ML13317A828
| ML13317A828 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/12/1981 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Dietch R Southern California Edison Co |
| References | |
| LSO5-81-12-057, LSO5-81-12-57, NUDOCS 8201210054 | |
| Download: ML13317A828 (2) | |
Text
December 12, 1981 NRC PDR L PDR Docket No. 50-206 TERA LS05-81-12-057 NSIC Mr. R. Dietch, Vice President ORB#5 Rdg 4
'Zf3 Nuclear Engineering and Operations Southern California Edison Company QELD 2244 Walnut Grove Avenue AEOD Post Office Box 800 1E3 Rosemead, California 91770 ACRS10 GVissing
Dear Mr. Dietch:
WPaulson HSmith Gray File We have reviewed your "60 day" response dated November 4, 1981, to our letter dated August 21, 1981, concerning Pressurized Thermal Shock (PTS). Enclosure I to this letter identifies additional -information needed as a result of our review of your response. We request that the additional information identi fied in Enclosure 1 be provided with your "150-day" response to our August 21 letter.
In addition, we have been assessing what infonmation will be provided in the "150-day" responses due in January 1982 and the information expected to be supplied from the PWR Owners' Group.
Since the staff is committed.
to provide its recommendations for further-actions regarding PTS to the Commission in the Spring of 1982, it isi important that your "150-day" response to our August 21 letter provide two significant pieces of informa tion. First, you must provide your basis for continued operation, pending completion of any longer term studies. We emphasize that continued opera tion of your facility, without any immediate modifications to your facility or its operation, will be dependent upon our evaluation of your response.
Secondly, your response should fully address the information addressed in.
We have prepared Enclosure 2 to provide amplification to the "150-day" information request of the August 21, 1981 letter.
The additional information requested by the letter should be provided in.
accordance with 10 CFR 50.54(f) of the Commission's regulations.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under-P.L.96-511.
Sincerely, ORIGINAL SIGNED BY GUS C. LAINAS 8201210054 811212 Gus C. Lainas, Assistant Director 1
8 PDPDR0 for Safety Assessment Division of Licensing G
B:DL
Enclosures:
ORB#5:DL
- 1.
Evaluation of the "60-day"
- s WPaulson*
2 Amplification of "150-day" ORB#4:DL.C-ORB#5:DL QD OFFICEd
.f672 781 CV.............
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0 SURNAME 12/17/81 12/17/81 81 1
8T NRC FORM 318 (10-80) NRCM 0240 OFFICIAL RECORD COPY USGPO: 1981-335-960
-2 (3) Your assessment of the sensitivity of your analyses to uncertainties in input values, such as initial crack size, pper content, fluence, and inital reference temperature at welds.
(4) A list of assumDtions relied upon reaching your conclusions.
- a. If this list includes "crediX' for operator actions, describe the basic instructions given ti operators (for example, if a "sub cooling" band is used, de 7cribe it).
Submit the procedures the operator will follow, aV describe the training being given to establish operator rea iness to cope with PTS events.
- b. If the list include~ credit for the effects of warm prestressing for some event seqyences, include your justification and analyses showing that such/events will follow a pressure-temperature path way for which w'm pre-stress is effective.
The reporting and/or rp ordkeeping requirements of this letter affect fewer than ten respon ents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely, It Gus Lainas, Assistant Director for Safety Assessment.
Division of Licensing Enclosure, Evaluation of 60 Day Response to 8/21/81 NRC 1,tr. on PTS &
Requpst for Additional Inf rmation cc w enclosure:
See (nekt page OFFICE$....1 vi.....*
5 L... A.;PR;QL..
. A.AB WPaulson;cr G#'sing ADCritchfie d TNovak GLainas DATE_ ***. *
....... /.......................
NRC FORM 318 (10-80) NRCM 0240 OFFICIAL RECORD COPY USGPO: 1981-335-960