ML20079B654

Nuclear Safety-Related,Containment Cooling Svc Water Pump Room Cooler Heat Load Study, for Plants

ML20079B654
Person / Time
Site:	Dresden
Issue date:	07/12/1988
From:	Cevigney S, Kane T SARGENT & LUNDY, INC.
To:
Shared Package
ML20078A188	List: ML20079B654
References
FOIA-94-73 SL-7120, SL-7120-R01, SL-7120-R1, NUDOCS 9501060261
Download: ML20079B654 (26)

Text

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NUCLEAR SAFETY-RELATED i CONTAINMENT COOLING SERVICE WATER i PUMP ROOM COOLER HEAT LOA 0 STUDY  !

DRESDEN STATION - UNITS 2 AND 3 i Report Prepared for i

Comonwealth Edison Company l I

Report SL-7120  :

Revision 1 July 12,1988 ,

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950106026- 940315 PDR FOIA WILLIAMS 94-73 PDR Zhjd [e ,

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• Page i TA8LE OF CONTENTS i

PAGE

!.- Introduction .

1 II. Transient Analysis- 1 III. CCSW Fan Failure 4

!Y. Summary - Conclusions and Recommendations 5 Y. Reference Documents 9 VI. ATTACHMENTS A. Figure 1 - CCSF Pump Room Temperature 9 950F Inlet Water Temperature - One CCSW Pump Operating

8. Figure 2 - CCSW Pump Room Temperature 9 850F Inlet Water Temperature - One CCSW Pump Operating  ;

I C. Figure 3 - CCSW Pump Room Temperature 9 750F Inlet Water Temperature - One CCSW Pump Operating D. Figure 4 - CCSW Pump Room Temperature 9 95 0 F Inlet Water Temperature - Two CCSW Pumps Operating i E. Figure 5 - CCSW Pump Room Temperature 9 85 0 F Inlet Water Temperature - Two CCSW Pumps Operating F. Figure 6 - CCSW Pump Room Temperature 9 75 0 F Inlet Water Temperature - Two CC5W Pumps Operating O

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'- *I SL-7120. R;v. 1  :

Page'ti  !

G. IE Bulletin 78-05 " Malfunctioning of Circuit Breaker Auxiliary ' .

Contact Mechanism - General Electric Model i CR105X," dated April 14, 1978. , li

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, , I. ' INTRODUCTION  :

The containment cooling service water (CCSW) pump room for each unit is located in the Tcrbine Sufiding at elevation 495'-0" (Reference A). I Each pump room contains two CCSW pumps and four coolers. Each pump has  ;

two coolers associated with it. Each cooler includes a coil and two fans. Depending on the mode of operation, one or two CCSW pumps operate-f in the room. Therefore, when one pump operates, four cooler fans are 1 i normally operating in the room. When two pumps operate, eight cooler j fans are normally operating in the room. The pumps and coolers are part l

of the low pressure coolant injection system. (

Per Reference 8, the Dresden plant has been experiencing frequent trips l

of the the CCSW pump room cooler fan breakers causing 1 or 2 fans to be inoperable. The CCSW pumps and. cooler fans can continue to operate  !

until the room temperature reaches 1310 F without exceeding their qualification temperatures (Reference Q). The purpose of this study is - . l twofold-t A. First, determine how long one CCSW pump operation can continue  !

without exceeding a CCSW pump room temperature of 131 0 F, with varying numbers of fans operating and entering service water temperatures of 950F, 85 0F and 75 0F. Also, determine how long two #

CCSW pump operation can continue without exceeding a CCSW pump room i 0

temperature of 131 F with varying numbers of fans operating and  ;

entering service water temperatures of 950F, 85 0F and 750F. l

8. Secondly, determine the reason for the frequent fan cooler trips  !

and provide recommendations for eliminating this problem.

II. TRANSIENT ANALYSIS The transientianalystr. fnr the estimation of the room air temperature involved the preparation of a cubicle model which represents the geometry and heat transfer characteristics of the pump room and a fan cooler model which describes its heat removal capability for various es em o

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• 1 SL?7120. Rev.

