ML20127N983
| ML20127N983 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 01/03/1973 |
| From: | James Keppler US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Ziemann D US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 9212010470 | |
| Download: ML20127N983 (4) | |
Text
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j UNITED STATES
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,,5 D-A /OMIC ENERGY COMMISSION i
wAsHWGTON. D.C. 20$45
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< pl January 3, 1973 t
D. L. Ziemann, Chief, Operating Reactors Branch #2, L NORTHERN STATES PCUER COMPAl# (HONTICELLO) - DOCKET No. 50-263 l
RHR PUMP MCrr0R FAILURE The enclosed Inquiry Report from our Region III (Chicago)- Office is forwarded for your information.
The report relates to the failure of a motor which drives one of the four residual heat removal pumps and cracking of air diffusers in the motors for tuo other RHR pumps. A preliminary copy of the enclosure was prcvided earlier to Jim Shua.
Ua have requested our_ Regional Offices to review the applicability considerations of this failure a ( other operatina BWR facilities -
.i with RHR systems during their routine inspections. We will inform you of any significant findings.
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J. G. Keppler, Chief Reactor Testing and Operations Branch Directorate of Regulatory Operations
Enclosure:
Inquiry Report No.
050-263/72-17Q cc:
L. R. Rogers RS J. P. O'Reilly, RO:I
~
R. S. Loyd, L (2)
J. G. Davis, RO:II R. C. DeYoung, L (2)
B. H. Grier, RO:III D. J. 3kovholt, L -(2)
N. C. Moseley, RO:IV H. R. Denton, L (2)
R. W. Smith, RO:V R. Tedesco, L G/. r'iorelli, RO:III R. Vollecr L -
Ed Central File J. Hendrie. L R.:U. Houston. L J. Carter, L J. Scoltz, L t
U. Butler L
.W. Haass, L_
.P. A. Morris, RO H. D. Thornburg, RO R. H._Engelken.-RO
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i-I' 9212010470 7301'03' PDR -ADOCK-05000263 0
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U. S. ATOMIC ENERGY COM41SSION DIRECTORATE OF REGULATORY OPERATIONS REGION III RO Inquiry Report No. 050-263/72-17Q Northern States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 Licence No. DPR-22 Menticello Nucle'ar Genera ing Plant" RER Pump Motor FailureD Prepared Ey P
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(Date)
A.
Date and Manner AEC was Informed:
Telephone en11 from Menticello Plant representative to RO III on December 18, 1972.
g B.
Description of Particular Event or Circumstance:
The motor which drives one of the four Residual Heat Removal (RER) pumps failed on December 16 during operation in the shutdown ecoling mode. Initici investigation determined that the sheet metal air diffuser in the motor hcd failed from fatigue cracking originating near the anchor bolt holes. Fragments of the air diffuser cau:cd shorting of the motor windings.
Inspection of the remaining RER motors disclosed two additional air diffusers with cracks initiated.
Severity of the cracks was proportional to the operating hours (177 to 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br />) on the motors.
Pertinent information relating to the motor is as follows:
Manufacturer General Electric Motor
Description:
Vertical, high thrust, polyphase, induction 4160 volt, 3560 RPM, 600 EP Frame No.:
6329PZ30 Scrial No.:
SK6329XC4A Additional Identification No.: EDJ522005 C.
Action by Licensee
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A reactor startup was terminated for further investigation and repair.
An outage of several days is anticipated.
ij The licensee plans to report the matter to Licensing within 10 dsys.
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Regulatory filo Cy.
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REGULATORY OPERATIONS, REGION III Oc7'O - #G.'S JU-/d ((
RO Inquiry Report No.
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T ransmittal Date Distribution:
R0 Chief, RT&OB or R0 Chief, RCB (2)
RO:HQ ($)
pR Central F4e41s ///c e2 Regulatory Standards (3)
Licensing (13)
U. S. ATOMIC ENERGY COMMISSION DIRECTORATE OF REGULATORY OPERATIONS REGION III RO Inquiry Report No. 050-263/72-16Q Northern States Power Company 419 Nicollet Avenue Minneapolis, Minnesota 53401 License No. DPR-22 Monticello Nuclear Generating Plant Inoperable Standby Liquid Control Pump
/.
Prepared By:
F. Maura,#/
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'(Da t'c)
A.
Date and Manner AEC was Informed:
Telephone call from G. Jacobson, Plant Results Engineer, to RO:III on October 12, 1972.
B.
Description of Particular Event or Circumstance:
During a routine surveillance testing of the standby liquid control pumps on October 11, 1972, the No. 12 pump f ailed to develop the re-quired system head of 1275 psig on one of two tries. On October 12, 1972, the same pump failed on one out of 4 tests.
In both cases the discharge pressure was 900 psig.
The licensee suspects that one of.
the piston's check valves maybe hanging up causing the loss in dis-charge pressure.
C.
Action by Licensee:
Ihe licensee has declared the pump inoperabic and is getting ready to disassemble it.
Pump No. 11 has been tested satisfactorily as required by Technical Specification paragraph 4.4.B.
The licensee plans to report the matter to Licensing within 30 days.
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