Hydrogen Explosion While Grinding in the Vicinity of Drained and Open Reactor Coolant SystemML070220265 |
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, Sterling, 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, 05000514, 05000599, 05000000, 05000515, 05000355, 05000502, 05000600, Zimmer, Fort Saint Vrain, Washington Public Power Supply System, Shoreham, Satsop, Trojan, Allens Creek, Atlantic Nuclear Power Plant, Perkins, Cherokee, Clinch River, Skagit, Marble Hill, Black Fox, Hartsville, Phipps Bend, Yellow Creek |
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Issue date: |
07/23/1982 |
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From: |
Jordan E NRC/IE |
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To: |
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References |
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IN-82-028 NUDOCS 8204210401 |
Download: ML070220265 (4) |
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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, Sterling, 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, 05000514, 05000599, 05000000, 05000515, 05000355, 05000502, 05000600, Zimmer, Fort Saint Vrain, Washington Public Power Supply System, Shoreham, Satsop, Trojan, Allens Creek, Atlantic Nuclear Power Plant, Perkins, Cherokee, Clinch River, Skagit, Marble Hill, Black Fox, Hartsville, Phipps Bend, Yellow Creek |
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Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination2006-07-13013 July 2006 E-mail from M. 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 [[:Sterling]] 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 [[:05000514]] OR [[:05000599]] OR [[:05000000]] OR [[:05000515]] OR [[:05000355]] OR [[:05000502]] OR [[:05000600]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Washington Public Power Supply System]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Allens Creek]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Perkins]] OR [[:Cherokee]] OR [[:Clinch River]] OR [[:Skagit]] OR [[:Marble Hill]] OR [[:Black Fox]] OR [[:Hartsville]] OR [[:Phipps Bend]] OR [[:Yellow Creek]] </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 [[:Sterling]] 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 [[:05000514]] OR [[:05000599]] OR [[:05000000]] OR [[:05000515]] OR [[:05000355]] OR [[:05000502]] OR [[:05000600]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Washington Public Power Supply System]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Allens Creek]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Perkins]] OR [[:Cherokee]] OR [[:Clinch River]] OR [[:Skagit]] OR [[:Marble Hill]] OR [[:Black Fox]] OR [[:Hartsville]] OR [[:Phipps Bend]] OR [[:Yellow Creek]] </code>. |
SSINS No.: 6835 IN 82-28 UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF INSPECTION AND ENFORCEMENT
WASHINGTON, D.C. 20555 July 23, 1982 IE INFORMATION NOTICE NO. 82-28: HYDROGEN EXPLOSION WHILE GRINDING IN THE
VICINITY OF DRAINED AND OPEN REACTOR COOLANT
SYSTEM
Addressees
All nuclear power reactor facilities holding an operating license (OL) or
construction permit (CP).
Purpose
This information notice is provided as a notification of an event that may have
safety significance. It is expected that recipients will review the information
for applicability to their facilities. No specific action or response is
required at this time.
Description of Circumstances
On April 10, 1982, a hydrogen explosion occurred at Unit 1 of Arkansas Nuclear
One wtille maintenance personnel were grinding a recently cut high-prfssure
injection (HPI) pipe, approximately 18 inches from the nozzle connecting the
HPI pipe to the reactor coolant system (RCS) piping. At the time of the
explosion, the RCS was partially drained and the water level in the reactor
coolant piping was just below the HPI nozzle to permit radiography of the
nozzle and subsequent repair. (IE Information Notice No. 82-09 provides
details concerning the cracking problem in HPI piping at Babcock & Wilcox
plants.) The reactor coolant temperature was being maintained at approximately
IOOF by the decay heat removal system, and nitrogen cover gas was being
maintained in the reactor coolant piping. These conditions existed since the
RCS was depressurized and partially drained on March 29, 1982.
At approximately 1240 hours0.0144 days <br />0.344 hours <br />0.00205 weeks <br />4.7182e-4 months <br /> on April 10, 1982, the craftsmen, who were grinding
on the HPI pipe in preparation for welding, observed a bright flash at the
outlet of the HPI line and heard a loud "bang". The craftsman actually per- forming the grinding was physically blown away from the HPI pipe a distance of
about three feet. Personnel in other areas of the Unit I containment building
heard the explosion and felt the resulting concussion and mechanical vibration.
Additionally, some personnel outside of the containment building, including
operat6rs in the Unit I control room reported that they heard the explosion and
felt varying degrees of vibration. Although there were no physical injuries as
a result of this event, it should be mentioned that the craftsman's life was
endangered as he was working on a scaffold that was over 30 feet high.
