Information Notice 1992-71, Partial Plugging of Suppression Pool Strainers at a Foreign BWR: Difference between revisions

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| issue date = 09/30/1992
| issue date = 09/30/1992
| title = Partial Plugging of Suppression Pool Strainers at a Foreign BWR
| title = Partial Plugging of Suppression Pool Strainers at a Foreign BWR
| author name = Rossi C E
| author name = Rossi C
| author affiliation = NRC/NRR
| author affiliation = NRC/NRR
| addressee name =  
| addressee name =  
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| page count = 7
| page count = 7
}}
}}
{{#Wiki_filter:_~K)UNITED STATES NUCLEAR REGULATORY
{{#Wiki_filter:_~K)
                                  UNITED STATES


COMMISSION
NUCLEAR REGULATORY COMMISSION


===OFFICE OF NUCLEAR REACTOR REGULATION===
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 September


30, 1992 NRC INFORMATION
WASHINGTON, D.C. 20555 September 30, 1992 NRC INFORMATION NOTICE 92-71:    PARTIAL PLUGGING OF SUPPRESSION POOL


NOTICE 92-71: PARTIAL PLUGGING OF SUPPRESSION
STRAINERS AT A FOREIGN BWR
 
POOL STRAINERS
 
AT A FOREIGN BWR


==Addressees==
==Addressees==
All holders of operating
All holders of operating licenses or construction permits for nuclear power
 
licenses or construction


permits for nuclear power reactors.
reactors.


==Purpose==
==Purpose==
The U.S. Nuclear Regulatory
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information
 
Commission (NRC) is issuing this information
 
notice to alert addressees
 
to the potential-for
 
loss of emergency


core cooling systems (ECCS) that was identified
notice to alert addressees to the potential-for loss of emergency core cooling


as a result of an event at a Swedish boiling water reactor (BWR). It is expected that recipients
systems (ECCS) that was identified as a result of an event at a Swedish


will review thel information
boiling water reactor (BWR). It is expected that recipients will review thel


for applicability
information for applicability to their facilities and consider actions, as


to their facilities
appropriate, to avoid similar problems. However, suggestions contained in


and consider actions, as appropriate, to avoid similar problems.
this information notice are not NRC requirements; therefore, no specific


However, suggestions
action or written response is required.


contained
==Description of Circumstances==
 
:
in this information
 
notice are not NRC requirements;
therefore, no specific action or written response is required.Description
 
of Circumstances:
On July 28, 1992, Sydkraft AB, the utility licensed by the Swedish regulatory
On July 28, 1992, Sydkraft AB, the utility licensed by the Swedish regulatory


agency for the BarsebAck
agency for the BarsebAck nuclear power plant, was restarting Unit 2 after the


nuclear power plant, was restarting
annual outage. While the reactor was at 1 or 2 percent power and at 435 psi, a leaking pilot valve caused a safety valve for the reactor vessel to open.


Unit 2 after the annual outage. While the reactor was at 1 or 2 percent power and at 435 psi, a leaking pilot valve caused a safety valve for the reactor vessel to open.This valve discharges
This valve discharges directly to the drywell. Reactor scram, high pressure


directly to the drywell. Reactor scram, high pressure safety injection, core spray, and containment
safety injection, core spray, and containment spray systems initiated


spray systems initiated automatically
automatically in response to the event. Steam from the open safety valve, impinging on thermally-insulated equipment, dislodged 440 pounds of metal- jacketed, mineral wool. An estimated 220 pounds of insulating material was


in response to the event. Steam from the open safety valve, impinging
washed into the suppression pool. Two of five strainers on the suction side


on thermally-insulated
of the ECCS pumps were in service and became partially plugged with mineral


equipment, dislodged
wool. Plugging caused pressure to decrease significantly across the strainers


440 pounds of metal-jacketed, mineral wool. An estimated
and caused indications of cavitation in one pump in about an hour after the


220 pounds of insulating
event began. The operators successfully back flushed the strainers and shut


material was washed into the suppression
down the reactor without additional problems.


pool. Two of five strainers
Discussion


on the suction side of the ECCS pumps were in service and became partially
In the safety analysis for Unit 2 of the Barsebdck plant, the licensee


plugged with mineral wool. Plugging caused pressure to decrease significantly
concluded that the strainers would not require back flushing during the first


across the strainers and caused indications
10 hours after a loss-of-coolant accident. Because of the event of July 28, the Swedish regulatory agency required Barseback Unit 2 and four other units


of cavitation
of similar design to remain shut down until this problem is resolved.


