ML20096G066

Rev 0 to Sys 80+ Reactor Coolant Pump Seal Loss of Seal Cooling,Test Data Rept

ML20096G066
Person / Time
Site:	05200002
Issue date:	05/14/1992
From:	ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:
Shared Package
ML20096G053	List: LD-92-067, Forwards Rev 0 to Dctr 12, Sys 80+ Reactor Coolant Pump Seal Loss of Seal Cooling,Test Data Rept, to Fulfill Commitment Made at 920422-23 Piping & Mechanical Design Review Meeting ML20096G066
References
DCTR-12, DCTR-12-R, DCTR-12-R00, NUDOCS 9205220144
Download: ML20096G066 (23)

Text

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. l SYSTEM 80+

REACTOR COOLANT-PUMP SEAL o

-LOSSL0F SEAL COOLING TEST-DATA REPORT DCTR 12-REV. 00 o

ll ABB-COMBUSTION ENGINEERING

-NUCLEAR-POWER SYSTEMS WINDSOR,_ CONNECTICUT l!

PbR D K O 2 0002 A PDR

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. LEGAL NOTICE THIS-REPORT WAS PREPARED AS.AN-ACCOUNT'OF WORK SPONSORED-BY

- ABB COMBUSTION ENGINEERING.- FEITHER ABB COMBUSTION ENGINEERING NOR'ANY PERSON ACTING ON-ITS BEHALF:-

i A. MAKES ANY WARRANTY OR' REPRESENTATION, EXPRESS OR

- IMPLIED INCLUDING THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, WITli RESPECT TO T!!E ACCURACY,- i COMPLETENESS, - OR ,USEFULNESS OF Tile INFORMATION CONTAINED IN THIS

' REPORT, ' OR TilAT- Tile' USE OF ANY - INFORMATION, APPARATUS, METilOD, OR PROCESS DISCIDSED IN TIIIS REPORT MAY NOT INFRINGE PRIVATELY OWNED RIGHTS; OR B. ASSUMES ANY LIABILITIES WITH RESPECT TO THE USE OR FOR DAMAGES RESULTING - FROM THE USE OF, . ANY' INFORMATION, APPARATUS, METi!OD OR PROCESS DISCIDSED IN TIIIS REPORT.

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.l LEGAL NOTICE ,

THIS . REPORT WAS PREPARED AS AN ACCOUNT OF WORK SPONSORED BY ABB COMBUSTION ENGINEERING. NEITHER ABB COMBUSTION ENGINEERING i NOR ANY PERSON ACTING ON ITS BEHALF:

A.. MAKES ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED. INCLUDING THE WARRANTIES- OF FITNESS FOR A PARTICUIAR PURPOSE OR MERCHANTABILITY, WITH RESPECT TO THE ACCURACY, COMPLETENESS, OR.USEFULNESS'OF THE INFORNATION CONTAINED I.N THIS REPORT, OR THAT THE USE OF ANY INFORMATION, APPARATUS, - EIHOD, OR PROCESS DISCLOSED IN THIS REPORT MAY NOT INFRINGE PRIVATELY OWNED: RIGHTS; OR B.

-ASSUMES ANY LIABILITIES WITH RESPECT TO THE USE OR FOR DAMAGES RESULTING FROM THE USE OF, ANY INFORMATION,-APPARATUS, METHOD OR PROCESS DISCIDSED IN THIS REPORT.

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TABLE OF CONTENTS l Title- Pane No.

l'0. Purpose.- 4

'2.0 Introduction 4

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3.0.. Test.Prograra 5 3.,1" ; Description- i 3.2 Resulta 3.3 Conclusion b 4.0 References. 12 ,

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LIST OF TABLES AND FIGURES Table No. Title Pace No.

-l' Test Loop Instrument _ List - RCP Seals 13 ,

Finure No.

1 Flow Diagram For Hydrodynamic Shaft Seal 14 System 2 Loss of Cooling Water to Seals - Pump 15 Stopped

' i' 3 Loss of Seal- Injection - Pump Stopped 16 o 4' Loss of Seal Injection and Cooling Water 17 to Seals --Pump Stopped 5 Loss of Cooling Water to Seals - Pump. 18 Running-6 . Loss of. Seal-Injection - Pump Running 19 L

l; Page 3 of 19 J

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1.0- - Purchse )

.i The-purpose of this report'is to provide test data to document the

-capabilities of _ the System 80+ reactor coolant purep (RCP) seals to.

operate with_ loss o{ component cooling _ water or loss of seal injection water for various off_ normal plant operating conditions.

