ML19209A206

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Forwards Response to IE Bulletin 79-15, Deep Draft Pump Deficiencies
ML19209A206
Person / Time
Site: Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  Constellation icon.png
Issue date: 09/05/1979
From: Reed C
COMMONWEALTH EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
NUDOCS 7910030125
Download: ML19209A206 (20)
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Text

7^/ c Commonwealth Edison One First National Plaza. Chicago, lihnois Address Reply to: Post Office Box 767 Chicago, Illinois 60690 September 5, 1979 Attention:

Director, O

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Division of Reactor Construction D

1 Inspection g

U.S. Nuclear Regulatory Cousnission Office of Inspection and Enforcement

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A Washington, D.C.

20555 3 1

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Subject:

Response to I.E.Bulletin 79-15,

" Deep Draft Pump Deficiencies" Dresden Station Units 1, 2 and 3; Quad-Cities Station Units 1 and 2r Zion station Units 1 and 2r LaSalle County Station Units 1 and 2; Byron Station Units 1 and 2r and Braidwood Station Units 1 and 2 NRC Docket Hos. 50-10/237/249, 50-254/265, 50-295/304, 50-373/374, 50 "4/455, and 50-456/457 Reference (a) :

J. G. Keppler letter to Byron Lee, Jr.

Jated July 11, 1979.

Dear Sir:

Reference (a) transmitted I.E.Bulletin 79-15 concerning

" Deep Draft Pump Deficiencies".

The cczamonwealth Edison response to that bulletin is provided in the attachment to this letter.

In the event further question should arise in this regard, please direct them to this office.

Very truly yours, (Signe$ CORDELL REED

~

Cordell Reed Assistant vice-President y

Attachment 1083 096 cc Director, Direct ^ rate of d

y Inspection and Enforcement - Region III

$k 7910030 / 2 7 9

MTTMUMMENT Dresden 1 Response I.E.

Bulletin 79-15 PUMPS:

Post Incident Pumps (G-142A, G-142B)

MANUFACTURER:

Layne & Bowler Pump Co.

MODEL:

10-RM CAPACITY:

600 GPM @ 320 Ft. Total Head (Each Pump); Each Pump Capaole of System Capacity to Provide Redundancy APPLICATION:

Containuent Spray /Long Term Cooling DIMENSIONS:

(See Figure 1)

MAINTENANCE:

No Maintenance Has Been Required Since Installation OPERATIONAL PROBLEMS / REPAIRS:

None Pre-operational tests showed that the original oil lubrication system did not have sufficient capacity to overcome packing gland leakage.

Consequently, the system was changed to a pressurized water lubrication system.

Changing to a p'essurized water lube system r

necessitated the following changes to each pump:

1) 416 stainless steel line shafts and head shafts 2)

Four slinger rings (for protection of packing)

During pre-operational testing, temporary ' ping was installed to permit testing at higher flow rates than is nossible with normal system piping.

Flow meters were installed in tue temporary piping for flow measurement.

The pre-operational test results showed that the pump flow rates for both pumps were adequate to meet system design requirements.

Pump vibration was normal.

The Post Incident pumps are tested once per month and run for ten minutes during each test.

No flow meters exist on the system to deter-mine if the pumps are at rated flow (flow measuring devices are curren-tly being installed).

During the operational tests of the pumps, water is added to the pump suction until pump discharge pressure becomes steady; the pump is then run for ten minutes and vibration measurements taken.

No operational problems have occurred.

The pumps have been available for operation without corrective maintenance since unit start-up (July, 1960).

The longest each pump has been run (near rated flow) was two hours.

At the end of each run, both pumps were in good operating order.

1083 097

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ATTACIB1ENT Dresden 1 Respense (Cont.)

I.E.Bulletin 79-15 PUMPS:

HPCI Injection Pumps (K-6123A, K-6123B)

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MANUFACTURER:

Ingersoll-Rand, Cameron Pump Division MODEL:

D-12 x 20 KD-8 CAPACITY:

6000 GPM @ 1300 ft. Total Head APPLICATION:

ECCS High Pressure Coolant Injection DIMENSIONS:

(Se., Figure 2)

MAINTENANCE:

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OPERATIONAL PROBLEMS / REPAIRS:

None Both pumps have been performance tested and installed on site One pump,'in addition to the normal waiting preoperational testing.

was run at full flow conditions for eight continuous performance test, No hours after which an additional performance test was performed.

degredation in pump performance or vibration was detected when test results were compared.