in one pump in about an hour after the event began. The operators
9209290014      e


successfully
III


back flushed the strainers
IN 92-71 September 30, 1992 This event at BarsebAck is directly applicable


and shut down the reactor without additional
by the NRC. That study evaluated the potential to an earlier study conducted


problems.Discussion
insulation to form debris and to be drawn to      for displaced thermal


In the safety analysis for Unit 2 of the Barsebdck
the study are documented in "Containment Sump  the  sump screen. The results of


plant, the licensee concluded
Revision 1, dated March 1984. The NRC concluded Performance,"  NUREG-0897, that the risk associated with


that the strainers
the sump clogging concern did not warrant backfitting


would not require back flushing during the first 10 hours after a loss-of-coolant
However, based on the Barsebdck event, this              of domestic plants.


accident.
conclusion is being reevaluated.


Because of the event of July 28, the Swedish regulatory
This information notice requires no specific


agency required Barseback
action or written response. If


Unit 2 and four other units of similar design to remain shut down until this problem is resolved.9209290014 e
you have any questions about the information


III IN 92-71 September
in this notice, please contact


30, 1992 This event at BarsebAck
the technical contact listed below or the appropriate


is directly applicable
Reactor Regulation (NRR) project manager.                Office of Nuclear


to an earlier study conducted by the NRC. That study evaluated
(arles        si, Director


the potential
Division of Operational Events Assessment


for displaced
Office of Nuclear Reactor Regulation


thermal insulation
Technical contact:  Robert L. Dennig, NRR


to form debris and to be drawn to the sump screen. The results of the study are documented
(301) 504-1156 Attachment:  List of Recently Issued NRC Information Notices


in "Containment
Attachment


Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded
IN 92-71 September 30, 1992 LIST OF RECENTLY ISSUED


that the risk associated
NRC INFORMATION NOTICES


with the sump clogging concern did not warrant backfitting
Information                                    Date of


of domestic plants.However, based on the Barsebdck
Notice No.             Subject                Issuance  Issued to


event, this conclusion
92-70          Westinghouse Motor-Operated    09/25/92  All holders of OLs or CPs


is being reevaluated.
Valve Performance Data                    for nuclear power reactors.


This information
Supplied to Nuclear Power


notice requires no specific action or written response.
Plant Licensees


If you have any questions
92-69          Water Leakage from Yard        09/22/92  All holders of OLs or CPs


about the information
Area Through Conduits                      for nuclear power reactors.


in this notice, please contact the technical
Into Buildings


contact listed below or the appropriate
91-29,          Deficiencies Identified        09/14/92  All holders of OLs or CPs


Office of Nuclear Reactor Regulation (NRR) project manager.(arles si, Director Division of Operational
Supp. 1        During Electrical Dis-                    for nuclear power reactors.


===Events Assessment===
tribution System Func- tional Inspections
Office of Nuclear Reactor Regulation


Technical
92-68          Potentially Substandard        09/10/92  All holders of OLs or CPs


contact: Robert L. Dennig, NRR (301) 504-1156 Attachment:
Slip-On, Welding Neck,                    for nuclear power reactors.
List of Recently Issued NRC Information


Notices
and Blind Flanges


Attachment
92-67          Deficiency in Design            09/10/92  All holders of OLs or CPs


IN 92-71 September
Modifications to Ad-                       for nuclear power reactors.


30, 1992 LIST OF RECENTLY ISSUED NRC INFORMATION
dress Failures of


NOTICES Information
Hiller Actuators Upon


Date of Notice No. Subject Issuance Issued to 92-70 92-69 91-29, Supp.92-68 92-67 1 Westinghouse
A Gradual Loss of


Motor-Operated
Air Pressure


Valve Performance
92-66          Access Denied to NRC            09/01/92  All holders of OLs or CPs


Data Supplied to Nuclear Power Plant Licensees Water Leakage from Yard Area Through Conduits Into Buildings Deficiencies
Inspectors at Five Star                    for nuclear power reactors


Identified
Products, Inc. and                        and all recipients of


During Electrical
Construction Products                      NUREG-0040, "Licensee, Con- Research, Fairfield,                      tractor and Vendor Inspec- Connecticut                                tion Status Report" (White.


