ML20044B846
| ML20044B846 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Palo Verde, Indian Point, Wolf Creek, Oyster Creek, Columbia, Haddam Neck, Clinton, Crane File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 03/04/1993 |
| From: | Taylor J BABCOCK & WILCOX CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-93 JHT-93-63, NUDOCS 9303100268 | |
| Download: ML20044B846 (8) | |
Text
BW BGWNUCLEAR TECHNOLOGIES 2315 Old Forest Road P.O. Box 10935 Lynchburg, VA 24506-0935 Teleptione: 804-385-2OOD March 4, 1993 retecopy: Bo4-385-3663 JHT/93-63 Document Control Desk U.S.
Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Potential Safety Issue Regarding Motor Operated Valve Evaluation Software Program Gentlemen:
The purpose of this letter is to advise you of a concern regarding a Motor Operated Valve Evaluation Software Program (MOVE) that may have safety implications.
Version 3.1 of the MOVE program, developed by B&W Nuclear Technologies, contains an error that could possibly result in a motor operated valve being set up to a Max Total Thrust setting which exceeds the operator torque limits.
There is the potential that with such settings, the valve operator could be damaged, resulting in the inability of a valve to perform as required.-
The MOVE program " stores motor operated valve-information 5in databases and evaluates valve, operator and motor combinations against expected operating conditions.
The main function of the MOVE program is to evaluate the adequacy of a motor operated valve to open and close against the maximum ' postulated operating differential pressure.
Based on the results of the MOVE analysis, utilities may establish and revise valve operator torque and thrust settings.
BWNT supplies the MOVE program to utilities for their use in evaluating their motor operated valves and operators.
It is also used by BWNT to evaluate valves and operators for utilities.
In November 1992, BWNT was advised by Northeast Utilities that' they had discovered a problem with version 3.1 of the MOVE sof tware' and r
its use of the Total Thrust (TT) multiplier, which is used to increase the torque rating of the operator. Northeast Utilities is one of the utilities that had procured the MOVE software from BWNT.
The problem identified-in the MOVE program concerns. its use of: the Total Thrust multiplier.
If.the' operator torque rating _is more limiting than the operator thrust rating,. MOVE increases the operator torque rating by the operator thrust rating _ multiplier instead of the operator torque rating multiplier.
This error can possibly result in a motor operated valve being set up to a Max Total Thrust setting which exceeds the operator torque limits, not h I 9303100268 930304 i
PDR ADOCK 05000213 l
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PDR 1
-a,
' thrust limits.
MOVE will incorrectly increase the' operator torque rating only if certain conditions exist. Additional description of the concern and the recommendations to the affected utilities on how to use MOVE to correctly perform an evaluation are included in the attached Customer Service Bulletin No. 92-06 which was sent to the affected utilities January 11 and 12,.1993.
l The utilities affected are those to whom BWNT supplied the MOVE Version 3.1 software.
For certain of these utilities, BWNT has
- used, or is using, the MOVE program to analyze their valve operators.
The concern does not involve Version 3.0 of the MOVE program, which was supplied to one utility (not inclu @d below).
t The utilities to whom BWNT supplied the MOVE Version 3.1 software are as follows:
L Arizona Public Service Co. (Palo Verse 1, 2 & 3)
Consolidated Edison Company (Indian Point 2)
GPU Nuclear Corporation (TMI-1 and Oyster Creek 1)
Illinois Power Company (Clinton)
Northeast Utilities (Millstone 1,2, & 3 and Connecticut Yankee)
New York Power Authority (Indian Point Unit 3)
Washington Public Power Supply System (WNP-2) i Wolf Creek Nuclear Operating Corp. (Wolf Creek) i Following is the present utilization status of MOVE Version 3.1 at these plants:
i a.
To BWNT's knowledge, Arizona Public Service and Wolf l
Creek have not yet used MOVE.
l b.
GPUN, Illinois Power and WPPSS are performing or have performed calculations using MOVE.
j c.
BWNT has performed, or is presently performing calculations using MOVE for Consolidated
- Edison, Northeast Utilities and New York Power Authority.
To BWNS'c knowledge, these utilities have not yet performed calculations using MOVE themselves.
BWNT has determined that the error has no impact on the calculations it performed for these utilities.
Evaluation With respect to the MOV evaluations performed by BWNT for cert.ain utilities, BWNT has determined that the error has no impact on the i
calculations, and that there is therefore no safety concern.
"WNT is unable to determine if the error in Version 3.1 of the MOVE program would result in a substantial safety hazard reportable under 10CFR21 for the plants to whom MOVE was supplied for the i
following reasons:
~
- = -
o If the utilities have opted to develop their own target thrust windows the error identified in MOVE will have no l
impact on their valve settings.
BWNT has no knowledge as i
to whether the utilities have developed and will utilize their own target thrust windows.
e If utilities have performed their own calculations using l
n MOVE and increased the operator ratings such that the t
error would affect the target thrust
- window, the i
utilities then must evaluate the actual diagnostic test results against the proposed window generated in the MOVE report to determine if valve settings are I
l nonconservative.
BWNS has no knowledge of the specific l
valves evaluated by utilities, no knowledge of the diagnostic test results of the-valves analyzed, and no 4
knowledge of whether MOVE results would have resulted in l
nonconservative settings for those valves.
o BWNT has no knowledge of the valves analyzed by the utilities using MOVE, and therefore of their safety related function and safety impact ' of the plant if a valve were to fail to operate as required to perform its safety related function.
