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Category:NRC Information Notice
MONTHYEARInformation Notice 2011-15, Steel Containment Degradation and Associated License Renewal Aging Management Issues2011-08-0101 August 2011 Steel Containment Degradation and Associated License Renewal Aging Management Issues Information Notice 2006-13, Ground-Water Contamination Due To Undetected Leakage of Radioactive Water2006-07-10010 July 2006 Ground-Water Contamination Due To Undetected Leakage of Radioactive Water Information Notice 1999-28, Recall of Star Brand Fire Protection Sprinkler Heads1999-09-30030 September 1999 Recall of Star Brand Fire Protection Sprinkler Heads Information Notice 1999-27, Malfunction of Source Retraction Mechanism in Cobalt-60 Teletherapy Treatment Units1999-09-0202 September 1999 Malfunction of Source Retraction Mechanism in Cobalt-60 Teletherapy Treatment Units Information Notice 1999-26, Safety and Economic Consequences of Misleading Marketing Information1999-08-24024 August 1999 Safety and Economic Consequences of Misleading Marketing Information Information Notice 1999-25, Year 2000 Contingency Planning Activities1999-08-10010 August 1999 Year 2000 Contingency Planning Activities Information Notice 1999-24, Broad-Scope Licensees' Responsibilities for Reviewing and Approving Unregistered Sealed Sources and Devices1999-07-12012 July 1999 Broad-Scope Licensees' Responsibilities for Reviewing and Approving Unregistered Sealed Sources and Devices Information Notice 1999-23, Safety Concerns Related to Repeated Control Unit Failures of the Nucletron Classic Model High-Dose-Rate Remote Afterloading Brachytherapy Devices1999-07-0606 July 1999 Safety Concerns Related to Repeated Control Unit Failures of the Nucletron Classic Model High-Dose-Rate Remote Afterloading Brachytherapy Devices Information Notice 1999-20, Contingency Planning for the Year 2000 Computer Problem1999-06-25025 June 1999 Contingency Planning for the Year 2000 Computer Problem Information Notice 1999-21, Recent Plant Events Caused by Human Performance Errors1999-06-25025 June 1999 Recent Plant Events Caused by Human Performance Errors Information Notice 1999-22, 10CFR 34.43(a)(1); Effective Date for Radiographer Certification and Plans for Enforcement Discretion1999-06-25025 June 1999 10CFR 34.43(a)(1); Effective Date for Radiographer Certification and Plans for Enforcement Discretion Information Notice 1999-19, Rupture of the Shell Side of a Feedwater Heater at the Point Beach Nuclear Plant1999-06-23023 June 1999 Rupture of the Shell Side of a Feedwater Heater at the Point Beach Nuclear Plant Information Notice 1999-18, Update on Nrc'S Year 2000 Activities for Material Licensees and Fuel Cycle Licensees and Certificate Holders1999-06-14014 June 1999 Update on Nrc'S Year 2000 Activities for Material Licensees and Fuel Cycle Licensees and Certificate Holders Information Notice 1999-17, Problems Associated with Post-Fire Safe-Shutdown Circuit Analyses1999-06-0303 June 1999 Problems Associated with Post-Fire Safe-Shutdown Circuit Analyses Information Notice 1999-16, Federal Bureau of Investigation'S Nuclear Site Security Program1999-05-28028 May 1999 Federal Bureau of Investigation'S Nuclear Site Security Program Information Notice 1999-15, Misapplication for 10CFR Part 71 Transportation Shipping Cask Licensing Basis to 10CFR Part 50 Design Basis1999-05-27027 May 1999 Misapplication for 10CFR Part 71 Transportation Shipping Cask Licensing Basis to 10CFR Part 50 Design Basis Information Notice 1999-14, Unanticipated Reactor Water Draindown at Quad Cities Unit 2, Arkansas Nuclear One Unit 2, & FitzPatrick1999-05-0505 May 1999 Unanticipated Reactor Water Draindown at Quad Cities Unit 2, Arkansas Nuclear One Unit 2, & FitzPatrick Information Notice 1999-13, Insights from NRC Inspections of Low-and Medium-Voltage Circuit Breaker Maintenance Programs1999-04-29029 April 1999 Insights from NRC Inspections of Low-and Medium-Voltage Circuit Breaker Maintenance Programs Information Notice 1999-12, Year 2000 Computer Systems Readiness Audits1999-04-28028 