The most recent RCS measurement of dissolved gas in reactor coolant had been
taken on March 26, 1982, just before commencing the plant cooldown and shutdown.
It indicated 39 standard cc of total gas/liter of coolant. The hydrogen
8ZO42-10401
IN 82-28 July 23, 1982 concentration was 43% of this total. Because the total gas concentration
exceeded the maximum allowed by plant procedures (30 cc/liter) for RCS
depressurization, the RCS was degassed for approximately 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> as cooldown
progressed. The total gas concentration was not measured after degassing had
been terminated because the RCS had been depressurized and the sampling method
is effective only when the RCS pressure is greater than several hundred psig.
Atmospheric samples had not been taken to measure hydrogen and oxygen concen- trations in the vicinity of the open HPI pipe. (This had been done at other
Babcock and Wilcox plants which were undergoing nozzle repair.)
The reason for the presence of an explosive concentration of hydrogen is
unknown. It could have been caused by (a) inadequate degassing, (b) failure to
purge the HPI pipe with nitrogen, or (c) failure to temporarily plug the open
HPI pipe.
Subsequent inspection of the affected HPI line, the first upstream check valve
in the HPI line, and the corresponding nozzle and safe-end on the RCS cold leg
indicated no signs of damage as a result of the explosion.
No written response to this information is required. If you need more informa- tion about this matter, please contact the Regional Administrator of the
appropriate NRC Regional Office or this office.
Edward L. Jordan, Director
Division of Engineering and
Quality Assurance
Technical Contact:
W. Marinelli
301-492-9654 Attachment:
List of Recently Issued IE Information Notices
WPU:JD DEQA: IE DEQA: IE DEQA: IE DEQA: IE D: DEQA: IE
7/20/82 WMarinelli RWoodruff JCunningham RBaer EJordan
5520 7/ /82 7/ /82 7/ /82 7/ /82 7/4ý C/82
IN 82- X ,q"1982 Page 3 of
Atmospheric samples had not been taken to measure hydrogen and oxygen
concentrations in the vicinity of the open HPI pipe. (This had been done at
other Babcock and Wilcox plants which were undergoing nozzle repair).
The reason for the presence of an explosive concentration of hydrogen is
unknown. It could have been caused by (a) inadequate degassing, (b) failure
to purge the HPI pipe with nitrogen, or (c) failure to temporarily plug the
open HPI pipe.
Subsequent inspection of the affected HPI line, the first upstream check valve
in the HPI line, and the corresponding nozzle and safe-end on the RCS cold leg
inditated no signs of damage as a result of the explosion.
No written response to this information is required. if you need more about
this matter, please contact the Regional Administrator of the appropriate
NRC Regional Office.
Sincerely, Edward L. Jordan, Director
Division of Engineering and.
Quality Assurance
Office of Inspection and Enforcement
Technrical Contact: W. Marinelli
301-492-9654 Attachment:
Recently issued IE Information Notices
mkm DEQA:IE DEQA:IE E D D
6/17/82 WMarinelli RWoodruff JCtulingham RBaer
5520 6/1j/82 6 6/ý0W 82 60/82
Attachment
IN 82-28 July 23, 1982 LIST OF RECENTLY ISSUED
IE INFORMATION NOTICES
Information Date of
Notice No. Subject Issue Issued to
82-27 Control of Radiation Levels 7/23/82 All medical
in Unrestricted Areas institutions
Adjacent to Brachytherapy
Patients
82-26 RCIC and HPCI Turbine 7/23/82 All BWR power
Exhaust Check Valve Failures reactor facilities
holding and OL or CP
82-25 Failures of Hiller Actuators 7/22/82 All power reactor
upon Gradual Loss of Air facilities holding
Pressure an OL or CP
82-24 Water Leaking from Uranium 7/20/82 All NRC licensed
Hexafluoride Overpacks enriched uranium
fuel fabrication
plants
81-26, Clarification of Placement 7/20/82 All power reactor
Part 3, of Personnel Monitoring facilities holding
Sup. No. 1 Devices for External an OL or CP
Radiation
82-23 Main Steam Isolation Valve 7/16/82 All BWR power
(MSIV) Leakage reactor facilities
holding an OL or CP
82-22 Failures in Turbine Exhaust 7/9/82 All power reactor
Lines facilities holding
an OL or CP
82-21 Buildup of Enriched Uranium 6/30/82 All uranium and
in Effluent Treatment Tanks plutonium fuel
fabrication
licensees
82-20 Check Valve Problems 6/28/82 All power reactor
facilities holding
an OL or CP
OL = Operating License
CP = Construction Permit