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, , combinations of cce or two CCSW pumps eperating, falet-service water i temperature and number of fans operating. Details of the analysis are .

found in Reference P. The salient assumptions and information used in-this analysis are stated below. '

i A. Cubicle Modeling Assumptions and Information

1. Thermophysical heat sink properties from Reference C were used l to model the concrete and steel boundaries of the CCSW cubicle.

2. The free volume of the CCSW cubicle was taken to be 855 of its gross volume to account. for equipment, piping, ductwork, etc.,  !

within the cubicle.  !

3. A LOCA temperature of 120 0 F (Reference D) exists in all-surrounding cubicles.

4. A loss-of-offsite power was assumed to occur, so that no j normal ventilation to the CCSW cubicle or its surrounding l cubicles was considered in the analysis.

5. Because of the close proximity of the buried circulating water.

header, the soil on the north side of the cubicle was assumed i to be the same temperature as the condenser discharge I

circulating water temperature (115.3 F 0maximum per Reference  :

0).

6. The duct / concrete / steel plate combination in the cubicle floor was modeled conservatively as a 15 2ft steel plate. ,

7. The heat load of each pump motor is 100,915 8tu/hr (Reference E), the lighting heat load is 1638 Btu /hr (Reference F) and i the heat load due to each cooler fan was conservatively assumed to be 7632 Stu/hr (Reference G). l

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. . St.-7120. Rev. 1 Page 3 i l- 8. Radiatica and conv:ction heat tra2sfer from the 1200 F air surrounding the CCSW cubicle to the cubicle was accounted .

for. A conduction path through the soil / concrete was modeled on the north side of the cubicle.

9. An initial CCSW cubicle temperature of 105 F0was assumed

, (Reference H).

10. The hinged test plates, used when pressure testing water tight doors on CCSW cubicles, are assumed to be open or removed. ,

8. Fan Cooler Modeling Assumptions and Information l

1. The heat removal rate for the fan coolers is assuned to depend on the number of fans operating in the room, the inlet cooling  ;

water temperature and the room air temperature. .

2. The heat exchanger coil associated with each fan is assumed to be half of the coil of a 2-fan unit and the heat transfer in i each half does not depend on whether or not the other fan is operating. Also, see 3, below.

3. The mean cooling water temperature in each fan's associated oil is assumed the same as with both fans of a 2-fan unit operating even if one fan is off. This is conservative since without one fan operating, the mean cooling water temperature would be less and provide a lower temperature heat sink.

4 The reduction in air flow rate through a fan-coil path due to t increase in the air temperature is assumed to be negligible.

5. The overall heat transfer coefficient for the coil is assumed to be independent of room air temperature.

6. The effectiveness of each- fan-coil unit was assumed to be con-stant and based on the design point data of Reference !. -

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" -SL-7120. Rev. 1

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7. Based on the above, the methodology of Reference J was used to ' .  ;

determine the heat exchanger ef fectiveness and the heat re-moval rate at each inlet water and number of operating fans combination.

8. For the case of two CCSW pump operation, the number of operating fans are assumed divided as evenly as possible between each CCSW pump's fan cooler units. This is to ensure adequate mixing of the CCSW pump room air.

III. CCSW FAN FAILURE A. Brief History of CCSW Fan Failures 1

On October 1,1987, at 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br />, with Unit Z at 935 rated thermal ~ ~

power while conducting 005-1500-2, Monthly Containment Cooling  !

Service Water Pump Test for the In-Service Test (IST) Program, the equipment operator discovered that one of the four (specifically l fan 2-5700-300) CCSW watertight vault room cooler fans (which cools the 2C CCSW pump) was not operating. The Unit 2 Shift Foreman immediately investigated this anomaly snd discovered that the 480 Vac contactor was open. Electrical Maintenance (D4) personnel were innediately dispatched to Motor Control Center (MCC) 29-2 compartment D3 to investigate and repair this failure under the direction of Work Request #69311. The contactor coil was burned out and was replaced. The watertight vault cooler fan (2-5700-300) was then declared operable along with its associated CCSW pump.

