RS-91-137. d Revision 0 Page 65 of 73-TABLE 2 FORCED MAINTENANCE OUTAGE

-3 DATE DOWN TIME COMMENTS 2/2/88 Few minutes RCIC inadvertent isolation during STP-207-4239. Lifted lead problem. CR88-0177.

2/4/88 19 minutes RCIC inadvertent isolation during STP-207-4537. Lifted-lead problem. CR88-0177.

2/7/88 7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months -RCIC isolated when E31*N610A placed in trip condition due >

to failure of E31*N610A reed switch. Sent isolation signel to E51*MOVF064. LCO 88-43.

MWR056017.

2/23/88 25 minutes RCIC inadvertent isolation during STP-207-4538. CR88-0177.

2/26/88 5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months Wrong-type of lubo_ oil added Drain, refill ~. . '.--

-to pump. . MWR056101~.88-071.

3/4/88 few minutes Tripped turbine ~while-performing-STP-207-4249.

Inadequate = procedure.- CR88-0207.

- 5/4/88 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Key' holding the torquefarm to the' valve stem on E51*MOVF078 had fallen'off allowing.

possible stem rotation during-

c.peration. Replaced the key.

LCO 88-128 and-129.

MWR115034. CR88-0370.

t z

T 1

Report No. RS-91-137 d Revision 0 Page H66 of'73 I

]

TABLE 2 FORCED HAINTENANCE OUTAGE ,

j DATE DOWN TIME COMMENTS 6/15/88- 98 hours0.00113 days 0.0272 hours 1.62037e-4 weeks 3.7289e-5 months Fo] lowing planned maintocc 2e.

l Ran RCIC.. Pump did'not meet.

delta P and speed reference

values. CR88-0467.- Clearance.

88-0573. EMWR112350, MWR115615,1MWR116745, MWR117412, MWP518975,_

4 MWR115628, Clearance 88-0592.

- MWR110931,.MWRll5635,

! Clearance 88-0583. Clearance-

88-0592. MWR110931. STP-209-3301. ,

7/9/88 13 hours1.50463e-4 days 0.00361 hours 2.149471e-5 weeks 4.9465e-6 months Replace packing on j' E51*AOVF026. Clearance 88-0654 MWR106376. LCO 88- '

200. STP-209-3301 on AOVF026.

b 9/16/88 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months RCIC isolation-during STP-207-4295.- Lifted lead problem.

CR88-0731.

10/12/88 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months Steam leak on E51*MOVF064

Tightened packing nuts. 'LCO-r 88-381. MWRll7459.-

12/6/88 119 hours0.00138 days 0.0331 hours 1.967593e-4 weeks 4.52795e-5 months Valve leaking steam. RCIC steam. flow transmitters-inop.'

RCIC-isolation. Clearance 88-

> 1222, 88-1233, 88-1240.

Condition Report 88-0905 and

, 88-0912. RCIC turbine, tripped 2

on overspeed. STP-209-3301._

12/21/88' 67 hours7.75463e-4 days 0.0186 hours 1.107804e-4 weeks 2.54935e-5 months Maintenance to insure seismic qualification.- -Clearance 88 =

1300. Work on oil leak on governor. Clearance 88-1305.

MWR129958- and MWR128497.

A_ _- m

~ . . . .. , , .- .- .

Report No. RS-91-137 Revision- 0 Pago 67 of 73 TABLE 2 FORCED MAINTENANCE OUTAGE t

DATE DOWN TIME ' COMMENTS 1/25/89 26 hours3.009259e-4 days 0.00722 hours 4.298942e-5 weeks 9.893e-6 months Repair E51*AOV26. Clearance 89-0117.

2/10/89 11 minutes RClO isolation due to technician error. CR89-0108. >

2/14/89 3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months ~ Level indicator-B21-N695A declared inop. Clearance 89-0242. LCO 89-099, LCO 89-100.

MWR129647.

9/7/89 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months ! RCIC isolation during STP-207-453. -CR89-1008.-

10/8/89 85 hours9.837963e-4 days 0.0236 hours 1.405423e-4 weeks 3.23425e-5 months short in fuse holder duti$g.

STP-207-4530. .LCO 89-475.

CR89-1092'and 1095. Clearance.

89-2505. MWR130447, 130639, 11/13/89 3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months Lost-LNB "A" dc bus'. Got RCIC initiation. .RCIC isolation. . .

No RPV injection occurred.

11/15/89 - 82 hours9.490741e-4 days 0.0228 hours 1.35582e-4 weeks 3.1201e-5 months Leak on E51*AOV54. -LCO'89--

558. Clearance 89-2719.

MWR130638. .MWR1u3690='- air leak,on-E51*AOVF004. H MWR131051 - Replace air hose

, E51*AOVF005.

i

12/11/89 14 minutes RCIC isolation during STP-207-4539.- CR89-1276.

