UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
OFFICE OF FEDERAL AND STATE MATERIALS
AND ENVIRONMENTAL MANAGEMENT PROGRAMS
OFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS
WASHINGTON, D.C. 20555-0001 February 28, 2007 NRC INFORMATION NOTICE 2007-08: POTENTIAL VULNERABILITIES OF TIME-
RELIANT COMPUTER-BASED SYSTEMS DUE
TO CHANGE IN DAYLIGHT SAVING TIME
DATES
ADDRESSEES
All U. S. Nuclear Regulatory Commission (NRC) licensees and all Agreement State Radiation
Control Program Directors and State Liaison Officers.
PURPOSE
The NRC is issuing this information notice (IN) to inform addressees of the potential
vulnerabilities of computer-based systems and devices due to the change in the start and end
dates of Daylight Savings Time (DST) in 2007. This change could potentially cause problems
for computer-based systems and devices that employ time-dependent processes that have not
been set to synchronize with the 2007 DST change. This IN is issued to ensure that all
recipients are aware of the start and end date changes to DST and the potential for problems
this change could cause.
It is expected that recipients will review the information for applicability to their facilities and
consider actions, as appropriate, to avoid any problems. However, suggestions contained in
this information notice are not NRC requirements; therefore, no specific action or written
response is required.
DESCRIPTION OF CIRCUMSTANCES
The Energy Policy Act of 2005 included a change in start and end dates of DST beginning in
2007. This year, DST will be extended by a month starting about three weeks sooner, and
ending a week later than usual. Specifically, DST will begin on March 11, 2007, and end on
November 4, 2007, therefore, clocks will be set ahead 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> on March 11, 2007, and will be
set back 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> on November 4, 2007.
DISCUSSION
There are many computer-based systems that may be vulnerable to the 2007 DST changes.
Examples include software to perform system control, data logging, and time-related
calculations. The DST changes may also have impacts on other time-dependent computer
systems, such as corporate and local Information Technology systems, communication
systems, and security systems.
CONTACT
This IN requires no specific action or written response. If you have any questions about the
information in this notice, please contact the technical contact below, or the appropriate
regional office.
/RA/ /RA by TQuay for/
Janet R. Schlueter Michael J. Case, Director
Division of Materials Safety Division of Policy and Rulemaking
and State Agreements Office of Nuclear Reactor Regulation
Office of Federal and State Materials and
Environmental Management Programs
Technical Contact:
Matthew Chiramal, NRR/DE
(301) 415-2845 E-mail: mxc@nrc.gov
Note: NRC generic communications may be found on the NRC public web site, http://www.nrc.gov under Electronic Reading Room/Document Collections.
DISCUSSION
There are many computer-based systems that may be vulnerable to the 2007 DST changes.
Examples include software to perform system control, data logging, and time-related
calculations. The DST changes may also have impacts on other time-dependent computer
systems, such as corporate and local Information Technology systems, communication
systems, and security systems.
CONTACT
This IN requires no specific action or written response. If you have any questions about the
information in this notice, please contact the technical contact below, or the appropriate
regional office.
/RA/ /RA by TQuay for/
Janet R. Schlueter Michael J. Case, Director
Division of Materials Safety Division of Policy and Rulemaking
and State Agreements Office of Nuclear Reactor Regulation
Office of Federal and State Materials and
Environmental Management Programs
Technical Contact:
Matthew Chiramal, NRR/DE
(301) 415-2845 E-mail: mxc@nrc.gov
Note: NRC generic communications may be found on the NRC public web site, http://www.nrc.gov under Electronic Reading Room/Document Collections.
ADAMS Accession Number: ML070510034 OFFICE DE PGCB:DPR PGCB:DPR D:DE BC:PGCB:DPR D:DPR
NAME MChiramal JRobinson CHawes PHiland CJackson MJCase
DATE 02/20/07 02/21/07 02/28/07 02/20/07 02/28/07 02/28/07 OFFICE Tech.Editor FSME FSME FSME NMSS NMSS
NAME CClark (email) AMcintosh PRathbun JSchlueter RPierson EBrach (email)
DATE 02/22/07 02/21/07 02/23/07 02/27/07 02/21/07 02/26/07 OFFICE NMSS
NAME LKokajko
DATE 02/22/07 OFFICIAL RECORD COPY
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list | - Information Notice 2007-03, Reportable Medical Events Involving Patients Receiving Dosages of Sodium Iodide Iodine-131 Less than the Prescribed Dosage Because of Capsules Remaining in Vials After Administration (2 February 2007, Topic: Enforcement Discretion)
- Information Notice 2007-03, Reportable Medical Events Involving Patients Receiving Dosages of Sodium Iodide Iodine-131 Less Than the Prescribed Dosage Because of Capsules Remaining in Vials After Administration (2 February 2007, Topic: Tritium Exit Sign)
- Information Notice 2007-04, Construction Experience Related to the Assurance of Quality in the Construction of Nuclear Power Plants (5 February 2007)
- Information Notice 2007-05, Vertical Deep Draft Pump Shaft and Coupling Failures (9 February 2007, Topic: Ultimate heat sink)
- Information Notice 2007-06, Potential Common Cause Vulnerabilities in Essential Service Water Systems (9 February 2007, Topic: Ultimate heat sink, Probabilistic Risk Assessment, Coatings, Biofouling, Through-Wall Leak)