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on. October 4,1987, at 2140 hours0.0248 days <br />0.594 hours <br />0.00354 weeks <br />8.1427e-4 months <br /> with Unit 2 at 994 rated thIrmal-  !

power while conducting 005-1500-3, CCSW Pump Test. which results in' ,

the 2B LPCI pump being out of service, the CCSW watertight ~ vault cooler fan (2-5700-300) which cools the 2C CCSW was again found inoperable due to the 480 Yac contactor being open. - Investigation -

and repairs by EM personnel were then initiated. The watertight .

vault cooler fan (2-5700-300) was declared operable at 0625 hours0.00723 days <br />0.174 hours <br />0.00103 weeks <br />2.378125e-4 months <br /> t on October 5,1987.  !

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B. Analysis of Failure -

Deviation Investigation Report (DIR) titled " Orderly Unit Shutdown Due to Inoperable 28 LPCI and 2C CCSW Pumps", DIR number 12-02 i 136-00, was written to address this problem. The DIR stated the '

root cause of the 480 Yac contactor failure has been attr(buted to binding auxiliary contacts on the 480 Yac contactor. These auxiliary contacts would bind in the partially opern/ closed position ~ *  :

causing high resistance and arcing when the 480 Vac contactor attempted to seal in. The binding of the auxiliary conta' cts I resulted in high temperatures,of the contactor coil windings and eventual coil burnout. The binding auxiliary contacts are believed to be the cause for both (October 1 and October 4) CCSW watertight vault cooler fan (2-5700-300) failures.

IV. SUMARY-CONCLUSIONS AND REC 0 MEN 0ATIONS A. One CCSW Pump Operating i

Figures 1, 2 and 3 are plots of the transient CCSW cubicle temperature for 950 F, 850F and 750F entering cooling water temperature, respectively. Figure 1 presents five curves describing the transient temperature as a function of time with 0, 1, 2, 3 or 4 fans operating. From this figure it is seen that the CCSF cubicle will reach a temper.ature of 1310F in less than 2  ;

minutes when no fans operate. Although not shown in this figure the CCSW cubicle temperature would exceed 160 0 F in 6 minutes with no fans operating. When 1 fan operates, the temperature at 10' l

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-St.-1120 Rev. 1 i

".. page 6. i hours as shown in the figure is approximatoly 1284. At 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> j the additional . temperature increase in the cubicle is less than 2 ~ *

. degrees above the 10-hour value. Efforts to qualify the CCSW pump )

8F motors to temperatures greater than 131 would have marginal  ;

success because our results indicate that only a marginal increase in the operating time could be justified. The cubicle remains below 1154 for a' 10-hour period for the conditions of 2, 3 or 4 operating fans. Also, the temperature rate of increase, at 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />, is minims 1. .

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The 85 F inlet cooling water results are presented in Figure 2 and they indicate that the cubicle temperature will reach 120*F in l

approximately 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> with 1 fan operating. The heat remenval rate r in the 2 fan case balances the heat load in the room and the 3 fan j case causes the cubicle temperature to decrease.

. Figure 3 presents the case of one fan operating with 75'F' inlet '-+

water temperature. In this case, the CCSW temperature is approxi-

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mately 1120 F after 10* hours and is increasing slowly. l t

Results for the 4 fans operating case at an entering cooling water I temperature of 850 F and the. 2, 3 or 4 fans operating cases at 754  !

entering water temperatures were not calculated because the results i are bounded by the cases presented. ,

8. Two CCSW Pumps Operating Figures 4, 5 and 6 present CCSW cubicle temperature transients for j 950 F, 85% and 754- entering cooling water temperature with two i CCSW pumps operating. Figure 4 presents five curves describing  !

transient temperature as a function of time with 1, 2 '3, 4 or 6 l fans operating. From this figure it is seen that the CCSW cubicle will reach a temperature of 1314 in less than 2 minutes when only j 1 fan operates. When 2 fans operate, the temperature at 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> I as shown in the figure is approximately 1290F, Ai; 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> the additional temperature increase in the cubicle is less than 1 '

degree above the 10-hour value. For the condition of 3, 4 or 6 l

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' SL-7120, Rev. 1 Page 7 i fans cperating, th] cubicle remains below 1204 for a 10-hour period and the temperature rate of increase after 10-hours is ,

minimal.

