Failed Fire Protection Deluge Valves & Potential Testing Deficiencies in Preaction Sprinkler SystemsML031040487 |
Person / Time |
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Site: |
Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant |
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Issue date: |
03/22/1999 |
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From: |
Matthews D Division of Regulatory Improvement Programs |
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To: |
|
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References |
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IN-99-007, NUDOCS 9903180104 |
Download: ML031040487 (7) |
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Similar Documents at Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant |
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Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination 2020-09-03 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 [[:Three Mile Island]] 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]] </code>.
[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 [[:Three Mile Island]] 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]] </code>. |
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555-0001 March 22, 1999 NRC INFORMATION NOTICE 99-07: FAILED FIRE PROTECTION DELUGE VALVES AND
POTENTIAL TESTING DEFICIENCIES IN PREACTION
SPRINKLER SYSTEMS
Addressees
All NRC licensees.
Purvose
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice (IN) to alert
addressees to test methodologies for fire protection deluge valves that may not adequately
demonstrate valve operability. 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.
Backaround
Valves for sprinkler system automatic control (SSAC) are used In fire protection systems that
protect areas housing both safety-related and non-safety-related equipment used for fire safe
shutdown (FSSD). Many of these systems are used to provide primary fire protection and to
meet the requirements of 10 CFR Part 50, Appendix R, Section III.G. Poor design, deficient
maintenance, or inadequate testing of SSAC valves and associated solenoid valves can lead to
a common-mode failure of the valves to perform their design function of providing adequate and
reliable fire protection. This, in turn, can result In fire damage to safe shutdown equipment in
the event of a fire.
The Model A-4 Multimatic Valve manufactured by Grinnell Is a deluge valve designed
specifically for use In fire protection systems. It Is used as a system control valve in deluge, preaction, and special types of fire protection systems and may also provide for actuation of fire
alarms when the systems operate.
Preaction valves contain connections for monitoring pressure In the diaphragm chamber and in
the main water supply, for providing valve drainage and for supplying water to the diaphragm
chamber. All required components for these connections are typically supplied by the valve
manufacturer as "trim packages' and are included as part of the Underwriters Laboratories, Inc., (UL) and Factory Mutual, Inc., (FM) certifications of the valves.
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IN 99-07 March 22, 1999
Description of Circumstances
In the week of March 4, 1996, during surveillance testing of preaction sprinkler systems in the
Farley Unit I fire protection system, 5 of 11 SSAC valves (Grinnell Model A4 deluge valves)
failed to trip open when water pressure was vented out of the diaphragm chamber. Upon
additional testing, the licensee found that several other SSAC valves failed. The licensee's
root-cause team, formed after the Initial valve failures, concluded that the diaphragm was
sticking to its retainer and push rod disk, that the push rod assembly showed wear (pits and
eroded plating), and that the associated solenoid valves were not properly bleeding water
pressure out of the diaphragm area.
The licensee's root-cause team found that plant personnel were using an abrasive cleaning pad
to clean the chrome-plated push rod and the push rod guide in the diaphragm retainers. The
team theorized that this activity may have created rust particles that caused the sticking. In like
manner, abrasives used to clean the solenoid valves could cause the plunger assembly to stick.
Grinnell does not recommend using any abrasives, lubricants, or solvents because they may
damage metallic surfaces such as valve seats, and may also damage elastomeric seals.
Grinnell recommends cleaning the push rods, guides, and solenoid valves with only soap, water, and clean cloths.
The root-cause team also found that the solenoid valves were designed for operating pressures
of approximately 150 psig (UL maximum rated pressure Is 175 psig), whereas the actual
operating pressures often exceeded 150 psig (the licensee determined that fire protection
system pressures sometimes went as high as 225 psig). The NRC staff theorizes that the
valves may not be able to open against this pressure.
Although the root-cause team did not conclusively determine the root cause of the valve
failures, the team recommended (1) replacing the diaphragms and solenoid valves, (2) Installing
new solenoid valves with a design pressure of 200 psi (and factory tested to 300 psi),
(3) flushing the solenoid valve piping and diaphragm chamber when cleaning the solenoids,
(4) requiring the use of only soap, water, and a clean cloth when cleaning the solenoid valves,
(5) cleaning the solenoid and SSAC valves more frequently, and (6) testing the valves more
often - every 12 months Instead of 18 months (in the short term, the licensee Increased testing
to every 2, 6, and 12 months after resetting the valves to improve reliability).
