ML20209F038

Responds to IE Bulletin 85-003, Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings. Description of HPCI & Core Spray & Emergency Feedwater Sys Encl

ML20209F038
Person / Time
Site:	Indian Point
Issue date:	05/13/1986
From:	Josiger W POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-85-003, IEB-85-3, IP3-WAJ-0262, IP3-WAJ-262, NUDOCS 8609120025
Download: ML20209F038 (12)

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Docket No. 50-286

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License No. DPR-64 s/ssR4

'h. 7

.Dr. Thomas E. Murley Regional Administrator U.S. Nuclear Regulatory Comunission

Region I

.631 Park Avenua King of Prussia, PA 19406

SUBJECT:

Indian Point 3 Nuclear Power Plant (IP3) Response to NRC' I Bulletin (IEB) No. 85-03. " Motor-operated Yalve Common Mode Failures Durint Plant Transients Due to Improper Switch Settints"

• Dear Dr. Murley

• Attachments A, B and C to this letter provide the Authority's response to Item. t

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(e) of the subject bulletin.

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Attachment A contains a brief description of the IF3 "high pressure coolant-injection / core spray and emergency fsedwater" systema and the bases for aslection of the motor-operated valves within these systems to be included.

under the scope of the subject bulletin.

i. Attachment B provides the design basis for the operation of each of the valvas

' identified in Attachment A.

• Attachment C provides a description of the activities undertaken by the Authority to develop a program to accomplish Items.(b) through (d) of the subject bulletin. Also included in this attachment is a schedule for com-pletion of these items.

DESIGNATED' ORIGINAL Certified By M

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8609120025 860513 PDR ADOCK 05000286 G

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. Should you or your staff have any spasetions or ee 3regarding the attached..

> c 'informatism, please contact Mr. Michael Cass of my staff.

4 SUBSCR.UED AND SWo:'.t in d

BBCRE F.'E THIS..;./J.__9.V, M-

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I tan Po 3 uclear Power Plant

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d WN Attachments Commte. ion N'g3 cc: Resident inspectors' Office Indian Point 3 U.S. Nuclear Regulatory Comunission P.O. Box 66

.I Duchansa. New York 10511 U.S. Nuclear Regulatory Co d esion Document Control Desk Washington, D. C.

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1. 8 Thit 1sttaetament ytov16mm. a!brief'dederiptima;ef-tho'.IF3."high pressure;4oolante, ;

'+l B 5 Wettssefoote.apray" pystem and theabases fer..selmotimar of eths motorwporated.r Nalves evithia this system to be. included undos.the scopa. of,33 anitatim 85 43..

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-# ~ 2 ' 90eser, eparated Walves,are not 'utilised in thm amargency. auxiliary feedwater system:st IF3. *

'-"sH a Pressure Coolant Iniaction/ Core Spray"-System 4

' IF3 is a four-loop Westinghouse pressurised water reactor plant.which: wililises *,

a safety indoction system (SIS) to provide emergency oore : cooling and rs' activity shutdown margin in the event of a loss-of-coolant accident., steam

.The SIS consiste of an 5enerator tube rupture, or main steen line break.

active, subsystem, a passive subsystem and a recirculation subsyst.sm.

4 The active subsystem consists of a high head and a low. head section. The high head section consists of three high head, centrifugal safety injection

• pumps,.

the boron injection tank (BIT) and use of the refueling water storage tank (RUST). The low head section consists of two centrifugal residual heat Yamoval (RRR) pumps, two RER heat exchangers and use of the INST.

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The passive subsystem consists of four accumulators that are filled with

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borated water and pressurised with nitrogen. A loss of RCS pressure is the

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• only action required to initiate the accumulators.

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The recirculation subsystem is placed into service after the active and passive subsystem have accomplished their fonctions and may take one of two flowpaths consisting of different components. The preferred flowpath consists of:

the recirculation sump, two recirculation pumps and two IIR heat exchangers.' The other flowpath consists of:

the containment sump, two RER yesps sad two RER heat emehangers. The second flowpath is used to back up the preferred flowpath in the event of system malfunction.

The 173 SIS does not utiliza a core spray subsystem in its design.

The high head section of the active subsystem described above is the only This datemination is portion of the IF3 sis within the scope of IEB 85-03

-d e consistent with the boundaries implied ta21ER 85-43 for the "high pressure -

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' < coolant injection / core spray" system and has been confirmed with NRC staff.

• As indicated above, the high head injection subsystem consists of three high

. head SI pumps, Jhe BIT and the use of the RWST. Figure 1 provides a basic outline of this subsystem.