/ 2.0_ Introduction.

In response to NRC Ceneric Safety Issue (CSI)-23, CESSAR-DC Amendment F states that RCP seal integrity-is maintained for off normal plant operating conditions by assuring availability of seal cooling systemsc The System 80+ RCP seals are normally cooled by

~

component cooling water and seal injection water but are capable of operating with component cooling water only or seal injection wator only.

The NRC's primary concern appears to b, the capability of the RCP seals to withstand Station Blackout-(SBO) conditions which involves potential loss of component cooling water and seal injection water in conjunction with' ioss of electrical- power to the RCPs. In order to assure-seal cooling during SB0 conditions, the System 80+ seal

-injection supply _ system is designed to maintain seal injection water for.a SBO. Seal injection water is provided-by dual ~ division Safety Class 3 centrifugal charging pumps which are part of-the Chemical Volume Control System. The charging pumps are normally powered Zrom non-safety grade electrical buses but are powered from an. alternate AC (AAC) power supply _ for SBO conditions. The AAC power is also used to

_-pover the component cooling water system pumps during SB0 conditions to ensure that component cooling water is furnished to the charging.

pumps. The AAC power source is described in CESSAR-DC, Chapter 8,

. Section 8.3.1.1.5, Non Class 1E Alternate.AC Source Standby Power

' Supply.

The NRC staff is also concerned about loss of seal cooling for other l off normal plant operating conditions. These conditions are addressed in ABB-CE response to NRC RAI 440.119. In order to verify the

- Page 4 of 19

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capability of the RCp seals to withstand these condit$ons, the NRC staff has requested test results from RCP test programs on production pump assemblies.

The System 80+ RCP design is the same as that used by the System 80 plants as represented by_the RCPs at the Palo Verde Nuclear Generating A

7 Station. The palo Verde RCPs were extensively shop tested including one 500 hour0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> test plus 50 hour5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> tests for the other pump assemblies.

During these tests the response of the RCPs to various off-normal cooling events was documented. Specifically, the following tests were performed.(Component Cooling Water is shortened to " cooling water"):

Caso Descrintion

1. Loss of cooling water to the pump seals, seal injection water available, pump stopped-(equivalent to SB0 conditions with AAC power supply).

2. Loss of seal injection water, cooling water available, pump stopped.

3. Loss of both seal injection water and cooling water to the pump seals,l pump stopped (equivalent to SB0 conditions prior to the start of AAC power Supply).

P

4. Loss of cooling water- to the pump seals, seal injectien water available, pump running.

5. Loss of seal injection water, cooling water available, pump running.

3.0 Test Pronram - Loss of Cooline Water and Seal Iniection Water to the RCP Seals Page 5 of 19

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13.1 -Descrintion The tests were performed on production pump assemblies in the ABB-CE ,

test loop in Newington, N.H. The test loop is a closed loop, designed to operate at plant normal operating pressure and temperature. The pump- can be tested at the full range of expected plant flow rates by varying loop system resistance by means of control valves in the test loop.

'" -The arrangement of the shaft seal system is schematically shown in

-Figure 1. The reactor _ coolant pump has redundant seal cooling systems; the first uses cooling water to cool the high pressure cooler and _the seal (throttle) coolers and the second is seal injection water which is introduced upstream of-the high pressure cooler. Seal water temperatures-are measured before and after the high pressure cooler

-and in each of the seal assemblies. Contro11*J 1eakage flow is also measured. Table 1 lists the above cited instrumentation elong with other. instrumentation used fot the test.

'3.1.1 Loss ' of Cooling-Water to the Seals Pump Stopped (Case 1)

With the system: operating at normal conditions, the pump was shut

-down. Normal _ operating conditions are 2220 psia and 565'F. Cooling water to the seal cooling system (high pressure cooler and seal cooler) was: reduced and isolated. When the-seal temperatures had

-stabilized. the cooling water flow was resumed after two hours and twenty-nine minutes. Seal injection flow was maintained throughout the test.

3.1.2 ioss 'of Scal Injection Water - Pump Stopped (Case 2)

With the system operating at normal conditions, the pump was shut down. Seal injection was reduced and isolated. When the seal temperatures had stabilized, seal injection was resumed af ter ono hour and twenty. minutes. Cooling water to the seal cooling system

.(high' pressure cooler and seal cooler) was maintained throughout the test.

