ML19340C530
| ML19340C530 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/06/1980 |
| From: | Jay Collins, Conte R, Fasano A Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| PNO-TMI-80-049, PNO-TMI-80-49, NUDOCS 8011170788 | |
| Download: ML19340C530 (2) | |
Text
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PRELIMINARY tiOTIFICATION November 6, 1980 0RELi'41 NARY NOTIFICATION OF. EVENT OR UNUSUAL OCCURRENCE--PNO-TMI-80-49
[
Jhis preliminary notification constitutues EARLY notice of events of POSSIBLE safety or public interest sianificance.
The information presented is as initially received 4
without verificatioE a evaluation and is basically all that is known by NRC staff i
on this date.
Facility: Metropolitan Edison Company Three Mile Island, Unit 2 Middletown, Pennsylvania Docket Number 50-320
Subject:
LOSS OF DECAY HEAT TO REACTOR BU,ILDING AMBIENT TEST At 9:00 a.m. today the licensee commenced the Loss to Ambient Test (Loss of Reactor Occay Heat to Reactor Building Ambient Test).
This test was initiated to demonstrate that sufficient heat transfer occurs from the reactor coolant system to the reactor 2
building ambient (air and sump water) to adequately cool the reactor core.
This test rerlects a change in the past reactor cooling mode since the March 28
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accident.
Prior to the test steaming occurred under vacuum in the "A" once through steam generator (OTSG) with the "B" 0TSG isolated.
The test condition now requires both OTSG's to be isolated.
1 j
The test is conducted in accordance with a procedure (with associated safety evaluation) 5 approved by the onsite NRC staff.
The test will be terminated if:
The average incore thermocouple temperature exceeds 150 F or increases more than 10 F in one hour.
Any incore thermocouples and hot leg temperature exceeds 200 F.
The hot leg temperature for either OTSG increase more than 10 F in one hour.
Equipment necessary to reestablish steaning on the "A" 0TSG will remain operable I
throughout the test.
l The test is planned to. last 15 days.
At that time the licensee will evaluate gathered data and recommend to the onsite NRC staff on whethe-or not to continue the test.
Media interest has been expected because the licensee plans to issue a press release.
The Commonwealth of Pennsylvania has been informed.
The NRC has not made plans to issue a press release.
l This preliminary notification is issued for information only and no further action by the NRC is anticipated.-
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Pfl0-TMI-80-49 (cont) 2 thvember 6,1980 The NRC TMI Program Office receiwd notification of this occurrence by monitoring licensee events as they occur, and this nformation was current as of 10:00 a m.
590-1123}J.T. Collins ((?$'&
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Contact:
R. J. _onte 590-112_5 A. N._Fa,sano 59 -1121 Dis tri but_ ion:
(Facsimile Transmission Times Noted)
H St Bldg
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Chairman Ahearne Commissioner Bradford S. J. Chilk, SECY Commissioner Gilinsky Commissioner Hendrie C. C. Kammerer, CA ACRS (For Distribution)
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P. B1dg //*/0 IE:X005lojff(IE:HQDist.)
W. J. Dircks, E H. R. Denton, NRR C. Michelson, AEDO D. Ross, NRR J. J. Fouchard, PA R. J. Mattson, NRR Landow Bldg (Fax _by HQ)
H. M. Haller, MPA S. Hanauer, NRR (6 min /page)
W. Kerr, OSP D. Eisenhut, NRR J. J. Cummings, 01A H. K. Shaper, ELD R. H. Vollmer, NRR B. J. Snyder, NRR (MAIL) egion I
//.'d R. Minogue, SD Region II _// /
WillsteBldgff.*0N IE:X005 Region 111 ] /.*
J. G. Davi s, NMTS ~
)DocumentManagementBr Region IV J M _
R. Budnitz, RES
( (For POR/LPDR)
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