April 1999 Year 2000 Computer Systems Readiness Audits Information Notice 1999-11, Incidents Involving the Use of Radioactive Iodine-1311999-04-16016 April 1999 Incidents Involving the Use of Radioactive Iodine-131 Information Notice 1999-08, Urine Specimen Adulteration1999-03-26026 March 1999 Urine Specimen Adulteration Information Notice 1999-09, Problems Encountered When Manually Editing Treatment Data on the Nucletron Microselectron-HDR (New) Model 105-9991999-03-24024 March 1999 Problems Encountered When Manually Editing Treatment Data on the Nucletron Microselectron-HDR (New) Model 105-999 Information Notice 1999-07, Failed Fire Protection Deluge Valves & Potential Testing Deficiencies in Preaction Sprinkler Systems1999-03-22022 March 1999 Failed Fire Protection Deluge Valves & Potential Testing Deficiencies in Preaction Sprinkler Systems Information Notice 1999-06, 1998 Enforcement Sanctions as a Result of Deliberate Violations of NRC Employee Protection Requirements1999-03-19019 March 1999 1998 Enforcement Sanctions as a Result of Deliberate Violations of NRC Employee Protection Requirements Information Notice 1999-06, 1998 Enforcement Sanctions As a Result of Deliberate Violations of NRC Employee Protection Requirements1999-03-19019 March 1999 1998 Enforcement Sanctions As a Result of Deliberate Violations of NRC Employee Protection Requirements Information Notice 1999-05, Inadvertent Discharge of Carbon Dioxide Fire Protection System and Gas Migration1999-03-0808 March 1999 Inadvertent Discharge of Carbon Dioxide Fire Protection System and Gas Migration Information Notice 1999-04, Unplanned Radiation Exposures to Radiographers, Resulting from Failures to Follow Proper Radiation Safety Procedures1999-03-0101 March 1999 Unplanned Radiation Exposures to Radiographers, Resulting from Failures to Follow Proper Radiation Safety Procedures Information Notice 1999-03, Exothermic Reactors Involving Dried Uranium Oxide Powder (Yellowcake)1999-01-29029 January 1999 Exothermic Reactors Involving Dried Uranium Oxide Powder (Yellowcake) Information Notice 1999-02, Guidance to Users on the Implementation of a New Single-Source Dose-Calculation Formalism and Revised Air-Kerma Strength Standard for Iodine-125 Sealed Sources1999-01-21021 January 1999 Guidance to Users on the Implementation of a New Single-Source Dose-Calculation Formalism and Revised Air-Kerma Strength Standard for Iodine-125 Sealed Sources Information Notice 1999-01, Deterioration of High-Efficiency Particulate Air Filters in a Pressurized Water Reactor Containment Fan Cooler Unit1999-01-20020 January 1999 Deterioration of High-Efficiency Particulate Air Filters in a Pressurized Water Reactor Containment Fan Cooler Unit Information Notice 1998-45, Cavitation Erosion of Letdown Line Orifices Resulting in Fatigue Cracking of Pipe Welds1998-12-15015 December 1998 Cavitation Erosion of Letdown Line Orifices Resulting in Fatigue Cracking of Pipe Welds Information Notice 1998-44, Ten-Year Inservice Inspection (ISI) Program Update for Licensees That Intend to Implement Risk-Informed ISI of Piping1998-12-10010 December 1998 Ten-Year Inservice Inspection (ISI) Program Update for Licensees That Intend to Implement Risk-Informed ISI of Piping Information Notice 1998-43, Leaks in Emergency Diesel Generator Lubricating Oil & Jacket Cooling Water Piping1998-12-0404 December 1998 Leaks in Emergency Diesel Generator Lubricating Oil & Jacket Cooling Water Piping Information Notice 1998-42, Implementation of 10 CFR 55.55a(g) Inservice Inspection Requirements1998-12-0101 December 1998 Implementation of 10 CFR 55.55a(g) Inservice Inspection Requirements Information Notice 1998-41, Spurious Shutdown of Emergency Diesel Generators from Design Oversight1998-11-20020 November 1998 Spurious Shutdown of Emergency Diesel Generators from Design Oversight Information Notice 1998-41, Spurious Shutdown of Emergency Diesel Generators From Design Oversight1998-11-20020 November 1998 Spurious Shutdown of Emergency Diesel Generators From Design Oversight Information Notice 1998-39, Summary