05000272/LER-1979-068, Supplemental LER 79-068/03X-1:on 791018,safety Injection Pump Motor 12 Tripped on Overcurrent.Caused by Impeller Locknuts Improperly Secured at Mfg Facility.Pumps Reassembled Using Locktite Compound

Supplemental LER 79-068/03X-1:on 791018,safety Injection Pump Motor 12 Tripped on Overcurrent.Caused by Impeller Locknuts Improperly Secured at Mfg Facility.Pumps Reassembled Using Locktite Compound

ML20087A872
Person / Time
Site:	Salem
Issue date:	02/24/1984
From:	Rupp J, Zupko J Public Service Enterprise Group
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-79-068-03X, LER-79-68-3X, NUDOCS 8403080252
Download: ML20087A872 (4)

LER-2079-068, Supplemental LER 79-068/03X-1:on 791018,safety Injection Pump Motor 12 Tripped on Overcurrent.Caused by Impeller Locknuts Improperly Secured at Mfg Facility.Pumps Reassembled Using Locktite Compound

Event date:
Report date:
2722079068R00 - NRC Website

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES O'o O 2 lOn October 18, 1979, during a refueling shutdown, while performing routine surveillancq The pump shaft g gtesting, No. 12 Safety Injection Pump motor tripped on overcurrent. g

[ g ;could not be turned by hand, and the pump was disassembled; the impeller locknuts j g 3 ,were loose. Investigation revealed similar problems with 2 of the 3 redundant pumps y The I aps were reassembled using Locktite compound with concurrence 0 6 l in Unit 1 and 2.

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42 l "I@ l "I I "O O 43 44 4F CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h lThe impeller 1ocknuts were not properly secured at the manufacturing facility.

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- Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station February 24, 1984 U.S. . Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Dear Sir:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 79-068/03X-1 SUPPLEMENTAL REPORT Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specificat' ons, Section 6.9.1.9.d, we are submitting supplemental Licensee Event Report for Reportable Occurrence ~79-068/03X-1.

3 Sincerely yours, J . M. Zupko, Jr.

General Manager -

Salem Operations JR:kilp6[

CC: Distribution

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The Energy People

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l k l Report Number: 79-068/03X-1 Report Date: 02/24/84 Occurrence Date: 10/18/79

- Facility: Salem Generating Station Unit 1 Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

ECCS Subsystem Inoperable - (No. 12 Safety Injection Pump Inoperable)

- This report was. initiated by Incident Report 79-386 CONDITIONS PRIOR ___TO O_CCUREJLQE:

Mode 5 - Rx. Power 000 % - Unit Load 0000 MWe DESCRIPTION OF-0CCURRENCE:

On-October 18,1979, -during a refueling shutdown, while performing routine surveillance testing, No. 12 Safety Injection Pump motor tripped on overcurrent. The motor was meggered, with satisfactory results. The pump was uncoupled from the motor; the motor rotated

. freely,-but the pump could not be rotated by hand. The-pump was disassembled for internal inspection.-

The radial and thrust impeller locknuts were'found to be hand tight, the impeller spacer sleeves were worn'and the impeller shaft was slightly' bent. No. 11 Safety Injection. Pump'was also disassembled and inspected; its impeller locknuts were also loose, . although :the pump was not damaged. In Eddition, Unit 2 Safety Injection Pumps were also disassembled.

Inspection; revealed that No. 22 Safety Injection Pump impeller locknuts were loose; the locknuts on No. 21 were found to be secured

' with set screws.-

l APPARENT CAUSE OF OCCURRENCE:

! The impeller locknuts were never properly secured at the manufacturing L facility.

ANALYSIS OF OCCURREELE:-

1 Unit 2 was not yet operational, and No. 12 Safety Injection Pump (Unit

1) was found to be_ inoperable while the reactor plant was in Mode 5

.-The pumps are not required for safe plant operation, while in Mode 5 The' Charging / Safety. Injection Pumps were operational throughout the occurrence'. Because of the abnormal system _ degradation, and the

- possible. generic implications, the event was reported in accordance

. withETechnical' Specification 6.9.1.9.d.

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I LER 79-068/03X-1 ,

CORRECTIVE ACIIQH: 1 The pump manufacturer was contacted, and advised PSE&G against any method of mechanically securing the locknuts. The setscrews in No. 21 pump impeller locknuts were installed by mistake at the manufacturing ,

facility, and the rotating element was sent back to the manufacturer J for rework. The rotating element from No. 22 Safety Injection Pump j was installed in No. 12 Safety Injection Pump. No. 12 Safety  !

Injection Pump was reassembled, tested and returned to service on i November 2, 1979. The locknuts of all safety injection pumps were secured with the use of Locktite compound, per PSE&G Engineering Department recommendation, with concurrence from the pump manufacturer.

Subsequently, PSE&G received Burl Letter 40-39, dated November 12, 1981, with a new Safety Injection Fump Operating and Maintenance Manual. One of the items added to the new manual was instructions for reassembling the pump impeller locknuts using Locktite Compound Number 242. Maintenance Procedure Number M6M (Safety Injection Pump Disassembly, General Maintenance and Reassembly) was changed to reflect this action.

Since the initial occurrence, and the reassembly of all Safety Injection Pump impeller locknuts using the Locktite compound, there have been no similar problems encountered. Subsequent inspections of the pumpa have also revealed no reoccurrence of the problem.

FAILURE DATA:

Safety Injection Pump Horizontal, Centrifugal, 10 Stage Pacific Pumps, Inc.

Prepared By J. L. Ruoo .

6'nefal e Man 6ger -

Salem Operations SORC Meeting No.84-024