United States Nuclear Regulatory Commission - Protecting People and the Environment

Information Notice No. 90-17: Weight and Center of Gravity Discrepancies for Copes-Vulcan Valves

                                UNITED STATES
                        NUCLEAR REGULATORY COMMISSION
                    OFFICE OF NUCLEAR REACTOR REGULATION
                           WASHINGTON, D.C.  20555

                                March 8, 1990


Information Notice No. 90-17:  WEIGHT AND center OF GRAVITY 
                                   DISCREPANCIES FOR COPES-VULCAN VALVES


Addressees: 

All holders of operating licenses or construction permits for nuclear power 
reactors. 

Purpose: 

This information notice provides additional information which was compiled 
by a joint Westinghouse and Copes-Vulcan effort in mid-late 1989 regarding 
the incorrect weight and center of gravity data provided on Copes-Vulcan 
valve assembly drawings that could have been provided to licensees by any 
NSSS supplier or AE firm in the 1970 - 1980 time period.  It is expected 
that recipients will review this information for applicability to their 
facilities and consider actions, as appropriate.  However, suggestions 
contained in this information notice do not constitute NRC requirements; 
therefore, no specific action or written response is required. 

Description of Circumstances: 

As discussed in Information Notice 89-28, "Weight and Center of Gravity 
Discrepancies for Copes-Vulcan Air-Operated Valves," significant 
discrepancies were discovered in valve weight and center of gravity 
information for small bore air-operated valves supplied by Copes-Vulcan.  
Recent information obtained during NRC staff inspections at Westinghouse and 
Copes-Vulcan also identified additional weight and center of gravity 
discrepancies in large bore valves ranging in size up to 16-inches which 
include air-operated valves, motor-operated valves and check valves.  

Westinghouse Electric Corporation and Copes-Vulcan prepared an extensive set 
of revised valve drawings showing the corrected weights and centers of 
gravity.  Westinghouse compiled these drawings into two valve lists, dated 
July 17 and August 14, 1989, that represented a complete set of correct 
weights and centers of gravity as was then currently known to them.  
However, these valves represented only a portion of the total population of 
valves that Westinghouse had supplied to various licensees.  Consequently, 
pending an in-depth review of all Copes-Vulcan valve drawings and the 
confirmation of their applicability to Westinghouse-supplied valves, these 
lists cannot be considered final.  We have condensed the information 
provided by Westinghouse into Tables 1 and 2, 




9003020211 
.

                                                            IN 90-17
                                                            March 8, 1990
                                                            Page 2 of 3


which are attached.  These tables provide a brief description of the type 
and class of the valves most significantly affected by these corrections; 
grouped by weight increases and center of gravity increases, respectively. 

In the information provided by Westinghouse and Copes-Vulcan approximately 
16 models of Copes-Vulcan valves were noted as having weight increases 
greater than 25 percent.  The largest individual increase was 1710 pounds on 
a 16-inch, Class 900, air-operated feedwater valve.  This represented an 
increase of 83 percent in the weight originally given for the valve.  Other 
notable weight increases included a 515-pound weight increase for a 10-inch, 
Class 600, air-operated modulating valve; a 180-pound weight increase for an 
8-inch, Class 150, motor-operated gate valve; and a 107-pound weight 
increase for a 2-inch, Class 1500, air-operated modulating valve. 

The center of gravity discrepancies appear to be far more extensive than the 
weight discrepancies.  Approximately 32 models of Copes-Vulcan valves were 
noted as having potentially significant discrepancies of this type.  In some 
cases, the center of gravity information was not originally supplied along 
with the valve.  In those instances piping design analyses were typically 
performed using conservative estimates.  However, in a large number of cases 
the original information provided with the valves was nonconservative by 
more than 20 percent.  In the worst case, the center of gravity on a 1-inch, 
Class 600, air-operated isolation valve changed by 15 inches.  Other notable 
center of gravity changes included a 16-inch change (from 7-inches to 
23-inches relative to the original datum point) on a 3-inch, Class 150, 
air-operated isolation valve; a 6-inch change on a 10-inch, Class 150, 
manual gate valve; and a 5+-inch change on a 2-inch, Class 1500, 
motor-operated modulating valve.  