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ATTACW1ENT DRESDEN - UNITS 2 & 3 RESPONSE I.E. BULLETIN 79-15 There are no deep draft pumps used in safety related systems at these facilities. e 0 1083 101

ATTACHMENT Zion Station Response to IE Bulletin No. 79-15 1. At Zion Station there are six (6) deep draft pumps, three per unit, similar to those shown in Figures 1 and 2 of the Bulletin utilized in safety related applications. 2.- Manufacturer: The Singer Co., Layne and Bowler Division. Model: 42" RKHC Serial Numbers: 61031, 61032, 61033, 61034, 61035, 61036 0 U Capacity: 22,000 gpm, 32 -80 F water at 100 psig discharge pressure. Application: Service Water Pumps - provide cooling uater to various primary and secondary plant compo-nents and heat c2: changers. 3. Dimensions: A. Total vertical length: 48 feet from the motor support base to the bottom of the suction bell. 1. vertical length of the three bowls (stages of im-pellers) : 11 feet, 10 inches. 2. The vertical length of the entire shaft from the suction bell to the pump base plate bottom is 42 feet, 5 inches. B. Suction bell diameter: 40 inches C. Discharge pipe diameter: 24 inches D. Pump weight: 24,850 lbs. E. Total developed head at rated flow: 210 feet F. Shut off head: 309 feet G. Pump develops 1342 BHP at rated conditions. 1083 102

4. A. Startup (Preoperational) Testing The startup testing program for the service water pumps demonstrated the following items: 1. The pump capacity was measured and it was verified that measured capacity was within 10% of the manu-facturers curve of various flows and pressures. Also, proper motor running current was verified. 2. It was demonstrated that any pump alone could supply needed cooling water to all essential (safety-related) loads at the minimum required pressure. (22,000 gpm at 69 psig) 3. It was demonstrated that any two-pump combination could supply needed cooling water for all (essential and non-essential) loads at minimum required pressure (44,000 gpm at 75-95 psig). 4. It was demonstrated that all ~ pump controls, inter-locks, and auto-start features operated properly. 5. During this testing, required flows to all loads were established. B. Routine Testing Monthly, in accordance with Technical Specification 3.8.7, the pump combinations are switched such that all pumps are run for a period of four hours. Service water header pressures are read and recorded at the beginning and end cf each period. C. Routine Maintenance 1. During refueling outages, the pump motor's bearing oil is changed. 2. Pump vibration readings are taken and evaluated semi-annually.

5. A. Operational Problems To date the service water pumps at Zion have been extremely reliable.

There have been no instances of " pump failure". Most of the problems to date have centered around the bearing lubrication water system and its seal (upper bearing packing). For example, the lubrication water injection pressure often drops below the manufacturer's specification, recuiring frequent adjustment, or sometimes outright replacement of the packing in order to reduce leakoff of the water, and to bring the pressure back into specification. 1083 103 B. Major Repair Efforts This packing had, over a period of a few years, worn grooves into the pump shafts, requiring replacenent of the top section of pump shaft, then modification with protective shaft sleeves to take up the wear caused by the packing. The Fleeves can be removed and replaced in the future without pump disassembly. These modifi-cations were completed in 1977 for both units. In addition, it was observed during punp disassenbly for the above modifications that the bearing water lubri-cation lines within some of the pumps were broken. These lines were replaced with flexible wire braid hose. The resultant loss of adequate lubrication water due to the broken lines caused excessive wear of some of the bearings. Those affected were replaced. No other major repair efforts to the pumps has occurred. 6. Reliability and Longest Operation Pump availability is summarized below: Service Water Longest Operating Pump Interval Available Duration Mode 1A 10/28/75 - 10/20/77 722 days rated flow 1B 12/31/73 - 9/19/77 1401 days rated flow 1C 12/31/73 - 4/23/76 844 days rated flow 2A 3/14/77 - present 900 days

  • rated flow 2B 3/24/77 - present 890 days
  • rated flow 2C 6/05/78 - present 452 days
  • rated flow
  • Based on present = 9/1/79 The number of cycles of operation during these longest inter-vals, and the duration of these cycles cannot be determined because this information is not recorded.