Dis-tribution
Book).


System Func-tional Inspections
92-65          Safety System Problems          09/03/92  All holders of OLs or CPs


Potentially
Caused by Modifications                    for nuclear power reactors.


Substandard
That Were Not Adequately


Slip-On, Welding Neck, and Blind Flanges Deficiency
Reviewed and Tested


in Design Modifications
92-64          Nozzle Ring Settings            08/28/92  All holders of-OLs or CPs


to Ad-dress Failures of Hiller Actuators
on Low Pressure Water-                     for nuclear power reactors.


Upon A Gradual Loss of Air Pressure Access Denied to NRC Inspectors
Relief Valves


at Five Star Products, Inc. and Construction
OL = Operating License


===Products Research, Fairfield, Connecticut===
CP = Construction Permit
Safety System Problems Caused by Modifications


===That Were Not Adequately===
K>                                        <YIN 92-71 September 30, 1992 This event at Barseback is directly applicable to an earlier study conducted
Reviewed and Tested 09/25/92 09/22/92 09/14/92 09/10/92 09/10/92 09/01/92 09/03/92 08/28/92 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors and all recipients


of NUREG-0040, "Licensee, Con-tractor and Vendor Inspec-tion Status Report" (White.Book).All holders of OLs or CPs for nuclear power reactors.All holders of -OLs or CPs for nuclear power reactors.92-66 92-65 92-64 Nozzle on Low Relief Ring Settings Pressure Water-Valves OL = Operating
by the NRC. That study evaluated the potential for displaced thermal


License CP = Construction
insulation to form debris and to be drawn to the sump screen. The results of


Permit
the study are documented in "Containment Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded that the risk associated with


K><YIN 92-71 September
the sump clogging concern did not warrant backfitting of domestic plants.


30, 1992 This event at Barseback
However, based on the BarsebAck event, this conclusion is being reevaluated.


is directly applicable
This information notice requires no specific action or written response. If


to an earlier study conducted by the NRC. That study evaluated
you have any questions about the information in this notice, please contact


the potential
the technical contact listed below or the appropriate Office of Nuclear


for displaced
Reactor Regulation (NRR) project manager.


thermal insulation
Original Signed by


to form debris and to be drawn to the sump screen. The results of the study are documented
Charles E. Rossi


in "Containment
Charles E. Rossi, Director


Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded
Division of Operational Events Assessment


that the risk associated
Office of Nuclear Reactor Regulation
 
with the sump clogging concern did not warrant backfitting
 
of domestic plants.However, based on the BarsebAck
 
event, this conclusion
 
is being reevaluated.
 
This information
 
notice requires no specific action or written response.
 
If you have any questions


about the information
Technical con itact:    Robert L. Dennig, NRR


in this notice, please contact the technical
(301) 504-1156 Attachment:      List of Recently Issued NRC Information Notices


contact listed below or the appropriate
Document Name: 92-71.IN


Office of Nuclear Reactor Regulation (NRR) project manager.Original Signed by Charles E. Rossi Charles E. Rossi, Director Division of Operational
*SEE PREVIOUS CONCURRENCES


===Events Assessment===
DO                  *C/OGCB:DOEA:NRR*RPB:ADM
Office of Nuclear Reactor Regulation


Technical
C                    GHMarcus        TechEd


con itact: Robert L. Dennig, NRR (301) 504-1156 List of Recently Issued NRC Information
09/; 92              09/28/92        09/24/24
  *OEAB:DOEA:NRR*SC/OEAB:DOEA:NRR        *C/OEAB:DOEA:NRR*C/SPLB:DST:NRR       ICEP/OIPw


Notices Attachment:
RWWoodruff      RLDennig              AChaffee            CEMcCracken      AKenqeke
Document Name: 92-71.IN*SEE PREVIOUS CONCURRENCES


*OEAB:DOEA:NRR*SC/OEAB:DOEA:NRR
09/24/92        09/24/92              09/k8/92              09/1r/92        09/dg/92 V CEp/aze


RWWoodruff
SC~hLAt_- Jest)
  o1i  A                    e- rw W.


