ML20133D176
| ML20133D176 | |
| Person / Time | |
|---|---|
| Site: | Paducah Gaseous Diffusion Plant |
| Issue date: | 12/31/1996 |
| From: | Wooley R UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | Pierson R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| GDP-96-0206, GDP-96-206, NUDOCS 9701090040 | |
| Download: ML20133D176 (8) | |
Text
70-700/
United Stalet Ennchment Corporation
~
2 Democracy Center 6903 Rockledge Dnva Bethesda. MD 20817 Tel (301)S64-3200 Fax: (301) 564-3201 l'niteil Slales Enricionent Corp > ration December 31,1996 Mr. Robert C. Pierson SERIAL: GDP 96-0206 Chief, Special Projects Branch Division of Fuel Cycle Safety and Safeguards, NMSS United States Nuclear Regulatory Commission Washington, D.C. 20555-0001 Paducah Gaseous Diffusion Plant (PGDP)
Docket Nos. 70-7001 Compliance Plan issue 3, Action 9, ASME Code Interpretation and Assessment Results
Dear Mr. Pierson:
The Plan for Achieving Compliance with NRC Regulations at the Paducah Gaseous Diffusion Plant (Compliance Plan) Issue 3, Action 9, requires, in part, that a code interpretation from the ASME Code Committee be obtained regarding the C-360 parent-daughter transfer system and the need for pressure relief on the transfer manifold. Based on this interpretation, the need for modifications to the system or operations would be assessed. In addition, this Compliance Plan Action requires both the code interpretation and the assessment results to be submitted to NRC for review and approval.
In accordance with Compliance Plan issue 3, Action 9, a code interpretation has been requested and a response received from the ASME Boiler and Pressure Vessel Committee.
This code interpretation, including the background information, was prepared in accordance with Section Vill, Division 1, Appendix 16, Paragraph 16-5 of the Code. Both the request and the ASME response are provided in Enclosure 1.
The assessment of the code interpretation is provided in Enclosure 2 (Engineering Notice C-EN-814-96-061, Revision 1).
As noted in the engineering assessment (Enclosure 2), the initial response from the ASME Secretary fbr the Subcommittee on Pressure Vessels (Enclosure 1), indicates that the requirements of ASME Code, Division 1, Section Vill, Paragraph UG-125(a) would appear to be invocable to the parent-daughter transfer operation, which would appear to require pressure relief protection on the transfer manifbid. Ilowever, based on the technical justification contained in the engineering assessment, PGDP engineering has concluded that no modification to the system or system operation associated with the parent-daughter transfer operation is required.
Since an ASME code interpretation was obtained and assessed as required by Issue 3, Action 9, this Compliance Plan issue is considered to be complete. The administrative procedures, the four independent controls on the source of heat and the two sets of doubly redundant steam cutoffsf/F/y) described in the Justification for Continued Operation associated with issue 3, Action 9, will remain f
in effect.
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M) 9701090040 961231
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Mr. Robert C. Pierson December 31,1996 GDP 96-0206 Page 2 J
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There are no new commitments contained in this submittal. Should you have any questions or require additional infomtation, please contact me at (301) 564-3413 or Mark Smith at (301) 564-3244.
Sincerely, Robert L. Woolley Nuclear Regulatory Assurance and Policy Manager Enclosures cc:
NRC Region Ill Omce NRC Resident inspector - PGDP NRC Resident Inspector - PORTS DOE Regulatory Oversight Manager
Mr. Robert C. Pierson December 31,1996 GDP 96-0206 Page 3 Distribution:
Robert L. Woolley Reader File bec:
J. Adkins, IlQ R. Gaston, PORTS W. Sykes, PGDP R. Wells, IIQ M. Smith, llQ M. Lombard, llQ S. Routh, IlQ D. Scott, liq J. Dietrich, LMUS D. Silverman, ML&B A. Rebeck-Main, llQ h:\\nraVetters.nrc\\gdp96.206 Concurrence line CRS / /96
. to GDP 96-0206 Page 1 of 3 ASME Code Interpretation Request and Response l
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ID:!RA FAX:5024416798 PAGE 3
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.L theed Mdia Utility Services. inc P.O. Boa 14to Paducab. Keetucky 4200214to A
LeCKNEED nV A R Y I N July 22,1996 i
Secretary ASME Boiler and Pressure Vesse! Coramittee 345 East 47th Street New York, New York 10017
Dear Sirs:
Dackground: As a chemical plant processor we transfer chemicals from one cylinder to another. Both cylinders, the parent cylinder and the receiver cylinder, are ASME Section Vi!! U. stamped pressure vessels. To facilitate the transfer the partner cylinder is placed in an autoclave and heated with steam.
The autoclave is also a Section Vill U. stamped pressure vessel with properly sized ASME certified relief valves installed.