The 850 F . inlet water results are presented in Figure 5 and they indicate with only one fan operating the cubicle temperature will -

0 also exceed 131 F in less than 2 minutes. With 2 fans operating {

the cubicle temperature will reach 120% in approximately 10 l hours. With 3 fans operating, the cubicle temperature remains I below 1104. The her$ removal rate slightly exceeds the heat load with 4 fans operating.

i Figure 6 indicates that even with 75 F0 entering water temperature I and 1 fan operating the qualification temperature for the CCSW pump motors is exceeded in less than 3 minutes. With 2 fans operating the temperature in the cubic 1'e is less than 1114 after 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. ,

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Results for the cases of more than 6 fans operating at an entering  ;

cooling water temperature of 954, the cases of more than 4 fans operating at an entering cooling water temperature of 850 F, or the cases of more than 2 fans operating at an entering cooling water temperature of 754 were not calculated because the results are bounded by the cases presented.

To ensure adequate mixing, the above results assume the number of fans operating are evenly divided between each CCSW pump's fan l coolers. When three fans operate, however, one fan would be associated with one CCSW pump's cooler and two fans would be associated with the other CCSW pump's coolers.  !

C. CCSW Fan Failure Sargent & Lundy (S&L) agrees with DIR 12-02-87-136-00 and concurs that the 480 Yac contactor coil failed as a result of the binding auxiliary contacts mounted on the.the 480 Yac contactor. .

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• SL-7120. Rev. 1 Page 8 SSL frvestigated Nuclear Plant Reliability Data Systea (NPRDS) and  ;

determined there wa s no sinflar occurrences noted in the data systes.

In addition, SAL investigated to determine if the failed auxiliary contact (General Electric (G.E.) Model No. CR 105X1000] had any IE i Bulletins written against it in common failures elsewhere.

IE Bulletin No. 78-05 " Malfunctioning of Circuit Breaker Auxiliary 4 Contact Mechanism General Electric Model CR105X" describes the following generic problem with GE CR105X auxiliary contacts:

The specific cause for ft.ilure was binding of the plunger arm ,

due to burrs and nicks on its surface."

Although IE Bulletin No. 78-05 does not specifically state that the  !

. auxiliary contact that failed at Dresden (Model No. CR 105X1000) is- -

one of the model numbers that they suggest be replaced, S&L contacted GE, San Jose, in care of Dennis Tretheway to confirm this, j

Mr. Tretheway confirmed that G.E. Model No. CR 10SX100D is one of the auxiliary contacts identified in IE Bulletin 78-05. The  !

suggested recommended action to be taken by Licensees is shown on  !

page two of IE Bulletin 78-05 ( Appendix G).

Dresden procedure DMP 7300-5, Unit 2(3) Inspection and Maintenance of 480Y MCC Breakers /Contactors and 208V Contactors, is the +

procedure used to clean Motor Control Centers (MCCs) internal s, '

including 480 YAC contactors and auxiliary contacts. Ceco should confirm that procedure DNP 7300-5 is suitable to meet requirements of IE 8ulletin 78-05. If this is so S&L believes the failed 480 Yac contactor for the watertight vault room cooler fan 2-5700-30D can be treated as an isolated case with no additional failures

.. expected in the future. If not, Ceco should investigate this .

matter further. .

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, SL,7120, Rev. 1 Page 9 V. REFERENjE.S i A. Sargent & Lundy Drawing M-5, Revision 0

8. "CCSW Pump Room Cooler Heat Load Study," Inter-Of fice Memorandum from J. M. Nosko (PMED) to E. Schumacher (EPED) and M. D. Stout (HYAC), dated February 2,1988. .