~

1/2/90 9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months - Tagged out to work on exhaust drain trap. Clear high loiel-LCO 90-004. Clearance alarm.

90-0008.

t g - -

i Report No. RS-91-137-Revision 0 Page 68-of 73-TABLE 2- _

i FORCED MAINTENANCE-OUTAGE 4

i

DATE- DOWN TIME- COMMENTS e

1/3/90 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months RCIC-tripped on overspeed

during STP-209-3302. - LCO 90-007. Clearance 90-0017. CR's 90-0005~,-90-0007.

2/11/90 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months Topaa inverters to H13-P618

. and H13-P652 failed. Closed I -Group II valvas on,RCIC per.

Tech Spec. 3.3.2 11/30/90 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months E51*MOVF064 stuck-closed.

, Dispatched operator to open.

12/1/90 3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months Trouble with RCIC alarms in control: room. _ _ LCO 90-660.

12/2/90 120 hours0.00139 days 0.0333 hours 1.984127e-4 weeks 4.566e-5 months Manually tripped RCIC shortly after start due to relief

. valve:11fted.- Triplon

! overspeed. E51*MOVF019 cycling. -CR90-1249, states the-root cause of,overspeed' trips

, was a failed linear position transducer (LPT)-for ERIS

. point E51EA011=.- Also other l problems:LCO 90 664, 666,-671.

Clearance 90-2214.: ;CR90-1210._

s

. .,n

Report.No; URS-91-137 Revision- .CF Page .69 of 73 6

TABLE 3 RCIC STARTS--

DATE RUN TIME START /STOP COMMENTS: j 2/8/88 37 minutes 1543 - 1620 STP-209-3302 2/8/88 11 minutes 2019 - 2030 After trouble-

shooting.

-3/2/88 8 minutes 1522 _1530 JFor pre torque warmup.- ,

4 3

3/2/88- 8 minutes 1555L- 1603' STP-209-3,v2 ,

4/6/88 30 minutes. 1350 - 1420 STP-209-3302 6/14/88 20-minutes 1455 - 1515 'STP-209-3302' 6/17/88 .21 minutes 1029 - 1050 SOP-0035- l 6/19/88 25 minutes 19401- 2005 -SOP'0035' '

,6/20/88'- 7 minutes- '0305 -30312 SOP 30035Eandi STP-209-3 3 0 2-9/.10/88' 140 minutes- 1740 L1820 -STP-209'3302-

.11/2/88; .4 0 -: minutes - 1027? :1107.- STP-209-3302-

>t 12/11/88 ---

-0108- 'TrippedLon overspeed.- ,

4

'-12/11/88--29: minutes :-1426 - 1455 STP-209-3302 E

r' 1 _. ., -. .. . . . ,, -- . . . . _ u, - , , - - .- ,

Report No. RS-91-137 Revision 0 Page 70 of 73 TABLE 3 ,

RCIC-START 3 DATE RUN TIME START /STOP COMMENTS 12/23/88 4 minutes Shutdown RCIC turbine after 4 minutes due to oil leak on RCIC governor.

Clearance 88-1305. MWR128497. Tom Scheibol indicates turbine could have continued to run. Oil leak was small, 12/24/88 28 minutes 0806 - 0834 STP-209-3302 1/27/89 29 minutes 0044 - 0112 After maintenanwe 2/19/89 16 minutes 2241 - 2257 After scram 6/19/89 assume 30 min. 1150 - 1430 STP-209-0601 &

0602 6/20/89 7 minutes 2005 - 2112 STP-209-3302 7/29/89 33 minutes 1323 - 1356 STP-209-3302 9/28/89 -31 minutes 1418 - 1449 STP-209-3302 10/12/89 8 minutes 1159 - 1207 After maintenance 11/13/89 unknown lost dc! bus RCIC isolated, then

. initiated. -No

-injection into vessel.

1/3/90 ---

1130 Tripped on over speed.

A

Report No, RS-91-137 Revision 0 Page- :71-of 73 TABLE'3 -

RCIC STARTS DATE RUN TIME START /STOP COMMENTS 1/5/90 35 m'inutes 1352 - 1427 STP-209-3302. .

4/24/90 20 minutes 0435 - 0455 SOP 035 31 minutes 4/26/90 1328 - 1359 STP-209-3302 7/19/90 -23 minutes 2321= 2344 STP-209-3302.