RLDennig 09/24/92 09/24/92 V CEp/aze SC~hLAt_-
,L .I
Jest)o1i A e- ,L .I DO *C/OGCB:DOEA:NRR*RPB:ADM


C GHMarcus TechEd 09/; 92 09/28/92 09/24/24*C/OEAB:DOEA:NRR*C/SPLB:DST:NRR
4.4a


ICEP/OIPw AChaffee CEMcCracken
-- - I


AKenqeke 09/k8/92 09/1r/92 09/dg/92 ago,. 4 e , am ASCo-- -I rw W. 4.4a
4 ago,.           ?.        e


NRCIN 92-XX September
,      am ASCo


xx, 1991 documented
NRCIN 92-XX


in "Containment
September xx, 1991 documented in "Containment Sump Performance," NUREG-0897, Revision 1, dated March


Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded
1984. The NRC concluded that the risk associated with the sump clogging concern


that the risk associated
did not warrant backfitting of domestic plants. However, based on the Barseback


with the sump clogging concern did not warrant backfitting
event and NUREG-0897, Revision 1, this conclusion is being reevaluated.


of domestic plants. However, based on the Barseback event and NUREG-0897, Revision 1, this conclusion
This information notice requires no specific action or written response. If you


is being reevaluated.
have any question about the information in this notice, please contact the


This information
technical contact listed below or the appropriate Office of Nuclear Reactor


notice requires no specific action or written response.
Regulation project manager.-
                                                      Charles E. Rossi, Director


If you have any question about the information
Division of Operational


in this notice, please contact the technical
Events Assessment
 
contact listed below or the appropriate


Office of Nuclear Reactor Regulation
Office of Nuclear Reactor Regulation


project manager.-Charles E. Rossi, Director Division of Operational
Technmical Contact:      Robert L. Dennig, NRR


===Events Assessment===
(301) 504-1156 Attachment:
Office of Nuclear Reactor Regulation
              1.    List of Recently Issued Information Notices


Technmical
* See previous page for concurrence.


Contact: Robert L. Dennig, NRR (301) 504-1156 Attachment:
CONCURRENCE:
1. List of Recently Issued Information
              OEAB            TECH EDITORS SC:OEAB            :SPLB    BC:OEAB        BC:OGCB


Notices* See previous page for concurrence.
*RWWoodruff      *JDMain        *RLDennig    CEMcCrcken  AEChaffee      GHMarcus


CONCURRENCE:
09/24/92        09/24/92      09/24/92        092/92    09/4&/92        09/ /92 D:DOEA          Or?    o
OEAB*RWWoodruff


09/24/92 D:DOEA CERossi 09/ /92 LevA^-t l40-m'-is -DcNpu P I 0 u; "r cz- NX,-,I- PO T-P'TECH EDITORS*JDMain 09/24/92 SC:OEAB*RLDennig 09/24/92:SPLB CEMcCrcken
SSC.l1er-       Dues


092/92 09 3-1 n I -Kc BC:OEAB AEChaffee 09/4&/92 BC:OGCB GHMarcus 09/ /92 Or? o SSC.l1er- Dues c,?/Xl/q;;
09   3-1 CERossi
410a.in CovCO LV V% ecc eLpCAPt"XU


I4 posh 4 aDSCe t.C do Lue g;Al CLL4e.?.-
09/    /92 c,?/Xl/q;;
V- IN 92-71 September
                                                              nI -Kc


29, 1992 This event at Barseback
410a.in


is directly applicable
LevA^-t l40-m'-
                                        CovCO


to an earlier study conducted by the NRC. That study evaluated
LV    ecc


the potential
V%
is-  DcNpu I P0u;"r                                                        t.C do            Lue  g;
                                      eLpCAPt"XU  I4 posh 4  aDSCe                          Al CLL4e.?.-
cz-    NX,-,I-  PO    T-P'


for displaced
V- IN 92-71 September 29, 1992 This event at Barseback is directly applicable to an earlier study conducted


thermal insulation
by the NRC. That study evaluated the potential for displaced thermal


to form debris and to be drawn to the sump screen. The results of the study are documented
insulation to form debris and to be drawn to the sump screen. The results of


in "Containment
the study are documented in "Containment Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded that the risk associated with


Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded
the sump clogging concern did not warrant backfitting of domestic plants.


that the risk associated
However, based on the Barsebdck event and NUREG-0897, Revision 1, this


with the sump clogging concern did not warrant backfitting
conclusion is being reevaluated.


of domestic plants.However, based on the Barsebdck
This information notice requires no specific action or written response. If


event and NUREG-0897, Revision 1, this conclusion
you have any questions about the information in this notice, please contact


is being reevaluated.
the technical contact listed below or the appropriate Office of Nuclear


