ML20057D786
| ML20057D786 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/29/1993 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-10, NUDOCS 9310050367 | |
| Download: ML20057D786 (3) | |
Text
l' 4
D ALTIMOftE GAS AND ELECTRIC 1650 CALVERT CLIFFS PARKWAY. LUSBY, MARYLAND 20657-4702 ROBERT E. DENTON September 29,1993 Vict Patsc[m nucle AR ENER0Y (4io) eco 44ss U. S. Nuclear Regulatory Commission Washington, DC 20555 A1TENTION:
Document Control Desk j
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2: Docket Nos. 50-317 & 50-318 Response to Generic Letter 89-10, Supplement 5, " Inaccuracy of Motor.
Operated Valve Diacnostic Eauipment"
REFERENCE:
(a)
Generic Letter 89-10, Supplement 5, " Inaccuracy of Motor-Operated Valve Diagnostic Equipment," dated June 28,1993 NRC Generic Letter 89-10, Supplement 5, discusses NRC staff concerns about the accuracy of various types of motor-operated valve (MOV) diagnostic equipment. On October 2,1992, the NRC was notified by Liberty Technologies that two new factors can affect the thrust values obtained with their Valve Operation Test and Evaluation System (VOTES) MOV diagnostic equipment.
Previously, the VOTES equipment derived thrust from yoke strain that had been calibrated to stem thrust using measured diametral strain of the valve stem and nominal engineering material properties. The new factors involve: 1) the possible use of improper stem material constants; and
- 2) the failure to account for a torque effect when the equipment is calibrated by measuring strain of the threaded portion of a valve stem.
The MOV program at Calvert Cliffs Unit 1 & 2 uses VOTES MOV diagnostic equipment.
Reference (a) requests that we re-examine our MOV program and identify measures taken to account for uncertainties in properly setting valve operating thrust. We understand that our response to the generic letter supplement will enable the NRC staff to verify that we are evaluating the new information (i.e., the Liberty Technologies, Inc. October 2,199210 CFR Part 21 report) on the accuracy of MOV diagnostic equipment.
Reportine Hequirements (1) liithin 90 days of receipt of this letter, all licensees are required to notify the NRC staff of the diagnostic equipment used to confirm the proper si:e, or to establish settings, for MOVs within the scope of GL 89-10.
Response
We have always used VOTES 100 System for MOV diagnostics. We are currently using VOTES version 2.3 software.
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Mthin 90 days of receipt of this letter, licensees are required to report whether they have taken actions orplan to take actions (including schedule and summary of actions taken orplanned)
)
to address the information on the accuracy ofMOVdiagnostic equipment.
Resixmse 1
All MOVs in the scope of GL 89-10 and tested using VOTES were re-evaluated based on both the information contained in the October 2,199210 CFR Part 21 report and VOTES Version J '. software. From our re-evaluation, we verided that these MOVs were always i
operab :
Should you have any further questions regarding this matter, we will be pleased to discuss them with
- you, t
Nsry truly yours, l
[
BTATE OF MARYLAND :
TO WIT :
COUNTY OF CALVERT I hereby certify that on the
[N dayof 6tp h m b,1993,/ ( b edt/
before me, the subscriber, f
a Notary Public nf the State of Maryland in hnd for (w/wr personally appeared Robert E. Denton, being duly sworn, and states that he is Vice Pfesident of the Baltimore Gas and Electric Company, a corporation of the State of Maryland; that he provides the foregoing response for the purposes therein set forth; that the statements made are true and correct to the best of his knowledge, information, and belief; and that he was authorized to provide the response on behalf of said Corporation.
WITNESS my Hand and NotarialSeah Y/[LC.
[I__.-
Notary Public e
l My Commission Expires:
h[u<ntu c7 /998 Date RED /JMO/jmo/dtm
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8-Document Control Desk September 29,1993 Page 3 cc:
D. A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. Mcdonald,.Tr., NRC T. T. Martin, NRC P. R. Wilson, NRC R. I. McLean, DNR J. H. Walter, PSC