In subsequent walkdowns, the team found that the piping for the deluge valve control drain lines
had a 318-inch diameter In lieu of the %-Inch diameter line typically supplied by the
manufacturer as part of the trim package listed by the independent testing laboratory (i.e., UL
or FM). The use of the smaller drain line could potentially inhibit the bleedoff of water from the
diaphragm chamber, resulting In Increased pressure In the chamber. The staff notes that this
restriction, in turn, could prevent the valve from opening.
In mid-February 1998, the licensee performed a scheduled surveillance test on several deluge
valves In preaction sprinkler systems. One valve failed to trip, and its push rod had to be
forced back manually after completely isolating and draining the diaphragm chamber, closing
the main Isolation valve, opening the main drain, and opening the valve faceplate. Inspection of
the rubber diaphragm showed a "dimple*near the diaphragm chamber supply inlet. The valve
had been left in the tripped condition for about 22 days in May 1997, then Itwas reset to the
IN 99-07 March 22, 1999 operable, ready position until this surveillance (for about 9 months). As a result of this failure, the licensee tested a sample of six additional valves that had been left In a tripped condition for
long periods.
One of these valves failed to trip electrically. Inspection of this valve Indicated that the push rod
appeared to be misaligned in the retainer ring slot and some corrosion had formed where the
rod slides through the ring. Also, the diaphragm was stuck to the face of the push rod. In total, five of the six sample valves and one other valve failed to operate properly.
In June 1998, as part of the ongoing testing program, one of the deluge valves was manually
actuated from its pull station; It failed to operate. An Investigation Indicated that the pull station
housing had rotated and was preventing complete travel (i.e., fully open) of the valve handle.
After adjusting the pull station housing, the handle was actuated again and the deluge valve
successfully tripped.
The team commissioned by the licensee to study the problems with the Grinnell A-4 valves
concluded that, although the cause and effect are not known, It appears that the failure
occurred within a tripped open valve exposed to pressure over time. This exposure appears to
cause the valve to fail after being reset. The team noted that the manufacturer does not
recommend leaving the tripped-open valves pressurized for a significant length of time. The
root-cause team is also exploring other potential failure mechanisms of the Grinnell A-4 valve.
The staff is continuing to monitor the licensee's investigation into the valve failures.
Discussion
The staff noted several potential problems as a result of this event. First, as discussed above, when deluge valves are left in the tripped condition for long periods, the rubber diaphragm is
forced against the Inlet side of the diaphragm chamber. When the valves are reset, the
diaphragm may then bond to the push rod flange, or pinch between the push rod flange and
retainer ring, thus keeping the valve from operating properly. In the set condition, the rubber
diaphragm Is held by water pressure against the flange and retainer and bonding may possibly
occur then. Bonding may be more probable In systems using well water or raw river water
rather than potable water supplies.
The staff also notes that it is a common practice for many plants to keep their preaction
sprinkler system deluge valves in a tripped condition for long periods, usually during outages
when welding or other activities are taking place, which Increases the likelihood of spurious
system actuation. Grinnell recommends that the valve be reset within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of any valve
operation and that the Internal components of valves be cleaned and inspected after any valve
operation.
Second, the use of plant-supplied or plant-designed trim packages Instead of the UL- or FM-
certified packages and designs supplied by the valve manufacturer may result In Issues such as
undersized drain lines, which may restrict the bleedoff from the diaphragm chamber and further
Inhibit valve actuation.
IN 9907 March 22, 1999 Third, an evaluation by Grinnell concluded that the valve release mechanism may be jamming
from the high pressure and surging conditions Inthe fire protection water supply system. The
jamming may be related to deep indentations on the valve latch. Cleaning and Inspection of the
valves' internal components should reveal these potential problems.
While reviewing this event, the staff noted that the licensee performs full-flow testing. It is the
staff's understanding that many plants isolate the deluge valves from the main fire protection
water supply during individual system valve testing. This practice is a potential testing
weakness and may mask the actuation problems discussed herein. With the deluge valve
isolated, a limited volume of water is trapped in both the main line and the diaphragm chamber
supply line. The water Inthe diaphragm chamber is slowly bled off until the valve opens. If the
diaphragm has bonded to the flange, the inlet to the diaphragm chamber could be partially
blocked, Inhibiting (but not preventing) valve actuation. However, during normal operation with
full flow from the diaphragm chamber supply line, the primary flow path would follow the supply
line to the drain, thus trapping water In the diaphragm chamber and preventing valve actuation.