The staff has no reason to believe that these weight and center of gravity 
discrepancies are unique to Westinghouse plants.  On the contrary, an NRC 
inspection of Copes-Vulcan on November 7 - 11, 1988 (NRC Report 
99900080/88-01 with discussion in IN 89-28) identified 29 non-Westinghouse 
nuclear power plants in addition to Westinghouse plants that were supplied 
the incorrect valve weight and center of gravity information.  A list of 
these plants is given in Table 3.  

Discussion: 

Several licensees have reanalyzed the associated piping systems using the 
corrected small bore valve weight and center of gravity information.  These 
piping systems had originally been designed using either detailed finite 
element analyses or "cookbook" span criteria.  The initial reanalysis work 
was typically based on the standard response-spectrum-type methodology 
consistent with the normal analytical methods used during the original 
design.  The results of these initial reanalyses disclosed instances where 
the calculated stress would exceed 100,000 psi during a design-basis 
earthquake.  In all cases the acceptability of the installation was 
confirmed, but in several cases this required the use of more sophisticated 
time history type analyses with NRC-approved increases in allowable 
stresses.  In addition, some modifications to the seismic support 
configurations were required in order to bring the installations within the 
allowable FSAR stress criteria.  

.

                                                            IN 90-17
                                                            March 8, 1990
                                                            Page 3 of 3


It is important to note that previous revisions to the weight and center of 
gravity information have been provided.  Therefore, in deciding if a 
reanalysis of a valve and piping configuration would be appropriate, a 
comparison of the latest corrected information to the information either 
originally supplied with the subject valves or assumed in the original 
design analysis or analyses performed in response to IE Bulletin 79-14 
("Seismic Analyses for As-Built Safety-Related Piping Systems,") would be 
appropriate.  Also, it is important to note that many of the Copes-Vulcan 
applications identified in Table 3 are located in safety-related systems.

This information notice requires no specific action or written response.  If 
you have any questions about the information in this notice, please contact 
one of the technical contacts listed below or the appropriate NRR project 
manager.  




                              Charles E. Rossi, Director 
                              Division of Operational Events Assessment 
                              Office of Nuclear Reactor Regulation 

Technical Contacts:  J. A. Gavula, RIII
                     (708) 790-5761

                     J. J. Petrosino, NRR
                     (301) 492-0979


Attachments:  
1.  Table 1 - C-V Valves with Weight Increases 
      Greater than 25%
2.  Table 2 - C-V Valves with Center of Gravity 
      Increases Greater than 20%
3.  Table 3 - List of Plants Supplied with Copes-Vulcan 
      Valves with Type of Valve and System Application.
4.  List of Recently Issued NRC Information Notices 
.

                                                            Attachment 1
                                                            IN 90-17
                                                            March 8, 1990
                                                            Page 1 of 1


                                   TABLE 1

              C-V Valves With Weight Increases Greater Than 25%


Size           Class               Description

3/8"           1500 lb             air-operated globe valve
3/4"           1500 lb             air-operated isolation valve
1"             1500 lb             air-operated isolation valve
2"             1500 lb             motor-operated modulating valve
2"             1500 lb             air-operated isolation valve
2"              600 lb             air-operated isolation valve
2"              300 lb             motor-operated modulating valve
3"             1500 lb             air-operated isolation valve
3"              300 lb             air-operated modulating valve
3"              150 lb             air-operated isolation valve
3"              150 lb             air-operated modulating valve
8"              150 lb             motor-operated gate valve 
12"            (N/A)               flow control valve 
14"             900 lb             air-operated feedwater valve
16"             600 lb             air-operated feedwater valve
16"             900 lb             air-operated feedwater valve
.

                                                            Attachment 2
                                                            IN 90-17
                                                            March 8, 1990
                                                            Page 1 of 1


