ML19209A676
| ML19209A676 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 08/31/1979 |
| From: | Crane P PACIFIC GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 7910050170 | |
| Download: ML19209A676 (7) | |
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J P. A.C I li' I C GAS AND E LE C T ILI C C O M P.A.NY LAW D L f'A R T t4 E rli - 7 7 UEALE s" RI E T. 31ST F LOOft. S A fi F it A f8CISCO, C Allf 0Rfil A 94106. (415) 781 4211 August 31, 1979 Director Office of Inspection Enforcement U. S. Muclear Itegulatory Commission g ?[D_.' 5.!7/Qg Washington, D. C. 20555
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Attention:
Director i
Division of Reactor Y
Construction Inspection 49 Re:
Docket No. 50-133
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'l License No. DPR-7 rg
Dear Sir:
This is in response to ID Bulletin No. 79-15, which was forwarded to us July 11, 1979 and concerns mechanical deficiencies in deep draft pumps.
The information requested for the pumps associ-ated with Humboldt Bay Unit. No. 3 is included in the at-tached Enclosure 1.
Kindly acknowledge receipt of this material on thu onclosed copy of this letter and return it to me in the enclosed addressed envelope.
Very truly yours, Philip A. Crane Jr.
Attaci. ent CC w/ attachment:
Mr.
R. H.
Engelken, Director Office of Inspection and En.orcement f
Region V 7010050t70 1110 123
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e ENCLOSURE 1 IlUMBOLDT BAY POWER PLANT UNIT No. 3 I. E. BULLETIN '<9-15 RESPONSE I.E.Bulletin 79-15 concerned deficiencies in deep draft vertical turbine pumps and requested that for each pump utilized in safety related applicationa the following be provided:
A.
Manufacturer B.
Model C.
Capacity D.
Plant Application E.
Overall Dimensions F.
Summary of Startup, Testing and Routine Maintenance IIistory C.
Operational Problecs and >Sj er Penair Erforts 11.
Longest Interval Between Corrective Maintenance I.
.'rmber of Operating Cycle During 11. Above, Duration and Operating Mode J.
L,1 gest Continrous Operation At or Near Rated Flow Thi.s information is presented below for the llumboldt Bay Power Plant Unit No. 3 (llBPP) natural circulation BWR.
I.
Deep draft pumps in safety-related appl # cations Condensate pumps No. 5 and No. 6 Closed cooling water p.mps No. 5 and No. 6 Screen wash pumps Nos 1-6 II.
Condensate Pump No.
A.
Manufacturer - Ingersoll Rand Company B.
Mode.' - APKC ': vertical three stage " Dry Pit" type C.
Capacity - G50 gpm at 430 feet TDil,,1775 rpm D.
Plant Application - Condensate pump at a BWR (llBPP Unit No. 3)
E.
Overall Dimensions - 23' 3-5/16" long (including motor) 21-7/16" diameter 12" suction 10" discharge F.
Summary of Startup, Testing and Routine Maintenance 111 story -
No. 5 condensate pump had 84% of rated flow at the design head of 450 feet when tested during the startup program in 1963.
No other problems were noted.
The mechanical seal has been replaced eight times since 1963-1110 124
t G.
Operational Problems and Major Repair Efforts - The reduced flow of the No. 5 condensate pump has not been a limiting factor.
The plant can operate up to 140 MWT on one condensate pump (license is 220 MUT).
Two major overhauls have been performed on this pump with only minor problems found.
H.
Longest Interval Between Corrective Maintenance - 39 months (June 1969 to September 1972).
I.
Number of Operating Cycles During H. Above, Duration and Operating Mode - 24 cycles, duration averaged 30-45 days, pump running near rated flow.
J.
Longest Continuous Operation At or Near Rated Flow - 5 months 1 day (August 7, 1970 to January 8, 1971); pump operable at end of run.
III. Condensate Pump No. 6 Parts A through E are the same as for condensate pump No. 5.
F.
Summary of Startup, Testing and Routine Maintenance History -
No. 6 condensate pump had 94% of rated flow at the design head of 450 feet when tested during the startup program.