Note the following statement in National Fire Protection Association (NFPA) Standard 25
("Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection
Systems," 1995 edition, section 94.3.2.2): lEach deluge or preaction valve shall be trip tested
annually at full flow [emphasis added] In warm weather and In accordance with the
manufacturer's Instructions.' The valve manufacturer may also have special requirements for
inservice testing. The A-4 valve manufacturer recommends partial flow testing where full-flow
testing is undesirable.
Another event involving the failure of automatic deluge valves took place at Grand Gulf in 1983, and is discussed in IN 84-16, "Failure of Automatic Sprinkler System Valves to Operate." While
the licensee was performing an operational test of the emergency diesel generator (EDG), a fire
occurred in the diesel. The automatic deluge valve (6-inch Model C valve manufactured by the
Automatic Sprinkler Company of America (ASCO)) failed to open. Approximately 3 months
later, a Model C valve In a preaction sprinkler system for the EDG room at Grand Gulf failed to
operate during a test. In both cases, scoring was found in the actuation weight upper guide
collar and in the box that encloses the weight guide bushing.
Another Instance of repeated failures of a preaction deluge valve occurred In 1997 at Limerick
Unit 1. A Model AD 6-inch deluge valve manufactured by Star Sprinkler, Inc., did not actuate
during a surveillance test. The frequency of testing had been increased because of earlier
failures caused by suspected mechanical problems. Continued troubleshooting of the valve
failures uncovered a potential voltage mismatch between the deluge valve and the Chemetron
release control panel, resulting in marginal power available to operate the valve. The Model AD
valves were subsequently replaced with Model AGO valves, also manufactured by Star Sprinkler.
IN 99-07 March 22, 1999 Related Generic Communications
- IN 84-16, OFailure of Automatic Sprinkler System Valves to Operate," Issued March 2,
1984.
- IN 92-28, 'inadequate Fire Suppression System Testing,' Issued April 8, 1992.
- IN 97-22, 'Potential for Failure of the OMEGA Series Sprinkler Heads," issued
September 22, 1997.
This information notice requires no specific action or written response. However, addressees
are reminded that they are required to consider Industry-wide operating experience (including
NRC information notices) where practical, when setting goals and performing periodic
evaluations under 10 CFR 50.65, 'Requirement for Monitoring the Effectiveness of
Maintenance at Nuclear Power Plants.! If you have any questions about the information in this
notice, please contact one of the technical contacts listed below or the appropriate Office of
Nuclear Reactor Regulation (NRR) project manager.
David B. Matthews, Director
Division of Regulatory Improvement Programs
Office of Nuclear Reactor Regulation
Technical contacts: Mark H. Salley, NRR Robert Caldwell, RII
301-415-2840 334-899-3386 E-mail: mxs36-nrc.aov E-mail: rkcl(&nrc.ciov
William F. Burton, NRR
301-415-2853 E-mail: wfbS-nrc.aov
Attachment: Ust of Recently Issued NRC Information Notices
I
IN 99-07 March 22, 1999 Related Generic Communications
- IN 84-16, "Failure of Automatic Sprinkler System Valves to Operate," issued March 2,
1984.
- IN 92-28, "Inadequate Fire Suppression System Testing," issued April 8, 1992.
- IN 97-22, "Potential for Failure of the OMEGA Series Sprinkler Heads," issued
September 22, 1997.
This information notice requires no specific action or written response. However, addressees
are reminded that they are required to consider industry-wide operating experience (including
NRC information notices) where practical, when setting goals and performing periodic
evaluations under 10 CFR 50.65, "Requirement for Monitoring the Effectiveness of
Maintenance at Nuclear Power Plants." If you have any questions about the information in this
notice, please contact one of the technical contacts listed below or the appropriate Office of
Nuclear Reactor Regulation (NRR) project manager.
