ML20090E158

AO 50-220/74-17:on 741227,source Range Monitor 14 Declared Inoperable.Caused by Component Failure.Detector Replaced W/Spare

ML20090E158
Person / Time
Site:	Nine Mile Point
Issue date:	01/06/1975
From:	Schneider R NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
326, 50-220-74-17, NUDOCS 8303110571
Download: ML20090E158 (7)

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NIAGA*RA MDHAWK POWER CORPORATION

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$YRACUSE, N. Y 13202 7 ,

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ifr. Karl R. Gotter '7 ;,f .

j Assistant 041cetor of: Operating Reactou ~ G :. . ,

L Directorate of Lic^ensing. & .,

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United States Atomic Energy Commission

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In accordance tcLth .the Technical Specifications for .the .

r6IT Ninc Sits Point Nuclear " Station, Unit 61, the enclosed Abnormal Ocetvatance Report (74-ET) is being subntLtted. This is in.the

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accepted-f0ionat as detailed in Regulatort) Guide 1.16, Rev. 1.

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> Y fp R.R. Schneider Vice President - Elecknic Openations s

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• i a-v' NIAGARA MOHAWK 6'OWER CORPORATION NBAGARA h MOHAWK DATE: January 6, 1975

SUBJECT:

Abnormal Occurrence Report No. 50-220 /74-17 t

The enclosed Abnormal Occurrence. Report is being submitted in accordance with Technical Specifications Section 6.

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. *ID : James P. O'Reilly ,

Directorate of Regulacory Operations l Region 1 i y 631 Park Avenuo King of Prussia, Pennsylvania 19406 t

ii' FROM: Niagara Mohawk Power Corporation Nine Mile Point - James A. FitzPatrick Site Nine Mile Point Nuclear Station- .,

P.O. Box #32 Lycoming, New York 13093 ,

, Docket 50-220 i'

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NIAGARA MOHAWK POWER CORPORATION fila G A R A - MOHAWN

SUBJECT:

- Abnormal Occurrence 10 Day Letter ,

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REFERENCE:

License DPR 17 .

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Report No.: 50- 220 /74- 17 ,

Report Date: __12/30/74 Occurrence Date: 12/27/74 s Facility: NMP #1

• l Identification of Occurrence: '

One inoperable SRM (14)

Con <litions Prior to l Occurrence: Steady State Power -Routine Shutdown-llot Standby '

X Cold Shutdown Lead Changes Refueling-Shutdown Routine Startup- Other i

e Description of the Occurrence:

' During shutd'our. surveillance testing, it was found that SRM (14);

, was inoperable. Technical Specifications Sec. 3.1.lb (4) m ires e 3 operabic Instrument Channels for startup. This LCO wa:s led .

as the other 3 Slules were operabic.

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Apparent Cause of the Occurrence: ,

Design Procedure Manufacture Unusual Service Installation /Const. Condition Operator X Component Failure

_ Other (Speciiy)

Detector failure Analysis of Occurrence:

The sourcs range monitor (SIB!) system performs no nutcrntic safety function. It does provide the operator with a visual indication of neutron icyc1 which is needed for knowledgeable and officient reactor startup at low neutron levels and it also provides rod withdrawal blocks to the Rod Control System. The results of reactivity accidents are functions of the initial neutron flux. One operable SIBl channel would be adequate to n.unitor the approach to critical using homogeneous patterns of scattered control rods. A minimum of three operebic S101's is required as an added conservatism.

Therefore, it can be concluded that one S!31 being inoperabic would not have prevented the performance of the intended function of the SkM system. Further, no hazard would have been prescuted to the plant safety or health and welfare of the general public from this event.

Corrective Action:

Dctcctor was replaced with spare and system response to neutrons was verified.

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. NIAGARA MoliAWK POWER CORPORATION

. A NIAGAHA ([h MOHAWn

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r DNDI: December 30, 1974 SUDJECT: Abnormal Occurrence Report No. 50-220 /74-17 The enclosed preliminary A0n is beinst sutsnitted in accordance with Technical Specifications Section 6.

TO: James. P. O'Rollly .

Directorate of itegulatory Operations Region 1 631 Park Avenuo -

King of Prust.in, Pennsylvkuin 19405 PROM: Nipp, ara }1ohouk Power Corporation L;.Y Nino 14110 Point - Jamon A. FitzPatrick. Site

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Nino V,ile Point Huc1cor Station P.O. tiox f32 Lyconirg, Now York 130D3 4

Docket 50-220 i

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t NIAGANA MOHAWK T'OWER CORPORATION NIAGAHA ( MOHAWK SIMVl'CT: Abnottal Occurrence 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Notification Confiming _ Mr. c. Stuart phone conversation with _ Mr. Y. Shodlosky AbC 80:I office on 12/27/74 ___ .

finPentr4CU: Licenso DPR _17 .

Report No.: 50- 220 /74-17 .

'Roport Dato: 12/30/74 Occurrence Dato: 12/27/74 Facility: fa:i' it 1

, Idontification of Occurrence:

Ono inoperablo SRM (14)

Conditions Prior to Occurroncc: St er.dy !;tato ' Power Routino Shutdown 110t Standby X Cold Shutdown Losd Cimnges Hofueling Shutdown itoutino Startup Other Description of the Occurrenco:

Durin,y shut.down surveillance testing, it was found that S}U4 (14) was i_noperable._ Technical Specifient. ions Soc 3.1.lb (4) requires X~5perable Instruront channeln for start.up. This :.C0 was natir.fied as the other 3 GPJ4's were operable.

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' 1,l O O Apparent cause of the occurrencer Desinn Procedure Hanufacturo Unusual Service Installation /Const. Condition Operator X Conponent Failure -

Other (Specify)

Detector failuro Analysis of Occurrence:

• Ihe source range nonitor (SnM) system perforns no auto:mtic safety function. It does provide the oppreitor with n visual indiention of neutrca lovel which is needed for knowledgeable and officient reactt.y startup at low neutron .Isvoin a und it also-providon rod withdrauni blocks to the 1:00 Control System. 'The results of reactivity accidents are functionr of the 2nitial neutron finx, One operobic SM1 channel would be odoquate to

onitor the spproach to critient usinp, hur,ogencous patterns of scattered control rods. A 12ininu.4 of three operatobo S3Ws is required as on added conservatir.n.

Thereforo, it etin ho concluded that one SiO! being inoport.ble would not huvo prevented the perfomunce of the intended function. ~

of the SPJ4 r;yntm. Further, no hnard would have been prer.ciated to the plant safety or health and welfare of the generni public from this event.

Corrective Action:

Detector replaced Failuro Data:

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