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C. Standard Review Plan 6.2.1.5, NUREG-0800, Branch Technical Position  !

CSB 6-1. Table 2 " Heat Sink Thermophysical Properties", p 6.2.1.5-

8. Rev. 2, 1981.

• D. DIT-DR-HYAC-0014. "Contaf nment Cooling Service Water (CCSW) F;mp l Room Heat Load Study" E. " Primary Containment Service Water Coolers", NYACD /,alc. No. .. ,

HV86-1, Rev. O. July 11, 1986.  !

F. DIT-DR-EPED-0192-00, " Additional Electrical Equipment in CCSW Pump Rooms for HVAC Considerations."  ;

G. Buf falo Forge Drawing No. 7C-64356, Rev. A March 15, 1973, i i

H. Containment Cooling Service Water Pump Room Heat Load Study-Kickof f Meeting," Interoffice Memorandum from B. Pesha (HVACD) to J. M.

Nosko (PMED), dated April 8,1988.  !

1. "Dresden Station, Units 2 & 3 Cubicle Coolers," Letter from S. O.

Johnson (Buffalo Forge Co.) to P. M. Mehrotra (Sargent & Lundy),

dated January 8,1973.

J. Kays, W. M. and London, # Water Pump Cooler Fan Motors 2(3)-5700-30A-0."

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SL-7120 Rev. 1 Page 10

. , K. IE Bulletin NJ. 78-05 " Mal functioning of Circuit Breaker Auxiliary '

Contact Mechanism - General Electric Model CR 105X, dated April 14 ' .

1978.  ;

L. G.E. response to IE Bulletin No. 78-05, dated April 14, 1978.

M. Telephone Conversation Memorandum between D. Tretheway (G.E.) and S. P. Cevigney (S&L) dated April 28, 1988.

N. DMP 7300-5, Unit 2(3) Inspection and Maintenance of 480V MCC  ;

Breakers /Contactors and 208V Contactors, Revision 8.

O. DIR 12-02-87-136-00, Orderly Unit Shutdown Initiated Oue to Inoperable 28 LPCI and 22C CCSW Pumps, dated 11-4-87.

P. " Containment Cooling Service Water Cubicle Heat Load Study" NSLO ..

Calc. No. 3C2-0488-001, Rev. O, dated June 14, 1988.

1 Q. DIT-DR-CQD-510109-00, " Operability of Containment Cooling Service Water Pump Motor 2(3)B-1501-44 and 2(3)C-1501-44" and DIT-DR-C00-510108-00, " Operability of Containment Service Wa ter Pump Cooler Fan Motors 2( 3)-5 700-30 A-0."

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SL-7120 Rev. 1 Page 11 (FINAL PAGE)'

, , SARGENT & LUNDY Prepared by : G#t( Date: /2r NS

. T. J. Kane Senior Safeguards Engineer

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Nuclear Safeguards. & Licensing Division 11h n Date: O 12., IW8 S. P. Cevigney' g 0 Electrical Engineer Electrical Project Engineering Division Reviewed by: -

a-Dates M /2v ITM B. Pesha HVAC Project Engineer Heating, Ventilating and Air Condition Division Approved by: Jk e Date: '7 6!$f J. M. Nosko Project Manager Project Management & Engineering Division O

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- Attachmsnt G ,

NITED STATES Paga 1 of 3 l

i WASHINGlun, D. s. it,ssa April 14, 1978 IE Bulletin No. 78-05 MALFUNCTICNING 0.c CIRCUIT i,M.AKER AUXILIARY CONTACT MECHANISM -

GENERAL ELECTRIC ICDEL CR10SX Description of Circumstances:

The Sacrad.anto Municipal Utility District recently reported a problem encountered with the operation *of the GE .% del CR105X auxiliary contact mechanism installed in a 480 volt circuit breaker. Investigation into

, . the causa for the inability to shutdown 6 booster supply fan (SF-A-7) in the control roos emergency air conditioning system revealed that an .