                                   TABLE 2

        C-V Valves With Center of Gravity Increases Greater Than 20%


Size           Class               Description

3/8"           1500 lb             air-operated globe valve
3/4"           1500 lb             air-operated isolation valve
3/4"            600 lb             air-operated isolation valve
3/4"            150 lb             air-operated 3-way valve
1"             1500 lb             air-operated isolation valve
1"              600 lb             air-operated isolation valve
1"              150 lb             air-operated 3-way valve
2"             1500 lb             air-operated modulating valve
2"              600 lb             air-operated modulating valve 
2"              150 lb             air-operated modulating valve
2"              150 lb             air-operated 3-way valve
3"             1500 lb             air-operated modulating valve
3"              600 lb             air-operated isolation valve
3"              300 lb             air-operated isolation valve
3"              300 lb             air-operated 3-way valve
3"              300 lb             check valve
3"              150 lb             air-operated 3-way valve
3"              150 lb             check valve
4"              300 lb             air-operated 3-way valve
4"              150 lb             check valve 
4"              150 lb             gate valve
4"              150 lb             air-operated isolation valve
6"              150 lb             gate valve
8"              150 lb             check valve
10"             150 lb             gate valve
10"             150 lb             check valve
10"             300 lb             gate valve
10"             300 lb             check valve
12"             300 lb             check valve
12"             150 lb             check valve
14"             300 lb             check valve
16"             150 lb             check valve
.

                                                            Attachment 3
                                                            IN 90-17
                                                            March 8, 1990
                                                            Page 1 of 2


                                   TABLE 3

    List of plants supplied with Copes-Vulcan valves with type of valve 
    and system application.  This table is based on information obtained 
                        from CV's "valve user list".


Plant                              Known Valve Application

Beaver Valley 1                    FW, AO, MO, SV, BOP
Beaver Valley 2                    FW, AO, SV, BOP
Bellefonte                         FW
Braidwood 1 & 2                    AO, MO, SV, MT, SD, BOP
Browns Ferry 1                     BOP
Byron 1 & 2                        AO, MO, SV, MT, BOP
Callaway                           FW, AO, FWB, BOP
Calvert Cliffs 1 & 2               SD, BOP
Comanche Peak 1 & 2                FW, AO, SV, BOP
Cook 1 & 2                         AO, BOP
Crystal River 3                    BOP
Davis-Besse                        BOP
Diablo Canyon 1 & 2                FW, AO, SD, BOP
Dresden 2 & 3                      FW, BOP
Farley 1 & 2                       AO, BOP
Fort Calhoun                       BOP
Ginna                              FW, AO, BOP
Harris                             FW, AO, SV, BOP
Indian Point 2 & 3                 FW, AO, BOP
Kewaunee                           FW, SD
Limerick 1 & 2                     BOP
Maine Yankee                       FW, BOP
McGuire 1 & 2                      Specific Application Unknown
Millstone 1, 2 & 3                 FW, BOP
Monticello                         FW
Nine Mile Point 1                  FW, BOP
Nine Mile Point 2                  FW, BOP
North Anna 1 & 2                   FW, AO, SD, BOP
Palisades                          FW, BOP
Perry                              FW, BOP
Pilgrim                            FW
Point Beach 1 & 2                  FW, AO, BOP, FWB
.

                                                            Attachment 3
                                                            IN 90-17
                                                            March 8, 1990
                                                            Page 2 of 2


                             TABLE 3 (continued)


Plant                              Known Valve Application

Prairie Island 1 & 2               FW, AO, BOP
Quad Cities 1 & 2                  FW, BOP
River Bend 1                       FW, BOP
Robinson 2                         FW, AO, FWB, BOP
Salem 1 & 2                        FW, AO, BOP
San Onofre 2 & 3                   FW
Seabrook                           FW, AO, SV, BOP
Sequoyah 1 & 2                     FW, AO, BOP
Shoreham                           BOP
South Texas 1 & 2                  FW, AO, FWB
St. Lucie 1                        FW, BOP
St. Lucie 2                        Specific Application Unknown
Summer 1                           AO, BOP
Surry 1 & 2                        FW, AO, SD, BOP
Susquehanna                        BOP
Trojan                             AO, SD, BOP
Turkey Point 3 & 4                 FW, AO, FWB, BOP
Vogtle 1 & 2                       MO, AO, SV, BOP
Watts Bar                          SV, AO, SD, BOP
Wolf Creek                         FW, AO, FWB, BOP
Zion 1 & 2                         AO, BOP




Acronyms

FW - Feedwater Valve               SV - Sampling Valve
AO - Air-Operated Valve            MT - Manual Throttling
MO - Motor-Operated Valve          SD - Steam Dump
FWB - Feedwater Bypass Valve       BOP - Balance of Plant
.ENDEND
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