United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated with Events > Event Notification Reports > 2007 > October 19

Event Notification Report for October 19, 2007

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
10/18/2007 - 10/19/2007

** EVENT NUMBERS **


43724 43729

To top of page
General Information or Other Event Number: 43724
Rep Org: MA RADIATION CONTROL PROGRAM
Licensee: ALLEGHENY RODNEY
Region: 1
City: NEW BEDFORD State: MA
County:
License #: G-0112
Agreement: Y
Docket:
NRC Notified By: BRUCE PACKARD
HQ OPS Officer: PETE SNYDER
Notification Date: 10/15/2007
Notification Time: 18:29 [ET]
Event Date: 10/15/2007
Event Time: 12:00 [EDT]
Last Update Date: 10/15/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
AGREEMENT STATE
Person (Organization):
RONALD BELLAMY (R1)
SCOTT FLANDERS (FSME)

Event Text

MASSACHUSETTS AGREEMENT STATE REPORT

The following agreement state report information was faxed to the NRC Operation Center.


"Description: Thickness gauge

"Investigation Pending: No

"Consultant Hired: Yes

"Corrective Action: Licensed Contractor fixed the gauge


"SUBJECT: A gauge on the Z-25 press is sometimes stuck closed. The equipment is out of use.


"Equipment problem : Shutter was not working properly. Equipment problem, capacitor fell off."

To top of page
Power Reactor Event Number: 43729
Facility: VERMONT YANKEE
Region: 1 State: VT
Unit: [1] [ ] [ ]
RX Type: [1] GE-4
NRC Notified By: ANDREW WISNIEWSKI
HQ OPS Officer: JOE O'HARA
Notification Date: 10/18/2007
Notification Time: 12:36 [ET]
Event Date: 09/15/2007
Event Time: [EDT]
Last Update Date: 10/18/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
Person (Organization):
RONALD BELLAMY (R1)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation

Event Text

INVALID PRIMARY CONTAINMENT ISOLATION

"This notification is being made in accordance with 10CFR50.73(a)(2)(iv)(A) to provide information pertaining to an invalid Primary Containment Isolation System (PCIS) Group 3 actuation signal that affected containment isolation valves in more than one system.

"On 09/15/07, with the reactor at 100% power, an invalid PCIS Group 3 actuation occurred from a momentary spike of the 'A' Refuel Floor radiation monitor which reached the instrument's high radiation trip setpoint. Radiation protection technicians dispatched to the refuel floor verified dose rates in the vicinity of the 'A' radiation monitors detector to be normal and below the alarm set points. The radiation monitor was verified to be indicating normally to expected radiation levels. Subsequent visual inspection and functional checks of the radiation monitor were completed satisfactory and the instrument channel was returned to service. The cause of the spurious spike is attributed to an unknown source of electrical noise.

"Both trains of the Standby Gas Treatment System started as designed and Reactor Building ventilation isolated. The train actuation was complete.

"The PCIS functioned successfully providing a complete Group 3 isolation. The PCIS Group 3 isolation involves the following systems and isolation valves:
Drywell and Suppression Chamber air purge and vent: V16-19-6, 6A, 6B, 7, 7A, 7B, 8, 9, 10, 23
Containment Makeup: V16-20-20, 22A, 22B
Containment Air Sampling: VG-23, 26, V109-76A, 76B
Containment Air compressor suction: V72-38A, 38B
Containment Air Dilution: VG-9A, 9B, 22A, 22B, NG-11A, 11B, 12A, 12B, 13A, 13B

"In accordance with 10CFR50.73(a)(i) a telephone notification is being made instead of submitting a written Licensee Event Report."

The licensee will notify the NRC Resident Inspector.

Page Last Reviewed/Updated Thursday, March 29, 2012
Thursday, March 29, 2012