Cracking of Surge Ring Brackets in Large General Electric Company Electric MotorsML031130560 |
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, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant, Skagit, Marble Hill |
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Issue date: |
07/02/1987 |
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From: |
Rossi C Office of Nuclear Reactor Regulation |
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To: |
|
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References |
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IN-87-030, NUDOCS 8706250407 |
Download: ML031130560 (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, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant, Skagit, Marble Hill |
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Category:NRC Information Notice
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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 [[: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 [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Skagit]] OR [[:Marble Hill]] </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 [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Skagit]] OR [[:Marble Hill]] </code>. |
p. .
SSINS No.: 6835 IN 87-30
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C.
July 2, 1987 NRC INFORMATION NOTICE NO. 87-30: CRACKING OF SURGE RING BRACKETS IN LARGE
GENERAL ELECTRIC COMPANY ELECTRIC MOTORS
Addressees
All nuclear power reactor facilities holding an operating license or a con- struction permit.
Purpose
This notice is provided to alert recipients to a potentially significant safety
problem that could result in the loss of safety-related equipment,' such as
residual heat removal (RHR), core spray, and high-pressure pumps that are
driven by large, vertical electric motors manufactured by General Electric
Company (GE). It is expected that recipients will review this information for
applicability and consider actions, as appropriate, to preclude a similar
problem at their facilities. However, suggestions contained'in this notice do
not constitute NRC requirements; therefore, no specific action or written
response is required.
Background:
Felt blocks are used in large electric motors to keep the windings separated
where they loop back at the end of the stator. The blocks are attached to a
surge ring that is held in place by L-shaped surge ring brackets welded to the
surge ring and bolted to the motor casing. Failure of-these surge ring brack- ets and cracking of the felt blocks allows movement and wear of the end-turns, leading to a reduction in insulation resistance and possible motor failure. In
addition, broken pieces of the surge ring bracket may enter the space between
the stator and the rotor, resulting in electrical or mechanical motor degrada- tion.
Description of Circumstances
During the 1985 outage at Peach Bottom Atomic Power Station, Unit 3, broken
surge ring brackets were discovered in a 2000-horsepower (hp) RHR pump motor
07/
TN 87-30
July 2, 1987 and a 600-hp core spray pump motor. Attempts to repair the brackets by welding
were unsuccessful, and they were removed from the motors at GE's suggestion.
The licensee' for Peach Bottom is reevaluating the motor design and the need to
replace the brackets.
During the week of November 10, 1986, the licensee for Cooper Nuclear Station
inspected Its 1000-hp RHR pump motors and discovered that three of four motors
had broken lower surge ring brackets and cracked upper and lower end-turn felt
blocks. In the B motor, five of six lower brackets were fractured. Repairs
were made and periodic visual inspections are being conducted.
GE informed the NRC on March 24, 1987 that the equipment affected in BWR plants
includes the RHR, core spray, and high-pressure core spray system electric
motors. GE recommended that annual inspections be performed until operating
experience indicates that this is no longer necessary. At plants where the
support brackets have been removed, GE stated that restoration actions should
be taken as soon as possible. Although GE notified BWR licensees of the Cooper
Station event, it did not notify PWR licensees. A list, which was provided to
the NRC by GE, of PWR facilities that have received large, vertical electric
motors from GE is attached. It should be noted that other'plants could have
similar motors.
Discussion:
The surge ring bracket, a 1-inch-wide by 1/8-inch-thick L-shaped piece of
carbon steel, has been breaking at the sharp bend. After the bracket breaks, a
1-inch-long portion remains attached to the surge ring by a double fillet weld.
If this weld fails, the 1-inch by 1-inch by 1/8-inch piece of steel may move
inside the motor. Although tests conducted at Cooper Station showed signifi- cant cyclic loading of the bracket when the motor was started, the bracket also
was shown to be subject to vibration during steady-state operation.