This information
Reactor Regulation (NRR) project manager.


notice requires no specific action or written response.
Charles E. Rossi, Director


If you have any questions
Division of Operational Events Assessment


about the information
Office of Nuclear Reactor Regulation


in this notice, please contact the technical
Technical con tact:  Robert L. Dennig, NRR


contact listed below or the appropriate
(301) 504-1156 Attachment:  List of Recently Issued NRC Information Notices


Office of Nuclear Reactor Regulation (NRR) project manager.Charles E. Rossi, Director Division of Operational
Document Name: 92-71.IN


===Events Assessment===
*SEE PREVIOUS CONCURRENCES
Office of Nuclear Reactor Regulation


Technical
DOEA:NRR        C/OGCB:DOEA:NRR*RPB:ADM


con tact: Robert L. Dennig, NRR (301) 504-1156 List of Recently Issued NRC Information
CERossi        GHMarcus)GLK- TechEd


Notices Attachment:
09/ /92        09/,S/92 &o      09/24/24
Document Name: 92-71.IN*SEE PREVIOUS CONCURRENCES
*OEAB:DOEA:NRR*SC/OEAB:DOEA:NRR *C/OEAB:DOEA:NRR*C/SPLB:DST:NRR CEP/OIP


*OEAB:DOEA:NRR*SC/OEAB:DOEA:NRR
RWWoodruff      RLDennig          AChaffee        CEMcCracken      AKenneke


RWWoodruff
09/24/92        09/24/92          09/ /92        09/ /92          09/ /92


RLDennig 09/24/92 09/24/92 DOEA:NRR C/OGCB:DOEA:NRR*RPB:ADM
K>-
                                                                NRCIN 92-XX


CERossi GHMarcus)GLK-
September xx, 1991 technical contact listed below or the appropriate Office of Nuclear Reactor
TechEd 09/ /92 09/,S/92 &o 09/24/24*C/OEAB:DOEA:NRR*C/SPLB:DST:NRR


CEP/OIP AChaffee CEMcCracken
Regulation project manager.


AKenneke 09/ /92 09/ /92 09/ /92 K>-NRCIN 92-XX September
Charles E. Rossi, Director


xx, 1991 technical
Division of Operational


contact listed below or the appropriate
Events Assessment


Office of Nuclear Reactor Regulation
Office of Nuclear Reactor Regulation


project manager.Charles E. Rossi, Director Division of Operational
===Technical Contact:===


===Events Assessment===
===Robert L. Dennig, NRR===
Office of Nuclear Reactor Regulation
                      (301) 504-1156 Attachment:
1. List of Recently Issued Information Notices


Technical
CONCTRRENCE:
OEAB W'      TECH EDITOR                  BC: SPLU    BC: OEKB      BC: KCB


Contact: Robert L. Dennig, NRR (301) 504-1156 Attachment:
RWWoodruff    irgaln Pl                  CEMcCracken  AEChaffee    GHMarcus
1. List of Recently Issued Information


Notices CONCTRRENCE:
09 5/92      09/2,1/92      09/; f92      09/ /92      09/ /92      09/ /92 D: DOEA
OEAB W'RWWoodruff


09 5/92 D : DOEA CERossi 09/ /92 TECH EDITOR irgaln Pl 09/2,1/92 09/; f92 BC: SPLU CEMcCracken
CERossi


09/ /92 BC: OEKB AEChaffee 09/ /92 BC: KCB GHMarcus 09/ /92 410.in}}
09/ /92
                                                                            410.in}}


{{Information notice-Nav}}
{{Information notice-Nav}}

Latest revision as of 03:22, 24 November 2019

Partial Plugging of Suppression Pool Strainers at a Foreign BWR
ML031200327
Person / Time
Site: Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, 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  Entergy icon.png
Issue date: 09/30/1992
From: Rossi C
Office of Nuclear Reactor Regulation
To:
References
IN-92-071, NUDOCS 9209290014
Download: ML031200327 (7)
v • d • e


_~K)

UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 September 30, 1992 NRC INFORMATION NOTICE 92-71: PARTIAL PLUGGING OF SUPPRESSION POOL

STRAINERS AT A FOREIGN BWR

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors.