In summary, three high head pumps take suction from the RWST and discharge into the reactor coolant system (RCS) cold legs h two high pressure injection headers. The high head pumps are arranged throu5 so that any two of the three pumps can supply borated water to both injection headers. The SI signal activates the pumps but they are unable to deliver the

-borated water to the cold legs until ECS pressure decreases to less than approximately 1500 pois (the shutoff head of the pumps). This portion of the SIS functions to keep the core covered when RCS pressure remains above the injection pressures of other SIS components and to aid in core flooding on large ruptures.

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A As shown in Figure 1, there are a total of 23 motor-wperated valveh in the t-

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Of these 23 valves, ten have been... a high head injection portion of the 173 SIS.

determined to require evaluation per 1E8-85-43..The other 13 are outside the ecope of the subject bulletin. A brief synopsis of each of these 23 valves. is 6 provided below.

MOY's in Eigh Head Injection eyeten Outside Scope of IRB 85-03 MOV Function 856A Migh Head SI Stop (Cold Leg) 856D High Head SI Stop (Cold Leg) 856F High Head SI Stop (Cold Leg) 856K Righ Bead 81 Stop (Cold. Leg)

Reason for Exclusio_n

' These, valves are not required to be tested for. operational readiness in accordance with 10CFR50.55a(g). These valves have their motor leads discon-nected and are all locked open.

MOV Fonetion 4

• 842 SIS Mini-Flow

• 843 SIS Mini-Flow 850A SIS Pusy 31 Discharge 850C SIS Pump 31 Discharge 851A SIS Pump 32 Discharge e

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8515 SIS Fump 32 Discharge

• 1810 RWSt Discharga

• As indicated below. Yalves 842, 843 and 1810 are de e rgised and maintained in their safe "open" position for the injection phase.

These valves are re-energised and closed for teenafer to cold leg

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recirculation.

Reason for Exclusion These valves are required to be tasted for operational readiness in accordance with 10CFR50.55a(g). However, these valves are de-energized and maintained in I *

.their safe."open" position for the injection phase.

(Discussion with NRC..

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staff has indicated that any de m ergised valves that are not required to S'

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change position for the injection phase may be excluded from the scope of IRB

' 85-03.)

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Function.

sish E nd SI Stop.(Hot Leg) a563 856c -

Eish'Esad SI Stop (Met.. Leg) neues for aselusion 4.Thess' valves are required to be tested for operational readiness in asdordance

'vich 10CFR50.55s(g). However, these valves are de-energised and maintained in

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htheiirsafe " closed" position for the injection phase.. - (Discussicatwith NRC

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'st!aff has indicated that any de-energised valves that are not required to change position for the injection phase may be excluded from the scope of i

IEB 85-03.)

MOV's In Righ Head Injection System Within Scope.of IER 45-03 MDV Function M' 8568 -

513h Bend 81 Stop-(Cold Leg) 56C -

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O4 Eigh Bead II Stop-(Cold Leg)-

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Righ Head 51 Stop (Cold Lag) l 56J %

High Head 51 Stop (Cold Leg) 887A SIS Pump 32 Suetion Isolation 8875:

SIS Pump 32 Section Isolation 1835A BIT Isolation 1835B BIT Isolation 1852A BIT Isolation 1852s BIT Isolation 4

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ATTACBGMT 3 i 5

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This attmehmaat provides the design basis for the. operation of each of the tes. 2 i shoter ;pai ' valves identified in Attachsent 4A to be within the.soape of -..

158 85-03.; 1s indic4ted im Attachment A. these ten valves can-be categorised as follows:

i a) sis Pump 32-Suetion Isolation b) ' BIT. Isolation c) mish Bead SI Stop

.The relevant design information for each of these valves is presented in Table 1 A Sheets A, B and C.

Under the'Opeirating Data section of each sheet, two differential presenre entries are provided. The first is the maximum design differential pressure for opening /cfosing the valve that was specified in the associated Yalve The second is the maximum anticipated Specification' Sheet by the NSSS vendor.

differential,,$ressursforopening/closingthevalveundertheworst-case operating ions.

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. TABLE'1 INDIAN FOINT'3 NUCLEAR 70WER TEANTi w

MOTOR-crEIATED: VALVE DESIM R&TA W.SEEET. C d

, MDY 887A. B iValve functioot SIS. Pump 32 Suetima. Isolation Ysives -

x, Valve $sta

~.s Manufretarer:

Aloyco Typer Gate

. size 6"

Rating:'

150 lbs.