12/2/90 ---

0959 Tripped on overspeed.

12/7/90 40 minutes -1020 - 1100 -STP-209-3302 3/23/91 76 minutes 0444 -0600 STP-209-3302 3/23/91' -57 minutes 0917 - 1014 =STP-209-3302 3/23/91 -16 minutos 1457 - 1513 -SOP)035-03/24/91 34 minutes 1706-- 1740 STP-209-3302-05/20/91 24. minutes 1516 - 1540. :STP-209-3302 05/20'/91- 61 minutes 1739- 1840 STP-209-3'302 6/21/91 35 minutes '15371- 1612- .STP-209-3302 6/21/91.

90 minutes 2051~- 2221 - STP--20 9- 3 3 0 2 .

Report No. RS-91-137 Revision 0 Page 72 of 73 TABLE 4 SURVEILLANCE FREQUENCY CHANGES STP 'PRESENT __

RECOMMENED STP-207-4205 Monthly Functional Every six months STP-207-4206 Monthly Functional Every six months STP-207-4209 Quarterly calibration Every six' months STP-207-4210 Quarterly calibration Every six months STP-207-4240 Monthly functional Every six months STP-207-4241 Monthly functional Every six months STP-207-4242 Monthly functional Every six months-STP-207-4243 Monthly functional Every six months STP-207-4294 Quarterly calibration Every six months STP-207-4295 Quarterly calibration Every six months STP-207-4501 Monthly functional Every three months STP-207-4502 Monthly functional Every'three months STP-207-4536 Monthly functional Every_six months STP-207-4537 Monthly functional Every six months STP-207-4538. Monthly functional- _Every six-months STP-207-4539 Monthly functional Every six= months STP-207-4548 Monthly functional Every six months STP-207-4549 Monthly functional Every six months :

STP-207-5248 Monthly functonal_ Every six months STP-207-5249 Monthly functional Every six months j STP-207-5250 Monthly functional -Every six' months STP-207-5251 Monthly functional Every_six months. i STP-207-5252- Monthly functional Every.six months STP-207-5253 Monthly functional Every six months STP-207-5254 Monthly functional Every six months <

STP-207-5255 Monthly functional Every six months STP-209-4201 Monthly functional. Every six months STP-209-4202 Honthly functional Every six months STP-209-4204 Monthly functional. .Every six months STP-209-4205 Monthly functional. Every six months STP-209-4206 Monthly functional' Every six months STP-209-4207 Monthly functional Every six months STP-209-4211 Monthly functional Every six months 1 STP-209-5201 Monthly functional Every six months STP-209-5202 Monthly functional Every six months ;

l:

1

~

J

1 Report No, RS-91-137 Revision 0.- l Page 73 of_73 'l TABLE 5 STP ADJUSTMENT ~ HISTORY NUMBER.0F SURVEILLANCES STP REVIEWED RECOMMENED STP-207-4205 32 ZERO STP-207-4206 32 ZERO STP-207-4209 13 ZERO STP-207-4210 14 ZERO STP-207-4240 28 ZERO-STP-207-4241 -30 ZERO STP-207-4142 29 ONE STP-207-4243 30 -TWO STP-207-429i 13 ZERO STP-207-4295 11 ZERO STP-207-4501 32 THREE STP-207-4502 31 FOUR r

STP-207-4536 31- THREE STP-207-4537 29 ZERO STP-207-4538 -30 TWO j STP-207-4539 31 -ONE, l STP-207-4548 30 ZERO l STP-207-4549 -31 -FIVE:

l STP-207-5248 3 0_ _ _ONE-STP-207-5249 30 TWO-STP-207-5250 29E 'TWO STP-207-5251 30 -ZERO:

STP-207-5252 28 THREE STP-207-5253 29. ONE STP-207-5254 28 ZERO STP-207-5255 30- ZERO- 4 TP-209-4201 30 ZERO STP-209-4202- 30 ZERO STP-209-4204- 28 THREE l STP-209-4205 28 TWO STP-209-4206 27 ONE STP-2094207 29 ZERO STP-209-4211- 27 -TWO

-STP-209-5201

~

29 'TWO STP-209-5202. 29 'ONE

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RCIC STANDBY AVAILABILITY .

100 %-

m..ng-a.. .-a-..,. r,.=.aen-a.m. .. r-e --.-e.... ud--.-a=e-==i-~-.c *--Mem. ..=e*+=e+<iA-===*.=*s+w'ea-* ,=wasi.~m.--.mac n= im a w u- i . we---,-..-.. . . .

9gc7, _ . _ . . _ . _ - - . - - _ - - . - . - .- _. _ ._.- -. . - .