, auxiliary contact (GE Hodel CR105X) had failed in the closed positioni preventing the fan'.s power. supply circuit breaker from opening. The specific ccuse for failure was binding of the plunger ann due to burrs } ..

and nicks on its surface.. .

An investigation was conducted by the Itcensee to determine the extent of usage of this type auxiliary contact in other circuits throughout the reactor power' plant. Approximately fifty (50) positions in the nuclear ..

service motor control centers were identified as having a similar type auxiliary contact mechanism. It was also determined that many of.the affected systems which require contact operation similar to that described above, either permit or provide a safety feature function during emergen:y conditions. An example of this type appiteation is auxiliary contacts that must open to permit closing of certain safety related valves from 480 volt motor control centers. ,

- The attached GE Service Advice Letter and associated. instruction / drawing sheet were sent to all nuclear power reactor facilities by GE Field ,

Service Offices. The letter, together with the instruction / drawing sheet identifies the problem and provides the reconmended gorrective ac. tion. .. .

• o-l Action To Be Taken By Licensees: ,,

For all power reactor facilities with an operating license or construction ,

permit: .  ;

s l of 2 y

> y c-6 PROBLEM HARD COPY

.nioi

~ .

MttECECn3 0 '

. ~.[ IE Bulletin 7s-05 April 14, 1978 . ';

Paga 2 of 3 ,

~

1. ' If you have received the enclosed General Electric let'r.- and .

I l

instruction / drawing sheet addressing the auxiliary contact .

• mechanism problem, and if you have these devices in use at your factif ty, it is requested that you describe what correc- '

tive action you have taken. .

2. 'If you' have not' received the enclosed GE documents before, it is .

requested that you describe what action you plan to take if the .

GE CR105X auxiliary contact mechanism is in~ use or planned for use in safety systems at your facility (tes). ,

3. Facijf ties having an operating license shoMd report in writing, within 45 days, and facilities with construction permits within .

l 60 days, the.results of action taken or planned with regard to l Items 1 and 2 above. Your written reply should also include the date when such actions were or will be coepleted.' Reports should be submitted to the Of rector of the appropriate NRC Regional office and a copy should be forv.arded to the'U. S. Nuclear Regulatory Comission. Office of Inspection and Enforcement.

- Division of Reactor Operations Inspection, Office of; Inspection  !

and Enforcement, Washington, D, C, 20555. .

l Approved by GAO, B180225 (S0072); clearance expires 7/31/80. Approval was given under a blanket clearance specifically for identified generic problems.

Attachments: l

1. GE Letter 1

. 2. .GE-Gontrol-and4nstreicn *

, 1 Sheet 'l.

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August 3, 1988

Subject:

Dresden Station Units 2 and 3 CCSW Pump Room Cooler Heat Load Study AIR 12-87-37

Reference:

Letter dated 7/21/88 from W.B. Fancher to E.D.

Eenigenburg;

Subject:

Final Report-P.evision 1 l

To: E.D. Eenigenburg Station Manager ',

The above referenced letter stated that one CCSN pump can continue to operate if one out of four fans are inoperable with an entering cooling water temperature of 95 degrees F. This is not a true statement. The statement should have read that for or.e CCSW pump operation, only one out of four fans is required to be operable with an entering cooling water temperature of 95 degrees F.

If there are any further questions, please contact me on extension 2834.

Prepared by:

' S.

Powers 7 .3///

/Date BWRED Engineer Approved by:

W.

Fancher fo f[/

tate Pr act Engineer Dresden/ Quad Cities .

9%'.r cc: E. Zebus J. Mcdonald J. Achterberg 2. Boxer M.* Korchynsky W. Fancher M. Reed M. Schriam J. L3zelek =T Brunner 9

=+

_____ _________-_O

ry- _ . . r; y y- -

j July 21,'1988

Subject:

Dresden Station Units 2-and 3

• CCSW Puamp Room Cooler.