, Actuator Data

'hnufacturers Limitorque

.Sise-Type r SMB-000

. MotoriRFNs 1600

• Overall Unit

. s' Ratio 57 Operatina Data _

' Full Stroke Time to Open/Close (As Specified in Valve Spec.. Sheet) -(Sec.):

120/120

.: Max. Diff. Press. Valve Must Open/Close

. Against -(As Specified in Valve Spec.

Sheet) (psi):

130/150 l

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4. Max. Expected Diff. Press. for Valve to

. 40 pen /Close Against (As Determined for l

IEB 85-03: Item A) (psi):

(approximately) 40/ 25 MOV-887A,-B are energiand and maintained in their "eafe" open position as l

monitored from Control Room Fanal SBF-2.. These valves do not receive an SI.

I signal and.are not required to change position for the injection phase of SI.

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.Following the injection phase, these valves are closed for transfer to cold les rectreulation and remain closed for all. cold las recirculation modes.

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the event'of an inadvertent SI signal, these valves are not affected by SI termination as they are left open to remain in their " ready" state.

e Overe11t att Ratio - Motor _RFM there Unit RPM = _ Stem Speed. The indicated b

Unit RPM Sten Lead a

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valais;(s based on available*information and is currently being verified with. 5 the actuator manufacturer.

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TABLE 1 INDIAN POINT 3 WUCLEAR POWER FIANT 4

MCrr0R 4PERATED VALVE DESIGN DATA I saEET 3.

MOV 1855A, B/1852A, B d

• 1 Valve Functima: '

BIT Outlet isolacion/ BIT 2alet Isolaties. Valves >,,,

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Velve Data

- Manufsaturer:

Darling Type:

Cate

-size 4"

Rating:

1500 lbs.

Actustdr Data -

Manufacturer:

Limitorque i

Size-Type:

SMB-00 s

N Noter RFN:

1800

• • Overall Unit Ratio:

23 Operation Data 19., Full Streka Tisse to Opeln/Closa

' (As Specified la Yalve Spec. Sheet).-(Sec.):

10/10

' ',: Max. Diff.' Frees. Valve Must Open/Close i

t e. Against.(As Apocified in Yalve Spec.

2500/2500

. l Sheet) (psi):

'/ Max. Espected Diff. Press. for Yalve to yOpen/Ciode Against (As Deter =4mme for l

' if.~IER 85-03: Item A) (pet):

(approximately) 1550/ O

't i MOY-1835A, B/1852A, B are energised and maintained in their closed position as

• wonitored from control Room Fanel 957-2.

These -valves receive am SI alsnal

..~.and automatically open for the injection phase of 81..Fo11 swing the injection i

. phase, these valves are lef t open for transfer -to cold les recirculation and

• • =ain eyes,for all cold les recirculation modes.

In the event of an s.

inadvertent SI signal SI termination requires these valves to be samually c.losed to'.nestore them to their normal state.

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• Overall Unic Ratio = Motor RPM where Unit RPM = 8 tem speed. The indicated.

Unit RPM Sten Lead

'G value ip.kased on available information and is currently bein8 verified with

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. the.'actulatorquanaf acturer.

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TA3LE 1 Innun 70tur o macLEAR.POWEEMarf-MDTOR-OPERATED YALVE DESIGE a& tat *iSEEEF:C-7.

'HOVs 856C. E, R, J

'i-Valte Function:

Eigh Mead SI Cold Les Stop Malvear.

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'Yelve Data Manufacturer Velan Clobe

't-Types -

Size:

2" 1500 lbs.

C Rating:

i Actuator Dets i

Manufacturers Limitorque

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Size-Type SMB-00 s

Motor RPM:

1800

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• 0vera11' Unit

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u Ratio:

31.9 oh Coerstina Data i Full Stroke Time to Open/Close

- (As Specified in Valve spec. Sheet) (Sec.): '10/10 Max. Diff. Press. Valve Must Open/Close Against (As Specified in Valve Spec.

2500/2500 Sheet) (pei):

Max. Diff. Prese. Valve Must Open/Close l

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• Againet'(Aa Determined for IRB 85-03:

Item A)'(pei):' (approximately) 1550/17.20

' 'MOV-856C, E, B, J are energized and maintained in their ' safe" open position j

as monitored from Control Room Panel SBF-2.

These valves receive an $1 signal to open but are not required to change position as they are already open.

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Following the injection phase, these valves are left open for transfer to. cold 1eg rec'irculation and remain open for all cold les recirculation modes.

.These

'4 valves would be sequentially closed end re-opened to-identify and isoleta a l

l In the event of an inadvertent SI signal, these,

LOCA outside containment.

