Category:NRC Information Notice[Table view]The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Mcguire]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Crane]] </code>.
All holders of operating licenses or construction permits for nuclear power
reactors.
Purpose
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice
to alert addressees regarding the possible improper installation of instrumen- tation modules that could result in inadequate seismic qualification of instru- ment cabinets. It is expected that recipients will review the information for
applicability to their facilities and consider actions, as appropriate, to
avoid similar problems. However, suggestions contained in this information
notice are not NRC requirements; therefore, no specific action or written
response is required.
Description of Circumstances
By letter of August 29, 1991, Entergy Operations, Inc., the licensee for the
Arkansas Nuclear One facility, notified the NRC that it had identified that
certain instrument modules located in the safety-related Foxboro instrument
cabinets did not have vibration-dampening material installed. The licensee
also noted that the instrument module guide rails were not installed for some
of the modules and that some of the power supply brackets were missing.
Through an engineering evaluation and contact with the vendor, the licensee
determined that the cabinets and the instrumentation modules were not seismi- cally qualified in the condition in which they were found. This finding
prompted the licensee to declare the affected cabinets inoperable.
The
licensee took immediate action to place the plant in a Hot Shutdown condition
in accordance with the technical specification requirements.
Discussion
The licensee reviewed the events leading up to the discovery of the improper
installation of the instrumentation modules and found that it had purchased the
Foxboro Specification 200 instrument nests and modules in 1984 as separate
parts and arranged for their assembly at the site by the licensee's general
contractor.
In addition, another contractor assembled similar equipment
offsite and then shipped it to the site for installation. It was noted that
the vendor had shipped the subject vibration-dampening material, guide rails, and power supply brackets with the equipment.
However, the shipping package
did not include a parts list or any specific installation instructions for
While the licensee did procure the applicable vendor
manuals, the manuals applied to the general line of Specification 200 equipment
and did not address the special instructions for Class IE equipment since at
that time Foxboro had not as yet developed the pertinent instructions. Also, the vendor's documentation did not include detailed installation drawings. A
paragraph in the Class IE qualification test results indicated that the stan- dard modules would need to be modified to meet seismic qualifications.
However, the test report did not provide specific instructions for such a
modification, and the licensee's review was not adequate to identify the need.
In addition, the contractor personnel did not inquire regarding the purpose of
the additional parts included in the shipping package.
This information notice requires no specific action or written response.: If
you have any questions about the information in this notice, please contact the
technical contact listed below or the appropriate Office of Nuclear Reactor
November 4, 1991 these components. While the licensee did procure the applicable vendor
manuals, the manuals applied to the general line of Specification 200 equipment
and did not address the special instructions for Class IE equipment since at
that time Foxboro had not as yet developed the pertinent instructions. Also, the vendor's documentation did not include detailed installation drawings. A
paragraph in the Class IE qualification test results indicated that the stan- dard modules would need to be modified to meet seismic qualifications.
However, the test report did not provide specific instructions for such a
modification, and the licensee's review was not adequate to identify the need.
In addition, the contractor personnel did not inquire regarding the purpose of
the additional parts included in the shipping package.
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact the
technical contact listed below or the appropriate Office of Nuclear Reactor
