ML19343D563
| ML19343D563 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 04/27/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Lewis M AFFILIATION NOT ASSIGNED |
| References | |
| NUDOCS 8105050236 | |
| Download: ML19343D563 (3) | |
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APR 2 7 19 81 Marvin I. Lewis
'e 6504 Bradford Terrace Qf Philadelphia, PA 19149 (2
Dear Mr. Lewis:
Thank you for your latest letter of April 2,1981.
Responses to your five questions are given below:
Question 1 - Are you specifically going to investigate the vibration or shaking of uncured concrete due to the blasting at the nearby quarry? If indicated, will further investigation be started? For instance, if the blasting occurred during the curing of the Class I structures, will vibration be estimated? If indicated, will cores be cut out and compression tested? Will ACI rules be followed or some other concrete guide?
Answer - We plan to investigate possible effects of the vibration of uncured concmte resulting from blasting at the Pottstown Traprock Quarry. The nature of the follow-up to this investigation will depend upon what we learn. If blasting occurred during the curing of Class I structures, the peak velocity at that structure will be estimated.
Question 2 - You state that, "The staff is requesting the PEco to pro-vide a record of blastings and concrete pours for Class I structures."
Was this requested in writing? May I have a copy of the letter? If by phone, when? I know that the PECo was requested to " correlate the data (blasting and pours) so that more precise infonnation will be avail-able to assist in an analysis." Where was this particular correlation mquested? Can I see it when available?
Answer - PECo was alerted to the need for the correlation during tele-I phone calls on March 6, and March 20, 1981. A Fortnal Request for Addi-tional Infonnation on this subject is currently being processed. You i
may see it when it becomes available at the Local Public Document Room (EPDR), Library, Pottstown.
Ouestian 0 - Is investigation of Class I structures sufficient in light of the many non-ESF structures that were involved in the mitigation of the TMI 2 scenario? Will a study be done on this question? When and where can I see it?
Answer - We decided to limit the investigation to Class I structures first.
If it appears justified, then, it will be extended to other structures.
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i Question 4 - Question D answer, "The extent to which this (Lewis Report incorporated into PRA) is adequately accomplished will be studied in the staff review of the final report." Aren't there any guide 10es for the way that the staff will accomplish the staff review of the PRA? ItadE d to be a pure staff decision according to your answer.
If there are guide-lines, where can I get a copy of NUREG #?
Answer - PECo was requestdd (letter Eisenhut to Bauer, dated May 6,19801 to gTlize the WASH-1400 methodology in the PRA and to specifically recognize the criticisms of the Risk Assessment Review Group Report. These items poovide the guidelines to PECo and the staff concerning the content of the PRA.
In addition, we held a detailed meeting on the PRA on May 21, 1980 i
~(sumarized in memo D. Sells to A. Schwencer of May 23,1980), and I sent
.another Re' questlfor Additional Information to PEco on January 26, 1981.
PECo specifically addresses the Lewis Comittee's coments in Section 1.3.2 1
of the PRA. We are in the prmcess now of conducting an acceptance review of the PRA to determine whether it contains the required material. Any i
missing material will have to be supplied by PECo before the technical myiew. All of the documents referenced above as well as the PRA are avail-able at the LPDR.
j Question 5 - Answer to question E.
"The exact extent of coverage (Class 9 accidents) will not be known until we receive the final report (PRA) from PECo." This sounds like PEco (Licensee) is in charge of specifying how extensive the Class 9 consideration will be W the PRA.
Is this correct?
i
'If.n t, are there any guidelines for the PECo to use? May I see them?
o Where? Can I get a copy? NUREG #7 Answer - The Limetick PRA uses four generic accident classes for analysis.
It is recomended that you study the whole document (availaole at LPDR).
However, Table 3.3.1. enclosed, from the PRA sumariles the cases.
I trust you will find the above answers responsive to your questions.
DISTRIBUTION Sincerely, NRC PDR { M erCentral File;
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Table 3.3.1 1
GENERIC ACC' DENT SEQ'JENCE CLASSES 4
Pnysical basis System tevel Contributtag Generic Accieent Sequeme Designator for Classification Event Seewence Class ! (C1)
Relatively fast coeg meltI Transteats involving loss of inve=tery maten, contairment intact at core small LOCA events involutag less of inventary melt and at los pressure maneus Class !! (C2)
Relatively sloe core melt franstents or LOCAs involving loss of due to louer eecay heet heat removal. taedvertent Say coentag pe=ert containment Tesied accidents vita ineesquete heet removal prior to care ne's capactitty Class !!! (C3) nelatively fast core melt, Transients involving loss of scram function containment intact at and inability to provide coolant meteup.
tth insufficient coola c, ore wit,but et higm large LOCAs.=.h,_.f h t _..nt matevo n.._,. s_.
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term less of inventory esteve Trans,.f ents involv.ing loss of scram function, Class IT (C4)
Reistively fast, core.meltt
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core melt eue to over-reactivity control, but watch have coolant pressure '
meteup capettitty
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