However, the total number of pump running hours is available from the pump breakers and is as follows: Pump Hours lA T5387 1B 39649 lc 39932 2A 38076 2B 32201 2C 32763 ,1083 104 _3_

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  • ATTACHMENT QUAD-CITIES UNITS 2 & 3 RESPONSE I.E. BULLETIN 79-15 There are no deep draft pumps used in safety related systems at these facilities.

e 1083 106

ATTACHMENT LA SALLE COUNTY UNITS 1 & 2 RESPONSE TO I.E. BULLETIN 79-15 PUMPS: Six RHR Pumps (three in each unit) MANUFACTURER: Ingersoll-Rand, Cameron Pump Division MODEL: 29 APKD-3 CAPACITY: 7450 GPM @ 280 Ft. Total Head (each pump) APPL (CATION: Residual Heat Removal DIMENSIONS: (see Fig. 4) MAINTENANCE: (see below) OPERATIONAL PROBLEMS / REPAIRS: (see below) Since the LaSalle County Station is under construction, the deep draft pumps have no real " operating" history. However, various defects - as noted in the IE Bulletin No. 79 were spotted during construction (Information concerning these pump problems has been provided in previous deficiency reports to the NRC - see NCR #195,200,217). As a result, the pumps were returned to Ingersoll-Rand for reworking / replacement. At this time, two of the six RHR pumps have been reinstalled. Testing will begin when all the pumps have been reinstalled. S 1083 107

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ATTACHMENT LA SALLE COUNTY UNITS 1 & 2 RESPONSE TO I.E. BULLETIN 79-15 LASALLE PUMPS: Two HPCS pumps (one in each unit) MAN,UFACTURER: Ingersoll-Rand, Cameron Pump Division MODEL: 12 X 20 KD-8 CAPACITY: 6942 GPM @ 662 Ft. Total Head APPLICATION: High Pressure Core Spray DIMENSIONS: (See Fig. 5) MAINTENANCE: (See below) OPERATIONAL PROBLEMS / REPAIRS: (See below) Since the LaSalle County Station is under construction the deep draft pumps have no real " operating" history. However, various defects - as noted in the IE Bulletin 79 were spotted during construction (Information concerning No. these pump problems has been provided in previous deficiency re-217, 218, 219). As a result, ports to the NRC - see NCR # 214, the pumps were returned to Ingersoll-Rand for reworl:ing/ replacement. At this time, the HPCS pumps have not been reinstalled - testing will begin once the reinstallation has be completed. 6 1083 109

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ATTACHMENT LA SALLE COUNTY UNITS 1 & 2 RESPONSE TO I.E. BULLETIN 79-15 LASALLE PUMPS: Two LPCS pumps (one in each unit) MANUFACTURER: Tngersoll-Rand, Cameron Pump Division MODEL: 29 APKD-5 CAPACITY: 6350 GPM G 725 Ft. APPLICATION: Low Pressure Core Spray DIMENSIONS: (See Fig. 6) MAINTENANCE: (See below) OPERATION PROBLEMS / REPAIRS: (See below). Since the LaSalle County Station is under construction, the deep draft pumps have no real "operatin" history. However, various defects - as noted in the IE Bulletin 79 were spotted during construction (Information concerning No. these pump problems has been provided in previous deficiency 200, 217, 238, 240). As a reports to the NRC - see NCR #195, the pumps were returned to Ingersoll-Rand for reworking /

result, replacement.

At this time, the LPCS pumps have not been reinstalled testing will begin once the reinsta11ation has been completed. c, 1083 111

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ATTACHMENT BYRON UNITS 1 & 2 RESPONSE TO I.E. BULLETIN 79-15 BYRON PUMPS: Two Essential Service Water Makeup Pumps MANUFACTURER: Johnston Pump Co. MODEL: Model JT CAPACITY: 1500 GPM @ 385 Ft. (each pump) APPLICATION: Essential Servie Water Makeup DIMENSIONS: (See Fig. 7) MAINTENANCE: None OPERATIONAL PROBLEMS / REPAIRS: None Since the Byron Station is under construction, the essential service water mr.keup pumps have no " operating" history. The pumps have been installed. However, no tests have been run on these pumps since the power supply (a diesel generator) has yet to be installed. 1083 113

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ATTACHMEITI' BRAIDWOOL UNITS 1 & 2 RESPONSE TO I.E. BULLETIN 79-15 There are no deep draft pumps used in safety related systems at these facilities. e 0 1083 115}}

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