ML20209D029
ML20209D029 | |
Person / Time | |
---|---|
Site: | Nine Mile Point ![]() |
Issue date: | 07/02/1999 |
From: | Conway J NIAGARA MOHAWK POWER CORP. |
To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
References | |
NMP1L-1447, NUDOCS 9907130012 | |
Download: ML20209D029 (2) | |
Text
NiagarahMohawk'
~
John T. Conway Phone: 315.349.4213 Vice President Fax: 315.349.2605 Nuclear Generation July 2,199)
NMPIL 1447 1
U, S. Nuclear Regulatory Commission
. Attn: Document Control Desk Washington, DC 20555 RE:
Nine Mile Point Unit 1 j
Docket No. 50-220 l
Subject:
Special Report Gentlemen:
In accordance with Nine Mile Point Unit 1 (NMPI) Technical Specification Table 3.6.11-1,
" Accident Monitoring Instrumentation," Action Statement 4.a., Niagara Mohawk Power Corporation (NMPC) is submitting the following Special Report concerning the inoperability of the #11 Containment Hydrogen Monitoring System (HMS).
Description of Event On June 21,1999, at 0441 hours0.0051 days <br />0.123 hours <br />7.291667e-4 weeks <br />1.678005e-4 months <br />, with the reactor mode switch in the "RUN" position during normal operations, NMP1 Operators identified that the #11 HMS chart recorder was indicating below normal operatir.g range. Operators investigaMand found that the sample pump appeared to be operating improperly, and at 05% hours on June 21,1999, declared the #11 HMS inoperable. The #11 HMS remains out of service for troubleshooting.
The #12 HMS was placed in service during :nnrtup from Refueling Outage 15, and remains in D
service.
nmcr of Event v
The cause of the event is unknown and troubleshooting is on-going.
h,b 9907130012 990702 PDR ADOCK 05000220 S
PDR 120054 Nine Mile Point Nuclear Station R0. Box 63. Lycorning, New York 13093 0063
- www.nimo com j
F Page 2 l
{
Cornedu Actions NMPC is currently troubleshooting the #11 HMS. The work is scheduled to be completed by July 9,1999.
NMPC will submit a supplement to this report when the #11 HMS has been returned to service and the cause of the event has been determined.
Very truly youts, I.
ohn T. Conway Vice President Nu r Generation -
JTC/KLUmlh xc:
Regional Administrator, Region I Mr. Gordon K. Hunegs, Senior Resident Inspector Records Management a - - -
..