of Fitness-for-Duty Program Performance Reports for Calendar Years 1996 and 19971998-10-30030 October 1998 Summary of Fitness-for-Duty Program Performance Reports for Calendar Years 1996 and 1997 Information Notice 1998-40, Design Deficiencies Can Lead to Reduced ECCS Pump Net Positive Suction Head During Design-Basis Accidents1998-10-26026 October 1998 Design Deficiencies Can Lead to Reduced ECCS Pump Net Positive Suction Head During Design-Basis Accidents Information Notice 1990-66, Incomplete Draining and Drying of Shipping Casks1998-10-25025 October 1998 Incomplete Draining and Drying of Shipping Casks Information Notice 1998-38, Metal-Clad Circuit Breaker Maintenance Issues Identified by NRC Inspections1998-10-15015 October 1998 Metal-Clad Circuit Breaker Maintenance Issues Identified by NRC Inspections Information Notice 1998-37, Eligibility of Operator License Applicants1998-10-0101 October 1998 Eligibility of Operator License Applicants Information Notice 1998-36, Inadequate or Poorly Controlled, Non-Safety-Related Maintenance Activities Unnecessarily Challenged Safety Systems1998-09-18018 September 1998 Inadequate or Poorly Controlled, Non-Safety-Related Maintenance Activities Unnecessarily Challenged Safety Systems Information Notice 1998-33, NRC Regulations Prohibit Agreements That Restrict or Discourage an Employee from Participating in Protected Activities1998-08-28028 August 1998 NRC Regulations Prohibit Agreements That Restrict or Discourage an Employee from Participating in Protected Activities Information Notice 1998-34, Configuration Control Errors1998-08-28028 August 1998 Configuration Control Errors Information Notice 1998-31, Fire Protection System Design Deficiencies and Common-Mode Flooding of Emergency Core Cooling System Rooms at Washington Nuclear Project Unit 21998-08-18018 August 1998 Fire Protection System Design Deficiencies and Common-Mode Flooding of Emergency Core Cooling System Rooms at Washington Nuclear Project Unit 2 Information Notice 1998-30, Effect of Year 2000 Computer Problem on NRC Licensees and Certificate Holders1998-08-12012 August 1998 Effect of Year 2000 Computer Problem on NRC Licensees and Certificate Holders Information Notice 1998-29, Predicted Increase in Fuel Rod Cladding Oxidation1998-08-0303 August 1998 Predicted Increase in Fuel Rod Cladding Oxidation Information Notice 1998-28, Development of Systematic Sample Plan for Operator Licensing Examinations1998-07-31031 July 1998 Development of Systematic Sample Plan for Operator Licensing Examinations Information Notice 1998-26, Settlement Monitoring and Inspection of Plant Structures Affected by Degradation of Porous Concrete Subfoundations1998-07-24024 July 1998 Settlement Monitoring and Inspection of Plant Structures Affected by Degradation of Porous Concrete Subfoundations Information Notice 1998-27, Steam Generator Tube End Cracking1998-07-24024 July 1998 Steam Generator Tube End Cracking 2011-08-01
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SSINS NO.: 6835 Accession No.
8008220279 IN 80-43 UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF INSPECTION AND ENFORCEMENT
WASHINGTON, D.C. 20555 December 5, 1980
IE Information Notice No. 80-43: FAILURES OF THE CONTINUOUS WATER LEVEL
MONITOR FOR THE SCRAM DISCHARGE VOLUME
AT DRESDEN UNIT NO. 2 Descriotion of Circumstances:
On December 2, 1980, following a reactor scram at Dresden Nuclear Power
Station Unit 2, the licensee discovered that the recently installed scram
discharge volume (SDV) continuous water level monitoring system had failed
to respond as expected. The continuous water level monitoring system was
designed and supplied by Nortec Corporation, and utilizes a single transmit/
receive transducer for each of the four level monitoring channels. Following
installation of the continuous level monitoring system, the licensee verified
its operability by tripping each alarm channel while its sensor was connected
to a calibration standard consisting of a section of 4 inch pipe identical to
the SDV piping. No in situ test of the equipment was accomplished.
