ML19322E820: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
 
(Created page by program invented by StriderTol)
Line 18: Line 18:
=Text=
=Text=
{{#Wiki_filter:.
{{#Wiki_filter:.
          '
  .  . .  -
              *
      ,
O ATTACHMENT I
O ATTACHMENT I
;
;
Line 27: Line 23:
: 2. Identification of Basic Component Mechanical Shock Arrestor Assemblies as supplied by Bergen-Patterson Pipe Support Corporation.
: 2. Identification of Basic Component Mechanical Shock Arrestor Assemblies as supplied by Bergen-Patterson Pipe Support Corporation.
: 3. Identification of Firm Supplying Component Bergen-Patterson Pipe Support Corporation 48 Winnisquam Avenue Laconia, NH 03246
: 3. Identification of Firm Supplying Component Bergen-Patterson Pipe Support Corporation 48 Winnisquam Avenue Laconia, NH 03246
                                                                                      .
: 4. Nature of Defect and Description of Substantial Safety Hazard Bergen-Patterson (B-P), through Southwest Fabricating and Welding Company, and NRC IEC 79-25 (to include Supplement A) has identified three (3) potential problems (A, B, & C below) with B-P Part No.
: 4. Nature of Defect and Description of Substantial Safety Hazard Bergen-Patterson (B-P), through Southwest Fabricating and Welding Company, and NRC IEC 79-25 (to include Supplement A) has identified three (3) potential problems (A, B, & C below) with B-P Part No.
2540 Strut Assembly used in conjunction with Pacific Scientific Mechanical Shock Arrestors.
2540 Strut Assembly used in conjunction with Pacific Scientific Mechanical Shock Arrestors.
A. In the larger sizes (15, 50 and 120), an installation interference between the mechanical arrestors and rear brackets has been encountered. This problem was addressed to B-P thru Nonconformance Notices, and was resolved by B-P with no substantial reduction of the designed load of these rear brackets.
A. In the larger sizes (15, 50 and 120), an installation interference between the mechanical arrestors and rear brackets has been encountered. This problem was addressed to B-P thru Nonconformance Notices, and was resolved by B-P with no substantial reduction of the designed load of these rear brackets.
B. Two larger sizes (50 and 120) are affected by the following problem:
B. Two larger sizes (50 and 120) are affected by the following problem:
                                                                                          ''
If the threaded portion of the B-P strut extension which mates with the Pacific Scientific Shock Arrestor is improperly installed, due to improper installation instructions, it could exert pressure on the rear dust cover of the snubber. Any distortion of the dust cover might allow foreign material to enter the 's nubber, potentially restricting free covement.
If the threaded portion of the B-P strut extension which mates with the Pacific Scientific Shock Arrestor is improperly installed, due to improper installation instructions, it could exert pressure on the rear dust cover of the snubber. Any distortion of the dust cover might allow foreign material to enter the 's nubber, potentially restricting free covement.
Extreme distortion can exert pressure on the internal mechanism creating resistance to free movement. Restriction to the designed free movement of the snubbers could possibly lead to failure of the design function, as identified by B-P. These specified snubbers are located in the Turbine Building, and failure would not cause a system interaction which would result in a substantial safety hazard.
Extreme distortion can exert pressure on the internal mechanism creating resistance to free movement. Restriction to the designed free movement of the snubbers could possibly lead to failure of the design function, as identified by B-P. These specified snubbers are located in the Turbine Building, and failure would not cause a system interaction which would result in a substantial safety hazard.
                                                              .
h* ' D &
h* ' D &
l l                    ..    .. __
l l                    ..    .. __
800402.0 )
800402.0 )