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malves are mot affected by SI termination as they are left open to remain in

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their

• ready" state.

l e Overall Unit Ratio = Motor RPM where Unit RPM = Sten speed. The indicated Unit RPM Sten Lead value is based on available information and is currently being verified with O-the actuator manufacturer.

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ATTACWl5NT C

. This attachasst provides a description of the activities sedertaken to date by

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' d the Authority to develop a progran to acosuplish Items.(b) through (d).of the

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subject bulletin. Also. included in-this attmehment le a schedule for:com-plation of these items. These activities can be summarised as follows:

153 35-03 Item (b)_

"Using the results from item (a) above, establish the correct switch settings.' This shall include a program to review and revise, as neces-sary, the methods for selecting and setting all switches (i.e..' torque, 1

torque bypass, position limit. overload) for each valve operation l

(opening and closing)."

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-"If the licensee determines that a valve is inoperable.. the licensee j

shall also make an appropriate justification for continued operation in 1

accordance with the applicable technical specification."

l The Authority is currently in the process of reviewing and establishing the switch settings for the ten motor-operated valves identified in Attachment A sa being under the scope of Its 85-03. The results reported in Attachment 3 for Itan' (a) of the subject bulletin will be used to establish these settings.

Relevant information on the original design of these ten valves has been included as part of these efforts. The Authority has also contracted with the actuator manufacturer to provide and verify certain additional information

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pertaining to the original design of these valves. Upon compilation'of all this information. the methods used to select and set the switches associated with these motor-operated valves will be reviewed and revised as necessary.

It is the Authority's intent to verify proper switch settings for these ten valves such that operation of these valves under worst-case conditions is assured. The correct switch settings for these valves will be finalized prior to cosseneament of the Cycle 5/6 Refueling Outage currently scheduled for early 1987.

• Its85-032 Item (el

'"Ia'dividual valve settings shall be changed, as appropriate, to those established in item (b). above. Whether 4the valve setting is changed or not, the valve will be demonstrated to be operable by testing the valve at the tamwi== differential pressure determined in item (a) above with the exception that testing motor-operated valves under conditions sin-u1 sting a break in the line containing the valve is not required.

Otherwise, justification should be provided for any cases where testing with the maximum differential pressure cannot practicably be performed.

This justification should include the alternative to maxinua differential pressure testing which will be used to verify the correct settings."

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"NorI 1 'This bulletin is not tatended to establish a sequirement for 4

.livalve testsag for the seedittenteinssistdas a breah in the line '

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-oostainths the valve.- Bowevero ao<theisstemt that each valve t

i operation is relied upon in the design

• basis. a. break in the g'~y..

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- line containing the valve should be oomsidered in the analyses.:-( -

the resulting switch.

prescribed in Items (a) sad (b):above, settings for pipe break conditions 5

extent practical, by the same methods that would be used to s

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verify other settings (if any) that are act tested at the -'^"

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maximum differential pressure."

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"Each valve shall be stroke tested. to the estemt practical, to.verif M

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'that the mattings defined in item (b) above have been properly implamsa led even if testing with differential pressure cannot be performed.5

., 6, The switch settings associated with the ten motor-operated valves identif in Attachment A will be changed, if necessary, to conform to the switch *;.

settings established per Item (b) above. The Authority will demonstrate t

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operability of each of these valves to verify that these' settings ETNe properly implemented.

Appropriate justification artil be,provid

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i these valve operability tests are not or cannot be performed er-l expected differential pressures indicated in Attachment

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I Proper s' witch settings will be implemented'and ve'if

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r identified in Attachment A prior to startup from.

Outare currently scheduled for mid-19871 $ - '-=l It should be noted that the Authority 'is'ik the process'o 'evaluat of motor-operated valve testing tools. th'a't(are being used 'to varying. extent 1"throughout the nuclear industry. To this, extent, a pilot ' program.was ) ',

undertaken in 1983 to test a number of' motor-operated valves at 173'us

of the more popular motor-operated valve ' testing systems. ' No specific tool has, to date, been selected for continued use at 1P3. The Authority, however will continue in its evaluation efforts'to determine the merits'that such 4 1

tools may have in aiding the resolution of.this item as it relates to','

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supplemental verification of proper switch settings and valve operation.

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. IEB 85-a03: Item (d) tQ&

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"Prepara or revise procedores to ensure that correct switch settings'E are determined and maintained throughout the life of the plant.. -gi -

Ensure that applicable industry.recosusendations are considered in ~ +

..~%m, preparation of these procedures."

All procedures necessary to ensure that correct switch settings are determined l

and maintained throughout the life of the plant for the ten valves identified in Attachment-A will be in effect prior to commaencement of the activities i - 4,.

described under Item (c) above.

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