The expected high level annunciator alarms were not received in the control
room following scram when the SDV filled with water. An investigation
to determine the cause was initiated and once per shift checks of the
SDV level on both Units 2 and 3 were re-instituted. The reactor scram
system functioned normally and post scram manual ultrasonic tests on the
SDV verified proper system drain.
Investigations by the licensee determined that the ultrasonic detectors
were inadequately coupled to the SDV piping. The coupling was improved
and testing performed to show that the system could detect water flow
into the SDV during single control rod scram tests. The unit was taken
critical and was heating up on December 4, 1980, at approximately 400
psig when a reactor scram occurred. The expected SDV high level annunciator
alarms were not received in the control room immediately following the
scram, but were received about 10-15 minutes later when the SDV was draining.
Following an additional scram at approximately 20 psig with control rods
inserted these alarms were received properly. Investigation identified
level detection system operability problems as evidenced by a low signal
to noise ratio. Arrannements are being made for replacement components
(including transducers to improve the signal characteristics and reduce
system noise. Until the improvements are installed and demonstrated
adequate by in situ testing, use of the ultrasonic detection system is
being augmented with manual ultrasonic checks of level in the SDV, using
the previously required once per shift check. A manual check will be
performed after each reactor scram. At Dresden Unit 2 the licensee will
IN 80-43 December 5, 1980 complete the system improvements and required testing within 7 days in
accordance with the Immediate Action Letter issued by Region III on
December 4, 1980.
The above operating experience indicates the need for a demonstration
of the operability of ultransonic systems recently installed to continuously
monitor for water in the SDV. Until demonstrated operable by in situ
testing, these systems should not be solely relied on for detection of
water in the SDV. Use of new ultrasonic detection systems should be
augmented by manual checks for water in the SDV each shift and after
reactor scram until in situ testing is performed.
It is important that a high degree of reliability be established in
operability of these continuous water level monitoring systems in order
to support plant operations in the interim until final scram discharge
system modifications are performed.
This IE Information Notice is provided as an early notification of a
possibly significant matter that is still under review bv the NRC staff.
Recipients should review the information for possible applicability
to their facilities. No specific response is requested at this time.
Pending further NRC evaluations, we expect licensee actions will be
requested or required.
No written response to this IE Information Notice is required. If you have
any questions regarding this matter, please contact the Director of the
appropriate NRC Regional Office.
IN 80-43 December 5, 1980
RECENTLY ISSUED
IE INFORMATION NOTICES
Information Date of
Notice No. Subject Issue Issued to
80-42 Effect of Radiation on 11/24/80 All power reactor
Hydraulic Snubber Fluid facilities with OL
or CP
80-41 Failure of Swing Check 11/10/80 All power reactor
Valve in the Decay Heat facilities with an OL
Removal System at Davis- or CP
Besse Unit No. 1
80-40 Excessive Nitrogen Supply 11/10/30 All nuclear power
Pressure Actuates Safety- facilities with
Relief Valve Operation to OL or CP
Cause Reactor Depressur- ization
80-39 Malfunctions Of Solenoid 10/31/80 All light water reactor
Valves Manufactured By facilities holding
Valcor Engineering Corporation power reactor OLs or CPs
80-38 Cracking In Charging Pump 10/30/80 All PWR facilities
Casing Cladding with an OL or CP
80-37 Containment cooler leaks 10/24/80 All nuclear power
and reactor cavity facilities holding
flooding at Indian Point power reactor OLs
Unit 2 or CPs
80-36 Failure of Steam 10/10/80 All nuclear power
Generator Support Bolting reactor facilities
holding power reactor
OLs or CPs
80-35 Leaking and dislodged 10/10/80 All categories G and
Iodine-124 implant seeds G1 medical licensees
