ML20038A742
| ML20038A742 | |
| Person / Time | |
|---|---|
| Issue date: | 10/14/1981 |
| From: | Morton K NRC OFFICE OF ADMINISTRATION (ADM) |
| To: | Lofy R PARAMETER, INC. |
| Shared Package | |
| ML20038A741 | List: |
| References | |
| CON-FIN-B-1013, CON-NRC-05-80-251, CON-NRC-5-80-251 NUDOCS 8111160320 | |
| Download: ML20038A742 (6) | |
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UNITED STATES E'
'k NUCLEAR REGULATORY COMMISSION
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OCT 14 19g; Parameter, Inc.
Attn: Mr. Richard A. Lofy, President 13380 Watertown Plank Road Elm Grove, ll! 53122 Gentlemen:
Subject:
Contract No. NRC-05-80-251, Task Order No. 17 Pursuant to the pertinent provisions of this contract, I hereby authorize the expenditure of funds in the amount of $8,000.00 to provide technical assistance in the metallurgical analysis of cracked studs removed from main steam isolation valves at D.
C'. Cook Unit 2 as outlined in the enclosed Task Order No.17.
If you believe that the total ceiling price is inadequate for the purposes of this Task Order, you must so notify me within ten (10) business days after its receipt.
This notification shall contain your estimate of the required total ceiling cost. Within ten (10) business days after receipt of such notification, the Contracting Officer shall either ratify the total ceiling cost or adopt the proposed revised estimate or some combination of the two and revise or confirm the Task Order accordingly.
This letter, executed on behalf of the Commission, is forwarded to you in quadruplicate.
Please acknowledge receipt on three (3) copies hereon and return them to me as soon as possible.
The forth copy is for your retention.
Sincerely, O
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/ oM kKeflogg V. Morton, Chief - /
Research Contracts Branch Division of Contracts Office of Administration
Enclosure:
Task Order No.17 (4 copies) 8111160320 811023 PDR CONTR NRC-05-80-251 PDR 1
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4 RECEIVED:
1 Parameter, Inc.
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Contract No. NRC-05-80-251 Task Order No.17 Analysis of Cracked Studs from D. C. Cook Unit 2 1.
Scope cf Work Provide NRC-IE assistance and services in the independent metallurgical analysis of cracked studs as outlined in the statement of work below.
===7.
Background===
American Electric Power Company reported to the NRC-IE that during the Spring 1981 refueling outage of D.C. Cook Unit 2, a visual examination of the main steam isolation valves disclosed some failures of the internal studs joining the disc guide and baffle plates in MSIV designated MRV-230.
Examination revealed six fractured studs with evidence of old fracture surfaces. Twenty-two of the remaining seventy-four :tuds broke while being removed. for replacement.
One stud from the six found in a fractured condition and one from the 22 that broke while being removed were provided to NRC-IE for an inde-pendent analysis of the failure mode and mechanism. These studs are of ASTM A-193, Grade B7 material and were originally, 7/8 in, dia x 3-1/2 in.
long.
3.
Statement of Work The actual laboratory analysis and evaluation shall consist of the followina:
(a)
Photograph the "as received" studs to document the physical condition and to provide references for the location of sections removed for analysis.
(b)
Perform optical examinations at. appropriate magnification of the
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fracture face to characterize the fracture and identify crack initiation sites; and of the stud surfaces to identify cracks or other discontinuities that may be present.
Document the examination results with representative photomicrographs.
(c)
Perform optical metallography of selected specimen sections con-taining cracks to determine if the cracking is trans or intergranular.
Provide an evaluation of the material structure to determine if the structure is representative for the material.
Provide repre-se tative photomicrographs which document the structure, cracking mode, and any anomalies observed.
(d)
Conduct scanning electron metallography (SEM) studies and EDAX analysis of the fracture surface (s).
If Turther detail is required to identify the mode of failure, supplement the SEM evaluation with TEM using replica techniques.
Provide an appropriately documented evaluation of the following:
Task Ord:r No. 17 2
(1)
Characterization of fracture surfaces - initiation sites, fracture morphology with respect to fatigue, stress corrosion.
stress overload, etc.
(2) Analysis of identified deposits on thread and crack surfaces, and qualitative correlation with chemical analysis of base material.
(e) Pt.rform hardness survey of crack areas and a standard hardness test to determine if mechanical properties of the bolt meets speci-fication.
(f) Perform quantitative chemical analysis of bolt by the most appro-priate method to suitably characterize the stud material and deter-mine conformance to specification limits.
4.
Report Requirements, Upon receipt of the bolt sample at the designated laboratory for analysis, the following reports are required:
(a)
Results of laboratory analysis and evaluation as the work progresses shall be verbally communicated to the IE Headquarters Project Officer on a weekly basis.
(b) A preliminary report on the complete analysis and evaluation shall be submitted within 20 days for the Project Officer's review.
(c)
Forty (copies) of a written fina'l report s!.all be submitted to the IE Project Officer within 45 days.
5.
Special Instructions The NRC will provide shipment of the stud samples to the designated laboratory for analysis.
Details of the valve design, design conditions and materials of construction will be transmitted to Parameter Inc. by registered mail. These details, designated drawing number F6977N/38 and attachments, contain " Proprietary Infonnation" under the provisions of 10 CFR Section 2.790 and are to be safeguarded in accordance with 10 CFR 2.903.
These documents are to be used solely for the submitted purpose and should not be discussed or made available to any person not requiring such information in the conduct of NRC-IE official business.
Parameters Inc. is to store, and handle, these documents in a manner to assure their contents are not made available to unauthorized persons and their return to NRC-IE upon completion of this task order.
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. Task Order No.17 3
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1 All unconsumed portions of the studs are to be properly identified and retained by the designated laboratory, or the contractor, for a period of three months or until advised by NRC-IE ileadquarters regarding dis-
-position.
6.
Pisces of Performance
-(a) Parameter, Inc.
(b) Technimet, Inc.
7.
Cost Ceiling
-$8,000 4
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o ATTACHMENT Valve Supplier: Atwood & Morrili Company Valve Manufacturer: Hopkinson Limited, Huddersfield, G. B.
Valve Type: Hopkinsons-Ferranti 28" Parallel slide Stop Valve (Ref:
Dwg F6977N/38)
Stud Material: SA 193 GR B7 (Part No. 516)
Stud Installation:
(a) The initial tensile stress on installed studs was intended to be 24 KSI.
(b) The original design stress of these studs in the hot and cold position was 24 KSI.
Known Experiences: Studs failures occurred in disc guide and baffle plates in similar valves used.in overseas plant. The failure mechanism postulated was stress corrosion cracking.
Although the failure mechanism of the studs removed from the D.C. Cook Unit 2 valve was not definitely determined, metallurgical examination revealed the cracking to be transgranular. AEP postulated that unduly high stresses due to overtightening during original factory installation resulted in these failures as further indicated by the difficulties encountered in stud removal.
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