Page 6 of 19

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.i . . l 3.1.3 ' Simultaneous Loss of Seal Injection Water and Cooling Water to the j

-Seals

• Pusup Stopped (Case 3)-

With the system operating at normal conditions, the pump was shut down. Both the seal injection flow and cooling water flow to the seal cooling system was reduced and isolateu. After-36 minutos cooling water was restored and seal temperatures stabilized. -Ten (10) minutes later or 46 minutes into the' test seal injection was restored and seal temperatures returned to their initial values.

3,1;4 Loss of Cooling Water : Pump Running (Case 4)

With the. pump operating at normal conditions, cooling water to the seal cooling system was reduced and isolated. After seal temperatures had stabilized, conditions were held stable for two hours, then

. cooling water was resumed at five hours and eighteen minutes into the test. Seal injection flow was maintained throughout the test. ,

3.1. 5 ' Loss-of Seal Injection Water - Pump Running (Case 5)

Vith the pump operating at normal conditions, the seal ' injection flow -'

was reduced and isolated. After the seal temperatures had stabilized, conditions were held stable for-one hour, then sca1' injection was resumed at two hours and twenty-one minutes in o the test. Cooling e

water to the seal cooling system was. waintained throughout the . test.

3;2- Results-The-L The results of the tests are shown in Figures 2 through Figure 6.

behavior of-the cooling' water temperature (T400), seal injection temperature (T225) and-seal temperatures (T003, T004 and T005) are l -plotted. .The controlled leakage flow (F275) is either plotted or reported-in the text. Seal temperatures and controlled leakage flow l are the critical parameters which determine seal performance during the loss of seal cooling tests. Cooling water flow (F404) or seal injection flow (F225) are either plotted or reported in the text.

Results of the individual tests are reported as follows:

Page 7 of 19

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13=2.1 Losstof. Cooling Water to the Seals - Pump Stopped (Case 1)

The pump.was shut down at_88:00:00 hours into the.500 hour0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> test.

-Approximately one half minute'after shaft rotation ceased (88iO4:45

-hours),_ cooling water wad reduced and isolated. It takes approximately four minutes for the pump to coastdown to a stop. At 90:23:30 hours..the seal temperatures had stabilized and cooling water was restored at 90:29:00 hours, Cooling water temperature was initia11y'ar 42*C. (108'F) and seal injection temperature was 65*C (149'F).

The results of the test are shown in Figure 2 which is a plot of seal temperatures versus time. Seal temperature T005 is the most critical because it normally runs the hottest-and it'is the temperature in the last or.. top seal. T005 was initially at 52*C (126*F) and stabilized at 67'C (153*F) before cooling water was restored after 02:29:00 hourn. The other seal _ temperatures (T003 and T004) stabilized at 64'C (147'F) sad 60*C (140'F) respectively. The normal operating seal temperecure limit is 70*C (158'F) with a pump shut down value of 80*C (176*r), _

~It should be noted that this test _ was run with seal injection water ,

temperature at its maximum acceptable; design value of 150*F inscead of the normal operating range of_100*F to 120'F. If the test had been run with seal injection water in its normal temperature range the seal

- temperatures would have stabilized at several degrees above = the corresponding seal injection inlet temperature and considerably ~ below the measured seal temperatures'in this test.

The test clearly shows that. the pump _ seals are capable- of withstanding a loss of cooling water with the pump idle and seal injection water available. This condition corresponds to what would occur in the

. System .80+ design during SB0 conditions with seal injection water furnished by the charging pumps powered by the alternate AC power source.

Page 8 of 19

3.2.2 Loss of Seal Injection Water - Pump Stopped (Case 2) ,

The pump was shut down at 108:53:00 hours. One minute after shaft rotation ceased (108:58:00 hours) seal injection was reduced and isolated. At 110:12:00 hours, the seal temperatures had stabilized and seal injection was resumed at 11C:18:00 hours. Seal injection water was off for a total of 01:20:00 hours. Seal injection temperature was initially at 65*C (149'F) and cooling water temperature was 42*C (108'F).

The results of the test are shown in Figure 3 which is a plot of seal temperature versus time. The temperature (T005) in the top seal stabilized at 55'c (131*F) which is well below the operating limit of 70*C (158'F).