The mechanical seal has been replaced seven times since 1963.
G.
Operational Problems and Major Repair Efforts - The reduced flow of the.No. 6 condensate pump has not been a limiting factor.
The plant can operate up to 140 M.JT on one condensate pump (license is 220 MWT).
One major repair was required because of a failed bearing housing which caused severe internal damage to the pump.
H.
Longest Interval Between Corrective Maintenance - 33 months (December 1969 to September 1972).
I.
Number of Operating Cycles During H -Above, Duration and Operating Mode - 19 cycles, duration average 30-45 days, pump running near rated flow.
J.
Longest Continuous Operation At or Near Rated Flow - 5 months 1c (August 7,1970 to January 8,1971), pump operable at end of run.
IV.
Closed Cooling Water Pump No. 5 A.
Manufacturer - Layne and Bowler Pump Company B.
Model - Vertical, 12 FHM, 2 stage, Open suction C.
Capacity - 1990 gpm at 95 feet head D.
Plant Application - Closed cooling water pump at a BWR (HBPP Unit No. 3) 1110 125
E.
Overall Dimensions -
16'2-1/8" long (including motor) 13 " diameter 10" discharge F.
Summary of Startup, Testing, and Routine Maintenance History -
The pump performed satisfactorily during startup testing.
One toutine overhaul was performed in 1972, at which time the pump was found to be in excellent condition.
G.
Operational Problems and Major Repair Efforts - None H.
Longest Interval Between Corrective Maintenance - No corrective maintenance has been performed on this pump.
I.
Number of Operating Cycles During H. Above, Duration and Operating M:ce - Apprcximatel:. 400-500 cycles, normally one week duration, pumping near rated flow.
J.
Longest Continuous Operation At or Near Rated Flow -
Pumps are cycled weekly.
V.
Closed Cooling Water Pump No. 6 Parts A through E are the same as closed cooling water pump No. 5.
F.
Summary of Startt 9, Testing and Routine Maintenance History -
The pump performed satisfactorily during startup testing.
Minor repacking and bearing work was performed in 1966 and 1974.
G.
Operational Problems and Major Repair Efforts - None H.
Longest Interval Between Corrective Maintenance - 97 months (November 1966 to December 1974).
I.
Number of Operating Cycles During H._Above, Duration and' Operating Mode - Approximately 200-250 cycles, normally 1 week duration, pumping near rated flow.
J.
Longest Continuous Operating At or Near Rated Flow -
Pumps are cycled weekly.
VI.
Screen Wash Pump No. 1 pp fhf? A1l%
(
A.
Manufacturer - Fairbanks-Morse U.(1 k
b B.
Model - 6927 C.
Capacity - 800gpm at 255 feet TDH 1110 126
<l D.
Plant Application - Formal use is as screen wash pump in adj acent non-nuclear unit.
Pump is capable of being used as an alternate emergency source of cooling water to the HBPP Unit 3 closed cooling water coolers.
E.
Overall Dimensions -
21'2h" long, excluding motor 6-5/8" diameter 8" discharge F.
Summary of Startup, Testing and Routine Maintenance History -
Initial startup testing on this pump was satisfactory. The pump has been routinely overhauled six times since 1956.
C.
Operational Froblems and Major Repair Efforts - In 1974 a major overhaul of this pump was required due to increased vibration, increaset chaft runout and inability to maintain packing gland leaktsc at cn r:ceptable level.
H.
Longest Interval Between Corrective Maintenance - 79 months (July 1964 to December 1970).
I.
Number of Operating Cycles During H. Above, Duration, Ope' rating Mode and Longest Continous Operation At or Near Rated Flow -
Lead scre2n wash pumps are changed weekly.
Screen wash pumps normally operate 15 minutes each 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />, or as required by high scrcen Ap.
This pump has been in service over 20 years.
VII. Screen Wash Pump No. 2 Parts A through E are the same as for Screen Wash Pump No. 1 F.
Summary of Startup, Testing and Routine Maintenance - Initial startup testing on this pump was satisfactory.
The pump has been routinely overhauled four times.
G.