        ,
  ,        ,
      *
            ,
  '
              .
    ,
C. An additional problem, as identified by B-P and NRC IEC 79-25, Supplement A, involved the 2540-120 Shock Arrestor Strut Assemblies which fail to meet the designed load of 120,000 lbs. Through B-P testing, these assemblies have a maximum acceptable load of only 112,000 lbs.
C. An additional problem, as identified by B-P and NRC IEC 79-25, Supplement A, involved the 2540-120 Shock Arrestor Strut Assemblies which fail to meet the designed load of 120,000 lbs. Through B-P testing, these assemblies have a maximum acceptable load of only 112,000 lbs.
SCE6G's investigation revealed that only one (1) of the three to be used at V. C. Summer Station would be loaded in excess of 112,000 lbs. (MSH-058), and could, therefore, possibly affect the ability of the plant to safely shutdown.
SCE6G's investigation revealed that only one (1) of the three to be used at V. C. Summer Station would be loaded in excess of 112,000 lbs. (MSH-058), and could, therefore, possibly affect the ability of the plant to safely shutdown.
Line 62: Line 48:
: 6. Number and Location of Defects Referenced Problem A Three (3) Shock Arrestor Assemblies are on the Reactor Coolant System (RCH-057, -066, -082) and are installed in Non-Safety sections of the system in the Reactor Building.
: 6. Number and Location of Defects Referenced Problem A Three (3) Shock Arrestor Assemblies are on the Reactor Coolant System (RCH-057, -066, -082) and are installed in Non-Safety sections of the system in the Reactor Building.
Two (2) Shock Arrestor Assemblies are on the Safety Related Component Cooling System (CCH-025, -143) and are located in the Auxiliary Building.
Two (2) Shock Arrestor Assemblies are on the Safety Related Component Cooling System (CCH-025, -143) and are located in the Auxiliary Building.
                                                                                                      !
Two (2) Shock Arrestor Assemblies are on the Safety Related Reactor Building        l Spray System (SPH-088, -089) and are located in the Auxiliary Building.
Two (2) Shock Arrestor Assemblies are on the Safety Related Reactor Building        l Spray System (SPH-088, -089) and are located in the Auxiliary Building.
                                                                                              -
                              %
[                                                                                      n
[                                                                                      n


___  _                  _      _
e        .
e        .
    . .  .      .
                      ,
            -
                        .
              ,
One (1) Shock Arrestor Assembly is on the Safety Related Safety Injection System (Sill-209) and is located in the Reactor Building.
One (1) Shock Arrestor Assembly is on the Safety Related Safety Injection System (Sill-209) and is located in the Reactor Building.
One (1) Shock Arrestor Assembly is on the Safety Related Feedwater System (FWit-il9) and is located in the Reactor Building.
One (1) Shock Arrestor Assembly is on the Safety Related Feedwater System (FWit-il9) and is located in the Reactor Building.
Two (2) Shock Arrestor Assemblies are on the Safety Related Residual lleat Removal System (Rlill-185. -282) and are located in the Heactor Building.
Two (2) Shock Arrestor Assemblies are on the Safety Related Residual lleat Removal System (Rlill-185. -282) and are located in the Heactor Building.
One (1) Shock Arrestor Assembly is on the Safety Related Main Steam System (MSit-095) and is located in the Intermediate Building.
One (1) Shock Arrestor Assembly is on the Safety Related Main Steam System (MSit-095) and is located in the Intermediate Building.
Reference Problem B
Reference Problem B Four (4) Shock Arrestor Assemblies are on the Non-Safety Reheat Steam System (RSil-019, -025, -031, -038) and are located in the Turbine Building.
                                                                                                      .
Four (4) Shock Arrestor Assemblies are on the Non-Safety Reheat Steam System (RSil-019, -025, -031, -038) and are located in the Turbine Building.
Reference Problem C Three (3) Shock Arrestor Assemblies of this size (120) are to be used and all are on the Safety Related Main Steam System.
Reference Problem C Three (3) Shock Arrestor Assemblies of this size (120) are to be used and all are on the Safety Related Main Steam System.
Two of the Assemblies (MSit-092 & MSii-102) are located in the Intermediate Building and one assembly (MSli-058) is located in the Auxiliary Building on Main Steam Loop A.
Two of the Assemblies (MSit-092 & MSii-102) are located in the Intermediate Building and one assembly (MSli-058) is located in the Auxiliary Building on Main Steam Loop A.
: 7.      Corrective Action
: 7.      Corrective Action
* f Referenced Problem A The larger size assemblies (120) are in the process of being replaced by B-P. The smaller sizen have been modified.
* f Referenced Problem A The larger size assemblies (120) are in the process of being replaced by B-P. The smaller sizen have been modified.
Referenced Problem B
Referenced Problem B Each identified assembly has been visually examined to determine if any distortion of the rear dust cover is evident. In addition, each unit has been manually stroked throughout its entire range of travel to verify free movements. B-P has now supplied parts to prevent distortion.
        ,
  .
Each identified assembly has been visually examined to determine if any distortion of the rear dust cover is evident. In addition, each unit has been manually stroked throughout its entire range of travel to verify free movements. B-P has now supplied parts to prevent distortion.
I Referenced Problem C The Main Steam System for the three (3) assemblies have been analyzed and has been determined that only one (1) assembly could be overloaded (MSii-058). The bracket of the assembly, which is the overloaded component, will be re-designed and supplied by B-P.
I Referenced Problem C The Main Steam System for the three (3) assemblies have been analyzed and has been determined that only one (1) assembly could be overloaded (MSii-058). The bracket of the assembly, which is the overloaded component, will be re-designed and supplied by B-P.
: 8.          Advice      ,
: 8.          Advice      ,
None
None
                                                  .
                                             -_        _ _ _ _                  ,        _        ' _  ,_}}
                                             -_        _ _ _ _                  ,        _        ' _  ,_}}