The utilities have been advised of the problem and of the recommended corrective action in Customer Service Bulletin No. 92-06.
BWNT will further advise these utilities that we are unable to complete an evaluation for reportability and are transferring the concern to them for their evaluation.
BWNT plans no ~further i
evaluation for reportability under 10CFR21 unless requested and I
authorized by the utilities.
This informational letter to the NRC is not a notification under
.j
'10CFR21.
1 Please contact the undersigned at (804) 385-2852 if you have any questions concerning this matter, or you may cc act Mr. David Mars at (804) 385-2852.
l Ve truly yours, r
Air,,
J.
H. Taylu Manager, Licensing Services JHT/DM i
l 1
l
L.
cc:
(w/o. attachment)
Supervisor,.DDC Arizona Public Service Co.
Consolidated Edison Co.
Mr..Jeff Lomm Mr. Jim Correa GPU Nuclear Corp.
Illinois Power Co.
Mr. Ted Danley Northeast Utilities Service Co.
Mr. J. T. Dimarzo New York Power Authority Mr. Fred Martsen Washington Public Power Supply System Records Control Anita Edwards, DC Wolf Creek Nuclear Operating Corp.
4 i
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BWNT 20555C-2 (7/901 i
CUSTOMER SERVICE BULLETIN TRANSMITTAL t
TO: Customer Service' Bulletin Coordinator Bulletin
Subject:
Error in Version 3.1 of the Motor Operated Valve Evaluation (MOVE)
Software Program 5
Attached is a Customer Service Bulletin for processing.
( JUk
. 0)dlGM_
/2- /7-9fs Prepareb Date '
j
/ Z - / 7 - 9 2.
Approval Date
References:
t Recommended internal Distribution:
G. A.
Caul J.
S.
Hager P.
E.
Linn II A.
D.
McKim E.
A.
Malone K.
S.
Moon
BWNT 20555A-2 (7/90) -,
CUSTOMER SERVICE BULLETilV No.
99-nc Date 19-in-99 Subject Fernr in Vnve. inn
,1 nf t-h n Mnt nr nnovat orl Univo Fun 1 n n t i on
[MnVP\\ nnf t tanro PrntJrnn-Applicable Plants Ann clinenn ennn vnnvno 10-9, Tv-,
corr usi3cennn,_
c pply cycenn 9-,
unir crnov u
Plants advised for information only:
Purpose:
Advise utility customers of an error found in Version 3.1 of the MOVE software.
==
Description:==
See Attached.
Recommendations:
See Attached.
Attachments:
Yes.
BWNS
Contact:
Ed Malone - (804) 832-3526 1
Page of USHIB&WNUCLEAR MW TECHNOLOGIES l
Lynchbury Virginia 24506-0935 * [8041385-2000 i
3315DldForestRoad
- P.O. Box 10935
- l BWNT 20555B-2 (7/90)
Page 2
Of 3 ATTACHMENT CUSTOMER SERVICE BULLETIN NO. 92-06 Description NUSCO recently identified a problem with Version 3.1 of the MOVE software and its use of the Total Thrust (TT) multiplier, which is
{
used to increase the torque rating of the operator.
If the operator torque rating is more limiting than the operator thrust rating, MOVE increases the operator torque rating by the operator thrust rating multiplier instead of the operator torque rating multiplier.
This error can possibly result in an MOV being set up to a Max TT setting which exceeds the operator torque limits, not thrust limits.
v Our investigation of this problem indicates that MOVE will incorrectly increase the operator torque rating if and only if the following conditions exist:
(1)
MOV ovaloation was performed with Vers on 3.1 of the MOVE program.
MOVE Version 3.1 was released in November 1991.
(2)
The operator Torque Rating is more limiting than the operator Thrust Rating.
(3)
The Thrust rating and Torque rating multipliers at TT are not equal.
This error is usually encountered when the user incorporates increased operator ratings from industry studies.
It should be noted that this error will not occur if the standard defaults in MOVE are not over-ridden.
BWNS has performed a review to determine the impact of this error on calculations that we have performed for utilities.
The result of the review indicated that none of the calculations BWNS performed for utilities were affected since standard defaults were used.
BWNS is currently evaluating this concern
'or 10 CFR Part 21 applicability.
l Recommendations (A)
Feview Calculations Uti~
- ies should review the MOVE calculations that they have perrormed to see if this error has any impact on their Max TT values, as indicated by the target thrust wir.$ow.
CUSTOMER SERVICE BULLETIN - Continuation Sheet
BWNT.?05%B 2 (7/90)
Page "3
of 3 (13)
Continued use of MOVE Version 3.1 If the user wants to use increased operator ratings to evaluate an MOV, an evaluation can be performed correctly with Version 3.1 of the MOVE program by following the following steps:
(1)
Evaluate the MOV using standard TT Thrust and TT Torque multipliers.
(2)
Review the evaluation screen to see if the operator torque rating is more limiting than the operator thrust rating.
(3)
If the operator torque rating is more limiting, input the desired torque multiplier as the TT Thrust Multiplier.
This will increase the operator torque rating correctly.
(4)
If the operator thrust rating is more limiting, input the desired thrust multiplier as the TT Thrust Multiplier.
It should be noted that Version 4.0 of the MOVE program will correct this problem.
t CUSTOMER SERl/ ICE BULLETIN - Continuation Sheet
_