At Cooper Nuclear Station, surge ring brackets of an improved design, which
incorporated a larger bend radius, were installed and the motor Insulation
system was revarnished to fill and bond the cracks in the felt blocks. The
licensee is visually inspecting the brackets on a regular basis. This examina- tion is conducted without disassembling the pump motor, using either a
boroscope or a mirror inserted through the existing air vents. GE has recom- mended a complete disassembly and inspection at 10-year intervals to ensure the
continued qualification of these motors.
V .
IN 87-30
July 2, 1987 No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the Regional
Administrator of the appropriate regional office or this office.
Char es E ossi, Director
Division of OperationalEvents Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Paul Cortland, OSP
(301) 492-7190
Attachments:
1. List of PWR Facilities Known to Have Received
Large, Vertical Electric Motors from General Electric Company
2. List of Recently Issued NRC Information Notices
Attachment 1 IN 87-30
July 2, 1987 LIST OF PWR FACILITIES KNOWN TO HAVE RECEIVED LARGE,
VERTICAL ELECTRIC MOTORS FROM GENERAL ELECTRIC COMPANY
The plant numbers were not Identified for multi-unitsfacilities.
PLANT MOTOR SIZE IN HORSEPOWER
Arkansas Nuclear One 800
Bellefonte Nuclear Plant 900
Farley Nuclear Plant 600
Harris Nuclear Power Plant 1300
Indian Point Station 400
Millstone Nuclear Power Station 500, 600, 700
North Anna Power Station 400
Palo Verde Nuclear Station 600
Salem Nuclear Generating Station 1000
Seabrook Nuclear Station 600, 800
Sequoyah Nuclear Plant 700
SNUPPS 1750
St. Lucie Plant 500, 600
Turkey Point Plant 500
Vogtle Nuclear Plant 700
J 7- Attachment 2 IN 17-30
July P. 1987 LIST OF RECENT1.1 ' ISSUED
INFORMATION NOTIC:ES 1987
.nfn~tq.n
n-t. of-0
Iotice No. Sub~act_ Issuance Issued to
87-29 Recent Safet :y-Related 6/26/87 Incidents at t Large All NRK licensees
authorized to possess
Irradiators. and use sealed sources
in large irradiators.
87-28 Air Systems Problems at 6/22/87 All nuclear power
U.S. Light Water Reactors reactor facilities
holding an OL or CP.
87-27 Iranian Official Implie!. 6/10/87 All nuclear power
Vague Threat to U.S. reactor facilities
Resources holding an OL or CP,
research and nonpower
reactor facilities.
and fuel fabrication
and processing
facilities using or
possessinq formula
quantities of soecial
nuclear material.
87-26 Cracks In Stiffening Rings 6/11/87 on 48-Inch Diameter UF All uranium fuel
Cylinders. fabrication and
6 conversion facilities.
87-25 Potentially Significant 6/11/87 Problems Pesulting from All nuclear power
reactor facilities
Human Error Involving holding an AL or CP.
Wrong Unit, Wrong Train, or Wrong Component Events.
87-24 Operational Experience 6/4/87 Involving Losses of All nuclear power
Electrical Inverters. reactor facilities
holding an OL or CP.
87-23 Loss of Decay Heat Removal 5/27/87 During Low Reactor Coolant All PWRfacilities
tevlrOperatto- holding an OL or CP.
-
87-22 Operator Licensing Requali- S/22/87 All research and
fication Examinations aL nonpower reactor
Nonpower Reactors facilities.
OL
CP
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D.C. 20555 FIRST CLASS MAIL
POSTAGE & FEES PAID
USNRC
WASH. D.C.
OFFICIAL BUSINESS PERMIT No. 047 PENALTY FOR PRIVATE USE. S300
I W
IN 87-30
July 2, 1987 No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the Regional
Administrator of the appropriate regional office or this office.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Paul Cortland, OSP
(301) 492-7190
Attachments:
1. List of PWR Facilities Known to Have Received
Large, Vertical Electric Motors from General Electric Company
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
- OSP *PPMB:ARM *AC/VIB:DRIS:NRR *C:OGCB:DOEA
PCortland TechEd EMerschoff CEBerlinger CERossi
6/25/87 6/25/87 6/25/87 6/25/87 6A87
IN 87-XX
June xx, 1987 No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the Regional
Administrator of the appropriate regional office or this office.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Paul Cortland, OSP
(301) 492-7190
Attachments:
1. List of PWR Facilities Known to Have Received
Large, Vertical Electric Motors from General Electric Company
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES (#6 C:OGCB:DOEA D: DOE~q
- OSP *PPMB:ARM *AC/VIB:DRIS:NRR
PCortland TechEd EMerschoff CEBerlinger CERossI
6/25/87 6/25/87 6/25/87 6/)087 6 M /87
.