Heat Imad Study AIR No. 12-87-37 Final Renort-Revision l'

Reference:

Letter dated July 12, 1988 from J.M. Nosko (S&L) to S.P. Powers To: E.D. Eenigenburg i I

Station Manager The attached above referenced letter provides revision 1 to the final report that addresses the subject AIR. The purpose of this transmittal is to-provide clarification as to the number of fans that are required to be operable during two CCSW pump operation. The results indicate that two CCSW pumps can operate if one cooler fan associated with each CCSW pump is operable (two cooler fans out of eight) with an -.

entering cooling water temperature of 95 degrees F. Also, similiarly one CCSW pump can continue to operate if one out -

of four fans are inoperable with an entering cooling water temperature of 95 degrees F.

1 Also in regards to the fan breaker failure problems, the 1 station should confirm that procedure DNP 7300-5 is suitable to meet requirements of I.E. Bulletin 78-05, " Malfunction of Circuit Breaker Auxilary Contact Mechanism General Electric  ;

Model CR 105X " and to preclude any future fan breaker  !

failures.

With the issue of this revision to the final report, the Station should close the AIR indicating no further action is needed by the BWR Engineering Department.

If there are any further questions, please contact me on Prepared by: 4e

' S. Powers h ~2

'Date

'/ff B Engineer Approved by- 2. . >m ~7 LC [

W . U.' Fancher Cate ' ~

/#

Prciact Engineer Attachment Dresden/ Quad Cities

• )g[;(g Copies: E. Zebus J. Mcdonald J. Achterberg Z. Boxer .

M. Korchynsky ,

W. Fancher M. Reed, M. Schrien J. Lizalek J. Brunner

.,:7 CAtomwT O Luwmr '

1 cuormaram reunene..e.

)

SS CARY MONReg StatET .

en caso, suo.oes o o.

rw a ... . . . . . . . . r l

July 12, 1999 )

Project No. 7927-36 ,

Commonwealth Edison Company Dresden Station - Units 2 & 3 Report SL-7120, Revision 1 Containment Cooling Service Water (CCSW)

Pump Room Cooler Heat Load Study Mr. S. P. Powers BWR Engineering Department Commonwealth Edison Company P. O. Box 767, 35FNW Chicago, Illinois 60690 --

Dear Mr. Powers:

Enclosed is a copy of the following report:

Report SL-7120 Containment Cooling Service Water Pump Room Cooler Heat Load Study Revision 1, July 12, 1988 This report was revised to include Commonwealth Edison % comments -

and it is being re-issued in its entirety.

The objectives of this study were:

e To determine how long the CCSW pumps can continue to operate without exceeding their qualification temperature with various combinations of cooler fans out of service.

e To determine the reasons for the frequent fan cooler trips and to provide recommendations to eliminate this problem.

We have performed the necessary temperature transient analyses for the CCSW pump room with one and two CCSW pumps operating.

We have also investigated the reasons for the frequent fan cooler trips. The results of our evaluation indicate:

e One CCSW pump can operate if only one of four cooler fans operate, with an entering cooling water temperature of 95 F.

9 9

% m.

C RGENT Ci LUNLY

..- NGOGO . i

.~ a n em otcase .

Mr. 8,, P. Powera . July 12,1988  !

Comunonwealth Edison Company Project No. 7927-36 l i

e Two CCSW pumps can operate if one cooler fan associated with  !

each CCSW pump operates (i.e. two cooler fans oug of eight),

with an entering cooling water temperature of 95 F.

e -The cooler fan 2-5700-30D failures can be treated as an ,

isolated case with na additional failures expected as long  ;

as Dresden Procedure DMP-7300-5 is in place and is being '

followed.

It is our understanding that BWR Engineering will distribute this report per commonwealth Edison Company distribution list. If you have any questions, please contact Mr. B. Pesha at (312) 269-6794.  !

Yours very truly, J. M. Nosko Project Manager JMN BPamjb '

In duplicate Enclosure ,

Copies: I W. B. Fancher (1/0)  !

R. J. Mazza (1/1) 1 R. H. Jason (1/0)

E. Schumacher (1/1) i T. J. Kane (1/1) '

B. Pesha (1/1)

M. D. Stout (1/1) l l

e w me

. -