The test shows the capability of the seals to withstand a loss of seal injection with cooting water available and the pump shut down.

3.2.3 Simultaneous Loss of Seal Injection and Cooling Water to the Seals - ,

Pump Stopped (Case 3) f The pump was shut down at 85:10:00 hours. When shaft rotation ceased (85:14:00 hours), the seal injection flow and cooling water flow to -

the seal cooling system was reduced and isolated. Cooling water was restored at 85:50:00 hours and seal injection flow was restored at 86:00:00 hours. The seal cooling system was without cooling water for 36 minutes and seal injection flow was isolated for 46 minutes. beal injection temperature was initially at 65'C (149'F) and cooling water was 41*C (106*F).

The results of the test are shown in Figure 4. The top or last seal temperature (T005), which was initially at 51*C (124*F), reached 57'c (135*F) at 36 minutes into the test when cooling water was restored.

T005 than stabilized and seal injection was restored at 46 minutes into the test, after which seal temperatures returned to their initial values.

Page 9 of 19

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The1 purpose of this test was to show that the plant operator has at lease 00 minutes to restore'either cooling water or seal injection water with the-pump shut down in a hot reactor coolant system, t

The conditions of the test were similar to what would-happen at-the start of a station blackout (SBO) event prior to the start of the ACC. No attempt.was made to extend the length of the test beyond

.36- 46 _ minutes . The loss of both cooling systems for longer than 30 minutes is beyond the System 80+ RCP seal cooling design basis.

Por theEabove three tests the controlled-leakage line was closed. The leakage through the'last or top seal was measured and there was no -

change' in leakage rate.

3.2.4 Loss of Cooling Water to the Seals - Pump Running (Case 4)

Cooling water to the high pressure cooler and seal cooler was shut.off at 40:10:00 hours. After five hours and eighteen minutes cooling water was restore (* Cooling water temperature was-initially at 29'C (85'F) and seal injection temperature was 30*C (86*F).

.The results of the test are shown in Figure 5 which is a plot of the seal temperatures versus time'.

When cooling water was isolated, the topLsea1' temperature-(T005) was-initially at 40*C (104*F). After t l -approximately one hour and twenty minutes T005 stabilized at 60'C (140

• F) . At that time se injection water temperature was raised from 30*C (86*F) to 39.3 s103*F) and maintained until seal temperatures stabilized After seal temperatures stabilized and approximately two hours and twenty minutes further into the test. T005 stabilized at 70*C (158'F):which is the seal normal operating limit.

Af ter five hours and eighteen minutes component cooling was re-established.

Controlled-leakage was measured throughout the test and remained essentially constant between 0.685 and 0.705 m /hr (3.02 and 3.10

( gpm). Tha nominal design value for controlled leakage flow is 3.0 gpm I -with a maximum allowable value of 5.0 gpm.

Page 10 of 19

The results of the test dernorstrate that wita loss of cooling water to the pump seal assembly, the purnp will continue to function without exceeding design seal Icakar,e lignits and without exceeding seal temperature limits. Based on the slow rate of temperature rise shown in Figure 4 the plant operator will have far in excess of 30 ininutes to initiate suitable action after a loss of cooling water.

The pump oil lubricated bearing assembly is furnished with oil cooler 1

cooling water from the same source as the seal high pressure cooler and seal coolers. The operating limit for the bearings witbout k cooling water is 10 minutes to avoid any bearing damage and 30 minutes without damage which could adversely af fect puttp constdown flow.

Tim ro f o re , the bearings are more limiting than the ceals for the condition of loss of cooling water with the pump running.

~

The results of this particular test were previously reported to the NRC in References (1) and (i) as part of the licensing effort for the -

System 80 plar.t. m

3. 2. 5 Loss of Seal Injection Vater - Pump Running (Case 5) e The seal injection flow was reduced and isolated at 22:12:15 hours.

At 23 10:00 iiou's, the seal temperatures had stabilized and conditions were held stable for one hour. At 24 33:15 hours, seal injection was resumed and adjusted to 1.5 m / hour. Seal injection ve.s off for a total of 2:21:00 hours. Seal injection temperature was initially at 60*C (140*F) and cooling water temperature was approximately 38'C (100*F).

The results of the test are shown in Figure 6. The seal temperatt s

(*l003, T004 and TOOS) stabilized at between 59'C (138'F) and 61*C (142*F), well below the 70*C (158'F) operating limit. Controlled leakage flow (F275) was measured throughout t.h" test and remained e sentia11y constant at approximately 0.78 m /hr (3.4 gpm).