Purpose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this information

notice to alert addressees to the potential-for loss of emergency core cooling

systems (ECCS) that was identified as a result of an event at a Swedish

boiling water reactor (BWR). It is expected that recipients will review thel

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.

Description of Circumstances

On July 28, 1992, Sydkraft AB, the utility licensed by the Swedish regulatory

agency for the BarsebAck nuclear power plant, was restarting Unit 2 after the

annual outage. While the reactor was at 1 or 2 percent power and at 435 psi, a leaking pilot valve caused a safety valve for the reactor vessel to open.

This valve discharges directly to the drywell. Reactor scram, high pressure

safety injection, core spray, and containment spray systems initiated

automatically in response to the event. Steam from the open safety valve, impinging on thermally-insulated equipment, dislodged 440 pounds of metal- jacketed, mineral wool. An estimated 220 pounds of insulating material was

washed into the suppression pool. Two of five strainers on the suction side

of the ECCS pumps were in service and became partially plugged with mineral

wool. Plugging caused pressure to decrease significantly across the strainers

and caused indications of cavitation in one pump in about an hour after the

event began. The operators successfully back flushed the strainers and shut

down the reactor without additional problems.

Discussion

In the safety analysis for Unit 2 of the Barsebdck plant, the licensee

concluded that the strainers would not require back flushing during the first

10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> after a loss-of-coolant accident. Because of the event of July 28, the Swedish regulatory agency required Barseback Unit 2 and four other units

of similar design to remain shut down until this problem is resolved.

9209290014 e

III

IN 92-71 September 30, 1992 This event at BarsebAck is directly applicable

by the NRC. That study evaluated the potential to an earlier study conducted

insulation to form debris and to be drawn to for displaced thermal

the study are documented in "Containment Sump the sump screen. The results of

Revision 1, dated March 1984. The NRC concluded Performance," NUREG-0897, that the risk associated with

the sump clogging concern did not warrant backfitting

However, based on the Barsebdck event, this of domestic plants.

conclusion is being reevaluated.

This information notice requires no specific

action or written response. If

you have any questions about the information

in this notice, please contact

the technical contact listed below or the appropriate

Reactor Regulation (NRR) project manager. Office of Nuclear

(arles si, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical contact: Robert L. Dennig, NRR

(301) 504-1156 Attachment: List of Recently Issued NRC Information Notices

Attachment

IN 92-71 September 30, 1992 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

92-70 Westinghouse Motor-Operated 09/25/92 All holders of OLs or CPs

Valve Performance Data for nuclear power reactors.

Supplied to Nuclear Power

Plant Licensees

92-69 Water Leakage from Yard 09/22/92 All holders of OLs or CPs

Area Through Conduits for nuclear power reactors.

Into Buildings

91-29, Deficiencies Identified 09/14/92 All holders of OLs or CPs

Supp. 1 During Electrical Dis- for nuclear power reactors.

tribution System Func- tional Inspections

92-68 Potentially Substandard 09/10/92 All holders of OLs or CPs

Slip-On, Welding Neck, for nuclear power reactors.

and Blind Flanges

92-67 Deficiency in Design 09/10/92 All holders of OLs or CPs

Modifications to Ad- for nuclear power reactors.

dress Failures of

Hiller Actuators Upon

A Gradual Loss of

Air Pressure

92-66 Access Denied to NRC 09/01/92 All holders of OLs or CPs

Inspectors at Five Star for nuclear power reactors

Products, Inc. and and all recipients of

Construction Products NUREG-0040, "Licensee, Con- Research, Fairfield, tractor and Vendor Inspec- Connecticut tion Status Report" (White.

Book).

92-65 Safety System Problems 09/03/92 All holders of OLs or CPs

Caused by Modifications for nuclear power reactors.

That Were Not Adequately

Reviewed and Tested

92-64 Nozzle Ring Settings 08/28/92 All holders of-OLs or CPs

on Low Pressure Water- for nuclear power reactors.

Relief Valves

OL = Operating License

CP = Construction Permit

K> <YIN 92-71 September 30, 1992 This event at Barseback is directly applicable to an earlier study conducted

by the NRC. That study evaluated the potential for displaced thermal

insulation to form debris and to be drawn to the sump screen. The results of

the study are documented in "Containment Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded that the risk associated with

the sump clogging concern did not warrant backfitting of domestic plants.

