ML20138H589
| ML20138H589 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/19/1996 |
| From: | Norris J NRC (Affiliation Not Assigned) |
| To: | James Knubel GENERAL PUBLIC UTILITIES CORP. |
| Shared Package | |
| ML20138G356 | List: |
| References | |
| GL-88-20, TAC-M74480, NUDOCS 9701060130 | |
| Download: ML20138H589 (4) | |
Text
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1 UNITED STATES j
NUCLEAR REGULATORY COMMISSION i
2 WASHINGTON. D.C. 30806-0001 i
December 19, 1996 g
e Mr. James Knubel l
Vice President and Director - TMI 4
GPU Nuclear Corporation Post Office Box 480 Middletown, PA 17057-0480 f
l
SUBJECT:
REVIEW OF THREE MILE ISLAND, UNIT 1, INDIVIDUAL-PLANT EXAMINATION
[
SUBMITTAL (TAC NO. M74480)
Dear Mr. Knubel:
I On May 23, 1993, GPU Nuclear submitted the Three Mile Island, Unit 1 (TMI),
l Individual Plant Examination (IPE) submittal in response to Generic Letter 88-20 and associated supplements. On August 3, 1995, the staff sent questions i
to GPU requesting additional information and GPU responded by letter dated December 6, 1995.
5 A " Step 1" review was performed which examined the IPE results for their l
" reasonableness" considering the design and operation of-TMI. The staff i
employed Brookhaven National Laboratory to review the IPE submittal. Their Technical Evaluation Report (TER) is attached as an appendix to the Safety i
Evaluation Report. The TER was reviewed by the IPE Senior Review Board (SRB) j comprf sed of the staff and consultant from Sandia National Laboratory with i
probabilistic risk assessment expertise. The NRC project manager and resident inspector also attended the SRB review meeting.
The IPE has estimated a total core damage frequency (CDF) of 4.2E-05 per reactor year.
Internal flooding, with a CDF of 3E-06 per reactor year, was not included in the total reported above. Transients contributed 60 percent to the total CDF, loss of coolant accidents 38 percent, interfacing system LOCA 2 percent, and steam generator tube rupture 0.4 percent.
GPU defined a front-end vulnerability as any core damage sequence exceeding lE-04 per reactor year. GPU defined a back-end vulnerability as any containment bypass or large early containment failure that exceeds IE-06 per reactor year. Based on these definitions GPU did not identify any i
vulnerabilities.
Plant improvements, however, were identified and credited in the IPE, although they have not yet been implemented.
Even though GPU i
assessed the CDF reductions from these plant improvements to be small, we encourage GPU to make these procedural changes and advise the stiff upon their completion.
NRC HLE CENTER COM osoon
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PDR ADOCK 05000289 P
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N Mr. James Knubel Based on the " Step 1" review, we conclude that GPU has met the intent of Generic Letter 88-20. The staff does not recomend that a " Step 2" review be conducted. Th h concludes our effort regarding Generic Letter 88-20 and, consequent'ty, we are closing TAC No. M74480.
Sincerely, (Original Signed By)
Jan A. Norris, Sr. Project Manager Project Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-289
Enclosure:
Safety Evaluation Report cc w/ enclosure:
See next page Distribution Docket File JNorris PUBLIC EDunnington PDI-2 P1 ant OGC SVarga ACRS JZwolinski PEselgroth, RI JStolz DOCUMENT NAME: G:\\NORRIS\\74480.TMI Ta smeelve a espy of this desegsmas,Indsete in the bes: 'C' s Copy wkhout ettechment/
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l NAME JNdrris)l EDunnington /fn JStolz DATE 12//7 /96 12//7/96 12/A/96 0FFICIAL RECORD COPY i
I
9 Mr. James Knubel 4 Based on the " Step 1" review, we conclude that GPU has met the intent of Generic Letter 88-20. The staff does not recommend that a " Step 2" review be conducted. This concludes our effort regarding Generic Letter 88-20 and, consequently, we are closing TAC No. M74480.
Sincerely, b'
Jan A. Norris, Sr. Project Manager I
LProject Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation y
Docket No. 50-289
Enclosure:
Safety Evaluation Report cc w/ enclosure:
See next page 2
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Three Mile Island Nuclear Station, Unit No. I cc:
Michael Ross Robert B. Borsum Director, O&M, TMI B&W Nuclear Technologies GPU Nuclear Corporation Suite 525 P.O. Box 480 1700 Rockville Pike Middletown, PA 17057 Rockville, MD 20852 John C. Fornicola William Dornsife, Acting Director Director, Planning and Bureau of Radiation Protection Regulatory Affairs Pennsylvania Department of GPU Nuclear Corporation Environmental Resources 100 Interpace Parkway P.O. Box 2063 Parsippany,ilJ 07054 Harrisburg, PA 17??0 Jack S. Wetmore Dr. Judith Johnsrud Manager, TMI Regulatory Affairs National Energy Committee l
GPU Nuclear Corporation Sierra Club P.O. Box 480 433 Orlando Avenue Middletown, PA 17057 State College, PA 16803 Ernest L. Blake, Jr., Esquire Mr. James Knubel, Vice President Shaw, Pittman, Potts & Trowbridge and Director - TMI-l 2300 N Street, NW.
GPU Nuclear Corporation Washington, DC 20037 P.O. Box 128 Forked River, NJ 08731 Chairman Board of County Commissioners of Dauphin County Dauphin County Courthouse Harrisburg, PA 17120 Chairman Board of Supervisors of Londonderry Township R.D. #1, Geyers Church Road Middletown, PA 17057 Michele G. Evans Senior Resident Inspector (TMI-1)
U.S. Nuclear Regulatory Commission P.O. Box 311 Middletown, PA 17057 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406
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