IN 87-XX
June xx, 1987 No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the Regional
Administrator of the appropriate regional office or this office.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Paul Cortland, OSP
(301) 492-7190
Attachments:
1. List of PWR Facilities Known to Have Received
Large, Vertical Electric Motors from General Electric Company
2. List of Recently Issued NRC Information Notices
PPMB:ARMk,- C: OG94. UO-EA
D
PCorfl-aW' Te CEBerlinger CERossi
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list | - Information Notice 1987-02, Inadequate Seismic Qualification of Diaphragm Valves by Mathematical Modeling and Analysis (13 January 1987, Topic: Boric Acid)
- Information Notice 1987-03, Segregation of Hazardous and Low-Level Radioactive Wastes (15 January 1987, Topic: Boric Acid)
- Information Notice 1987-04, Diesel Generator Fails Test Because of Degraded Fuel (16 January 1987, Topic: Boric Acid, Coatings)
- Information Notice 1987-05, Miswiring in a Westinghouse Rod Control System (2 February 1987, Topic: Unanalyzed Condition, Boric Acid)
- Information Notice 1987-06, Loss of Suction to Low-Pressure Service Water System Pumps Resulting from Loss of Siphon (30 January 1987, Topic: Boric Acid)
- Information Notice 1987-07, Quality Control of Onsite Dewatering/Solidification Operations by Outside Contractors (3 February 1987, Topic: Boric Acid, Process Control Program)
- Information Notice 1987-08, Degraded Motor Leads in Limitorque DC Motor Operators (4 February 1987, Topic: Boric Acid, Anchor Darling)
- Information Notice 1987-09, Emergency Diesel Generator Room Cooling Design Deficiency (5 February 1987, Topic: Probabilistic Risk Assessment)
- Information Notice 1987-10, Potential for Water Hammer During Restart of Residual Heat Removal Pumps (11 February 1987)
- Information Notice 1987-11, Enclosure of Vital Equipment within Designated Vital Areas (13 February 1987, Topic: Contraband)
- Information Notice 1987-11, Enclosure of Vital Equipment Within Designated Vital Areas (13 February 1987, Topic: Contraband)
- Information Notice 1987-12, Potential Problems with Metal Clad Circuit Breakers, General Electric Type AKF-2-25 (13 February 1987)
- Information Notice 1987-13, Potential for High Radiation Fields Following Loss of Water from Fuel Pool (24 February 1987)
- Information Notice 1987-14, Actuation of Fire Suppression System Causing Inoperability of Safety-Related Ventilation Equipment (23 March 1987, Topic: Water hammer)
- Information Notice 1987-15, Compliance with the Posting Requirements of Subsection 223b of the Atomic Energy Act of 1954, as Amended (25 March 1987)
- Information Notice 1987-15, Compliance with the Posting Requirements of Subsection 223B of the Atomic Energy Act of 1954, As Amended (25 March 1987)
- Information Notice 1987-16, Degradation of Static O Ring Pressure Switches (2 April 1987)
- Information Notice 1987-17, Response Time of Scram Instrument Volume Level Detectors (7 April 1987, Topic: Scram Discharge Volume)
- Information Notice 1987-18, Unauthorized Service on Teletherapy Units by Nonlicensed Maintenance Personnel (8 April 1987)
- Information Notice 1987-19, Perforation and Cracking of Rod Cluster Control Assemblies (9 April 1987)
- Information Notice 1987-20, Hydrogen Leak in Auxiliary Building (20 April 1987, Topic: Excess Flow Check Valve)
- Information Notice 1987-21, Shutdown Order Issued Because Licensed Operators Asleep While on Duty (11 May 1987)
