ML20092F071
| ML20092F071 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 02/13/1992 |
| From: | Calhill W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-92 TXX-92094, NUDOCS 9202190070 | |
| Download: ML20092F071 (3) | |
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llll2lll" lll FE Log Il TXX-92094 l
File Il 10110 Ref. Il 10CfR 21.21 7UELEC7RIC February 13, 1992 William J. Cahill, Jr.
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v U. S. Nuclear Regulatory Commission Attn: Document Control Desk l
Washington, D.C.
20555 j
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) 1 DOCKET NOS. 50-445 AND 50-446 YOKE TO BONNEI BOLTING MATERIAL, COPES VULCAN VALVES 10CFR21 REPORT P21R-92-002 l
Gentlemen:
On January 16, 1991, TU Electric notified the NRC of'an issue regarding Copes Vulcan valves via facsimile. Although no substantial safety hazard exists at CPSES, TU Electric is reporting this issue to the NRC because it'could affect other facilities.
l Attached is the report which satisfies the reporting requirements of 10CFR21.
The report has been formatted in a manner that corresponds to the specific information requests by subparts (1) through (viii) of paragraph 21.21(c)(4) of the regulation. This is exclusive of-that portion of subpart-(vi) l regarding names and locations of other facilities which may be-affected, as this information-is not known to TU Electric with-the exception of the LicenseeEventReportsubmittedbyHaddam-Heck,-andsubpart(viii)inits-entirety regarding the advice that has been or will be given to other-.
l facilities.---Such advice would be dependent on the facility: specific.use-of
.the subject components.-
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A copy of this r e ort will be sent to Copes Vulcan and. Westinghouse.
I Sincerely.
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William J. Cahill, Jr.
JET /ds c - Mr. R. D.-Martin,-Region IV Resident Inspectors, CPSES (2)
Copes Vulcan, Inc.
Westinghouse, Inc.
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Attachment to TXX-92094 Page 1 of 2 10CFR21 Issue Involving Yoke to Bonnet Bolting Material, Copes Vulcan Valves (1)
Information Supplied by:
William J. Cahill, Jr.
TU Electric 400 North Olive Street, LB01 Dallas, Texas 75201 (ii) The facility is the Comanche Peak Steam Electric Station (CPSES) Unit 1 and 2.
The basic component is a S/8" cap screw securing the valve yoke to the valve bonnet on Copes Vulcan Valves.
(iii) The valves containing the cap screws were supplied to CPSES by Westinghouse. Westinghouse purchased the valves from the valve manufacturer, Copes Vulcan.
(iv) Description The bolting material in question is 5/8" socket head cap screws, 1 1/8" 1cng, 11 UNC, used to attsch the valva yoke to the valve bonnet. The bolting ;aaterial is identified on Copes Vulcan drawings as A193 B6 naterial. This is typical for all valve sizes supplied to CPSES.
S_ite_ Specific Summary On November 11, 1991, during Unit 2 construction activities it was discovered that the wrong bolting material was present on a Copes Vulcan valve.
Unlike the material specified on the vendor drceings, ASTM A193 B6, the installed material was not ferromagnetic.
Subsequent examinations of other valves, in Unit 1 and Unit 2, confirmed the wrong bolting material had been installed in the majority of Copes Vulcan valves supplied to Comanche Peak.
Testing of the bolts removed from Unit 2 identified material compo<,ition and properties associated with ASTH material specification F337 type XH7.
Site S.pecific Safety Implications No safety implications exist at CPSES as a result of the wrong bolting material being installed.
A determination that the deficiency did not affect Unit 1 operability was made by comparison of the calculated stresses associated with the material present. A subsequent evaluation for Unit 2 showed that the bolts would not yield ir, such a manner as to effect valve function.
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- Attachment to TXX-92094 Page 2 of 2 Although these condition have been deterrined to present no significant safety consideration es CPSES, due to the specific application of valves using this material and conservatism of design, the deviation is being reported to assure notifict lon to other possibly affected nuclear facilities.
(v)
Based on the determination that the valves in question would remain functional, it has been determined that the deficiency is not a defect under 10CFR21.
(vi) TU Electric has 150 Copes Vulcan valves in Units 1 and 2, most of which are in safety related applications.
(vii) TU Electric will replace the non-conforming bolting material in 'Jnit I prior to the end of the second refooling outage. The Unit 2 bolt;ng material will be replaced prior to fuel load.
(viii)Not Applicable t
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