Operational Problems and Fbjor Repair Efforts - The 1965 overhaul of this pump was necessitated by badly worn bearings and case rings.
In addition, the center shafts were replaced with a thicker matcrial. Other repairs have been 7.ormal considering age and use of this pump.
H.
Longest Interval Between Corrective Maintenance - 86 months (May 1965 to May 1972).
I.
Number of Operating Cycles, Duration, Mode, Etc. - Same as screen wash pump No. 1.
P00R ORIG E 1110 127
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VIII. Screen Wash Pump No. 3 Parts A through E are the same as Screen Wash Pump No. 1.
F.
Summary of Startup, Testing, and Routine Maintenrnce - Initial startup testing on this pump was satisfactory.
The pump has had five major overhauls.
G.
Operational Probleus and Major Repair Efforts - The five overhauls were performed to repair numerous minor problems, none of which was significant.
H.
Longest Interval Between Corrective Maintenance - 67 months (August 1960 to March 1966).
I.
Number of Operating Cycles. Ducation, Mode, Etc. - Same as screen wash pump No. 1.
IX.
Screen Wash Pump No. 4 Parts A through E are the same as Screen Wash Pump No. 1 F.
Summary of Startup, Testing, and Routine Maintenance - Initial startup testing on this pump was satisfactory.
Five routine overhauls have been perforued.
G.
Operational Problems and Major Repair Efforts - The five overhauls repaired only routine minor wearing problems.
One overhaul consisted of an inspection only and required no repairs.
H.
Longest Interval Between Corrective Maintenance - 87 months (September 1960 to January 1968).
I.
Number of Operating Cycles, Duration, Mode, Etc. - Same as Screer Wash Pump No. 1.
Note - Although not a major item, the overhauls of screen wash pumps No. 1 through No. 4 frequently"resulted in repairs to spider bearings and/or stuffing box' bearings.
X.
Screer. Wash Pump No. 5 A.
l'anufacturer - Worthington Ccrporation B.
Model - 2KHP-8/12-400, 4 stage, vertical, centrifugal C.
Capacity - 700 gpn at 200 feet head
~
li10 128
D.
Plant Application - Screen wash. ump in Unit 3.
Serves as source of cooling water to Unit 3 closed cooling water coolers when circulating water pumps are not operating.
E.
Overall Dimensions -
21'71 " long (excluding motor) 4 8-5/8" diameter 8" discharge F.
Fummary of Startup, Testing and Routine Maintenance History -
Initial testing of the pump was satisfactory.
Minor routine maintenance has been performed on the pump as well as three major overhauls.
G.
Operational Problems and Major Repair Efforts - in 1965 the pump failed due to a broken shaft.
This was caused by the manutecturer's rse of plain steel lock washers which were corrac=2 away.
This in turn caused the bowl section to loosen and vibrate, shearing five bolts and breaking the shaft.
In the 1967 overhaul, the No. 3 spider bearing was found to be completely gone.
The 1971 overhaul included replacement of the stuffing box, multiple bearings and a complete new shaft due to excessive wear.
H.
Longest Interval Between Corrective Maintenance - 47 months (November 1967 to October 1971).
I.
Number of Operating Cycles, Duration, Mode, Etc. - Same as screen wash pump No. 1, except that pump has been in service only 17 years.
XI.
Screen Wash Pump No. 6 Parts A through E are the same as screen wash pump No. 5 F.
Summary of Startup, Testing and Rou ine Maintenance History -
Initial start up testing of the pump was satisfactory.
In addition to routine repa;hing of the pump, all steel lock washers were removed and the element bowl flange was tightened in 1965 after the No. 5 screen wash pump failure.
G.
Operational Problems and Major Repair Efforts - Two major overhauls were performed on this pump. The problems encountered are similar to No. 3 screen wash pump; i.e.,
excessive wear on bearings and pump shaft, necessitating their replacement.
H.
Longest Interval Between Corrective Maintenance - 47 months (March 1968 to February 1972).
I.
Number of Operating Cycles, Duration, Mode, Etc. - Same as screen wash rump No. 5.
E 1110 12"9
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