ML20090C449
| ML20090C449 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 11/26/1975 |
| From: | Schneider R NIAGARA MOHAWK POWER CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20090C453 | List: |
| References | |
| 13538, 13949, AO-75-031, AO-75-31, NUDOCS 8302180076 | |
| Download: ML20090C449 (3) | |
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NIAGARA MOHAWK POWER CCRPORATION I
NIAGARA MOHAWK i-I' DATE:
November 26, 1975 c
SUBJECT:
Abnormal Occurrence Report No. 50 220 75 31 (10 Day Letter)
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The enclosed Abnormal Occurrence Report is being submitted in accordance with Technical Specificat.on.Section 6.
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TO:
James P. O'Reilly Directorate of Regulatory Operations Region 1
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631 Park Avenue King of Prussia, Pa.
19406 FROM:
Niagara Mohawk Power Corporation Nine Mile Point - James A. FitzPatrick Site P.O. Box #32 Lycoming, New York 13093 Docket No. 50- 220
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REFERENCE:
License DPR-63 Report No.: 50- 220/75-31
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Report Date: 11/26/75 Occurrence Date: 11/14/75 Facility:
NY NMP #1 Identification of Occurrence:
Failure of both radiation monitors located in the Reactor Building l-Ventilation Duct to provide a transfer to Emergency Ventilation System at 5 mr/hr.
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l 8302100076 751126 PDR ADOCK 05000220 S
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AOR 75-31 N
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v Conditions Pricr to e'
Occurrence:
Steady State Power
' Routine Shutdown l-s Hot Standby-Cold Shutdown.
Load Changes
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-Refueling Shutdown i
Routine Startup '
Other Description of the Occurrence:
' Durin'g routine radiation protection surveillance testing, both e
l radiation monitors in the Reactor Building Ventilation Duct fail'ed to provide l
- transfer to kmergency Ventilation System until 20 mr/hr and 30 mr/hr resfectively-
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was applied to the sensors. The cicetronic calibration had just previously been performed.
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5 Apparent Cause o'f the Occurrence:
l Design X
Procedure l
Manufacture Unu,sual Service Condition Installation /
Const.
X Operator Component Failure Other (Specify) e
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l Analysis of Occurrence:
During refueling operation, the radiation monitor' located on the refueling platform will also cause a tran.fer to Emergsney Ventilation. The plant has been in refueling since September 11, 1975. Thus protection for the public was adequately supplied by this monitor in the event of a dropped fuel assembly.
P orrective Action:
i The investigation revealed that an inadvertant adjustment was made to these instruments prior to their calibration.
Better coordination be-tween the verification of trip point and the electronic alignment will be implemented, and should prevent this in the future. Additional administra-tive controls,wil.1 be imposed for this type of calibration.
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Failure Data: -
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NIAGARA MOHAWK
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bit. James P. O'Reitig 8
'9 Directorate of Regulatory,0perations
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United States Nuctcar Regulato.tt) Connission ip OEC3 Q
631 Park Avenue l97$ g,-
King of Prussia, Pa.
19406 u.s.
RE: Docket No. 50-220 s
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Dear blt. O'Reitty:
Enclosed ptcase find Abnormat OccurtencE Rep &tts 75-31 and 75-32 for Nine Ilite Poin.t Nuclear Plant Unit., #1.
The.se reports:are submi.ited in accordance with Regulatory Guide 1.16 and constitute fhtfittment of the fifteen (15) day lettet requirements. The Licensee Event Reports forms Q be submitted by the 10th of December,1975.
Very truly yours,
.h ML f'
" R.R.-Schneid w Vice President ' ';
Electric Operations i
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