80-34 Boron dilution of reactor 9/26/80 All pressurized water
coolant during steam reactor facilities
generator decontamination holding power reactor OLs
80-33 Determination of teletherapy 9/15/80 All teletherapy
timer accuracy (G3) licensees
- Operating Licenses or Construction Permits
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list | - Information Notice 1980-03, Main Turbine Electrohydraulic Control System (31 January 1980)
- Information Notice 1980-05, Chloride Contamination of Safety Related Piping & Components (8 February 1980)
- Information Notice 1980-06, Notification of Significant Events at Operating Power Reactor Facilities (29 July 1980, Topic: Earthquake, Fatality)
- Information Notice 1980-07, Pump Shaft Fatigue Cracking (29 February 1980)
- Information Notice 1980-08, the States Company Sliding Link Electrical Terminal Block (7 March 1980)
- Information Notice 1980-08, The States Company Sliding Link Electrical Terminal Block (7 March 1980)
- Information Notice 1980-09, Possible Occupational Health Hazard Associated with Closed Cooling Systems for Operating Power Plants (7 March 1980)
- Information Notice 1980-10, Partial Loss of Non-Nuclear Instrument System Power Supply During Operation (7 March 1980)
- Information Notice 1980-11, Generic Problems with Asco Valves in Nuclear Applications Including Fire Protection Systems (14 March 1980)
- Information Notice 1980-12, Instrument Failure Causes Opening of Porv & Block Valve (31 March 1980)
- Information Notice 1980-13, General Electric Type Sbm Control Switches Defective CAM Followers (2 April 1980)
- Information Notice 1980-14, Safety Suggestions from Employees (2 April 1980)
- Information Notice 1980-15, Axial (Longitudinal) Oriented Cracking in Piping (21 April 1980, Topic: Liquid penetrant)
- Information Notice 1980-15, Axial (longitudinal) Oriented Cracking in Piping (21 April 1980, Topic: Liquid penetrant)
- Information Notice 1980-16, Shaft Seal Packing Causes Binding in Main Steam Swing Disc Check & Isolation Valves (29 April 1980)
- Information Notice 1980-19, Niosh Recall of Recirculating-Mode (Closed Circuit) Self-Contained Breathing Apparatus (Rebreather) (6 May 1980)
- Information Notice 1980-19, Niosh Recall of Recirculating-Mode (closed Circuit) Self-Contained Breathing Apparatus (rebreather) (6 May 1980)
- Information Notice 1980-20, Loss of Decay Heat Removal Capability at Davis-Besse Unit 1 While in a Refueling Mode (8 May 1980)
- Information Notice 1980-21, Anchorage & Support of Safety-Related Electrical Equipment (16 May 1980, Topic: Earthquake)
- Information Notice 1980-22, Breakdowns in Contamination Control Programs (28 May 1980)
- Information Notice 1980-25, Transportation of Pyrophoric Uranium (30 May 1980)
- Information Notice 1980-26, Evaluation of Contractor QA Programs (10 June 1980)
- Information Notice 1980-27, Degradation of Reactor Coolant Pump Studs (11 June 1980, Topic: Boric Acid)
- Information Notice 1980-29, Broken Studs on Terry Turbine Steam Inlet Flange (7 August 1980)
- Information Notice 1980-31, Maloperation of Gould-Brown Boveri 480 Volt-Type K-6005 & K-Don 6005 Circuit Breakers (27 August 1980)
- Information Notice 1980-34, Boron Dilution of Reactor Coolant During Steam Generator Decontamination (26 September 1980, Topic: Boric Acid, Shutdown Margin)
- Information Notice 1980-37, Containment Cooler Leaks & Reactor Cavity Flooding at Indian Point Unit 2 (24 October 1980)
- Information Notice 1980-38, Cracking in Charging Pump Casing Cladding (30 October 1980, Topic: Boric Acid, Nondestructive Examination)
- Information Notice 1980-39, Malfunction of Solenoid Valves Manufactured by Valcor Engineering Corp (31 October 1980)
- Information Notice 1980-40, Excessive Nitrogen Supply Pressure Actuates Safety-Relief Valve Operation to Cause Reactor Depressurization (7 November 1980)
- Information Notice 1980-41, Failure of Swing Check Valve in Decay Heat Removal System at Davis Besse Unit No.1 (10 November 1980)
- Information Notice 1980-42, Effect of Radiation on Hydraulic Snubber Fluid (24 November 1980)
- Information Notice 1980-43, Failures of Continuous Water Level Monitor for Scram Discharge Volume at Dresden Unit No.2 (5 December 1980, Topic: Scram Discharge Volume)
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