The test shows the capabaity of the seals to vD hstand a lor s of seal injection water with th3 pump running and cooling water available.

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t 9

3.3 fanc'up.1pm System 80+ RCP seal integrity is inaintained f or the of f normal seal cooling operating events. This is accomplished by providing independent and redundant seal cooling via the cortponent cooling water syatem and the dual division seal injection system. This capability has been deinonstrated by a series of test performed on production pump assemblies in the ABB CE test loop located in Newington N.ll. The tests covered five dif ferent loss of cooling conditions and

• demonstrate the diverse capabilities of the RCP seals.

4.0 Referencea

1. CE Topical Report, Performance cf CE System 80 Reactor Coolant Pump with Loss of Component Cooling Water, CENPD-201 A, dated March 1976.

2. CENPD 201-A, Supplement 1, System 80 Reactor Coolant Pump Loss of Component Cooling Water Test Report.

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l Table 1 TEST LOOP __ INSTRUMENT LISJ RCP 3EA1.S INSTRUMENT TAG N1%[d3 DEVICE [LESCRI PTION (L1Tji T001 RID llP Cooler Inlet Temperature C T002 RTD lif Cooler Outlet Temperaturo C T003 RTD Seal No. 1 Outlet Temperature C

• 1004 RTD Seal No. 2 Outlet remperature C T005 RTD Seal llo. 3 Outlet Temperature C T225 RTD Seal Injection Water Inlet Temperature C T400 RTD Component Cooling Vater Outlet C Temperature T104A RTD Test Loop Temperature C F275 Rotaaeter Controlled Leakage Flow Cubic Meters per hour F225 Rotameter Seal Injection Water Flow Cubic Meters per hour F404 Rotameter Component Cooling Vater Flow Cubic Meters per hour d

Page 13 of 19

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aSEAL LEAKAGE TO RDT' '

$01 - SEAL CAVITY PRESSURE CONTROLLED P02 = INTERMEDIATE PRESSURE g ty, AGE (CBO)

P03 = BACKUP PRESSURE TO vCf

... FLOW 77 RESTRICTOR HlGIO COUPLING HIGH PRESSURE COOLE.t I -

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~J THlR0 SEAL

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(DACKUP SE AL) THROTTLE o

_ COOLER w

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l To4 SECOND SEAL P02 THROTTLE

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FIRST SEAL

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T02 CYCLONE AUXILIARY '"T  ; !i RLTER IMPELLER ,,,,1 1, 1 1, JOURNAL I

BEARING JET PUMP

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-1 SEAL IMPELLER INJECTION Figure 1 Flow Diagram for flydrodynamic 5 haft Seal System, i

Page 14 of 19

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FIGURE 6 page 19 of 19 I 1

l l

, U.S. Nuclear Regulatory Connission LD-92-067 May 14, 1992 4-p._,._

t ATTACHMENT 2

1. ..~

SYSTEM 80+ DESIGN' SPECIFICABON PREPARATION LOGIC

--c

. SYSTEM 804- DESGN TEAM A --* - c SYSTEM 80t DESGN TEAM B >

DESGN CERTIRCAT10N ITAACS-A FOR I SYSTEMS - l l

ARRANGEwENT ITAACS {

STMDARD -

DESGN MA*C3 SYSTEMS  !

PRACTICES - '

e- NSSS [ ARRANGEMENT  !

. NRC

. IDESM [ DRAWNGS l

-l {

REQUIREMENTS '

6 NSSS 'l DESGN l

., -s PREPARE  ! DETAR. PREPARE PREUM'NAR.

Y \ FINAL SYSTEM }. .

=[\

DESGN l ENGINEERING DESIGN DESGN- / / DC (CESSAR

• h FOAKE SPECS

1RMSrtR ,

CESSAR *I 0F A/E EOU;PMENT B +  !

DC

• BOP .

. l (IF rgf3 APPROPRIATE) UST r DESGN l t

, NSSS & l BOP'  !

• DOP ,

, PREUMINARY - DRAWINGS DWGS

] DRAWNGS I 'SETEM

• INTERFACE SYSTD;

• DESGN-  !

RE N 4TS l

-* DESGN REQUIREMENTS

[

REQUIREMENTS COMPONENT i

• DESGN REQUIREMENTS I

f

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