However, based on the BarsebAck event, this conclusion is being reevaluated.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Original Signed by

Charles E. Rossi

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical con itact: Robert L. Dennig, NRR

(301) 504-1156 Attachment: List of Recently Issued NRC Information Notices

Document Name: 92-71.IN

  • SEE PREVIOUS CONCURRENCES

DO *C/OGCB:DOEA:NRR*RPB:ADM

C GHMarcus TechEd

09/; 92 09/28/92 09/24/24

  • OEAB:DOEA:NRR*SC/OEAB:DOEA:NRR *C/OEAB:DOEA:NRR*C/SPLB:DST:NRR ICEP/OIPw

RWWoodruff RLDennig AChaffee CEMcCracken AKenqeke

09/24/92 09/24/92 09/k8/92 09/1r/92 09/dg/92 V CEp/aze

SC~hLAt_- Jest)

o1i A e- rw W.

,L .I

4.4a

-- - I

4 ago,.  ?. e

, am ASCo

NRCIN 92-XX

September xx, 1991 documented in "Containment Sump Performance," NUREG-0897, Revision 1, dated March

1984. The NRC concluded that the risk associated with the sump clogging concern

did not warrant backfitting of domestic plants. However, based on the Barseback

event and NUREG-0897, Revision 1, this conclusion is being reevaluated.

This information notice requires no specific action or written response. If you

have any question about the information in this notice, please contact the

technical contact listed below or the appropriate Office of Nuclear Reactor

Regulation project manager.-

Charles E. Rossi, Director

Division of Operational

Events Assessment

Office of Nuclear Reactor Regulation

Technmical Contact: Robert L. Dennig, NRR

(301) 504-1156 Attachment:

1. List of Recently Issued Information Notices

  • See previous page for concurrence.

CONCURRENCE:

OEAB TECH EDITORS SC:OEAB :SPLB BC:OEAB BC:OGCB

  • RWWoodruff *JDMain *RLDennig CEMcCrcken AEChaffee GHMarcus

09/24/92 09/24/92 09/24/92 092/92 09/4&/92 09/ /92 D:DOEA Or? o

SSC.l1er- Dues

09 3-1 CERossi

09/ /92 c,?/Xl/q;;

nI -Kc

410a.in

LevA^-t l40-m'-

CovCO

LV ecc

V%

is- DcNpu I P0u;"r t.C do Lue g;

eLpCAPt"XU I4 posh 4 aDSCe Al CLL4e.?.-

cz- NX,-,I- PO T-P'

V- IN 92-71 September 29, 1992 This event at Barseback is directly applicable to an earlier study conducted

by the NRC. That study evaluated the potential for displaced thermal

insulation to form debris and to be drawn to the sump screen. The results of

the study are documented in "Containment Sump Performance," NUREG-0897, Revision 1, dated March 1984. The NRC concluded that the risk associated with

the sump clogging concern did not warrant backfitting of domestic plants.

However, based on the Barsebdck event and NUREG-0897, Revision 1, this

conclusion is being reevaluated.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical con tact: Robert L. Dennig, NRR

(301) 504-1156 Attachment: List of Recently Issued NRC Information Notices

Document Name: 92-71.IN

  • SEE PREVIOUS CONCURRENCES

DOEA:NRR C/OGCB:DOEA:NRR*RPB:ADM

CERossi GHMarcus)GLK- TechEd

09/ /92 09/,S/92 &o 09/24/24

  • OEAB:DOEA:NRR*SC/OEAB:DOEA:NRR *C/OEAB:DOEA:NRR*C/SPLB:DST:NRR CEP/OIP

RWWoodruff RLDennig AChaffee CEMcCracken AKenneke

09/24/92 09/24/92 09/ /92 09/ /92 09/ /92

K>-

NRCIN 92-XX

September xx, 1991 technical contact listed below or the appropriate Office of Nuclear Reactor

Regulation project manager.

Charles E. Rossi, Director

Division of Operational

Events Assessment

Office of Nuclear Reactor Regulation

Technical Contact:

Robert L. Dennig, NRR

(301) 504-1156 Attachment:

1. List of Recently Issued Information Notices

CONCTRRENCE:

OEAB W' TECH EDITOR BC: SPLU BC: OEKB BC: KCB

RWWoodruff irgaln Pl CEMcCracken AEChaffee GHMarcus

09 5/92 09/2,1/92 09/; f92 09/ /92 09/ /92 09/ /92 D: DOEA

CERossi

09/ /92

410.in


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