Question: Since the parent cylinder is fully enclosed and contained in the autoclave, do the requirements of UG 125 apply to the parent cylinder?
Reply: No.
Sincerely, Doyle arriner Design Engineer DJW:stw l
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l
12/20 '96 17:23 ID:tRA FAX:5024416798 PAGE 5
Codes and Stendeeds ASMEInternational l
212705-8500 l
212 705 8501 345 East 47m Siteet l
Now York,NY 1001T 2392 U.S A.
November 5, 1996 Mr. Doyle Warriner Lockheed Martin Utility Services, Inc.
P.O. Box 1410 Paducah, KY 42002-1410 Subj:
UG-125;Section VIII, Division 1 Ref:
Your letter of 7/22/96
Dear Mr. Warriner:
Your letter appears to request an interpretation of the requirements of Section VIII, Division 1. As stated in your letter, you have three ASME Code symbol stamped pressure vessels. That being the case, it would appear that the requirements of UG-125(a) in Section VIII, Division 1 are invocable.
If you have any further questions please advise.
Sincerely, M
Alan Roby Secretary; SC on ressure Vessels (212) 705-8538 FAX (212) 705-8501 The American Society of Mechanical Engineers
i
- to GDP 96-0206 Page 1 of 2 Assessnient of ASNIE Code Interpretation Engineering Notice C-EN-814-96-061 llevision i
12/31 '96 10:56 ID#A FAX:5024416798 PAGE 2
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Uranium Enrichment Pacilltfee Lockheed Mortin unley savices,Inc.
ENGINEERING NOTICE j
sneet t of t.
(Attech Adostonal Sheets se riscoseary) l Facmes: C 360 C. EN. (14.,99
.QiL, Rev 1 rwn o=e,=
v.a ec.new Reseen for EN: To Document the engineedng eseeeement of the ASME enewer to the inquiry on resef protection for squi I
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tronefer cyonders (Comp 6ence Plan luue No. 3, Acdon item 9)
Refwence(s). Letter o' Inquiry dated July 22,1996; Reeponse letter from ASME dated Nov. 5,1996 Subject Relef protecton for trenefer evindere in the C-300 Autoclas _
Effective Detee:
_12/30/96 to _
l Desertpeon-C 360 le the Toll Trenefer faci:ity et PGDP, As such, UF,le some6mes treneferred from one cyfinder to another, tNo trene eccompuched while meintaining the UF,in e Iquid state. Part of the trenefer process requires the parent cytoder of UF,to be d
heated without being connected to e pressure redef system. To secerteln if thle le ecceptable from a pressure vessel code J
comp 6ence etendpoint, Engineering sent en Inquiry to the Anerleen society of Mechanical Engineers (ASME) statng the conditione o the trenefer and asking If tNo was en acceptable conAgurehn. The response received from the ASME stated r
the requiremente of UG 125 (e)In Section Vill were invocable. In other words, the trenefer process must tm performed while i
suuring a pressure relief conngurehn be ovelleble to meet the ASME Code, Secton Vlli, Division 1, VG 125 requirements.
Enginetting Responee:
AAer receMng the inponse from ASME, Engineering contacted the ASME for further uplaneson. The ASME stated that if we 1
j could provide thorn with rnore background informahn they could recone dor the inquiry, The background Informaton that needs to be supplied le es fotowe-
- 1. Autoclave steem preuvre ;e contro5ed to less then 5 pelg Five pelg setureted steem produces a temperature of 226*F, At equilibrium, this temperature produces e cyinder precours of approWmetely 67 pelg.
l
- 2. Automsk controle shut off steem flow to the autoclave using a pressure controlvnNe when autoclave pressure reaches 8 l
pelg. Eight pelg estuteted steem produces e temperature of 235'F. At equilibrium, tNo tempweture produces e cytInder prescure of apptoximately 75 peig.
- 3. When the pressure Inalde the autoclave reachee 15 pelg, the steem kw le automatice#y stopped when the autoclave le l
placed into contolomontisolation. Flfteen peig esturated steem produces e temperature of 250'F, At equilibr(um, this i
temperature produces e cytnder preneure of appro4metely 45 poig.
2
- 4. In the highh unkkey event of a complete control feaure, go pelg steem would be Introduced into the autoclave Ninety pelg estursted steem produces e temperature of 331'F. At equilibrium, which would requ!re a euetained exposure etl i
this stearn pressure wtth no operstor Intervenkn, th!s temperature produces e cytinder pressure of approximately 207
{
Polg.
I The cytndere used ere designed for 200 pelg and are tested according to ANSI N14.1 to 200% of MAWP(400 pelg) overy 5 i
years a
Based on the technical justmcation provided ebove, PGDP Engineering concludes that e modmcekn le not needed in spite of the Input ioceNed from ASME.
Roeponsible Engineenng Designer g,@
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