Original signed by
S.F. Newberry
FOR David B. Matthews, Director
Division of Regulatory Improvement Programs
Office of Nuclear Reactor Regulation
Technical contacts: Mark H. Salley, NRR Robert Caldwell, RII
301-415-2840 334-899-3386 E-mail: mxs3(&nrc.aov E-mail: rkc1a)nrc.aov
William F. Burton, NRR
301-415-2853 E-mail: wfbtfinrc.oov
Attachment: List of Recently Issued NRC Information Notices
DOCUMENT NAME: S:MDRPMSEC%9907.IN
To receive a copv of this document. Indicate In the box C=Copy wlo attachment/enclosure E=Copy with attachmentlenclosure N = No copy
OFFICE PECB I jTECHEDITOR l SPLB II uSPLBlI
NAME -WFBurton* .RSanders* MHSalley* I KSWest*
DATE
- ".- II I1QIQQ
__I__ _-__-_
1114 /99
....-- . 3/9/99
.. -
319l99
11 - -J
OFFICE IC:SPLIB
I D:DSSA l (A)C:PECB I D:DRI II 1 NAME LMarsh* GHolahan* RDennig* DMatdhlwsr
DATE 3/8/99 3/11/99 j 3/15/99 al1V99 ]
OFFICIAL RECORD COPY
IN 99-xx
March xx, 1999 Related Generic Communications
- IN 84-16, "Failure of Automatic Sprinkler System Valves to Operate," issued March 2,
1984.
- IN 92-28, "Inadequate Fire Suppression System Testing," issued April 8, 1992.
- IN 97-22, "Potential for Failure of the OMEGA Series Sprinkler Heads," issued
September 22, 1997.
This information notice requires no specific action or written response. However, addressees
are reminded that they are required to consider industry-wide operating experience (including
NRC information notices) where practical, when setting goals and performing periodic
evaluations under 10 CFR 50.65, 'Requirement for Monitoring the Effectiveness of
Maintenance at Nuclear Power Plants." If you have any questions about the information in this
notice, please contact one of the technical contacts listed below or the appropriate Office of
Nuclear Reactor Regulation (NRR) project manager.
David B. Matthews, Director
Division of Reactor Program Management
Office of Nuclear Reactor Regulation
Technical contacts: Mark H. Salley, NRR Robert Caldwell, RII
301-415-2840 334-899-3386 E-mail: mxs3(&'nrc.gov E-mail: rkcl (&nrc.gov
William F. Burton, NRR
301-415-2853 E-mail: wfb(nrc.aov
Attachment: List of Recently Issued NRC Information Notices
DOCUMENT NAME: G:\WFB\INDELUG
To receive a coDY of this document. indicate in the box C=Conv wio attachment/enclosure E=Coov with attachment/endosure N = No codv
OFFICE IPECB IT EDITORlII SPLBIIISPLB
I I I
NAME WFBurton HA RSanders* MHSalley 41,/7 Kswest it), L-
DAT ll ,
- D:A:TE .i .& 4 i~ 1/14
1/49 /99 1 .Iq199
1 -Ax" Il IA E.....................
go./99 l
OFFICE C:SPLB lI[ D:DSSA (A)C D:DRPM I
NAME f IMarsh W 1W GHolahan .j RDeigA-' l DMatthews
DATE _ _1_99 ?I /L199 OFFICIAL RECORD COPY
J13/ 99 1/ /99
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list | - Information Notice 1999-01, Deterioration of High-Efficiency Particulate Air Filters in a Pressurized Water Reactor Containment Fan Cooler Unit (20 January 1999)
- 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 Sources (21 January 1999, Topic: Brachytherapy)
- Information Notice 1999-03, Exothermic Reactors Involving Dried Uranium Oxide Powder (Yellowcake) (29 January 1999, Topic: Brachytherapy)
- Information Notice 1999-04, Unplanned Radiation Exposures to Radiographers, Resulting from Failures to Follow Proper Radiation Safety Procedures (1 March 1999, Topic: Brachytherapy)
- Information Notice 1999-05, Inadvertent Discharge of Carbon Dioxide Fire Protection System and Gas Migration (8 March 1999, Topic: Brachytherapy)
- Information Notice 1999-06, 1998 Enforcement Sanctions as a Result of Deliberate Violations of NRC Employee Protection Requirements (19 March 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-06, 1998 Enforcement Sanctions As a Result of Deliberate Violations of NRC Employee Protection Requirements (19 March 1999, Topic: Enforcement Discretion)
- Information Notice 1999-07, Failed Fire Protection Deluge Valves & Potential Testing Deficiencies in Preaction Sprinkler Systems (22 March 1999, Topic: Safe Shutdown)
- Information Notice 1999-08, Urine Specimen Adulteration (26 March 1999, Topic: Brachytherapy)
- Information Notice 1999-09, Problems Encountered When Manually Editing Treatment Data on the Nucletron Microselectron-HDR (New) Model 105-999 (24 March 1999, Topic: Brachytherapy)
- Information Notice 1999-10, Degradation of Prestressing Tendon Systems in Prestresssed Concrete Containments (13 April 1999)
- Information Notice 1999-11, Incidents Involving the Use of Radioactive Iodine-131 (16 April 1999, Topic: Brachytherapy)