Revision as of 03:46, 1 February 2020

Deficiency Rept Re Problems Identified in Bergen-Patterson Part 2540 Strut Assembly Used W/Pacific Scientific Mechanical Shock Arrestors.Cause Unstated.Larger Assemblies Being Replaced.Smaller Assemblies Modified
ML19322E820
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 03/10/1980
From:
SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML19322E819 List:
References
NUDOCS 8004020322
Download: ML19322E820 (3)
v • d • e


Text

.

O ATTACHMENT I

1. Name of Reporting Individual Fred B. Brabham - P. O. Box 764, Columbia, SC' 29218
2. Identification of Basic Component Mechanical Shock Arrestor Assemblies as supplied by Bergen-Patterson Pipe Support Corporation.
3. Identification of Firm Supplying Component Bergen-Patterson Pipe Support Corporation 48 Winnisquam Avenue Laconia, NH 03246
4. Nature of Defect and Description of Substantial Safety Hazard Bergen-Patterson (B-P), through Southwest Fabricating and Welding Company, and NRC IEC 79-25 (to include Supplement A) has identified three (3) potential problems (A, B, & C below) with B-P Part No.

2540 Strut Assembly used in conjunction with Pacific Scientific Mechanical Shock Arrestors.

A. In the larger sizes (15, 50 and 120), an installation interference between the mechanical arrestors and rear brackets has been encountered. This problem was addressed to B-P thru Nonconformance Notices, and was resolved by B-P with no substantial reduction of the designed load of these rear brackets.

B. Two larger sizes (50 and 120) are affected by the following problem:

If the threaded portion of the B-P strut extension which mates with the Pacific Scientific Shock Arrestor is improperly installed, due to improper installation instructions, it could exert pressure on the rear dust cover of the snubber. Any distortion of the dust cover might allow foreign material to enter the 's nubber, potentially restricting free covement.