- Information Notice 2007-07, Potential Failure of All Control Rod Groups to Insert in a Boiling Water Reactor (BWR) Due to a Fire (15 February 2007, Topic: Hot Short, Safe Shutdown, Shutdown Margin, Fire Protection Program, Backfit)
- Information Notice 2007-08, Potential Vulnerabilities of Time-Reliant Computer-Based Systems Due to Change in Daylight Saving Time Dates (28 February 2007)
- Information Notice 2007-09, Equipment Operability Under Degraded Voltage Conditions (26 March 2007)
- Information Notice 2007-10, Yttritium-90 TheraSpheres and SirSpheres Impurities (2 March 2007, 15 March 2007, Topic: Tritium Exit Sign, TheraSphere)
- Information Notice 2007-10, Yttritium-90 Theraspheres and Sirspheres Impurities (2 March 2007, Topic: Enforcement Discretion, TheraSphere)
- Information Notice 2007-11, Recent Operator Performance Issues at Nuclear Power Plants (6 March 2007, Topic: Time of Discovery)
- Information Notice 2007-12, Tactical Communications Interoperability Between Nuclear Power Reactor Licensees and First Responders (15 March 2007)
- Information Notice 2007-14, Loss of Offsite Power and Dual-Unit Trip at Catawba Nuclear Generating Station (30 March 2007)
- Information Notice 2007-15, Effects of Ethernet-based, Non-Safety Related Controls on the Safe and Continued Operation of Nuclear Power Stations (17 April 2007)
- Information Notice 2007-17, Fires at Nuclear Power Plants Involving Inadequate Fire Protection Administrative and Design Controls (3 May 2007, Topic: Safe Shutdown, Fire Barrier, Operator Manual Action, Continuous fire watch, Fire Protection Program, Fire Watch, Hourly Fire Watch)
- Information Notice 2007-18, Operating Experience Regarding Entrainment of Gas or Debris Into Auxiliary Feedwater Systems (13 May 2007, Topic: Design basis earthquake)
- Information Notice 2007-18, Operating Experience Regarding Entrainment of Gas or Debris into Auxiliary Feedwater Systems (13 May 2007, Topic: Foreign Material Exclusion)
- Information Notice 2007-20, Use of Blank Ammunition (11 June 2007)
- Information Notice 2007-21, Pipe Wear Due to Interaction of Flow-Induced Vibration and Reflective Metal Insulation (11 December 2020, Topic: VT-2, Liquid penetrant)
- Information Notice 2007-22, Recent Hydrogen Fluoride Exposures at Fuel Cycle Facilities (19 June 2007, Topic: Uranium Hexafluoride, TheraSphere)
- Information Notice 2007-23, Inadvertent Discharge of Halon 1301 Fire Suppression System Due to Incorrect and/or Out of Date Procedures (8 August 2007, Topic: Fire Protection Program)
- Information Notice 2007-23, Inadvertent Discharge of Halon 1301 Fire Suppression System Due to Incorrect And/Or Out of Date Procedures (8 August 2007, Topic: Fire Protection Program, TheraSphere)
- Information Notice 2007-24, Summary of Fitness-for-Duty Program Performance Reports for Calendar Year 2006 (19 July 2007, Topic: Fitness for Duty, Contraband)
- Information Notice 2007-25, Recommendations From the Advisory Committee on the Medical Use of Isotopes for Improved Compliance with 10 CFR 35.40 and 35.27 (19 July 2007, Topic: Tritium Exit Sign)
- Information Notice 2007-25, Recommendations from the Advisory Committee on the Medical Use of Isotopes for Improved Compliance with 10 CFR 35.40 and 35.27 (19 July 2007, Topic: Enforcement Discretion)
- Information Notice 2007-26, E-mail from Alex Klein to Alex Marion Regarding NRC Information Notice 2007-26 (17 December 2007, Topic: Coatings)
- Information Notice 2007-27, Recurring Events and Trends Involving Emergency Diesel Generator Operability (6 August 2007, Topic: Preliminary White Finding)
- Information Notice 2007-28, Potential Common Cause Vulnerabilities in Essential Service Water Systems Due to Inadequate Chemistry Controls (19 September 2007, Topic: Probabilistic Risk Assessment, Frazil ice, Biofouling)
- Information Notice 2007-29, Temporary Scaffolding Affects Operability of Safety-Related Equipment (17 September 2007, Topic: High Energy Line Break, Fire Protection Program, Scaffolding)
- Information Notice 2007-30, Radiological Controls Create Criticality Safety Accident Scenario for Fissile Solution Container Transport at Fuel Cycle Facility (13 September 2007, Topic: Coatings, TheraSphere)
- Information Notice 2007-31, U.S. Food and Drug Administration Announcement Related to Sleep Disorder Drugs (13 November 2007, Topic: Fitness for Duty, Coatings, TheraSphere)
- Information Notice 2007-32, Out of Service Equipment Connected to in Service Process Line Results in Fissile Solution Spill at Fuel Cycle Facility (15 October 2007, Topic: Hydrostatic, Coatings, TheraSphere)
- Information Notice 2007-32, Out of Service Equipment Connected To In Service Process Line Results in Fissile Solution Spill at Fuel Cycle Facility (15 October 2007, Topic: Hydrostatic, Coatings, TheraSphere)
- Information Notice 2007-34, Operating Experience Regarding Electrical Circuit Breakers (22 October 2007)
- Information Notice 2007-36, Emergency Diesel Generator Voltage Regulator Problems (15 November 2007)
- Information Notice 2007-37, Buildup of Deposits in Steam Generators (23 November 2007)
- Information Notice 2007-38, Ensuring Complete and Accurate Information in the Documentation of Training and Experience for Individuals Seeking Medical Authorization Under the Alternate Pathway (14 December 2007, Topic: TheraSphere)
- Information Notice 2007-40, Inadequate Implementation of 10 CFR Part 21 Requirements by Vendors Who Supply Basic Components to Nuclear Power Plant Licensees (21 December 2007)
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