ML20041A262
| ML20041A262 | |
| Person / Time | |
|---|---|
| Issue date: | 01/08/1982 |
| From: | Felton J NRC OFFICE OF ADMINISTRATION (ADM) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20041A261 | List: |
| References | |
| REF-GTECI-A-49, REF-GTECI-RV, TASK-A-49, TASK-OR NUDOCS 8202190342 | |
| Download: ML20041A262 (1) | |
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UNITED STATES 8
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January 8, 1982 MEMORANDUM FOR: Harold R. Denton, Director Office of Nuclear Reactor Regulation FROM:
J. M. Felton, Director Division of Rules and Records Office of Administration
SUBJECT:
INCOMING REQUEST FOR RESPONSES T0 QUESTIONS RE:
EMBRITTLEMENT AT PRESSURE VESSEL WALLS IN BWRs VS. PWRs The subject request is forwarded herewith to your office for preparation of an appropriate response to Mr. J. H. White III's inquiry.
A copy of ovr initial response to Mr. White is enclosed for your information.
Please provide Mr. Frank W. Karas of nly staff with a copy of your reply to Mr. White in order that we can complet,e our file on this matter.
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. Felton, Director ivision of Rules and Records
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Office of Administration
Enclosures:
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January 8, 1982 Mr. Joseph H. White III 11 South Merion Avenue IN RESPONSE REFER Bryn Mawr, PA 19010 TO F01A-82-5
Dear Mr. White:
This is in partial response to your letter dated December 29,1981, in which you requested, pursuant to the Freedom of Information Act, answers to a number of questions concerning embittlement at vessel walls in BWRs.
The Freedom of Information Act (5 U.S.C. 552) applies only to requests for, or access to, records.
Since your request is for information rather than access to records, it is not a proper request made pursuant to the Freedom of Information Act. We have referred your letter to the NRC office responsible for the subject area in which you have expressed an interest in obtaining answers to your questions. We have requested that they respond separately to your request.
Sinc ely, k
J. M. Felton, Director Division of Rules and Records Office of Administration l
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.A December 22; 1981 Mr. Marvin I. Lewis 6504 Bradford Terrace Philadelphia, Pennsylvania 19149
Dear Mr. Lewis:
Your cards dated December 2,1981 to Harold Denton and December 4,1981 to Roy Woods regarding the pressurized themal shock (PTS) issue have been referred to me for response. You requested copies of your original letter (which was accepted as a petition for rulenaking) and.of the Federal Reaister notice regarding that petition. Copies are enclosed.
You also requested that we explain why "the HRC believes PTS is not a problem in boiling water reactors" (BWRs), and you wanted to know if any of the foreign PTS experience involved.BilRs.
We do not belie ~.e FTS is a' problem at BWRs because: fluence.at the vessel inner wall is icwer for nest BtfRs due to presence of the jet pumps (i.e., nore water is between the fuel region and the vessel); BWR vessels are thinner (due to the lower operating pressure, they are.
approxinately 6" thick Ys'. approximately 8" thick for PRRs) and th{s results in lower themal stresses by the approximate ratio (6"/8") =0.56; BWRs are more difficult to repressurize, due to valve setpoints (approxi-nately 1200 psig vs. approximately 2300 psig for RIRs), due to the larger void volune nomally present, and due to their nomal operation at saturation ccnditions; and finally operating experience does not show a history of significant PTS events at Bims (at dcnestic or foreign plants). For exanple, the plants centioned in the "Inside NRC" ' article you referenced (September 21,1981) are all RiRs. A few older, non-jet-punp BURS may experience a substantial degree of embrittlenent toward end-of-life.
Mcnever, for the reasons stated above, we do not expect PTS to be a significant problen for.those plants.
If you reauire further infomation, please do not hesitate.to contcct us.
I night suggest that a nore efficient way for you to obtain nore inforcation than is possible in a brief response such as this, would be for you 'to call the Task I'anager for this issue, Dr. Roy Uoods at (301) 492-4714.
He will be happy to talk to you.
DISTRIBUTION Central r11es (A-49-)
J. Butts J. Kramer-N. Anderschincerely, R. Mattson GIB Reading C. Twigg P. Check '
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S. Hanauer S. Cavanaugh (NRR-81-502)
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,_N. Anderson Division of Safety Technology
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