- Information Notice 1999-12, Year 2000 Computer Systems Readiness Audits (28 April 1999, Topic: Brachytherapy)
- Information Notice 1999-13, Insights from NRC Inspections of Low-and Medium-Voltage Circuit Breaker Maintenance Programs (29 April 1999, Topic: Brachytherapy)
- Information Notice 1999-14, Unanticipated Reactor Water Draindown at Quad Cities Unit 2, Arkansas Nuclear One Unit 2, & FitzPatrick (5 May 1999, Topic: Reactor Vessel Water Level, Brachytherapy)
- Information Notice 1999-15, Misapplication for 10CFR Part 71 Transportation Shipping Cask Licensing Basis to 10CFR Part 50 Design Basis (27 May 1999, Topic: Brachytherapy)
- Information Notice 1999-16, Federal Bureau of Investigation'S Nuclear Site Security Program (28 May 1999, Topic: Brachytherapy)
- Information Notice 1999-17, Problems Associated with Post-Fire Safe-Shutdown Circuit Analyses (3 June 1999, Topic: Hot Short, Safe Shutdown, Temporary Modification, Emergency Lighting, Fire Protection Program)
- Information Notice 1999-18, Update on Nrc'S Year 2000 Activities for Material Licensees and Fuel Cycle Licensees and Certificate Holders (14 June 1999, Topic: Brachytherapy)
- Information Notice 1999-19, Rupture of the Shell Side of a Feedwater Heater at the Point Beach Nuclear Plant (23 June 1999)
- Information Notice 1999-20, Contingency Planning for the Year 2000 Computer Problem (25 June 1999, Topic: Brachytherapy)
- Information Notice 1999-21, Recent Plant Events Caused by Human Performance Errors (25 June 1999, Topic: Probabilistic Risk Assessment)
- Information Notice 1999-22, 10CFR 34.43(a)(1); Effective Date for Radiographer Certification and Plans for Enforcement Discretion (25 June 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-23, Safety Concerns Related to Repeated Control Unit Failures of the Nucletron Classic Model High-Dose-Rate Remote Afterloading Brachytherapy Devices (6 July 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-24, Broad-Scope Licensees' Responsibilities for Reviewing and Approving Unregistered Sealed Sources and Devices (12 July 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-25, Year 2000 Contingency Planning Activities (10 August 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-26, Safety and Economic Consequences of Misleading Marketing Information (24 August 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-27, Malfunction of Source Retraction Mechanism in Cobalt-60 Teletherapy Treatment Units (2 September 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-28, Recall of Star Brand Fire Protection Sprinkler Heads (30 September 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-30, Failure of Double Contingency Based on Administrative Controls Involving Laboratory Sampling and Spectroscopic Analysis of Wet Uranium Waste (8 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-30, Failure of Double Contingency Based On Administrative Controls Involving Laboratory Sampling and Spectroscopic Analysis of Wet Uranium Waste (8 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-31, Operational Controls to Guard Against Inadventent Nuclear Criticality (17 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-31, Operational Controls To Guard Against Inadventent Nuclear Criticality (17 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-32, Effect of Year 2000 Issue on Medical Licenseess (17 December 1999, Topic: Brachytherapy)
- Information Notice 1999-32, Effect of Year 2000 Issue on Medical Licensees (17 December 1999, Topic: Brachytherapy, Overdose, Underdose)
- Information Notice 1999-33, Management Of Wastess Contaminated with Radioactive Materialss (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-33, Management of Wastes Contaminated with Radioactive Materials (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-33, Management Of Wastes Contaminated with Radioactive Materials (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-33, Management Of Wastes Contaminated With Radioactive Materials (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-34, Potential Fire Hazard in the Use of Polyalphaolefin in Testing of Air Filter (28 December 1999)
- Information Notice 1999-34, PotentialPotentialPotential FireFireFire HazardHazardHazard ininIn thetheThe UseUseUse ofofOf PolyalphaolefinPolyalphaolefinPolyalphaolefin ininIn TestingTestingTesting ofofOf AirAirAir FilterFilterFilter (28 December 1999)
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