94c7, .-. - - -.-- . .-. - - - - . - - .-- - -

f .. - -.- - - -

92% - - - - - - - - - - - - ----- - - - - - - - - -

9gc7, - . _ . . . . . . _ . - - _ . - . . _ - - - - _ . . - . . . - - - _... - - . _---- -

88 % -- -- -:----

+12 MONTH SLIDING AVG --- -

' ' ' ' i ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '

86 %

DJFMAMJ'JASONDJFMAMJJASONDJFMAMJJASONDJFM

'8( 89 90 91 92 i TIIIS CURVE REPRESENTS TIIE PROBABIIIIY OF RCIC NOT BEING IN PIANNID OR FORCED MALNTENANCE OVER 12 MONTII PERIOD.

i

RCIC STANDBY UNAVAILABILITY 12 MONTH SLIDING AVERAGE 10 % n

\

9cjo - - - . _ . . . - . - - - - . - - . . - - . - . - . - . - - . - - - . - . - . . - - . . - _ .

W" -- -d '

8% -- . '- - - - - - - - - -

7% ----- -------

~;f - -- --

g e7 , u - - - p 9 g e g 9 - - - .- - _ -- . -- - _.

5% - - - - -

gpq/ . - - --

H 4% r m

-g 3% ,gg7--- g = _N-- -

28/o b-PLANNED ~~ , M-- ~~~~-

%SM-

- ~ ~

1% I --- - d - - - - - - - -

a gg iiit i it i 1 it i! I I i I t iiI t I -l I 1 I t- r ! 1 1 ! I 1 1 1 I i i IFJ FMAMJ J A SOND J FMAMJ J A SOND J FMAMJ J A SONDJ FM 88 89 90 91 -92 ,

+ PLANNED MAINTENANCE + TOTAL TOTAL INCLUDES PIANNED AND FORCED MAINTENANCE HOURS

REACTOR CORE ISOLATION COOLING CONDITIONAL PROBABILITY ,

95 %

94 % - - - - - - - - - ----- - - - ~ - - - - - - - - - - -

93c7, - - - - - _ . _ - . - . - - _ . - - - . - _ - - - - - - . - . - . _ - - - _ - . .

92cy, _ - - . _ - - - - _. - - . .

i- 91c7, ___._ _ _ _ _ .. _ _ _ _ _ .___ _ _ __ _ _ ___.___ _ _ __

, 94yy, - . - - . - _ . - _ _ - -- _ . -. - . - - _ - - . - - .. - - _

89 % - - - - - - - -

f ggc7, , ..- ._ _- -.. ._ _. - - - _ a g -

87% - d- - - - - - L - - - --- - - - - -

ggcy, _ - - _ - - . _ . _ ._ .- - __ _ :_ - - ._ _ _ . _ _ - _ - ;

. 85 % - - - - - - - - - - - - - - - - - -- - -

1 84 % - - - - - - - - - - ---- - - - - - - - -

83 % - - - - - - - - - - - - - - - - - - - - - - - -

. 82 % -- - - - -

+12 MONTH SLIDING AVE ---

g{c/g _ _ . _ _ _ . . _ . . . _ _ . . _ _ _ . . . . . _ _ . . . _ _ _ . . _ _ . . . _ . . . _ _ _ _ . . _ _ _ . . . _ . . _ _ _ . _ _ . _ . _ _ _ _ . . . - _ . _ . .

gg i! 1 1 I il i l ! ! l ! I I I I il I li f I I I I i i 1 I I f ! I I I I DJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFM 8d 89 90 91 92 CURVE REPRESENTS TIIE PROBABILITY OF RCIC START AND RUN FOR 4 IIOLTS -

WITIIOUT OPERATOR ACTION FOR A RANDOM DEMAND l

, - . A

1 RCIC PROBABILITY OF START 100 % 1

. 98 % -- - - - - - -- -- ' -- -

95cfo - - . . . - . - . - - _ . . - - - . . . - . .

&,,\- - . . . - - - - - - . - - -

94%

xA -

%--- \ w-o+c w:.

92"/o --

h - \ "'--# --

i

\\ /

d 9gcyg - _ . . _ . - . . . - - - - - -

z-g-4..._-. .. - - _ -

i-ggef,

+ PROB OF START

_ _ . ~ ~ ~ - ~ - ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ '

! i ' ' ' '

- 86 % ''''''''ilI i ' ' ''''''' .

!- DJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFM i

88 89 l 90 91 92 i

t' 1- CUMUIATIVE SUCCESSFUL STARTS DIVIDED BY TOTAL STARTS SINCE JAN 1988.

l l

_ _ - _ - _ _ _ _ . - _ _ _ _ - _ _ _ . _ _ .- - ------- . - ---- - -L$

-

RS-91-137, Rev 0 to RCIC Reliability Analysis,River Bend Nuclear Station

Text

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