05000321/LER-1981-079-03, /03L-0:on 810713,pump P41-C001C Failed to Meet Acceptance Criteria for Total Dynamic Head.Caused by Wear & Erosion.Pump Removed & Rebuilt

/03L-0:on 810713,pump P41-C001C Failed to Meet Acceptance Criteria for Total Dynamic Head.Caused by Wear & Erosion.Pump Removed & Rebuilt

ML20009H536
Person / Time
Site:	Hatch
Issue date:	07/30/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009H531	List: 05000321/LER-1981-079, Forwards LER 81-079/03L-0 05000321/LER-1981-079-03, /03L-0:on 810713,pump P41-C001C Failed to Meet Acceptance Criteria for Total Dynamic Head.Caused by Wear & Erosion.Pump Removed & Rebuilt
References
LER-81-079-03L, LER-81-79-3L, NUDOCS 8108100218
Download: ML20009H536 (2)

LER-1981-079, /03L-0:on 810713,pump P41-C001C Failed to Meet Acceptance Criteria for Total Dynamic Head.Caused by Wear & Erosion.Pump Removed & Rebuilt

Event date:
Report date:
3211981079R03 - NRC Website

text

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NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77k-t LICENSEE EVENT REPORT control BLOCK: l l

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68 69 EVENT DATE 74 76 REPORT OATE 80 EVENT DESCRIPTION AND pro 8ABLE CONSEQUENCES h 10 21 10n 7-13-81, duri ng normal operation pump P41-C001C failed to meet accep-l 1013; I tance criteria for total dynamic head in accordance with surveillance l

i 10141 l procedure HNP-1-3182. Plant Service Water Pump __0perability.

Tech Soecs l 0 s Isurveillance reauirements 4.5.J.2.b were immediately executed and a 30- l repetitive event last reoorted by LER 50-l 10161 1 day l_ C0 declared.

This is a 10171 1 321/1980-025.

There were no effects uoon oublic health and safety due 1

d l 10181 I to this event.

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33 J4 36 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 111011 The DumD was removed and a rebuilt unit substituted.

Inspection of the I

!ililIremoved pump revealed wear and erosion consistent with units oDeratina i

li 211 in similar environments at end of normal life cycle.

The sytem was I

iretested successfully, and the unit is now in full compliance; no fur-l i

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912-367-7851

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s LER #:

50-321/1981-079 Licensee:

Georgia Power Company Facility Name:

Edwin I. Ilatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-079 On 6-22-81, during normal operation pump P41-C001C failed to meet acceptance criteria for total dynamic head in accordance with surveillance procedure HNP-1-3182, Plant Service Water Pump Operability.

Surveillance was being performed at more frequent intervals on this pump as required by IINP-1-3182 due to decreasing performance.

Tech Specs surveillance require-ments 4.5.J.2.b were immediately executed and a 30-day LCO declared.

The pump was removed and a rebuilt unit substituted.

Inspec-tion of the removed pump revealed that the suction-bowl seal ring had broken loose from the bowl and was fastened around the suction-impeller seal ring.

This was caused by the high sand content of the pumped fluid.

Normally there is.026 -

.030 inches clearance between the seal rings.

In addition, excessive wear was found at the pump shaft bearing surfaces.

Accelerated deterioration of river water pumps at the site is anticipated due to the crosive nature of the Altamaha river water.

This pump had been serviced 3 years earlier, thus exhibiting a normal pump life cycle.

The plant service water pump operability procedure was reper-formed with satisf actory results.

This is a repetitive event last reported by LER 50-321/1980-026.

There were no effects upon public health and safety due to this event.

The unit is now in full compliance, and no further action is required.