- Information Notice 1987-22, Operator Licensing Requalification Examinations at Nonpower Reactors (22 May 1987, Topic: License Renewal)
- Information Notice 1987-23, Loss of Decay Heat Removal During Low Reactor Coolant Level Operation (27 May 1987, Topic: Boric Acid)
- Information Notice 1987-24, Operational Experience Involving Losses of Electrical Inverters (4 June 1987)
- Information Notice 1987-25, Potentially Significant Problems Resulting from Human Error Involving Wrong Unit, Wrong Train, or Wrong Component Events (11 June 1987, Topic: Boric Acid, Fire Watch, Overspeed trip)
- Information Notice 1987-25, Potentially Significant Problems Resulting From Human Error Involving Wrong Unit, Wrong Train, or Wrong Component Events (11 June 1987, Topic: Boric Acid, Fire Watch)
- Information Notice 1987-26, Cracks in Stiffening Rings on 48-Inch-Diameter UF6 Cylinders (11 June 1987, Topic: Boric Acid)
- Information Notice 1987-26, Cracks in Stiffening Rings on 48-Inch-Diameter Uf6 Cylinders (11 June 1987)
- Information Notice 1987-27, Iranian Official Implies Vague Threat to U.S. Resources (10 June 1987, Topic: Boric Acid)
- Information Notice 1987-28, Air Systems Problems at U.S. Light Water Reactors (28 December 1987, Topic: Boric Acid)
- Information Notice 1987-29, Recent Safety-Related Incidents at Large Irradiators (26 June 1987, Topic: Coatings, Temporary Modification, Biofouling, Uranium Hexafluoride)
- Information Notice 1987-30, Cracking of Surge Ring Brackets in Large General Electric Company Electric Motors (2 July 1987)
- Information Notice 1987-31, Blocking Bracing, and Securing of Radioactive Materials Packages in Transportation (10 July 1987, Topic: Uranium Hexafluoride)
- Information Notice 1987-32, Deficiencies in the Testing of Nuclear-Grade Activated Charcoal (10 July 1987)
- Information Notice 1987-33, Applicability of 10 CFR Part 21 to Nonlicensees (24 July 1987, Topic: Commercial Grade)
- Information Notice 1987-34, Single Failures in Auxiliary Feedwater Systems (24 July 1987)
- Information Notice 1987-35, Reactor Trip Breaker, Westinghouse Model DS-416, Failed to Open on Manual Initiation from the Control Room (30 July 1987)
- Information Notice 1987-36, Significant Unexpected Erosion of Feedwater Lines (4 August 1987)
- Information Notice 1987-37, Compliance with the General License Provisions of 10 CFR Part 31 (10 August 1987)
- Information Notice 1987-39, Control of Particle Contamination at Nuclear Power Plants (21 August 1987, Topic: Fuel cladding, Overexposure)
- Information Notice 1987-40, Backseating Valves Routinely to Prevent Packing Leakage (31 August 1987, Topic: Packing leak)
- Information Notice 1987-41, Failures of Certain Brown Boveri Electric Circuit Breakers (31 August 1987)
- Information Notice 1987-42, Diesel Generator Fuse Contacts (4 September 1987)
- Information Notice 1987-43, Gaps in Neutron-Absorbing Material in High-Density Spent Fuel Storage Racks (8 September 1987)
- Information Notice 1987-44, Thimble Tube Thinning in Westinghouse Reactors (16 September 1987)
- Information Notice 1987-45, Recent Safety-Related Violations of NRC Requirements by Industrial Radiography Licensees (25 September 1987, Topic: High Radiation Area)
- Information Notice 1987-46, Undetected Loss of Reactor Coolant (30 September 1987)
- Information Notice 1987-48, Information Concerning the Use of Anaerobic Adhesive/Sealants (9 October 1987, Topic: Loctite)
- Information Notice 1987-49, Deficiencies in Outside Containment Flooding Protection (9 October 1987, Topic: Safe Shutdown)
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