Extreme distortion can exert pressure on the internal mechanism creating resistance to free movement. Restriction to the designed free movement of the snubbers could possibly lead to failure of the design function, as identified by B-P. These specified snubbers are located in the Turbine Building, and failure would not cause a system interaction which would result in a substantial safety hazard.

h* ' D &

l l .. .. __

800402.0 )

C. An additional problem, as identified by B-P and NRC IEC 79-25, Supplement A, involved the 2540-120 Shock Arrestor Strut Assemblies which fail to meet the designed load of 120,000 lbs. Through B-P testing, these assemblies have a maximum acceptable load of only 112,000 lbs.

SCE6G's investigation revealed that only one (1) of the three to be used at V. C. Summer Station would be loaded in excess of 112,000 lbs. (MSH-058), and could, therefore, possibly affect the ability of the plant to safely shutdown.

5. Dates Information of Defects were Obtained January 2, 1980 - NRC IEC No. 79-25 .

February 4, 1980 - NRC IEC No. 79-25, Supplement A January 7, 1980 - Southwest Fabricating and Welding Company to GAI, dated January 3, 1980, with attached B-P letters:

B-P's letters to Southwest, CCN: 2863/32/0099, CCN: 2537/32/0100 and CCN: 2557/32/0101, all dated December 28, 1979.

September 25,1978 - NCN 505 (SIH-209) '

March 7, 1979 - NCN 650 (FWH-119)

April 18, 1979 - NCN 716 (RHH-185) Addressing rear bracket interferences July 19, 1979 - NCN 901 (MSH-102)

July 19, 1979 - NCN 902 (MSH-092)

July 19, 1979 - NCN 903 (MSH-058)

July 21, 1979 - NCN 906 (MSH-095)

August 14,1979 - NCN 940 (RHH-282)

October 18,1979 - NCN 1062 (Generic for all dust cover interferences)

6. Number and Location of Defects Referenced Problem A Three (3) Shock Arrestor Assemblies are on the Reactor Coolant System (RCH-057, -066, -082) and are installed in Non-Safety sections of the system in the Reactor Building.

Two (2) Shock Arrestor Assemblies are on the Safety Related Component Cooling System (CCH-025, -143) and are located in the Auxiliary Building.

Two (2) Shock Arrestor Assemblies are on the Safety Related Reactor Building l Spray System (SPH-088, -089) and are located in the Auxiliary Building.

[ n

e .

One (1) Shock Arrestor Assembly is on the Safety Related Safety Injection System (Sill-209) and is located in the Reactor Building.

One (1) Shock Arrestor Assembly is on the Safety Related Feedwater System (FWit-il9) and is located in the Reactor Building.

Two (2) Shock Arrestor Assemblies are on the Safety Related Residual lleat Removal System (Rlill-185. -282) and are located in the Heactor Building.

One (1) Shock Arrestor Assembly is on the Safety Related Main Steam System (MSit-095) and is located in the Intermediate Building.

Reference Problem B Four (4) Shock Arrestor Assemblies are on the Non-Safety Reheat Steam System (RSil-019, -025, -031, -038) and are located in the Turbine Building.

Reference Problem C Three (3) Shock Arrestor Assemblies of this size (120) are to be used and all are on the Safety Related Main Steam System.

Two of the Assemblies (MSit-092 & MSii-102) are located in the Intermediate Building and one assembly (MSli-058) is located in the Auxiliary Building on Main Steam Loop A.

7. Corrective Action
  • f Referenced Problem A The larger size assemblies (120) are in the process of being replaced by B-P. The smaller sizen have been modified.

Referenced Problem B Each identified assembly has been visually examined to determine if any distortion of the rear dust cover is evident. In addition, each unit has been manually stroked throughout its entire range of travel to verify free movements. B-P has now supplied parts to prevent distortion.

I Referenced Problem C The Main Steam System for the three (3) assemblies have been analyzed and has been determined that only one (1) assembly could be overloaded (MSii-058). The bracket of the assembly, which is the overloaded component, will be re-designed and supplied by B-P.

8. Advice ,

None

-_ _ _ _ _ , _ ' _ ,_

Retrieved from "https://kanterella.com/w/index.php?title=ML19322E820&oldid=2364413"